Canon NP7161 C. Protection Mechanisms of the Power Supply Circuitry

COPYRIGHT

©

1998 CANON INC. CANON NP7160/NP7161 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)

7–7

CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS

C. Protection Mechanisms of the Power Supply Circuitry

The copier’s power supply PCB is equipped with a circuit breaker (CB1, CB2) and a fuse

(FU1, FU2) on its AC input side. To protect against overcurrent and over voltage, the copier is

also equipped with an overcurrent protection circuit and an over-voltage protection circuit.

When an overcurrent or an over-voltage occurs as a result of a short circuit in the power line,

the respective protection mechanism will turn on to stop the output of the power supply PCB.

When the output is stopped, disconnect the copier’s power plug, and turn off the AC power

to the power supply PCB to reset the protection mechanism.

Caution:

Be sure to correct the cause that turned on the protection circuit before resetting.

Repeated short-circuiting and resetting can cause the fuse built into the power supply

PCB to melt.

Contents

Main Page Page Page INTRODUCTION Page Page Page v CONTENTS CHAPTER 1 GENERAL DESCRIPTION CHAPTER 2 BASIC OPERATION vi CHAPTER 3 EXPOSURE SYSTEM CHAPTER 4 IMAGE FORMATION SYSTEM vii CHAPTER 5 PICK-UP/FEEDING SYSTEM viii CHAPTER 6 FIXING SYSTEM CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS ix CHAPTER 8 INSTALLATION CHAPTER 9 MAINTENANCE AND SERVICING CHAPTER 10 TROUBLESHOOTING x xi APPENDIX Page CHAPTER 1 GENERAL DESCRIPTION Page I. FEATURES II. SPECIFICATIONS Page 14 15 4. Others Specifications subject to change without notice. Page Page 18 III. NAMES OF PARTS Figure 1-302 A. External View Figure 1-301 19 B. Cross Section Figure 1-303 1. Copier 110 CHAPTER 1 GENERAL DESCRIPTION IV. OPERATING THE MACHINE A. Control Panel Figure 1-401 111 Table 1-402 B. User Mode U00 U01 U02 U03 U04 U05 U06 U07 U08 113 U09 U10 U11 U12 U13 U14* V. ROUTINE MAINTENANCE (BY THE USER) VI. POINTS TO NOTE (BY THE USER) 116 CHAPTER 1 GENERAL DESCRIPTION Figure 1-701 VII.IMAGE FORMATION The copier is constructed as shown in Figure 1-701. Page Page CHAPTER 2 BASIC OPERATION Process speed 105 mm/s Page 21 I. BASIC MECHANISMS Figure 2-101 A. Functional Construction B. Outline of the Electrical Circuitry 23 Figure 2-102 24 C. Basic Sequence of Operations Figure 2-103 1. Basic Sequence of Operations at Power-On 25 Table 2-101 26 2. Basic Sequence of Operations at Copy Start Figure 2-104 27 Table 2-102 image to the photosensitive D. Main Motor (M1) Control Circuitry 29 E. Inputs to the DC Controller Figure 2-106 1. Inputs to the DC Controller (1/3) 210 2. Inputs to the DC Controller (2/3) Figure 2-107 211 3. Inputs to the DC Controller (3/3) Figure 2-108 212 F. Outputs from the DC Controller Figure 2-109 1. Outputs from the DC Controller (1/4) 213 2. Outputs from the DC Controller (2/4) Figure 2-110 214 3. Outputs from the DC Controller (3/4) Figure 2-111 215 4. Outputs from the DC Controller (4/4) Figure 2-112 216 G. Inputs to and Outputs from Accessories (1/1) AS_TXD ST-TXD ST-RXD DF-TXD CHAPTER 3 EXPOSURE SYSTEM Page A. Changing the Reproduction Ratio Page II. LENS DRIVE SYSTEM A. Driving the Lens 34 CHAPTER 3 EXPOSURE SYSTEM Figure 3-202 Page III. SCANNER DRIVE SYSTEM 37 B. Scanner Motor Control Circuit Table 3-301 Figure 3-302 C. Relationship between Scanner Sensor and Signals D. Basic Sequence of Operations (scanner) E. Scanner Movement in Page Separation Mode IV. OTHERS A. Detecting the Original Size V. DISASSEMBLY/ASSEMBLY A. Scanner Drive Assembly Page Page Page Page Page B. Lens Drive Assembly Page Page CHAPTER 4 IMAGE FORMATION SYSTEM Page I. OUTLINE OF THE PROCESSES 42 B. Basic Sequence of Operations (image formation system) Figure 4-102 43 CHAPTER 4 IMAGE FORMATION SYSTEM Figure 4-103 C. Controlling the Intensity of the Scanning Lamp Page Page D. Controlling the Primary/Transfer Bias E. Controlling the Developing/Separation Static Eliminator Bias Page Page Page 411 Table 4-102 F. Controlling the Blank Exposure Lamp Page II. DEVELOPING ASSEMBLY/DRUM CLEANER ASSEMBLY Page B. Detecting and Controlling the Level of Toner C. Monitoring the Waste Toner Feeding Screw D. Monitoring the Waste Toner Box Page E. Control by the Cleaner Thermistor F. Auto Density Adjustment (AE) Page III. DISASSEMBLY/ASSEMBLY A. Scanning Lamp Assembly Page B. Exposure Assembly Page C. Drum Unit Page D. Primary Charging E. Transfer Charging F. Charging Wire Page Page Page Page G. Developing Assembly Page Page Page CHAPTER 5 PICK-UP/FEEDING SYSTEM Page Page II. PICK-UP FROM THE CASSETTE A. Pick-Up Operation 53 B. Sequence of Operations (pick-up/feeding) Figure 5-202 A4, 2 Copies C. Operation of the Cassette Lifter Page D. Detecting the Size of the Cassette Page III. PICK-UP FROM THE MULTIFEEDER A. Pick-Up Operation B. Detecting the Size of Paper in the Multifeeder 510 C. Sequence of Operations (pick-up from multifeeder) Figure 5-303 A4, 2 Copies IV. CONTROLLING THE REGISTRATION CLUTCH V. DETECTING JAMS 513 B. Sequence of Operations (jam detection) Figure 5-503 1. Registration Delay Jam Figure 5-502 2. Registration Stationary Jam 514 3. Delivery Delay Jam Figure 5-505 Figure 5-504 4. Delivery Stationary Jam VI. DISASSEMBLY/ASSEMBLY A. Pick-Up Assembly Page Page Page B. Multifeeder Assembly Page Page C. Registration Roller D. Cassette Assembly Page Page CHAPTER 6 FIXING SYSTEM Page Page CHAPTER 6 FIXING SYSTEM 62 B. Controlling the Fixing Temperature Table 6-103 Table 6-101 257 mm > Paper Width > 216 mm Table 6-102 216 mm > Paper Width > 182 mm 63 182 mm > Paper Width Figure 6-102 Table 6-104 From Power-On to End of Copying 64 Power Save Key ON or Auto-Power OFF Figure 6-103 65 C. Error Detection Circuit Figure 6-104 Page II. DISASSEMBLY/ASSEMBLY A. Fixing Assembly Page Page Page Page Page Page Page B. Delivery Assembly Page Page CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS Page I. FANS Page Page CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS 1998 CANON INC. CANON NP7160/NP7161 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) COPYRIGHT 74 II. POWER SUPPLY Power supply PCB Figure 7-201 A. Outline of Power Supply Figure 7-201 is a block diagram showing distribution of power inside the machine. B. Power Supply Circuitry Page C. Protection Mechanisms of the Power Supply Circuitry III. DISASSEMBLY/ASSEMBLY A. External Covers Page Page Page B. Control Panel C. Copyboard Glass D. Fans Page Page E. Counter Assembly F. Main Motor Assembly G. DC Controller PCB H. Removing the Power Supply PCB I. Removing the High-Voltage Power Supply PCB J. Lamp Regulator PCB Page CHAPTER 8 INSTALLATION Page I. SELECTING THE SITE II. UNPACKING AND INSTALLATION A. Unpacking B. Removing the Metal Fixings C. Mounting the Drum Unit Page D. Cleaning the Parts and Making Checks Page E. Checking the Images/Operations and User Mode Page F. Supplying Toner Page III. RELOCATING THE MACHINE IV. INST ALLING THE CONTROL CARD IV N V. INSTALLING THE REMOTE DIAGNOSTIC DEVICE II Page Page Page CHAPTER 8 INSTALLATION 818 [16] Figure 8-511 Table 8-502 [18] 819 CHAPTER 8 INSTALLATION Figure 8-513 [20] [18] Page Page Page VI. INSTALLING THE ACCESSORY COUNTER Page VII.INSTALLING THE ACCESSORY HEATER A. Installing the Heater Switch B. Mounting the Cassette/ Drum Heater C. Installing the Mirror Heater Page Page Page I. PERIODICALLY REPLACED PARTS A. Copier II. CONSUMABLES AND DURABLES 93 III. SCHEDULED SERVICING CHART 94 95 IV. SCHEDULED SERVICING TABLE CHAPTER 9 MAINTENANCE AND SERVICING 96 CHAPTER 10 TROUBLESHOOTING Page I. GUIDE TO TROUBLESHOOTING TABLES 102 The instruction Measure the voltage between J109-1 (+) and J109-2 (-) on the DC 103 Pre-Checks Density Slope Adjustment Solid Black Density Adjustment Optimum Exposure Adjustment A. Image Adjustment Basic Procedure Non-AE, Copy Density at 5 104 B. Points to Note for Scheduled Servicing II. STANDARDS AND ADJUSTMENTS A. Mechanical Page B. Exposure System Page Page C. Image Formation System Page Page Page D. Pick-Up/Feeding System Page E. Fixing System Page F. Electrical System Page Page Page Page Page 1024 III. IMAGE FAULTS A. Initial Checks Page Page Page 1029 C. Troubleshooting Image Faults 1. The copy is too light. (halftone area only) 1030 1031 4. The copy has uneven density. (front side dark) 5. The copy has uneven density. (front side light) 1032 6. The copy is foggy. (overall) 1033 7. The copy is foggy. (vertical) 8. The copy has black lines. (vertical, fuzzy, thick) 9. The copy has black lines. (vertical, thin) 1034 10.The copy has white spots. (vertical) 11.The copy has white lines. (vertical) 1035 12.The copy has white spots. (vertical) 1036 13.The back of the copy is soiled. 1037 14.The copy has faulty fixing. 1038 15. 16.The copy has a displaced leading edge. 17. 1039 18.The copy has a blurred image. 19.The copy is foggy. (horizontally) 1040 20.The copy has poor sharpness. 1041 21.The copy is blank. 22.The copy is solid black. 1042 IV. TROUBLESHOOTING MALFUNCTIONS 1. E000 1043 2. E001 1044 3. E002/E003 1045 4. E004 5. E010 1046 6. E013 7. E030 1047 8. E031 9. E202 (The keys on the control panel fail to operate.) 1048 10.E208 11.E210 1049 12.E220 13.E261 14.E710/E711 1050 15.E712 16.E717 1051 17.E800 19.E821 18.E805 1052 20.AC power is absent. 1053 21.DC power supply is absent. 1054 22.The scanner fails to move. 1055 23.The lens fails to move. 24.The mirror fails to move. 1056 25.The scanning lamp fails to turn on. 1057 26.The pre-exposure lamp fails to turn on. 27.The blank exposure lamp fails to turn on. 1058 28.Pick-up fails. (cassette) 1059 29.Pick-up operation fails. (multifeeder) 30.The registration roller fails to rotate. 1060 31.The fixing heater fails to turn on. 32.The Add Toner indicator does not flash/turn on. 1061 33.The Add Toner indicator fails to turn off. 34.The Waste Toner Box Full indicator fails to flash/turn on. 1062 35.The Waste Toner Box Full indicator fails to turn off. 36.The Add Paper indicator fails to flash. 1063 37.The Add Paper indicator fails to turn off. 38.The Jam indicator fails to flash. 1064 39.The Jam indicator fails to turn off. 40.The Set Control Card indicator fails to turn on. 1065 41.The Set Control Card indicator fails to turn off. V. TROUBLESHOOTING FEEDING PROBLEMS A. Copy Jams 1067 1. Pick-Up/Feeding Assembly 1068 2. Fixing/Delivery Assembly 1069 B. Faulty Feeding 1. Double Feeding 2. Wrinkles 1070 VI. ARRANGEMENT AND FUNCTIONS OF ELECTRICAL PARTS Figure 10-601 A. Sensors and Switches 1071 Table 10-601 1072 Figure 10-602 B. Motors, Fans, Clutches, and Solenoids 1073 M Table 10-602 1074 Figure 10-603 C. Heaters, Lamps, and Others 1075 CNT Table 10-603 1076 D. PCBs Table 10-604 Figure 10-604 1077 E. Variable Resistors, Light-Emitting Diodes, and Check Pins by PCB Figure 10-605 1078 Table 10-605 Table 10-606 Table 10-607 1079 Table 10-608 Table 10-609 1080 2. Power Supply PCB 3. Lamp Regulator PCB Figure 10-607 Figure 10-606 1081 4. High-Voltage Power Supply PCB Figure 10-608 VII. SERVICE MODE B. Using Service Mode C. Using Adjust Mode and Function Mode 1084 D. Display Mode [1] 1085 Table 10-702 Page 1087 Guide to Sorter Tray Warning (No. 122) Table 10-708 Table 10-706 Overstacking DescriptionCode E. I/O Display Mode [2] 1089 Guide to Nos. 202, 203, 204, 205, 219, 220, 222, and 223 Table 10-709a Figure 10-702 1090 Table 10-709b 1091 Table 10-709c 1092 F. Adjust Mode [3] 1093 1094 G. Function Mode [4] To stop an item, use the Stop key. To clear an item, use the Clear key. Be sure that the copier is in standby state when executing any item. 1095 H. Option Mode [5] 1096 Paper Sizes Available under No. 505/506 Table 10-710 I. Counter Mode [6] J. Application Mode [7] 1099 VIII. SELF DIAGNOSIS E003 E004 E000 E001 E002 E010 E030 E220 10100 E013 E031 (E202) E710 E805 E711 E712 E717 E800 E821 Page 10103 B. ADF E400 E401 E402 E403 E404 E431 E411 Page Page Page A1 A. GENERAL TIMING CHART A2 B. SIGNALS AND ABBREVIATIONS 1. Signals Page Page C. GENERAL CIRCUIT DIAGRAM A5 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) COPYRIGHT 87654321 Page A7 D. SPECIAL TOOLS LIST APPENDIX A8 E. SOLVENTS AND OILS