Ricoh D104 Field Service Manual page 600

6. Troubleshooting
No. Type
571 A
No. Type
6
573 A
No. Type
574 A
598
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Pressure roller thermister error 4
The temperature measured by the pressure roller thermistor (end) does not reach 0
°C for 45 seconds.
• Loose connection of pressure roller thermistor (end)
• Defective pressure roller thermistor (end)
1. Check that the pressure roller thermistor (end) is firmly connected.
2. Replace the pressure roller thermistor (end).
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Pressure roller overheat 4 (software error)
The detected pressure roller temperature stays at 230°C or more for 1 second.
• Defective PSU
• Defective BCU
1. Replace the PSU.
2. Replace the BCU.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Pressure roller overheat 4 (hardware error)
The pressure roller thermistor (end) detects 250°C or more.
• Defective PSU
• Defective BCU
• Defective fusing control system
1. Replace the PSU.
2. Replace the BCU.