Ricoh Aficio MP C305SP Field Service Manual page 661

No. Type
Zero cross error: low frequencies 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 number of zero cross
547 signals is less than 45.
D
-03
• Unstable frequencies from utility power line
• Defective fusing lamp relay circuit
• Unstable power supply
1. Turn off and on the main power switch.
2. Check the utility power line.
3. Check the connection of the PSU to controller board and replace the harness
or controller board if necessary.
No. Type
Heating roller thermistor error
The temperature at the end of the heating roller measured by the heating roller
thermistor does not exceed -11°C or -41°C for the prescribed time.
551 A
• Broken thermopile or thermistor
• Defective connectors
1. Check that the heating roller thermistor is firmly connected.
2. Replace the thermopile or thermistor.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC Tables
659