Printer Section: Gradation Reproduction Failure - Konica Minolta Bizhub 162 Service Manual

17. Image quality problem
17.2.22

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.
ATDC Sensor (UN1) is dirty with foreign matter (such as
5
paper dust) other than developer.
The following voltages develop from the ATDC Sensor
(UN1).
<Check Procedure>
6 Check voltage across a Master 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
176
Check
Field Service Ver. 1.0 Apr. 2005
4011T526AA
Result
YES • Clean.
YES • Clean or change.
YES • Reconnect.
YES • Clean.
YES • Clean.
• Change ATDC Sensor
NO
(UN1) and developer.
• Change Master Board
YES
(copier: PWB-A).
Action