Scanner System: Black Streaks Or Bands - Konica Minolta bizhub 250 Service Manual

21. Image quality problem
21.3.4

Scanner System: Black streaks or bands

A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section
1 Original
2 Original Cover
3
4 Shading Sheet
5 Mirrors/Lens/
Original Glass/
Reflectors
6 Exposure Lamp
7 BCRS Board
8 PWBs and Con-
nection Cables
9 MFBS Board
10
11 CCD Unit
12
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EDNord - Istedgade 37A - 9000 Aalborg - telefon 96333500
4036fs4023c0
Check Item
Original is damaged or dirty.
Original Pad is dirty.
Original Cover does not lie flat.
Shading sheet is dirty.
Mirrors, lens, Original Glass and/or
reflectors are dirty.
Exposure Lamp is dirty.
The problem has been eliminated after
performing step 6.
Connectors are securely connected with
no bent pins and no breaks in the con-
nection cables.
Connectors on the MFBS Board are
connected properly.
The problem has been eliminated after
performing step 9.
Connectors on the CCD Unit Board are
connected properly.
The problem has been eliminated after
performing step 11.
Field Service Ver. 1.0 Aug. 2005
4036fs4024c0
Result Action
YES Change original.
YES Clean.
YES Replace Original Cover if
it is deformed or the
hinges are broken.
YES Clean.
YES Clean.
YES Clean.
Change Exposure Lamp.
NO Change the Jumper
Switch Setting on the
BCRS Board.
218
NO Reconnect.
Replace the connection
cable.
NO Reconnect.
NO Change MFBS Board.
NO Reconnect.
NO Change CCD Unit.