Fusing - Ricoh A109 Service Manual

1.8 FUSING

SC541: Fusing thermistor open
- Definition - [A]
The output of the fusing thermistor goes to 5 V, corresponding to 0°C.
<Possible causes>
•
Fusing thermistor open
•
Fusing unit not set
•
Main control board defective
SC542: Fusing warm-up error
- Definition - [A]
Fusing temperature does not reach the ready temperature within 12
minutes after the main switch is turned on.
<Possible causes>
•
Fusing thermistor not in position
•
Fusing lamp open
•
Fusing thermistor defective
•
Main control board defective
SC543: Fusing overheat
- Definition - [A]
Fusing temperature of over 200°C is detected 5 times (5 seconds).
<Possible causes>
•
Fusing thermistor defective
•
AC drive board defective (triac)
•
Main control board defective
SC544: Fusing low temperature abnormal
- Definition - [A]
Fusing temperature of below 90°C is detected 6 times (6 seconds) after
warm-up is completed.
<Possible causes>
•
Fusing thermistor defective
•
AC drive board defective
•
Main control board defective
•
Fusing thermistor not in position
•
Fusing lamp open
FSM 6-17 A109