Ricoh G188 Service Manual page 327

No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
Defective IH inverter
1. Check if the heating roller thermistor is firmly connected.
2. Replace the IH inverter.
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
Heating roller overheat (software error)
The temperature detected by the heating roller thermistor stays at
245°C or more for 1 second.
Defective PSU
553 A
Defective IOB
Defective BCU
1. Replace the PSU.
2. Replace the IOB.
3. Replace the BCU.
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
Heating roller overheat (hardware error)
The heating roller thermistor detects 250°C or more.
Defective PSU
Defective IOB
554 A
Defective BCU
Defective fusing control system
1. Replace the PSU.
2. Replace the IOB.
3. Replace the BCU.
SM Appendix
Service Call Conditions
3-31 G188/G189