Printer Section: Gradation Reproduction Failure - Konica Minolta Di1611 Service Manual

Di1611/Di2011 FIELD SERVICE Ver.1.0 Mar. 2004
4.4.22

Printer Section: Gradation reproduction failure

Step
1 PC Drum is dirty.
2 Image Transfer Roller is dirty, scratchy, deformed,
worn, or damaged.
3 The PH Unit cable is loose.
4 PH window of PH Unit is dirty.
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
<Typical Faulty Images>
Check
3-63
TROUBLESHOOTING
4011T526AA
Result Action
YES • Clean.
YES • Clean or change.
YES • Reconnect.
YES • Clean.
YES • Clean.
NO • Change ATDC Sen-
sor (UN1) and
developer.
YES • Change Master
Board (copier: PWB-
A).