Ricoh D104 Field Service Manual page 596

6. Troubleshooting
No. Type
547 D
6
No. Type
551 A
594
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Zero cross error
• 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.
• The detection error occurs twice or more in the 11 zero cross signal detections.
This error is defined when the detected zero cross signal is less than 45.
• Defective fusing lamp relay
• Defective fusing lamp relay circuit
• Unstable power supply
1. Check the power supply source.
2. Replace the shorted 24V fuse on the PSU.
3. Replace the PSU
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Heating roller thermistor (end) error 2
• The temperature measured by the heating roller thermistor (end) does not reach
0°C for 150 seconds when the machine's inside temperature is 5°C or more.
• The temperature measured by the heating roller thermistor (end) is -5°C or less
for 8 seconds.
• Loose connection of heating roller thermistor (end)
• Defective heating roller thermistor (end)
1. Check that the heating roller thermistor (end) is firmly connected.
2. Replace the heating roller thermistor (end).