Ricoh D027 Service Manual page 31

SC Tables
No. Type
1.
2.
3.
No. Type
Fusing unit rotation error
The fuser rotation sensor does not detect change in the actuator for 0.5
seconds after the fusing/paper exit motor has turned on.
548 A
1.
2.
3.
4.
5.
No. Type
551 A Heating roller thermistor error
The temperature measured by the pressure roller thermistor does not
reach 0 °C for 7 seconds.
D027/D029 APPENDICES
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Defective fusing relay
Defective fusing relay circuit
Shorted +24V fuse on the PSU
Unstable power supply
Check the power supply source.
Replace the +24V fuse on the PSU.
Replace the PSU
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Defective fusing/paper exit motor
Deformed actuator for the fuser rotation sensor
Defective fuser rotation sensor
Broken connection between IH inverter and IOB
Incorrectly set fusing unit
Check if the fusing unit is correctly set.
Check or replace the actuator for fuser rotation sensor.
Replace the fuser rotation sensor.
Replace the IH inverter.
Check the connection between IH inverter and IOB.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Loose connection of pressure roller thermistor
Defective pressure roller thermistor
3-34 SM