Ricoh D117 Service Manual page 390

No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
Zero cross error: fusing lamp relay contact welding
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 11 zero cross signal

547
detections. This error is defined when the detected number of zero
D
-01
cross signals is less than 45.
Defective fusing lamp relay (welded contacts)

Defective fusing lamp relay circuit

1. Turn off and on the main power switch.
2. Replace the PSU if the fusing lamp relay is defective.
3. Check the connection of the PSU to the controller board
replace the harness or controller board if necessary.
SM 6-29
SC Tables
and
D117/D118