analog phones doesn't ring

[kris5446]

we had TDA 100 Panasonic system, the analog phones doesn't ring anymore , for example when i call extension 110 that use analog phone it doesn't ring but when i pick up the phone we can talk with
all of analog phone did the same thing!! but for digital phone everything is running fine!
btw this console worked a year fine and this problem happened recently

sorry for my poor english. if you need more information about the problem just asked ... please help

thanks in advance

 

[ironhorse17]

Take your test set and monitor other used and unused analog extensions for ringing voltage.

 

[obtsystems]

it could be your power supply/ring generator.
do you hear the relay click when ringing slt at the ksu.

The ring gen is on the card of the ncp, not sure if it is on the tda

 

[kris5446]

if the problem is power supply how can it be possible that it works fine with digital phones !!

all of the analog extensions have this problem too
sound of relay click is good idea, I'll check that and inform you about the result

 

[kris5446]

does anyone know about the station clear (790) . i never try this and don't know how it works!
do you find it useful for this issue

 

[obtsystems]

Slt use 95-110vac for to ring phones. Digital phones don't so the ring gen is only used for slt units