Dell 1135N Service Manual page 142

Alignment and Troubleshooting
5) Defective FAX RECEIVE (1)
Description : FORWARD is functioning, but RECEIVE is not functioning or the received data is
broken.
1.Check if there is NOISE
If it makes NOISE while
when pressing on-hook dial.
on-hooking, replace or repair
the telephone line.
2.Check the RECEIVE
condition by trying to receive a
FAX at another fax machine.
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Service Manual