Samsung CLX-3185 Service Manual page 147

Alignment & Troubleshooting
7) Defective FAX RECEIVE (3)
Description
The phone is ringing continuously, but it cannot receive.
Even when the RECEIVE Mode is
Check if the RECEIVE Mode is
changed to FAX MODE, it cannot
TEL MODE or FAX MODE.
receive, then replace the LIU and
the Main B'd in sequence.
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Service Manual
Samsung Electronics