Hello everyone,
I have this Panasonic KX-TD1232CE Digital Hybrid telephone system which has a problem with the dial tone. The problem is that during the "silent" part of the dial tone, in internal calls, there is a very harsh sound.
The system is very complex for my knowledge to even figure out where the problem might be. I had an initial check some months ago on it but did not find any solution. I did check the power supply which seemed to be working fine.
The system has 16 extensions plus an external board that adds 8 more (KX-TD174).
I doubt that the problem is with the CPU as the problem appear initially on the internal extensions and after few months on the add on extension board.
Capacitors did have a high ESR but i don't know if that could cause such a problem. Is it possible that the harsh sound is from a DC block capacitor not working?
I attached a recording in order to hear the problem. TURN DOWN the volume before listening! (it is in .zip format / .wav not allowed)
This weekend i will remove just the extension add on card to do some further component testing. Unfortunately because the PBX is online i have very limited time for debugging (only weekends mainly).
I have included service manual and some supplement manuals.
Any suggestions are really appreciated!
Thanks!
P.S. The PBX has another problem. After some power failures the internal analog CO line are dead and always come with busy dial tone. Now we only use the ISDN extension card. I don't think the problems are connected.
I have this Panasonic KX-TD1232CE Digital Hybrid telephone system which has a problem with the dial tone. The problem is that during the "silent" part of the dial tone, in internal calls, there is a very harsh sound.
The system is very complex for my knowledge to even figure out where the problem might be. I had an initial check some months ago on it but did not find any solution. I did check the power supply which seemed to be working fine.
The system has 16 extensions plus an external board that adds 8 more (KX-TD174).
I doubt that the problem is with the CPU as the problem appear initially on the internal extensions and after few months on the add on extension board.
Capacitors did have a high ESR but i don't know if that could cause such a problem. Is it possible that the harsh sound is from a DC block capacitor not working?
I attached a recording in order to hear the problem. TURN DOWN the volume before listening! (it is in .zip format / .wav not allowed)
This weekend i will remove just the extension add on card to do some further component testing. Unfortunately because the PBX is online i have very limited time for debugging (only weekends mainly).
I have included service manual and some supplement manuals.
Any suggestions are really appreciated!
Thanks!
P.S. The PBX has another problem. After some power failures the internal analog CO line are dead and always come with busy dial tone. Now we only use the ISDN extension card. I don't think the problems are connected.
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