Scanner System: Abnormal Image - Konica Minolta bizhub C650 Service Manual

18. Image quality problem
18.3.13

Scanner system: abnormal image

A. Typical faulty images
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B. Troubleshooting procedure
Step Section
Cable connecting
1 scanner and
printer
Image process-
2
ing board (IPB)
MFP board
3
(MFPB)
Test Mode
4 [Service Mode]
Image process-
5 ing board (IPB)
Printer control
board (PRCB)
6
PH relay board
(REYB/PH)
MFP board
7
(MFPB)
706
ABCDE
ABCDE
ABCDE
ABCDE
ABCDE
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Check item
Connector is connected properly
with no pins bent.
Connectors on the image process-
ing board are connected properly.
Data on previous page is mixed
with data on current page.
The problem is eliminated as
checked with the image on a test
pattern produced.
The problem is eliminated after the
interface connection cable has
been changed.
Check the connection of connec-
tors, harness, and flat cables
between PRCB and REYB/PH, and
correct if necessary.
The problem has been eliminated
through the checks of steps up to 6.
Field Service Ver. 8.0 Jun. 2008
ABCDE
Data on previous page
ABCDE
ABCDE
AA
Data on current page
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Result
NO Reconnect.
NO Reconnect.
NO Reinstall the memory.
NO Change interface connection
cable.
NO Change image processing
board.
NO Change printer control board.
Change PH relay board.
NO Change MFP board.
Action