Canon PC940 Service Manual

Canon PC940 Manual

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  • Canon PC940 | Service Manual - Page 1
    PC880 F13-8291 PC890 F13-8242 PC920 F13-8431 F13-8441 F13-8461 PC921 F13-8432 TYA00001- TZA00001- UAA00001- TVB00001PUD00001PUE00001PUH00001- TVC00001- PC940 F13-8436 PC941 F13-8437 PC950 F13-8231 F13-8241 PC960 F13-8434 PC980 F13-8232 PC981 F13-8233 TVD00001- TVE00001- TVF00001PUF00001PUG00001
  • Canon PC940 | Service Manual - Page 2
    SHOULD BE DIRECTED TO THE COPIER SERVICE DEPARTMENT OF THE SALES COMPANY. THIS DOCUMENTATION IS INTENDED FOR ALL SALES AREAS, AND MAY CONTAIN INFORMATION NOT APPLICABLE TO CERTAIN AREAS. COPYRIGHT © 1999 CANON INC. Printed in Japan Imprimé au Japon Use of this manual should be strictly supervised
  • Canon PC940 | Service Manual - Page 3
    . This service manual consists of the following chapters: Chapter 1 General Description introduces the machine's features, specifications, names of parts, and how originals are reproduced. Chapter 2 Basic Operation explains how copies are made on a step-by-step basis. Chapter 3 Exposure System
  • Canon PC940 | Service Manual - Page 4
    form of Service Information bulletins. All service persons are expected to have a good understanding of the contents of this Service Manual and all relevant Service Information bulletins and be able to identify and isolate faults in the machine. ii COPYRIGHT © 1999 CANON INC. CANON PC800s/900s
  • Canon PC940 | Service Manual - Page 5
    • This service manual covers the models shown in the following table. Be sure to have a good understanding of the difference from model to model before referring to this manual. Model PC860 PC880 PC890 PC920 PC920 PC920 PC920 PC921 PC940 PC941 PC950 PC950 PC950 PC960 PC980 PC981 Type code TYA TZA
  • Canon PC940 | Service Manual - Page 6
    iv COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 7
    Drive System 3-3 D. Scanner Drive System ..........3-4 II. EXPOSURE SYSTEM 3-9 A. Controlling the Scanning Lamp 3-9 III. DISASSEMBLY/ASSEMBLY ..... 3-12 A. Scanner Drive Assembly .... 3-13 B. Lens Drive Assembly ......... 3-31 C. Exposure System 3-37 COPYRIGHT © 1999 CANON INC. CANON PC800s
  • Canon PC940 | Service Manual - Page 8
    /ASSEMBLY ..... 4-22 A. Cartridge 4-23 B. Transfer Charging Assembly 4-25 C. Blank Exposure 4-26 CHAPTER 5 PICK-UP/FEEDING SYSTEM I. PICKUP/FEEDING SYSTEM.......5-1 A. Outline 5-1 B. Controlling the Pickup Roller 5-3 C. Controlling the Movement of Paper 5-9 D. Detecting Jams 5-12 II
  • Canon PC940 | Service Manual - Page 9
    B. Placing Copy Paper 9-9 III. MOVING THE MACHINE .......... 9-12 CHAPTER 10 MAINTENANCE AND SERVICING I. PERIODICALLY REPLACED PARTS 10-1 II. DURABLES AND CONSUMABLES 10-1 III. SCHEDULED SERVICING ....... 10-1 IV. STORING AND HANDLING THE CARTRIDGE 10-2 A. Storing the Cartridge with the
  • Canon PC940 | Service Manual - Page 10
    MALFUNCTIONS 11-61 A. Troubleshooting Malfunctions 11-61 V. TROUBLESHOOTING FEEDING PROBLEMS 11-75 A. Copy Paper Jam 11-75 B. Faulty Feeding 11-78 VI. ARRANGEMENT AND FUNCTIONS OF ELECTRICAL PARTS 11-79 A. Sensors and Solenoids .... 11-79 B. Switches 11-80 C. Lamp, Heater, Motor, Etc
  • Canon PC940 | Service Manual - Page 11
    1 GENERAL DESCRIPTION This chapter provides specifications of the machine, instructions on how to operate the machine, and an outline of copying process. I. FEATURES 1-1 II. SPECIFICATIONS 1-2 A. Copier 1-2 B. ADF 1-8 III. NAMES OF PARTS 1-10 A. External View 1-10 B. Cross Section 1-13 IV
  • Canon PC940 | Service Manual - Page 12
  • Canon PC940 | Service Manual - Page 13
    Maintenance • The photosensitive drum, toner case, charging roller, developing assembly, and cleaning assembly are constructed as a single entity (cartridge). The user may expect quality copy images at all times as long as he/she performs simple replacement/cleaning work. 6. Large Paper Source • The
  • Canon PC940 | Service Manual - Page 14
    medium 2. Mechanisms Item Reproduction Charging Exposure Copy density adjustment Development Pickup Separation Fixing Cleaning Original orientation Desk top Descriptions Fixed Halogen lamp (80 V/110 W for 120V-model; 150 V/160 W for 220/240 V-model) Fixed focal point lens OPC drum (24-mm dia
  • Canon PC940 | Service Manual - Page 15
    1 GENERAL DESCRIPTION 3. Performance Item Original type Maximum original size Reproduction ratio Zoom Wait time First copy time Continuous copying Copy size Copy paper type Cassette Multifeeder tray Copy tray Non-image width Auto power-off COPYRIGHT © 1999 CANON INC. Descriptions Sheet, book
  • Canon PC940 | Service Manual - Page 16
    . *4. Upon delivery, be sure to remove each from the copy tray. *5. Be sure to remove any curling before feeding for a second time. *6. If stopped because paper ran out during copying operation, 1 hr. 1-4 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU
  • Canon PC940 | Service Manual - Page 17
    Item Operating condition Temperature Humidity Atmospheric pressure Power source Descriptions 7.5°C to 32.5°C/44.5°F to 90.5°F 5% to 85% RH 607.95 to 1013.25 hPa (0.6 to 1 atm) 120 V 60 Hz 220/240 V 50 Hz, 60 Hz Serial number lb*2 Copy paper: Keep wrapped, and protect against humidity. Toner: Avoid
  • Canon PC940 | Service Manual - Page 18
    5. Default Ratios Item Direct Reduce I Reduce II Reduce III Reduce IV Enlarge I Enlarge II 2R2E (Inch/AB-configuration) 1:1.000 1:0.707 1:0816 1:1.154 1:1.414 Table 1-205 3R1E (Inch-configuration) 1:1.000 1:0.707 1:0.786 1:0.860 1:1.414 1-6 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV
  • Canon PC940 | Service Manual - Page 19
    10 (9) 9 Table 1-206 *1. The number of copies starting with the pickup operation that follows the delivery of the 19th copy in a continuous copying job. (See p.5-8) The specifications are subject to change for product improvement. COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999
  • Canon PC940 | Service Manual - Page 20
    sheets (80 g/m2 or less; about 3 mm in height) Single-sided original to single-sided copy Yes (in feeding direction) No Yes 446 mm/sec IPC Width: 474 mm/ 18.7 in. (659 mm/ as the host Table 1-207 1-8 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 21
    staple, clip, or glue. • Sheet with a cut, hole, or tear. • Sheet with holes for binding. • Sheet with a carbon back. • Sheet with a cut-and-paste piece. • Sheet with curling, bending, or wrinkling. The specifications are subject to change for product improvement. COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 22
    [3] Manual feed tray [4] Right door [5] Cassette [6] Copyboard glass Figure 1-301 [4] [3] [5] [2] [1] [6] [1] Copy tray [2] Power cord connector [3] Open/close lever [4] Static eliminator [5] Copy density correction switch [6] Delivery guide plate Figure 1-302 1-10 COPYRIGHT © 1999 CANON INC
  • Canon PC940 | Service Manual - Page 23
    ADF Type [5] CHAPTER 1 GENERAL DESCRIPTION [1] [2] [4] [1] ADF [2] Manual feed tray [3] Right door [5] [3] [4] Cassette [5] Copyboard glass Figure 1-303 [6] [4] [7] [3] [2] [1] [1] Static eliminator cleaner [2] Delivery guide plate [3] Copy tray [4] Power cord connector [5] Open/close lever
  • Canon PC940 | Service Manual - Page 24
    CHAPTER 1 GENERAL DESCRIPTION 3. ADF [3] [4] [2] [1] [1] Original tray [2] Original delivery tray [3] Slide guide [4] Auxiliary tray Figure 1-305 1-12 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 25
    cylinder [20] Photosensitive drum [21] Transfer roller [22] Feed belt [23] Cassette [24] Fixing upper unit [25] Fixing lower roller [26] Cleaning roller [27] Delivery roller [28] Copy tray [29] Single-feeder pickup roller Figure 1-306 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG
  • Canon PC940 | Service Manual - Page 26
    [5] Copyboard tray [6] Auxiliary tray [7] Guide plate [12] [11] [10] [9] [8] [7] [8] Separation pad [9] Registration roller [10] Feed belt drive roller [11] Feed belt [12] Feed belt roller [13] Feed belt link slave roller Figure 1-307 1-14 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG
  • Canon PC940 | Service Manual - Page 27
    mode. Indicates the selected default ratio. Indicates the selected cassette/ manual feed tray.If there is no paper loaded, it flashes. Flashes in response to a jam. • Indicates the number of copies or reproduction ratio. • The symbol "%" turns on when indicating a ratio. 100 (max.; continuous
  • Canon PC940 | Service Manual - Page 28
    10 Count/zoom set key 11 Zoom indicator*2 12 Zoom key*2 13 Paper selection key*1 Description Sets the number of copies or a zoom ratio. Turns on when zoom mode is selected. Selects/deselects zoom mode. Selects the cassette/ manual feed tray. Remarks May be between 70% and 141% in 1% increments
  • Canon PC940 | Service Manual - Page 29
    MAINTENANCE BY THE USER Instruct the user to clean the following if images tend to be soiled or copy paper tends to jam often. 1. Soiled Images a. Copyboard Glass/Copyboard Cover Clean the cover with a moist cloth (with water or mild detergent solution); then, dry wipe it. b. Feeding Belt (ADF type
  • Canon PC940 | Service Manual - Page 30
    arrow in the figure; then, dry wipe it. Figure 1-502 2. If Jams Occur Frequently a. Static Eliminator 1) Remove the static eliminator cleaner from the machine. Figure 1-503 (Copyboard type) 1-18 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 31
    cleaner, clean the static eliminator. • Brush out the paper lint or the like from the groove of the static eliminator. Figure 1-505 4) Close the machine as soon as you have finished cleaning. (Work briskly.) COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME
  • Canon PC940 | Service Manual - Page 32
    focal point lens Side blanking lamp (front, rear) Primary charging roller Developing blade Fixing assembly Cleaning blade Developing cylinder Photosensitive drum Figure 1-601 Transfer charging roller Static eliminator 1-20 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999
  • Canon PC940 | Service Manual - Page 33
    block 1. Primary charging 2. Image exposure 7. Drum cleaning 3. Development Delivery 6. Fixing 4. Transfer Manual feed 5. Separation Registration : Flow of copy paper Cassette : Rotation of the photosensitive drum Figure 1-602 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG
  • Canon PC940 | Service Manual - Page 34
  • Canon PC940 | Service Manual - Page 35
    operation, relationships between electrical and mechanical systems, and timing at which each associated part is turned on. Process speed 96 mm E. Inputs to and Outputs from the DC Controller 2-7 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 36
  • Canon PC940 | Service Manual - Page 37
    Image formation system Drum cleaning block Photosensitive drum Developing assembly Copy tray Feeding Fixing assembly/ delivery assembly Transfer/ separation Cassette Figure 2-101 Pickup control block Manual feed block Pickup/ feeding system COPYRIGHT © 1999 CANON INC. CANON PC800s/900s
  • Canon PC940 | Service Manual - Page 38
    2 BASIC OPERATION B. Outline of Electrical Circuitry The machine's major electric mechanisms are controlled by the microprocessor mounted on the DC controller PCB, which reads input signals from sensors and operating keys according to the instructions of the program stored in advance and sends
  • Canon PC940 | Service Manual - Page 39
    , 2 Copies, Continuous, Cassette Power switch Copy Start key ON ON STBY INTR AER SCFW SCRV SCFW SCRV LSTR STBY Main motor (M1) Scanning lamp (LA1) : Lens home position detection Figure 2-103 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 40
    SCRV ends to when the main motor stops. Moves the scanner to the home position in preparation for the next copying run. Neutralizes the drum surface potential as post-processing. Table 2-101 2-4 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 41
    Figure 2-104 is a block diagram of the circuit. Item Power supply Description 24 VDC from parts Photosensitive drum, primary charging roller, developing assembly, transfer charging roller, pickup roller, vertical roller, registration roller, feeding CANON INC. CANON PC800s/900s REV.0 AUG. 1999
  • Canon PC940 | Service Manual - Page 42
    the MLOCK signal goes '1'. Related Error Code E010 While the main motor drive signal is generated, the rotation of the main motor deviates from a specific number for 1 sec or more. in the display. 2-6 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 43
    paper, '1'. (The light-blocking plate is at PS751, '0'.) When the surface temperature of the fixing heater increases, the voltage decreases. (analog signal) When the temperature of the scanner increases, the voltage decreases. (analog signal) Figure 2-105 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 44
    in the control panel PCB, and the DC controller turns on or flashes the LEDs and reads key inputs. SW309 J62 J102-2 DIG1 -3 HEAT0 -4 DIG1 -5 HEAT1 The variation in the signals. Figure 2-106 2-8 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 45
    Thermal fuse 2 Scanning lamp FU1 LA1 Thermal fuse 1 J910-3 -1 Transformer Fixing heater activation circuit Scanning lamp activation circuit J104-2 HEAT_TRG drive motor Figure 2-107 See p. 3-7. COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 46
    solenoid turns on. When '0', the scanner cooling fan turns on. Side blanking lamp (rear) J106-1 SB_LP* When '0', the blanking lamp turns on. Side blanking lamp (front) +24V -2 Figure 2-108 2-10 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 47
    -3 -2 -1 +24V +5V +5V +24V J202-1 -2 -3 -4 -5 -6 Composite power supply PCB J114-1 REQ -2 -3 ACK -4 -5 TXD -6 -7 RXD -8 J105-6 -5 -4 -3 -2 -1 DC controller PCB See Chapter 8. Figure 2-109 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 2-11
  • Canon PC940 | Service Manual - Page 48
  • Canon PC940 | Service Manual - Page 49
    Drive System 3-3 D. Scanner Drive System ..........3-4 II. EXPOSURE SYSTEM 3-9 A. Controlling the Scanning Lamp 3-9 III. DISASSEMBLY/ASSEMBLY ..... 3-12 A. Scanner Drive Assembly .... 3-13 B. Lens Drive Assembly ......... 3-31 C. Exposure System 3-37 COPYRIGHT © 1999 CANON INC. CANON PC800s
  • Canon PC940 | Service Manual - Page 50
  • Canon PC940 | Service Manual - Page 51
    functions of the exposure system. Item Lamp Scanning Scanner lamp) • Thermal fuse (FU1; blows at 128°C) Table 3-101 Copyboard glass Enlarge Reduce Moves for enlargement/ reduction Fixed focal point lens Photosensitive drum No. 4/5 mirror unit COPYRIGHT © 1999 CANON INC. Figure 3-101 CANON
  • Canon PC940 | Service Manual - Page 52
    3 EXPOSURE SYSTEM B. Varying the Reproduction Ratio The reproduction ratio in the drum axial direction (main scanning direction) is varied by the lens drive system, and that in the drum peripheral direction (sub scanning direction) is changed by the scanner drive system. In the lens drive system
  • Canon PC940 | Service Manual - Page 53
    CHAPTER 3 EXPOSURE SYSTEM C. Lens Drive System 1. Outline The lens drive system is driven by the scanner/lens drive ) Lens unit Lens shift detecting shaft for side blanking lamp DC controller PCB Figure 3-103 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (
  • Canon PC940 | Service Manual - Page 54
    3 EXPOSURE SYSTEM D. Scanner Drive System 1. Outline The scanner is driven by the scanner/lens drive motor (M2), whose direction of rotation changes to according to the length of copy paper and the selected reproduction ratio. The scanner/lens drive motor dives the lens drive system as well as the
  • Canon PC940 | Service Manual - Page 55
    3 EXPOSURE SYSTEM 2. Copy Start key ON ON STBY INTR SCFW SCRV SCFW SCRV LSTR STBY Scanner home position sensor (PS1) Pre-registration roller paper sensor (Q751) Scanner I II I Scanning lamp © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-5
  • Canon PC940 | Service Manual - Page 56
    EXPOSURE SYSTEM 4. Controlling the Copying Speed The machine uses a halogen lamp for scanning, and the heat of the lamp copying, it remains on until the end of the copying job. At the end of copying, if the reading 6-cpm copying speed pre-registration roller paper sensor (Q751) time the Copy Start key
  • Canon PC940 | Service Manual - Page 57
    CHAPTER 3 EXPOSURE SYSTEM 5. Controlling the Scanner/Lens Drive Motor a. Outline The scanner/lens drive motor Current switching signal 3 (Q109) Motor driver circuit SC-A SC-A* SC-B SC-B* M2 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-7
  • Canon PC940 | Service Manual - Page 58
    CHAPTER 3 EXPOSURE SYSTEM b. Operations The microprocessor (Q101) mounted on the DC controller PCB receives instructions from the control panel PCB copying mode settings (e.g., once it has blown. 3-8 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 59
    CHAPTER 3 EXPOSURE SYSTEM II. EXPOSURE SYSTEM A. Controlling the Scanning Lamp 1. Outline Figure 3-201 shows the circuit used to control the scanning lamp, and has the following func- tions: • Turning on/off the scanning lamp. • Controlling the intensity of the scanning lamp. • Monitoring the state
  • Canon PC940 | Service Manual - Page 60
    CHAPTER 3 EXPOSURE SYSTEM 2. Operations a. Turning On/Off the Scanning Lamp The DC controller PCB and the composite power supply exchange signals in serial communication to control the scanning lamp. According to the scanner lamp active voltage signal, the microprocessor (Q900) on the composite
  • Canon PC940 | Service Manual - Page 61
    has been detected for 1 sec or more although the scanning lamp activation signal is not sent. If an error has been detected, the power switch will be turned off after indicating an error code for 2 sec. COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU
  • Canon PC940 | Service Manual - Page 62
    EXPOSURE SYSTEM III. DISASSEMBLY/ASSEMBLY As needed, disassemble/assemble the machine with the following in mind: 1. ! Before starting the work, turn off the power switch and disconnect the power plug for safety. 2. Unless otherwise instructed, assemble the parts the machine with any of its part
  • Canon PC940 | Service Manual - Page 63
    Remove the four screws [1], and detach the lens cover [2]. CHAPTER 3 EXPOSURE SYSTEM [1] [1] 4) Disconnect the connector (J110) [3] from the DC controller PCB. [2] Figure 3-301 [3] Figure 3-302 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON
  • Canon PC940 | Service Manual - Page 64
    3 EXPOSURE SYSTEM 5) Open the machine's top unit farther, and hold it in position using the handle (about 30 mm in diameter) of a screwdriver. 6) Remove the machine's two fixing screws [4] from the scanner/lens drive motor [5]. Figure 3-303 [4] [5] [4] Figure 3-304 3-14 COPYRIGHT © 1999 CANON
  • Canon PC940 | Service Manual - Page 65
    7) Free the top unit (by removing the screwdriver), and close the top unit. 8) Remove the E-ring [6]; then, lift the cable drive pulley [7] slightly, and detach the scanner/lens drive motor [5]. CHAPTER 3 EXPOSURE SYSTEM [6] Lift. [5] [7] Figure 3-305 COPYRIGHT © 1999 CANON INC. CANON PC800s/
  • Canon PC940 | Service Manual - Page 66
    CHAPTER 3 EXPOSURE SYSTEM 2. Outline of the Scanner Drive Cable Wind 1.5 times. (black cable) Wind 7.5 times. (silver-colored cable) Figure 3-306 3-16 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 67
    • Adhesive tape 1) Set the mirror positioning tool as shown. CHAPTER 3 EXPOSURE SYSTEM 2) Prepare about five strips of adhesive tape (each one about 20 × 50 PCB. Figure 3-307 [1] Figure 3-308 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-
  • Canon PC940 | Service Manual - Page 68
    CHAPTER 3 EXPOSURE SYSTEM 5) If the machine is equipped with an ADF, free the hook [2], and disconnect the two relay connectors [3] from the left upper stay [4]. [2] [3] [2] [4] 6) Remove the three screws [5], and detach the left upper stay [4]. [2] [2] [3] Figure 3-309 [5] [5] [4]
  • Canon PC940 | Service Manual - Page 69
    7) Remove the four screws [6], and detach the lens cover [7]. CHAPTER 3 EXPOSURE SYSTEM [6] [6] [7] Figure 3-311 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-19
  • Canon PC940 | Service Manual - Page 70
    CHAPTER 3 EXPOSURE SYSTEM b. Routing the Reversing Cable 1) Wind the reversing cables (silver-colored) [2] on the end [2] Face with a marking Figure 3-312 [3] [1] [3] Top View Figure 3-313 3-20 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 71
    into the shaft, be sure that the hook is at the front. CHAPTER 3 EXPOSURE SYSTEM [5] Hook [1] (front) 3) Hook the shorter end [6] on the pulley [7]. [4] Figure 3-314 [7] [6] Figure 3-315 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-21
  • Canon PC940 | Service Manual - Page 72
    CHAPTER 3 EXPOSURE SYSTEM 4) Lead the shorter end [6] under the No. 1 mirror mount [8] and the No. 2/3 mirror mount [9]; [15] on the right front side. Figure 3-317 [14] [15] 3-22 COPYRIGHT © 1999 CANON INC. Figure 3-318 CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 73
    on the left front side and the pulley [17] of the No. 2/3 mirror mount. CHAPTER 3 EXPOSURE SYSTEM [17] [8] 8) Hook the longer end [14] on the cable hook [18]; then, secure its 14] Figure 3-320 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-23
  • Canon PC940 | Service Manual - Page 74
    CHAPTER 3 EXPOSURE SYSTEM c. Routing the Forwarding Cable [4] 1) Fit the longer end it between the No. 1 mirror mount [7] and the scanning lamp [9]. [8] [7] [9] [5] 3-24 Figure 3-323 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON
  • Canon PC940 | Service Manual - Page 75
    on the hole [10] on the right side. CHAPTER 3 EXPOSURE SYSTEM [10] 5) Free the shorter end [3], and hook it on the [3] pulley [11 . 1 mirror mount [7] and the scanning lamp [9]. Figure 3-325 [12] [3] [9] COPYRIGHT © 1999 CANON INC. [7] Figure 3-326 CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN
  • Canon PC940 | Service Manual - Page 76
    CHAPTER 3 EXPOSURE SYSTEM 7) Hook the end of the shorter end [3] on the [3] [13] hole [13] on the right side. 8) Free the shorter end [3] and the longer end [5] (reversing cable), and connect both with a spring [14]; then, fit the stopper [15]. Figure 3-327 [15] [5] [3] [14] Figure 3-
  • Canon PC940 | Service Manual - Page 77
    9) Detach the pulley clip [16] from the cable drive pulley [1]. CHAPTER 3 EXPOSURE SYSTEM [1] [16] Figure 3-329 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-27
  • Canon PC940 | Service Manual - Page 78
    3 EXPOSURE SYSTEM d. Positioning the No. 1 Mirror Mount 1) Fix the rear and the front of the No. 1 mir- [1] ror mount [1] temporarily to the metal fix- ing [2] of the forwarding cable. [2] Figure 3-330 (rear) [2] [1] Figure 3-331 (front) 3-28 COPYRIGHT © 1999 CANON INC. CANON PC800s
  • Canon PC940 | Service Manual - Page 79
    CHAPTER 3 EXPOSURE SYSTEM 2) Turn the cable drive pulley [4] so that the [3] [4] three shafts [3] of the mirror positioning tool for rear and front is as shown. [3] Figure 3-332 (rear) [3] [3] Figure 3-333 (front) COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN
  • Canon PC940 | Service Manual - Page 80
    CHAPTER 3 EXPOSURE SYSTEM 3) While keeping the condition of step 2), tighten the positioning screw on the rear and front of the No. 1 mirror mount [1]. [1] Figure 3-334 (rear) [1] Figure 3-335 (front) 3-30 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU
  • Canon PC940 | Service Manual - Page 81
    drive assembly. (See Chapter 7.III.D.2."Removing the Main Drive Assembly.") 4) Remove the four screws [1], and detach the lens cover [2]. CHAPTER 3 EXPOSURE SYSTEM [1] [1] [2] Figure 3-336 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-31
  • Canon PC940 | Service Manual - Page 82
    CHAPTER 3 EXPOSURE SYSTEM 5) Mark the position of the lens cable fixing plate [3] and the lens mount [4] of the No. 4/5 mirror mount and the gear [6]. [4] Figure 3-337 [6] [5] 3-32 Figure 3-338 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 83
    7) Remove the screw [7], and detach the cam gear [6] and the cable retainer [8]. CHAPTER 3 EXPOSURE SYSTEM [7] [6] 8) Holding the middle of the No. 1 mirror mount [9], move it to the center of the machine. Caution: Do not hold the reflecting plate. 9) Remove the spring [10]. [8] Figure 3-339 [9]
  • Canon PC940 | Service Manual - Page 84
    3 EXPOSURE SYSTEM 10) Remove the screw [11], and detach the lens cable fixing plate [12]. [11] [12] 11) Free the lens cable [13] from the lens cable fixing plate [12]; then, detach the lens cable from the machine. Figure 3-342 [13] [12] Figure 3-343 3-34 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 85
    that the lever will not come into contact when the cam gear rotates). CHAPTER 3 EXPOSURE SYSTEM [2] [1] 2) While keeping the condition in step 1), turn on the power; when [3] [1] Figure 3-345 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-35
  • Canon PC940 | Service Manual - Page 86
    CHAPTER 3 EXPOSURE SYSTEM 4) If the tip of the lever [1] and the marking on the cam gear [2] do not match, remove the the marking on it and the tip of the lever match. [4] [2] [1] Figure 3-346 3-36 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 87
    C. Exposure System 1. Removing the Scanning Lamp 1) Disconnect the power plug. 2) Remove EXPOSURE SYSTEM [1] 4) Free the harness [3] from the guide [2]; then, remove the screw [4], and detach the reflecting plate [5]. Figure 3-347 [4] [5] [3] [2] Figure 3-348 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 88
    CHAPTER 3 EXPOSURE SYSTEM 5) While pushing the electrode mount [6] found at the rear of the machine in the direction of the arrow, detach the scanning lamp [7]. Caution: 1. Do not start the work if the scanning lamp is hot. 2. Do not leave fingerprints on the sur- face of the scanning lamp. 3. If
  • Canon PC940 | Service Manual - Page 89
    • If you have replaced the scanning lamp, be sure to perform intensity adjustment (p. 11-42) and AE adjustment (p. 11-43). CHAPTER 3 EXPOSURE SYSTEM Logo mark (front) Scanning lamp (mirror mount moving in reverse) 45 (approx.) Figure 3-350 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG
  • Canon PC940 | Service Manual - Page 90
    CHAPTER 3 EXPOSURE SYSTEM 3. Removing the Thermal Fuse 1) Disconnect the power plug. 2) Remove the copyboard glass. (See Chapter plate. (front) Reflecting plate Thermal fuse Figure 3-352 3-40 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 91
    Top Cover.") 2) Disconnect the connector (J131) [1] from the DC controller PCB; remove the screw [2], and detach the thermistor unit [3]. CHAPTER 3 EXPOSURE SYSTEM [3] [2] [1] Figure 3-353 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-41
  • Canon PC940 | Service Manual - Page 92
  • Canon PC940 | Service Manual - Page 93
    and adjusted. I. IMAGE FORMATION SYSTEM ...4-1 A. Outline 4-1 B. Timing Chart for the Image Formation System 4-3 C. Controlling the Primary /ASSEMBLY ..... 4-22 A. Cartridge 4-23 B. Transfer Charging Assembly 4-25 C. Blank Exposure 4-26 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG
  • Canon PC940 | Service Manual - Page 94
  • Canon PC940 | Service Manual - Page 95
    The major functions of the image formation system are as follows: Item Controlling the primary charging roller bias Description control Developing DC bias control Blanking control Side blanking lamp Table 4-101 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN
  • Canon PC940 | Service Manual - Page 96
    CHAPTER 4 IMAGE FORMATION SYSTEM Copyboard glass Scanning lamp AE sensor Side blanking lamp Lens Primary charging roller Developing cylinder Photosensitive drum Drum cartridge Static eliminator Transfer roller Q101 Microprocessor DC controller PCB Lamp regulator block High-voltage
  • Canon PC940 | Service Manual - Page 97
    System Basic Sequence of Operations (Direct, 2 copies, continuous) Copy Start key ON STBY INTR SCFW SCRV SCFW SCRV LSTR STBY Main motor (M1) Scanning lamp bias 3200V Pre-registration roller paper sensor (Q751) Figure 4-102 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG.
  • Canon PC940 | Service Manual - Page 98
    primary charging roller so as to ensure that the surface potential of the photosensitive drum will be uniform. The level of the DC bias is switched between when forming copy images and when not forming copy images. Reference: DC component: AC component: -400 V (non-image area)/-625 V (image area
  • Canon PC940 | Service Manual - Page 99
    IMAGE FORMATION SYSTEM Voltage separation circuit T508 High-voltage transformer for primary charging Primary charging roller Photosensitive drum Amplifier (Q101) Figure 4-103 DC controller PCB COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON
  • Canon PC940 | Service Manual - Page 100
    they remain specific levels. Reference: The DC bias control signal varies its pulse duty ratio while the AC bias output signal varies its amplitude to change the level of the DC/AC bias. 4-6 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 101
    drum to a positive potential otherwise caused by the cleaning bias from the transfer roller. Copy Start key ON STBY INTR SCFW SCRV SCFW SCRV LSTR STBY Main motor (M1) Scanning lamp (LA1) Primary DC bias Primary AC bias -400V -625V Figure 4-104 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 102
    CHAPTER 4 IMAGE FORMATION SYSTEM D. Controlling the Transfer Roller Bias 1. Outline The circuit shown in high-voltage transformer Photosensitive drum Transfer charging roller DC controller PCB Figure 4-105 Composite power supply PCB 4-8 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG
  • Canon PC940 | Service Manual - Page 103
    CHAPTER 4 IMAGE FORMATION SYSTEM 2. Operations a. Turning On and Off the Transfer Bias The : The level of transfer bias applied to the transfer roller during a copying run is between -7.5 and -3.0 kV. COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON
  • Canon PC940 | Service Manual - Page 104
    transfer bias to apply using the average of the readings. d. Switching the Polarity of the Transfer Bias (cleaning bias) The machine uses a direct charging method, allowing toner to move from the photosensitive drum to the transfer roller as when a jam occurs if left unattended. To remove excess
  • Canon PC940 | Service Manual - Page 105
    FORMATION SYSTEM E. are applied to the developing cylinder while copies are being made. When the photosensitive drum rotates and yet developing is not toner on the photosensitive drum. Reference : Developing DC bias : -80 ~ -550V Developing AC bias : 1200Vpp ± 10% COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 106
    PCB Serial communication Microprocessor (Q101) -2 AE signal Copy density setting signal Copy density correction signal AE sensor PCB Control panel Density correction switch (SW101) DC controller PCB Figure 4-107 4-12 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN
  • Canon PC940 | Service Manual - Page 107
    IMAGE FORMATION SYSTEM 2. Turning On to the com- posite power supply PCB a specific period of time after copy paper has moved past the registration sensor. The microprocessor (Q900) on the kV). COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-
  • Canon PC940 | Service Manual - Page 108
    (SW101), the image density changes in AE mode according to how the density adjusting lever is set. The machine corrects the level of the developing DC bias and the voltage supplied to the scanning lamp as follows in reference to the setting used for normal copying when toner save mode or photo mode
  • Canon PC940 | Service Manual - Page 109
    Copy density adjusting lever 1 3.5 0 6.5 9 -100 -100 -200 -300 -400 -500 F1 -200 -300 F5 -400 -500 F9 Developing bias DC component (V) AE Mode Figure 4-111 (Non-SW101) Developing bias DC component (V) Manual Density Mode Figure 4-112 (Non-SW101) COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 110
    CHAPTER 4 IMAGE FORMATION SYSTEM F. Measuring the Density of Originals 1. Outline The machine is equipped with an auto density adjustment (AE) mechanism designed to control the DC component of the developing bias. The AE mechanism enables production of copies free of fogging as long as the original
  • Canon PC940 | Service Manual - Page 111
    CHAPTER 4 IMAGE FORMATION SYSTEM 2. Operations When measuring the density of an original, the scanner turns on the scanning lamp, and moves to a point 115 mm from the home position. At this time, the AE sensor reads the level of light reflected by the area shown in Figure 4-112, and sends the AE
  • Canon PC940 | Service Manual - Page 112
    • Obtain five sheets of white sheets of paper. • Check to make sure that the intensity of the scanning lamp has been adjusted when you have replaced the scanning lamp. • Set the density correction switch (SW101) to the middle setting. If the machine is not equipped with a density correction switch
  • Canon PC940 | Service Manual - Page 113
    CHAPTER 4 IMAGE FORMATION SYSTEM 2) While keeping the condition in step 1), turn on the power switch. • The scanning lamp will turn on, an 6) Turn VR102 so that the reading in the indicator is from 'A3' to 'Ad'. VR102 Figure 4-118 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999
  • Canon PC940 | Service Manual - Page 114
    CHAPTER 4 IMAGE FORMATION SYSTEM 7) Remove the newspaper from the copyboard; in its place, place five blank sheets of copy paper, and close the copyboard cover. 8) Turn VR103 on the DC controller PCB so that the reading of the indicator is from '52' to '5c'. VR103 Figure 4-119 9) Repeat steps 5)
  • Canon PC940 | Service Manual - Page 115
    CHAPTER 4 IMAGE FORMATION SYSTEM G. Controlling the Side Blanking Mechanism 1. Outline The machine is equipped with a side blanking lamp at the front and the rear used to prevent adhesion of excess toner when making reduced copies. 2. Operations To blank out the non-image area in reduce mode, the
  • Canon PC940 | Service Manual - Page 116
    SYSTEM II. DISASSEMBLY/ASSEMBLY As needed, disassemble/assemble the machine with the following in mind: 1. ! Before starting the work, turn off the power switch and disconnect the power plug for safety. 2. Unless otherwise instructed, assemble the parts the machine with any of its part removed.
  • Canon PC940 | Service Manual - Page 117
    can cause white spots or black bands on copies. To prevent photo memory, the machine is equipped with a drum cover shutter. Do not open the shutter unless absolutely necessary. It is designed to open when the cartridge is fit into the machine and the machine's top unit is closed. b. Light-Blocking
  • Canon PC940 | Service Manual - Page 118
    FORMATION SYSTEM 2. Cleaning the Drum Caution: As a rule, do not touch or clean the photosensitive drum. 1) Open the machine's top unit, and take out the cartridge. 2) Turn over the cartridge, and open the drum cover shutter 3) Clean the drum surface with a flannel cloth coated with toner. Caution
  • Canon PC940 | Service Manual - Page 119
    CHAPTER 4 IMAGE FORMATION SYSTEM B. Transfer Charging Assembly 1. Removing the Transfer Charging Roller 1) Open the machine's top unit. [2] 2) Remove the screw [1]. 3) While freeing the claw [2] of the bushing, detach the transfer charging roller [3]. Caution: Do not touch the surface of
  • Canon PC940 | Service Manual - Page 120
    CHAPTER 4 IMAGE FORMATION SYSTEM C. Blank Exposure 1. Removing the Blanking Exposure Unit 1) Set the machine to the maximum ratio (141%) as follows: • Turn on the power, and select a default ratio of 141%. • Press the Copy Start key. • When the lens has moved to the farthest left, turn off the power
  • Canon PC940 | Service Manual - Page 121
    unit, check to make sure that the blanking exposure unit PCBs are at the extreme ends and that the lens is positioned at the farthest left (141% position). [3] Figure 4-205 Lamp PCBs Figure 4-206 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON
  • Canon PC940 | Service Manual - Page 122
  • Canon PC940 | Service Manual - Page 123
    5 PICK-UP/FEEDING SYSTEM This chapter explains the principles used from when copy paper is picked up to when a copy is delivered in view . I. PICKUP/FEEDING SYSTEM.......5-1 A. Outline 5-1 B. Controlling the Pickup Roller 5-3 C. Controlling the Movement of Paper 5-9 D. Detecting Jams 5-12 II
  • Canon PC940 | Service Manual - Page 124
  • Canon PC940 | Service Manual - Page 125
    /FEEDING SYSTEM A. Outline The machine moves paper using a center reference method, in which paper is moved in the middle of the pickup/feeding path, and is equipped with a cassette, multifeeder, and single-feeder as the source of paper. From the cassette, multifeeder, or single-feeder, copy paper
  • Canon PC940 | Service Manual - Page 126
    5 PICK-UP/FEEDING SYSTEM DC controller PCB Pre-registration roller paper detection signal(RPD) Vertical path roller paper detection signal(PDP) Delivery paper detection signal(DPD) Delivery roller Copy tray PS3 Fixing assembly Cassette Multifeeder pickup roller Photosensitive drum Registration
  • Canon PC940 | Service Manual - Page 127
    /FEEDING SYSTEM B. Controlling the Pickup Roller 1. Outline The machine controls paper so that its leading edge will match the leading edge of the image on the photosensitive drum. DC SL5 Copy paper Cassette pickup rollers Figure 5-103 (Multifeeder type) COPYRIGHT © 1999 CANON INC. CANON PC800s
  • Canon PC940 | Service Manual - Page 128
    CHAPTER 5 PICK-UP/FEEDING SYSTEM DC controller PCB Spring Gear Cassette pickup solenoid drive gear to engage. Cassette pickup rollers Pickup clutch SL5 Copy paper Figure 5-104 (Single-feeder type) 5-4 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME
  • Canon PC940 | Service Manual - Page 129
    5 PICK-UP/FEEDING SYSTEM 3. Re-Pickup (cassette pickup) If the vertical path roller paper sensor (PS4) does not detect copy paper within a specific recycled paper). If the vertical path roller paper sensor does not detect copy paper after re-pickup, the machine will assume the absence of copy paper
  • Canon PC940 | Service Manual - Page 130
    gear Paper guide plate SL1 Copy paper Spring clutch Cam gear Control ring Claw Lifter Paper guide plate Multifeeder pickup roller Toothless section The cam gear makes a 180˚ turn (approximate), causing the paper guide plate to move up and down. Figure 5-106 5-6 COPYRIGHT © 1999 CANON INC
  • Canon PC940 | Service Manual - Page 131
    CHAPTER 5 PICK-UP/FEEDING SYSTEM 5. Controlling the Single-feeder Pickup Roller The single-feeder pickup roller is controlled by the pickup clutch solenoid (SL1) and the single-feeder paper sensor (PS5). When copy paper is inserted into the single-feeder, the single-feeder paper sensor turns on and
  • Canon PC940 | Service Manual - Page 132
    CHAPTER 5 PICK-UP/FEEDING SYSTEM 6. Controlling the Copying Speed in Multifeeder Mode The machine does not possess a copy paper width detecting function and, therefore, the tem- perature of the ends of the fixing assembly increases when copies are made continuously on paper narrower than A4/LTR.
  • Canon PC940 | Service Manual - Page 133
    CHAPTER 5 PICK-UP/FEEDING SYSTEM C. Controlling the Movement of Paper 1. Controlling the Registration Roller The registration roller is controlled by a spring clutch, control ring, pre-registration roller paper sensor (Q751), and registration clutch solenoid (SL2). The microprocessor on the DC
  • Canon PC940 | Service Manual - Page 134
    CHAPTER 5 PICK-UP/FEEDING SYSTEM 2. Pickup/Feeding Timing Chart a. Pickup from the Cassette (A4, 2 copies) Copy Start key ON STBY INTR SCFW SCRV SCFW SCRV LSTR STBY Main motor (M1) Pickup clutch solenoid (SL1) Cassette pickup solenoid (SL5) Vertical path roller paper sensor (PS4) Pre-
  • Canon PC940 | Service Manual - Page 135
    CHAPTER 5 PICK-UP/FEEDING SYSTEM c. Pickup from the Multifeeder (A4, 2 copies) Copy Start key ON STBY INTR SCFW SCRV SCFW SCRV LSTR STBY Main motor (M1) Multifeeder pickup solenoid (SL4) Pickup clutch solenoid (SL1) 1sec 0.1sec(approx.)  Pre-registration roller paper sensor (Q751)
  • Canon PC940 | Service Manual - Page 136
    FEEDING SYSTEM D. Detecting Jams The machine is equipped with four paper sensors used to find out the presence/absence of copy paper and whether copy paper is moving properly. • Vertical path roller paper sensor (PS4) • Single-feeder paper sensor (PS5) • Pre-registration roller paper drum PS5
  • Canon PC940 | Service Manual - Page 137
    5 PICK-UP/FEEDING SYSTEM 1. Multifeeder Pickup Assembly (no paper, pickup delay jam) If copy paper does not reach the pre-registration roller paper sensor within a specific period of time in multifeeder mode, the condition will be identified as the absence of paper; the machine will stop the
  • Canon PC940 | Service Manual - Page 138
    CHAPTER 5 PICK-UP/FEEDING SYSTEM Copy Start key ON STBY INTR indication SCFW Pickup clutch solenoid (SL1) Jam check Pre-registration roller paper sensor (Q751) Main motor (M1) 2.6sec No paper Jam 1.5sec Figure 5-117 (jam) 2. Absence of Paper in the Cassette Pickup Assembly When re-pickup
  • Canon PC940 | Service Manual - Page 139
    5 PICK-UP/FEEDING SYSTEM 3. Single-feeder Pickup Delay Jam After being detected by the single-feeder paper sensor, if copy paper does not reach the pre- registration roller sensor within a specific period of time, the machine will identify the condition as a single feed pickup delay jam, stop the
  • Canon PC940 | Service Manual - Page 140
    PICK-UP/FEEDING SYSTEM 5. Registration Paper Delay Jam After reaching the vertical path roller paper sensor, if copy paper fails to reach the pre-registra- tion roller paper sensor within a specific period of time, the machine will identify the condition as a registration paper delay jam, stop the
  • Canon PC940 | Service Manual - Page 141
    5 PICK-UP/FEEDING SYSTEM 7. Delivery Delay Jam If copy paper does not reach the delivery sensor within a specific period of time because of feeding faults, the machine will identify the condition as a delivery delay jam, stop the operation immediately, and flash the Jam indicator. Copy Start key
  • Canon PC940 | Service Manual - Page 142
    FEEDING SYSTEM II. DISASSEMBLY/ASSEMBLY As needed, disassemble/assemble the machine with the following in mind: 1. ! Before starting the work, turn off the power switch and disconnect the power plug for safety. 2. Unless otherwise instructed, assemble the parts the machine with any of its part
  • Canon PC940 | Service Manual - Page 143
    Open the machines' top unit farther, and hold it in place with the handle of a screwdriver (about 30 mm in diameter). 4) Remove the screw [1], and free the two claws [2]; then, detach the feeding assembly cover [3]. Figure 5-201 [1] [2] [3] Figure 5-202 COPYRIGHT © 1999 CANON INC. CANON PC800s
  • Canon PC940 | Service Manual - Page 144
    CHAPTER 5 PICK-UP/FEEDING SYSTEM 5) While pulling the guide plate [4] of the cassette pickup solenoid in the direction of the arrow, turn the gear [5] slightly in the direction of the arrow to disengage the guide plate [4] and the gear [6]. [5] [6] 6) While pulling the plunger [7] of the pickup
  • Canon PC940 | Service Manual - Page 145
    /FEEDING SYSTEM 7) Using a hex wrench or the like, push the hook [10] of the pickup roller through the hole to remove the pickup roller [11]. Caution: When removing the pickup roller, be sure to push the claw while holding the shaft in place so as to prevent the pickup roller shaft from freeing
  • Canon PC940 | Service Manual - Page 146
    /FEEDING SYSTEM 2. Removing the Pickup Clutch 2.1 Removing the Pickup Clutch (single- feeder type) 1) Remove the front lower cover. (See Chapter 7.III.A.2."Removing the Front Lower Cover.") 2) Remove the registration roller unit. (See E.1."Removing the Registration Roller Unit.") 3) Open the machine
  • Canon PC940 | Service Manual - Page 147
    CHAPTER 5 PICK-UP/FEEDING SYSTEM 5) Remove the screw [4] and the two claws [5], and detach the gear unit [6]. [6] [5] 6) Free the claw [7] of the gear unit [6], and detach the clutch unit [8]. [4] [5] Figure 5-209 [6] 7) Remove the E-ring [9] and the washer [10], and detach the pickup clutch
  • Canon PC940 | Service Manual - Page 148
    CHAPTER 5 PICK-UP/FEEDING SYSTEM 2.2 Removing the Pickup Clutch (multifeeder type) 1) Remove the front lower cover. (See Chapter 7.III.A.2."Removing the Front Lower Cover.") 2) Remove the registration roller unit. (See E.1."Removing the Registration Roller Unit.") 3) Open the machine's top unit
  • Canon PC940 | Service Manual - Page 149
    CHAPTER 5 PICK-UP/FEEDING SYSTEM 5) While freeing the two claws [4], remove the pickup clutch unit [5]. [4] [5] [4] Figure 5-214 6) Remove the E-ring [6], and detach the [7] pickup clutch [7]. [6] Figure 5-215 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN
  • Canon PC940 | Service Manual - Page 150
    -UP/FEEDING SYSTEM 3. Removing the Vertical Path Roller 1) Remove the front lower cover. (See Chapter 7.III.A.2."Removing the Front Lower Cover.") 2) Open the machine's top unit farther, and hold it using the handle of a screwdriver (about 30 mm in diameter). 3) Remove the screw [1], and free the
  • Canon PC940 | Service Manual - Page 151
    CHAPTER 5 PICK-UP/FEEDING SYSTEM 4) While lifting the sensor lever [4], remove [5] the vertical path roller [5]. [4] Figure 5-218 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 5-27
  • Canon PC940 | Service Manual - Page 152
    CHAPTER 5 PICK-UP/FEEDING SYSTEM B. Multifeeder Assembly 1. Removing the Multifeeder Unit 1) Open the right 3) Mount the multifeeder unit; then, make a copy using the multifeeder. Pickup gear unit Figure 5-220 5-28 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (
  • Canon PC940 | Service Manual - Page 153
    -UP/FEEDING SYSTEM 2. Removing the Multifeeder Pickup Roller 1) Remove the multifeeder unit. (See 1. "Removing the Multifeeder Unit.") 2) Free the claw [1], and remove the gear [2] and the bushing [3]. [2] [1] [1] [3] 3) Remove the multifeeder pickup roller unit [4]. 4) While freeing the
  • Canon PC940 | Service Manual - Page 154
    CHAPTER 5 PICK-UP/FEEDING SYSTEM 3. Removing the Separation Pad 1) Remove the multifeeder pickup roller to- gether with its shaft. (See 2. "Removing the Multifeeder Pickup Roller.") 2) Remove the multifeeder tray. 3) Slide the side guide [1] to the inside about 3 cm, and free the two claws [2]; then
  • Canon PC940 | Service Manual - Page 155
    CHAPTER 5 PICK-UP/FEEDING SYSTEM C. Single-feeder Assembly [2] 1. Removing the Single-feeder Unit 1) Open roller assembly [4] together with the paper guide plate [3]. [1] Figure 5-226 [1] [2] Figure 5-227 [3] [4] Figure 5-228 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999
  • Canon PC940 | Service Manual - Page 156
    CHAPTER 5 PICK-UP/FEEDING SYSTEM 4) Free the claw [5] of the paper guide plate [3], and remove the single-feeder pickup roller [6]. [6] [5] [3] Figure 5-229 5-32 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 157
    CHAPTER 5 PICK-UP/FEEDING SYSTEM D. Feeding Assembly [2] 1. Detaching the Feed Belt 1) Open the machine's top unit. 2) Push down the stopper [1], and remove the gear [2]. 3) While freeing the claw [3], detach the four shafts [4]; then, detach the feed belt [5]. [1] Figure 5-230 [3] [4] [5]
  • Canon PC940 | Service Manual - Page 158
    CHAPTER 5 PICK-UP/FEEDING SYSTEM E. Registration Roller Assembly 1. Removing the Registration Roller Unit 1) Open the machine's top unit. [1] 2) Remove the spring [1] (front, rear). 3) Remove the two bushings [2] and remove the registration roller lower unit [3]. [1] Figure 5-232 [2] [3]
  • Canon PC940 | Service Manual - Page 159
    CHAPTER 5 PICK-UP/FEEDING SYSTEM 2. Removing the Registration Roller Clutch 1) Remove the registration roller unit. (See 1. "Removing the lose it when removing the clutch. [6] Figure 5-236 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 5-35
  • Canon PC940 | Service Manual - Page 160
    5 PICK-UP/FEEDING SYSTEM F. Delivery Assembly 1. Removing the Delivery Roller 1) Remove the fixing lower roller. (See Chapter 6.II.A.3."Removing the Fixing Lower Roller.") 2) Remove the two screws [1], and detach the side plate [2] and the four gears [3]. 3) Remove the screw [4], and free the two
  • Canon PC940 | Service Manual - Page 161
    4) Remove the two bushings [7]. CHAPTER 5 PICK-UP/FEEDING SYSTEM 5) While shifting the delivery lower guide [8] toward the rear, detach the delivery roller [9]. [7] Figure 5-239 [8] [9] Figure 5-240 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON
  • Canon PC940 | Service Manual - Page 162
  • Canon PC940 | Service Manual - Page 163
    CHAPTER 6 FIXING SYSTEM This chapter explains the principles used to fuse toner images to transfer medium in view of Temperature 6-3 II. DISASSEMBLY/ASSEMBLY ..... 6-10 A. Fixing Assembly 6-11 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 164
  • Canon PC940 | Service Manual - Page 165
    (FU2; activating at 228°C) Error code E000 E001 E002 E003 The fixing temperature fails to increase. The thermistor has detected overheating. Fault in fixing power control. The fixing temperature has dropped abnormally. Table 6-101 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999
  • Canon PC940 | Service Manual - Page 166
    CHAPTER 6 FIXING SYSTEM Thermal fuse 2 (FU2) Fixing film Fixing heater (H1) Fixing thermistor (TH1) Fixing lower roller Cleaning roller Composite power supply PCB Figure 6-102 M1 Main motor COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 167
    6 FIXING SYSTEM B. Controlling error signal MicroHEAT_OFF processor Fixing heater OFF signal HEAT_PWM Fixing heater duty signal HEAT_TRG Fixing heater drive signal Composite power supply PCB C123 E0_DT + E0 detection signal DC controller PCB Figure 6-103 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 168
    of the fixing heater when the Copy Start key is pressed (as detected by the thermistor TH1) and the temperatures to which the fixing heater is controlled according to the number of copies made in continuous mode. 6-4 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED
  • Canon PC940 | Service Manual - Page 169
    CHAPTER 6 FIXING SYSTEM Heater temperature when the Copy Number of copies Control temperature (°C) Start key is pressed 1 Less than 40 1 11 21 Number of Copies in Continuous Copying Mode after a Press on the Copy Start Key Figure 6-104 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0
  • Canon PC940 | Service Manual - Page 170
    SYSTEM machine makes correction in relation to the selected level of resistance (from three settings), and corrects it basd on the readings obtained assembly is assembled. Do not change the combination of jumper wires. 6-6 Figure 6-106 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG.
  • Canon PC940 | Service Manual - Page 171
    tends to increase because of the increased sheet-to-sheet distance. To prevent possible problems, power to the fixing heater is stopped between sheets when the copying speed is controlled to 6 cpm. Switching to 6-cpm copying speed SCRV SCFW SCRV SCFW SCRV LSTR STBY Main motor (M1) Registration
  • Canon PC940 | Service Manual - Page 172
    5 min, however, a press on the Copy Start key will be recognized. If an error is detected in relation to the heater during copying operation, the machine will indicate 'E000' through 'E003' in the control panel once again and turn off the power. Related Error Code E000 • The temperature detected by
  • Canon PC940 | Service Manual - Page 173
    CHAPTER 6 FIXING SYSTEM b. Thermal Fuse (FU2) If the temperature around the thermal fuse exceeds 228°C and remains so for a specific period of time, the thermal fuse will blow to cut the power to the fixing heater. COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (
  • Canon PC940 | Service Manual - Page 174
    SYSTEM II. DISASSEMBLY/ASSEMBLY As needed, disassemble/assemble the machine with the following in mind: 1. ! Before starting the work, turn off the power switch and disconnect the power plug for safety. 2. Unless otherwise instructed, assemble the parts the machine with any of its part removed.
  • Canon PC940 | Service Manual - Page 175
    machine does not have a mechanism used to adjust the roller pressure. CHAPTER 6 FIXING SYSTEM [1] [2] [5] [4] [3] [1] Fixing heater [2] Fixing film [3] Inlet guide free the two hooks [2]; then, detach the power supply cover [3]. [1] [2] [3] Figure 6-202 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 176
    FIXING SYSTEM 3) Remove the screw [4], and disconnect the connector [5]. [5] 4) Remove the two screws [6], and disconnect the connector [7]; then, detach the fixing assembly [8] by turning it in the direction of the arrow. [4] Figure 6-203 [6] [8] [7] Figure 6-204 6-12 COPYRIGHT © 1999 CANON
  • Canon PC940 | Service Manual - Page 177
    SYSTEM 3) Detach the harness band [4] from the side plate, and remove the fixing upper unit [5]. Caution: Do not disassemble the fixing film and the fixing heater. They cannot be replaced on their own. [2] [3] [1] [2] Figure 6-205 [5] [4] Figure 6-206 COPYRIGHT © 1999 CANON INC. CANON PC800s
  • Canon PC940 | Service Manual - Page 178
    CHAPTER 6 FIXING SYSTEM 4) Remove the fixing lower roller [6] to- [6] gether with the gear. 4. Removing the Cleaning roller [1] together with the bushing. Figure 6-207 [1] Figure 6-208 6-14 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 179
    an Error on the Composite Power Supply PCB 7-6 D. Protecting the Power Supply Circuit 7-6 III. DISASSEMBLY/ASSEMBLY ........7-7 A. External Covers 7-8 B. Control Panel 7-15 C. Copyboard Glass 7-16 D. Main Motor/Main Drive Assembly 7-17 E. Electrical System 7-21 COPYRIGHT © 1999 CANON INC
  • Canon PC940 | Service Manual - Page 180
  • Canon PC940 | Service Manual - Page 181
    CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS I. FANS The machine is equipped with two fans serving to discharge ozone or cool its the main motor is rotating. Heat exhausting fan FM1 Figure 7-101 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 7-1
  • Canon PC940 | Service Manual - Page 182
    If the reading by the thermistor is 37.5°C or higher and the copying speed reaches 6 cpm, the fan starts to rotate. If the reading is lower than 6-cpm copying speed control is executed starting with the first copy, the fan will rotate. Figure 7-102 7-2 COPYRIGHT © 1999 CANON INC. CANON PC800s/
  • Canon PC940 | Service Manual - Page 183
    II. POWER SUPPLY SYSTEM A. Outline of the Power Supply System Door switch DS1 Power lamp +24VU Main motor/ main motor M1 driver PCB Fixing heater Scanning lamp Primary charging roller Developing roller Transfer roller Static eliminator Figure 7-201 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 184
    part of the DC controller circuit. When 'E000', 'E001', 'E002', or 'E003' occurs, the capacitor (C123) collects electric charge; if charge exists in the capacitor while the power switch is on, the machine indicates 'E0' on the control panel to indicate that an error used: • During copying, +24 V ±5%
  • Canon PC940 | Service Manual - Page 185
    - mer T101 DC power supply +5V +24VR +24VU Power switch SW309 + C123 Control panel DC controller PCB Microprocessor (Q900) Power supply Figure 7-202 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 7-5
  • Canon PC940 | Service Manual - Page 186
    Error on the Composite Power Supply PCB The machine errors occurs, the microprocessor will exchange signals with the DC controller PCB, and will indicate the result of self diagnosis on the control panel. 1. Detecting an Over-Current in the Low-Voltage System by opening the machine's top unit,
  • Canon PC940 | Service Manual - Page 187
    machine with the following in mind: 1. ! Before starting the work, turn off the power switch and disconnect the power plug for safety. 2. Unless otherwise instructed, assemble the parts band. 6. As a rule, do not operate the machine with any of its part removed. 7. A few of the screws used are
  • Canon PC940 | Service Manual - Page 188
    For instructions on how to remove the ADF, see Chapter 8. [1] [2] [3] [4] [7] [6] [1] Copyboard cover [2] Top cover [3] Control panel [4] Front lower cover [5] [5] Cassette [6] Front upper cover [7] Left cover Figure 7-301 (Copyboard type) 7-8 COPYRIGHT © 1999 CANON INC. CANON PC800s
  • Canon PC940 | Service Manual - Page 189
    as necessary when cleaning, inspecting, or repairing the inside of the machine. Those covers that may be detached from their own by mere Rear cover [2] Right door [3] Multifeeder unit Figure 7-303 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 190
    Top Cover 1) Remove the copyboard cover or the ADF. 2) Open the machine's top unit. 3) Remove the two screws [1], and detach [1] the Free the two claws [3], and slide the left cover [4] to detach. [2] [1] Figure 7-304 [3] [4] [3] Figure 7-305 7-10 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 191
    MECHANISMS 5) Remove the screw [5], and free the four [7] claws [6]; then, detach the rear cover [7]. [6] 6) Remove the screw [8], and detach the copyboard cover foot retainer [9]. [5] Figure 7-306 [8] [9] Figure 7-307 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED
  • Canon PC940 | Service Manual - Page 192
    CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS 7) Free the two claw [10]; then lift the top cover [11] to detach. [10] [10] [11] Figure 7-308 7-12 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 193
    and detach the multifeeder unit [2] (or the singlefeeder unit). [1] [2] 3) Open the machine's top unit. 4) Remove the two screws [3], and detach the front upper cover [4]. [4] [3] Figure 7-310 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 7-13
  • Canon PC940 | Service Manual - Page 194
    assembly has moved to its upper limit, turn off the power switch. 3) Mount the multifeeder, and make one copy using it as the source of paper. 7-14 COPYRIGHT © 1999 CANON INC. [7] [6] Figure 7-312 Pickup gear unit Figure 7-313 CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 195
    copy density adjusting lever [5] to the farthest right, and free the four claws [6]; then, detach the control panel [7]. [2] [1] Figure 7-314 [6] [4] Move to the right Lighter Darker Auto Exposure Manual Exposure Photo Timer Saver [3] [7] [5] Figure 7-315 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 196
    "Remov- ing the Top Cover.") 2) Close the machine's top unit. 3) Remove the two screws [1], and detach the two support plates [2]; then, detach the [3] copyboard glass plate 7-16 COPYRIGHT © 1999 CANON INC. Figure 7-317 CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 197
    the drum cartridge. 2) Remove the composite power supply PCB. (See E.2. "Removing the Composite Power Supply PCB.") 3) Remove the screw [1], and detach the high-voltage PCB [2]. 4) Remove the insulating sheet [3]. [1] [2] Figure 7-318 [3] Figure 7-319 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 198
    : When installing the main motor unit, be sure to attach the fan belt. After attaching the fan belt, make sure that the belt is free of twists. [4] Figure 7-320 [5] [6] [5] Figure 7-321 7-18 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 199
    the drum cartridge. 2) Remove the composite power supply PCB. (See E.2. "Removing the Composite Power Supply PCB.") 3) Remove the screw [1], and detach the high-voltage PCB [2]. 4) Remove the insulating sheet [3]. [1] [2] Figure 7-322 [3] Figure 7-323 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 200
    : When installing the main drive assembly, be sure to attach the fan belt. After attaching the fan belt, make sure that the belt is free of twists. [4] Figure 7-324 [6] [5] [5] Figure 7-325 7-20 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 201
    7 EXTERNALS/AUXILIARY MECHANISMS E. Electrical System 1. Removing the DC Controller PCB 1) Open the machine's top unit. 2) Remove the free the six claws [4]; then, detach the DC controller PCB [5]. [2] [1] Figure 7-326 [3] [4] [5] [4] [4] Figure 7-327 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 202
    the ten connectors [3] from the composite power supply PCB, and disconnect the connector [4] from the main motor assembly. [1] [2] Figure 7-328 [3] [3] [3] [4] Figure 7-329 7-22 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 203
    CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS 5) Remove the seven screws [5], and free the [6] five claws [6]; then, detach the composite power supply PCB [7]. [5] [5] [7] [5] Figure 7-330 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 7-23
  • Canon PC940 | Service Manual - Page 204
    Supply PCB 1) Some capacitors on the composite power supply hold charges when the machine's power supply is off. Take extra care never to short the terminals of the of the board. Figure 7-331 7-24 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 205
    Motor .. 8-15 I. Detecting Original Jams ..... 8-16 J. Power Supply 8-17 II. DISASSEMBLY/ASSEMBLY ..... 8-18 A. Removing the ADF 8-19 B. External Covers 8-21 C. Drive System 8-23 D. Feeding System 8-26 E. Electrical System 8-33 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999
  • Canon PC940 | Service Manual - Page 206
  • Canon PC940 | Service Manual - Page 207
    tray starting with the topmost original, moves them through the copyboard, and delivers them. See Figure 8-101 for an outline of the feeding route. ADF Original tray Copier Figure 8-101 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 8-1
  • Canon PC940 | Service Manual - Page 208
    controller PCB reads the signals from the sensors and the copier and generates signals to drive the motor at such times as programmed in advance. The copying modes selected on the copier are communicated to the ADF in serial, and the ADF communicates to the copier the state of feeding originals to
  • Canon PC940 | Service Manual - Page 209
    '1'. -2 (when light-blocking plate is at sensor) Registration paper sensor PI2 Original placement sensor PI3 Belt motor M1 Pickup motor M2 8-14. J114 J202 J2 Serial communication Copier *Negative logic. Figure 8-103 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN
  • Canon PC940 | Service Manual - Page 210
    movement of originals. The ADF is designed to accommodate one-sided original copying mode only. ADF controller PCB Delivery paper detection signal (PDP1) J5-3 Pick-up paper detection signal (PDP3) J5-9 Registration paper detection signal (PDP2) J5-6 Belt motor drive signal Pickup motor drive signal
  • Canon PC940 | Service Manual - Page 211
    copyboard glass, and delivers it to the copyboard glass. Delivery tray Originals Placing originals Original tray Picking up an original Feeding 1 Feeding 2 Copying Delivering Figure 8-105 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 8-5
  • Canon PC940 | Service Manual - Page 212
    of the detecting lever away from the sensor. Original Original tray Detecting lever PI3 ADF controller PCB Figure 8-106 Original detection signal (PDP3) 8-6 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 213
    based on the time it takes for the original to move past the registration paper sensor (PI2). Using the result of the computation, the ADF controller determines ADF operation sequence. Original Original tray PI2 PI3 Registration paper detection signal (PDP2) ADF controller PCB Figure 8-107
  • Canon PC940 | Service Manual - Page 214
    counterclockwise and the paper guide holds the original in place. 1st original Original tray PI3 Paper guide Figure 8-108 2 Pickup Separation When the Copy Start key is roller Figure 8-109 8-8 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 215
    (M2) is rotated counterclockwise to prepare for picking up the second original. Delivery sensor PI1 1st original Feeding belt Figure 8-111 2nd original Original tray PI3 Paper guide Figure 8-112 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 8-9
  • Canon PC940 | Service Manual - Page 216
    first original is stopped at a specific location on the copyboard glass. 1st original Feeding belt Figure 8-113 6 Moving the Scanner and Picking Up the Second Original The Figure 8-114 8-10 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 217
    key ON Preparing for Picking up pickup /separating Arching Pickig up Feeding 1 Preparing for pickup of 2nd original : motor CCW rotation Figure 8-116 Feeding 2 Copying Feeding 15mm farther COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON
  • Canon PC940 | Service Manual - Page 218
    operates as follows to deliver originals from the copyboard glass: 1 Delivery Feeding The feeding belt is moved to feed and deliver the first original on the copyboard glass. At the same 8-118 8-12 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 219
    Copying Delivering Pickup motor (M2) Belt motor (M1) Original detection sensor (PI3) Registration sensor (PI2) Delivery sensor (PI1) Feeding farther 15mm Feeding farther 15mm Feeding farther 15mm : motor CCW rotation : motor low-speed rotation Figure 8-120 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 220
    Figure 8-121 is a diagram of the control circuit for fault causes the ADF controller to flash the JAM indicator on the copier and stop the pickup motor at the same rotation Braked Picking up Delivering At reset (free) 8-14 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN
  • Canon PC940 | Service Manual - Page 221
    faults. Any feeding fault will cause the ADF controller to flash the Jam indicator on the controller and stop the belt motor at the same time. Q1 A CPU A* B B* ADF controller PCB +24V MA Q4 Motor driver MA* MB MB* Belt motor M1 Figure 8-122 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s
  • Canon PC940 | Service Manual - Page 222
    ADF controller PCB; a jam is identified in relation to the presence of an original at pickup starts, the registration sensor (PI2) does not turn off after feeding the original for about 500 mm. The ADF is opened while CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 223
    8-124 shows the routes of power supply. The ADF is supplied by the copier with 5 V and 24 V. The 24V supply is cut off when the power supply PCB J101-3 5V J1-3 Circuitbreaker (CB1) Fuse resistor (R1) Logic Copier ADF controller PCB Figure 8-124 Belt motor (M1) Pickup motor (M2) Delivery
  • Canon PC940 | Service Manual - Page 224
    machine with the following in mind: 1. ! Before starting the work, turn off the power switch and disconnect the power plug for safety. 2. Unless otherwise instructed, assemble the parts band. 6. As a rule, do not operate the machine with any of its part removed. 7. A few of the screws used are
  • Canon PC940 | Service Manual - Page 225
    and free the four claws [4]; then, the detach the rear cover [5]. [1] [4] [2] [1] Figure 8-201 [5] [3] Figure 8-202 4) Close the machine's top unit. [6] 5) Remove the two screws [6], and remove the fixing plate [7]. [7] Figure 8-203 COPYRIGHT © 1999 CANON INC. CANON PC800s
  • Canon PC940 | Service Manual - Page 226
    [8], and remove the screw [9]; then, remove the cable bush [10]. [10] [8] [9] 7) Remove the two lockpin [11], and remove the ADF from the copier. [8] Figure 8-204 [11] [11] Figure 8-205 8-20 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 227
    or repairing the inside of the machine: 1) Remove the ADF from the copier. (See "A. Removing the ADF.") 2) Remove the feeding roller [1] from the bushing [2]. [2] [1] Upper cover [2] Lower cover Figure 8-206 [1] [2] [1] [2] Figure 8-207 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG
  • Canon PC940 | Service Manual - Page 228
    [3], and separate the lower cover [4] from the upper cover [3] [5]. [3] [4] [3] 4) Disconnect the connector [6], and remove the lower cover [4]. [5] Figure 8-208 [4] [6] Figure 8-209 8-22 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 229
    C. Drive System 1. Drive Unit 1) Remove the lower cover. (See "B. External Covers.") 2) Remove the screw the E-ring [4], and remove the bearing [5]. [3] [2] Figure 8-210 [5] [4] Figure 8-211 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 8-23
  • Canon PC940 | Service Manual - Page 230
    CHAPTER 8 ADF 4) Remove the timing belt [6], and remove the feeding belt roller [7] by shifting it in the direction of the arrow. [6] [7] bushing [11]. Figure 8-213 [11] [10] 8-24 Figure 8-214 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 231
    7) Disconnect the two connectors [12], and remove the five screws [13]; then, remove the drive unit [14]. CHAPTER 8 ADF [13] [14] [13] [12] Figure 8-215 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 8-25
  • Canon PC940 | Service Manual - Page 232
    CHAPTER 8 ADF D. Feeding System 1. Pickup Roller 1) Remove the drive unit [1]. [1] (See "C.1. Drive Unit.") 2) Remove Remove the stop ring [5]. [3] [2] Figure 8-217 [5] Figure 8-218 8-26 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 233
    4) Remove the two straight pins [6], and remove the pickup roller 2 [8] while moving the cover [7] in the direction of the arrow. CHAPTER 8 ADF [7] [8] [6] [6] Figure 8-219 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 8-27
  • Canon PC940 | Service Manual - Page 234
    arm. 3) While pushing the bushing [3] in the direction of the arrow, pull out the registration roller shaft [2] slowly. [2] [3] [1] Figure 8-220 Figure 8-221 8-28 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 235
    the two tension springs [1]. CHAPTER 8 ADF [1] 3) Remove the E-ring [2], and remove the bearing [3]. 4) Remove the timing belt [4], and remove the feeding belt drive roller [5] by moving it in the direction of the arrow. Figure 8-222 [3] [2] Figure 8-223 [4] [5] Figure 8-224 COPYRIGHT © 1999
  • Canon PC940 | Service Manual - Page 236
    two feeding belt rolls [7]. 6) Remove the two screws [9], and remove the delivery sensor unit [8]. [7] [6] [7] Figure 8-225 [9] [8] 7) Remove the stop ring [10] (made of resin); then, remove the bushing [11]. Figure 8-226 [10] [11] Figure 8-227 8-30 COPYRIGHT © 1999 CANON INC. CANON PC800s
  • Canon PC940 | Service Manual - Page 237
    , remove the timing belt [18], gear [19], and two bushings [20]. [20] [17] [16] [15] Figure 8-229 [20] [19] [17] [18] Figure 8-230 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 8-31
  • Canon PC940 | Service Manual - Page 238
    CHAPTER 8 ADF 11) Pull out the actuator [21] in the direction of the arrow; then, remove the feeding belt link roller [22], and remove the feeding belt [23]. [23] [21] [22] Figure 8-231 8-32 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 239
    placement sensor and the registration paper sensor. Sensor Original placement sensor Registration paper sensor Cable color Purple Yellow Table 8-201 [2] [1] Figure 8-232 Original placement sensor Registration paper sensor Figure 8-233 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG
  • Canon PC940 | Service Manual - Page 240
  • Canon PC940 | Service Manual - Page 241
    CHAPTER 9 INSTALLATION I. SELECTING A SITE 9-1 II. UNPACKING AND INSTALLATION 9-2 A. Unpacking and Installation ....9-2 B. Placing Copy Paper 9-9 III. MOVING THE MACHINE .......... 9-12 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 242
  • Canon PC940 | Service Manual - Page 243
    will remain in contact, and will hold the machine level. • The machine must be at least 10 cm/3.9 in. away from any wall, and there must be adequate space for work involving the machine. 10cm min. Figure 9-101 10cm min. COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN
  • Canon PC940 | Service Manual - Page 244
    Step 1 2 Work Checks and remarks Take out the copier and the attachments from the shipping box, and check to make sure that none is missing: • Cassette • Copy tray • Power cord • ADF auxiliary tray (ADF type only) • User's Manual • Manual feed tray (for some areas only) • Language label for
  • Canon PC940 | Service Manual - Page 245
    step applies only if the manual feed tray is attached. Attach the manual feed tray that comes with the machine. (Multifeeder type only) Caution: This applies only if the manual feed tray comes packaged with the machine. Manual feed tray COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG
  • Canon PC940 | Service Manual - Page 246
    protective members. Caution: If the protective member is not found on the machine, go to the next step. Checks and remarks Protective sheet Protective members Open/close lever Protective member 9-4 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON
  • Canon PC940 | Service Manual - Page 247
    's bottom unit. [2] [1] 10 Hold the tab of the cartridge, and take it out of the machine. 11 Holding the cartridge with the warning label facing up, shake it several times in both directions (90°). COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON
  • Canon PC940 | Service Manual - Page 248
    at an angle. 13 Hold the cartridge with the waning label facing up, and insert it into the machine with care until it stops. Checks and machine to close it fully. 15 Open the original tray. Caution: This step applies to the ADF type only. Original tray 9-6 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 249
    '1'. • Press the Count/Zoom Set key and the Clear/Stop key to check that the copy count is correct. • Press the Default Ratio key to check that different ratios are indicated. correct ratio. COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 9-7
  • Canon PC940 | Service Manual - Page 250
    all in place. 21 Place copy paper inside the cassette. (For how, see B. "Placing Copy Paper.") 22 All notations on the label attached to the ADF is in English. If a non-English language is needed, select the appropriate label from among those that come with the machine and stick it. Caution: This
  • Canon PC940 | Service Manual - Page 251
    3 Slide the side paper guide plate to suit the width of the copy paper to be used; then, turn the fixing lever as shown to lock the side paper guide plate in place. Fixing lever (front) Side paper guide plate (rear) Side paper guide plate (front) COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV
  • Canon PC940 | Service Manual - Page 252
    CHAPTER 9 INSTALLATION Step 4 Work Place copy paper in the cassette, and set the cassette into the machine. Checks and remarks 5 All text on the label attached to the cassette is English. If you need to replace it with a nonEnglish label, select the appropriate one from among those packaged with
  • Canon PC940 | Service Manual - Page 253
    500-sheet cassette (LTR/LGL) only. 3 Place copy paper in the cassette; then, set the cassette in the machine. CHAPTER 9 INSTALLATION Checks and remarks Rear end guide plate • 500-sheet cassette • 250-sheet cassette COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN
  • Canon PC940 | Service Manual - Page 254
    replaced. Step 1 2 3 4 5 Work Checks and remarks Turn on the power, and press the Default Ratio key to select 70%. Press the Paper Select key to select the manual The count/ratio indicator will indicate ' '. feed tray; then, press the Copy Start key without placing any paper on the manual feed
  • Canon PC940 | Service Manual - Page 255
    Place A4/LGL copy paper on the copyboard glass, and close the copyboard cover; then, tape it in place. (Copyboard type only) Raise the ADF. Then, place two parts used as packaging so that they fit closely around both sides and the front of the ADF, as shown in the diagram, and secure them
  • Canon PC940 | Service Manual - Page 256
  • Canon PC940 | Service Manual - Page 257
    MAINTENANCE AND SERVICING I. PERIODICALLY REPLACED PARTS 10-1 II. DURABLES AND CONSUMABLES 10-1 III. SCHEDULED SERVICING ....... 10-1 IV. STORING AND HANDLING THE CARTRIDGE 10-2 A. Storing the Cartridge with the Packaging Seal Intact ........ 10-2 B. Storing and Handling the Cartridge with the
  • Canon PC940 | Service Manual - Page 258
    which must be replaced on a periodical basis. II. DURABLES AND CONSUMABLES The machine does not have items designated as durables or consumables. III. SCHEDULED SERVICING The machine does not have any parts which require scheduled servicing. COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG
  • Canon PC940 | Service Manual - Page 259
    AND SERVICING IV. STORING AND HANDLING THE CARTRIDGE The cartridge is subject to the effects of the environment whether its packing seal is intact or removed or whether it is inside the machine or otherwise, changing over time regardless of the number of copies made. The degree of change is
  • Canon PC940 | Service Manual - Page 260
    10 MAINTENANCE AND SERVICING B. Storing and Handling the Cartridge with the Packaging Seal Removed The photosensitive medium is an organic photoconducting (OPC) material, which would deteriorate if subjected to storing light. The cartridge also holds toner, requiring the user to exercise care
  • Canon PC940 | Service Manual - Page 261
    10 MAINTENANCE AND SERVICING 2. Handling the Cartridge a. Before setting the cartridge in the machine or if copies have white spots as when it starts to run out of toner, hold the cartridge level and shake it about 90° several times as shown in Figure 10401 to even out the toner inside. If you
  • Canon PC940 | Service Manual - Page 262
    or vertical bands), however, may not disappear. Keep the following in mind: Caution: 1. Try to work briskly when removing a jam or replacing the cartridge. 2. If the cartridge must be taken out of the machine for storage, be sure to put it in a protective box or put a cover over it. Do not leave it
  • Canon PC940 | Service Manual - Page 263
  • Canon PC940 | Service Manual - Page 264
    MALFUNCTIONS 11-61 A. Troubleshooting Malfunctions 11-61 V. TROUBLESHOOTING FEEDING PROBLEMS 11-75 A. Copy Paper Jam 11-75 B. Faulty Feeding 11-78 VI. ARRANGEMENT AND FUNCTIONS OF ELECTRICAL PARTS 11-79 A. Sensors and Solenoids .... 11-79 B. Switches 11-80 C. Lamp, Heater, Motor, Etc
  • Canon PC940 | Service Manual - Page 265
  • Canon PC940 | Service Manual - Page 266
    CHAPTER 11 TROUBLESHOOTING Guide to the Troubleshooting Procedure This chapter provides troubleshooting instructions in the cover. Inform the user that Go to step 6. (Rest omitted.) • To find out the cause (possible fault) of a specific problem, see the "Cause" column. If the problem is "AC power
  • Canon PC940 | Service Manual - Page 267
    3 Is the rated voltage present at the NO Advise the user that the problem power source? is not the copier's. YES Rest omitted. • Often, you will find the following instructions when checking the voltage using a meter: "measure the voltage between J109-1 (+) and -2 (-) on the DC controller
  • Canon PC940 | Service Manual - Page 268
    Check the following: 1. Cartridge 2. Scanning lamp 3. AE sensor PCB 4. DC controller PCB 5. Composite power supply PCB (See the appropriate troubleshooting procedure.) END Note: 1. Applies only if the machine is equipped with a copy density correction switch (SW101). 2. The machine is not equipped
  • Canon PC940 | Service Manual - Page 269
    . Dry wiping. If dirt cannot be removed, dry-wiping with lint-free paper. Fixing Assembly, Delivery Assembly Item Tools/solvent Inlet guide Solvent Work/remarks Cleaning. ADF Item Tool/solvent Feeding belt Cloth moistened with water* Separation pad Pickup roller Cloth Cloth moistened
  • Canon PC940 | Service Manual - Page 270
    TROUBLESHOOTING II. STANDARDS AND ADJUSTMENTS A. Mechanical 1. Copier a. Leading Edge Non-Image Width Make adjustments so that the leading edge non-image width is 2.0 ±1.5 mm when the Test Sheet is copied 11-201 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU
  • Canon PC940 | Service Manual - Page 271
    11 TROUBLESHOOTING b. Image Leading Edge Margin (registration activation timing) Make adjustments so that the leading edge margin is 2.5 ±1.5 mm when the Test Sheet is copied. Caution 11-202 11-6 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 272
    TROUBLESHOOTING c. Adjusting the Mirror Position (optical length between No. 1 mirror and No. 2 mirror) If you have replaced the scanner drive cable, you must adjust the mirror position, by changing the position of the cable retainer of the No. 1 mirror mount. Reference: 1. As more and more copies
  • Canon PC940 | Service Manual - Page 273
    CHAPTER 11 TROUBLESHOOTING 4) Turn the cable drive pulley [3] so that the three shafts [2] of the mirror positioning tool for the front and the rear may be arranged as shown. [2] [3] [2] Figure 11-207 (rear) [2] [2] Figure 11-208 (front) 11-8 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV
  • Canon PC940 | Service Manual - Page 274
    CHAPTER 11 TROUBLESHOOTING 5) While keeping the condition of 4), tighten the positioning screw at the rear and the front of the No. 1 mirror mount [1]. [1] Figure 11-209 (rear) [1] Figure 11-210 (front) COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON
  • Canon PC940 | Service Manual - Page 275
    of the spring using a spring gauge (CK-0054), and replace the spring if it is not as indicated: Standard: 970 ±150 g Making Measurements Push the spring gauge against the middle of the spring as shown, and check to make sure that the reading of the spring gauge is 970 ±150 g when the
  • Canon PC940 | Service Manual - Page 276
    e-1. Routing the Scanner Drive Cable CHAPTER 11 TROUBLESHOOTING Wind 1.5 times. (black cable) Wind 7.5 times. (silvercolored cable) Figure 11-212 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 11-11
  • Canon PC940 | Service Manual - Page 277
    CHAPTER 11 TROUBLESHOOTING e-2. Routing the Scanner Drive Cable 1. Before Starting the Work Prepare the following: • Mirror positioning , J131) [1] from the DC controller PCB. 11-12 [1] Figure 11-214 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 278
    CHAPTER 11 TROUBLESHOOTING 5) If the machine is equipped with an ADF, free the hook [2], and disconnect the two relay connectors [3] from the left upper stay [4]. [3] [2] [2] [4] [2] [2] [3] Figure 11-215 6) Remove the three screws [5], and detach the left upper
  • Canon PC940 | Service Manual - Page 279
    CHAPTER 11 TROUBLESHOOTING 7) Remove the four screws [7], and detach the lens cover [8]. [7] [7] [8] Figure 11-217 11-14 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 280
    CHAPTER 11 TROUBLESHOOTING 2. Routing the Reversing Cable 1) Wind the reversing cables (silver-colored) [2] on the [2] Face with a marking Figure 11-218 [1] [3] [3] Top view Figure 11-219 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 11-15
  • Canon PC940 | Service Manual - Page 281
    CHAPTER 11 TROUBLESHOOTING 2) Put the cable drive pulley [1] into the shaft [4], and secure it in position with Figure 11-220 3) Hook the shorter end [6] on the pulley [7]. [7] [6] Figure 11-221 11-16 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 282
    CHAPTER 11 TROUBLESHOOTING 4) Lead the shorter end [6] under the No. 1 mirror mount [8] and the No. 2/3 mirror mount [9]; then, and the tip of the cable matches. [13] [12] [6] Figure 11-223 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 11-17
  • Canon PC940 | Service Manual - Page 283
    CHAPTER 11 TROUBLESHOOTING 6) Lead the longer end [14] along the cable drive pulley, and hook it on the pulley [15] on the [17] of the No. 2/3 mirror mount. [17] [8] [16] [14] [9] Figure 11-225 11-18 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 284
    CHAPTER 11 TROUBLESHOOTING 8) Hook the longer cable [14] on the cable hook [18]; then, secure its end to the left side plate and the tip of the cable matches. [18] [19] [14] Figure 11-226 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 11-19
  • Canon PC940 | Service Manual - Page 285
    CHAPTER 11 TROUBLESHOOTING 3. Routing the Forwarding Cable 1) Fit the longer end forwarding cable (black) [2] on the top the pulley [6] on the right front side. [1] [5] [6] Figure 11-228 11-20 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 286
    , and lead it between the No. 1 mirror mount [7] and the scanning lamp [9]. [8] [7] [9] [5] Figure 11-229 4) Hook the end of the longer end [5] on the hole [10] on the right side. [10] [5] Figure 11-230 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON
  • Canon PC940 | Service Manual - Page 287
    CHAPTER 11 TROUBLESHOOTING 5) Free the shorter end [3], and hook it on the pulley [11] on , lead it between the No. 1 mirror mount [7] and the scanning lamp [9]. [12] [3] [9] [7] Figure 11-232 11-22 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 288
    CHAPTER 11 TROUBLESHOOTING 7) Hook the end of the shorter end [3] on the hole [13] on the right side. [3] [13] Figure 11-233 8) Free the shorter end [3] and the longer end [5] (reversing cable), and connect both with a spring [14]; then, fit the stopper [15]. [3] [14] [15] [5] Figure 11-234
  • Canon PC940 | Service Manual - Page 289
    CHAPTER 11 TROUBLESHOOTING 9) Detach the pulley clip [16] from the cable drive pulley [1]. [1] [16] Figure 11-235 11-24 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 290
    CHAPTER 11 TROUBLESHOOTING 4. Positioning the No. 1 Mirror Mount 1) Fix the rear and the front of the No. 1 mirror mount [1] temporarily to the metal fixing [2] of the forwarding cable. [1] [2] Figure 11-236 (rear) [2] [1] Figure 11-237 (front) COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0
  • Canon PC940 | Service Manual - Page 291
    CHAPTER 11 TROUBLESHOOTING 2) Turn the cable drive pulley [4] so that the three shafts [3] of the mirror positioning tool for rear and front is as shown. [3] [4] [3] Figure 11-238 (rear) [3] [3] Figure 11-239 (front) 11-26 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED
  • Canon PC940 | Service Manual - Page 292
    CHAPTER 11 TROUBLESHOOTING 3) While keeping the condition of step 2), tighten the positioning screw on the rear and front of the No. 1 mirror mount [1]. [1] Figure 11-240 (rear) [1] Figure 11-241 (front) COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU
  • Canon PC940 | Service Manual - Page 293
    45˚ (approx.) Figure 11-242 Caution: • If you have replaced the scanning lamp, you must adjust the intensity of the lamp (p. 11-42) and perform AE adjustment. • Do not touch the lamp when handling it. 11-28 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU
  • Canon PC940 | Service Manual - Page 294
    TROUBLESHOOTING g. Points to Note When Mounting the Fuse When mounting the thermal fuse of the No. 1 mirror mount, be sure that the fuse is oriented as shown. Make sure that the fuse is in contact with the reflecting plate. Reflecting plate (front) Thermal fuse Figure 11-243 COPYRIGHT © 1999 CANON
  • Canon PC940 | Service Manual - Page 295
    paper, and draw two lines as indicated. • The sheet will be used as a test sheet. 10mm A4/LTR copy papper Figure 11-244 2) Turn on the machine, and place the test sheet prepared in step 1) on the original tray. 10mm Figure 11-245 11-30 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG
  • Canon PC940 | Service Manual - Page 296
    TROUBLESHOOTING 3) Press the Copy Start key to make a copy. 4) Check to make sure that the difference between L1 and L2 on the copy is 1.8 mm (standard) or less. L1 L2 280mm Copy Table 11-203 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 297
    paper, and draw two lines as indicated. • The sheet will be used as a test sheet. 10mm A4/LTR copy papper Figure 11-248 2) Remove the original tray cover from below the original tray. Original tray cover Figure 11-249 11-32 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED
  • Canon PC940 | Service Manual - Page 298
    CHAPTER 11 TROUBLESHOOTING 3) Turn on the machine, and place the test sheet prepared in step 1) on the original tray. Figure 11-250 4) Press the Copy Start key to make a copy. 5) Check to make sure that the distance L3 on the copy image indicated is 10 ±2.5 mm (standard) or less. L3 Copy image L3=10
  • Canon PC940 | Service Manual - Page 299
    CHAPTER 11 TROUBLESHOOTING 6) If the distance is not as specified, loosen the pinion gear positioning screw under the and L3 Direction of pinion gear A B L3 Increases Decreases Table 11-204 11-34 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 300
    paper, and draw two lines as indicated. • The sheet will be used as a test sheet. 10mm A4/LTR copy papper Figure 11-253 2) Remove the screw, and remove the ADF controller cover. Screw ADF controller cover Figure 11-254 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN
  • Canon PC940 | Service Manual - Page 301
    CHAPTER 11 TROUBLESHOOTING 3) Turn on the machine, and place the test sheet prepared in step 1) on the original tray. Figure 11-255 4) Press the Copy Start key to make a copy. 5) Check to make sure that the distance L4 on the copy image indicated is 10 +2.0, -2.5 mm (standard) or less. L4 Copy image
  • Canon PC940 | Service Manual - Page 302
    on the ADF controller PCB to ON, and place an A4 or LTR white copy paper on the original tray. 3456 ON 12 BCD EF 0 1 2 ON 12 11-257 7) Press the push switch (PSW) on the ADF controller PCB. • The copy paper will be picked up from the original tray and stopped on the copyboard glass. PSW 3456
  • Canon PC940 | Service Manual - Page 303
    switch by a single notch changes the original stop position by about 0.3 mm. Press the push switch (PSW) after deciding on a position to discharge the copy paper and store the optimum value. -205 11-38 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU
  • Canon PC940 | Service Manual - Page 304
    (PSW) to pick up the copy paper. 3456 ON 12 BCD EF 0 1 2 6 7 8 9A 7 8 9A ON 12 SW1 Figure 11-260 3) Turn the rotary switch (SW2) on the ADF controller PCB clockwise by 10 notches. 345 ON 12 BCD EF 0 1 2 SW2 Figure 11-261 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 305
    the push switch (PSW) on the ADF controller PCB. • The copy paper on the copyboard will be discharged, and the optimum value will be stored. PSW 3456 ON 12 BCD EF 0 1 2 7 8 9A Figure 11-262 11-40 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU
  • Canon PC940 | Service Manual - Page 306
    CHAPTER 11 TROUBLESHOOTING C. Electrical 1. After Replacing the Major Parts Parts Scanning lamp AE sensor PCB Composite power supply PCB*1 DC controller PCB ADF controller PCB Adjustment 1. Intensity of the scanning lamp 2. AE mechanism 1. AE mechanism (1. Intensity of the scanning lamp) (2. AE
  • Canon PC940 | Service Manual - Page 307
    of the scanning lamp if you have replaced any of the following: • DC controller PCB • Composite power supply PCB (See p.11-41.) • Scanning lamp Caution: If you have performed this adjustment, you must always perform AE adjustment. Making Adjustments 1) Set a cartridge in the machine. 2) Set the
  • Canon PC940 | Service Manual - Page 308
    text.) • Obtain five sheets of white sheets of paper. • Be sure that the intensity of the scanning lamp has been adjusted when you have replaced the scanning lamp. • Set the density correction switch (SW101) to the middle setting. If the machine is not equipped with a density correction switch, set
  • Canon PC940 | Service Manual - Page 309
    VR102 Figure 11-267 7) Remove the newspaper from the copyboard, and place five sheets of copy paper in its place; then, close the copyboard cover. 8) Turn VR103 on the DC controller 11-268 11-44 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 310
    , turn VR103 fully counterclockwise, and go back to step 5) and make adjustments once again. 10) Make a copy, and check to make sure that it is free of fogging and its text is adequately dark. • If the copy is foggy or its text is too light, go back to step 1) and start over. • If
  • Canon PC940 | Service Manual - Page 311
    11 TROUBLESHOOTING 4. Adjusting the Reproduction Ratio (fine adjustment) Adjust the reproduction ratio if you have replaced the following: • DC controller PCB Making Adjustments Before Starting the Work • Meter 1) Before replacing the DC controller PCB, turn on the power; then, connect the meter
  • Canon PC940 | Service Manual - Page 312
    CHAPTER 11 TROUBLESHOOTING 5. Checking the Photointerrupters 1) Set the meter range to 12 VDC. 2) Connect the - probe to GND (CPGND1) on the DC controller PCB. GND VR104 VR105 VR106 VR107 CP23 CPGND1 Figure 11-271 3) Make checks as instructed. Reference: The photointerrupers other than those shown
  • Canon PC940 | Service Manual - Page 313
    sun. (As necessary, instruct the user to provide curtains.) e. The site must be well ventilated. f. The machine must be kept level. 2. Checking the Originals Check the originals to find out whether the problem in question is caused by the machine or the originals. a. The copy density adjusting lever
  • Canon PC940 | Service Manual - Page 314
    the cartridge back into the machine, and make copies. • If the copies are normal, You may continue to use the cartridge, but the user must know that it must be replaced with a new cartridge soon. • If the copies are not normal, Replace the new cartridge. COPYRIGHT © 1999 CANON INC. CANON PC800s
  • Canon PC940 | Service Manual - Page 315
    of the manual feed assembly will reduce friction, causing pickup faults. If condensation is noted, dry wipe the parts in question. The cartridge can develop condensation if it is opened immediately after it has been brought from a cold to warm place. Instruct the user so that the cartridge is not
  • Canon PC940 | Service Manual - Page 316
    CHAPTER 11 TROUBLESHOOTING COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 11-51
  • Canon PC940 | Service Manual - Page 317
    NOTE: The samples are created intentionally. The NA-3 Test Sheet was copied in the direct mode in A3 and printed with a reduction of about 19%; actual images may be somewhat different. 11-562 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 318
    fixing assembly. Is it 0Ω? Replace the cartridge. Is the problem corrected? YES/NO YES NO NO YES YES NO YES NO Action End. Go to step 6. 1. Mount the transfer charging roller correctly. 2. Replace the transfer charging roller. 1. The copy paper may be moist. Instruct the user on the correct method
  • Canon PC940 | Service Manual - Page 319
    , and mirror. Is the problem corrected? Turn off the power in the middle of a copying run, and open the machine. Is the toner image on the photosensitive drum before transfer more or less uneven? YES/NO Action YES End. YES 1. Replace the cartridge. 2. Replace the scanning lamp. NO 1. Mount the
  • Canon PC940 | Service Manual - Page 320
    TROUBLESHOOTING 7 The copy is foggy vertically. 8 The copy has black lines. (vertical, fuzzy, thick) 9 The copy has black lines. (vertical, fine) Cause Scanner Transfer guide assembly Cartridge Step 1 2 Checks Clean the scanning lamp, reflecting plate, lens, and mirror. Is the problem corrected
  • Canon PC940 | Service Manual - Page 321
    ? Scanner rail 3 Is the problem noted at the same position on all copies? Scanning lamp, Developing bias YES/NO YES YES Yes NO Action Try a recommend type. If the results are good, ask the user to use a recommended type. The paper may be moist. Instruct the user on the correct method of storing
  • Canon PC940 | Service Manual - Page 322
    plate VR104 Solenoid (SL2), DC controller PCB Copy paper Registration clutch Step 1 2 3 4 5 Checks Make copies using the cassette and manually. Are the results the same? YES/NO NO Action Check the pickup roller, pickup clutch, and cassette. Or, replace them. Are the scanner home position sensor
  • Canon PC940 | Service Manual - Page 323
    11 TROUBLESHOOTING 18 The copy has a blurred image. Cause Scanner drive cable Scanner rail Feeding system Cartridge lamp flicker? Replace the cartridge. Is the problem corrected? Scanning system Feeding system 3 Make a reduced copy, and compare it against one made in Direct. Is the problem
  • Canon PC940 | Service Manual - Page 324
    the No. 2 mirror. End. Replace the cartridge. 21 The copy is blank. Cause Cartridge Drum drive assembly High-voltage transformer Primary high-voltage charging terminal, cartridge Step 1 2 3 4 5 6 Checks Is the cartridge set in the machine? Does the cartridge have toner? Has the open seal been
  • Canon PC940 | Service Manual - Page 325
    CHAPTER 11 TROUBLESHOOTING 22 The copy is solid black. Cause Step 1 Checks Does the scanning lamp remain on during copying? YES/NO NO YES Action See "The scanning lamp fails to turn on." Is the cartridge set correctly? 11-60 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999
  • Canon PC940 | Service Manual - Page 326
    See the instructions given for the respective error code. End. JP102 JP101 JP102 JP101 Figure 11-401 2) While keeping the condition in step 1), turn on the power switch. 3) Is an error code indicated in response to a press on the Copy Start key? COPYRIGHT © 1999 CANON INC. CANON PC800s/900s
  • Canon PC940 | Service Manual - Page 327
    CHAPTER 11 TROUBLESHOOTING 2 E000 Cause Thermistor (TH1) Heater problem corrected? YES/NO NO YES Action Correct the connection of J102 on the DC controller PCB and the wiring to the thermistor (TH1). End. YES End. NO Replace the DC controller PCB. 11-62 11-62 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 328
    11 TROUBLESHOOTING 4 -2 (-) on the main motor drive PCB about 24 V? Replace the main motor (M1). Is the problem corrected? YES/NO NO NO NO YES NO Action Correct to turn on." End. Replace the DC controller PCB. COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN
  • Canon PC940 | Service Manual - Page 329
    between the composite power supply PCB and the high-voltage contact PCB. Correct the highvoltage contacts of the machine's top and bottom units. Replace the transfer charging roller. Replace the cartridge. Is the problem corrected? YES End. Does the high-voltage cable have scratches or tears
  • Canon PC940 | Service Manual - Page 330
    PCB DC controller PCB Step 1 2 Checks Does the scanning lamp turn on when the Copy Start key is pressed? Replace the composite power supply PCB. Is the problem corrected? YES/NO NO YES Action See "The scanning lamp fails to turn on." End. NO Replace the DC controller PCB. 10 E240 Cause Wiring
  • Canon PC940 | Service Manual - Page 331
    3 Replace the ADF controller PCB. Is the problem corrected? YES End. NO Replace the copier's DC problem corrected? Replace the DC controller PCB. Is the problem corrected? YES/NO Action YES End. YES End. NO Replace the composite power supply PCB. 11-66 11-66 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 332
    the door switch (DS1), and connect the meter probes to F1 and F3 or F2 and machine's top unit. Inform the user that the problem is not the machine's. Remove the cause, and replace the fuse. YES Remove the cause of the problem, and replace the fuse. NO Replace the door switch (DS1). NO Replace
  • Canon PC940 | Service Manual - Page 333
    power supply PCB blown? 120V model: 125 V, 5 V 220/240V model: 250 V, 2.5 A YES Remove the cause of the problem, and replace the fuse. NO Replace the composite power supply PCB. 11-68 11-68 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 334
    voltage change to about 24 V in keeping with pickup operation? YES/NO NO NO NO NO Action See "The main motor fails to rotate." Set the cassette correctly. Instruct the user on the correct method of placing paper. Check the wiring from the solenoid to the DC controller PCB; if normal, replace the
  • Canon PC940 | Service Manual - Page 335
    on the correct way of operating the machine. See "The main motor fails to rotate." Instruct the user on the correct way of placing paper. Check the wiring from the solenoid to the DC controller PCB; if normal, replace the solenoid in question. Replace the DC controller PCB. 18 Pickup fails. (single
  • Canon PC940 | Service Manual - Page 336
    on the composite power supply PCB. Is the meter reading about 24 V? Is the pre-registration roller paper sensor (Q751) normal? (For instructions on how to check the photointerrupers, see p. 11-47.) Replace the scanner/lens drive motor (M2). Is the problem corrected? YES/NO NO NO NO NO YES Action
  • Canon PC940 | Service Manual - Page 337
    CHAPTER 11 TROUBLESHOOTING 21 The blanking lamp fails to turn on. Cause Side blanking PCB DC controller PCB Step 1 Checks Remove J106 from the DC control PCB, and set the meter range to 1 kΩ; then, connect the meter probes to J106-1 and -2 on the harness side. Is the meter reading about 20 Ω?
  • Canon PC940 | Service Manual - Page 338
    Scanner/lens drive motor (M2) DC control PCB 3 Set the meter range to the 30 VDC, and connect J202-2 (+) and -1 (-) on the composite power supply PCB. Is the meter reading about 24 V? 4 Replace the scanner/lens drive motor (M2). Is the problem corrected? YES/NO NO NO NO Action Check the wiring
  • Canon PC940 | Service Manual - Page 339
    J202-2 (+) and -1 (-) on the composite power PCB. Is the meter reading about 24 V? Is the vertical path roller paper sensor (PS4) normal? (For instructions on how to check the photointerrupters, see p. 11-47.) Replace the control panel PCB. Is the problem corrected? YES/NO NO NO NO Action Set the
  • Canon PC940 | Service Manual - Page 340
    A. Copy Paper Jam Inside the machine, jams tend occur in the following blocks: [1] Pickup block [2] Separation/feeding block [3] Fixing/delivery block The troubleshooting procedures that follow are organized according to the location of a jam. [3] [2] [1] Figure 11-501 COPYRIGHT © 1999 CANON
  • Canon PC940 | Service Manual - Page 341
    source (cassette, manual feeder) rotate during a copying run? Does the registration roller operate normally? Does the vertical path roller paper sensor operate normally? YES/NO Action NO Go to step 5. NO Set the cassette correctly. YES Replace the copy paper. Instruct the user on the correct
  • Canon PC940 | Service Manual - Page 342
    CHAPTER 11 TROUBLESHOOTING 2 Separation/Feeding Assembly Cause Copy paper Feeding assembly Step 1 2 3 Checks Try paper recommended by Canon. Is the problem corrected? Is the copy paper curled, wavy, or otherwise deformed? Is there foreign matter in the feeding assembly? Feed belt, Roller Static
  • Canon PC940 | Service Manual - Page 343
    4 Checks Turn off the power while copy paper is moving through the feeding assembly. Is the copy paper wrinkled or found askew? Try fresh paper. Is the problem corrected? Try paper of a type recommended by Canon. Is the problem corrected? Is the inlet guide soiled with toner? YES/NO YES YES YES NO
  • Canon PC940 | Service Manual - Page 344
    -registration roller paper detection Remarks Single-feeder type only Solenoid SL1 Pickup clutch solenoid SL2 Registration clutch solenoid SL3 Lens solenoid SL4 Multifeeder pickup solenoid SL5 Cassette pickup solenoid Multifeeder type only COPYRIGHT © 1999 CANON INC. CANON PC800s/900s
  • Canon PC940 | Service Manual - Page 345
    CHAPTER 11 TROUBLESHOOTING B. Switches DS1 SW309 SW101 Symbol Name Switch Switch Figure 11-602 Notation Description DS1 Door switch SW309 Power switch SW101 Density correction switch Remarks 11-80 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (
  • Canon PC940 | Service Manual - Page 346
    FU2 Varistor VZ1 VZ2 Fixing heater temperature detection Scanner temperature detection Lamp overheating detection Fixing heater overheating detection Fixing film varistor Transfer guide varistor COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON
  • Canon PC940 | Service Manual - Page 347
    lamp. Makes an electrical connection between the machine top and bottom. Provides copying insurrections/indications. Detects paper in front of the registration roller. Detects the density of originals. Used for blanking exposure. Used for blanking exposure. 11-82 COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 348
    detection Registration roller paper detection Original placement detection Microswitch MS1 ADF open/close switch Motor M1 Belt motor M2 Pickup motor ADF controller PCB Controls sequence of operations Remarks COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN
  • Canon PC940 | Service Manual - Page 349
    CHAPTER 11 TROUBLESHOOTING F. Variable Resistors (VR) and Check Pins by PCB Of the variable resistors (VR) 1 4 1 6 J202 1 J203 8 1 J2047 J209 VR801 VR301 J302 J213 J212 Figure 11-607 11-84 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 350
    CHAPTER 11 TROUBLESHOOTING 3. ADF Controller PCB FACE 1 J5 9 1 J2 8 10 TP1 1 7 J3 1 4 J1 1 CB1 21 J6 Figure 11-608 Soldered side ON 12 PSW SW1 SW2 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 11-85
  • Canon PC940 | Service Manual - Page 351
    TROUBLESHOOTING VII. SELF DIAGNOSIS The microprocessor on the machine's DC controller PCB is equipped with a self diagnostic mechanism that checks the condition of the machine (particularly, sensors) and indicates an error code an error ('E000', 'E001 after the Copy Start during copy operation and
  • Canon PC940 | Service Manual - Page 352
    TROUBLESHOOTING Code without error code indication faulty. • The scanning lamp (LA1) is faulty. copier is interrupted for 5 sec or more; the communication is monitored at all times. • During a copying run, the +24 V power deviates from the control value by ±20%. COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 353
    CHAPTER 11 TROUBLESHOOTING Caution: 1. If the self-diagnosis has turned on, turn off the power switch to reset the machine. In the case of 'E000', 'E001', 'E002', or 'E003', however, the machine must be reset as follows: this consideration is to prevent feeding power to the fixing heater otherwise
  • Canon PC940 | Service Manual - Page 354
    A-30 J. NOISE FILTER CIRCUIT DIAGRAM A-31 K. HIGH VOLTAGE CONTACT CIRCUIT DIAGRAM A-32 L. BLANK EXPOSURE (front) CIRCUIT DIAGRAM A-33 M. BLANK EXPOSURE (rear) CIRCUIT DIAGRAM A-34 N. SPECIAL TOOLS A-35 O. SOLVENTS/OILS A-36 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999
  • Canon PC940 | Service Manual - Page 355
  • Canon PC940 | Service Manual - Page 356
    (SL3) 6 Pickup clutch solenoid (SL1) 7 Cassette pickup solenoid (SL5) 8 Vertical path roller paper sensor (PS4) 9 Registration clutch solenoid (SL2) 10 Pre-registration roller paper sensor (Q751) 11 Scanning lamp (LA1) 12 Primary AC bias 13 Primary DC bias 14 Developing AC bias 15
  • Canon PC940 | Service Manual - Page 357
    path roller 8 paper sensor (PS4) 9 Registration clutch solenoid (SL2) 10 Copier Pre-registration roller paper sensor (Q751) 11 Scanning lamp (LA1) 12 Primary (reverse) / Belt motor (reverse) COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 358
    a list of signals and abbreviations used in the chapters of the manual and circuit diagrams. ERROR signal FIXING HEATER OFF signal FIXING HEATER DUTY signal FIXING HEATER DRIVE signal LAMP ACTIVATION DETECTION signal SCANNING LAMP REGISTRATION ROLLER PAPER DETECTION signal SIDE BLANK EXPOSURE LAMP ON
  • Canon PC940 | Service Manual - Page 359
    A-4 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 360
    Vertical path roller paper sensor COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) J751 3 2 1 Q751 Pre-registration roller paper sensor SENSOR PCB M 12 12 J601 J602 M2 Scanner/lens drive motor SIDE BLANK EXPOSURE PCB 1 2 3 4 5 6 7 8 9 10 11
  • Canon PC940 | Service Manual - Page 361
    ADFC OR OR NO COM (M4) ADF MS1 Switch J3 OR GN Y V GY W OR M1 Pickup motor M1 Belt motor 54321 54321 1234567 1234567 Color coding BK BLACK BL BLUE BR BROWN GY GRAY GN GREEN OR ORANGE PK PINK R RED SB SKY-BLUE V VIOLET W WHITE Y YELLOW COPYRIGHT © 1999
  • Canon PC940 | Service Manual - Page 362
    C104 DIGIT D_L_1 RG_PD_CPU LS_HP_CPU ZER_CRS_EDGE 76543210 D. DC CONTROLLER CIRCUIT DIAGRAM DC Controller Circuit Diagram (1/8) 8 AD +5V C191 Q101 MD2 75 MD1 74 MD0 KEY ADF type only COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU
  • Canon PC940 | Service Manual - Page 363
    DC Controller Circuit DIagram (2/8) SC_I_SEL3 SC_I_SEL1 SC_I_SEL2 +5V Q165 Q112 2 3 Q155 1 R277 R117 R267 +5V R115 R114 R113 + 5V R109 C108 SC_COM SC_B SC_B* SC_A SC_A* C166 C165 C164 C163 A-8 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 364
    DC Controller Circuit Diagram (3/8) 13 21 +5V R119 2 VR102 R118 R265 +24VR 23+ 8 1 4 Q106 R266 C184 AEREF AE R120 +5V R264 VR103 13 2 C155 +24VR R121 65+ C111 8 7 4 Q106 R206 ZD101 AE_DATA C185 R263 C186 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN
  • Canon PC940 | Service Manual - Page 365
    DC Controller Circuit Diagram (4/8) KEY 8 0 R134 1 R133 2 R132 3 R131 4 R130 5 R129 6 R128 7 R127 8 12 D113 12 D218 12 D109 12 D108 12 D106 12 D115 KR6 [CPM1] 12 D114 HEAT0 HEAT1 SERVICE SFPD DPD CDP DIG0 DIG1 10CPM 12/13CPM D114 KR2 [SIZE0] KR5 [SIZE1] 12 D103 12
  • Canon PC940 | Service Manual - Page 366
    21 D118 R140 C123 R139 1 +2 JP102 E0_DT DC Controller Circuit Diagram (5/8) 13 +5V R278 VR104 2 RGAD_VR R294 13 +5V R279 4 +5V C167 R275 C183 +5V R158 ZER_CRS_EDGE 2 3 Q131 1 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4 SW101 3
  • Canon PC940 | Service Manual - Page 367
    DC Controller Circuit Diagram (6/8) LNSLD PUSLD RGSLD MFSLD FM1D CPUSD SB_ON R165 R162 R161 R166 R352 R353 R160 2 3 1 Q145 2 3 1 Q144 2 3 1 * LHP SCHP PDP RG_PD_CPU C128 R170 R249 RPD COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 368
    DC Controller Circuit Diagram (7/8) POWER_OFF* HEAT_ERR* COMP_CLR D184 Q158 D185 +5V R189 2 3 Q146 1 R188 C142 +5V 1 3 2 Q147 R190 HEAT_OFF HEAT_PWM 21 D132 21 D133 2 3 Q148 1 HEAT_TRG COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) A-13
  • Canon PC940 | Service Manual - Page 369
    DC Controller Circuit Diagram (8/8) +5V +5V R363 J131 2 J131 CDP DIG3 RPD C267 1 J108 2 J108 3 J108 +5V 4 J108 5 J108 DIG2 SERVICE JP103 JP104 1 TP102 1 TP103 1 TP101 REQ ACK TXD RXD ADF type only 1 J114 2 J114 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 370
    DIGIT1 DIGIT0 DIPSW1 DIPSW0 D7 D6 D5 D4 D3 D2 D1 D0 E. ADF CONTROLLER CIRCUIT DIAGRAM ADF Controller Circuit Diagram (1/3) 8 76543210 16 48 A0 0 P10/A0 47 A1 1 P11/A1 46 A2 +5V C10 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) A-15
  • Canon PC940 | Service Manual - Page 371
    ADF Controller Circuit Diagram (2/3) TP1 B* 4 TP1 A 1 TP1 A* 2 TP1 B 3 TP1 NC 5 TP1 10 +5V R8 R12 C13 R9 R14 OUT2 OUTA OUTA* 7 J3 6 J3 GND Q5 +5V R16 1 J7 Q8 LED 2 J7 A-16 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 372
    J5 +5V R28 R27 R26 R25 DIGIT0 DIGIT1 DIGIT2 DIGIT3 SW2 1 5 2 4 8 ADF Controller Circuit Diagram (3/3) REQ ACK RXD TXD DIPSW1 DIPSW0 PSW +5V HC14 2 1 Q6 Q9 D2 R31 R29 R30 C19 13 Q6 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) A-17
  • Canon PC940 | Service Manual - Page 373
    A-18 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 374
    F. COMPOSITE POWER SUPPLY CIRCUIT DIAGRAM Composite Power Supply Circuit Diagram [A502] (1/8) J201 1 AC_H AC_INPUT AC_N 2 RL601 D603 R606 +5V SQ600 L600 AC_H_AF AC_N_AF COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) A-19
  • Canon PC940 | Service Manual - Page 375
    Composite Power Supply Circuit Diagram [A503] (2/8) AC_H_AF AC_N_AF C151 L103 C156 C157 FB104 FU102 LOW_G HV_H HV_L MV_H MV_L R114 A-20 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 376
    Composite Power Supply Circuit Diagram [A504] (3/8) T101 TIM 24VOFF 16 13 LOW_G
  • Canon PC940 | Service Manual - Page 377
    Composite Power Supply Circuit Diagram [A505] (4/8) MV_H R202 10 9 MV_L T101 C201 R209 R203 1 4 2 + C510 C538 C513 C512 R549 + C611 JP202 R521 PRIMARY J209 R592 A-22 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 378
    Composite Power Supply Circuit Diagram [A506] (5/8) C210 C212 C214 D211 D206 D207 D208 D209 D210 T101 12 R243 D215 C215 BIAS_S J215 J212 DEVELOPING R225 R254 J213 SEPARATION COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) A-23
  • Canon PC940 | Service Manual - Page 379
    Composite Power Supply Circuit Diagram [A507] (6/8) T_FEEDBACK VR301 R361 C377 R318 R327 C359 D306 +24VR T_FW_DRV D308 C382 T_REV T_REV_R J210 Transfer output D328 C329 A-24 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 380
    Composite Power Supply Circuit Diagram [A508] (7/8) +5V C903 PAC_S 1 PAC_S Q901 +5V HV_LIMIT 2 +5FBT J204 1 2 3 4 5 6 7 PWOFF S_IN S_OUT S_CLK ZER_CRS HEAT_TRG MLOCK COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) A-25
  • Canon PC940 | Service Manual - Page 381
    Composite Power Supply Circuit Diagram [A509] (8/8) R027 R006 R012 R013 R020 R021 + R008 R018 C001 43 Q001 21 34 R016 + C005 Q011 LAMP_ON PWM_1KHz LAMP_DETECT A-26 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 382
    + SW302 CLR SW306 COPY SW303 ZOOM SW307 AE C303 SW304 PRESET COPY RATIO SW308 CASSETTE/MULTI G. CONTROL PANEL CIRCUIT DIAGRAM a2 a3 b1 f2 J301 11 SEG6 R307 J301 12 SEG7 R308 ADF type only COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 383
  • Canon PC940 | Service Manual - Page 384
    H. AE SENSOR CIRCUIT DIAGRAM APPENDIX PD601 R601 C603 +24VR 2 8 1 3+ 4 Q601 R603 R606 R602 +24VR C601 J601-1 R605 J601-2 +24VR 8 7 Q601 4 6 +5 C602 R604 J601-3 J601-4 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) A-29
  • Canon PC940 | Service Manual - Page 385
    APPENDIX I. SENSOR CIRCUIT DIAGRAM Q751 R751 +5V J751-2 RPD J751-3 GND J751-1 A-30 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 386
    J. NOISE FILTER CIRCUIT DIAGRAM APPENDIX JP502 AC_H JP501 AC_N FU501 R501 C501 L501 C502 C503 FG C504 J501-1 J501-2 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) A-31
  • Canon PC940 | Service Manual - Page 387
    APPENDIX K. HIGH VOLTAGE CONTACT CIRCUIT DIAGRAM JP701 1 2 1 2 JP702 JP703 1 2 1 2 JP704 JP705 1 2 1 2 JP706 JP707 1 2 1 2 JP708 JP709 1 BP706 2 R703 1 [DV_IN] BP707 A-32 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 388
    APPENDIX L. BLANK EXPOSURE (front) CIRCUIT DIAGRAM LA601 2 J601 1 J601 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) A-33
  • Canon PC940 | Service Manual - Page 389
    APPENDIX M. BLANK EXPOSURE (rear) CIRCUIT DIAGRAM LA602 2 J602 1 J602 A-34 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 390
    tool(s) in addition to the standard tools set when servicing the machine. No Tool 1 Mirror position- ing tool (pair service person is expected to carry one. B: Each five or so service persons is expected to carry one. C: Each workshop is expected to carry one. COPYRIGHT © 1999 CANON INC. CANON
  • Canon PC940 | Service Manual - Page 391
    metal; oil or toner dirt 3 Lubricating oil Lubricating spring clutch 4 Lubricating oil Lubricating drive and friction parts, scanner rail Hydrocarbon . • CK-0451 (100cc) • CK-0551 (20g) A-36 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 392
    Prepared by Office Imaging Products Technical Support Division CANON INC. Printed in Japan REVISION 0 (AUG. 1999) (30359/10317) 5-1, Hakusan 7-chome, Toride-shi, Ibaraki 302-8501 Japan COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC940 | Service Manual - Page 393
    PRINTED IN JAPAN (IMPRIME AU JAPON) 0899AB2.135-1 This pubication is printed on 70% reprocessed paper.
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COPYRIGHT
©
1999
CANON INC.
CANON
PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
REVISION 0
FY8-13GA-000
AUG. 1999
PC860
F13-8491
TYA00001-
PC880
F13-8291
TZA00001-
PC890
F13-8242
UAA00001-
PC920
F13-8431
TVB00001-
F13-8441
PUD00001-
PUE00001-
F13-8461
PUH00001-
PC921
F13-8432
TVC00001-
PC940
F13-8436
TVD00001-
PC941
F13-8437
TVE00001-
PC950
F13-8231
TVF00001-
F13-8241
PUF00001-
PUG00001-
PC960
F13-8434
TVG00001-
PC980
F13-8232
TVH00001-
PC981
F13-8233
TVJ00001-