Ricoh FT4480 Field Service Manual page 229

15 March 1987
2 C S C A N N E R M O T O R T O O F A S T
- Possible Causes -
• Scanner motor control circuit failure
- Action -
Replace the main board.
2 D S C A N N E R M O T O R T O O S L O W
- Possible Causes
• Scanner motor
- Action -
Replace the main
3 1 D R U M T H E R M I S T O R
- Possible Causes -
• Drum thermistor circuit open
• Drum thermistor circuit short
- Action -
Is the input at CN203-17 less than 0.14 volts?
Y N
I
Is the input at CN203-17 about 5 volts?
Y N
I
Replace the main board.
Replace the erase unit.
-
control circuit failure
board.
9-24