Dell 1135N Service Manual page 139

Alignment and Troubleshooting
2) Defective MF DIAL
Description : The MF DIAL is not functioning.
If you cannot hear the OHD
1. Check if the telephone line is
CLICK sound, the OPE Ass'y may
connected correctly.
be defective. Try to replace the
OPE Ass'y.
If you can hear a click sound,
replace the main board.
2. Wile the BUTTON KEY is
Notes : Product support the MF
pressed, check for
DIAL type only.
a CLICK sound.
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Service Manual