Konica Minolta BIZHUB 163 Service Manual page 223

16. Image quality problem
16.2.13 Printer section: Black copy
A. Typical faulty images
B. Troubleshooting Procedure
Step
PC drum charge corona grid mesh and comb electrode
1
are loose.
PC drum charge corona contact is dirty, scratchy, folded,
2
bent, or damaged.
3 Grid bias contact is dirty, folded, or bent.
PC drum ground contact is dirty, scratchy, bent, or dam-
4
aged.
5 High voltage unit (HV1) connectors is loose.
6 The PH unit cable is loose.
The following voltage is supplied from the printer control
board (PRCB).
<Check procedure>
7
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).
188
Check
Field Service Ver. 1.0 Apr. 2007
A09AF3C523DA
Result Action
YES • Reinstall.
YES • Correct or change.
• Clean, correct, or
YES
change.
• Clean, correct, or
YES
change.
YES • Reconnect.
YES • Reconnect.
• Change IU.
• Change PH unit.
YES
• Change high voltage
unit (HV1).
• Change printer control
NO
board (PRCB).