Konica Minolta BIZHUB 163 Service Manual page 232

Field Service Ver. 1.0 Apr. 2007
16.2.22 Printer section: Gradation reproduction failure
A. Typical faulty images
B. Troubleshooting Procedure
Step
1 PC drum is dirty.
Image transfer roller is dirty, scratchy, deformed, worn, or
2
damaged.
3 The PH unit cable is loose.
4 PH window of PH unit is dirty.
TCR sensor (TCRS) is dirty with foreign matter (such as
5
paper dust) other than developer.
The following voltages develop from the TCR sensor
(TCRS).
<Check procedure>
6 Check voltage across a printer control board pin and GND
when the power switch is turned ON.
• DC5.39 V to 8.15 V across PJ10A-1 and GND
• DC1.41 V to 4.98 V across PJ10A-3 and GND
Check
16. Image quality problem
A09AF3C530DA
Result Action
YES • Clean.
YES • Clean or change.
YES • Reconnect.
YES • Clean.
YES • Clean.
• Change TCR sensor
NO
(TCRS) and developer.
• Change printer control
YES
board (PRCB).
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