Ricoh B230 Service Manual page 293

No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
Heating roller overheat 3 (software error)
The detected fusing roller temperature stays at 230°C or more for 1
second.
Defective PSU
Defective IOB
563 A
Defective BICU
1. Replace the thermistor.
2. Replace the PSU.
3. Replace the IOB.
4. Replace the BICU.
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
Heating roller overheat 3 (hardware error)
The thermopile detects 250°C or more.
Defective PSU
Defective IOB
Defective BICU
564 A
Defective fusing control system
1. Replace the thermistor.
2. Replace the PSU.
3. Replace the IOB.
4. Replace the BICU.
SM 4-53 B230/B237