16. Image quality problem
Field Service Ver. 1.0 Apr. 2007
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T
roubleshooting
16.2.13
Printer section: Black copy
A. Typical faulty images
B. Troubleshooting Procedure
A09AF3C523DA
Step
Check
Result
Action
1
PC drum charge corona grid mesh and comb electrode
are loose.
YES
• Reinstall.
2
PC drum charge corona contact is dirty, scratchy, folded,
bent, or damaged.
YES
• Correct or change.
3
Grid bias contact is dirty, folded, or bent.
YES
• Clean, correct, or
change.
4
PC drum ground contact is dirty, scratchy, bent, or dam-
aged.
YES
• Clean, correct, or
change.
5
High voltage unit (HV1) connectors is loose.
YES
• Reconnect.
6
The PH unit cable is loose.
YES
• Reconnect.
7
The following voltage is supplied from the printer control
board (PRCB).
<Check procedure>
Check that there is 24 V developing across the printer con-
trol board pin and GND when the power switch is turned
ON (during a copy cycle or a standby state).
YES
• Change IU.
• Change PH unit.
• Change high voltage
unit (HV1).
NO
• Change printer control
board (PRCB).
Содержание bizhub 163
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