Ricoh D025 Service Manual page 491

No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
Zero cross error
The zero cross signal is detected 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
547 D
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 PSU
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
Pressure roller thermistor error
The temperature measured by the pressure roller thermistor does not
reach 0 °C for 6 seconds.
Loose connection of pressure roller thermistor
Defective thermopile
551 A
Defective pressure roller thermistor
Related SC code: SC 541
1. Check that the pressure roller thermistor is firmly connected.
2. Replace the thermopile.
3. Replace the pressure roller thermistor.
SM Appendix 3-39
SC Tables
D023/D025