Scanner Motor Too Fast; Scanner Motor Too Slow; Drum Thermistor - Ricoh FT4430 Service Manual

2C SCANNER MOTOR TOO FAST
= Possible Causes -
+ Scanner motor control circuit failure.
- Action -
+ Replace the main board.
2D SCANNER MOTOR TOO SLOW
- Possible Causes -
+ Scanner motor control circuit failure.
- Action -
Replace the main board.

31 DRUM THERMISTOR

- Possible Causes -
+ Drum thermistor circuit open.
+ Drum thermistor circuit short.
- Action -
Is the input at CN203-I 7 less than 0.14 volts?
N
Y
I
Is the input at CN203-I 7 about 5 volts?
I
Y N
I
Replace the main board.
Replace the erase unit.
11-23
16 April '88