Service manual

SC TABLE
SM 4-11 G130/G131
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
SC 220 Synch.
detection signal
error 1
220-001: Y
220-002: M
220-003: C
220-004: K0
220-005: K1
The front (for K&Y) or rear (for
C&M) laser synchronizing
detector board, (used to
determine the start timing of
laser writing), does not send a
signal while the polygon motor
operates normally and the LD
is on.
• Disconnection of the
cable between front
(K&Y) or rear (C&M)
synchronizing detector
board and the LD unit
• Incorrect installation of
front (K&Y) or rear
(C&M) synchronizing
detector board (the
beam does not target
the photo detector.)
• Defective LD unit
• Defective BCU
• Defective +5VLD
circuit
SC221-
1 to 4
1. Turn the main switch off and on.
2. Check the cable connection between
front (for K&Y) or rear (for C&M)
synchronizing detector board and the
LD unit.
3. Check or reinstall the front (for K&Y)
or rear (for C&M) synchronizing
detector board.
4. Replace the front (for K&Y) or rear
(for C&M) synchronizing detector
board.
5. Replace the laser optics-housing
unit.
6. Replace the BCU.
7. Replace the PSU.
D