sundance-communications.com/forum Forums TDM Business Telephone Systems Mitel Telephones & Systems SX200 Supersets

I need help on my sx200 analog system. I have only 1 superset card and 4 superset phones installed.. The problem is that they keep cutting out in the middle of conversations..I notice also that there is a clicking noise every now and again that comes thru even the set is offline..

Any one have any idea what may be causing this??

Thanks

Well do you have a spare line card, have you tried replacing the card yet. That would be my first choice before looking at the peripheral control cards. Some of those older line cards exhibited those problems.

Did you mean the superset card? If so yes I tried 2 different cards and they exhibited the same problems..so I decided to get the supersets themselves and it seemed OK for the first couple of days then problematic again..

What is the voltage on the line? As I recall tech support had me set it to -45.5… but it’s been quite a few years. If it is a new problem on an existing install, you may need a new card. You could also try the unused ports.

I'm betting it's the power supply!
Measure the volyages on the back plance, and I think you'll see that at least one of them (8v??) is out of tolerance.

There are pots on the back door power supply you can adjust, if you've got a steady hand!

I think Fred may be right - plus or minus 8 or 10 volts might be off (and their tolerance is pretty tight) but I would also check to make sure you have a good ground. Sometimes I even had static build up in the cable running to the sets and had to ground spare pairs to get rid of the problem. good luck - when you get this kind of Gremlin in your system it can be tough to weed out.

Another possible source is the fuses on the backplane of the early analog shelves. The fuses and clips build up a layer of corrosion and cause problems. The most common problem is cross-talk. Short term cure is shut down system is to shut down system, open the back door and pull and reinstall each fuse several times to 'polish ' off the corrosion. Long term cure is shut down system and solder a jumper across the clips. The fuses were eliminated , eventually. Careful with this one, a solder drip can knock out the whole system and fry stuff! There are 4 fuses on each shelf, and access is obscured by the Amphenol connectors. John C.

the 48V and 10V are very important to run the SS4, these two voltage rails must be right on, the 10V must be 10.0V and the 48V must be 48.0V. After you adjust one check the other to make sure it hasn't changed.