Printer System: Blank Copy Or Black Copy - Konica Minolta bizhub 250 Service Manual

21. Image quality problem
21.3.8

Printer System: Blank copy or black copy

A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section
1 Imaging Unit
2
3
4 PH Unit
5 PWBs
6 -
260
EDNord - Istedgade 37A - 9000 Aalborg - telefon 96333500
Blank copy
4036fs4038c0
Check Item
Developing Unit drive is being transmit-
ted.
Image transfer current contact terminal
is dirty or deformed.
Developing bias contact terminal is dirty
or deformed.
PH Shutter (shutter in the path of the
laser beam from the PH Unit to the
Photo Conductor) opens and closes
properly.
Connectors are securely connected with
no bent pins on the Mechanical Control
Board or PH Unit.
The problem has been eliminated after
performing step 5.
Field Service Ver. 1.0 Aug. 2005
Black copy
4036fs4039c0
Result
NO Correct or change drive
coupling mechanism.
YES Clean.
Change Photo Conductor
Unit.
YES Clean.
Change Photo Conductor
Unit.
NO Correct.
NO Correct.
NO Change Photo Conductor
Unit.
Change PH Unit.
Change High Voltage
Unit.
Change Mechanical Con-
trol Board.
Action