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45
Chap 6 Maintenance & Troubleshooting
Breakdown Cause Solution
Check the power socket and
Running light
malfunction
Power off
Power supply
No sound from
extension
Disconnected wiring or malfunction of
telephone.
Reconnect the wiring or try to remove the
telephone’s failure
Bad connection Screw down the joint
Cacophony
The distributing of line is not reasonable Leave telephone from the disturbing source
Bad tone Mix using of non-standard telephones Use the standard telephones
Devoid function of incoming telephone
display
Apply to telecommunication office
No Caller ID display
Wrong setting of No-disturbing and it status.
Clear the No-disturbing and set incoming
telephone display
CO line disconnected Connect to the CO line
Dial-out malfunction
CO line is not connected well Check whether the line is connected well
Limited calling time Time limited Clear the limit
Cannot program the
telephone
Wrong coding
Check the programming extension and use the
right code
clear call forwarding or
Extension is set as call forwarding
or No-disturbing
No-disturbing
Extension close the ring check the telephone's ring
Extensions has the
dialing tone
but no ring
malfunction of telephone change the telephone
Others Others Refer to professional
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