Service Manual
Page 13
...Paper Source • The source of paper may be between 70% and 141% in -One Cartridge for Simple Maintenance • The photosensitive drum, toner case, charging roller, developing assembly, and cleaning assembly are constructed as he/she performs simple replacement/cleaning work immediately after power-on... the average, 0.02 ppm or less at maximum (1/100 to make jam removal easy. 8. COPYRIGHT © 1999 CANON INC. SURF Fixing Assembly • The wait time is possible with the use of a roller charging method has resulted in a considerable reduction...
...Paper Source • The source of paper may be between 70% and 141% in -One Cartridge for Simple Maintenance • The photosensitive drum, toner case, charging roller, developing assembly, and cleaning assembly are constructed as he/she performs simple replacement/cleaning work immediately after power-on... the average, 0.02 ppm or less at maximum (1/100 to make jam removal easy. 8. COPYRIGHT © 1999 CANON INC. SURF Fixing Assembly • The wait time is possible with the use of a roller charging method has resulted in a considerable reduction...
Service Manual
Page 14
Copier 1. Type Item Body Copyboard Source of light Lens Photosensitive medium 2. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) SPECIFICATIONS A. Mechanisms Item Reproduction Charging Exposure Copy density adjustment Development ...Original orientation Desk top Descriptions Fixed Halogen lamp (80 V/110 W for 120V-model; 150 V/160 W for 220/240 V-model) Fixed focal point lens OPC drum (24-mm dia.) Table 1-201 Descriptions Indirect static reproduction Roller (direct charging) Slit (moving light source) Auto or manual Dry (toner projection) Cassette (1 ...
Copier 1. Type Item Body Copyboard Source of light Lens Photosensitive medium 2. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) SPECIFICATIONS A. Mechanisms Item Reproduction Charging Exposure Copy density adjustment Development ...Original orientation Desk top Descriptions Fixed Halogen lamp (80 V/110 W for 120V-model; 150 V/160 W for 220/240 V-model) Fixed focal point lens OPC drum (24-mm dia.) Table 1-201 Descriptions Indirect static reproduction Roller (direct charging) Slit (moving light source) Auto or manual Dry (toner projection) Cassette (1 ...
Service Manual
Page 32
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 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. CHAPTER 1 GENERAL DESCRIPTION VI.
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 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. CHAPTER 1 GENERAL DESCRIPTION VI.
Service Manual
Page 33
... (negative DC) Step 5 Separation (curvature separation + static eliminator; positive DC) Step 6 Fixing Step 7 Drum cleaning Static latent image formation block 1. Image exposure 7. Primary charging 2. Fixing 4. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 1-21 Drum cleaning 3. Transfer Manual feed 5. CHAPTER 1 GENERAL DESCRIPTION The machine's image formation process consists of...
... (negative DC) Step 5 Separation (curvature separation + static eliminator; positive DC) Step 6 Fixing Step 7 Drum cleaning Static latent image formation block 1. Image exposure 7. Primary charging 2. Fixing 4. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 1-21 Drum cleaning 3. Transfer Manual feed 5. 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. Functional Construction The machine consists of four functional blocks...
... 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. Functional Construction The machine consists of four functional blocks...
Service Manual
Page 40
... reproduction ratio. • The forward speed varies according to the home position in Direct. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) Neutralizes the drum surface potential as the forward speed used in preparation for - Illuminates the original by the ...scanning lamp, and the reflected optical image is projected to when the Copy Start key is pressed. Table 2-101 2-4 COPYRIGHT © 1999 CANON INC. Description Waits...
... reproduction ratio. • The forward speed varies according to the home position in Direct. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) Neutralizes the drum surface potential as the forward speed used in preparation for - Illuminates the original by the ...scanning lamp, and the reflected optical image is projected to when the Copy Start key is pressed. Table 2-101 2-4 COPYRIGHT © 1999 CANON INC. Description Waits...
Service Manual
Page 41
...(M1) Hall IC output MMCLK Composite power supply PCB Reference signal Main motor drive PCB Figure 2-104 COPYRIGHT © 1999 CANON INC. Item Power supply Description 24 VDC from the DC controller PCB. Drive signal Signal (MMD) from the composite power ...shows the 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,...
...(M1) Hall IC output MMCLK Composite power supply PCB Reference signal Main motor drive PCB Figure 2-104 COPYRIGHT © 1999 CANON INC. Item Power supply Description 24 VDC from the DC controller PCB. Drive signal Signal (MMD) from the composite power ...shows the 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,...
Service Manual
Page 51
...Outline Table 3-101 shows the major functions of the scanning lamp to cut power to overheating of the exposure system. Figure 3-101 CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-1 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. Item Lamp Scanning Scanner position detection Ratio variation Lens drive control Scanner drive control Protective function Halogen ...
...Outline Table 3-101 shows the major functions of the scanning lamp to cut power to overheating of the exposure system. Figure 3-101 CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-1 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. Item Lamp Scanning Scanner position detection Ratio variation Lens drive control Scanner drive control Protective function Halogen ...
Service Manual
Page 52
... L1 < L3 Figure 3-102 3-2 COPYRIGHT © 1999 CANON INC. 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 scanning direction) is made higher (for ...reduction) or lower (for enlargement) than the drum peripheral speed. CHAPTER 3 EXPOSURE SYSTEM B. In the lens drive system, the positions of the No. 1 mirror mount is changed to vary the reproduction ratio. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON...
... L1 < L3 Figure 3-102 3-2 COPYRIGHT © 1999 CANON INC. 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 scanning direction) is made higher (for ...reduction) or lower (for enlargement) than the drum peripheral speed. CHAPTER 3 EXPOSURE SYSTEM B. In the lens drive system, the positions of the No. 1 mirror mount is changed to vary the reproduction ratio. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON...
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
... 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. The level of the DC bias is used to control the voltage applied to the primary charging roller, and has the following functions: ... Controlling the DC bias to a specific voltage • Controlling the AC bias to a specific voltage • Switching the level of the photosensitive drum will be uniform. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) Outline The circuit shown in Figure 4-103 is switched between when forming copy...
... 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. The level of the DC bias is used to control the voltage applied to the primary charging roller, and has the following functions: ... Controlling the DC bias to a specific voltage • Controlling the AC bias to a specific voltage • Switching the level of the photosensitive drum will be uniform. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) Outline The circuit shown in Figure 4-103 is switched between when forming copy...
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
... SCFW SCRV SCFW SCRV LSTR STBY Main motor (M1) Scanning lamp (LA1) Primary DC bias Primary AC bias -400V -625V Figure 4-104 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-7 CHAPTER 4 IMAGE FORMATION SYSTEM d. The microprocessor (Q900) on the composite power supply PCB...- copy image area (-400 V). Switching the DC Bias Level The machine switches the DC bias level between sheets) so as to prevent charging the photosensitive drum to a positive potential otherwise caused by the DC controller PCB.
... SCFW SCRV SCFW SCRV LSTR STBY Main motor (M1) Scanning lamp (LA1) Primary DC bias Primary AC bias -400V -625V Figure 4-104 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-7 CHAPTER 4 IMAGE FORMATION SYSTEM d. The microprocessor (Q900) on the composite power supply PCB...- copy image area (-400 V). Switching the DC Bias Level The machine switches the DC bias level between sheets) so as to prevent charging the photosensitive drum to a positive potential otherwise caused by the DC controller PCB.
Service Manual
Page 102
... 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 INC. CHAPTER 4 IMAGE FORMATION SYSTEM D. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
... 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 INC. CHAPTER 4 IMAGE FORMATION SYSTEM D. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Service Manual
Page 104
... a single rotation, the microprocessor (Q900) checks the transfer current detection signal four times, and determines the level of the period in the environment. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) CHAPTER 4 IMAGE FORMATION SYSTEM c. A current of a specific level (-14....6 µA) is pressed. Switching the Polarity of the readings. To remove excess toner, a positive voltage is applied to the drum: < Timing > • While initial rotation is executed after the Copy Start key is pressed • Part of the period in which last...
... a single rotation, the microprocessor (Q900) checks the transfer current detection signal four times, and determines the level of the period in the environment. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) CHAPTER 4 IMAGE FORMATION SYSTEM c. A current of a specific level (-14....6 µA) is pressed. Switching the Polarity of the readings. To remove excess toner, a positive voltage is applied to the drum: < Timing > • While initial rotation is executed after the Copy Start key is pressed • Part of the period in which last...
Service Manual
Page 105
... 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 are being made. Reference : Developing DC bias : -80 ~ -550V Developing AC bias : 1200Vpp ± 10% COPYRIGHT © 1999 CANON INC. CHAPTER 4 IMAGE FORMATION SYSTEM E. CANON...
... 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 are being made. Reference : Developing DC bias : -80 ~ -550V Developing AC bias : 1200Vpp ± 10% COPYRIGHT © 1999 CANON INC. CHAPTER 4 IMAGE FORMATION SYSTEM E. CANON...
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
... . Developing DC bias Voltage supplied to the setting used for normal copying when toner save mode, photo mode) • Setting of the photosensitive drum. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) CHAPTER 4 IMAGE FORMATION SYSTEM 4. The density correction switch (SW101) affects...images caused as a result of changes in the output of the AE sensor during manual density adjustment. 4-14 COPYRIGHT © 1999 CANON INC. Controlling the Voltage Level of the Developing DC Bias The DC bias control signal (BIAS_PWM) is varied according to the following settings...
... . Developing DC bias Voltage supplied to the setting used for normal copying when toner save mode, photo mode) • Setting of the photosensitive drum. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) CHAPTER 4 IMAGE FORMATION SYSTEM 4. The density correction switch (SW101) affects...images caused as a result of changes in the output of the AE sensor during manual density adjustment. 4-14 COPYRIGHT © 1999 CANON INC. Controlling the Voltage Level of the Developing DC Bias The DC bias control signal (BIAS_PWM) is varied according to the following settings...
Service Manual
Page 110
...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 CANON INC. The AE mechanism enables production of copies free of fogging as long as the...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.
...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 CANON INC. The AE mechanism enables production of copies free of fogging as long as the...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.
Service Manual
Page 115
... plate Lens shift 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 Reduce mode Figure 4-122 COPYRIGHT © 1999 CANON INC. Outline The machine is moved in relation to prevent adhesion of the side blanking...
... plate Lens shift 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 Reduce mode Figure 4-122 COPYRIGHT © 1999 CANON INC. Outline The machine is moved in relation to prevent adhesion of the side blanking...