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Connect a telephone set to the extension of the fax machine port where it is marked as EXT.
put the document on ADF or platen glass.
press OHD/Spk Key (get the dial tone)
Dial the required fax no.(get the ring back tone-then RX tone(some kind of beep tone)
Display shows sending (if not display may shows 1-sending,2-receiving, then press 1. for sending)
Take the hand set of the telephone hear the noise continuous.
If there is no noise, There some problem with hardware, misht be LIU card, main PBA or both. And you need the assistance of a trained service engineer.