Ricoh A229 Service Manual page 442

SC542: Fusing temperature warming-up error
-Definition- [A]
The fusing temperature does not reach the fusing standby temperature within 5
minutes after the main power switch is turned on.
- Possible causes -
• Fusing thermistor defective or out of position
• Fusing lamp open
• Fusing thermofuse open
• SBICU defective
• Power supply board defective
• Poor fusing unit connection
SC543: Fusing overheat error 1
-Definition- [A]
A fusing temperature of over 231°C is detected for 5 seconds by the fusing
thermistor.
- Possible causes -
• Fusing thermistor defective
• SBICU defective
• I/O board (IOB) defective
SC545: Fusing overheat error 2
-Definition- [A]
The fusing lamp stays on at full power for 45 seconds while in the stand-by
condition after warming-up is completed.
- Possible causes -
• Fusing thermistor out of position
SC546: Fusing ready temperature malfunction
-Definition- [A]
The fusing temperature goes 20 °C below or 20 °C over the stand-by
temperature after warm-up is completed.
- Possible causes -
• Poor thermistor connector connection
• Poor fusing unit connection
SM
SERVICE CALL CONDITIONS
6-19 A229