Zero Level Check; Method 1 - Canon iR5000 Service Manual

CHAPTER 3 STANDARDS AND ADJUSTMENTS

8.3 Zero Level Check

A "zero level check" is a check made to find out whether the control system of the DC
controller PCB identifies 0 V when the drum surface potential is 0 V.
A zero level check may be made in either of two ways, so as to find out whether a circuit
on the the DC controller PCB or the potential measurement circuit is normal:

1) Method 1:

for checking the level shift circuit of the DC controller PCB
2) Method 2: for checking the potential measurement circuit
8.3.1 Method 1
1) Turn off the main power switch.
2) Remove the rear upper cover.
3) Short CP106 [1] and CP105 [2] on the DC controller PCB using a cable whose both
ends are equipped with an alligator clip or a probe.
When shorting CP106 and CP105, be sure to keep the shorting tool away
from other elements or the pattern on the PCB.
CP101
[2]
CP105
3-30 T
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J117
J116 J120
J121
CP109
J201
CP108
J107 J112 J104
F03-803-01
COPYRIGHT © 2000 CANON INC.
J123
J302
J114
CP104
CP103
CP106
CP111
CP110
CP107
J115 J102
J105
2000 2000 2000 2000 CANON iR5000/iR6000 REV.0 JULY 2000
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