sundance-communications.com/forum Forums TDM Business Telephone Systems Vodavi Telephones & Systems Vodavi STS No Sync

Hello,

Looking for a hint or two.

I have(had) a Vodavi STS system with fourteen(14) 24 button phones that (had) been working just fine for about 14 years.
Then all of a sudden all phones went dead with the start up screen on the phones displayed with "NO SYNC".
I first powered down the system and disconnected all phones, pulled and reinserted all cards. VM, Station, Trunk
Powered up and waited about 2 minutes and then started to re-connect each phone one at a time. System
came back up except for one(1). Figured that it was the problem so I took it out of the system. All back to normal!!

Then 3 hours later it happened again. This time did the same as the first but nothing helped.

My question is which board would be the most likely to cause a NO SYNC??

Mother Board??

Voice Mail board??

Station Card (2 ea.)??

Trunk Card??

I am thinking the Mother Board, but then again???

Thanks for any input!!!

Have a good day.

Les

Trunks or T1?
If T1 look for led on T1 Card LD 6 is Out of Frame sync

If Trunks can you do an Event Trace?

Hopefully someone with more knowledge of the STS has an immediate answer for you.

Thanks Professor,

The Trunks are POTS CO Trunk Lines 4 in total.

System has already been removed from service, so no testing possible at this time.

Yes, I am hoping that someone can quickly say which board is the problem.

Thanks and have a good day.

Les

It's often a bad memory battery. If that's not it, it's probably the power supply which is intergrated to the STS KSU. 14 years was a good run. Time to upgrade.

Thanks phoneman,

Are you thinking the coin battery or the other soldered in CR123??

Needless to say when I get around to working on it I will change them both, but just courious.

BTW the upgrade is presently in the works!!

Thanks,

Les

The CR123.

Hi phoneman,

Thank you very much for the tip!!

Hope you had a good HUMP day!!

Les

I live in south central Pa, with many sts parts. contact me .
thanks gary s.

Ok, so on the off chance the battery was the issue I ordered a fresh Lithium Battery
with tabs. It arrived yesterday and today I decided to install on the mother board.
Removed old and soldered in new. Also replaced the CR2032 battery on the
Voice Mail card. Connected a phone for Ext 100. Moment of truth!!

Flipped the on switch!!! ............................

System powers up, all blinky lights.

Display on phone>>>> NO SYNC

Nothing has changed. I am thinking that the problem is greater than the battery.

Removed all cards and powered up. No change!! (Expected)

Swapped the Station cards. No Change!!

Tried to do a system reset by holding SW1 on power up!! No Change!!

Tried to do a Default to Factory with Switch 8 on SW5!! No Change!!

Ok, So I am tapped out on what would be next to try.

Any extra thoughts out there?? Mother Board??

Thanks for any input!!

Les

Have you tried just installing one card at a time: test; another card: test... ?