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COPYRIGHT© 2001 CANON INC.
2000 2000 2000 2000
CANON iR8500 REV.0 MAR. 2001
CHAPTER 6 TROUBLESHOOTING
6-55
REF.
In a zero-level check, a check is made to find out whether the microproces-
sor indicates 0 V when the drum surface potential is 0 V.
Using a zero-level check, the microprocessor on the DC control PCB and the measure-
ment unit may be checked.
In method 1, the condition of the level shift circuit on the DC controller PCB may be
checked while in method 2 the potential control circuit may be checked.
1. Method 1
1) Turn off the power switch.
2) Short J522-1 and -2 on the DC controller PCB with a jumper wire, and disconnect
connector J3 of the potential control PCB.
Chap_06_4.p65
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Summary of Contents for ImageRunner iR8500 Series
Page 492: ...COPYRIGHT 2001 CANON INC 2000 2000 2000 2000 CANON iR8500 REV 0 MAR 2001 APPENDIX ...
Page 497: ...Service Mode COPYRIGHT 2001 CANON INC 2000 CANON iR8500 REV 0 MAR 2001 ...
Page 620: ...Error Code COPYRIGHT 2001 CANON INC 2000 CANON iR8500 REV 0 MAR 2001 ...
Page 655: ...PRINTED IN U S A 0301AB0 76 0 This publication is printed on 100 recycled paper ...