Dell 1135N Service Manual page 146

9) Defective Automatic Receiving
Description : The automatic receiving function is not working.
1. Check if the RECEIVE Mode is
TEL MODE or FAX MODE.
Service Manual
Alignment and Troubleshooting
4-73
1. If the RECEIVE Mode is set to
the TEL MODE, reset it to the
FAX MODE.
2. Even after the RECEIVE Mode
is changed to the FAX Mode,
it cannot receive, then try to
replace main board.