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HSPY-400-01 Bench PSU blows fuse every time switched ON.
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ocset:
Hello,
Does anyone have a schematic for this HSPY-400-01 power supply?
https://www.aliexpress.com/item/32596957736.html?spm=2114.search0302.3.81.ccbb53d65TzmOP&ws_ab_test=searchweb0_0,searchweb201602_0,searchweb201603_0,ppcSwitch_0&algo_pvid=c7aae6c6-d073-4ea2-9d64-8d3c64182897&algo_expid=c7aae6c6-d073-4ea2-9d64-8d3c64182897-10

…ours blows the fuse with a loud bang every time its switched ON. It worked fine till three weeks ago.
Whilst I am disassembling it, and taking photos so I can re-assemble afterwards, does anyone know if there  is a common failure mode with this PSU?

I am wondering  if it has a inrush relay which has failed with locked contacts. Its going to take me a while to  disassemble as it has common mode chokes swinging in the gap between upper and  lower main boards, and I am photo’ing it all so I know how to re-assemble it. So I am just  planning ahead.

This shows another post abotut this PSU
https://www.eevblog.com/forum/testgear/hspy-power-supply/
CDaniel:
That should be a SMPS , many components can fail , from input bridge rectifier to power transistors ... if it blows the fuse , the shorted component shoudn't be very hard to indentify .
rvalente:
Start measuring the obvious components, just like our friend suggeted.

After that, you can add a 60-100W lamp in series, the lamp will glow but, you can now poke around with your multimeter and check for shorts.
nctnico:
For this price I'd buy a new one. And... a power supply specialist shouldn't have a problem diagnosing a switching PSU.
Kleinstein:
At low weight and 400 W is must be a switched mode supply. So chances are there is something broken - if not obvious visible or with experience in such repairs one would probably just buy a new one and not spend much time / money on a repair.

One could do a few in circuit tests on the diodes and power transistors. But even if finding a bad one (e.g. shorted) does not help much as chances are there are more faults.
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