Dell 1135N Service Manual page 140

Alignment and Troubleshooting
3) Defective FAX FORWARD/RECEIVE
Description : The FAX FORWARD/RECEIVE is not functioning.
1. Check if you can hear If the MODEM testing is normal
a dial tone by pressing and there is no dial tone, then try
OHD. to replace the LIU B'd.
2. Check if you can
If the MODEM testing is abnormal,
hear a RECEIVE tone while
try to replace the Main B'd.
MODEM testing in the
TECH Mode.
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Service Manual