Ricoh D0C8, Service Manual

Page: 621 / 1647

SC5xx: Paper Feed and Fusing
SM 6-47 D0CA/D0C9/D0C8/D0CB
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No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC572-02 A Pressure Roller Thermistor (edge: rear) (TH3) Cannot be Reloaded
SC572-12 D Pressure Roller Thermistor (edge: rear) (TH3) Cannot be Reloaded (Low
Power)
Fusing temperature failed to reach a temperature of 45 degrees C when 100
seconds passes after starting a job where the paper width is wider than 206
mm AND is equal or smaller than 216 mm.
•
Dirty or deformed Fusing Thermopile (TH1)
•
Pressure Roller Thermistor (edge: rear) (TH3) deformed or floating
•
Outside input voltage guarantee
•
Fusing Thermostat open
1.
Check the input voltage and replace the power plug (SC572-12 only).
2.
Replace the Fusing Thermostat.
3.
Replace the Fusing Sleeve Belt Assembly (fusing lamp).
4.
Replace the Pressure Roller Thermistor (edge: rear) (TH3).
5.
Replace the BiCU (PCB1).
6.
Replace the PSU (AC) (PCB17).
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC573-00 A
Pressure Roller Thermistor (edge: rear) (TH3) Overheat (Software Error)
Pressure Roller Thermistor (edge: rear) (TH3) detects a temperature of 248
degrees C for 10 consecutive times in a specific machine condition.
• Shorted triac
• Defective BiCU (PCB1)
1.
Reconnect the connectors between the fusing drawer connector, BiCU
(PCB1), and Pressure Roller Thermistor (edge: rear) (TH3).
2.
Replace the Pressure Roller Thermistor (edge: rear) (TH3).
3.
Replace the harnesses between the BiCU (PCB1) and the Pressure
Roller Thermistor (edge: rear) (TH3).
4.
Replace the BiCU (PCB1).
5.
Replace the fusing unit if all the above steps cannot resolve the issue.