Ricoh PE-P4 Field Service Manual page 169

Zero Cross Error
The zero cross signal is not detected for three seconds even though the fusing lamp relay is on
after turning on the main power or closing the front door.
• Defective fusing lamp relay
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1. Turn the main power switch off and on.
• Execute "Engine Maintenance Menu" to recover the machine after completing the
recovery procedure. Otherwise, the machine continues to issue this SC code and cannot
be operated. The power should be turned off and on after the recovery procedure.
Low Temperature Error
The center thermistor detects 100°C or less for 4 seconds.
• Defective fusing lamp
• Defective thermistor
1. Replace the fusing unit.
548
2. Replace the fusing lamp.
• Execute "Engine Maintenance Menu" to recover the machine after completing the
recovery procedure. Otherwise, the machine continues to issue this SC code and cannot
be operated.
Zero Cross Frequency Error
The detection error occurs ten times consecutively in ten zero cross signal detections. This error
is defined when the detected zero cross signal is 17 or less/27 or more for 0.2 seconds.
• Defective fusing lamp relay
• Unstable input power source
1. Check the power supply source.
557
2. Replace the fusing unit.
3. Turn the main power switch off and on.
• Execute "Engine Maintenance Menu" to recover the machine after completing the
recovery procedure. Otherwise, the machine continues to issue this SC code and cannot
be operated. The power should be turned off and on after the recovery procedure.
Service Call Conditions
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