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Author Topic: Uni-t utp3705s  (Read 2807 times)

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Offline WestlineTopic starter

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Uni-t utp3705s
« on: October 19, 2015, 05:36:59 am »
I Hope someone can give me some advice with this since I'm stuck.
I recently bought a uni t utp 3705s power supply seams like the same as a tenma 72-8700a.
2 channel 0-32v 0-5a.
During a anodizing job I messed up channel 1 it blew the fuse and since then is unregulated stuck at 32v.
Channel 2 is still fine.
I have swapped the power transistors and op amp between the 2 channels and no joy.

Can someone give me some advice on where I can start looking, it seems like a common problem on these units.

Kind regrads
Westline
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Offline WestlineTopic starter

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  • Country: za
Re: Uni-t utp3705s
« Reply #1 on: October 19, 2015, 05:03:33 pm »
Hi I took another look and I forgot to mention the relays to switch to different coils on channel 1 clicks like crazy and sometimes the voltage jumps as high as 40v.



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Offline Rasz

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Re: Uni-t utp3705s
« Reply #2 on: October 19, 2015, 06:49:35 pm »
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Offline WestlineTopic starter

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  • Posts: 3
  • Country: za
Re: Uni-t utp3705s
« Reply #3 on: October 19, 2015, 06:58:06 pm »
One word... chineese


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