Ricoh G165 Service Manual page 138

Service Call Conditions
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
547
1. Turn the main power switch off and on.
Execute "Fuser SC Reset" with SOM (printer models) or "Engine
Maintenance Menu" (MF model) to recover the machine after completing
the recovery procedure. Otherwise, the machine continues to issue this
SC code and cannot be operated.
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 "Fuser SC Reset" with SOM (printer models) or "Engine
Maintenance Menu" (MF model) to recover the machine after completing
the recovery procedure. Otherwise, the machine continues to issue this
SC code and cannot be operated.
G165/G166/G167/G181/G183/G184 4-14 SM