B140 SERIES AND G126 SERVICE MODE
SM 4-39 B064 Series/B140 Series/G126
Trouble-
shooting
Scanner home position error 3 122 D
The scanner home position sensor
does not detect the on 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
installed incorrectly
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
installed incorrectly.
SBU auto adjust error 143 C
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
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
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