Konica Minolta bizhub C250 Service Manual page 489

16. Malfunction code
16.5.10 C2451: Transfer Cleaner Unit New Article Release
Mechanical Control Board (PWB-M)
Step
1 Reinstall Unit
2 Change PWB-M
16.5.11 C2551: Abnormally low toner density detected Cyan TCR Sensor
16.5.12 C2553: Abnormally low toner density detected Magenta TCR Sensor
16.5.13 C2555: Abnormally low toner density detected Yellow TCR Sensor
Imaging Unit /C
Imaging Unit /M
Imaging Unit /Y
Toner Supply Motor C/K (M6)
Toner Supply Motor Y/M (M7)
Step
Perform image troubleshooting procedure if
1
image density is low.
Clean the TCR Sensor window on the
2
underside of the Imaging Unit if dirty
M6, M7 operation check
3
4 Reinstall Imaging Unit
5 Change Imaging Unit
6 Change PWB-M
7 Change PWB-MFP.
446
Relevant Electrical Parts
Action
Relevant Electrical Parts
Action
Field Service Ver. 3.0 Aug. 2006
WIRING DIAGRAM
Control Signal
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Mechanical Control Board (PWB-M)
MFP Control Board (PWB-MFP)
WIRING DIAGRAM
Control Signal
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PWB-M CNDM2-10 to 13 (M6)
PWB-M CNDM3-10 to 13 (M7)
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Location (Electri-
cal Component)
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Location (Electri-
cal Component)
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C-20
C-21
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