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Canon PC980 Service Manual - Page 115

Controlling the Side Blanking Mechanism, Outline, Operations

UPC - 030275182323

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CHAPTER 4 IMAGE FORMATION SYSTEM G. Controlling the Side Blanking Mechanism 1. Outline The machine is equipped with a side blanking lamp at the front and the rear used to prevent adhesion of excess toner when making reduced copies. 2. Operations To blank out the non-image area in reduce mode, the side blanking lamp is moved in relation to the distance over which the lens moves as detected by the lens shift detecting shaft. Rear side blanking lamp Reflecting plate Lens shift detecting shaft Front side blanking lamp (front) Figure 4-121 Reflecting plate A B B A , , Photosensitive drum Non-image area in Reduce mode A: Position of the side blanking lamp in Direct and Reduce mode B: Position of the side blanking lamp in Reduce mode Figure 4-122 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-21

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