Ricoh D027 Service Manual page 33

SC Tables
No. Type
Heating roller overheat (hardware error)
The heating roller thermistor detects 240°C or more.
554 A
1.
2.
3.
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.
1.
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.
D027/D029 APPENDICES
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Defective PSU
Defective IOB
Defective BICU
Defective fusing control system
Replace the PSU.
Replace the IOB.
Replace the BICU.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Noise (High frequency)
Check the power supply source.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Paper jam in the fusing unit.
3-36 SM