Ricoh OR-C1 Field Service Manual page 422

3. Appendix: Service Call Conditions
No. Type
545 A
3
No. Type
547 D
No. Type
551 A
64
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Fusing overheat error 3 (center)
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)
• The zero cross signal is detected for 0.05 seconds three times even though
the heater relay is off when turning on the main power.
• The zero cross signal is not detected for 2 seconds even though the heater
relay is on after turning on the main power or closing the front door.
• Defective fusing lamp relay
• Defective fusing lamp relay circuit
• Unstable power supply
1. Replace the fusing lamp relay.
2. Check the power supply source.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Fusing thermistor open (end)
The temperature of the hot roller remained below 0
hot roller.
• Fusing thermistor out of its position because of incorrect installation
• Fusing thermistor disconnected or defective
• Power supply not within rated range (15% or more below rating)
1. Check the fusing thermistor is set correctly.
2. Replace the fusing thermistor.
3. Check the power supply source.
o
C for 5 sec. at the end of the