Service Manual
Page 13
CHAPTER 1 GENERAL DESCRIPTION I. All-in-One Cartridge for Simple Maintenance • The photosensitive drum, toner case, charging roller, developing assembly, and cleaning assembly are constructed as a business card. 5. ADF Type • Continuous copying is 0 sec... images at maximum (1/100 to make jam removal easy. 8. FEATURES 1. The user may be opened to 1/1000 compared with existing Canon machines). 3. COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 1-1 multifeeder type). 7. Personal Copier with the use of paper...
CHAPTER 1 GENERAL DESCRIPTION I. All-in-One Cartridge for Simple Maintenance • The photosensitive drum, toner case, charging roller, developing assembly, and cleaning assembly are constructed as a business card. 5. ADF Type • Continuous copying is 0 sec... images at maximum (1/100 to make jam removal easy. 8. FEATURES 1. The user may be opened to 1/1000 compared with existing Canon machines). 3. COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 1-1 multifeeder type). 7. Personal Copier with the use of paper...
Service Manual
Page 14
...Descriptions Fixed Halogen lamp (80 V/110 W for 120V-model; 150 V/160 W for 220/240 V-model) Fixed focal point lens OPC drum (24-mm dia.) Table 1-201 Descriptions Indirect static reproduction Roller (direct charging) Slit (moving light source) Auto or manual Dry (... type) Multifeeder (multifeeder type) Curvature separation + static eliminator Flat heater Blade Center reference (copyboard) Table 1-202 1-2 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) Type Item Body Copyboard Source of light Lens Photosensitive medium 2. Copier...
...Descriptions Fixed Halogen lamp (80 V/110 W for 120V-model; 150 V/160 W for 220/240 V-model) Fixed focal point lens OPC drum (24-mm dia.) Table 1-201 Descriptions Indirect static reproduction Roller (direct charging) Slit (moving light source) Auto or manual Dry (... type) Multifeeder (multifeeder type) Curvature separation + static eliminator Flat heater Blade Center reference (copyboard) Table 1-202 1-2 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) Type Item Body Copyboard Source of light Lens Photosensitive medium 2. Copier...
Service Manual
Page 32
IMAGE FORMATION A. Outline The construction of the machine is as follows: Scanning lamp Copyboard glass Fixed focal point lens Side blanking lamp (front, rear) Primary charging roller Developing blade Fixing assembly Cleaning blade Developing cylinder Photosensitive drum Figure 1-601 Transfer charging roller Static eliminator 1-20 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) CHAPTER 1 GENERAL DESCRIPTION VI.
IMAGE FORMATION A. Outline The construction of the machine is as follows: Scanning lamp Copyboard glass Fixed focal point lens Side blanking lamp (front, rear) Primary charging roller Developing blade Fixing assembly Cleaning blade Developing cylinder Photosensitive drum Figure 1-601 Transfer charging roller Static eliminator 1-20 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) CHAPTER 1 GENERAL DESCRIPTION VI.
Service Manual
Page 33
... + negative DC) Step 4 Transfer (negative DC) Step 5 Separation (curvature separation + static eliminator; Primary charging 2. Development Delivery 6. Fixing 4. positive DC) Step 6 Fixing Step 7 Drum cleaning Static latent image formation block 1. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 1-21 CHAPTER 1 GENERAL DESCRIPTION The machine's image formation process consists of...
... + negative DC) Step 4 Transfer (negative DC) Step 5 Separation (curvature separation + static eliminator; Primary charging 2. Development Delivery 6. Fixing 4. positive DC) Step 6 Fixing Step 7 Drum cleaning Static latent image formation block 1. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 1-21 CHAPTER 1 GENERAL DESCRIPTION The machine's image formation process consists of...
Service Manual
Page 37
... Original illuminating block Optical block Primary charging roller 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. BASIC OPERATIONS A. Functional Construction The machine consists of four...
... Original illuminating block Optical block Primary charging roller 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. BASIC OPERATIONS A. Functional Construction The machine consists of four...
Service Manual
Page 40
...and reproduction ratio. • The forward speed varies according to when the scanner moves for the next copying run. Neutralizes the drum surface potential as the forward speed used in reverse. • The reverse speed is about Measures the density of the original... key is Removes residual charges from the pressed to the selected reproduction ratio. Table 2-101 2-4 COPYRIGHT © 1999 CANON INC. From when SCRV ends to the photosensitive drum through mirrors and lenses. CHAPTER 2 BASIC OPERATION STBY (standby) INTR (initial rotation) AER (AE rotation) SCFW (...
...and reproduction ratio. • The forward speed varies according to when the scanner moves for the next copying run. Neutralizes the drum surface potential as the forward speed used in reverse. • The reverse speed is about Measures the density of the original... key is Removes residual charges from the pressed to the selected reproduction ratio. Table 2-101 2-4 COPYRIGHT © 1999 CANON INC. From when SCRV ends to the photosensitive drum through mirrors and lenses. CHAPTER 2 BASIC OPERATION STBY (standby) INTR (initial rotation) AER (AE rotation) SCFW (...
Service Manual
Page 41
... functions of the main motor control circuit, and Figure 2-104 is a block diagram of the circuit. Moving/drive parts Photosensitive drum, primary charging roller, developing assembly, transfer charging roller, pickup roller, vertical roller, registration roller, feeding assembly, fixing assembly, delivery... roller, heat exhaust fan Control Executes on/off control. Drive signal Signal (MMD) from the composite power supply. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 2-5 CHAPTER 2 BASIC OPERATION D. Item Power supply Description 24...
... functions of the main motor control circuit, and Figure 2-104 is a block diagram of the circuit. Moving/drive parts Photosensitive drum, primary charging roller, developing assembly, transfer charging roller, pickup roller, vertical roller, registration roller, feeding assembly, fixing assembly, delivery... roller, heat exhaust fan Control Executes on/off control. Drive signal Signal (MMD) from the composite power supply. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 2-5 CHAPTER 2 BASIC OPERATION D. Item Power supply Description 24...
Service Manual
Page 51
...; 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. CHAPTER 3 EXPOSURE SYSTEM I. OPERATIONS A. Figure 3-101 CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-1 Item Lamp Scanning Scanner position detection Ratio...
...; 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. CHAPTER 3 EXPOSURE SYSTEM I. OPERATIONS A. Figure 3-101 CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-1 Item Lamp Scanning Scanner position detection Ratio...
Service Manual
Page 52
...length: L1 < L2, L1 < L3 Figure 3-102 3-2 COPYRIGHT © 1999 CANON INC. Varying the Reproduction Ratio The reproduction ratio in the drum axial direction (main scanning direction) is varied by the scanner drive system. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) In the scanner... system, the relative speed of the fixed focal point lens and the No. 4/5 mirror are changed by the lens drive system, and that in the drum peripheral direction (sub...
...length: L1 < L2, L1 < L3 Figure 3-102 3-2 COPYRIGHT © 1999 CANON INC. Varying the Reproduction Ratio The reproduction ratio in the drum axial direction (main scanning direction) is varied by the scanner drive system. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) In the scanner... system, the relative speed of the fixed focal point lens and the No. 4/5 mirror are changed by the lens drive system, and that in the drum peripheral direction (sub...
Service Manual
Page 96
CHAPTER 4 IMAGE FORMATION SYSTEM Copyboard glass Scanning lamp AE sensor Side blanking lamp Lens Primary charging roller Developing cylinder Photosensitive drum Drum cartridge Static eliminator Transfer roller Q101 Microprocessor DC controller PCB Lamp regulator block High-voltage 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 AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM Copyboard glass Scanning lamp AE sensor Side blanking lamp Lens Primary charging roller Developing cylinder Photosensitive drum Drum cartridge Static eliminator Transfer roller Q101 Microprocessor DC controller PCB Lamp regulator block High-voltage 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 AU JAPON)
Service Manual
Page 98
CHAPTER 4 IMAGE FORMATION SYSTEM C. The level of the photosensitive drum will be uniform. Outline The circuit shown in Figure 4-103 is switched between when forming copy images and when not forming copy images. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) Reference: DC component: AC component: -400 V (non-image... DC bias Both DC bias and AC bias are applied to the primary charging roller so as to 3000 Vpp (885µA) 4-4 COPYRIGHT © 1999 CANON INC. Controlling the Primary Charging Roller Bias 1.
CHAPTER 4 IMAGE FORMATION SYSTEM C. The level of the photosensitive drum will be uniform. Outline The circuit shown in Figure 4-103 is switched between when forming copy images and when not forming copy images. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) Reference: DC component: AC component: -400 V (non-image... DC bias Both DC bias and AC bias are applied to the primary charging roller so as to 3000 Vpp (885µA) 4-4 COPYRIGHT © 1999 CANON INC. Controlling the Primary Charging Roller Bias 1.
Service Manual
Page 99
Main transformer T101 CHAPTER 4 IMAGE FORMATION SYSTEM Voltage separation circuit T508 High-voltage transformer for primary charging Primary charging roller Photosensitive drum Amplifier DC bias control signal PDC_PWM DC voltage monitor signal PDC_S AC component current monitor signal PAC_S AC bias output signal PAC_OUT -5 PR_DC_ON J103 J203 -4 Microprocessor (Q900) Composite power supply PCB Serial communication Microprocessor (Q101) Figure 4-103 DC controller PCB COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-5
Main transformer T101 CHAPTER 4 IMAGE FORMATION SYSTEM Voltage separation circuit T508 High-voltage transformer for primary charging Primary charging roller Photosensitive drum Amplifier DC bias control signal PDC_PWM DC voltage monitor signal PDC_S AC component current monitor signal PAC_S AC bias output signal PAC_OUT -5 PR_DC_ON J103 J203 -4 Microprocessor (Q900) Composite power supply PCB Serial communication Microprocessor (Q101) Figure 4-103 DC controller PCB COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-5
Service Manual
Page 101
...See Table 4-102.) Reference: The machine applies a DC bias over a non-copy image area (between the copy image area (-625 V) and the non- CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-7 CHAPTER 4 IMAGE FORMATION SYSTEM d. Switching the DC Bias Level The machine switches ...the DC bias level between sheets) so as to prevent charging the photosensitive drum to switch the level of the DC bias is switched by the DC bias ON signal (serial signal) generated by the cleaning bias from...
...See Table 4-102.) Reference: The machine applies a DC bias over a non-copy image area (between the copy image area (-625 V) and the non- CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-7 CHAPTER 4 IMAGE FORMATION SYSTEM d. Switching the DC Bias Level The machine switches ...the DC bias level between sheets) so as to prevent charging the photosensitive drum to switch the level of the DC bias is switched by the DC bias ON signal (serial signal) generated by the cleaning bias from...
Service Manual
Page 102
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) Controlling the Transfer Roller Bias 1. CHAPTER 4 IMAGE FORMATION SYSTEM D. Outline The circuit shown in ... signal T_FW_DRV Transfer bias control circuit Transfer DC bias ON signal T_FW_ON High-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 PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) Controlling the Transfer Roller Bias 1. CHAPTER 4 IMAGE FORMATION SYSTEM D. Outline The circuit shown in ... signal T_FW_DRV Transfer bias control circuit Transfer DC bias ON signal T_FW_ON High-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...
Service Manual
Page 104
... a single rotation, the microprocessor (Q900) checks the transfer current detection signal four times, and determines the level of the transfer bias to the drum: < Timing > • While initial rotation is executed after the Copy Start key is pressed • Part of the period in which the... unattended. Switching the Polarity of the readings. d. A current of the transfer bias to go '0', so that it will be an appropriate level. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) In response to the signal, the microprocessor (Q900) on the composite power ...
... a single rotation, the microprocessor (Q900) checks the transfer current detection signal four times, and determines the level of the transfer bias to the drum: < Timing > • While initial rotation is executed after the Copy Start key is pressed • Part of the period in which the... unattended. Switching the Polarity of the readings. d. A current of the transfer bias to go '0', so that it will be an appropriate level. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) In response to the signal, the microprocessor (Q900) on the composite power ...
Service Manual
Page 105
Controlling the Developing/Separation Static Eliminator Bias 1. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-11 CHAPTER 4 IMAGE FORMATION SYSTEM E. Outline The circuit shown in Figure 4-107 is applied ... off the static eliminator bias) • Controlling the voltage level of excess toner on and off the AC bias (turning on the photosensitive drum. When the photosensitive drum rotates and yet developing is not under way, about -500 VDC is used to control the voltage applied to the developing cylinder while copies...
Controlling the Developing/Separation Static Eliminator Bias 1. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-11 CHAPTER 4 IMAGE FORMATION SYSTEM E. Outline The circuit shown in Figure 4-107 is applied ... off the static eliminator bias) • Controlling the voltage level of excess toner on and off the AC bias (turning on the photosensitive drum. When the photosensitive drum rotates and yet developing is not under way, about -500 VDC is used to control the voltage applied to the developing cylinder while copies...
Service Manual
Page 106
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) CHAPTER 4 IMAGE FORMATION SYSTEM Main transformer T101 High-voltage transformer for developing/static eliminator Developing DC bias detection circuit +5V T201 Static eliminator bias generation circuit + Photo sensitive drum Developing cylinder Static eliminator DC bias control signal BIAS_PWM DC bias monitor... density setting signal Copy density correction signal AE sensor PCB Control panel Density correction switch (SW101) DC controller PCB Figure 4-107 4-12 COPYRIGHT © 1999 CANON INC.
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) CHAPTER 4 IMAGE FORMATION SYSTEM Main transformer T101 High-voltage transformer for developing/static eliminator Developing DC bias detection circuit +5V T201 Static eliminator bias generation circuit + Photo sensitive drum Developing cylinder Static eliminator DC bias control signal BIAS_PWM DC bias monitor... 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.
Service Manual
Page 108
... in the sensitivity of the density correction switch (SW101) The density correction switch (SW101) mounted on the DC controller PCB may be set . CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) The density correction switch (SW101) affects both manual density adjustment and auto ...Output of the AE sensor (in automatic control mode) • Setting of the AE sensor during manual density adjustment. 4-14 COPYRIGHT © 1999 CANON INC. The machine corrects the level of the developing DC bias and the voltage supplied to the scanning lamp as to the setting used for...
... in the sensitivity of the density correction switch (SW101) The density correction switch (SW101) mounted on the DC controller PCB may be set . CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) The density correction switch (SW101) affects both manual density adjustment and auto ...Output of the AE sensor (in automatic control mode) • Setting of the AE sensor during manual density adjustment. 4-14 COPYRIGHT © 1999 CANON INC. The machine corrects the level of the developing DC bias and the voltage supplied to the scanning lamp as to the setting used for...
Service Manual
Page 110
...or less uniform in density by varying the DC component of the developing bias according to control the DC component of the developing bias. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) Measuring the Density of the original. Scanning lamp +24V +... +24V + AE sensor J601 J107 -3 -2 AEREF +5V -2 -3 AE +24V + VR103 +5V +24V + VR102 (Q101) Developing cylinder Photosensitive drum Microprocessor Microprocessor (Q900) Developing DCON signal Serial communication DC controller PCB Figure 4-113 Composite power supply PCB 4-16 COPYRIGHT © 1999...
...or less uniform in density by varying the DC component of the developing bias according to control the DC component of the developing bias. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) Measuring the Density of the original. Scanning lamp +24V +... +24V + AE sensor J601 J107 -3 -2 AEREF +5V -2 -3 AE +24V + VR103 +5V +24V + VR102 (Q101) Developing cylinder Photosensitive drum Microprocessor Microprocessor (Q900) Developing DCON signal Serial communication DC controller PCB Figure 4-113 Composite power supply PCB 4-16 COPYRIGHT © 1999...
Service Manual
Page 115
...detecting shaft Front side blanking lamp (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 in Direct and Reduce mode B: Position of excess toner when making reduced copies. 2. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-21 Operations... detected by the lens shift detecting shaft. CHAPTER 4 IMAGE FORMATION SYSTEM G. Outline The machine is moved in Reduce mode Figure 4-122 COPYRIGHT © 1999 CANON INC. Controlling the Side Blanking Mechanism 1.
...detecting shaft Front side blanking lamp (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 in Direct and Reduce mode B: Position of excess toner when making reduced copies. 2. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-21 Operations... detected by the lens shift detecting shaft. CHAPTER 4 IMAGE FORMATION SYSTEM G. Outline The machine is moved in Reduce mode Figure 4-122 COPYRIGHT © 1999 CANON INC. Controlling the Side Blanking Mechanism 1.