Gestetner A193 Service Manual page 501

SC322: Laser synchronization error (A193/A224)
-Definition- [B]
The laser synchronization signal cannot be detected by the main scan
synchroniziation detector board for more than 5 consecutive 100 ms intervals.
- Possible causes -
•
Poor connection of the interface harness which connects the laser
synchronization detector board and the BiCU board
•
Laser synchronization detector board out of position
•
Laser synchronization detector board defective
•
BiCU board defective
SC324: LD drive current over (A193/A224)
-Definition- [B]
The LD drive board applies more than 100 mA to the LD.
- Possible causes -
•
LD unit defective (not enough power, due to aging)
•
Poor connection of the interface harness which connects the LD unit and
the BiCU board
•
Temperature around the LD unit is too high
SC390: TD sensor error 1 (A193/A224)
-Definition- [B]
The TD sensor outputs less than 0.5V, 20 seconds after the TD sensor initial
setting has been performed.
- Possible causes -
•
TD sensor abnormal
•
Poor connection of the PCU
SC391: Development bias leak (A193/A224)
-Definition- [B]
A development bias leak signal is detected.
- Possible causes -
•
Poor connection of the PCU
•
High voltage supply board defective
SM
SC CODE DESCRIPTIONS
13-67 A224