Ricoh RN-MF2 Field Service Manual page 142

6. Troubleshooting
Fuser full heater error
The fuser full heater remained ON at full capacity for more than 9 s after the fusing
temperature attains reload temperature.
• Deformed thermistor
• Thermistor not in the correct position
• Defective fusing lamp
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1. Replace the fusing unit.
2. Replace the fusing lamp.
• Execute "Fuser SC Reset" to recover the machine after completing the recovery
procedure. Otherwise, the machine continues to issue this SC code and cannot be
operated.
Zero cross error
• The zero cross signal is detected three times even though the fusing lamp relay is off
when turning on the main power.
• The zero cross signal is not detected for 3 seconds even though the fusing lamp relay is
on after turning on the main power or closing the front door.
• The detection error occurs twice or more in 11 zero cross signal detections. This error is
defined when the detected zero cross signal is less than 45.
• The zero cross signal is not detected three times while the main power remains ON.
547
• Defective fusing relay
• Defective fusing relay circuit
• Shorted +24V fuse on the PSU
• Unstable power supply.
1. Check the power supply source.
2. Replace the +24V fuse on the PSU.
3. Replace the PSU
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