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Detecting an Error on the Composite Power Supply PCB, Protecting the Power Supply Circuit

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CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS C. Detecting an Error on the Composite Power Supply PCB The machine's composite power supply PCB is equipped with a self diagnostic function to check each power output and the communication with the DC controller PCB using the microprocessor (Q900) mounted on it. If any of the following errors occurs, the microprocessor will exchange signals with the DC controller PCB, and will indicate the result of self diagnosis on the control panel. 1. Detecting an Over-Current in the Low-Voltage System If an over-current is detected because of a fault in a DC load, the composite power supply PCB will turn off the relay (RL601) to cut the AC input. 2. Detecting a Fault in the High-Voltage Control Value If a deviation is found between the setting value and the actual value is detected in any of the following voltages, the composite power supply will indicate 'E064' on the control panel. • Primary charging DC bias • Developing DC bias • Transfer bias 3. Detecting a Fault in the Low-Voltage Control Value If a deviation is detected between the setting value and the actual control value in +24 V (DC output), the composite power supply PCB will indicate 'E803' on the control panel. 4. Fault in the Communication with the DC Controller If the DC controller PCB detects a fault in the communication with the composite power supply PCB, 'E240' will be indicated on the control panel for about 4 sec, and then the relay (RL601) will be turned off to cut the AC input. D. Protecting the Power Supply Circuit The composite power supply PCB is equipped with an over-current detection function which turns on a protective mechanism to stop output if a load suffers a short-circuit. If the output has stopped, it may be reset by opening the machine's top unit, correcting the load, and then turning the power switch back on. Keep in mind, however, that repeated short-circuiting and resetting can blow the fuse (FU102). 7-6 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

Section	Page
PC800s/900s SERVICE MANUAL	1
CONTENTS	7
CHAPTER 1	11
I. FEATURES	13
II. SPECIFICATIONS	14
III. NAMES OF PARTS	22
IV. USING THE MACHINE	27
V. ROUTINE MAINTENANCE BY THE USER	29
VI. IMAGE FORMATION	32
CHAPTER 2	35
I. BASIC OPERATIONS	37
CHAPTER 3	49
I. OPERATIONS	51
II. EXPOSURE SYSTEM	59
III. DISASSEMBLY/ASSEMBLY	62
CHAPTER 4	93
I. IMAGE FORMATION SYSTEM	95
II. DISASSEMBLY/ASSEMBLY	116
CHAPTER 5	123
I. PICKUP/FEEDING SYSTEM	125
II. DISASSEMBLY/ASSEMBLY	142
CHAPTER 6	163
I. OPERATIONS	165
II. DISASSEMBLY/ASSEMBLY	174
CHAPTER 7	179
I. FANS	181
II. POWER SUPPLY SYSTEM	183
III. DISASSEMBLY/ASSEMBLY	187
CHAPTER 8	205
I. ADF	207
II. DISASSEMBLY/ASSEMBLY	224
CHAPTER 9	241
I. SELECTING A SITE	243
II. UNPACKING AND INSTALLATION	244
III. MOVING THE MACHINE	254
CHAPTER 10	257
I. PERIODICALLY REPLACED PARTS	258
II. DURABLES AND CONSUMABLES	258
III. SCHEDULED SERVICING	258
IV. STORING AND HANDLING THE CARTRIDGE	259
CHAPTER 11	264
I. MAINTENANCE AND INSPECTION	268
II. STANDARDS AND ADJUSTMENTS	270
III. TROUBLESHOOTING IMAGE FAULTS	313
IV. TROUBLESHOOTING MALFUNCTIONS	326
V. TROUBLESHOOTING FEEDING PROBLEMS	340
VI. ARRANGEMENT AND FUNCTIONS OF ELECTRICAL PARTS	344
VII. SELF DIAGNOSIS	351
APPENDIX	354
A. GENERAL TIMING CHART	356
B. SIGNALS AND ABBREVIATIONS	358
C. GENERAL CIRCUIT DIAGRAM	360
D. DC CONTROLLER CIRCUIT DIAGRAM	362
E. ADF CONTROLLER CIRCUIT DIAGRAM	370
F. COMPOSITE POWER SUPPLY CIRCUIT DIAGRAM	374
G. CONTROL PANEL CIRCUIT DIAGRAM	382
H. AE SENSOR CIRCUIT DIAGRAM	384
I. SENSOR CIRCUIT DIAGRAM	385
J. NOISE FILTER CIRCUIT DIAGRAM	386
K. HIGH VOLTAGE CONTACT CIRCUIT DIAGRAM	387
L. BLANK EXPOSURE (front) CIRCUIT DIAGRAM	388
M. BLANK EXPOSURE (rear) CIRCUIT DIAGRAM	389
N. SPECIAL TOOLS	390

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CHAPTER 7

EXTERNALS/AUXILIARY MECHANISMS

1999

CANON INC.

CANON

PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

7-6

Detecting an Error on the Composite Power Supply PCB

The machine’s composite power supply PCB is equipped with a self diagnostic function to

check each power output and the communication with the DC controller PCB using the micropro-

cessor (Q900) mounted on it.

If any of the following errors occurs, the microprocessor will exchange signals with the DC

controller PCB, and will indicate the result of self diagnosis on the control panel.

Detecting an Over-Current in the Low-Voltage System

If an over-current is detected because of a fault in a DC load, the composite power supply PCB

will turn off the relay (RL601) to cut the AC input.

Detecting a Fault in the High-Voltage Control Value

If a deviation is found between the setting value and the actual value is detected in any of the

following voltages, the composite power supply will indicate ‘E064’ on the control panel.

• Primary charging DC bias

• Developing DC bias

• Transfer bias

Detecting a Fault in the Low-Voltage Control Value

If a deviation is detected between the setting value and the actual control value in +24 V (DC

output), the composite power supply PCB will indicate ‘E803’ on the control panel.

Fault in the Communication with the DC Controller

If the DC controller PCB detects a fault in the communication with the composite power sup-

ply PCB, ‘E240’ will be indicated on the control panel for about 4 sec, and then the relay (RL601)

will be turned off to cut the AC input.

Protecting the Power Supply Circuit

The composite power supply PCB is equipped with an over-current detection function which

turns on a protective mechanism to stop output if a load suffers a short-circuit.

If the output has stopped, it may be reset by opening the machine’s top unit, correcting the load,

and then turning the power switch back on.

Keep in mind, however, that repeated short-circuiting and resetting can blow the fuse (FU102).