Ricoh B230 Service Manual page 295

No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
ARDF communication error
After the ARDF is detected, the break signal occurs or communication
timeout occurs.
Incorrect installation of ARDF
ARDF defective
620 D
BICU board defective
External noise
1. Check the cable connection of the ARDF.
2. Shut out the external noise.
3. Replace the ARDF.
4. Replace the BICU board.
SM 4-55 B230/B237