Ricoh D143 Field Service Manual page 818

6. Troubleshooting
No. Type
553 A
No. Type
554 A
816
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Heating roller overheat: End (software error)
The detected heating roller temperature stays at 215°C or more for 1 second for
10 consecutive times.
• Defective AC controller board
• Defective IOB
• Defective IPU
Related SC code: SC 543
1. Replace the AC controller board.
2. Replace the IOB.
3. Replace the IPU.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Heating roller overheat: End (hardware error)
The heating roller thermistor detects 220°C or more.
• Defective AC controller board
• Defective IOB
• Defective IPU
• Defective fusing control system
1. Replace the AC controller board.
2. Replace the IOB.
3. Replace the IPU.