Ricoh Aficio SP C440DN Field Service Manual page 596

6. Troubleshooting
No. Type
564 A
No. Type
565 A
594
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Pressure roller overheat 3 (hardware error)
The pressure roller thermistor (center) detects 250°C or more.
• Defective PSU
• Defective BCU
• Defective pressure roller thermistor (center)
• Defective fusing control system
1. Replace the pressure roller thermistor (center).
2. Replace the PSU.
3. Replace the BCU.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Pressure roller fusing lamp consecutive full power 3
When the fusing unit is not running in the ready condition, the pressure roller
fusing lamp keeps ON full power for 30 seconds or more.
• Broken pressure roller thermostat
• Broken pressure roller fusing lamp
1. Replace the pressure roller fusing lamp.
2. Replace the pressure roller thermostat.
3. Replace the PSU.