Service Call Tables
SM 4-5 D014/D015/D078/D079
Trouble-
shooting
Black level detection error
SC141 D
During AGC the value for black level
was not within ±3 of the prescribed
value.
SBU defective
Harness defective
Check harnesses between
SBU and IPU
IPU defective
VBCU defective
White level detection error
SC142 D
During AGC the value for
white level was not within -7 of
the prescribed value.
Exposure lamp defective
Harness disconnected, damaged
Dirty exposure glass, optics
Scanner motor, drive assembly
defective
SBU board defective
SBU Auto Adjust Error
SC143 C
At power on the automatic
white level adjustment
failed.
Clean the white plate
Clean the optics and lenses
Check the connectors between the
SBU and IPU.
Replace the SBU
Replace the IPU
Replace the VBCU
Replace the exposure lamp
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