Dynacomp 605-5001

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Last seen: 1 month 2 weeks ago
Joined: Apr 23 2022 - 18:41
Posts: 91
Dynacomp 605-5001

Hello group,

I discovered I have a Dynacomp PSU thst will change the +5/-5 rails drastically after 15-20 minutes of being powered. They hold a good 5.03/-5.12 for 15-20 minutes then I see them (dropping on the +5 and increasing in the -5). Will change from 5.03/-5.12, minute later 5.02/-5.11, minute later 5.01/-5.10 it will keep going. I left the room for a few minutes and when I came back they were at 3.45/-3.75. I shut it down. After a full recap it did the same thing.  After I shut it off for 5 seconds and power back up it holds fine for the same 15-20 minutes before changing again.  I’ve read several posts here in PSU issues and I have a feeling this problem is deeper. First time I’ve seen this happen with a PSU. 

Any input would be appreciated. 

Thanks

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Last seen: 1 day 22 hours ago
Joined: Jun 12 2022 - 23:35
Posts: 107
It sounds like there's a

It sounds like there's a problem in the feedback of the switcher.  Without a schematic it's hard to say, but for example, if it uses a TL431 or optocoupler for the feedback, those may need replacement.

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Last seen: 1 month 2 weeks ago
Joined: Apr 23 2022 - 18:41
Posts: 91
Thanks for the reply,I couldn

Thanks for the reply,

I couldn’t find a schematic for this Dynacomp. I remember looking months ago when I was recapping PSUs. Astec schematic yes Dynacomp no soap. I would like to repair it if possible before throwing in the towel. 

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