Ricoh Aficio Color 4006, Service Manual

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24 February 1999 SC CODES
7
SC
No.
Item Detection Conditions Possible Causes
Related
SCs
Troubleshooting Procedure Type
SC320 Polygon motor
error
- Condition -
•
The PMLOCK signal is not
received by the LD main
control board within a
predetermined period of
time.
•
Poor connection of
connector
•
Defective polygon
motor
•
Defective LD main
control board
•
Defective scanner
IPU board
1. Check that the connector (CN602-4) on the LD control
board is properly connected.
2. Check the continuity of cable.
3. Replace the polygon motor.
4. Replace the LD main control board.
5. Replace the scanner IPU board.
D
SC322 Laser
synchronizing
signal error
- Timing & Condition -
While the polygon motor is
running and the laser diode is
on, the LD main control board
does not receive the laser
synchronizing signal.
•
Poor connection of
connectors
•
Defective laser
synchronizing
detector board
•
Improper laser
beam axis
•
Defective LD
control board
•
Defective main
control board
•
Defective optic
housing unit
1. Check if the connectors (CN 604) are properly
connected on the laser synchronizing detector board
and LD main control board
2. Remove and clean the synchronizing detector board.
3. Check if anything such as the seal of the barrel toroidal
lens in the optic housing unit interferes with the laser
beam axis.
4. Replace the synchronizing detector board.
5. Check if the cable connectors (CN1 & CN605) on the
LD drive board and LD main control board are properly
connected or check the continuity of the cable.
6. Check if the cable connectors (CN601 & CN306) on the
LD main control board and main control board are
properly connected or check the continuity of the cable.
7. Replace the LD main control board.
8. Replace the main control board
9. Check the optical housing unit or replace it.
D