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CHAPTER 13 TROUBLESHOOTING
13-46
COPYRIGHT
©
1999 CANON INC. CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
Figure 13-G202
J522
Connector (J3)
c. Zero-Level Check
A "zero level check" may be used as a means to find out the condition of the surface potential
control circuit.
Reference:
A zero-level check is to find out whether a microprocessor is reading 0 V when the surface
potential of the drum is 0 V.
A zero-level check enables a check on the microprocessor on the DC controller PCB and the
measuring unit, and it may be either of the following two ways; method 1 enables a check on the
level shift circuit on the DC controller PCB, while method 2 enables a check on the potential
measurement circuit:
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 the connec-
tor J3 of the potential control PCB.