Printer Section: Foggy Background Or Rough Image - Konica Minolta Di1611 Service Manual

TROUBLESHOOTING
4.4.15

Printer Section: Foggy background or rough image

Step
1 The image changes when "ID Adjust" and "VG
Adjust" are executed.
2 PC Drum surface and the areas in contact with
Ds Collars are dirty with foreign matter, or
deformed or worn.
3 Main Erase (LA1) is dirty.
4 Grid bias contact is dirty, scratchy, deformed,
worn, or damaged.
5 ATDC Sensor (UN1) is dirty with foreign matter
(such as paper dust) other than developer.
6 The following voltages develop from the ATDC
Sensor (UN1).
<Check Procedure>
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
7 The following voltage is supplied from the Master
Board (PWB-A).
<Check procedure>
• 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).
Di1611/Di2011 FIELD SERVICE Ver.1.0 Mar. 2004
<Typical Faulty Images>
Check
3-56
4011T004AA
Result Action
YES • Readjust. For details,
see ADJUSTING/
SETTING.
YES • Clean or change.
YES • Clean.
YES • Clean, correct, or
change.
YES • Clean.
NO • Change ATDC Sensor
(UN1) and then
change developer.
YES • Adjust Db. For details,
see ADJUSTING/
SETTING.
• Change Eraser Lamp
(LA1).
• Change PC Drum.
• Change Imaging Unit.
• Change High Voltage
Unit (HV1).
NO • Change Master Board
(copier: PWB-A).