Hello all, We have a KX-TD500 with a basic shelf + expansion shelf. We have about 20 ESLC + 2 LCOT + 1 DHLC + 1 PRI + 1 CPU + 1 TSW cards configured on the TD500.
For the past two weeks we have been facing some weird issues with the expansion shelf. 1) At first on all the extensions configured on the expansion shelf, we couldnt hear the phone ringing properly on incoming calls i,e the ring was all broken & erratic. This problem later matured and there was no ring at all on incoming calls. Panasonic engineers who worked on this issue said there was some problem in the ringing circuit of the power supply. So we shut down the expansion shelf and sent the power supply to the service center for repair and later replaced with a new one. 2) During this we had to get some extensions on the expansion shelf configured on the lower shelf because the expansion shelf extensions are used for some of our critical departments. So we removed the amphenol connectors connected to the expansion shelf and connected them to the cards on lower shelf and reconfigured the needed extensions on them. This worked for a day and later the basic shelf power supply stopped working. The power supply's LED started ticking (tick..tick..tick..) everytime the TD500 was powered on and the system failed to start. So, again this power supply was replaced with a different one by the panasonic engineers. 3) Now, we have both the power supplys of TD500 functioning and the system starts up properly with all extensions working. But after 6 to 8 hrs after powering on the system we are observing the same ringing behaviour on all the extensions of the expansion shelf. 4) Shutting down the system and powering it on after a few minutes solves the problem for a while i,e all extensions/phones configured on the expansion shelf ring properly. 5) Nobody seems to have a clue on what the exact cause is and is turning out to be a wild goose chase. Below are the some of the guesses that we have heard from the panasonic engineers. a) The power supply on the expansion shelf is not able to handle the load of all cards. b) There is some magnetic induction from the field side i,e from the extensions side to where the phones are connected to. Could be due to power wirings and telephone wiring for the office going through the same conduit. We have verified the same and both the power wirings and telephone wirings use different conduits. c) Could be a short-circuit due to one of the ESLC or LCOT cards connected to the expansion shelf. We still need to verify this by systematically testing extensions on each card the next time the problem occurs. d) Could be a connection problem from the basic shelf to the upper shelf. e) Could be a problem with the expansion shelf mother board. The mother board was completely cleaned and serviced today. We havent found a way to verify this part yet. f) Word from the panasonic service center is that some transistors on both the power supplys (the faulty ones which were later replaced) failed and they suggested b), c) & e) could cause this problem. Iam no telecommunications expert and at a loss here in identifying the cause of this problem. Has anyone else using KX-TD500 faced similair issues ? All suggestions are welcome and iam all for trying those out. TIA Dushyanth _________________________________________________________________ KX-T Mailing list --- http://kxthelp.com/ Subscription changes: http://kxthelp.com/mailman/listinfo/kxt
