Ricoh MT-C1 Service Manual page 401

15 February 2006
SC No.
123 D Scanner home position error 4
The scanner home position sensor
does not detect the off condition
during original scanning.
143 D SBU auto adjust error
Automatic adjustment of the SBU
fails when the machine is switched
on.
144 D SBU transmission error
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.
Symptom
4-13
B064 SERIES SERVICE MODE
Possible Cause
• 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.
• 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 defective.
• VIB defective
• Harness (40-pin shielded) between the
SBU, VIB is disconnected.
• Harness (shielded cable) between the
VIB, BCU is disconnected.
• IPU defective