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#608570 - 03/06/17 08:13 PM DX 80 OR DX 120 KSU Problems
RATHER BE FISHING Offline

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Registered: 08/22/04
Posts: 8709
Loc: SOUTH TEXAS
As these systems are aging they seem to develop the similar problem.... chattering on the boards then eventually the KSU just dies. Looks like a voltage regulator issue on the main board in the KSU. Anyone ever troubleshoot this down to the particular component that most often fails?
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#608583 - 03/07/17 09:11 AM Re: DX 80 OR DX 120 KSU Problems [Re: RATHER BE FISHING]
ComdialJim Offline
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Registered: 05/13/05
Posts: 887
Loc: Lindenhurst, NY 11757
I see it mostly on the DX120's Its amazing they all seem to be going bad at the same time.
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SST Communications
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Business telephone systems on Long Island and New York City like Comdial, Vertical, Avaya, Panasonic

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#608586 - 03/07/17 09:49 AM Re: DX 80 OR DX 120 KSU Problems [Re: RATHER BE FISHING]
ATechguy Offline
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Registered: 11/26/06
Posts: 567
Loc: Durham/Kaw.Ont,Canada
I would check all the Capacitors 1st.

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#608609 - 03/07/17 07:03 PM Re: DX 80 OR DX 120 KSU Problems [Re: RATHER BE FISHING]
RATHER BE FISHING Offline

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Registered: 08/22/04
Posts: 8709
Loc: SOUTH TEXAS
Found two swollen caps. Replaced them and it allowed the system to boot but really flakey. LEDs blinking look weak and off tempo. Will go further into the ICs to see what I can find.
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#608613 - 03/07/17 08:30 PM Re: DX 80 OR DX 120 KSU Problems [Re: RATHER BE FISHING]
ATechguy Offline
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Registered: 11/26/06
Posts: 567
Loc: Durham/Kaw.Ont,Canada
If you haven't already check power supply output,, could be power supply is getting weak.

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#608833 - 03/15/17 06:21 PM Re: DX 80 OR DX 120 KSU Problems [Re: RATHER BE FISHING]
RONAROUND Online   content
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Registered: 05/11/10
Posts: 24
Loc: NE OHIO
when this happens we put in a loaner for 2 weeks and they need to update to a new system. I have noticed as you have, they can drop dead a couple a week sometimes after 6-8 years. its the base layer cabinet, sometimes we just swap out the CPU and vmail with a working used base chassie and good to go.
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Phone World Inc.
Ashtabula,Ohio

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#608842 - 03/15/17 08:28 PM Re: DX 80 OR DX 120 KSU Problems [Re: RATHER BE FISHING]
RATHER BE FISHING Offline

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Registered: 08/22/04
Posts: 8709
Loc: SOUTH TEXAS
Yep. Been doing that too. Now I have a collection of bad main boards I'd like to fix if I can ever get the time to sit down and figure out which component is going south.
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