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4.3.8
All Telephones Fail to Ring, But Ring Tone can be Heard by
Caller
Check if 'ringing' indicator on front of the PSU is illuminated when ringing a
phone. If not, replace the fuse.
ô
If fault still present, replace PSU.
í
If fault still present, replace Switch module board in slot 1.
÷
If installing new system, ensure all telephones do not have the bell turned off.
Check also, if 'master' boxes required for telephone connection, and check the
wiring of the telephones.
4.3.9
One Telephone Fails to Ring, But Ring Tone can be Heard by
Caller
Check destination telephone by dialling *6 (self test). If telephone rings, check
directory to the equipment numbers.
ô
Check if the bell is turned off on the telephone. Check the wiring to the telephone.
Check the operation of the telephone on another extension. Replace as necessary.
í
Check if a 'master' box is required for the telephone connection.
÷
Replace the Switch module.
4.3.10
Intermittent Dial Tone
Check if 'Call Forward' or 'Call Transfer' has been selected. The dial tone will
automatically change to intermittent when these features have been selected, or
during self test.
ô
Check if dialling has been disabled. This is often the case with emergency
telephones or the night bell.
4.3.11
Crosstalk on Conversation
Check for intrusion from officer class telephone.
ô
Check if telephone set up as an emergency telephone, since this facility allows
any other telephone to intrude on a current call.
í
Check the wiring. This is the most probable cause in a new installation.
÷
Change the appropriate Switch module.
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