Ricoh A229 Service Manual page 428

SC323: LD drive current over
-Definition- [B']
The LD drive board applies more than 110 mA to the LD.
- Possible causes -
• LD unit defective (not enough power, due to aging)
• Poor connection between the LD unit and the SBICU board
• SBICU defective
SC326: 2nd laser synchronization error
-Definition- [B]
The 2nd laser synchronization signal cannot be detected by the main scan
synchronization detector board even if the laser diodes are activated.
- Possible causes -
• Poor connection between the laser synchronization detector board and the
LD unit
• Laser synchronization detector board out of position
• Laser synchronization detector board defective
• LD unit defective
SC327: LD unit home position error 1
-Definition- [B']
The LD unit home position sensor does not detect an on condition when the LD
unit moves to its home position.
- Possible causes -
• LD unit home position sensor defective
• LD positioning motor defective
• LD unit movement blocked because of incorrect connector routing
SC328: LD unit home position error 2
-Definition- [B']
The LD unit home position sensor does not detect an off condition when the LD
unit moves from its home position.
- Possible causes -
• LD unit home position sensor defective
• LD positioning motor defective
• LD unit movement blocked because of incorrect connector routing
SM
SERVICE CALL CONDITIONS
6-5 A229