sundance-communications.com/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems interrupter issu

Guys,

The wink on hold on my 551b is flickering. Call notification and ringing are normal, as well as steady on. Would that be caused by a dirty contact? If so, is it possible to clean it? Thanks in advance!

Mike

Would that be caused by a dirty contact? Maybe.

...is it possible to clean it? Yes.

Does it happen on all line circuits? Have you moved the line cards around to see if it follows the cards or stays in the same circuit?

Is the flickering regular or random? It's possible that the cam that operates the contact is worn or wearing out.

Try removing and re-seating the interrupter in its socket. There may be crud on the printed circuit fingers or the socket contacts.

If that doesn't fix it, take the cover off the interrupter and clean the cam-operated contacts with a business card held between the contacts while you do a wiping motion.

Do NOT use any chemicals, or abrasives, on the contacts.

Dug a little deeper. Lines 3 and 4 work fine. The LEDs on the 400h cards show the same as the phones, so I would assume it's not from the cards to the block. Once I opened the cabinet it got worse, so I was thinking wiring. It would change when I wiggled the wiring from the block to the cards. I dug deeper to see any visual issues or broken wires and nothing. Once I got done poking around, everything was fine. Since I can't duplicate the problem anymore, I'm kind of stuck. Is there a schematic for the unit itself? I have the BSP, but it's just showing the block wiring. I'm assuming it's a feed from the interrupter to the top 2 cards. I would like to find out which terminal/wire color work with that circuit.

If you're not going to try removing and re-inserting the interrupter, then you are bypassing one possibility.

If the wiring is loose going to the 1st and 2nd card slot, then you need to find the LW lead that feeds those two slots.

On a 400 card, the LW feed comes in on pin #2.

The LW lead is only winking when the interrupter motor is running, so in order to test the lead for flickering with a test lamp, you need to start the interrupter, either by placing a line on Hold, or by grounding the ST (motor start) lead, which appears on pin 5 of each slot. If the interrupter is not running, (and is in its home position) the LW lead will have steady lamp battery on it.

I did pop the interrupter out when I checked the wires the first time. I was thinking that one terminal fed the LW for the whole thing, so I didn't think that was the fix. The wiring is good, and it has been working perfectly. Problem solved. Thanks again!