Ricoh A172 - 1.8 Fusing

1.8 FUSING
SC541: Fusing (hot roller) thermistor open
- Definition - [A]
The output of the fusing (hot roller) thermistor goes to 5 V, corresponding
to 0°C.
- Possible causes -
• Fusing (hot roller) thermistor open
• Fusing unit not installed
• Main control board defective
SC542: Fusing (hot roller) warm-up error
- Definition - [A]
The fusing (hot roller) temperature does not reach the ready temperature
within 12 minutes after the main switch is turned on.
- Possible causes -
• Fusing (hot roller) thermistor not in position
• Fusing (hot roller) lamp open
• Fusing (hot roller) thermistor defective
• Main control board defective
SC543: Fusing (hot roller) overheat
- Definition - [A]
A fusing (hot roller) temperature of over 200°C is detected 5 times (within
5 seconds).
- Possible causes -
•
Fusing (hot roller) thermistor defective
•
AC drive board defective (triac)
•
Main control board defective
A172/A199 6-18 SM