Ricoh Aficio SP C440DN Field Service Manual page 592

6. Troubleshooting
No. Type
547 D
-03
No. Type
551 A
590
Details (Symptom, Possible Cause, Troubleshooting)
Zero cross error
• The zero cross signal is detected three times even though the heater relay is
off when turning on the main power.
• The zero cross signal is not detected for 2 seconds even though the heater
relay is on after turning on the main power or closing the front door.
• The detection error occurs twice or more in the 11 zero cross signal
detections. This error is defined when the detected zero cross signal is less
than 45.
• Unstable power supply
• Check the power supply source.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Heating roller thermistor (end) error 2
The temperature measured by the heating roller thermistor (end) does not reach
0°C for 6 seconds.
• Loose connection of heating roller thermistor (end)
• Defective heating roller thermistor (end)
1. Check that the heating roller thermistor (end) is firmly connected.
2. Replace the heating roller thermistor (end).