One Telephone Live, But No Dial Tone; Wrong Extension Obtained When Dialling; Telephone Always Busy When Dialled; Telephone Always Unobtainable When Dialled - Marine microSwitch Technical Manual

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4.3.4

One Telephone Live, But No Dial Tone

If the symptoms are as described above but affecting one telephone only:
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Check the in/out of service telephones. Refer to the factory set configurations list.
If you have re-programmed the MicroSwitch exchange, print out the current
configuration.
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Check the wiring to the telephone. Check the operation of the telephone on
another extension. Replace as necessary.
í
Replace the Switch module.
4.3.5

Wrong Extension Obtained When Dialling

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Check if 'Call Forward' set on telephone.
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Check the directory to the equipment numbers. Re-allocate the number or re-wire
the extension.
í
Check all wiring from the back plane through to the telephone.
4.3.6

Telephone Always Busy When Dialled


Check if 'Call Forward' set on telephone.
ô
Check the wiring to the telephone. Check the operation of the telephone on
another extension. Replace as necessary.
í
Check that the appropriate LED on the front of the Switch module lights when the
telephone is 'off-hook'. If it does not, replace the Switch module.
4.3.7

Telephone Always Unobtainable When Dialled


Check the in/out of service telephones. Check if extension set to 'night bell'.
Refer to the factory set configurations list. If you have re-programmed the
MicroSwitch exchange, print out the current configuration.
ô
Check the directory to the equipment numbers. Re-allocate the number or re-wire
the extension.
í
Check all wiring from the back plane through to the telephone.
÷
Check the wiring to the telephone. Check the operation of the telephone on
another extension. Replace as necessary.
û
Check that the appropriate LED on the front of the Switch module lights when the
telephone is 'off-hook'. If it does not, replace the Switch module.
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