Canon PC770 Service Manual

Canon PC770 Manual

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  • Canon PC770 | Service Manual - Page 1
    PET2C11T4CO MOTO SERVICE MANUAL REVISION 0 AUG. 1994 COPYRIGHT © 104 CANON INC, Canon FY8-13DA-000 CANON PC774740750770 REV.° AMIE% PRINTED 1N JAPANRAPAIIAE AU JAPON)
  • Canon PC770 | Service Manual - Page 2
  • Canon PC770 | Service Manual - Page 3
    of replacement parts and consumables. In addition to the above chapters, this Service Manual contains a set of appendixes consisting of a general timing chart and general circuit diagrams. A separate document entitled Service Handbook is also available for troubleshooting problems in the copier
  • Canon PC770 | Service Manual - Page 4
  • Canon PC770 | Service Manual - Page 5
    II. SPECIFICATIONS 1-1 III. NAMES OF PARTS 1-6 1-2 IV. OPERATIONS 1-8 CHAPTER 2 COPYING PROCESS I. IMAGE FORMATION 2-1 II. AUXILIARY . UNPACKING AND INSTALLATION 5-1 III. RELOCATING THE COPIER 5-7 5-2 COPYRIGHT © 1994 CANON INC. CANON PC7201740,11501170 REV.O AUG. 1994 PRINTED IN JAPAN
  • Canon PC770 | Service Manual - Page 6
    SERVICING I. PERIODICALLY REPLACED PARTS 6-1 II. DURABLES AND CONSUMABLES 6-1 III. SCHEDULED SERVICING 6-1 IV. POINTS TO NOTE WHEN HANDLING/STORING THE CARTRIDGE 29 N. SOLVENTS/OILS A-30 D COPYRIGHT © 1994 CANON INC. CANON PC720R401750R70 REVD AUG.1994 PRINTEDINJAPAN 0NPRIME AU JAPON)
  • Canon PC770 | Service Manual - Page 7
    CHAPTER 1 GENERAL DESCRIPTION I. FEATURES II. SPECIFICATIONS 1-1 III. NAMES OF PARTS 1-6 1-2 IV. OPERATIONS 1-8 COPYRIGHT 0 MI CANONIC CANON PC72740750770 MO AUO.INS KORENJAPAIIompriCwavog
  • Canon PC770 | Service Manual - Page 8
  • Canon PC770 | Service Manual - Page 9
    the copies. • The black toner cartridge may be replaced with a color toner cartridge (red, blue, green, brown); using overlay mode, copies may be given an extra finish. 7. Separate top unit. • The copier's top unit may be opened to make jam removal easy. COPYRIGHT @ 1994 CANON INC. CANON PC7201740
  • Canon PC770 | Service Manual - Page 10
    dia.) PC750 2. System Item PC720 PC740 PC750 Copying Indirect static reproduction Charging Roller (direct charging) Exposure Slit (moving light source) Copy density adjustment Automatic (AE) or manual Development Dry Auto Pick-up Manual Cassette (1 holder) Singlefeeder Multifeeder
  • Canon PC770 | Service Manual - Page 11
    copying 100 copies (max.) Copying speed See Tale 1-1. Copy size A4R/LGL (max.), business card (min.) Cassette Plain paper (64 to 80 g/m2), tracing paper (SM-1), colored paper Copy paper type Single manual feeding Plain paper Canon. COPYRIGHT © 1994 CANON INC. CANON PC7201740/750M0 REV.O AUG.1994
  • Canon PC770 | Service Manual - Page 12
    ratio Size Copy paper DIRECT REDUCE ENLARGE A4R A4R B5R B5R A5R A5R A4R -, A5R A5R II B5R -, A5R A5R I A5R A4R A4R II B5R .- A4R A4R PC770 12 12 12 12 12 9 10 Table 1-101 Model PC740/750 10 10 10 10 10 7 8 PC720 8 8 8 8 8 6 7 1- 4 COPYRIGHT © 1994 CANON INC. CANON PC7201740
  • Canon PC770 | Service Manual - Page 13
    GENERAL DESCRIPTION= Power supply 100V 115V 220/240V Serial number Serial number Serial number NDB xxxxx Serial number LCD xxxxx NDC xxxxx PBC xxxxx COPYRIGHT © 1994 CANON INC. CANON PC72017401750870 REV.O AUG. 1994 PRINTED IN JAPAN (1MPRIME AU JAPAN) 1 -5
  • Canon PC770 | Service Manual - Page 14
    glass 0 Copyboard cover Figure 1-301 © Static eliminator 02 Copy density correction switch © Delivery guide plate ® Copy tray Figure 1-302 0 Power cord connector ® Open/close lever 1- 6 COPYRIGHT 1994 CANON INC. CANON PC12O174017501770 FIEY.0 AUG.1994 PRINTEDIN JAPAN pmpRimt AU JAPON)
  • Canon PC770 | Service Manual - Page 15
    exposure lamp No. 6 mirror Reflecting plate Cartridge No. 4 mirror No. 5 mirror Pick Transfer roller Static eliminator Photosensitive drum Figure 1-303 Feeding assembly Cassette Copy tray Single feeder roller (PC72O/74O) 4©©C>CXDCXDC)CD08 06(58 CD©ggg© 60896§66® COPYRIGHT © 1994 CANON INC. CANON
  • Canon PC770 | Service Manual - Page 16
    Adjust lever 2 AE indicator 3 Ratio indicator 4 ZOOM indicator 5 Paper Select/ Add Paper indicator 6 Jam indicator 7 Copy Count/ Ratio indicator 8 Power switch 9 Copy Start key 10 Clear/Stop key Description Use it to manually adjust the copy density. Remarks Turns on when AE is selected
  • Canon PC770 | Service Manual - Page 17
    Select key 13 Zoom Mode key 14 Default Ratio key 15 AE key Description Sets a copy count or a reproduction ratio. Remarks Selects the cassette as the source of paper or Selects the multifeeder. Selects or deselects zoom mode. Selects a default reproduction ratio. May be between 70% and 141
  • Canon PC770 | Service Manual - Page 18
    is finished, the Copy Count indicator indicates the initial copy count. If copying stopped as a result of the absence of paper, a press on the Copy Start key after supplying paper will automatically make the remaining number of copies. 1 - 10 COPYRIGHT © 1994 CANON INC. CANON PC7207401750r/70 REV
  • Canon PC770 | Service Manual - Page 19
    initial count.) f. If paper jams, the JAM indicator will flash and copying operation stops; open the top unit. (The power turns off when the top unit is opened for removal of the jam.) g. After copying operation is over, the auto power-off mechanism becomes activated if the copier is left alone for
  • Canon PC770 | Service Manual - Page 20
    the trailing edge of the copy paper; hang on to the copy paper, and remove it when the transparency has disappeared into the machine. Figure 1-405 Figure 1-406 2) Place an original on the copyboard, and close the copyboard cover. 3) If you want to manually adjust the copy density, deselect AE, and
  • Canon PC770 | Service Manual - Page 21
    edge of the copy paper. 3) Press the Copy Start key while still holding the trailing edge of the copy paper; hang on to the copy paper, and remove it when the transparency has disappeared into the machine. GENERAL DESCRIPTIONINN Figure 1-408 COPYRIGHT © 1994 CANON INC. CANON PC120/7401750/770
  • Canon PC770 | Service Manual - Page 22
    once. O In the case of an overlay copy, only one side may be used. 0 After the first copy run, cool the paper sufficiently and remove the curl before feeding it for the second copy run. I/ Figure 1-409 1 - 14 COPYRIGHT 0 1994 CANON INC. CANON PC720I7441759ITIO REV.O AUG.1444 PRINTED IN JAPAN
  • Canon PC770 | Service Manual - Page 23
    in the cassette holder. 3) Press the Copy Start key. CI The 'P' indication should go off, and the copier will make the remaining number of copies. Figure 1-410 4) Pull out any jam from inside the machine with care. 0 Figure 1-411 COPYRIGHT 1994 CANON INC. CANON PC720/T401759/770 REV.O AUG.1994
  • Canon PC770 | Service Manual - Page 24
    cartridge in the copier, and make a copy. a. If the copy image has returned to normal, • Advise the user that, although he/she may continue to use the cartridge, a new cartridge should be obtained. b. If the copy image fails to return to normal, • Replace the cartridge according to the instructions
  • Canon PC770 | Service Manual - Page 25
    4) Peel the end of the Open seal of the cartridge, and pull it straight out toward the front (about 50 cm). Figure 1-418 6) Press down on the mark on the copier's top to close the body. Figure 1-417 Figure 1-419 COPYRIGHT © 1994 CANON INC. CANON PCT20/7401150M0 RE© AUG.1994 PRINTEDIN JAPAN twat
  • Canon PC770 | Service Manual - Page 26
    2) Change the position of the density cor- rection switch. O G. Cleaning If the images tend to be soiled or copy paper tends to jam frequently, advise the user to clean the following parts: 1. If Images Are Soiled a. Copyboard Glass/Copyboard Cover Wipe it with a moist cloth; then, dry wipe it. If
  • Canon PC770 | Service Manual - Page 27
    sure to wring it well. 2. Frequent Jams a. Static Eliminator 1) Open the copyboard cover, and remove the static eliminator cleaner. Caution: Do not make copies until the multi pickup roller has dried completely. Separation pad Multi pick-up roller Copy paper Figure 1-422 Figure 1-423 2) Shift up
  • Canon PC770 | Service Manual - Page 28
    ~'
  • Canon PC770 | Service Manual - Page 29
    CHAPTER 2 COPYING PROCESS I. IMAGE FORMATION 2-1 II. AUXILIARY PROCESS 2-8 COPYTIGHT © 1994 CANONIC. CANON PC720710750770 REYA AUG.1944 PRIMEDIN JAPANomit AU JAPON)
  • Canon PC770 | Service Manual - Page 30
  • Canon PC770 | Service Manual - Page 31
    COPYING PROCESS MI I. IMAGE FORMATION A. Outline The copier uses a direct Drum cleaning (3. Development) Delivery 6. Fixing 4. Transfer 5. Separation Registration : Flow of copy paper (Cassette/manual feed) : Rotation of photosensitive drum Figure 2-102 COPYRIGHT © t994 CANON INC. CANON
  • Canon PC770 | Service Manual - Page 32
    INN COPYING PROCESS The copier's image At the end of this block, the areas on the photosensitive drum corresponding to the black areas of the original are left with (step 2) Figure 2-104 2 - 2 COPYRIGHT 1994 CANON INC. CANON PC7201140750= REV.O AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC770 | Service Manual - Page 33
    static latent images. The copier uses its primary charging roller to directly charge the photosensitive drum (primary charging). The primary original is projected to the photosensitive drum to neutralize the charges in the light area. COPYRIGHT © 1994 CANON INC. CANON PC720/740/150M0 REV.O AUG.1994
  • Canon PC770 | Service Manual - Page 34
    MN COPYING PROCESS E. Development (step 3) Blade Developing cylinder Toner 0 Cylinder} copier's toner is a one-component toner (for both black and color) made mostly of magnetite and resins. The toner 4 COPYRIGHT © 1994 CANON INC. CANON PC72N7401150R/0 REV.O AUG.1994 PRINTED IN JAPAN (IMPRIME
  • Canon PC770 | Service Manual - Page 35
    Toner may collect on the transfer roller if the image on the photosensitive drum fails to transfer to the copy paper because of a jam or the like. The copier since copy paper is retained by both the transfer charging roller and the photosensitive drum. COPYRIGHT 1994 CANON INC. CANON PC7201740/750
  • Canon PC770 | Service Manual - Page 36
    6) Copy paper O Fixing heater Thermistor Fixing film Toner Static eliminator Figure 2-112 Copy paper is separated from the photosensitive drum using the rigidity of the paper. Thin paper, however, has low rigidity and can wrap around the photosensitive drum. To prevent such a problem, the copier
  • Canon PC770 | Service Manual - Page 37
    run, the cleaning blade scrapes off the residual toner from the photosensitive drum by way of cleaning the photosensitive drum surface. The scoop-up sheet then is used to collect such toner. COPYING PROCESS= COPYRIGHT 1994 CANON INC CANON PC72017401750770 REV.0 AUG. 19W PRINTED IN JAPAN MAPROJE
  • Canon PC770 | Service Manual - Page 38
    IIIIIII COPYING PROCESS II. AUXILIARY PROCESS 1. Side Blank Exposure Side blank exposure is used to prevent adhesion of excess toner to the drum by removing the residual potential in the nonimage areas of the drum. See p. 3-35 for details. 2 - 8 COPYRIGHT © 1994 CANON INC. CANON PC720/74017501770
  • Canon PC770 | Service Manual - Page 39
    III. IMAGE FORMATION SYSTEM 3-17 IV. PICK-UP/FEEDING SYSTEM 3-36 V. FAN 3-59 VI. POWER SUPPLY VII. STANDARDS AND ADJUSTMENTS VIII. SELF DIAGNOSIS COPYRIOW 1901 CANONIC CANON PC1101/407I07/0 ROA AUG 4 WAITEDIN JAPAN IMPRIME AU JAPAN) 3-60 3-64 3-71
  • Canon PC770 | Service Manual - Page 40
    ;::',>. 1 .4 S> .i . > •• < s'J 4 Y 4• ' Fri: t '..'. k ..:Q .'.. '>4•• I•e../ 0.5s .k .., (. ? > . .• V .V . .4 '' 'ed .4. ..... ?:. '. ,... i ./... < '''',. ...' 4‹ {.. 2 :. . . .. .,V, .. . • S. >e .0 ....' f r ?, :. ; :k{/ ... 's'4jP '?
  • Canon PC770 | Service Manual - Page 41
    I. BASIC OPERATION A. Functional Construction The copier can roughly be divided into four functional charging roller Image formation block Drum cleaning assembly Photo sensitive drtlfp,j feeding block Figure 3-101 COPYRIGHT © 1994 CANON INC. CANON PC720.7401150,710REV.O AUG.1994 PRINTED IN JAPAN
  • Canon PC770 | Service Manual - Page 42
    copier's major electrical control mechanisms are driven by the microprocessor on the DC controller PCB. The microprocessor reads input signals from the sensors and the operation keys in response to the instructions paper detection • Delivery paper detection • Film displacement detection • Cartridge
  • Canon PC770 | Service Manual - Page 43
    sensor - L_I- PS 3 Fixing film - LT displacement sensor PS 4 Single feeder paper - LT sensor (PC720/740) PS 7 Cartridge color sensor - LJ- Q753 Pre-registration roller paper sensor Q751 Cassette paper sensor Main thermistor (thermal control) Sub thermistor (overheating) - LJ- Q752 TH 1 TH
  • Canon PC770 | Service Manual - Page 44
    DIG1 HEAT2 Combinations of 3-bit signals are used to correct the variations in the resistance of the fixing heater in 7 settings. 3 - 4 Figure 3-104 COPYRIGHT © 1994 CANON INC. CANON PC7207401756770 REV.O AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC770 | Service Manual - Page 45
    O Transfer charging roller O Static eliminator O Highvoltage circuit 00 Noise filter 00 PCB Door switch +5V +24V tt DC power supply circuit Figure 3-105 COPYRIGHT © 1994 CANON INC. CANON PC72017401750M0 REV.O AUG.1994 PRINTED IN JAPAN ommait AU JAPON) 3- 5
  • Canon PC770 | Service Manual - Page 46
    '1'. SC_A* (See p. 3-16 for details.) SC A J106-1 SB_LP* when '0', blank exposure lamp on. Side blank exposure lamp (front) '+24V *Negative logic. 3 - 6 Figure 3-106 COPYRIGHT © 1994 CANON INC. CANON PC720/74017501170 REVD AUG.1994 PAINTEDIN JAPAN EMPRIMEAU JAPON)
  • Canon PC770 | Service Manual - Page 47
    sec while the main motor drive signal (MMD) is '1', the DC controller identifies an error in the main motor, stops the main motor and, at the same time, indicates ` Main motor control PCBJ COPYRIGHT © 1994 CANON INC. CANON PC7201740R501770 REV.0 AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPON) 3 -
  • Canon PC770 | Service Manual - Page 48
    On 3.2 Sec (approx.) After Power-On Power switch ON V STBY Copy Start key ON INTR SCFW SCRV Main motor (M1) Scanning lamp ( Figure 3-108 SCFW SOW LSTR STBY 2.0 sec (approx. / .101=IIN 3- 8 COPYRIGHT © 1994 CANON INC. CANON PC720R4011500 REY.0 AUG.1994 PRINTED IN JAPAN (ImpRimt AU JAPON)
  • Canon PC770 | Service Manual - Page 49
    Developing DC bias Transfer bias Static eliminator bias Heater (H1) rPower switch ON I I-Copy Start key ON '7 V INTR SCFW 3.5 sec (approx.) SCRV Pre-heat I II (approx.) • P"iii IME COPYRIGHT © 1994 CANON INC. CANON PC72011401750I170 REV.O AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPON) 3- 9
  • Canon PC770 | Service Manual - Page 50
    , and the reflected is generated, and the • The distance traveled optical image is projected on copy paper is moved forward varies depending the photosensitive drum by to the transfer on the copy paper size and way of mirrors and lenses. assembly. reproduction ratio. • The speed of forward
  • Canon PC770 | Service Manual - Page 51
    drum axis is varied by the lens drive system and that around the drum the direction of the drum axis; the length of drum by moving the No. 1 mirror faster the peripheral speed of the drum. DIRECT Optical path I 4 the same as the peripheral speed of the drum. 2. The length of the optical path
  • Canon PC770 | Service Manual - Page 52
    MOPERATIONS AND TIMING / / \ Copyboard glass ENLARGE REDUCE n u o Lens array Photosensitive drum Movement in ENLARGE, REDUCE \ :- / i i J [--- No. 4/5 mirror unit Figure 3-202 3 - 12 COPYRIGHT © 1994 CANON INC. CANON PC7201740/750D70 REV.O AUG.1994 PRINTED IN JAPAN (IMPIIME AU JAPON)
  • Canon PC770 | Service Manual - Page 53
    J to ENLARGE Lens home position Lens unit sensor (PS2) Lens travel detecting shaft for side blank exposure lamp DC controller PCB Figure 3-203 COPYRIGHT © 1994 CANON INC. CANON PC7201740f750M0 AEU AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPAN) 3 - 13
  • Canon PC770 | Service Manual - Page 54
    distance over which the scanner travels varies according to the length of copy paper and the selected reproduction ratio. The scanner motor drives the lens driver circuit DC controller PCB 3 - 14 COPYRIGHT © 1994 CANON INC. CANON PC729R4017501170 REV.O AUG. 1994 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC770 | Service Manual - Page 55
    signal. The forward travel distance varies depending on the length of copy paper* and the selected reproduction ratio in ENLARGE: if the ratio is of how the length of copy paper is checked, see p. 3-44. COPYRIGHT © 1994 CANON INC. CANON PC720174017501170REV.O AUG.1994 PRINTED IN JAPAN (MPRIME AU
  • Canon PC770 | Service Manual - Page 56
    Operation The microprocessor (Q101) on the DC controller PCB receives such instructions as copying modes and reproduction ratios from the control panel circuit; and, in SC-B` g M2 Figure 3-207 3 - 16 COPYRIGHT © 1994 CANONINC. CANON PC7207401150IT10REV.0 AUG.1994 PRINTEDINJAPAN(mput AU JAPAN)
  • Canon PC770 | Service Manual - Page 57
    Outline The copier's image formation Drum cartridge Cartridge color detection Static eliminator Transfer roller Q101 Microprocessor DC controller PCB fluorescent lamp driver High-voltage circuit 4 O900 Microprocessor Composite power supply PCB Figure 3-301 COPYRIGHT 1994 CANON INC. CANON
  • Canon PC770 | Service Manual - Page 58
    sec (approx.) ■ OEM DIRECT, 2 Copies, Continuous; Copy Start key pressed immediately after power-on n Power switch ON I r-Copy Start key ON INTR SCFW SCRV SCFW SCRV 3-303 2.0 sec approx.) 3 - 18 COPYRIGHT © 1994 CANON INC. CANON PCT211147913P3 REM AUG.(994 PRINTEDIN JAPAN (IMPR(ME AUMON)
  • Canon PC770 | Service Manual - Page 59
    only after the intensity of the fluorescent lamp has stabilized. The copier does not start copying operation until the intensity of the fluorescent lamp has been checked power supply PCB Figure 3-304 COPYRIGHT © 1994 CANON INC. CANON PC720t740R50/770 REV.O AUG.1994 PRINTED IN JAPAN fMPRIME AU
  • Canon PC770 | Service Manual - Page 60
    remains on. a. Controlling Pre-Heating before the Scanning Lamp Turns On When the Copy Start key is pressed, the microprocessor (O101) on the DC controller PCB sends the ',decreased intensity 3 - 20 COPYRIGHT © 1994 CANON INC. CANON PC720174ORMO REV.0 AUG.1994 PRINTED IN JAPAN ompRimt All JAPON)
  • Canon PC770 | Service Manual - Page 61
    activation pre-heating is over, the microprocessor (Q101) on the DC controller PCB instructs the microprocessor (Q900) on the composite power supply PCB to generate the scanning scanning lamp. COPYRIGHT © 1994 CANON INC. CANON PC720/7401150770 REY.0 AUG.1994 PRINTED IN JAPAN 0mpuit AU JAPAN) 3
  • Canon PC770 | Service Manual - Page 62
    charging roller is given both DC and AC biases so as to maintain the surface potential of the photosensitive drum to a specific value. The DC bias is switched according to whether or not a copy image is being formed. Reference: DC component: -400/-625V AC component: 1700 Vpp to 3000 Vpp AC power
  • Canon PC770 | Service Manual - Page 63
    the DC/AC Bias When the Copy Start key is pressed, the microprocessor on the DC controller PCB instructs the microprocessor on the composite power supply the DC Bias Voltage Level The copier switches the level of the DC bias voltage according to whether or not copy images are being formed. The DC
  • Canon PC770 | Service Manual - Page 64
    copying operation. While the photosensitive drum is rotating, except during development, about -500 V is applied to the developing cylinder regardless of the position of the density adjusting lever, thereby preventing adhesion of excess toner 1994 CANON INC. CANON PC72074017501710 REIM AUG.1994
  • Canon PC770 | Service Manual - Page 65
    the DC bias. 3. Turning the AC Component On and Off About 3.5 sec after the Copy Start key is pressed, the microprocessor on the DC controller PCB sends the developing AC AC bias supply. COPYRIGHT © 1994 CANON INC. CANON PC720114011501710 REVD AUG. 1994 PRINTED IN JAPAN ompnimt AU JAPON) 3 - 25
  • Canon PC770 | Service Manual - Page 66
    of the DC Bias to Suit the Copy Density Setting The copier varies the DC bias control signal (DCBPWM) according to the settings shown below to vary the DC component voltage, thereby controlling the copy density. • setting of the density adjusting lever (manual control mode) • output of the AE sensor
  • Canon PC770 | Service Manual - Page 67
    Position of SW101 Right Center Left Copy density adjusting lever 1 3.5 0 6.5 9 -100 - -200 - -300 - -400 - -500 - V Developing bias DC component (V) Manual Mode Figure 3-313 Position of SW101 Right Center Left COPYRIGHT C 1994 CANONINC. CANON PC7201740R50/770 REV.0 AUG. 1994 PRINTED
  • Canon PC770 | Service Manual - Page 68
    transfer roller moving from the photosensitive drum because of a jam. To remove such toner, the copier applies a positive voltage at a specific timing to return the toner from the transfer roller to the photosensitive drum. • during initial rotation after the Copy Start key is pressed. • while the
  • Canon PC770 | Service Manual - Page 69
    of the DC bias (cleaning). Transfer Photosensitive charging drum roller former 1302 +24V tl Voltage77-/control circuit Trans -2 C0..00.1,.E Microprocessor DC control PCB Figure 3-315 COPYRIGHT © 1994 CANONINC. CANON PC72017401T50/770 REV.0 AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPON) 3 -
  • Canon PC770 | Service Manual - Page 70
    Copying The copier automatically corrects the application voltage during copying operation to compensate for the changes in the transfer efficiency caused by different types of copy paper circuit. 3 - 30 COPYRIGHT © 1994 CANON CANON PC72011401150= RBA AUG.1994 PRINTED IN JAPAN (IMPRNE AU JAPONI
  • Canon PC770 | Service Manual - Page 71
    long as the original has an even overall density, the AE mechanism ensures the generation of copies without fogging by varying the DC component of the developing bias to suit the density of the original. The copier's AE mechanism does not execute an AE scan; rather, it measures the density of the
  • Canon PC770 | Service Manual - Page 72
    . 20 mm 28 mm (approx.) (approx.) Center of imAge 56 mm (approx.) : AE sensor reading area Figure 3-317 3. Basic Sequence of Operations (AE measurement) Copy Start key ON STBY INTR SCFW SCRV SCFW iSCRV LSTR Main motor (M-I) Scanner motor (M2) Scanning lamp (FU) AE sensor input "sRuevmerse Pre
  • Canon PC770 | Service Manual - Page 73
    the newspaper from the copyboard, and place a stack of five sheets of copy paper on the copyboard glass instead; then, close the copyboard cover. 8) Turn .1102 J. 0 VR 03 Figure 3-322 COPYRIGHT 1994 CANON INC. CANON PC7201740f15V770 REV.O AUG.1994 PRINTED IN JAPAN ompromt AU JAPON) 3 -
  • Canon PC770 | Service Manual - Page 74
    the steps starting with step 1) once again. • If the problem cannot be corrected after going through the steps once again, use the density correction switch (SW101). 0 D SW101 Figure 3-323 3 - 34 COPYRIGHT © 1994 CANON INC. CANON PC720/74750/770 REY.0 AUG.1994 PRINTEDINJAPANpMPRIMEAU JAPON)
  • Canon PC770 | Service Manual - Page 75
    OPERATIONS AND TIMINGMUM H. Controlling the Side Blank Exposure 1. Outline The copier is equipped with a side blank exposure lamp at the front and the rear to prevent adhesion of toner to the drum when reduced copies are made. 2. Operation The side blank exposure lamp moves based on the travel
  • Canon PC770 | Service Manual - Page 76
    on the photosensitive drum; it is then moved to the transfer, separation, feeding, and fixing assemblies before it is discharged to the copy tray. The copier is equipped with three sensors to monitor the movement of copy paper. No. Name Remarks PS3 Delivery paper sensor Q751 Pre-registration
  • Canon PC770 | Service Manual - Page 77
    ( PS3 Copy tray Fixing assembly Cassette cc o -2) 0 0 "rTI cr, Photosensitive 1: Multifeeder pick-up roller drum a_ 0_ Registration roller A Static eliminator Q751 Cassette pick-up roller Holding plate Figure 3-401b (PC750/770) COPYRIGHT OO 1994 CANON INC. CANON PC720f14011501170 REV
  • Canon PC770 | Service Manual - Page 78
    Controlling the Pick-Up Roller 1. Outline The construction of the copier's pick-up roller differs depending on the model. The serves to control the copy paper so that it matches the leading edge of the image on the photosensitive drum. 3 - 38 COPYRIGHT © 1994 CANON INC. CANON PC72O740(750!T70 REV
  • Canon PC770 | Service Manual - Page 79
    pick-up roller 0 Spring clutch Control ring Copy paper Figure 3-402a (PC720/740) DC controller PCB SL1 M1 t Spring clutch Control ring Pawl Cassette pick-up roller Copy paper COPYRIGHT © 1994 CANON INC. Figure 3-402b (PC750/770) CANON PC720740I750710 REVD AUG.1994 PRINTED IN JAPAN omput
  • Canon PC770 | Service Manual - Page 80
    roller, which controls the copy paper so that its leading edge matches the leading edge of the image on the photosensitive drum. DC controller PCB 0 U- PA1 O Copy paper Singlefeeder paper sensor (PS7) Figure 3-403 3 - 40 COPYRIGHT © 1994 CANON INC. CANON PC720I740fT50770 REV.0 AUG.1994
  • Canon PC770 | Service Manual - Page 81
    edge of the image on the photosensitive drum. DC controller PCB rLnL 2 SL1 Cam SL4 gear *TP MI Copy paper Spring clutch Lifter Control ring Pawl Gear unit Multifeeder pick-up roller Paper guide plate Figure 3-404 COPYRIGHT © 1994 CANON INC. CANON PC120.740750i7i0 REV.O AUG.1994 PRINTED
  • Canon PC770 | Service Manual - Page 82
    the copy paper to the photosensitive drum. Spring clutch Control ring Registration roller Paper detecting lever Pawl ---- III SL2 41.1 Co CC Copy paper 0 0 Preregistration roller sensor (Q751) DC controller PCB RPD Figure 3-405 3 - 42 COPYRIGHT OO 1994 CANON INC. CANON PC720170750
  • Canon PC770 | Service Manual - Page 83
    1 copy) Copy paper in V STBY INTR SCFW SCRV LSTR STBY Main motor Singlefeeder paper sensor (PS7) Pre-registration paper sensor ( turns on when the singlefeeder paper sensor (PS7) remains on for about 0.3 sec continuously. Figure 3-407 COPYRIGHT © 1994 CANON INC. CANON PCT20/740/7501170 REV.O
  • Canon PC770 | Service Manual - Page 84
    mm) - 10 (mm) 92 (mm/s): speed at which copy paper is moved. 11 (mm): distance between pre-registration sensor and registration roller. 10 (mm): length of actuator of the pre-registration sensor. Figure 3-408 3 - 44 COPYRIGHT © 1994 CANON INC. CANON PC72011401750770 REV.O AUG.1994 PRINTEDINJAPAN
  • Canon PC770 | Service Manual - Page 85
    thermistor (TH2) to check for overheating. M1 Main motor Thermistor Tension roller Delivery roller Fixing film Fixing heater Lower fixing roller Figure 3-409 COPYRIGHT © 1994 CANON INC. CANON PC72017401750/170 REY.° AUG.1994 PRINTED IN JAPAN pmpRimt AU JAPON) 3-45
  • Canon PC770 | Service Manual - Page 86
    end temperature detection TH2 TH Fixing heater temperature detection _J Fixing heater Fixing heater end overheating detection circuit Fixing heater error temperature detection circuit Timer circuit HTNG Microprocessor HTOFF HTRD you Composite power supply PCB Figure 3-410 DC controller PCB
  • Canon PC770 | Service Manual - Page 87
    copier keeps track of the number of copies Copies 1 to 9 10 to 14 15 to 19 20 to 24 25 to 29 30 or more 1 to 9 10 to 14 15 to 19 20 or more 1 to 9 10 or more Table 3-401 Control temperature 215°C 210°C 205°C 200°C 195°C 190°C 205°C 200°C 195°C 190°C 195°C 190°C COPYRIGHT O 1994 CANONINC. CANON
  • Canon PC770 | Service Manual - Page 88
    motor (M1) Fixing heater (H1) 215°C 210°C 205°C 200°C Copying Copy Start Copying end /key ON end STBY 100°C Accumulated number of copies since power-on 1 9 15 20 Figure 3-411 3 - 48 COPYRIGHT © 1994 CANON INC. CANON PC72O740115O970 REV.O AUG.1994 PRINTED IN JAPAN omPnimt AU JAPON)
  • Canon PC770 | Service Manual - Page 89
    (M1) Fixing heater (H1) 225°C 220°C 215°C 210°C 200°C , 100°C Copying Copy Start Copying end 7 - key ON end STBY C. in. Accumulated mh f nn since power-on 1 4 10 15 20 Figure 3-412 COPYRIGHT © 1994 CANON INC. CANON PC7294740f7501770 REVD AUG.1994 PRINTED IN JAPAN prat AU JAPON
  • Canon PC770 | Service Manual - Page 90
    execution of thermal control of the fixing heater. To correct possible problems, the copier compensates for the variations in terms of seven settings of the resistance 413 0 0 Figure 3-414 3 - 50 COPYRIGHT © 1994 CANON INC. CANON PC120/74017501710 REVS AUG.1994 PRINTED IN JAPAN pipmmt AU JAPONI
  • Canon PC770 | Service Manual - Page 91
    in areas where paper does not come into contact while copies are made continuously on paper of A4 or small- er. In multifeeder manual mode, if , the copier will respond to a press on the Copy Start key. If an error associated with the heater is detected during copying operation, the copier once again
  • Canon PC770 | Service Manual - Page 92
    displacement, the copier is equipped with a correction mechanism. The fixing film displacement correction mechanism consists of the following four parts: • tension sensor (PS4) turns on, the fixing film is stopped and an error code (E0 and 07 alternately flashed) is indicated on the control panel.
  • Canon PC770 | Service Manual - Page 93
    tension wire decreases, thereby causing the balance spring to lift the front of the tension roller by way of the swing arm. COPYRIGHT 1994 CANONINC. CANON POT20174075EITTOREV.OAUG.1994 PRINTEDIN JAPAN(mPRimt AU JAPON) 3 - 53
  • Canon PC770 | Service Manual - Page 94
    copier enters standby state. If `E007' does not disappear after executing the above fixing film displacement correction mode, see the instructions under "Correcting the Displacement of the Fixing Film" in the Service Handbook (p.2-10). 3 - 54 COPYRIGHT © 1994 CANONINC. CANON PC72084017501170REVD
  • Canon PC770 | Service Manual - Page 95
    be reset to standard mode when you open the copier to remove jams. The microprocessor has the following five 'no paper/jam' detection sequences, and it also identifies a jam if any of the sensor detects copy paper at power-on. 1. Absence of Paper in the Multifeeder Pick-Up Assembly (pick-up delay
  • Canon PC770 | Service Manual - Page 96
    motor (M1) 2.1 sec No paper 1.5 sec Figure 3-422 (no paper) Copy Start key ON STBY INTR SCFW Pick-up clutch solenoid (SL1) Jam check Registration sensor (Q751) Main motor (M1) 2.1 sec No paper Jam 1.5 sec Figure 3-423 (jam) 3 - 56 COPYRIGHT © 1994 CANON INC. CANON PC720/74017501/70 REV
  • Canon PC770 | Service Manual - Page 97
    , the copier identifies a pick-up delay jam, stops copying operation, and flashes the Jam message. Copy paper inserted STBY INTR SCFW Singlefeeder paper sensor (PS7) Jam check Registration sensor (Q751) Main motor (M1) 2.1 sec k Jam 1.5 sec Figure 3-425 - COPYRIGHT © 1994 CANON INC. CANON
  • Canon PC770 | Service Manual - Page 98
    Figure 3-426 5.0 sec S 4 Jam s1e.5c 4. Delivery Delay Jam If copy paper does not reach the delivery sensor within a specific period of time because of a feeding problem, the copier identifies a delivery delay jam, stops copying operation, and flashes the Jam message. Copy Start key ON 81
  • Canon PC770 | Service Manual - Page 99
    OPERATIONS AND TIMING= V. FAN The copier is equipped with one fan which serves to discharge ozone and cool the inside of the machine. The fan is driven directly by the main motor (WI) by means of a belt Fan Figure 3-501 COPYRIGHT © 1994 CANON INC. CANON PC72017407501710 Rat) AUG.1994 PRINTEDIN
  • Canon PC770 | Service Manual - Page 100
    lamp +5pY Main motor/ +24V►U main motor driver PCB O Fixing heater Scanning lamp Primary charging roller Developing roller Transfer roller Static eliminator 3 - 60 COPYRIGHT © 1994 CANON INC. CANON PC720/7401750(170 REY.O AUG.1994 PRINTED IN JAPAN pmPRimt AU JAPON)
  • Canon PC770 | Service Manual - Page 101
    up data on error codes (E000, E001, E002, E003), the copier uses the capacitor (C123) located within the DC controller circuit. When any of these codes (E000, E001 between -15% and +10°/0. COPYRIGHT © 1994 CANON INC. CANON PC720/14017501770 REVD AUG. 1994 PRINTED IN JAPAN ompRat AU JAPON) 3 - 61
  • Canon PC770 | Service Manual - Page 102
    switch 0 0 Control pane C123 DC controller PCB Microprocessor (0900) Power supply Figure 3-602 Main transformer T1O1 DC ►+5V power +24VR supply +24VU 3-62 COPYRIGHT © 1994 CANON INC. CANON PC720174017501770 REV.O AUG.1994 PRINTED IN JAPAN iimPRimt AU JAPON)
  • Canon PC770 | Service Manual - Page 103
    copier's composite power supply PCB is equipped with a microprocessor (Q900) which serves to run a self diagnosis program to check the output from each power supply and its communications with the DC controller PCB. When an error transfer bias 3. Error in the Control opening the copier's top unit
  • Canon PC770 | Service Manual - Page 104
    VII. STANDARDS AND ADJUSTMENTS 1. Actions to Take After Replacement Part Work Scanning lamp 1. adjust the intensity of the scanning lamp fine-adjust reproduction ratio Table 3-701 3 - 64 COPYRIGHT © 1994 CANON INC. CANON PC720/740850/770 REV.O AUG. 1994 PRINTED IN JAPAN (IMPRIME AU JAPAN)
  • Canon PC770 | Service Manual - Page 105
    parts: • DC controller PCB • composite power supply PCB • AE/intensity sensor PCB • scanning lamp Preparing for Adjustment 1) Set the black cartridge in the copier large titles. • Obtain five sheets of copy paper. • Make sure that the intensity of CANON INC. CANON PC7201740R50M0 REV.O AUG.1994 PRINTED IN JAPAN
  • Canon PC770 | Service Manual - Page 106
    7) Remove the newspaper from the copyboard, and place a stack of five sheets of copy paper on the copyboard glass in its place; then, close the copyboard glass. 8) Adjust .1109 0 VR 03 3-66 COPYRIGHT @ 1994 CANON INC. CANON PC72017401750/770 REVD AUG.1994 PRINTED IN JAPAN ompRimt AU JAPON)
  • Canon PC770 | Service Manual - Page 107
    sure the leading edge non-image width is 2.0 ±1.0 mm when the Test Chart is copied. 0 SW101 Figure 3-707 2.0± 1.0 [aim] Figure 3-708 1) Turn VR105 on Increases Counterclockwise Decreases Table 3-703 COPYRIGHT © 1994 CANON INC. CANON PC720/7401750M0 RED AUG.1994 PRINTED IN JAPAN (IMPRIME AU
  • Canon PC770 | Service Manual - Page 108
    Adjustment Make sure that the leading edge margin is 0.2 to 5.0 mm when the Test Chart is copied. O.2 to 5.O [mm] Figure 3-710 1) Turn VR104 on the DC controller PCB so that replacement. 3 - 68 COPYRIGHT © 1994 CANONINC. CANON PC72017401750fT/0REV.OAUG.1994 PRINTEDIN JAPAN ompRimtAUJAPON)
  • Canon PC770 | Service Manual - Page 109
    J rc c), O00O 0000 I 1 Figure 3-713 3) Make checks according to the instructions. Reference: The photointerrupters other than those indicated are connected in a matrix. OPERATIONS AND TIMING= COPYRIGHT © 1994 CANON INC. CANON PC720/7401150770 REVD AUG.1994 PRINTED IN JAPAN RAPPoit AU JAPON
  • Canon PC770 | Service Manual - Page 110
    over the sensor is not over the is not moved sensor When the detecting lever is not moved 0 V 5 V 5 V 0 V Table 3-705 3 - 70 COPYRIGHT CO 1994 CANONINC. CANON PC720174017501770REV.O AUG.1994 PRINTEDIN JAPAN (Imprdmt AU JAPON)
  • Canon PC770 | Service Manual - Page 111
    The copier's DC controller PCB is equipped with a microprocessor that checks the state of the machine (sensors in particular); when it identifies an error, it indicates it in the copy counter on the control panel. In the case of `E001', `E0' and '01' are flashed alternately. Code E Cause
  • Canon PC770 | Service Manual - Page 112
    OPERATIONS AND TIMING Code EMI" LOW 4 4 Cause • Thermistor (TH1, TH2; faulty) detected by the thermistor (TH1) has exceeded 150°C during copying operation and maximum power is applied for 10 to 14 sec COPYRIGHT © 1994 CANON INC. CANON PCT20/74017501T70 ARO AUG.1994 PRINTED IN JAPAN (IMPRIME AU
  • Canon PC770 | Service Manual - Page 113
    Code Cause error is detected in the communication between the DC controller PCB and the composite power supply PCB. • The intervals in the zero-cross signals is greater than allowed. • The +24V power supply deviates from the control value by ±20% during copying. COPYRIGHT © 1994 CANON INC. CANON
  • Canon PC770 | Service Manual - Page 114
  • Canon PC770 | Service Manual - Page 115
    the washer for reassembly. 4. If possible, avoid operating the machine with any of its parts removed. 5. Unless otherwise noted, reassembly is the reverse of FIXING SYSTEM VII. ELECTRICAL SYSTEM COPYRIGNT CO 1991 CANON NC. CANON PC/2074005770 REV.0 ma 1991 PRINTED IN JAPAN input AU JAPON, 4-28 4-
  • Canon PC770 | Service Manual - Page 116
    • " • • ;:•40 '5 ., C re k •••s „.A.....%.q...,..V......,...% i 4:,•v,••.,,i4,.o,%.'v.•4 0• 01•,•:44 ,, , ...t.Af. • • %•.•• tf •
  • Canon PC770 | Service Manual - Page 117
    check, or repair the inside of the machine. Covers that may be detached by mere removal of the mounting screws are omitted from the discussions. • 1. Removing the Upper Cover 1) Remove the copyboard cover. • 2) Open the copier 1994 CANON INC. CANON PC720/7401150/770 REVD AUG.
  • Canon PC770 | Service Manual - Page 118
    (D; then, remove the multi- feeder/single feeder unit. pti I Figure 4-105 02 3 6) Remove the screw ®, and remove the copyboard cover support retainer S. Figure 4-108 4 - 2 -e Figure 4-106 COPYRIGHT 1994 CANON INC. CANON PC72017401750/770 REV.O AUG.1994 PRINTEDIN JAPAN (IMPRIMAEUJAPON)
  • Canon PC770 | Service Manual - Page 119
    cover S. B. Control Panel 1. Removing the Control Panel 1) Open the copier's top unit. 2) Remove the two screws C), and remove the front upper select multifeeder mode and make one copy. 00 0 Figure 4-112 COPYRIGHT © 1994 CANON INC. CANON PC720174017501770 REY.O AUG.1994 PRINTEDINJAPAN oMPRIMEAU
  • Canon PC770 | Service Manual - Page 120
    ®. O O O Figure 4-113 5) Move the density adjusting lever to ®. the right; then, disengage the claw a and remove the control panel ©0 0 sza 00 0 Figure 4-114 4 - 4 COPYRIGHT © 1994 CANON INC, CANON PC72074017501770 REPO AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC770 | Service Manual - Page 121
    four screws and remove the lens cover a I 1- 1 ill 0 Figure 4-201 3) Loosen the two screws ®, and remove the copyboard glass S. © 0 Figure 4-203 5) Open the copier's top unit further, and fix it in position using the grip of a screwdriver or the like (30 mm dia.). \\\ \ \ \ GO D Figure 4-202
  • Canon PC770 | Service Manual - Page 122
    !MECHANICAL SYSTEM ® 6) Remove the two fixing screws for the scanner drive motor. U I IIlI I I II IIIII Figure 4-205 7) Free the copier's top unit by removing the screwdriver, and close it. 8) Remove the E-ring C), and lift the cable drive pulley CO slightly to remove the scanner drive
  • Canon PC770 | Service Manual - Page 123
    2. Routing the Scanner Drive Cable MECHANICAL SYSTEMNM ;e, O 0 Figure 4-207 COPYRIGHT © 1994 CANON INC. CANON PC720174011501770 REV.O AUG.1994 PRINTEDIN JAPAN (NPRIME AU JAPON) 4 - 7
  • Canon PC770 | Service Manual - Page 124
    (FY9-3009-020) • adhesive tape 1) Adjust the mirror positioning tool to suit the copier. 7) Remove the four screws CD, and remove the lens cover T. g 3 0 Figure end 6 3 Figure 4-211 4 - 8 COPYRIGHT © 1994 CANON INC. CANON PC720I74011501/70 REV.0 AUG. 1994 PRINTED IN JAPAN pmpRimt AU JAPON)
  • Canon PC770 | Service Manual - Page 125
    the cable; then, hook the cable as shown and fix it in position with adhesive tape CZ. 8 0 0 0 Figure 4-213 Figure 4-215 Figure 2-216 COPYRIGHT 1994 CANON INC. CANON PC720/74017501T70 REVD AUG.1994 PRINTED IN JAPAN pont AU JAPON) 4 - 9
  • Canon PC770 | Service Manual - Page 126
    end of the cable in position temporarily, and hook the cable as shown and fix the rear end in position. 0 / . Figure 4-220 4 - 10 COPYRIGHT © 1994 CANON INC. CANON PC12017401750M0 REV.O AUG.1994 PRINTED IN JAPAN oMPRIME AU JAPON)
  • Canon PC770 | Service Manual - Page 127
    ) Fix the rear and the front of the No. 1 mirror mount © temporarily in position. D / © Figure 4-223 (rear) 0 0 Figure 4-224 (front) z 6 Figure 4-225 (rear) COPYRIGHT © 1994 CANON INC. CANON PC720/744750I770 REVD AUG.1994 PRINTEDIN JAPANEMPRIME AUJAPON) 4 -11
  • Canon PC770 | Service Manual - Page 128
    Figure 4-227 (rear) 19) Fix the rear and the front of the No. 1 mirror mount ® in position. D 0 0 Figure 4-229 Figure 4-228 (rear) 4 - 12 COPYRIGHT © 1994 CANON INC. CANON PC720/7401750R70 REV.O AUG.1994 PRINTEDIN JAPAN ompnimt AU JAPONI
  • Canon PC770 | Service Manual - Page 129
    are positioned with reference to the markings. 00 ao 0 00 Figure 4-233 10) Remove the spring 0 from the tensioner 0 0 0 Figure 4-231 Figure 4-234 COPYRIGHT © 1994 CANON INC. CANON PC72017401150I770 RUG AUG. 1994 PRINTED IN JAPAN punk AU JAPON) 4 - 13
  • Canon PC770 | Service Manual - Page 130
    4-236 • 2 0 2 O 2 Figure 4-237 3) Remove the seven screws (D; then, while disengaging the claw ©, remove the composite power supply PCB Q. 3 O • 4 - 14 COPYRIGHT © 1994 CANONINC. 0 0 OO Figure 4-238 CANON PC72017401150M0REV.OAUG.1994 PRINTEDINJAPANNMPRIMt AU JAPON)
  • Canon PC770 | Service Manual - Page 131
    sure to attach the fan belt. After attaching the fan belt, make sure that the belt is free of twists. 00 0 U Figure 4-240 COPYRIGHT 1994 CANON INC. CANON PC720/7401150M0 REV.O AUG.1994 PRINTED IN JAPAN MARINE AU JAPOIN 4 - 15
  • Canon PC770 | Service Manual - Page 132
    MNMECHANICAL SYSTEM 2. Removing the Main Drive Assembly 1) Remove the top cover. 2) Disconnect the ten connectors O from the composite power supply PCB 0. (D. 4) Remove the insulating sheet O /1/ 2 c), 0 0 0 0 11 /1/ Figure 4-242 3) Remove the seven screws 0; then, while disengaging the claw
  • Canon PC770 | Service Manual - Page 133
    . Figure 4-301 3) Remove the spacer O. 0 Figure 4-302 0 0 Figure 4-303 e, 5) While removing the bushing remove ®. the cassette pick-up roller unit 0 0 © OO Figure 4-304 COPYRIGHT © 1994 CANON INC. CANON PC7201140(750/770 REY.0 AUG.1994 PRINTED IN JAPAN omPRimEAUJAPON) 4 - 17
  • Canon PC770 | Service Manual - Page 134
    switch, and select multifeeder mode; then, press the Copy Start key. 2) When the pick-up gear unit top cover. (See "Removing the Top Cover.") 2) Open the copier's top unit, and fix it in position using the grip of © 1994 CANON INC. O 3 Figure 4-309 CANON PC7201740/7501770 REVD AUG.1994 PRINTED IN
  • Canon PC770 | Service Manual - Page 135
    2) Remove the front lower cover. (See "Removing the Front Lower Cover.") 3) Open the copier's top unit, and remove the spring (D. Figure 4-311 7) Free the clutch unit ® Figure 4-312 Figure 4-315 COPYRIGHT © 1994 CANON INC. CANON PC/20740750870 REV.O AUG.1994 PRINTEDIN JAPAN(gout AU JAPON) 4 -
  • Canon PC770 | Service Manual - Page 136
    disengaging the claw C). Figure 4-317 7) Remove the E-ring C) and the washer C); then, pull out the pick-up clutch O. 0 0 Figure 4-318 Figure 4-320 4 - 20 COPYRIGHT © 1994 CANON INC. CANON PC720/7401750/770 REVD AUG.1994 PRINTEDIN JAPAN phipmmt AU JAPON)
  • Canon PC770 | Service Manual - Page 137
    roller shaft. (See "1. Removing the Multifeeder Roller.") 2) Remove the pick-up tray. 3) Remove the stopper ® by disengaging the claw O. 0 Figure 4-325 Figure 4-323 COPYRIGHT © 1994 CANON INC. CANON PC7201740/750/710 REY.O AUG. 1994 PRINTED IN JAPAN fMPRIME AU JAPON) 4 - 21
  • Canon PC770 | Service Manual - Page 138
    the direction of the arrow; then, remove it together with the paper guide plate C). qaMP aoa Figure 4-326 2. Removing the Singlefeeder Pick the direction of the arrow. Figure 4-328 4) Disengage the claw ® of the paper guide plate ®, and remove the single- feeder pick-up roller ®. CT( Figure 4-327
  • Canon PC770 | Service Manual - Page 139
    e. E. Registration Roller (lower) 1. Removing the Registration Roller Unit 1) Open the copier's top body. 2) Remove the spring 0. iI 00 Figure 4-330 3) Remove the Figure 4-331 0 \ 3 Figure 4-333 COPYRIGHT 1994 CANON INC. CANON PC72017401150,710 RR° AUG.1994 PRINTED IN JAPAN omput AU JAPON) 4 -
  • Canon PC770 | Service Manual - Page 140
    S MECHANICAL SYSTEM 2. Removing the Registration Roller Clutch 1) Remove the registration roller unit. (See "1. Removing the Registration Roller Unit.") 2) Remove the two E-rings C). 0 4) While moving down the registration roller ©, detach it from the gear unit ®. 0 Figure 4-334 3) Remove the two
  • Canon PC770 | Service Manual - Page 141
    1) Open the copier's top unit. e. 2) Remove the screw ®, and remove the noise filter PCB cover 4) Remove the delivery roller S. O tt c. O°. 0 Figure 4-340 Figure 4-338 3) Push the claws ®, and shift the delivery roller gear unit ®. 3 oa O Figure 4-339 COPYRIGHT © 1994 CANON INC. CANON PC720
  • Canon PC770 | Service Manual - Page 142
    Scanning Lamp Install the scanning lamp so that the light-emitting portion (transparent glass) is on the left when viewed from the front of the copier. Light-emitting portion 0 0 Figure 4-401 Figure 4-402 (front view) 4 - 26 COPYRIGHT 4 1994 CANONINC
  • Canon PC770 | Service Manual - Page 143
    cartridge. 4) Remove the top cover. 5) Remove the DC controller PCB. 6) Remove the two screws C) from the rear of the composite power supply PCB (:). T U 0 0 7) Open the copier and the copier's lens is at the farthest left. Lamp PCB Figure 4-405 COPYRIGHT 1994 CANON INC. CANON PC72017401750M0 REV
  • Canon PC770 | Service Manual - Page 144
    period of time, the copies can come to show white spots or black bands; the drum cover shutter is provided to prevent such a problem. You should not open the drum cover shutter without good reason; it is designed to open when the cartridge is inserted into the copier and the copier's top unit is
  • Canon PC770 | Service Manual - Page 145
    T. 1) Open the copier's top body, and remove the cartridge. 2) Put the cartridge upside down, and open the drum shutter. 3) Clean the surface of the drum using a cloth coated with toner. Caution: 1. The drum must always bp rotated in the direction it rotates when making copies. Rotating it in the
  • Canon PC770 | Service Manual - Page 146
    Removing the Upper Fixing Unit 1) Open the copier's top unit. 2) Remove the two screws 0 CD Drive roller C) Tension roller © Fixing film ® Inlet guide © Lower fixing roller © Fixing heater Figure 4-601 Caution: The CANON INC. CANON PC7201749(750770 REVD AUG.1994 PRINTED IN JAPAN (wait AU JAPON)
  • Canon PC770 | Service Manual - Page 147
    DC con- troller PCB ®. Figure 4-606 7) While avoiding the fixing assembly shutter ©, remove the upper fixing unit 0 while holding it with copy paper. UG3G Figure 4-605 0 Figure 4-607 COPYRIGHT © 1994 CANON INC. CANON PC72017401750R70 REV.0 AUG.1994 PRINTED IN JAPAN ompRitit AU JAPON) 4 - 31
  • Canon PC770 | Service Manual - Page 148
    copier's top unit. 2) Remove the delivery roller. (See "1. Removing the Delivery Roller' under "E. Delivery Assembly.") 3) 5) Remove the inlet guide retainer CI, and remove the inlet guide the inlet guide ©. Figure 4-610 Figure 4-609 4 - 32 COPYRIGHT © 1994 CANON INC. CANON PC720(7401750ITIO
  • Canon PC770 | Service Manual - Page 149
    SYSTEM A. DC Controller PCB 1. Removing the DC Controller PCB 1) Open the copier's top unit. 2) Remove the two screws C), and remove the front upper 0. 3 PF017, *1° O0 Figure 4-702 Figure 4-701 COPYRIGHT © 1994 CANONINC. CANON PC720R40R501770 REVA AUG.1994 PRINTEDINJAPAN(INPRIMEAUJAPON) 4 - 33
  • Canon PC770 | Service Manual - Page 150
    Open the copier's top unit. 2) Remove the left cover and the rear cover. 3) Remove the screw CD, and remove the copyboard cover support retainer O. Supply PCB Some capacitors on the composite power supply hold charges when the copier's power supply is off. Take extra care never to short the terminals
  • Canon PC770 | Service Manual - Page 151
    CHAPTER 5 INSTALLATION I. SELECTING THE SITE II. UNPACKING AND INSTALLATION 5-1 III. RELOCATING THE COPIER 5-7 5-2 COPYRIGHT 0 1994 CANON INC. CANON PC720174017507770 ARO AUG. 1994 PRINTED IN JAPAN (IMPRIME AU JAPOID
  • Canon PC770 | Service Manual - Page 152
  • Canon PC770 | Service Manual - Page 153
    ; pay a visit to the user's before the delivery of the machine: • The site should have ventilated. The amount of ozone generated by the copier while in use will not affect the health of the machine. 10 cm min. . Figure 5-101 10 cm min. INSTALLATIONEN COPYRIGHT © 1994 CANON INC. CANON
  • Canon PC770 | Service Manual - Page 154
    tray 0 Power cord C) User's Manual C) Copying Guide Warranty card 2 Remove the screw from the copier's left side. a OJT 3 Detach the tapf to remove the shipping attachment on the right side of the copier. Shipping attachment 5 - 2 COPYRIGHT © 1994 CANON INC. CANON PC720R401750/70 REV.O AUG
  • Canon PC770 | Service Manual - Page 155
    out the cartridge from the copier. 2- - 1 _ 40 1 1 -7= - z_ _- -_----_5-__. L=-- --, Roller 8 Hold the cartridge level, with the warning label facing up; and rotate it about 90° in both directions several times. r E re ) COPYRIGHT © 1994 CANONINC. CANON PC720I74017501770REV.O AUG
  • Canon PC770 | Service Manual - Page 156
    the cartridge with the warning label facing up, and insert the cartridge with care until it stops. Checks/remarks 11 Push the icon on the copier's on the power switch. the copy count/ratio indicator indicates 'P', and the Add Paper message flashes. • Press the Copy Count/Zoom Set key and Clear
  • Canon PC770 | Service Manual - Page 157
    side of the paper width guide. 16 Set the Test Sheet on the copyboard, and check copying operation. 17 Clean the copier's exterior and the area around it. • Make sure there is no abnormal noise. • Make sure that as many copies as specified are made normally. COPYRIGHT © 1994 CANON INC. CANON
  • Canon PC770 | Service Manual - Page 158
    from the copier. 2) Move the paper length guide inside the cassette to suit the length of the copy paper to be used. es Figure 5-201 3) Move the paper width guide inside the cassette to suit the width of the copy paper to be used. "'cis e. Figure 5-202 5 - 6 COPYRIGHT © 1994 CANON INC. CANON
  • Canon PC770 | Service Manual - Page 159
    4 Remove the cassette. 5 Remove the cartridge. Keep the cartridge in a protective box, and make sure it will not be subjected to vibration while in transit. 6 Tape the copier's top in place so that it will not open while in transit. 7 Place an A4 sheet of copy paper on the copyboard glass, and
  • Canon PC770 | Service Manual - Page 160
    ti;,z;~
  • Canon PC770 | Service Manual - Page 161
    CHAPTER 6 MAINTENANCE AND SERVICING I. PERIODICALLY REPLACED PARTS 6-1 II. DURABLES AND CONSUMABLES 6-1 III. SCHEDULED SERVICING 6-1 IV. POINTS TO NOTE WHEN HANDLING/STORING THE CARTRIDGE 6-2 COPYRIGHT@ 1994 CANONRC COON PertrOVW50770 REV.O AUG.1994 PAINTEDIN JAPAN FALPPoitE AU10040
  • Canon PC770 | Service Manual - Page 162
    O
  • Canon PC770 | Service Manual - Page 163
    on a periodical basis. II. DURABLES AND CONSUMABLES The copier does not have a part classified as a durable or consumable part. III. SCHEDULED SERVICING The copier has no part that must be serviced on a periodical basis. COPYRIGHT © 1994 CANON INC. CANON PC720/140R50M0 REU AUG.1994 PRINTEDIN JAPAN
  • Canon PC770 | Service Manual - Page 164
    is organic photoconductor (OPC), and deteriorates when exposed to strong light. The cartridge also contains toner, and it is important to advise the user to handle it with care to avoid soiling. Make sure that the cartridge is placed in a protective box for storage. 1. Storing after Removing the
  • Canon PC770 | Service Manual - Page 165
    setting the cartridge to the copier or if white spots appear on the copies as toner runs out, hold the cartridge level as shown in Figure 6-401 and rotate it about 90° in both directions several times to even out the toner inside it. Do not shake the cartridge in ways not instructed, or toner may
  • Canon PC770 | Service Manual - Page 166
  • Canon PC770 | Service Manual - Page 167
    -VOLTAGE CONTACT CIRCUIT DIAGRAM A-26 K. BLANK EXPOSURE (front) CIRCUIT DIAGRAM A-27 L. BLANK EXPOSURE (rear) CIRCUIT DIAGRAM A-28 M. SPECIAL TOOLS A-29 N. SOLVENTS/OILS A-30 COPYRIGHT © 1994 CANON INC. CANON PC72017401759/710 REAM AUG. 1994 PRINTED IN JAPAN NMPRIME AU JAPON)
  • Canon PC770 | Service Manual - Page 168
  • Canon PC770 | Service Manual - Page 169
    , DIRECT, from cassette) Power switch ON Copy Start key ON Sequence STBY INTR A. GENERAL TIMING CHART SCFW SCRV SCFW SCRV LSTR STBY COPYRIGHT t994 CANON INC. 1 Main motor (M1), Side blank lamp (front, rear) 2 Scanner motor (M2) Scanner home position sensor (PS1) 1 Lens home position
  • Canon PC770 | Service Manual - Page 170
    CLUTCH SOLENOID DRIVE command REGISTRATION CLUTCH SOLENOID DRIVE command REGISTRATION PAPER DETECTION signal SIDE BLANK EXPOSURE LAMP ON signal SCANNER MOTOR LAST ROTATION CBFW COPY BOARD FORWARD CBRV COPY BOARD REVERSE STBY STANDBY COPYRIGHT © 1994 CANON INC. CANON PC72017401750I170 REV.O
  • Canon PC770 | Service Manual - Page 171
    ARTRIDOE SLOP NSOR I 2a 975 J751F 0752 PREREGISTRATION ROLLER PAPER SENSOR CASSETT PAPER SENSOR EL115 PICK UP CLUTCH SOLENOID a-2Ln 9Lan W05I0T OILY FOR PC750/770 I R I A l ''7 6J2lid * SINGLE FEEDER PAPER SENSOR J1 • 612 PS SCANNER/LENS OR /VE MOTOR SCANNER HOME POSITION SENSOR
  • Canon PC770 | Service Manual - Page 172
  • Canon PC770 | Service Manual - Page 173
    0 P5 IsreVcr , 0 +5,/ 27 0105 U rig P6 176. 6 P6 6 P6. +5V +5V 0 CLR 4Z're,12gfVA C104 P8< > P A A A 5 • P3 / 8 P1 F13-1811 COPYRIGHT © 1994 CANON INC. CANON PC7201740IT50/T/0 REV.0 AUG.1994 PRINTEDIN JAPAN (IMPRIMAEU JAPON) A - 5
  • Canon PC770 | Service Manual - Page 174
    \, cc R277 +5V +24U R116 0110' P6 P8 P8 P8 +5V A - 6 109 0 0 CC I I-C106 +5V cc U SC. to U SC COMB SC B SC SC A A COPYRIGHT 0 1994 CANON INC. CANON PC720R4017501770 AEU AUG. 1994 PRINTED IN JAPAN ompRimt AU JAPON)
  • Canon PC770 | Service Manual - Page 175
    •rf +24VR 0106 2 4 C176 ,T,VR103 i 3 R121 M.A.--- C110 R120 '440* .---- C155 I +24VR A 0106 9 i+ R206 +5V C111 777 -I- 0166 II 777 O CP2 AE DATA C185 COPYRIGHT © 1994 CANON INC. CANON PC7201740R501770 REV.O AUG.1994 PRINTED IN JAPAN EMPRIME AU JAPON) A - 7
  • Canon PC770 | Service Manual - Page 176
    /INCH) I KR5 0190 2 I [230v/100v) I... (DIG1) EAT1 HEAT2 HTMK T YO ZS (DIG2) CPU NH JAM PPS300 DIG2 SFPO NH ABNOR 03I631 OPO CHECK M HEAT RUN DZGO 0061 DIG3 I DIGO I i J A - 8 COPYRIGHT © 1994 CANON INC. CANON PC72011401750R70 REV.O AUG.1994 PRINTED IN JAPAN phIPRIME AU JAPON)
  • Canon PC770 | Service Manual - Page 177
    +5V +5V A +5V 3107 R154 0153 IN a voa 2 IN A VU OUT% 4 CP3 -0 8275 0131 P8 cj T C167 C183 777 777 717 AEDS VR COPYRIGHT © 1994 CANON INC. CANON PC720(740/7501170 REY.0 AUG. 1994 PRINTED IN JAPAN (IMPRIME AU JAPON) A - 9
  • Canon PC770 | Service Manual - Page 178
    0 10 18 V' 18 .7 CU AI 0.1 II II II CI a70 R169 R167 ti F . Fi il 47 cc acc4cl CPS j_ *.0. HEAT_ERR8 LHP A - 10 COPYRIGHT @ 1994 CANON INC. CANON PC720r/4017501770 REV.O AUG.1994 PRINTED IN JAPAN ompRimt AU JAPAN)
  • Canon PC770 | Service Manual - Page 179
    Ti +5V 150 R213 M_TH 0161 +5V 0160 COMPCLR C158 +5V 0108 +5V 13151 R212 C160 P2 [HEAT_OFF1 0132 0133 HTRO P8 [HEAT_PMM) COPYRIGHT 1994 CANON INC. CANON PC7201/491750710 ARO AUG.1994 PRINTED IN JAPAN ompRimtAU JAPON) DC controller Circuit Diagram (7/8) RLOFFot A - 11
  • Canon PC770 | Service Manual - Page 180
    J117 :'? V U KR5 DIG2 KR4 DIGS KR6 KR7 0 J114 0 J114 0 J114 0 J114 0 J114 0 J114 DIG2 INH JAM YOBI3 PPS300 0 1 J115 0 2 J115 0 3 J115 0 4 j,,5 DIG3 0 5 J115 INH ABNOR02 J1,5 CHECK J4 CV COPYRIGHT © 1994 CANON INC. CANON PC72004011501170 REV.(' AUG.1994 PRINTED IN JAPAN ompRimt AU JAPON)
  • Canon PC770 | Service Manual - Page 181
    061 BP1006 0 i 0621 R614 R615 2 # 0611 C605 rr 0617 R604 R602 # 0608 2 7e C604 # L600 +5V 0710 AC_MONITOR C7 18 VR70 1 0111{ AC_MONI_VR COPYRIGHT © 1994 CANON INC. CANON PC720/740750770 REV.O AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPON) A - 13
  • Canon PC770 | Service Manual - Page 182
    9 MVJI 15 4 3 MV_J_ 16 24VOFF 14 7 * 24VOFFG 12 5VONG 12 * SVON 13 ,_ 24VON 10 24VONG 11 FLJI 2 FLJ1 * --T 1 C106 PROTECT # T104 R114 A - 14 COPYRIGHT © 1994 CANON INC. CANON PC720407501170 REV.0 AUG.1994 PRINTEDIN JAPAN oMPRIMEAU JAPON)
  • Canon PC770 | Service Manual - Page 183
    +54 1_ 2O1O3 +54 A +5V R129 0117 R123 C135 R127 >. 0 O C.P.i > +24VU CLIMIT a U R151 R15 +54 CISO 129 7128 CC C127 0116 O131 R171 COPYRIGHT 1994 CANON INC. CANON PC720174017501770 R91.0 AUG.1994 PRINTED IN JAPAN (MPRIME AU JAPON) A - 15
  • Canon PC770 | Service Manual - Page 184
    P _PC A - 16 PKON PAC_S +24V R591 +24V R550 2 0526 C561 R516 R514 C509 r T508 0 4 o C510 8520 -I I- 0511 R521 C611 P_AC C538 0 PRIMARY J209 COPYRIGHT © 1994 CANON INC. CANON PC720R401750M0 REY.0 AUG.1994 PRINTEDIN JAPAN OMPRIME AU JAPAN)
  • Canon PC770 | Service Manual - Page 185
    T201 R238 C221 12mA 3 2 R246 R249 +SFBT 0 1) 8247 R258 0205 ACEIAS DCBPWM R245 R244 R243 D215 BIASS COPYRIGHT C3 1994 CANON INC. CANON PC7211174017501770 REV.O AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPAN) C210 I I C212 I I N SZ o N 0 O II • C211 C214 0 o II • C213 8225 R254
  • Canon PC770 | Service Manual - Page 186
    ZD303 T101 L HVJ-1 R393 c317 TFWEQIEF VR301 TFOBCK 4@li no R381 C377 R318 R327 D306 C359 ii Tensha Output J210 p1I HV_LIMIT A - 18 COPYRIGHT © 1994 CANON INC. CANON PC720)7401750770 REV.O AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Canon PC770 | Service Manual - Page 187
    0495 R495 R497 01 0496 0431 +5FBT 44 •  V cr HC7 KC 11 CLR 0490 0 01 FLONII MPWMCLK +5FBT 74 4 Vu 670 C432 0490 COPYRIGHT 1994 CANON INC. CANON PC720114017501770 REVD AUG.1994 PRINTEDIN JAPAN pMPRIME AU JAPON) A - 19
  • Canon PC770 | Service Manual - Page 188
    -ACK* STBY/CPY. FL_PROT RLOFF* NMD FLPRHT* DVACON DVDCON PRDCON CPS_REQ J204 k 4 1001„ 401.r 0 0 2 2 3 9 4 . 5 2 6 2 7 PW_KEY MLOCK S_CLK S_OUT S_IN ZER_CRS FIT RD A - 20 COPYRIGHT © 1994 CANON INC. CANON PC720174011501770 REV.O AUG.1994 PRINTED IN JAPAN pMPRIME AU JAPON)
  • Canon PC770 | Service Manual - Page 189
    J301 012 SEG7 soAR408 J301 0 15 J302 J302 02 J303 O1 J303 02 1 _i!W409 0 02 J301 J301 VR401 +5V J301 +5V COPYRIGHT © 1994 CANON INC. oMPRIME CANON PC720R40a50(770 REV.9 AUG.1994 PRINTEDIN JAPAN AU JAPON) LE0403 LED404 LED411 e I LED412 LE0405 FG5-3540 only LED406 1/ . A - 21
  • Canon PC770 | Service Manual - Page 190
    ,
  • Canon PC770 | Service Manual - Page 191
    0405_ 777 I I C402 R403 +24VR AEREF ps J401 N 0401 R409 • NA,A, FLEXP CY" J401 O O - C403 +24VR a. // N O cc C 4041 717 +24VR 4 J401 C401 5 J401 COPYRIGHT © 1994 CANON INC. CANON P072074017501770 REV.O AUG. 1994 PRINTED IN JAPAN (IMPRIME AU JAPON) A - 23
  • Canon PC770 | Service Manual - Page 192
    !APPENDIX H. SENSOR CIRCUIT DIAGRAM 075 0752 0753 RPD R751 CPO P752 CUP R753 +5V J751 APO GNU 6 J751 J751 DIG2 2 J751 CPO J751 DIG3 J751 COP J751 A - 24 COPYRIGHT © 1994 CANON INC. CANON PC720f74017501170 REY.0 AUG.1994 PRINTED IN JAPAN (IMPIIME AU JAPON)
  • Canon PC770 | Service Manual - Page 193
    I. NOISE FILTER CIRCUIT DIAGRAM APPENDIX= 8P501 ACJ-I FU501 N O II) CC 0 111 0 i0n 8P502 ACJJ C504 C503 H H,H I-- AC_1. 1 J501 FG 7/7 AC-2 2 J501 COPYRIGHT © 1994 CANON INC. CANON PC720/74017501770 REV.O AUG. 1994 PRINTEDIN JAPAN (MPRIMEAU JAPON) A - 25
  • Canon PC770 | Service Manual - Page 194
    JP714 PR BP701 R704 MA, SP BP702 R701 AA, DV BP703 TR 8P704 R702 (PR_IN BP705 (GND_INJp l BP706 8703 4-NAA/J [DV_IN)O BP707 A - 26 COPYRIGHT @ 1994 CANON INC. (IMPRIME CANON PC7201/4017501770 REVD AUG.1994 PRINTEDIN JAPAN AU JAPON)
  • Canon PC770 | Service Manual - Page 195
    APPENDIX NM K. BLANK EXPOSURE (front) CIRCUIT DIAGRAM LA6O1 2 J6O1 a J6O1 COPYRIGHT © 1994 CANON INC. CANON PC720/7401750M0 REV.0 AUG. 1994 PRINTEDIN JAPAN (IMPRIMEAU JAPON) A - 27
  • Canon PC770 | Service Manual - Page 196
    APPENDIX L. BLANK EXPOSURE (rear) CIRCUIT DIAGRAM LA602 2 J602 J602 A - 28 COPYRIGHT 1994 CANON INC. CANON PC72017401150/770 REV,0 AUG.1994 PRINTED IN JAPAN {I PRIME AU JAPON)
  • Canon PC770 | Service Manual - Page 197
    the standard tools set when servicing the machine. No. Tool Tool No. 1 Mirror positioning FY9-3009-020 tool (pair for front and rear) Shape ',.:,e> Rank* Remarks B For adjusting the distance between the No. 1 and No. 2 mirrors. COPYRIGHT O 1994 CANONINC. CANON
  • Canon PC770 | Service Manual - Page 198
    No. Name Uses Composition 1 Alcohol 2 Solvent Cleaning: e.g., glass, plastic, rubber parts; external covers Hydrocarbon (fluorine family) Alcohol Surface active agent Cleaning: e.g., metal; oil or toner dirt Hydrocarbon (fluorine/chlorine family) Alcohol 3 Lubricating oil Lubricating spring
  • Canon PC770 | Service Manual - Page 199
    Prepared by OFFICE IMAGING PRODUCTS TECHNICAL SUPPORT DEPARTMENT OFFICE IMAGING PRODUCTS TECHNICAL SUPPORT DIVISION CANON INC. Printed In Japan REVISION 0 (AUG 1994) (30359] 30-2, Shlmomaruko 3-chome, Ohta-ku, Tokyo 146 Japan
  • Canon PC770 | Service Manual - Page 200
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PET2C11T
MOTO
SERVICE
MANUAL
REVISION
0
AUG.
1994
4
CO
Canon
FY8-13DA-000
COPYRIGHT
©
104
CANON
INC,
CANON
PC774740750770
REV.°
AMIE%
PRINTED
1N
JAPAN
RA
PAIIAE
AU
JAPON)