Ricoh D037 Service Manual page 450

SC Tables
No. Type
Heating roller fusing lamp consecutive full power 1
When the fusing unit is not running in the ready condition, the heating
roller fusing lamp keeps on full power for 37 seconds.
545 A
Related SC code: SC 555
Replace the heating roller thermistor.
No. Type
Zero cross error
547 D
1.
2.
No. Type
551 A Heating roller thermistor (end) error 2
D037/D038/D040/D041
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Broken heating roller thermistor
Details (Symptom, Possible Cause, Troubleshooting Procedures)
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
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
Check the power supply source.
Replace the PSU
Details (Symptom, Possible Cause, Troubleshooting Procedures)
4-28 SM Appendix