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Canon Canon Plain Paper Copier, NP6621 J. Blank Exposure Control

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OPERATIONS AND TIMING

1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)

J. Blank Exposure Control

1. Outline

The machine directs light from the pre-exposure

lamp to the photosensitive drum by way of a reflecting

plate for blank exposure, thereby blanking out gaps

between sheets of paper and non-image areas.

The machine’s blank exposure area is controlled

by two slide shutters and one open/close shutter.

Figure 3-315

Lens motor M3

Change solenoid (SL1)

Slide shutter (rear)

Size blanking

reflecting plate

Gear A

Gear B

Full blanking

reflecting plate

Blanking

shutter

solenoid

(SL3)

Pre-exposure lamp

Open/close shutter

Blanking shutter

home position sensor

(PS3)

Slide shutter

(front)

DC controller PCB

Blanking shutter solenoid drive signal

(BSSLD*)

Blank home position detection

signal (BSHP)

Change solenoid drive signal (CHSLD*)

Contents

Main COPYRIGHT 1998 CANON INC. Introduction Service Information i ii Introduction iii CONTENTS CHAPTER 1 GENERAL DESCRIPTION CHAPTER 2 COPYING PROCESS CHAPTER 3 OPERATIONS AND TIMING iv CHAPTER 5 INSTALLATION CHAPTER 4 MECHANICAL SYSTEM v CHAPTER 6 MAINTENANCE AND SERVICING APPENDIX Page CHAPTER 1 GENERAL DESCRIPTION Page 11 I. FEATURES 1. Multiple front loading and multifeeder for space saving. 2. Office conveniences and ecology. 3. Dependable high image quality. 4. Practical basic features. II. SPECIFICATIONS 2. Type A. Copier 1. Configuration 13 3. Performance 14 4. Others 15 B. Cassette Feeding Module-B2/Cassette Feeding Module-A2/ Cassette Feeding Unit-K1 16 C. Paper Deck Pedestal-K1 17 III. NAMES OF PARTS A. Exterior 18 B. Cross Section 1. Cross Section of the Body 19 2. Cassette Feeding Module-A2 110 3. Cassette Feeding Unit-K1 111 4. Paper Deck Pedestal-K1 Page 113 Table 1-401 2 4 Figure 1-401 IV. BASIC OPERATION A. Control Panel 123 7 8 9 10 11 15 20 21 22 23 4 5 6 12 13 14 16 17 18 19 24 25 26 A Page GENERAL DESCRIPTION 115 e q Figure 1-402 w Table 1-403 B. Making Copies 1) Place your originals. 2) Programme the copy settings. 3) Press the key. 117 C. Using the Stack Bypass 1) Place your originals. 2) Programme the copy settings. 3) Open the stack bypass. Page 119 7) Press the key. D. User Mode 2. The Use of Keys and Displays That Appear When Changing the Settings 120 3. Auto Clear Time 4. Auto Energy Saver Time 121 5. Zoom Fine Adjustment 122 6. Auto Cassette Switching ON/OFF 123 7. Stack Bypass Size Entry ON/OFF 8. Auto Sort ON/OFF (When equipped with the ADF/RDF and Stapler Sorter/ Sorter (options)) 124 9. Feeder Cleaning (When equipped with the ADF/RDF (options)) 10. Standard Copy Settings (Store/Ini- tialize) 125 11. Initializing User Mode 126 V. WARNINGS AND ACTIONS A. Jam Indicator 1. When q Flashes on the Control Panel 127 128 2. When w Flashes on the Control Panel 129 130 3. If Lights (Checking the Right Door/Sorter/Stapler Sorter) 131 4. If Flashes (Replacing the Toner Cartridge) 132 133 B. Cleaning the Static Charge Eliminator 134 VI. ROUTINE CLEANING CHAPTER 2 COPYING PROCESS Page 21 I. IMAGE FORMATION 22 B. Latent Static Image Formation Block latent static 23 C. Step 1 (pre-exposure) Primary charging roller D. Step 2 (primary charging) primary charg- ing Pre-exposure lamp F. Step 4 (development) Dark Light area light E. Step 3 (image exposure) Toner Blade Cylinder Magnet G. Step 5 (transfer) development bias 26 H. Step 6 (separation) Transfer roller Static eliminator Transfer roller J. Step 8 (drum cleaning) 27 I. Step 7 (fixing) 28 II. AUXILIARY PROCESS A. Blank Exposure CHAPTER 3 OPERATIONS AND TIMING Page 31 I. BASIC OPERATIONS Figure 3-101 A. Functional Construction 32 B. Outline of Electrical Cir- cuitry Figure 3-102 33 C. Inputs to the DC Controller Figure 3-103 1. Inputs to the DC Controller PCB (1/5) 34 2. Inputs to the DC Controller (2/5) Figure 3-104 35 3. Inputs to the DC controller (3/5) Figure 3-105 36 4. Inputs to the DC Controller PCB (4/5) Figure 3-106 37 5. Inputs to the DC Controller PCB (5/5) Figure 3-107 38 D. Outputs from the DC Controller Figure 3-108 1. Outputs from the DC Controller PCB (1/5) 39 2. Outputs from the DC Controller PCB (2/5) Figure 3-109 310 3. Outputs from the DC Controller PCB (3/5) Figure 3-110 311 4. Outputs from the DC Controller PCB (4/5) Figure 3-111 312 5. Outputs from the DC Controller PCB (5/5) Figure 3-112 313 E. Inputs to and Outputs from the Cassette Feeding Module-B2 Figure 3-113 1. Inputs to and Outputs from the Cassette Feeding Module-B2 Driver PCB (1/1) 314 F. Inputs to and Outputs from the Cassette Feeding Module-A2 Figure 3-114 1. Inputs to and Outputs from the Cassette Feeding Module-A2 Driver PCB (1/2) 315 2. Inputs to and Outputs from the Cassette Feeding Module-A2 Driver PCB (2/2) Figure 3-115 316 G. Inputs to and Outputs from the Cassette Feeding Unit-K1 Figure 3-116 1. Inputs to and Outputs from the Cassette Feeding Unit-K1 Driver PCB (1/3) 317 2. Inputs to and Outputs from the Cassette Feeding Unit-K1 Driver PCB (2/3) Figure 3-117 318 3. Inputs to and Outputs from the Cassette Feeding Unit-K1 Driver PCB (3/3) Figure 3-118 319 4. Inputs to Paper Deck-K1 Controller (1/2) Figure 3-119 320 5. Outputs from Paper Deck-K1 Controller (2/2) Figure 3-120 321 H. Main Motor Control Circuit 2. Operations 322 I. Basic Sequence of Operations (2 copies, continuous, AE) Figure 3-122 323 Table 3-101 324 J. Original Size Detection Control 325 2. Operations 326 3. Original Size Detection 327 B. Lens Drive System II. EXPOSURE SYSTEM A. Varying the Reproduction Ratio 328 Lens home position Change solenoid drive signal (CHSLD*) Lens motor drive signal Figure 3-202 329 2. Lens Motor Drive Circuit 330 3. Basic Sequence of Operations for the Lens Drive System (enlargement/ reduction) 331 C. Scanner Drive System 332 2. Relationship between Scanner Sensors and Signals 3. Basic Sequence of Scanner Operations 333 4. Driving the Scanner Motor 334 D. Operations of the Scanner in Page Separation Mode 335 III. IMAGE FORMATION 336 B. Sequence of Operations (image formation system) Figure 3-302 337 C. Controlling the Scanning Lamp 2. Mechanism 338 D. Controlling the Primary Charging Roller Page 340 341 E. Controlling the Transfer Roller Bias 342 Figure 3-306 343 2. Turning ON/OFF the Transfer Roller Bias 3. Controlling the Transfer Bias Constant Voltage 4. Correcting the Transfer Bias Voltage Level (ATVC control) 5. Current Limiter Circuit (transfer bias) F. Controlling the Static Elimi- nator Bias 345 2. Switching the Voltage Level of the Static Eliminator Bias 3. Ensuring Separation of Thin Paper 346 G. Controlling the Developing Bias 347 2. Turning ON/OFF the Developing Bias DC Component and Controlling to Constant Voltage 3. Turning ON/OFF the Developing Bias 4. Controlling the Voltage Level of the Developing Bias DC Component 348 H. Copy Density Automatic Control 2. Control Operations 349 3. AE Adjustment 350 I. Developing/Cleaning As- sembly 351 2. Toner Level Detection Control 352 353 J. Blank Exposure Control Change solenoid drive signal (CHSLD*) signal (BSHP) Blank home position detection (BSSLD*) 354 2. Blanking the Non-Image Area (re- duction) 3. Blanking the Leading/Trailing Edge Margin and Sheet Gap 355 K. Primary Charging Roller Cleaning Control 2. Primary Charging Roller Cleaning Operations 356 L. Transfer Roller Locking/ Releasing Control 357 IV. PICK-UP/FEEDING A. Pick-Up from the Machine 358 Figure 3-401 359 Figure 3-402 360 2. Sequence of Operations (pick-up/feeding system; A4, 2 copies, cassette 1) Figure 3-404 Figure 3-403 3. Sequence of Operations (pick-up/feeding system; A4, 2 copies, cassette 2) B. Making Two-Sided Copies (1 copy) 362 Copying on the 2nd Side Figure 3-408 Figure 3-407 2. Sequence of Operations (two-sided; 1 copy, A4) C. Duplexing Unit 364 2. Set-Back Operations Figure 3-411 Figure 3-410 365 366 367 368 369 3. Re-Pick Up Operation 370 371 372 D. Pick-Up from the Cassette Feeding Module-A2 1. Pick-Up Operation 373 2. Sequence of Operations (cassette 3; A4, 2 copies) Figure 3-427 374 E. Pick-Up from the Cassette Feeding Unit-K1 1. Pick-Up Operation 375 2. Sequence of Operations (pick-up/feeding system; A4, 2 copies, cassette 3) Figure 3-430 Figure 3-429 3. Sequence of Operations (pick-up/feeding system; A4, 2 copies, cassette 5) F. Paper Deck Pedestal-K1 Figure 3-431 1. Basic Construction 377 2. Pick-Up/Feeding Operation 378 b. Sequence of Pick-Up Operations (A4, 2 copies) Figure 3-433 379 3. Lifter Operation 380 b. Lifter Operation Figure 3-435 381 4. Detecting Paper in the Deck 382 G. Multifeeder 383 2. Identifying the Size of Paper on the Multifeeder Tray 384 3. Sequence of Operations (multifeeder; A4, 2 copies) Figure 3-440 385 H. Identifying the Size of the Cassette 386 387 I. Fixing/Delivery Assembly 1. Controlling the Fixing Roller Tem- perature 388 Target temperatures for the following size paper: Table 3-403 389 2. Oil Application Roller 390 3. Operation of Fixing Assembly Tem- perature Control System Figure 3-443 391 4. Detecting Overheating of the End of the Fixing Heater 5. Protection Mechanism 392 J. Detecting Jams 393 1. Vertical Path Roller 1 Delay Jam 2. Vertical Path Roller Timing Jam 394 3. Vertical Path Roller 2 Delay Jam Figure 3-447 Sequence of Operations Figure 3-446 Sequence of Operations 4. Vertical Path Roller 2 Timing Jam 395 5. Pre-Registration Delay Jam (vertical path roller) Figure 3-449 Sequence of Operations Figure 3-448 Sequence of Operations 6. Pre-Registration Timing Jam (vertical path roller) 396 7. Separation Delay Jam 8. Separation Timing Jam 397 9. Delivery Delay Jam Figure 3-452 Sequence of Operations 398 10. Delivery Stationary Jam Figure 3-454 Sequence of Operations 11. Pick-Up Stationary Jam (cassette unit) Figure 3-453 Sequence of Operations 399 12. Pick-Up Delay Jam (cassette unit) Figure 3-455 Sequence of Operations 3100 13. Pick-Up Delay Jam (Paper Deck Pedestal-K1) Figure 3-457 Figure 3-456 14. Pick-Up Timing Jam (Paper Deck Pedestal-K1) V. POWER SUPPLY Figure 3-501 A. Outline of Power Distribution 3102 B. Power Supply Circuitry 3103 C. Detecting Errors on the Power Supply PCB 3104 D. Protection Mechanisms for the Power Supply Circuit 3105 VI. SERVICE MODE B. Using Service Mode 1. Starting Service Mode 2. Selecting Service Mode Group 3. Selecting an Item under Each Ser- vice Mode 3106 7. Recording on the Service Label 4. Using Adjustment Mode (3) and Machine Settings Mode (5) 5. Using Operation/Inspection Mode (4) 6. Resetting Error Codes (back-up codes) C. Control Display Mode (1) 3108 3109 3110 D. I/O Mode (2) 3111 No. 214, No. 215, No. 216, No. 217, and No. 218 Table 3-609 3112 3113 No. 222 Port P0 Display Table 3-611 3114 E. Adjustment Mode (3) 3115 3116 3117 F. Operation/Inspection Mode (4) 3118 G. Machine Settings Mode (5) 3119 3120 H. Counter Mode (6) 3121 VII.SELF DIAGNOSIS A. Copier Self Diagnosis E000 E001 E002 E003 E004 E010 E030 E041 3122 E064 E202 E210 E220 E240 E260 E712 E717 E710 E261 E802 3123 E901 B. Self Diagnosis on the Cassette Feeding Unit 3124 3125 E400 E402 E401 E403 E404 E411 C. RDF/ADF Self Diagnosis 3126 E500 E530 D. Sorter Self Diagnosis E510 E541 E531 E540 VIII. STANDARDS AND ADJUSTMENTS A. Electrical 1 Adjustment after Replacing PCBs 2 Adjusting the Scanning Lamp Intensity 3 AE Adjustment 3128 3129 3130 q w q w 3131 4 Multifeeder Paper Width Sensor Adjustment 3132 5 Setting the Paper Size for the Universal Cassette 3133 6 Initializing the Back-Up RAM 1-c 7 Checking the Photointerrupters 2-a 1-a 2-f 2-b 2-g 2-e 2-c 2-d Page CHAPTER 4 MECHANICAL SYSTEM Page 41 I. EXTERNALS A. External Covers 42 B. Control Panel 1. Removing the Control Panel C. Removing the Display Panel 43 D. Fan 1. Removing the Exhaust Fan 2. Removing the Scanner cooling fan 44 E. Counter* 1. Installing the Option Counter (CNT2) 45 II. DRIVE SYSTEM Scanner wire A. Scanner Drive System 1. Removing the Scanner Drive Motor 2. Removing the Scanner Cable 46 3. Assembling the Mirror Positioning Tool 47 4. Routing the Scanner Cable 48 Cable spring Cable spring Hook Hook Cable Cable (front) (rear) 49 5. Adjusting the Mirror Position (opti- cal length between No. 1 mirror and No. 2 and No. 3 mirrors) 1 (front) (rear) 1 B. Lens Drive Assembly 1 3 1. Removing the Lens Drive Motor 2 2 411 412 2. Routing the Lens Cable 413 3. Positioning the Change Solenoid 414 C. Main Motor 1. Removing the Main Motor Unit 2. Routing the Drive Belt 415 III. PICK-UP/FEEDING A. Pick-Up Assembly 1. Removing the Pick-Up Roller Unit 2. Removing the Pick-Up Roller 3. Points to Note When Installing the Pick-Up Roller 416 5. Adjusting the Left/Right Registration 4. Removing the Separation Pad 417 B. Multifeeder Assembly 1. Removing the Multifeeder Pick-up Roller Unit 2. Removing the Multifeeder Pick-Up 1 2 418 3. Points to Note When Installing the Multifeeder Pick-Up Roller 4. Removing the Separation Pad 5. Removing the Multifeeder Spring Clutch (front of copier 419 6. Positioning the Multifeeder Assem- bly Paper Guide Plate Cam 420 C. Registration Roller Assem- 130.50.5mm 1. Removing the Registration Clutch 2. Removing the Upper Registration 7. Adjusting the Left/Right Registration 421 3. Removing the Lower Registration 422 D. Feeding Assembly 1. Removing the Feeding Belt 2. Removing the Feeding Fan E. Delivery Assembly 1. Removing the Delivery Roller F. Duplexing Assembly 1. Removing the Duplexing Assembly Inlet Unit 2. Removing the Duplexing Unit 424 G. Cassette Unit 1. Removing the Copier from the Cas- sette Unit 2. Removing the Pick-Up Roller Unit 3. Removing the Pick-Up Roller 425 4. Points to Note When Installing the Pick-Up Roller 5. Removing the Pick-Up Unit 6. Removing the Cassette Motor 426 7. Removing the Pick-Up Clutch 8. Removing the Cassette Driver PCB 9. Removing the Pick-Up Motor (Cas- sette Pedestal-K1) 10.Removing the Pick-Up Clutch (Cas- sette Pedestal-K1; cassettes 3, 4) H. Paper Deck Pedestal-K1 1. Removing the Pedestal Motor Drive Assembly 2. Removing the Paper Deck 428 3. Removing the Lifter Wire 429 11 12 430 5. Removing the Pick-Up Roller 4. Removing the Pick-Up Assembly 431 6. Points to Note 7. Removing the Feeding Roller 432 8. Points to Note 9. Removing the Separation Roller 10.Points to Note 433 11.Adjusting the Pressure of the Sepa- ration Roller 21 12.Position of the Pick-Up Roller Re- leasing Solenoid Butted. IV. EXPOSURE SYSTEM A. Illuminating Assembly 1. Removing the Scanning Lamp/Fluo- rescent Heater 2. Removing the Blank Exposure As- sembly 435 3. Removing the Blank Exposure Lamp A 4. Removing the Blank Shutter Sole- noid 5. Positioning the Blank Shutter Sole- noid 436 6. Routing the Blank Shutter Cable 7. Adjusting the Left/Right Margin Po- sition 8. Installing the Mirror Heater 437 9. Installing the Lens Heater 438 V. CHARGING SYSTEM A. Drum Unit 1. Removing the Drum Unit 2. Cleaning 439 B. Primary Charging Assem- 4 5 1. Removing the Primary Charging Unit 2. Cleaning the Cleaning Pad and the Primary Charging Roller 440 C. Transfer Charging Assem- 1. Removing the Transfer Roller 441 D. Drum Heater* 1. Installing the Drum Heater 442 VI. DEVELOPING SYS- TEM 1. Removing the Developing Assembly 2. Removing the Blade Assembly 443 7 13 12 8 9 10 7 * 445 VII. FIXING SYSTEM 1. Construction 2. Removing the Upper Fixing Unit 446 3. Removing the Fixing Roller 447 4. Points to Note after Replacing the Upper Fixing Unit 448 5. Removing the Lower Fixing Unit 6. Removing the Separation Claw/Fix- ing Cleaning Roller 449 7. Adjusting the Lower Fixing Roller Pressure (nip) 450 B. Composite Power Supply PCB 1. Removing the Composite Power Sup- ply PCB VIII. ELECTRICAL A. DC Controller PCB 1. Removing the DC Controller PCB 2. Points to Note When Replacing the DC Controller C. AE Sensor PCB Page CHAPTER 5 INSTALLATION Page 51 I. SELECTING THE SITE 52 II. UNPACKING AND INSTALLING THE COPIER condensation A. Unpacking and Removing Fixings 53 Spacer Spacer Spacer 54 55 B. Turning On the Copier Service mode switch 56 57 C. Checking the Images and Operations 58 D. Attaching the Drum Unit Knob Drum unit 59 A4 E. Changing the Cassette Size R A3 A4 R A5 510 511 Direct position III. RELOCATING THE COPIER 512 IV. REPLACING THE DRUM UNIT Releasing spacer 513 Service mode switch 514 V. INSTALLING THE CONTROL CARD IV N t 515 VI. CASSETTE HEATER KIT 5 INSTALLATION PROCEDURE 517 B. Installation (to copying machine) 518 519 520 C. Installation (to a Cassette Feeding Module-A2/B2/ Cassette Feeding Unit-K1) 521 522 523 524 VII. CASSETTE HEATER KIT 7 INSTALLATION PRO- CEDURE 525 B. Installation 526 527 C. Attaching the Ratings Label 6 mm 7 mm 528 B. Installation to the Copier VIII.INSTALLING THE RE- MOTE DIAGNOSTIC DEVICE II r e y y 529 y u t 530 !0 !2 !4 !1 531 !5 !7 !6 !8 532 @1 @0 @2 !9 !6 533 !7 @6 @4 @3 Page CHAPTER 6 MAINTENANCE AND SERVICING Page 61 I. PERIODICALLY REPLACED PARTS A. Periodically Replaced Parts 62 II. DURABLES AND CONSUMABLES A. Copier 63 B. Cassette Feeding Module-B2, Cassette Feeding Module-A2, and Cassette Feeding Unit-K1 C. Paper Deck Pedestal-K1 64 III. BASIC SERVICING 65 IV. SERVICING CHART A. Scheduled Maintenance Work Page APPENDIX Page A1 A. GENERAL TIMING CHART A4, 2 copies, DIRECT, cassette 1 A2 B. SIGNALS AND ABBREVIATIONS 1. Signals A3 3. Abbreviations Page Page Page A7 D. DC CONTROLLER CIRCUIT DIAGRAM Q301 DC Controller (1/14) A8 DC Controller (2/14) A9 DC Controller (3/14) Q311 A10 DC Controller (4/14) Q316 A11 DC Controller (5/14) A12 DC Controller (6/14) A13 DC Controller (7/14) A14 DC Controller (8/14) A15 DC Controller (9/14) R542 R543 R544 A16 DC Controller (10/14) Q382 Q381 A17 DC Controller (11/14) A18 DC Controller (12/14) + 84 48 A19 DC Controller (13/14) A20 DC Controller (14/14) A21 E. COMPOSITE POWER SUPPLY CIRCUIT DIAGRAM Composite Power Supply PCB (1/6) 1/6 A22 Composite Power Supply PCB (2/6) A23 Composite Power Supply PCB (3/6) AC+DC BIAS H.V.GENERATOR PRIMARY A24 Composite Power Supply PCB (4/6) DISCHARGE A25 Composite Power Supply PCB (5/6) TRANSFER A26 Composite Power Supply PCB (6/6) A27 F.CONTROL PANEL KEY PCB Control Panel Key PCB (1/3) A28 Control Panel Key PCB (2/3) A29 Control Panel Key PCB (3/3) Page A31 G. AE SENSOR CIRCUIT DIAGRAM A32 H. INTENSITY SENSOR CIRCUIT DIAGRAM A33 I. TONER LEVEL DETECTION CIRCUIT DIAGRAM SENSOR 24VB TNEMP J752 J. CASSETTE FEEDING MODULE-B2 GENERAL CIRCUIT DIAGRAM M MTR-B MTR-A MTR-COM K. CASSETTE FEEDING MODULE-B2 DRIVER CIRCUIT DIAGRAM Driver Circuit Diagram (1/2) A36 Driver Circuit Diagram (2/2) A37 L. CASSETTE FEEDING MODULE-A2 GENERAL CIRCUIT DIAGRAM A38 M. CASSETTE FEEDING MODULE-A2 DRIVER CIRCUIT DIAGRAM Driver Circuit Diagram (1/2) A39 Drivcr Circuit Diagram (2/2) B CON B A Page A41 N. CASSETTE FEEDING UNIT-K1 GENERAL CIRCUIT DIAGRAM Cassette pedestal controller PCB A42 O. CASSETTE FEEDING UNIT-K1 Cassette Feeding Unit-K1 (1/3) A43 Cassette Feeding Unit-K1 (2/3) R135 Q135 Q110 R106 A44 Cassette Feeding Unit-K1 (3/3) A45 P. PAPER DECK PEDESTAL-K1 GENERAL CIRCUIT DIAGRAM Deck Driver A46 Q. PAPER DECK PEDESTAL-K1 DRIVER CIRCUIT DIAGRAM A47 R. SPECIAL TOOLS A48 S. SOLVENTS/OILS