Ricoh Aficio SP C440DN Field Service Manual page 591

No. Type
547 D Zero cross error (Fusing relay short)
-01
• 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 3 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.
• Defective fusing lamp relay
• Defective fusing lamp relay circuit
1. Replace the PSU.
2. Replace the BCU.
No. Type
547 D Zero cross error (Fusing relay open)
-02
• 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.
• Defective fusing lamp relay
• Defective fusing lamp relay circuit
• Short 24VS fuse
1. Replace the 24VS fuse (FU3/FU4).
2. Replace the PSU.
3. Replace the BCU.
Details (Symptom, Possible Cause, Troubleshooting)
Details (Symptom, Possible Cause, Troubleshooting)
SC Tables
589