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SERVICE MANUAL
REVISION 0
JAN.1998
COPYRIGHT © 1998 CANON INC.
FY8-13F2-000
CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
IMPORTANT
THIS DOCUMENTATION IS PUBLISHED BY CANON INC., JAPAN, TO SERVE AS A SOURCE OF REFERENCE FOR WORK IN THE FIELD. SPECIFICATIONS AND OTHER INFORMATION CONTAINED HEREIN MAY VARY SLIGHTLY FROM ACTUAL MACHINE VALUES OR THOSE FOUND IN ADVERTISING AND OTHER PRINTED MATTER. ANY QUESTIONS REGARDING INFORMATION CONTAINED HEREIN SHOULD BE DIRECTED TO THE COPIER SERVICE DEPARTMENT OF THE SALES COMPANY. THIS DOCUMENTATION IS INTENDED FOR ALL SALES AREAS, AND MAY CONTAIN INFORMATION NOT APPLICABLE TO CERTAIN AREAS.
COPYRIGHT © 1998 CANON INC. Printed in Japan Imprimé au Japon
Use of this manual should be strictly supervised to avoid disclosure of confidential information.
Prepared by OFFICE IMAGING PRODUCTS TECHNICAL SUPPORT DEPARTMENT 1 OFFICE IMAGING PRODUCTS TECHNICAL SUPPORT DIVISION
CANON INC. 5-1, Hakusan 7-chome, Toride-shi, Ibaraki 302 Japan
COPYRIGHT © 1998 CANON INC.
CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
INTRODUCTION
This Service Manual provides information needed to service the plain paper copiers FC200/PC400(120V model), FC220/PC420(120V model), and PC430(LGL model) in the field. The FC200/PC400 differs from the FC220/PC420/PC430 for the following:
Model Manual pick-up Multifeeder Available Not available AE Available Not available
FC220/PC420/PC430 Not available FC200/PC400 Available
This Service Manual consists of the following chapters: CHAPTER 1, "General Description," introduces the copier's features and specifications, shows how to operate the copier, and explains how copies are made. CHAPTER 2, "Basic Operation," provides outlines of the copier's various mechanical workings. CHAPTER 3, "Exposure System," discusses the principles of operation used for the copier's lens drive unit and scanner drive unit. It also explains the timing at which these drive units are operated, and shows how they may be disassembled/assembled and adjusted. CHAPTER 4, "Image Formation System," discusses the principles of how images are formed. It also explains the timing at which the various units involved in image formation are operated, and shows how they may be disassembled/assembled and adjusted. CHAPTER 5, "Pick-Up/Feeding System," explains the principles used from when copy paper is picked up to when a copy is delivered in view of the functions of electrical and mechanical units and in relation to their timing of operation. It also shows how these units may be disassembled/assembled and adjusted. CHAPTER 6, "Fixing System," explains the principles used to fuse toner images to transfer media in view of the functions of electrical and mechanical units and in relation to their timing of operation. It also shows how these units may be disassembled/assembled and adjusted. CHAPTER 7, "Externals/Auxiliary Mechanisms," shows the copier's external parts, and explains the principles used for the copier's various control mechanisms in view of the functions of electrical and mechanical units and in relation to their timing of operation. It also shows how these units may be disassembled/assembled and adjusted. CHAPTER 8, "Installation," introduces requirements for the site of installation, and shows how the copier may be installed using step-by-step instructions. CHAPTER 9, "Maintenance and Servicing," provides tables of periodically replaced parts and consumables/durables and scheduled servicing charts. CHAPTER 10, "Troubleshooting," provides tables of maintenance/inspection, standards/adjustments, and problem identification (image fault/malfunction). Appendix contains a general timing chart and general circuit diagrams.
COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
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The following rules apply throughout this Service Manual: 1. Each chapter contains sections explaining the purpose of specific functions and the relationship between electrical and mechanical systems with reference to the timing of operation. In the diagrams, represents the path of mechanical drive where a signal name accompanies the symbol , the arrow indicates the direction of the electric signal. The expression "turn on the power" means flipping on the power switch, closing the front door, and closing the delivery unit door, which results in supplying the machine with power. 2. In the digital circuits, '1' is used to indicate that the voltage level of a given signal is "High," while '0' is used to indicate "Low." (The voltage value, however, differs from circuit to circuit.) In practically all cases, the internal mechanisms of a microprocessor cannot be checked in the field. Therefore, the operations of the microprocessors used in the machines are not discussed: they are explained in terms of from sensors to the input of the DC controller PCB and from the output of the DC controller PCB to the loads. Note: The descriptions in this Service Manual are subject to change without notice for product improvement or other purposes, and major changes will be communicated in the form of Service Information bulletins. All service persons are expected to have a good understanding of the contents of this Service Manual and all relevant Service Information bulletins and be able to identify and isolate faults in the machine.
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COPYRIGHT © 1998 CANON INC.
CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CONTENTS
CHAPTER 1 GENERAL DESCRIPTION
I. FEATURES ..................................1-1 II. SPECIFICATIONS .......................1-2 III. NAMES OF PARTS .....................1-4 A. External View ..........................1-4 B. Cross Section .........................1-5 IV. OPERATION ................................1-6 A. Control Panel ..........................1-6 1. PC420/430/FC220 .............1-6 2. PC400/FC200 ....................1-7 B. Making Copies ........................1-8 C. Jam Indicator.........................1-11 D. Add Paper Indicator ..............1-11 E. Replacing the Cartridge ........1-11 Time to Replace the Cartridge .........................................1-11 2. Replacing the Cartridge ...1-12 F. Changing the Density ...........1-14 G. Cleaning................................1-14 1. Copyboard Glass/Copyboard Cover ...............................1-14 2. Lens Array .......................1-15 3. Pick-Up Roller..................1-16 H. When Not Using the Copier for a Long Time .............................1-16 V. IMAGE FORMATION .................1-17 A. Outline.....................................1-17 1.
CHAPTER 2 BASIC OPERATION
I. BASIC OPERATION ....................2-1 A. Outline ....................................2-1 B. Outline of Electrical Circuit......2-2 C. Basic Sequence of Operations (A4, 2 copies)..........................2-3 D. Main Motor Control Circuit ......2-5 1. Outline ...............................2-5 2. Operation ...........................2-5 3. Overcurrent Sensor ...........2-5 E. Inputs to DC Controller ...........2-6 Inputs to DC Controller (1/2) ...........................................2-6 2. Inputs to DC Controller (2/2) ...........................................2-7 F. Outputs from DC Controller ....2-8 1. Outputs from DC Controller (1/2) ...................................2-8 2. Outputs from DC Controller (2/2) ...................................2-9 1.
CHAPTER 3 EXPOSURE SYSTEM
I. EXPOSURE/COPYBOARD DRIVE SYSTEM ......................................3-1 A. Outline of Exposure System ...3-1 B. Copyboard Drive System........3-1 1. Outline ...............................3-1 2. Controlling the Copyboard Drive ..................................3-3 3. Mechanism of Copyboard Drive Assembly..................3-4 II. Controlling the Scanning Lamp....3-7 A. Outline ....................................3-7 B. Operations ..............................3-8 1. Turning the Scanning Lamp
COPYRIGHT © 1998 CANON INC.
ON and OFF ......................3-8 2. Controlling the Intensity of the Scanning Lamp..................3-8 C. Controlling the Intensity of the Scanning Lamp (VR604) ........3-8 III. MECHANICAL SYSTEM..............3-9 A. Scanning System..................3-10 1. Detaching the Scanning Lamp Unit ..................................3-10 B. Copyboard Drive Assembly...3-11 1. Detaching the Copyboard Drive Assembly ................3-11 iii
CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
I. PROCESS DESCRIPTION..........4-1 A. Outline ....................................4-1 B. Sequence of Image Formation Operations (A4, 2 copies) .......4-2 C. Primary Charging Control Circuit ................................................4-3 1. Outline ...............................4-3 2. Operations .........................4-4 D. Controlling Developing Bias....4-6 1. Outline ...............................4-6 2. Operations .........................4-8 E. Transfer Charging Control Circuit ..............................................4-10 1. Outline .............................4-10 2. Operations .......................4-11 F. Document Density Measurement (AE; PC420/430/FC220).......4-14 Outline .............................4-14 Operations .......................4-14 Adjusting the AE Mechanism (VR602, VR603) ..............4-15 II. CHARGING, DEVELOPING, AND CLEANING SYSTEMS ..............4-17 A. Cartridge ...............................4-17 1. Outline .............................4-17 III. MECHANICAL SYSTEM............4-18 A. Photosensitive Drum.............4-19 1. Cleaning the Drum...........4-19 B. Transfer Charging Roller.......4-20 1. Cleaning the Transfer Charging Roller................4-20 2. Detaching the Transfer Charging Roller................4-20 1. 2. 3.
CHAPTER 5 PICK-UP/FEEDING SYSTEM
I. II. OUTLINE .....................................5-1 CONTROLLING THE PICK-UP ROLLER.......................................5-2 A. PC420/430/FC220 ..................5-2 B. PC400/FC200 .........................5-3 III. CONTROLLING THE REGISTRATION ROLLER...........5-4 A. Outline ....................................5-4 B. Pick-Up/Feeding Timing Chart (A4, 2 copies)..........................5-5 IV. CHECKING FOR JAMS...............5-6 A. Delivery Delay Jam .................5-6 1. PC420/430/FC220 .............5-6 2. PC400/FC200 ....................5-6 B. Delivery Stationary Jam..........5-7 1. PC420/430/FC220 .............5-7 2. PC400/FC200 ....................5-7 C. Pick-Up Delay Jam (PC420/430/FC220)................5-8 D. Pick-Up Stationary Jam ..........5-9 1. PC420/430/FC220 .............5-9 2. PC400/FC200 ....................5-9 E. Paper is present at the pick-up or delivery sensor at time of poweron or when the Copy Start key is pressed. ..................................5-9 V. MECHANICAL SYSTEM............5-10 A. Pick-Up Roller Assembly.......5-11 1. Detaching the Pick-Up Roller .........................................5-11 B. Registration Roller Assembly ..............................................5-14 1. Detaching the Registration Roller Assembly...............5-14 C. Removing the Separation Pad ..............................................5-15
CHAPTER 6 FIXING SYSTEM
I. OUTLINE OF OPERATIONS .......6-1 A. Outline ....................................6-1 B. Controlling the Fixing Heater Temperature............................6-3
COPYRIGHT © 1998 CANON INC.
C. Controlling the Supply Power to the Fixing Heater ....................6-3 D. Protection Mechanisms ..........6-5 II. MECHANICAL SYSTEM..............6-6 A. Fixing Assembly......................6-7
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
1. 2.
Construction.......................6-7 Detaching the Fixing Assembly ...........................6-7
3. 4.
Removing the Fixing Upper Unit ....................................6-9 Detaching the Pressure Roller .........................................6-11
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS
POWER SUPPLY ........................7-1 A. Outline ....................................7-1 B. Power Supply PCB .................7-2 C. Protection Mechanism for Power Supply Circuit..........................7-2 II.MECHANICAL SYSTEM .................7-3 A. External Covers ......................7-4 1. Detaching the Control Panel Cover .................................7-4 2. Detaching the Body Cover ...........................................7-5 3. Detaching the Top Cover Assembly ...........................7-7 4. Detaching the Delivery Assembly Cover.................7-7 I. Detaching the Bottom Cover ...........................................7-8 B. Copyboard Assembly..............7-9 1. Detaching the Copyboard Cover .................................7-9 2. Detaching the Copyboard ..7-9 C. DC Controller/DC Power Supply PCB.......................................7-11 1. Detaching the DC Controller/DC Power Supply PCB..................................7-11 2. Points to Note When Installing the Delivery Door Switch .7-13 D. Control Panel PCB................7-14 1. Detaching the Control Panel PCB .................................7-14 5.
CHAPTER 8 INSTALLATION
I. II. SELECTING THE SITE ...............8-1 UNPACKING AND INSTALLATION .....................................................8-2 III. RELOCATING THE MACHINE ....8-5
CHAPTER 9 MAINTENANCE AND SERVICING
I. PERIODICALLY REPLACED PARTS .....................................................9-1 II. DURABLES..................................9-1 III. PERIODICAL SERVICING ..........9-1 IV. NOTES ABOUT CARTRIDGE .....9-2 A. Storing Sealed Cartridges.......9-2 B. Storing and Handling Unsealed Cartridges ...............................9-3 1. Storing Unsealed Cartridges ...........................................9-3 2. Handling the Cartridge.......9-3
CHAPTER 10 TROUBLESHOOTING
I. MAINTENANCE AND INSPECTION ...................................................10-3 A. Image Adjustment Basic Procedure .............................10-3 B. Points to Note .......................10-4 II. STANDARDS AND
COPYRIGHT © 1998 CANON INC.
ADJUSTMENTS ........................10-5 A. Mechanical............................10-5 1. Image Leading Edge NonImage Width (position of white paint on back of glass).....10-5 2. Image Leading Edge Margin v CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
(cross feed direction). ....10-20 (point of detection for 13. The back of the copy is soiled. registration)......................10-5 .......................................10-20 B. Electrical ...............................10-6 14. The copy has faulty fixing. 1. Adjusting the Intensity .......................................10-21 (VR604) ...........................10-6 15. The copy has faulty leading 2. Adjusting the AE Mechanism edge registration (blank area (VR602, VR603) ..............10-8 much too wide). .............10-21 III. IMAGE TROUBLESHOOTING 10-11 16. The copy has faulty leading A. Making Initial Checks ..........10-11 edge registration (blank area 1. Site Environment............10-11 too wide). .......................10-21 2. Checking the Documents 17. The copy has faulty leading .......................................10-11 edge registration (no blank 3. Checking the Copyboard area). .............................10-21 Cover and Copyboard Glass 18. The copy has a blurred image. for Dirt and Scratches ....10-12 .......................................10-22 4. Checking the Lens Array for 19. The copy is foggy (cross feed Dirt .................................10-12 direction). .......................10-22 5. Checking the Transfer 20. The copy has poor sharpness Charging Roller..............10-12 (focus)............................10-22 6. Checking the Feeding 21. The copy is blank...........10-23 Assembly .......................10-12 22. The copy is solid black...10-23 7. Checking the Copy Paper IV. TROUBLESHOOTING .......................................10-12 MALFUNCTIONS.....................10-24 8. Checking the Durables ..10-12 A. Troubleshooting Malfunctions 9. Others ............................10-14 ............................................10-24 B. Samples of Image Faults ....10-16 1. (self diagnosis; C. Troubleshooting by Image Fault PC400/FC200)...............10-24 ............................................10-17 2. E0 ..................................10-24 1. The copy is too light (halftone 3. E2 ..................................10-25 areas only). ....................10-17 4. E6 ..................................10-25 2. The copy is too light (dark 5. E9 ..................................10-26 areas as well).................10-17 6. AC power is absent........10-26 3. The copy is too light 7. Pick-up fails. ..................10-27 (extremely light overall)..10-17 8. The scanning lamp fails to go 4. The copy has uneven density ON. ................................10-27 (darker at front). .............10-18 9. The main motor fails to rotate. 5. The copy has uneven density .......................................10-28 (lighter at front). .............10-18 10. The copyboard fails to move. 6. The copy is foggy (overall). .......................................10-28 .......................................10-18 11. (paper feeding normally) 7. The copy is foggy (paper feed direction). .......................10-19 .......................................10-29 8. The copy has dark lines 12. (at time of jam) ..........10-29 (paper feed direction, 13. The fixing heater fails to relatively narrow). ..........10-19 operate...........................10-29 9. The copy has dark lines V. TROUBLESHOOTING PAPER (paper feed direction, thin). FEED PROBLEMS ..................10-30 .......................................10-19 A. Copy Paper Jams ...............10-30 10. The copy has white spots 1. Pick-Up Assembly..........10-31 (paper feed direction).....10-19 2. Separation/Feeding Assembly 11. The copy has white lines .......................................10-31 (paper feed direction).....10-19 3. Fixing/Delivery Assembly 12. The copy has white spots .......................................10-32 vi COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
B. Feeding Faults ....................10-33 1. Double Feeding .............10-33 2. Wrinkles .........................10-33 VI. FUNCTIONS AND ARRANGEMENT OF ELECTRICAL PARTS ........10-34 A. Sensors and Solenoids.......10-34 B. Switches .............................10-35 C. Lamp, Heater, Motor, and Others
............................................10-36 D. Printed Circuit Board (PCB)10-37 E. Variable Resistors (VR) and Check Pins by PCB ............10-38 1. DC Controller/DC Power Supply PCB ...................10-38 2. Control Panel PCB.........10-39 VII. SELF DIAGNOSIS ...................10-40
APPENDIX
A. GENERAL TIMING CHART .........A-1 B. SIGNALS/ABBREVIATIONS LISTA-3 1. Signals....................................A-3 2. Abbreviations..........................A-4 C. GENERAL CIRCUIT DIAGRAM...A-5 D. SPECIAL TOOLS TABLE .............A-7 E. SOLVENTS/OILS TABLE .............A-8
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
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COPYRIGHT © 1998 CANON INC.
CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 1 GENERAL DESCRIPTION
This chapter outlines the machine's specifications and how it may be operated.
I. FEATURES ..................................1-1 II. SPECIFICATIONS .......................1-2 III. NAMES OF PARTS .....................1-4 A. External View ..........................1-4 B. Cross Section .........................1-5 IV. OPERATION ................................1-6 A. Control Panel ..........................1-6 B. Making Copies ........................1-8 C. Jam Indicator.........................1-11
COPYRIGHT © 1998 CANON INC.
Add Paper Indicator ..............1-11 Replacing the Cartridge ........1-11 Changing the Density ...........1-14 Cleaning................................1-14 When Not Using the Copier for a Long Time .............................1-16 V. IMAGE FORMATION .................1-17 A. Outline.....................................1-17 1
D. E. F. G. H.
CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 1 GENERAL DESCRIPTION
Blank Page
COPYRIGHT © 1998 CANON INC.
CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 1 GENERAL DESCRIPTION
I. FEATURES
1. Direct charging. The charging roller directly charges paper, significantly reducing ozone emission. 2. Auto power-off. The copier shuts off automatically when left alone for about 5 minutes after the last copy operation. 3. Quick start. The copier's wait time is 0 second, always ready for quick copying work. 4. Cartridge type. The core of the copier (photosensitive drum, toner case, charging roller, developing assembly, and cleaning assembly) is integrated into a single cartridge. The user need no more than replace the cartridge and perform simple cleaning to maintain the copier in top condition. 5. Variety of copy effects. In addition to black toner, the user has a choice of several colors. Taking advantage of overlay copying, various copy effects may be obtained through mere replacement of the cartridge. 6. Compact and light. The copier is compact and light, providing good portability. It can easily substitute as a personal copier. 7. Multifeeding (PC420/430/FC220). A stack of copy paper may be placed on the pick-up tray. A press on the Copy Start key is all it takes to generate multiple copies.
COPYRIGHT © 1998 CANON INC.
CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
1-1
CHAPTER 1 GENERAL DESCRIPTION
II. SPECIFICATIONS
Item Body Type Copyboard Light source Lens Photosensitive medium Copying Charging Exposure System Copy density adjustment Development Pick-up Separation Cleaning Fixing Document type Maximum document size Reproduction ratio Wait time First copy Continuous copying Copying speed Moving Tungsten lamp of fuse type Lens array OPC (24 dia.) Indirect electrostatic Roller (direct charging) Slit (moving copyboard) Manual Dry Manual tray Curvature + Static eliminator Blade Plane heater Sheet, Book, 3-D object (2 kg/4.4 lb max.) LTR/A4; LGL* 1:1 (±1.2%) 0 sec (approx.; at 20°C/68°F) 22 sec (LTR) Not available 1 to 9 copies or F 4 copies/min (approx.; A4R/LTR-R 4 copies/min (A4R/LTR-R or or smaller) smaller) 3 copies/min (LGL) A4/LTR; LGL* max.; postcard min. 52 to 128 g/m2, Tracing paper, Colored paper, OHP film, Postcard (vertical), Labels, Wrapping paper (63 g/m2) · Same edge orientation. · Copying on each side no more than twice. · Paper of 64 to 128 g/m2. · Paper of 64 to 128 g/m2. Multifeeder Automatic (AE) or Manual PC400/FC200 Portable (w/ grips) PC420/430/FC220
Performance
Copy size Copy paper type Two-sided copying
Overlay copying Multifeeder tray Copy tray Non-image width
· Copying on each side no more than three times. 5 mm deep (about 50 sheets of A4, 80 g/m2) 9 copies (approx.; A4/LTR, 80 g/m2)
2 mm (leading edge) A4: 0 mm (left/right) LTR/LGL: 2 mm (left/right) Available (5 min, approx.)
Auto power-off *PC430 only.
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 1 GENERAL DESCRIPTION
Item
PC400/FC200
PC420/430/FC220
7.5° to 32.5°C/45.5° to 90.5°F Temperature Operating 5% to 85% Humidity environment Atmospheric pressure 810.6 hPa to 1013.3 hPa (0.8 to 1 atm) Serial numbers 120V, 60Hz ZTG !!!!! (PC400:WHITE) ZTH !!!!! (PC400:GRAY) Serial numbers NVD !!!!! (FC220:WHITE) ZTJ !!!!! (PC420:WHITE) RTM/PTR !!!!! (FC220:WHITE) PTS !!!!! (FC220:WHITE) PTT !!!!! (FC220:WHITE)
Power supply 230V, 50Hz RTL/PTQ !!!!! (FC200:WHITE) UTP/UTQ 0.7 kW or less
Others
Maximum Power Standby consumption Continuous Noise Ozone Width Dimensions Depth Height Copy paper Cartridge Copying Standby
0.1 W (approx.; 5 min; reference only) 0.2 kWh (reference only) 71 dB 0.01 ppm or less (average over 8 hr) 14.1 in./359 mm 15.7 in./402 mm 4.1 in./108 mm Keep wrapped to protect against humidity. See CHAPTER 9. Sound power level by ISO
Weight (including cartridge) 16.6 lb/7.4 kg (approx.) Consumables
Specifications subject to change without notice.
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
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CHAPTER 1 GENERAL DESCRIPTION
III. NAMES OF PARTS
A. External View
(PC420/430/FC220) (PC400/FC200)
q w e r
t Delivery assembly cover open/close button y Delivery assembly cover u Copy tray Figure 1-301A
Copyboard cover Copyboard glass Pick-up tray Open/Close button
Figure 1-302A
q w e r t
Upper cover Pick-up guide Density correction switch Power switch Cartridge
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 1 GENERAL DESCRIPTION
B. Cross Section
(PC420/430/FC220)
1 2 3 4 5 6 7 8 9 10
17
16
15 14
13
12 11
(PC400/FC200)
12
11
8
9
q w e r t y u i o
Copyboard cover Copyboard glass Cleaning assembly Primary charging roller Scanning lamp Lens array Developing cylinder Registration roller Pick-up roller
!0 !1 !2 !3 !4 !5 !6 !7
Pick-up tray Transfer charging roller Photosensitive drum Fixing assembly Delivery roller Delivery tray Heat exhaust fan Delivery assembly cover open/close button
Figure 1-301B
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
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CHAPTER 1 GENERAL DESCRIPTION
IV. OPERATION
A. Control Panel
1. PC420/430/FC220 Error indications
and and and : Check jam/Supply paper : Jam : Check error : Check error : Check error
ON OFF
3
9
6 5 4
AE A
C
darker lighter
lighter
1
darker
2 4 5
6
7
8
10
q w e
r t
Figure 1-401A y Copy Count Set Key Density Control Dial · Each press on the key increases AE key the copy count (up to 9). · Press it to select/deselect AE (automatic exposure) mode. · A press while ` ' is displayed AE Indicator causes ` ' to appear, indicating all · `A' goes ON when AE mode is sheets on the pick-up tray will be selected. used for continuous copying. · `A' goes OFF when AE mode is u Clear/Stop Key deselected. · During continuous copying, the key Jam Indicator serves as a Copy Stop key; the · Flashes when paper jams inside operation stops after finishing the the copier. ongoing copy. Copy Count Indicator · During standby, the key serves as a · Displays the number of copies Clear key, setting the copy count to entered by pressing the Copy ` '. Count Set key. i Copy Start Key · The count decreases for each copy o Power Switch made; the initial number is !0 Density Correction Switch displayed after the last copy has · Switches copy density among three been made. settings (top for darker, bottom for · ` ' is displayed to indicate pick-up lighter). failure or absence of paper; ` ' is · The density is switched by varying the developing bias. displayed in response to an error found by self diagnosis.
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 1 GENERAL DESCRIPTION
2. PC400/FC200
2
ON OFF
5
lighter 1
darker 3 4
Figure 1-402A q Density Control Lever w Density Indicator e Jam Indicator · Flashes when paper jams inside the copier. · Goes and remains ON when an error (self diagnosis) occurs in the copier. r Main Indicator · Remains ON when copying is ready. t Power Switch
(right view)
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
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CHAPTER 1 GENERAL DESCRIPTION
B. Making Copies
1) Switch the copier ON. · If necessary, wait until the intensity of the scanning lamp reaches the specified value. · The wait time is about 0 second. · The copier will shut itself off in about 5 minutes if left alone without key operation. 2) Lift the copyboard cover, and place a document face down, along the size index. · Place the document so that its center is at on the size index (Figure 1-401B); then, close the copyboard cover.
Document
Size index
Figure 1-401B 3) Adjust the copy density to suit the document. 4) Slide the pick-up guide to suit the size of copy paper. 5) Set copy paper on the pick-up tray. PC420/430/FC220 Place a stack of copy paper of a size suited to the document on the pick-up tray; make sure the edges of the sheets are flush. · The stack may be 5 mm (about 50 sheets of plain paper).
Figure 1-402B 6) Set the copy count. PC420/430/FC220 Set the number of copies to make (1 to 9 or F) using the + key, and check the Copy Count indicator. 1-8
COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 1 GENERAL DESCRIPTION
7) Press the Copy Start key. PC420/430/FC220 · To stop continuous copying, press the Clear/Stop key; the copier finishes the ongoing copy and stops. The copy count displays the initial count. Copying on OHP Film · Set one sheet of film on the pick-up tray for each copy. · Depending on the environment of the site, a press on the Copy Start key may not pull the film inside the copier; if this is the case, perform the following: 1) Place copy paper under the film; stagger the sheet and film so that the leading edge of the film is about 1 cm behind that of the paper.
1cm
Figure 1-403B 2) Hold the trailing edge of the copy paper, and set the sheet and film on the pick-up tray. 3) While holding the trailing edge of the copy paper, press the Copy Start key. Remove the paper when the film begins to move into the copier; the paper will no longer serve its purpose.
Figure 1-404B Note: Take away each OHP film delivered to the copy tray.
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CHAPTER 1 GENERAL DESCRIPTION
Manual Feeding PC400/FC200 Set a document on the copyboard. Adjust the Density Control lever to suit the document. Slide the pick-up guide to suit the size of copy paper. Insert copy paper along the pick-up guide. · The copier starts copying operation automatically as soon as it detects paper. · To continue copying, insert the next paper when the copyboard starts to return.
1) 2) 3) 4)
Making Two-Sided Copies 1) Turn over the copy while maintaining its feeding direction. · Make sure that the paper is not moist or curled. · Use paper of 64 to 128 g/m2 when making two-sided copies. · Do not process each side more than twice.
Figure 1-405B Making Overlay Copies You can make two- or three-colored copies by replacing the cartridge. · Use paper of 64 to 128 g/m2 when making overlay copies. · Do not process each side more than three times.
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CHAPTER 1 GENERAL DESCRIPTION
C. Jam Indicator
The Jam indicator starts to flash when paper jams inside the copier. · Take care not to tear the paper when removing it; otherwise, be sure to remove all pieces of paper. 1) Move the copyboard to the left until it stops. 2) Press the open/close button, and open the top cover. 3) Remove the jam. · If the jam is in the pick-up or fixing assembly, hold the edge of the paper with both hands, and pull it out slowly through the opening of the top cover. · If the jam is in the delivery assembly, press the delivery assembly open/close button to open the delivery cover; then, detach the paper from the delivery cover, and pull it slowly in the direction of delivery. 4) Close the top cover and delivery cover; then, move the copyboard to the center. · To resume copying, switch the copier ON, set the desired copy count, and set the copy density.
D. Add Paper Indicator
PC420/430/FC220 ` ' flashes if you try to make a copy when the pick-up tray has run out of paper. 1) Check the pick-up tray for copy paper. 2) If no paper is on the tray, place paper. If a stack of paper is on the tray, remove it first, then place it back after putting its edges flush. 3) Press the Copy Start key. · ` ' goes OFF, and the remaining number of copies are made.
E. Replacing the Cartridge
1. Time to Replace the Cartridge When the cartridge is running out of toner, copies tend to show white lines or vertical white spots (Figure 1-401E).
Figure 1-401E
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CHAPTER 1 GENERAL DESCRIPTION
If white lines or spots appear on copies, replace the cartridge as follows: 1) Remove the cartridge from the copier, and rotate it several times as shown in Figure 1-402E.
Figure 1-402E 2) Set the cartridge back in the copier, and make a copy. a. If the output returns to normal, · The cartridge may be used further; advise the user, however, to obtain a spare cartridge. b. If the output fails to return to normal, · Replace the cartridge as described below. 2. Replacing the Cartridge 1) Move the copyboard to the left until it stops; then, press the open/close button to open the top cover. 2) Slide the cartridge out of the copier. 3) Hold the cartridge with the Warning label facing up, and rotate it about 90 degrees in both directions.
Figure 1-403E
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CHAPTER 1 GENERAL DESCRIPTION
4) Detach the tip of the seal attached to the cartridge, and pull it straight out to the front; about 50 cm.
Figure 1-404E 5) Hold the cartridge with its Warning label facing the left, and insert it in the copier with care until it butts against the rear.
Figure 1-405E 6) Close the top cover, and return the copyboard to the center. Note: You can replace the black toner cartridge with any color cartridge the same way.
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CHAPTER 1 GENERAL DESCRIPTION
F. Changing the Density
PC420/430/FC220 You have a choice of three settings for automatic density adjustment mode (AE); switch the density if the copy is too dark or too light.
Density Correction Switch
Auto density correction
Figure 1-401F Note: You can also switch the density among three settings in manual density adjustment mode.
G. Cleaning
Advise the user to clean the following if the copies are soiled. 1. Copyboard Glass/Copyboard Cover Wipe the part with a moist cloth; then, dry wipe it. If dirt cannot be removed, wipe the part using mild detergent; then, dry wipe it.
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CHAPTER 1 GENERAL DESCRIPTION
2. Lens Array 1) Move the copyboard to the left until it stops. 2) Put a cotton wad in the lens array groove, and move it back and forth lightly.
Fiber lens (face side)
Figure 1-401G 3) 4) Open the upper cover, and remove the cartridge. Put a flat-tipped cotton wad in the lens array (rear) groove, and move it back and forth.
Figure 1-402G
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CHAPTER 1 GENERAL DESCRIPTION
3. Pick-Up Roller 1) Open the top cover. 2) Dry wipe the pick-up roller while rotating it in pick-up direction with a cloth. Note: Do not make copies until the pick-up roller has completely dried.
Pick-up roller
Figure 1-403G
H. When Not Using the Copier for a Long Time
Advise the user to perform the following if she/he does not have any plan to use the copier for a long time. 1) Disconnect the power plug. 2) Place the copier in a dust-free, sunlight-free place.
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CHAPTER 1 GENERAL DESCRIPTION
V. IMAGE FORMATION
A. Outline
Copyboard glass Scanning lamp Primary charging roller Developing blade Fixing film Cleaning blade Developing cylinder Lens array
Photosensitive drum
Transfer charging roller Static eliminator Pressure roller
Figure 1-501A The copier is an indirect photorepro graphic system constructed as shown in Figure 1-501A. The image formation process con sists of seven steps as discussed below. Step 1 : Primary charging (negative) Step 2 : Image exposure Step 3 : Development (AC and DC bias) Step 4 : Transfer (negative) Step 5 : Separation Step 6 : Fixing Step 7 : Drum cleaning
Latent static Image Formation
1. Primary charging
2. Image exposure
7. Drum cleaning
3. Development
4. Transfer Delivery
6. Fixing 5. Separation Registration
Multifeeder
: Flow of copy paper : Rotation of drum
Figure 1-502A The photosensitive drum has a layer construction: the photoconductive layer on the outside and the conductive alu minum base, inside.
Photoconductive layer Aluminum base
Figure 1-503A
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CHAPTER 1 GENERAL DESCRIPTION
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CHAPTER 2 BASIC OPERATION
This chapter outlines the machine's basic mechanisms and functions, relationship between electrical and mechanical systems, and the timing of operation of respective parts.
I.
BASIC OPERATION ....................2-1 A. Outline ....................................2-1 B. Outline of Electrical Circuit......2-2 C. Basic Sequence of Operations (A4, 2 copies)..........................2-3
D. Main Motor Control Circuit ......2-5 E. Inputs to DC Controller ...........2-6 F. Outputs from DC Controller ....2-8
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CHAPTER 2 BASIC OPERATION
I. BASIC OPERATION
A. Outline
The copier can be divided into four functional blocks: pick-up/feeding, exposure, image formation, and control blocks.
Control Block Control panel Exposure Block Copyboard Document exposure system Optical path Image Formation Block
Control circuit
Primary charging roller Drum cleaning Photosensitive drum
Developing assembly
tray
Feeding Copy tray Fixing assembly/Delivery assembly
Transfer/ Separation
Pick-up control assembly
Pick
-up
Pick-up/Feeding Block
Figure 2-101A
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CHAPTER 2 BASIC OPERATION
B. Outline of Electrical Circuit
The copier's main electrical mechanisms are controlled by the microprocessor on the DC controller/DC power supply PCB. According to the program stored in advance, the microprocessor reads input signals from the control keys, and generates signals to drive such loads as motors, solenoids, and lamps, as necessary.
DC controller/DC power supply PCB Copyboard position sensor Q Delivery sensor Pick-up sensor Photointerrupter Driver assembly Fixing heater temperature sensor TH1 Thermistor Power switch Control key Scanning lamp Main motor Solenoid DC load
Microprocessor
Primary/Transfer charging roller High-voltage transformer Developing cylinder
Display Q101 +DC24V +DC5V +DC5V Sub power supply circuit DC power supply PCB
Door switch
Delivery door switch
Relay AC driver
Heater AC load
Driver
Scanning lamp
Figure 2-101B
2-2
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CHAPTER 2 BASIC OPERATION
C. Basic Sequence of Operations (A4, 2 copies)
Copy paper inserted (PC400/FC200) Copy Start key ON Copy paper inserted (PC400/FC200) Power switch ON Sequence Copyboard Main motor 1 (M1) 2
Scanning lamp (LA1-LA8) STBY INTR
CBRV STOP
CBRV CBFW COPY CBRV CBFW LSTR STOP
STBY
2 sec
3 Primary AC bias 4 Primary DC bias Transfer 5 charging 6 7
Copyboard drive solenoid (SL2)
Pick-up solenoid * Registration 8 solenoid ** Registration 9 roller Fixing heater 10 (H1)
*PC420/430/FC220 **PC400/FC200
Figure 2-101C
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CHAPTER 2 BASIC OPERATION
Period STBY (Standby) Between when the copier is switched ON and when the Copy Start key is pressed. Between when LSTR is over and when the Copy Start key is pressed. For about 6 sec after STBY is over.
Description Waits for a press on the Copy Start key.
Remarks
INTR (Initial Rotation)
Executes pick-up. Removes residual charge from the photosensitive drum and stabilizes the drum sensitivity in preparation for copying operation. The scanning lamp illuminates the document, and the reflected optical image is projected to the photosensitive drum through the lens array. Returns the copyboard to the start position in preparation for the next copy; if last copy, the copyboard is returned to the home position. Discharges the last copy.
The copyboard moves from the home position to the start position.
CBFW (Copyboard Forward)
While the copyboard is moving forward (about 10 sec).
The copy paper is moved to the transfer assembly.
COPY
CBRV (Copyboard Reverse)
While the copyboard is moving in reverse (about 4 sec).
In continuous copying, the pickup signal is generated for pick-up operation.
LSTR (Last Rotation)
After CBRV for the last copy is over until 3 sec after the copy paper has moved past the delivery sensor.
Table 2-101C
2-4
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CHAPTER 2 BASIC OPERATION
D. Main Motor Control Circuit
1. Outline Figure 2-101D shows the circuit that controls the main motor (M1), and the circuit has the following functions: a. b. turns the main motor ON and OFF. controls the main motor speed (constant)
The main motor (M1) is a DC motor and is equipped with a motor rotation sensor (Q901) to serve as a clock pulse generator. Clock pulses (MMCLK) corresponding to the revolution of the motor are generated while the motor is rotating. The speed control circuit controls the speed of the motor with reference to these clock pulses. 2. Operation The drive circuit on the DC controller/DC power supply PCB causes the main motor drive command (MMD) to go `0' in response to instructions from the microprocessor, thereby causing the main motor to rotate at a specific speed. 3. Overcurrent Sensor When the overcurrent sensor circuit detects an overload in the main motor (M1), the speed controller circuit exerts control so that the rotation of the motor is slowed down. If the revolution of the main motor falls below a specific revolution, however, an error associated with `E2' can occur.
Overcurrent detection circuit
Microprocessor (Q101)
Speed control circuit
+24V
Drive circuit
J201 -5
(+)
Main motor drive
-4 command (MMD) (-)
M1
Q901
Main motor
Q101
Motor rotation detection PCB Main motor clock pulse -1 signal (MMCLK)
DC controller/DC power supply PCB
Figure 2-101D
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CHAPTER 2 BASIC OPERATION
E. Inputs to DC Controller
1. Inputs to DC Controller (1/2)
DC controller/DC power supply PCB
Door switch SW1 AC power supply
Delivery door switch SW2 J104 J103
Density correction switch (PC420/430/ FC220)
0 1 2 SW606 (bottom: lightens) (top: darkens) J601 -20(-15) J601 -2 J601 -1 J202 -3 DGT 2 Oscillation signal (output) J202 -21 Press on any key or density KEYR 2 J202 correction switch allows input -22 of oscillation signal. KEYR 3 (PC420/430/FC220 only)
SW601 ( ) SW602 (+ ) SW603 (C/S) SW605 (AE)
J601 -19 J601 -15
J202 -4 J202 -8
DGT 0 DGT 1 Oscillation signal (output; PC420/430/FC220 only)
Power switch
SW604
J601 -14(-10) J601 -21(-16) J601-13(-8) J601-22(-17)
J202 -9(-8) J202 -2 J202-10 J202-1
PWSON 5V
When `0', power switch goes ON.
+5V Density adjustment dial/lever VR601
+5V
Turning density adjustment dial varies voltage. (turn to darken brings it closer to 0V)
Control panel PCB Note: The pin No. in parentheses refers to the PC400/FC200.
Figure 2-101E 2-6
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CHAPTER 2 BASIC OPERATION
2. Inputs to DC Controller (2/2)
DC controller/DC power supply PCB Delivery detection PCB
Delivery detection J801 J603
Q801 -3 -3 -1 -5 -2 -4
J601 -15(-10) J601 -12(-7) J202 -8 J202 -11 J202 -12
DGT1 KEYR0 TH1
Oscillation signal (output) When Q801 detects copy paper, oscillation signal (DGT1) is input. When surface temperature of fixing heater increases, voltage lowers.
Fixing heater surface temperature detection
J603 -1 TH1 -2 J621
J601 -11(-6)
PD601 PD602 AE sensor/ intensity sensor Copyboard position detection Control panel PCB
J905 -2 Q902 -3 -1
J601
J202
See Chap.4.
J201 -11
DGTO
Oscillation signal (output)
-10 -12
When Q902 detects copyboard KEYRO start position or reversal position, oscillation signal (DGT0) is input. +5V
Copyboard position detection PCB
J904 -2 -2
Motor rotation detection
Q901
-3 -1 -1 -3
Motor rotation detection PCB Pick-up detection
MMCLK Clock pulses corresponding to revolution of main motor are generated. DGT2
Q131
Oscillation signal (output)
KEYR0 When Q131 detects copy paper, oscillation signal (DGT2) is input.
Note: The pin No. in parentheses refers to the PC400/FC200.
Figure 2-102E
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CHAPTER 2 BASIC OPERATION
F. Outputs from DC Controller
1. Outputs from DC Controller (1/2)
DC controller/DC power supply PCB
Thermal fuse 2 FU2 H1 Fixing heater LA1 to LA8 Scanning lamp Lamp PCB J906 -1 -2
J101 J102 See Chap.6.
Thermal fuse 1 J108 FU1 -1 -2 See Chap.3.
+24V J903 -1 Main motor M1 -2 J201 -5 -4 MMD When `0', main motor goes ON.
High voltage output
See Chap.4.
Figure 2-101F
2-8
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CHAPTER 2 BASIC OPERATION
2. Outputs from DC Controller (2/2) a. PC420/430/FC220
DC controller/DC power supply PCB J901 -1 SL1 -2 J201 +24V -7 -6 PUSD When `0', SL1 goes ON.
Pick-up solenoid
Copyboard drive solenoid
J902 -1 SL2 -2
J101 +24V -9 -8 CBSD When `0', SL2 goes ON. (voltage to SL2 is switched between 24V and 15V to ensure stable operation)
Figure 2-102F b. PC400/FC200
DC controller/DC power supply PCB J901 -1 SL1 -2 J201 +24V -7 -6 RGSD When `0', SL1 goes ON.
Registration solenoid
Copyboard drive solenoid
J902 -1 SL2 -2
J101 +24V -9 -8 CBSD When `0', SL2 goes ON. (voltage to SL2 is switched between 24V and 15V to ensure stable operation)
Figure 2-103F
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CHAPTER 2 BASIC OPERATION
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CHAPTER 3 EXPOSURE SYSTEM
This chapter outlines the machine's copyboard drive and scanning lamp control systems in relation to mechanisms and functions, relationship between electrical and mechanical systems, and the timing of operation of respective parts.
I.
EXPOSURE/COPYBOARD DRIVE SYSTEM ......................................3-1 A. Outline of Exposure System ...3-1 B. Copyboard Drive System........3-1 II. Controlling the Scanning Lamp....3-7 A. Outline ....................................3-7
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B. Operations ..............................3-8 C. Controlling the Intensity of the Scanning Lamp (VR604) ........3-8 III. MECHANICAL SYSTEM..............3-9 A. Scanning System..................3-10 B. Copyboard Drive Assembly...3-11 1
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CHAPTER 3 EXPOSURE SYSTEM
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CHAPTER 3 EXPOSURE SYSTEM
I. EXPOSURE/COPYBOARD DRIVE SYSTEM
A. Outline of Exposure System
While the copyboard is moving forward, the scanning lamp (LA1 through LA8) illuminates the document, and the reflected light is projected to the photosensitive drum through the lens array.
Copyboard glass
Scanning lamp
Lens array
Photosensitive drum
Figure 3-101A
B. Copyboard Drive System
1. Outline The copyboard is moved forward or in reverse by transmitting the drive of the main motor (M1) to the copyboard drive gear (pinion). Figure 3-101B illustrates the movement of the copyboard.
1
Copyboard Home 2 Position (HP)
3
Copyboard Start Position (SP) Forward
4
Copyboard Reversal Position Reverse
5
Home Position Stop
Copyboard Reverse
Copier Continuous copying
Figure 3-101B Front View
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CHAPTER 3 EXPOSURE SYSTEM
Copyboard position sensor (Q902) Forward Reverse
Description · Copyboard is at the home position. · Copyboard solenoid goes ON in response to a press on the Copy Start key or insertion of copy paper.
Copyboard position (cams)
Reversal cam Registration cam Start position cam
Reverse
Copyboard position sensor lever
Copyboard position sensor (Q902): OFF
(front view)
· Copyboard is at the start position. · Copyboard drive solenoid goes OFF. · Scanning lamp ON. Q902:ON
Forward
Q902:OFF
· Copyboard is at the reversal position. · Copyboard drive solenoid goes OFF. · After a specific period, copyboard drive solenoid goes ON. · Pick-up solenoid goes ON (continuous copying). · Scanning lamp OFF. · For the last copy, the copy board drive solenoid goes OFF at the copyboard home position.
Q902:ON © OFF
Q902:ON © OFF
Table 3-101B
3-2
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Continuous copying
· The copyboard drive solenoid goes ON about 0.5 second after the Copy Start key is pressed. · AE measurement starts. · Registration roller goes ON (by registration cam).
CHAPTER 3 EXPOSURE SYSTEM
2. Controlling the Copyboard Drive The copyboard is controlled for forward, reverse, and stop operations by the copyboard drive solenoid (SL2) and forward/ reverse switching mechanism. A photosensor (Q902) is provided on the copyboard drive assembly to monitor the position of the copyboard; as the copyboard moves, the cam found under the copyboard pushes the copyboard sensor lever to turn the photosensor ON or OFF. `E2' is displayed if the copyboard fails to complete its movement within a specific period of time. In response to the signal from Q902, the DC controller controls the timing for paper transport and the movement (forward, reverse, stop) of the copyboard; see Table 3101B.
Start position cam Registration cam Rack Copyboard position sensor lever Copyboard position sensor Q902
Copyboard position sensor signal
Forward
Copyboard glass Reversal cam J201 Copyboard drive gear -10
Copyboard drive solenoid drive command (CBSD)
J201 -9
Copyboard drive solenoid SL2
DC controller/ DC power supply PCB
Forward Forward/Reverse Reverse gear switching mechanism gear
J201 -4
Main motor drive command (MMD)
M1
Main motor
Figure 3-102B Front View
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CHAPTER 3 EXPOSURE SYSTEM
3. Mechanism of Copyboard Drive Assembly The forward gear and reverse gear are rotating in the direction of the arrow (Figure 103B) while the main motor (M1) is operating. The forward/reverse switching mechanism engages with either the forward gear or the reverse gear depending on the orientation of the copyboard position sensor lever and the state (ON/OFF) of the copyboard drive solenoid (SL2) operated by the start position cam or reversal cam; when not engaged, the mechanism is said to be free, and the copyboard can be moved by hand. The above mechanism is used to move the copyboard forward and reverse or to stop it.
Copyboard (rack) Forward/Reverse switching mechanism Reversing gear
Forward
Start position cam
Copyboard position lever Copyboard drive gear (pinion) Forward gear
Reverse
Main motor gear
Reversing cam
Copyboard drive solenoid (SL2)
M1
Main motor
Figure 3-103B
Copyboard position sensor lever Down Copyboard drive solenoid (SL2) ON OFF forward Up reverse
stop (free)
Note: i. The direction (forward/reverse) is switched when the copyboard drive solenoid is OFF. ii. The direction of the drive is maintained while the copyboard drive solenoid is ON. Table 3-102B
3-4
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CHAPTER 3 EXPOSURE SYSTEM
a.
Stopping the Copyboard Causing the copyboard drive solenoid (SL2) to go OFF frees both forward and reverse gears so that the copyboard remains stationary. At the time, the copyboard may be moved to the right or left by hand. b. Moving the Copyboard in Reverse When SL2 goes ON while the main motor is operating, the forward/reverse switching mechanism engages with the reverse gear, and the reverse gear rotates in the direction of the arrow, causing the copyboard to move in reverse. The copyboard moves in reverse about two times as fast as when it moves forward owing to the difference in the gear ratio.
Copyboard drive gear
Reversing gear Forward/Reverse switching mechanism
Reverse
M1 Main motor Copyboard drive solenoid (SL2)
Figure 3-104B
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CHAPTER 3 EXPOSURE SYSTEM
Moving the Copyboard Forward When the copyboard has moved in reverse and is positioned as shown in Figure 3105B, the start position cam pushes down the copyboard position sensor lever. When SL2 goes ON in this position, the forward/reverse switching mechanism moves to the position shown in the figure, causing the forward/reverse switching mechanism to engage with the forward gear; as a result, the forward gear rotates in the direction of the arrow, moving the copyboard forward.
Copyboard drive gear
c.
Forward gear
Forward
Forward/Reversal switching mechanism
Start position cam M1 Main motor Copyboard drive solenoid (SL2)
Figure 3-105B
3-6
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CHAPTER 3 EXPOSURE SYSTEM
II. Controlling the Scanning Lamp
A. Outline
Figure 3-201A shows the circuit that controls the scanning lamp (fuse lamp), and the circuit has the following functions: · Turns the scanning lamp ON and OFF. · Controls the intensity of the scanning lamp. An intensity sensor (PD601) is provided to ensure that the original will be illuminated after the intensity of the scanning lamp has stabilized. The intensity of the scanning lamp is checked by the lamp intensity detection signal (LID) to make sure that the intensity has reached the specified value. In addition, a rush current protection circuit is provided to prevent rush current occurring when the lamp turns on.
Scanning lamp (LA1-LA8) J108-1 J621 -4 Q143 +
+24VU
Intensity sensor -3 (PD601) (-1)
J108-2
Rush current protection circuit
Lamp driver circuit Lamp ON signal (LAPWM)
VR604 +
J601 -10 (-5)
J202 -13
Lamp intensity sensor signal (LID)
5V Amplifier circuit
Control panel PCB
DC controller/DC power supply PCB
The number within parentheses represents the PC400/FC200.
FIgure 3-201A
Microprocessor
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CHAPTER 3 EXPOSURE SYSTEM
B. Operations
1. Turning the Scanning Lamp ON and OFF · Square waves of the LAPWM command corresponding to the output of the amplifi er circuit are generated to the lamp driver circuit. (Q143 ON) Current flows into the filament of the lamp, causing the fluorescent lamp to go ON at high frequency. 2. Controlling the Intensity of the Scanning Lamp · If the intensity of the lamp is low when the lamp goes ON, Initial power of the intensity sensor PD601 is low. Output voltage of the amplifier circuit is high. Duty ratio (H) of the output of the microprocessor (LAPWM com mand) grows high. Current flowing to the lamp increases. · If the intensity of the lamp is high when the lamp goes ON, Initial power of the intensity sensor PD601 is high. Output voltage of the amplifier circuit is low. Duty ratio (H) of the output of the microprocessor (LAPWM com mand) grows low. Current flowing to the lamp decreases. · If the microprocessor finds out that the scanning lamp has remained on for 2 min at such times as not prescribed, it activates the self diagnostic mechanism; the results are indicated by `E6' for the PC420/430/FC220 and `JAM' for the PC400/FC200.
C. Controlling the Intensity of the Scanning Lamp (VR604)
You must adjust the intensity of the lamp if you have replaced the scanning lamp unit, intensity sensor or control panel PCB; see p.10-6. Note: You must adjust the AE mechanism after adjusting the intensity. (PC420/430/FC220)
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 3 EXPOSURE SYSTEM
III.MECHANICAL SYSTEM
Here, the copier is discussed in terms of its mechanical characteristics and operation and how to disassemble and assemble it. Be sure to observe the following for disassembly/assembly work: 1. ! Disconnect the power cord for safety before disassembly or reassembly work. 2. Unless otherwise noted, reassembly is the reverse of disassembly. 3. Group the screws by type (length and diameter) and location. 4. One of the mounting screws used on the rear cover is provided with a washer to protect against static electricity. Be sure to keep the washer with the screw when mounting the cover. 5. The fixing screw for the grounding wire and varistors is fitted with a washer to ensure electric continuity; be sure to use the washer for reassembly. 6. If possible, avoid operating the machine with any of its parts removed.
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
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CHAPTER 3 EXPOSURE SYSTEM
A. Scanning System
1. Detaching the Scanning Lamp Unit 1) Detach the top cover assembly. 2) Disengage the two hooks q and pins w, and detach the lamp unit e.
disengage
Figure 3-301A Caution: The scanning lamp is adjusted at the factory with high precision to ensure the best intensity of light; if necessary, replace it as part of the scanning lamp unit; see Figure 3302A.
Scanning lamp unit
Figure 3-302A
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 3 EXPOSURE SYSTEM
B. Copyboard Drive Assembly
1. Detaching the Copyboard Drive Assembly 1) Take out the fixing assembly. 2) Remove the screw and remove the grounding wire q; remove the screw, and remove the motor rotation detecting PCB w; then, disconnect the four connectors e.
Figure 3-301B (rear view)
3) Remove the screw r, and detach the cartridge support t.
(rear)
Figure 3-302B Note: Take extra care not to damage the teeth of the gear when lifting the copyboard drive assembly.
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
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CHAPTER 3 EXPOSURE SYSTEM
4) Remove the four screws (t, M4X8, yellow; y, M3X6, white), and detach the copyboard drive assembly u as if to lift it.
Figure 3-303B
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COPYRIGHT © 1998 CANON INC.
CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
This chapter outlines the machine's image formation system in relation to mechanisms and functions, relationship between electrical and mechanical systems,and the timing of operation of respective parts.
I.
PROCESS DESCRIPTION..........4-1 A. Outline ....................................4-1 B. Sequence of Image Formation Operations (A4, 2 copies) .......4-2 C. Primary Charging Control Circuit ................................................4-3 D. Controlling Developing Bias....4-6 E. Transfer Charging Control Circuit ..............................................4-10
Document Density Measurement (AE; PC420/430/FC220).......4-14 II. CHARGING, DEVELOPING, AND CLEANING SYSTEMS ..............4-17 A. Cartridge ...............................4-17 III. MECHANICAL SYSTEM............4-18 A. Photosensitive Drum.............4-19 B. Transfer Charging Roller.......4-20 1
F.
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CHPTER 4 IMAGE FORMATION SYSTEM
Blank Page
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHPTER 4 IMAGE FORMATION SYSTEM
I. PROCESS DESCRIPTION
A. Outline
The copier's image formation system has the following functions: · · · · Controls the scanning lamp. Controls the primary charging. Controls the transfer charging. Controls the developing bias.
Lamp intensity sensor Scanning lamp
AE sensor
Lens array
Primary charging roller
Developing cylinder
Static eliminator
J621-4
-2
Photosensitive drum Transfer charging roller
Lamp ON command (LAPWM)
Lamp intensity sensor signal (LID)
J601-10
-4 AE signal (AE)
Transfer charging high voltage
Primary corona high voltage
Control panel PCB
J202-13
-19
DC controller/DC power supply PCB
Note : The AE sensor is provided for the PC420/430/FC220 only.
Figure 4-101A
Developing bias
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
4-1
CHPTER 4 IMAGE FORMATION SYSTEM
B. Sequence of Image Formation Operations (A4, 2 copies)
Copy paper inserted (PC400/FC200) Copy Start key ON Copy paper inserted (PC400/FC200) Power switch ON Sequence Copyboard Main motor 1 (M1) Scanning lamp 2 (LA1-LA8) 3 Primary AC bias 4 Primary DC bias 5 Transfer charging 6 Developing AC bias Developing 7 DC bias
4 sec 1.5 sec STBY INTR CBRVSTOP COPY CBRV CBRV CBFW CBFW LSTR STOP
STBY
Scanning lamp Primary DC bias Developing DC bias
: ON : -230V : -625V : -400V : -120V to -560V (variable according to density control dial/ lever, AE) Transfer charging
: Cleaning mode : Measurement mode : Transfer
Figure 4-401B
4-2
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHPTER 4 IMAGE FORMATION SYSTEM
C. Primary Charging Control Circuit
1. Outline Figure 4-101C shows the circuit that controls the primary charging, and the circuit has the following functions: · Turns the DC bias ON and OFF. · Turns the AC bias ON and OFF. · Controls the DC bias voltage (constant). · Controls the AC bias current (constant). A DC bias (-625 V/-230 V) and an AC bias are applied to the primary charging roller to maintain the surface potential of the photosensitive drum uniform. During document exposure (-625 V) and non-exposure periods (-230 V) DC bias is switched by the DC bias high output command (HVPHO). The DC bias and AC bias are turned ON and OFF by the DC bias ON command (HVPDC) and AC bias ON command (HVPAC), respectively. Reference: Unless the document is being illuminated, the DC bias is switched to -230V to prevent adhesion of toner on the photosensitive drum.
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
4-3
CHPTER 4 IMAGE FORMATION SYSTEM
2. Operations a. HVPDC=1, HVPHO=1 (copying) DC bias control circuit set to `-625 V'. Transformer T106 generates `DC bias'. HVPAC=1 Oscillation control circuit goes ON. Transformer T103 generates AC bias Primary charging (DC bias + AC bias) goes ON. b. HVPDC=1, HVPHO=0 (document not exposed) DC bias control circuit set to `-240 V'. Transformer T106 generates DC bias. HVPAC=1 Oscillation control circuit goes ON. Transformer T103 generates AC bias. Primary charging (DC bias + AC bias) goes ON. c. HVPDC=0, HVPHO=0 (standby) DC bias control circuit goes OFF. Transformer T106 DC bias goes OFF. HVPAC=0 Oscillation control circuit goes OFF. Transformer T103 goes OFF. Primary charging (DC bias + AC bias) goes OFF.
4-4
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CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHPTER 4 IMAGE FORMATION SYSTEM
J6 Primary charging roller DC current detection Transformer (T106) Transformer (T103) Photosensitive drum
Current detection
Amplifier
DC bias control circuit
Oscillation control circuit Oscillation circuit AC bias ON command (HVPAC)
DC bias ON command (HVPDC)
DC bias high output command (HVPHO) Microprocessor
DC controller/DC power supply PCB
Figure 4-101C
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CHPTER 4 IMAGE FORMATION SYSTEM
D.
Controlling Developing Bias
1. Outline Both AC bias and DC bias are applied to the developing cylinder during copying operation. When the photosensitive drum is rotating except during de