Ricoh OR-C1 Field Service Manual page 424

3. Appendix: Service Call Conditions
No. Type
3
554 A
No. Type
555 A
No. Type
557 C
66
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Fusing overheat error 2 (end)
A fusing temperature over 250°C is detected at the center of the hot roller by the
fusing temperature monitor circuit in the BCU board.
The power was interrupted for more than 0.3 sec.
• TRIAC short on PSU (PSU defective)
• BCU board defective
• Fusing thermistor defective
• Power supply voltage unstable
1. Replace the PSU.
2. Replace the BCU board.
3. Replace the thermistor.
4. Check the power supply source.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Fusing overheat error 3 (end)
After warmup, the center of the hot roller attained full operating temperature and
maintained this temperature for 10 sec. without the hot roller rotating.
• Center hot roller thermistor installed incorrectly, disconnected.
• Center hot roller thermistor defective
1. Check the hot roller thermistor is set correctly.
2. Replace the hot roller thermistor.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Zero cross waveform signal error
The waveform of the zero cross signal was detected out of range.
• Electrical noise on the power supply line
Check the power supply source.