B064 SERIES SERVICE MODE
SM 4-13 B064 Series/B140 Series/G126
Trouble-
shooting
SC No. Symptom Possible Cause
Scanner home position error 4 123 D
The scanner home position sensor
does not detect the off condition
during original scanning.
• BCU, SDRB (Scanner Driver Board)
defective.
• Scanner motor defective.
• Harness between BCU, SDRB, scanner
motor disconnected.
• Scanner HP sensor defective.
• Harness between scanner HP sensor
and BCU disconnected.
• Scanner wire, timing belt, pulley, carriage
installation incorrect.
SBU auto adjust error 143 D
Automatic adjustment of the SBU
fails when the machine is switched
on.
• Exposure lamp defective.
• Exposure lamp regulator defective.
• Harness between exposure lamp and
lamp regulator is disconnected.
• White plate installed incorrectly or is
dirty.
• Scanning mirrors of the exposure unit are
dirty or out of position.
• SBU board defective.
• VIB board defective.
• Harness between SBU, VIB
disconnected.
• Harness between VIB, BCU
disconnected.
• IPU defective
• BCU defective
SBU transmission error 144 D
After the SBU switches on, the
BCU detects one of the following
conditions on the SBU:
• 1 s after power on, the SYDI
signal does not go high, even
after 1 retry.
• 1 s after power on, the SYDI
signal goes high, but the SBU ID
could not be read after 3
attempts.
• SBU defective.
• VIB defective
• Harness (40-pin shielded) between the
SBU, VIB is disconnected.
• Harness (shielded cable) between the
VIB, BCU is disconnected.
• IPU defective
CIS lamp abnormal 181 D
After the CIS lamp trigger goes on,
the CIS lamp is not detected on.
Detecting the lamp on or off
determines the peak white level
value for shading correction. (If the
peak level is determined to be
below a certain level, the CIS lamp
is judged to be off.)
• CIS lamp defective.
• CIS power supply board defective.
• Harness between lamp and power supply
board is disconnected.
• Harness between CIS, ADF is
disconnected.
• CIS exposure glass dirty.
• White roller dirty or installed incorrectly.
• CIS unit defective.
• PSU defective
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