Canon PC921 Service Manual
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- Canon PC921 | Service Manual - Page 1
REVISION 0 PC860 F13-8491 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- - Canon PC921 | 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 PC921 | Service Manual - Page 3
, and shows how the machine may be installed using step-by-step instructions. Chapter 10 Maintenance and Servicing provides tables of periodically replaced parts and consumables/durables and scheduled servicing charts. Chapter 11 Troubleshooting provides tables of maintenance/inspection - Canon PC921 | Service Manual - Page 4
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 REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 5
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 item in question is available. Copying speed (cpm) at Direct 12 12 - Canon PC921 | Service Manual - Page 6
iv COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 7
Copier 1-2 B. ADF 1-8 III. NAMES OF PARTS 1-10 A. External View 1-10 B. Cross Section 1-13 IV. USING THE MACHINE 1-15 A. Control Panel 1-15 V. ROUTINE MAINTENANCE BY THE USER 3-31 C. Exposure System 3-37 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN - Canon PC921 | 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 PC921 | Service Manual - Page 9
Original Jams ..... 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 - Canon PC921 | Service Manual - Page 10
Faults ....... 11-52 C. Troubleshooting Image Faults 11-53 IV. TROUBLESHOOTING 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 - Canon PC921 | 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 PC921 | Service Manual - Page 12
- Canon PC921 | 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 PC921 | Service Manual - Page 14
Copier 1. Type Item Body Copyboard Source of light Lens Photosensitive medium 2. Mechanisms Item Reproduction Charging Exposure Copy OPC drum (24-mm dia.) Table 1-201 Descriptions Indirect static reproduction Roller (direct charging) Slit (moving light source) Auto or manual Dry (toner projection - Canon PC921 | Service Manual - Page 15
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, 3-D object (2kg max.) A4 (297 × 210 mm - Canon PC921 | 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 PC921 | Service Manual - Page 17
about 5min; reference only) Copying: 0.4kWh (approx.; reference only) Standby: -(sound power level by ISO) Copying: (sound power level by 24.0 kg*1/ 52.8 lb*1, 25.4 kg*2/ 55.9 lb*2 Copy paper: Keep wrapped, and protect against humidity. Toner: Avoid direct sunlight, and store at 40°C/104°F, 85% or - Canon PC921 | Service Manual - Page 18
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.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 19
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 PRINTED - Canon PC921 | 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 PC921 | Service Manual - Page 21
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 PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 1-9 - Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 25
] No. 6 mirror [11] Cartridge [12] No. 4 mirror [ 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 - Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 32
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 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 33
1 GENERAL DESCRIPTION The machine's image formation process consists 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 - Canon PC921 | Service Manual - Page 34
- Canon PC921 | Service Manual - Page 35
between electrical and mechanical systems, and timing at which each associated part is turned on. Process speed 96 mm/sec I. BASIC OPERATIONS 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 PC921 | Service Manual - Page 36
- Canon PC921 | 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 PC921 | Service Manual - Page 38
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 • Fixing thermistor Control panel Main motor Main driver PCB motor Solenoid • Pickup clutch solenoid • - Canon PC921 | Service Manual - Page 39
Basic Sequence of Operations • A4R, Direct, 2 Copies, Continuous, Cassette Power switch Copy Start key ON ON STBY INTR AER SCFW SCRV detection II : Lens home position detection Figure 2-103 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 2-3 - Canon PC921 | 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 PC921 | Service Manual - Page 41
drive parts Photosensitive drum, primary charging roller, developing assembly, transfer charging roller, pickup roller, vertical roller, registration roller, feeding drive PCB Figure 2-104 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 42
speed. While the main motor is rotating at a specific speed, the main motor driver PCB keeps sending the constant speed state signal (MLOCK=0) to the DC controller PCB. If the in the display. 2-6 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 45
roller Static eliminator HVT board M1 Main motor Main motor driver PCB Highvoltage circuit block +24V Microprocessor Communication with the composite 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 PC921 | Service Manual - Page 46
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 PC921 | 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 PC921 | Service Manual - Page 48
- Canon PC921 | Service Manual - Page 49
This chapter discusses the principles of operation used for the machine's lens drive unit and scanner drive unit. It also .... 3-13 B. Lens Drive Assembly ......... 3-31 C. Exposure System 3-37 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 50
- Canon PC921 | Service Manual - Page 51
) • 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 PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-1 - Canon PC921 | Service Manual - Page 52
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, the - Canon PC921 | Service Manual - Page 53
unit Reduction Enlargement Lens home position sensor (PS2) 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 (IMPRIME AU JAPON) 3-3 - Canon PC921 | Service Manual - Page 54
motor (M2), whose direction of rotation changes to move the scanner forward or in is moved varies according to the length of copy paper and the selected reproduction ratio. The scanner/ 3-104 Q109 Motor driver circuit DC controller PCB 3-4 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 - Canon PC921 | Service Manual - Page 55
signal. The forward movement distance of the scanner varies according to the length of copy paper and reproduction ratio. If the ratio is less than 130%, the scanner is moved , see p. 5-10. COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-5 - Canon PC921 | Service Manual - Page 56
Copying Speed The machine uses a halogen lamp for scanning, and the heat of the lamp increases the tempera- ture of the copyboard. To prevent possible overheating of the copyboard glass, the temperature of the scanner is monitored by a thermistor (TH2); if its reading copying roller paper sensor Copy - Canon PC921 | Service Manual - Page 57
24VU R399 J110 SC-COM SC-COM Microprocessor A A* B B* Current switching signal 1 Current switching signal 2 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 PC921 | Service Manual - Page 58
controller PCB receives instructions from the control panel PCB copying mode settings (e.g., reproduction ratio). In response, it applies drive pulses to the scanner/lens drive motor (M2) through the motor driver circuit. The scanner motor is a 4-phase stepping motor, and changes the direction and - Canon PC921 | Service Manual - Page 59
(LA1) Microprocessor Microprocessor VR107 DC controller PCB Activation detection signal LAMP_DETECT Rectifying circuit Activation detection circuit Composite power supply PCB Figure 3-201 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-9 - Canon PC921 | Service Manual - Page 60
lamp turns on. When LAMP_ON is '1', The phase control circuit turns off. The arcing circuit turns off. The scanning lamp turns off. 3-10 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 61
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 JAPON) 3-11 - Canon PC921 | Service Manual - Page 62
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 PC921 | Service Manual - Page 63
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) 3-13 - Canon PC921 | Service Manual - Page 64
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 INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 65
. 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/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-15 - Canon PC921 | 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 PC921 | Service Manual - Page 67
copyboard glass. (See Chapter 7.III.C.1."Removing the Copyboard Glass.") 4) Disconnect the connectors (J101, J131) [1] from the DC controller 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) 3-17 - Canon PC921 | 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 the left upper stay [4]. [2] [2] [3] Figure 3-309 [5] [5] [4] Figure 3-310 3-18 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | 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 PC921 | Service Manual - Page 70
top; then, secure it in position with a cable clip [3]. [1] Longer end Shorter 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 PC921 | Service Manual - Page 71
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 PC921 | Service Manual - Page 72
[14] along the cable drive pulley, and hook it on the pulley [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 PC921 | Service Manual - Page 73
the hole in the left side plate and the tip of the cable matches. [16] [14] [9] Figure 3-319 [18] [19] [14] Figure 3-320 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-23 - Canon PC921 | Service Manual - Page 74
Routing the Forwarding Cable [4] 1) Fit the longer end forwarding cable [3] (black) [2] on the top hook of the cable drive pulley [1], and wind 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 PC921 | Service Manual - Page 75
[12] of the No. 2/3 mirror mount as shown; then, lead it between the No. 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 JAPAN (IMPRIME AU JAPON) 3-25 - Canon PC921 | Service Manual - Page 76
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 3-328 3-26 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | 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 PC921 | Service Manual - Page 78
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/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 79
[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 JAPAN (IMPRIME AU JAPON) 3-29 - Canon PC921 | 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 PC921 | Service Manual - Page 81
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 PC921 | Service Manual - Page 82
to the marking made with a scriber. [3] Marking 6) Disengage the lever [5] 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 PC921 | Service Manual - Page 83
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] Figure 3-340 [10] Figure 3-341 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-33 - Canon PC921 | Service Manual - Page 84
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 PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 85
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 the No. 1 mirror mount [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 PC921 | Service Manual - Page 86
; then, mount the cam gear once again so that 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 PC921 | Service Manual - Page 87
the reflecting plate. CHAPTER 3 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 PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU - Canon PC921 | Service Manual - Page 88
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. , dry wipe it. [6] [7] Figure 3-349 3-38 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 89
is as shown. Caution: • Do not touch the lamp portion. • If you have replaced the scanning lamp, be sure to perform intensity adjustment (p. 11-42) and AE adjustment (p. 45 (approx.) Figure 3-350 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-39 - Canon PC921 | Service Manual - Page 90
oriented as shown. Make sure that the fuse is in contact with the reflecting 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 PC921 | Service Manual - Page 91
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 PC921 | Service Manual - Page 92
- Canon PC921 | Service Manual - Page 93
the Density of Originals 4-16 G. Controlling the Side Blanking Mechanism 4-21 II. DISASSEMBLY/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. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 94
- Canon PC921 | Service Manual - Page 95
constant voltage control, on/off control DC voltage level control Density 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 (IMPRIME AU JAPON) 4-1 - Canon PC921 | Service Manual - Page 96
Drum cartridge Static eliminator Transfer roller Q101 Microprocessor DC controller PCB Lamp regulator block High-voltage circuit block Q900 Microprocessor Composite power supply PCB Figure 4-101 4-2 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME - Canon PC921 | Service Manual - Page 97
the Image Formation System Basic Sequence of Operations (Direct, 2 copies, continuous) Copy Start key ON STBY INTR SCFW SCRV SCFW SCRV LSTR Static eliminator bias 3200V Pre-registration roller paper sensor (Q751) Figure 4-102 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 - Canon PC921 | 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 PC921 | Service Manual - Page 99
High-voltage transformer for primary charging Primary charging roller Photosensitive drum Amplifier DC bias control signal PDC_PWM DC voltage monitor (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 PC921 | Service Manual - Page 100
primary charging bias ON signal (PR_DC_ON) from the DC controller PCB. When the Copy Start key is pressed, the DC bias ON signal (serial) and the primary 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 - Canon PC921 | Service Manual - Page 101
signal (PDC_PWM) to switch the level of the DC bias. (See Table 4-102.) Reference: The machine applies a DC bias over a non-copy image area (between sheets) so as to prevent charging the photosensitive drum to a positive potential otherwise caused by the cleaning bias from the transfer roller - Canon PC921 | Service Manual - Page 102
-voltage transformer control signal CLK32K +24V T302 Transfer 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. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON - Canon PC921 | Service Manual - Page 103
to ensure that the transfer bias remains a specific level at all times. Reference: 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) 4-9 - Canon PC921 | 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 PC921 | Service Manual - Page 105
DC bias are applied to the developing cylinder while copies are being made. When the photosensitive drum rotates and yet developing is not under way, toner on the photosensitive drum. Reference : Developing DC bias : -80 ~ -550V Developing AC bias : 1200Vpp ± 10% COPYRIGHT © 1999 CANON INC. CANON - Canon PC921 | Service Manual - Page 106
bias generation circuit + Photo sensitive drum Developing cylinder Static eliminator DC bias 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 - Canon PC921 | Service Manual - Page 107
DV_AC_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 composite power , about 3.2 kV). COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-13 - Canon PC921 | Service Manual - Page 108
foggy images or light images caused as by a change in the sensitivity of the photosensitive drum. The density correction switch (SW101) affects both manual density adjustment and auto density adjustment (AE). SW101 Figure 4-108 If the machine is not equipped with a density correction switch (SW101 - Canon PC921 | 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 PC921 | Service Manual - Page 110
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 24V + VR102 (Q101) Developing cylinder Photosensitive drum Microprocessor Microprocessor (Q900) Developing DCON signal - Canon PC921 | Service Manual - Page 111
approx.) Middle of original : Area read by AE sensor Figure 4-114 Copy Start key ON STBY INTR AER SCFW SCRV SCFW SCRV LSTR STBY Main motor (M1) Scanner / lens drive motor (M2) Scanning lamp (LA1) AE signal (AE) Figure 4-115 COPYRIGHT © 1999 CANON INC. CANON - Canon PC921 | 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 PC921 | Service Manual - Page 113
CHAPTER 4 IMAGE FORMATION SYSTEM 2) While keeping the condition in step 1), turn on the power switch. • the copyboard cover. 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 PRINTED IN JAPAN - Canon PC921 | Service Manual - Page 114
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 change is noted after re-adjustment, use the density correcting switch (SW101). Lighter Darker SW101 Figure 4-120 4-20 COPYRIGHT © 1999 CANON INC. CANON - Canon PC921 | Service Manual - Page 115
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. front) Figure 4-121 Reflecting plate A B B A , , Photosensitive drum Non-image area in Reduce mode A: Position of the side blanking lamp - Canon PC921 | Service Manual - Page 116
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 harnessband. 6. As a rule, do not operate the machine with any of its part removed. 7. A few of the screws used are - Canon PC921 | Service Manual - Page 117
, which 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 - Canon PC921 | Service Manual - Page 118
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: 1. If you need to rotate the drum, be sure to rotate it in the direction in which it rotates when making copies - Canon PC921 | Service Manual - Page 119
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 [3] [2] [1] Figure 4-202 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-25 - Canon PC921 | 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 PC921 | Service Manual - Page 121
CHAPTER 4 IMAGE FORMATION SYSTEM 7) Open the machine's top unit farther, and hold it in place using the handle of a screwdriver ( 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) 4-27 - Canon PC921 | Service Manual - Page 122
- Canon PC921 | Service Manual - Page 123
Paper 5-9 D. Detecting Jams 5-12 II. DISASSEMBLY/ASSEMBLY ..... 5-18 A. Pickup Assembly 5-19 B. Multifeeder Assembly ......... 5-28 C. Single-feeder Assembly ..... 5-31 D. Feeding Assembly 5-33 E. Registration Roller Assembly 5-34 F. Delivery Assembly 5-36 COPYRIGHT © 1999 CANON INC. CANON - Canon PC921 | Service Manual - Page 124
- Canon PC921 | Service Manual - Page 125
the leading edge of the image on the photosensitive drum; it is then moved through the transfer, separation, feeding, and fixing assemblies to reach the copy tray. The machine is equipped with four sensors used to monitor the movement of copy paper. Notation Name PS3 Delivery sensor Remarks PS4 - Canon PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 128
CHAPTER 5 PICK-UP/FEEDING SYSTEM DC controller PCB Spring Gear Cassette pickup solenoid drive SL1 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 PC921 | Service Manual - Page 129
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 PC921 | 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 PC921 | Service Manual - Page 131
leading edge of the image on the photosensitive drum. DC controller PCB Single-feeder paper detection signal (SFPD) M1 Pickup clutch Single-feeder paper sensor SL1 PS5 Copy paper Single-feeder Pickup roller Figure 5-107 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN - Canon PC921 | 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 PC921 | Service Manual - Page 133
of the main motor will reach the registration roller to move the copy paper to the photosensitive drum. Spring clutch Control ring Registration roller M1 Claw SL2 Paper detecting lever Copy paper Registration clutch solenoid drive signal (RGSLD*) DC controller PCB Pre-registration roller - Canon PC921 | 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 PC921 | Service Manual - Page 135
sensor (PS3) Scanner II I 0.3sec (approx.) Forward Reverse 0.7sec (approx.) I : Varied by value under '30' of service mode (registration adjustment). II : Used for measuring the length of copy paper. length of copy paper (mm) = 96 (mm/s) × II (s) + 11 (mm) -10 (mm) 96 (mm/s) : speed at which - Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 139
a specific period of time, the machine will identify the condition as a single feed pickup delay jam, stop the operation immediately, and flash the Jam indicator. Copy paper inserted STBY INTR SCFW Single-feeder paper sensor (PS5) Jam check Pre-registration roller paper sensor (Q751) Main motor - Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 145
CHAPTER 5 PICK-UP/FEEDING SYSTEM 7) Using a hex wrench or the like, push the off the power switch. 3) Mount the multifeeder; then, make a copy using the multifeeder. Pickup gear unit Figure 5-206 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 146
Open the machine's top unit, and hold it in place using the handle of a screwdriver (about 30 mm in diameter). 4) Disconnect the connector [1], and remove the screw [2]; then, detach the solenoid unit [3]. Figure 5-207 [1] [2] [3] Figure 5-208 5-22 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s - Canon PC921 | 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]. detach the pickup clutch [11]. [7] [8] Figure 5-210 [11] [10] [9] Figure 5-211 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 5-23 - Canon PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 150
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 two claws [2]; then, detach the feeding assembly cover [3]. Figure 5-216 [1] [2] [3] Figure 5-217 5-26 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s - Canon PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 153
CHAPTER 5 PICK-UP/FEEDING SYSTEM 2. Removing the Multifeeder Pickup Roller 1) Remove the multifeeder unit. (See 1. "Removing roller [6]. Figure 5-221 [4] Figure 5-222 [6] [5] Figure 5-223 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 5-29 - Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 157
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] [3] [5] [4] [3] [3] [4] [3] [4] [5] [3] Figure 5-231 COPYRIGHT © 1999 CANON INC. CANON - Canon PC921 | Service Manual - Page 158
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] [2] Figure 5-233 5-34 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 - Canon PC921 | 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 to 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 PC921 | Service Manual - Page 160
CHAPTER 5 PICK-UP/FEEDING SYSTEM F. Delivery Assembly 1. Removing the Delivery Roller 1) Remove the fixing , detach the sensor holder [6]. [3] [3] [2] [1] Figure 5-237 [5] [6] [4] Figure 5-238 5-36 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | 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 PC921 | Service Manual - Page 162
- Canon PC921 | Service Manual - Page 163
SYSTEM This chapter explains the principles used to fuse toner images to transfer medium in view of the functions Fixing 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 PC921 | Service Manual - Page 164
- Canon PC921 | Service Manual - Page 165
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 PRINTED IN JAPAN (IMPRIME AU JAPON) 6-1 - Canon PC921 | Service Manual - Page 166
fuse 2 (FU2) Fixing thermistor signal (TH1) 6-2 Fixing heater (H1) 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 PC921 | Service Manual - Page 167
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 PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 6-3 - Canon PC921 | 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 PC921 | Service Manual - Page 169
190 Controlling the Temperature of 185 the Fixing Heater 180 ( C) 120 100 1 10 30 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 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 6-5 - Canon PC921 | Service Manual - Page 170
The 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. 1999 - Canon PC921 | 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 PC921 | Service Manual - Page 172
error is detected in relation to the heater during copying operation, the machine will indicate 'E000' through 'E003' in the copying operation. E003 The temperature detected by the thermistor (TH1) is 160°C and then 150°C or lower during copying operation. 6-8 COPYRIGHT © 1999 CANON INC. CANON - Canon PC921 | Service Manual - Page 173
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 (IMPRIME AU JAPON) 6-9 - Canon PC921 | Service Manual - Page 174
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 PC921 | Service Manual - Page 175
not touch it or subject it to dust. 2. The machine does not have a mechanism used to adjust the roller [1] Fixing heater [2] Fixing film [3] Inlet guide [4] Fixing lower roller [5] Cleaning roller Figure 6- Figure 6-202 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN - Canon PC921 | Service Manual - Page 176
[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 INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 177
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/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 6-13 - Canon PC921 | Service Manual - Page 178
the fixing lower roller. (See 3. "Removing the Fixing Lower Roller.") 2) Remove 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 PC921 | Service Manual - Page 179
MECHANISMS This chapter shows the machine's external parts, and explains the principles used for the machine's various control mechanisms in view Main Drive Assembly 7-17 E. Electrical System 7-21 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON - Canon PC921 | Service Manual - Page 180
- Canon PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 183
cooling fan +24VU Blanking 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 PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON - Canon PC921 | Service Manual - Page 184
machine machine's DC controller PCB. The machine's power switch is a soft switch, and the machine ', and 'E003', the machine is equipped with a DC capacitor as part of the DC controller circuit For +24 VR, two types of voltage are used: • During copying, +24 V ±5% • During standby, +18 V ±10% However - Canon PC921 | 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 PC921 | Service Manual - Page 186
Detecting an Error on the Composite Power Supply PCB The machine's composite power supply PCB is equipped with a self stopped, it may be reset by opening the machine's top unit, correcting the load, and then turning the power switch back on. Keep in mind, however, that repeated short-circuiting and - Canon PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 189
the covers as necessary when cleaning, inspecting, or repairing the inside of the machine. Those covers that may be detached from their own 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 PC921 | Service Manual - Page 190
the 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 front upper Figure 7-304 [3] [4] [3] Figure 7-305 7-10 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 191
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 IN JAPAN (IMPRIME AU JAPON) 7-11 - Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 195
the Control Panel 1) Open the machine's top unit. 2) Remove the and remove the power supply switch assembly [4]. Move the copy density adjusting lever [5] to the farthest right, and Exposure Manual Exposure Photo Timer Saver [3] [7] [5] Figure 7-315 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s - Canon PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 198
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 PC921 | 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 PC921 | Service Manual - Page 200
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 PC921 | Service Manual - Page 201
E. Electrical System 1. Removing the DC Controller PCB 1) Open the machine's top unit. 2) Remove the screw [1], and detach the [1] [1] Figure 7-326 [3] [4] [5] [4] [4] Figure 7-327 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 7-21 - Canon PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 204
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 heat radiating plate (at the center) or its both edges. In particular, keep in mind that holding the area indicated by " " can cause deformation or cracking of - Canon PC921 | 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 PC921 | Service Manual - Page 206
- Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 220
to pickup faults. Any pickup fault causes the ADF controller to flash the JAM indicator on the copier and stop the pickup motor at the same time. ADF controller PCB +24V Q1 CPU PM1 PM0 Q5 Motor driver PMRD1 PMRD1* Pickup motor M2 Figure 8-121 Motor drive signal (PM0) '1' '1' '0' '0' Motor - Canon PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 223
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 ADF is opened, i.e., when the ADF switch (MS1) turns off. The 5V supply will continue to keep each sensor powered even when the ADF is opened. ADF switch - Canon PC921 | 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 PC921 | Service Manual - Page 225
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/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU - Canon PC921 | 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 PC921 | Service Manual - Page 227
checking, 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 - Canon PC921 | 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 PC921 | Service Manual - Page 229
screw [1] and the bushing [2]; then, remove the pickup roller cover [3]. CHAPTER 8 ADF [1] 3) Remove 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 PC921 | 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 PC921 | 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 PC921 | 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) 3) 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 240
- Canon PC921 | 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 PC921 | Service Manual - Page 242
- Canon PC921 | Service Manual - Page 243
9 INSTALLATION I. SELECTING A SITE Keep the following in mind when selecting a site for installation; if possible, visit the user's before delivery of the machine: • The site offers a power outlet whose rating is as specified (±10%) and which may be used exclusively for the machine. • The site is - Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 250
grooves in the copy tray are all in place. 21 Place copy paper inside the cassette. (For how, see B. "Placing Copy Paper.") 22 All notations copies as specified are made correctly. 24 Clean the externals of the machine and the area around the machine. 9-8 COPYRIGHT © 1999 CANON INC. CANON - Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 254
indicator will indicate ' '. feed tray; then, press the Copy Start key without placing any paper on the manual feed tray. Turn off the power switch, and disconnect the power plug from the outlet. Pull the open/close lever found on the left of the machine, and open the machine's top unit. Take out - Canon PC921 | Service Manual - Page 255
attachment [1] Shipping attachment [2] 9 Tape the machine's top unit in place to prevent it from opening. 10 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 - Canon PC921 | Service Manual - Page 256
- Canon PC921 | Service Manual - Page 257
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 Packaging Seal Removed 10-3 COPYRIGHT © 1999 CANON - Canon PC921 | Service Manual - Page 258
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. 1999 PRINTED IN JAPAN - Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 262
possible if such a problem is noted; the memory (i.e., cause of white spots 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 - Canon PC921 | Service Manual - Page 263
- Canon PC921 | Service Manual - Page 264
Faults ....... 11-52 C. Troubleshooting Image Faults 11-53 IV. TROUBLESHOOTING 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 - Canon PC921 | Service Manual - Page 265
- Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 269
Cartridge Item Drum cover shutter Tools/solvents Most cloth Work/remarks Cleaning; be sure to remove all toner to prevent toner soiling images. Pickup, Feeding Moist cloth Transfer guide Moist cloth Transfer charging Lint-free paper roller Static eliminator Feed belt Special brush Moist - Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 275
11 TROUBLESHOOTING d. Checking the Force of the Cassette Spring If the force of the spring used to hold up the holding plate of the cassette is not correct, pickup faults or the like can occur. If a fault is suspected, check the force of the spring using a spring gauge (CK-0054), and replace - Canon PC921 | 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 PC921 | 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 PC921 | 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 [5], and detach the left upper stay [4]. [5] [5] [4] Figure 11-216 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 11-13 - Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 285
CHAPTER 11 TROUBLESHOOTING 3. Routing the Forwarding Cable 1) Fit the longer end forwarding cable (black) [2] on the top hook of the cable drive pulley [1], and [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 PC921 | Service Manual - Page 286
CHAPTER 11 TROUBLESHOOTING 3) Lead the longer end [5] under the No. 1 mirror mount [7]; then, hook it on the 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) 11-21 - Canon PC921 | Service Manual - Page 287
CHAPTER 11 TROUBLESHOOTING 5) Free the shorter end [3], and hook it on the pulley [11] on the right rear side. 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 PC921 | 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] [ both with a spring [14]; then, fit the stopper [15]. [3] [14] [15] [5] Figure 11-234 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 11-23 - Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 293
CHAPTER 11 TROUBLESHOOTING f. Point to Note When Mounting the Scanning Lamp When mounting ) Scanning lamp (mirror mount moving in reverse) 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. • - Canon PC921 | 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 PC921 | Service Manual - Page 295
11 TROUBLESHOOTING B. ADF 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 - Canon PC921 | 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 PC921 | Service Manual - Page 297
10mm CHAPTER 11 TROUBLESHOOTING 3. Adjusting the Rear/Front Original Stop Position You must first correct original skew before adjusting the rear/front original stop position. 1) Obtain a sheet of A4 or LTR white copy paper, and draw two lines as indicated. • The sheet will be used as a test sheet. - Canon PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 300
10mm CHAPTER 11 TROUBLESHOOTING 4. Adjusting the Original Leading Edge Stop Position You must first correct original skew and adjust the rear/front original stop position before adjusting the original leading edge stop position. 1) Obtain a sheet of A4 or LTR white copy paper, and draw two lines as - Canon PC921 | 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 PC921 | Service Manual - Page 302
TROUBLESHOOTING 6) If the distance is not as specified, shift bit 1 of the DIP switch (SW1) on the ADF controller PCB to ON, and place an A4 or LTR white copy paper 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 - Canon PC921 | 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 PC921 | Service Manual - Page 304
CHAPTER 11 TROUBLESHOOTING Example: If L4 is 13 mm, You must shift the original stop position toward the leading edge by 3 mm. 1) Place a sheet of A4 or LTR white copy paper on the original tray. 2) Shift bit 1 of the DIP switch (SW1) on the ADF controller PCB to ON; then, push the push switch - Canon PC921 | Service Manual - Page 305
CHAPTER 11 TROUBLESHOOTING 4) Press 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. - Canon PC921 | Service Manual - Page 306
CHAPTER 11 TROUBLESHOOTING C. Electrical 1. After Replacing the Major Parts Parts Scanning lamp AE copy images using the Test Sheet; if (and only if) an image fault is found, adjust the intensity of the scanning lamp and execute AE adjustment. Table 11-206 COPYRIGHT © 1999 CANON INC. CANON - Canon PC921 | Service Manual - Page 307
11 TROUBLESHOOTING 2. Adjusting the Intensity of the Scanning Lamp Adjust the intensity of the scanning lamp if you have replaced any cartridge in the machine. 2) Set the density correction switch (SW101) to its middle index. SW101 Figure 11-263 3) Turn off the AE mechanism, and set the copy - Canon PC921 | 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 PC921 | Service Manual - Page 309
CHAPTER 11 TROUBLESHOOTING 4) Turn VR103 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 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 310
11 TROUBLESHOOTING 9) Repeat steps 5) through 8) so that the values of both VR102 and VR103 are target values. Caution: If you cannot set VR102 and VR103 to the target values at the same time, turn VR103 fully counterclockwise, and go back to step 5) and make adjustments once again. 10) Make a copy - Canon PC921 | 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 PC921 | Service Manual - Page 312
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 roller paper sensor (PDP) Q751 Pre-registration roller paper sensor - Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 319
, lens, 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 - Canon PC921 | 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 PC921 | Service Manual - Page 321
Go to step 3. 1. Clean the transfer guide. 2. Clean the registration roller. 3. Check the varistor. 4. Check the cartridge for leakage of toner. Clean the feeding assembly. Clean the pickup guide assembly and the delivery roller. 11-56 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 - Canon PC921 | Service Manual - Page 322
CHAPTER 11 TROUBLESHOOTING 14 The copy has a fixing fault. Cause Copy paper Fixing film Fixing heater DC controller PCB, Composite power supply PCB Step 1 2 3 Checks Is the copy paper of a recommended type? Is the problem vertical and, in addition, in the form of lines? Does the heater turn on - Canon PC921 | Service Manual - Page 323
CHAPTER 11 TROUBLESHOOTING 18 The copy has a blurred image. Cause Scanner drive cable Scanner rail Feeding system Cartridge Step 1 2 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 328
TROUBLESHOOTING 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 driver PCB to the composite power supply PCB; if normal, see "DC power fails to turn on." End. Replace the DC controller PCB. COPYRIGHT © 1999 CANON INC. CANON - Canon PC921 | 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 PC921 | Service Manual - Page 330
Turn off and then on the power switch. Is the problem corrected? YES/NO YES NO Action End. However, if 'E261' occurs frequently, advise the user to use a frequency stabilizer. Replace the composite power supply PCB. COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN - Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 334
, and connect the meter probes to the following terminals. Does the 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 - Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 340
11 TROUBLESHOOTING V. TROUBLESHOOTING FEEDING PROBLEMS 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 - Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 344
CHAPTER 11 TROUBLESHOOTING VI. ARRANGEMENT AND FUNCTIONS OF ELECTRICAL PARTS A. Sensors and Solenoids SL3 PS2 SL4 SL2 SL1 PS5 SL5 PS4 PS1 Q751 PS3 Symbol PS SL Figure 11-601 Name Photointerrupters Notation PS1 PS2 - Canon PC921 | 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 PC921 | Service Manual - Page 346
C. Lamp, Heater, Motor, Etc. CHAPTER 11 TROUBLESHOOTING M1 M2 LA1 TH2 FU1 VZ2 FU2 H1 TH1 VZ1 FM1 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 - Canon PC921 | Service Manual - Page 347
CHAPTER 11 TROUBLESHOOTING D. PCBs [9] [3] [4] [1] [7] [8] [5] [2] [6] Figure 11-604 Ref. Name [1] Noise filter PCB [2] lamp. Makes an electrical connection between the machine top and bottom. Provides copying insurrections/indications. Detects paper in front of the registration roller. - Canon PC921 | Service Manual - Page 348
E. ADF CHAPTER 11 TROUBLESHOOTING MS1 M2 M1 [1] PI1 PI3 PI2 Symbol PS M [1] Figure 11-605 Name Photointerrupter Notation PI1 PI2 PI3 Description Delivery paper detection Registration roller paper detection Original placement detection Microswitch MS1 ADF open/close switch Motor M1 - Canon PC921 | 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 PC921 | 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 PC921 | 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 sec after the Copy Start key has been pressed. sec after the Copy Start key has exeeded 150°C during copy operation and maximum - Canon PC921 | Service Manual - Page 352
CHAPTER 11 TROUBLESHOOTING Code Cause • The main motor (M1) is fault. • The DC controller 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 PC921 | 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 PC921 | Service Manual - Page 354
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 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 355
- Canon PC921 | Service Manual - Page 356
Sequence Power switch ON STBY Copy Start key ON INTR AER Vertical path roller paper sensor (PS4) 9 Registration clutch solenoid (SL2) 10 Pre-registration roller paper sensor (Q751) / lens drive motor (reverse) COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN - Canon PC921 | Service Manual - Page 357
copies, DIRECT, from cassette) SCRV LSTR STBY A-2 1 Pickup motor (M2) 2 Belt motor (M1) ADF 3 4 Original detection sensor (PI3) Registration paper paper sensor (PS4) 9 Registration clutch solenoid (SL2) 10 Copier Pre-registration roller paper CANON INC. CANON PC800s/900s REV.0 AUG. 1999 - Canon PC921 | Service Manual - Page 358
and abbreviations used in the chapters of the manual and circuit diagrams. The abbreviations within parentheses signal SCANNER HOME POSITION signal SINGLE-FEEDER PAPER DETECTION signal TRANSFER BIAS VOLTAGE DETECTION signal STBY STANDBY COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. - Canon PC921 | Service Manual - Page 359
A-4 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 360
Thermal fuse 2 J434 11 22 C. GENERAL CIRCUIT DIAGRAM MAIN MOTOR DRIVER PCB 1. Copier J901 1 2 3 4 Main motor M1 M BP701 BP705 PR 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 - Canon PC921 | Service Manual - Page 361
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 INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 21 21 - Canon PC921 | Service Manual - Page 362
3 2 OUT VCC GND +5V C105 +5V R269 COMP_CLR Q157 M1_ON* SB_ON DV_AC_ON* DV_DC_ON* PR_DC_ON* CPS_REQ* SEG 8 01234567 01234567 C193 8 KEY ADF type only COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) A-7 - Canon PC921 | Service Manual - Page 363
GB 16 INB* 17 INB 18 OUTB R112 C106 R107 R108 +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 PC921 | Service Manual - Page 364
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 JAPAN (IMPRIME AU JAPON) A-9 - Canon PC921 | Service Manual - Page 365
R242 R241 R358 2 3 2 7 3 5 KR6 [CPM0] 12 D102 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 D190 KR3 [VOL1] D214 DIG3 DIG0 AB/inch inch - Canon PC921 | Service Manual - Page 366
1 4 Q107 R271 ZER_CRS_LEVEL R154 C126 Q153 1 IN B VDD 5 2 IN A 3 VSS OUT X 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 (AB/inch type only) 2 1 +5V R144 D_L_2 D_L_1 R143 +5V - Canon PC921 | Service Manual - Page 367
C140 SC_HP_CPU RETRY_PD_CPU C250 C129 R169 R356 +5V R250 R246 R245 R244 ACK* MLOCK HEAT_ERR* 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 PC921 | Service Manual - Page 368
R186 R187 3+ 8 2- 4 Q108 C176 1 +5V Q151 R214 C161 C160 R212 +5V 5+ 8 7 6- 4 Q108 +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 PC921 | Service Manual - Page 369
2 J130 TH2 1 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 3 J114 4 J114 5 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 370
WD LED ADFC PDP3 PDP2 PDP1 R44 NC NC A15 15 RD* +5V C8 C22 +5V HC14 14 VCC GND 7 Q6 +5V C10 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) A-15 - Canon PC921 | Service Manual - Page 371
TP1 DM0 6 7 4 6 TP1 VCC NC DM1 7 1 IN1 2 IN2 3 OUT1 5 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 PC921 | Service Manual - Page 372
TXD 3 J2 2 J2 RXD 1 J2 R37 R38 2 3 1 4 +5V SW1 R39 SW3 HC14 6 5 Q6 HC14 8 9 Q6 HC14 10 11 Q6 HC14 12 13 Q6 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) A-17 - Canon PC921 | Service Manual - Page 373
A-18 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) - Canon PC921 | Service Manual - Page 374
+5V HEAT_TRG R609 Q620 R611 C620 Q621 R614 R615 Q611 R603 R602 C605 2 Q608 31 C604 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 PC921 | Service Manual - Page 375
7 13 12 5 11 1 10 2 9 24VOFF 24VON LOW_GU 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 PC921 | Service Manual - Page 376
D117 R129 4 D118 7 8 Q117 O.V.P Q108 R127 +5V + C135 O.C.P.1 +24VU +5V R151 R153 + C103 C129 Q116 5 8 7 6 4 C160 D131 C127 R125 R186 R185 O.C.P.2 CLIMIT COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) A-21 - Canon PC921 | Service Manual - Page 377
PAC_OUT JP140 +24VR 25 1 3 Q526 + C561 4 R516 R514 C509 C539 T508 3 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 PC921 | Service Manual - Page 378
C221 + +5V R207 ACBIAS Q206 BIAS_PWM JP201 C219 C208 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 PC921 | Service Manual - Page 379
R356 C345 D326 +5V D323 D325 C343 C344 Q321 R388 C321 T_REV_ON* C380 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 PC921 | Service Manual - Page 380
2 MMD 1 MLOCK J203 1 2 3 4 5 6 7 8 RLOFF* ACK* MMD CPS_REQ PR_DC_ON DV_DC_ON DV_AC_ON STBY/CPY* 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 PC921 | Service Manual - Page 381
R063 +5V R002 4 6 Q002 C004 1 2 3 D002 D010 D009 D011 D008 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 PC921 | Service Manual - Page 382
COPY SW303 ZOOM SW307 AE C303 SW304 PRESET COPY DIG0 J301 2 DIG1 J301 3 DIG2 J301 4 DIG3 J301 19 DIG4 LED307 21 JAM LED308 21 AE 1 2 3 4 5 6 7 8 LED315 LED301 21 J301 12 SEG7 R308 ADF type only COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME - Canon PC921 | Service Manual - Page 383
- Canon PC921 | 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 PC921 | 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 PC921 | 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 PC921 | Service Manual - Page 387
JP711 1 2 1 2 JP712 JP713 1 2 1 2 JP714 R704 R701 PR BP701 SP BP702 DV BP703 TR BP704 2 R702 1 [PR_IN] BP705 [GND_IN] 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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 PC921 | 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-