Ricoh D025 Service Manual page 494

SC Tables
No. Type
Zero cross frequency error
When the zero cross signal is 66 or more and it is detected 10 times or
more in 11 detections, the machine determines that input 60 Hz and
557 C
SC557 occurs.
Check the power supply source.
No. Type
Consecutive fusing jam
The paper jam counter for the fusing unit reaches 3 times. The paper
jam counter is cleared if the paper is fed correctly.
This SC is activated only when SP1159-001 is set to "1" (default "0").
559 A
Remove the paper that is jammed in the fusing unit. Then make sure
that the fusing unit is clean and has no obstacles in the paper feed path.
No. Type
Heating roller thermopile error
The temperature measured by the thermopile does not reach 0 °C for
20 seconds.
561 A
1.
2.
D023/D025
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Noise (High frequency)
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Paper jam in the fusing unit.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Loose connection of the thermopile
Defective thermopile
Check if the thermopile is firmly connected.
Replace the thermopile.
3-42 SM Appendix