Printer Section: Foggy Background Or Rough Image - Konica Minolta Bizhub 162 Service Manual

Field Service Ver. 1.0 Apr. 2005
17.2.15

Printer Section: Foggy background or rough image

A. Typical Faulty Images
B. Troubleshooting Procedure
Step
The image changes when "ID Adjust" and "VG Adjust"
1
are executed.
PC Drum surface and the areas in contact with Ds Col-
2
lars are dirty with foreign matter, or deformed or worn.
3 Main Erase (LA1) is dirty.
Grid bias contact is dirty, scratchy, deformed, worn, or
4
damaged.
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
The following voltage is supplied from the Master Board
(PWB-A).
<Check procedure>
7
• Check that there is 24 V developing across the Master
Board pin and GND when the Power Switch is turned
ON (during a copy cycle or a standby state).
Check
17. Image quality problem
4011T004AA
Result Action
• Readjust. For details, see
YES
ADJUSTING/SETTING.
YES • Clean or change.
YES • Clean.
• Clean, correct, or
YES
change.
YES • Clean.
• Change ATDC Sensor
NO (UN1) and then change
developer.
• Adjust Db. For details,
see ADJUSTING/SET-
TING.
• Change Eraser Lamp
YES (LA1).
• Change PC Drum.
• Change Imaging Unit.
• Change High Voltage
Unit (HV1).
• Change Master Board
NO
(copier: PWB-A).
169