Gestetner A193 Service Manual page 266

SC324: LD drive current over
-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
-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
-Definition- [B]
A development bias leak signal is detected.
- Possible causes -
•
Poor connection of the PCU
•
High voltage supply board defective
SC393: TD sensor error 2
-Definition- [B]
TD sensor output voltage falls out of the adjustment range (2.0 ± 0.2 V)
after the TD sensor initial setting has been completed.
- Possible causes -
•
TD sensor abnormal
•
Poor connection of the PCU
SM
SC CODE DESCRIPTIONS
6-5 (A193)