Power supply 400-5261-01x blowing fuse

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Hrvat9
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Power supply 400-5261-01x blowing fuse

Postby Hrvat9 » November 13th, 2017, 3:03 am

The top portion of my versus city power supply is blowing the fuse on power up.
Is this cap related or a volt reg inside ?
It had the thickest layer of dust I’ve ever seen on a psu
And a couple of the resistors/ caps have rust on them :(
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Last edited by Hrvat9 on November 13th, 2017, 3:22 am, edited 1 time in total.
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Hrvat9
Posts: 92
Joined: April 26th, 2017, 3:47 pm
Location: Canada
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Re: Power supply 400-5261-01x blowing fuse

Postby Hrvat9 » November 13th, 2017, 3:22 am

Another pic
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grantspain
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Re: Power supply 400-5261-01x blowing fuse

Postby grantspain » November 13th, 2017, 6:56 am

a fuse blowing is likely dead short, likely it could be bridge rectifier/diodes or transistor
Hrvat9
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Joined: April 26th, 2017, 3:47 pm
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Re: Power supply 400-5261-01x blowing fuse

Postby Hrvat9 » November 13th, 2017, 2:20 pm

grantspain wrote:a fuse blowing is likely dead short, likely it could be bridge rectifier/diodes or transistor


Most likely on the 5v rail? Or anywhere actually..
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Hrvat9
Posts: 92
Joined: April 26th, 2017, 3:47 pm
Location: Canada
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Re: Power supply 400-5261-01x blowing fuse

Postby Hrvat9 » November 14th, 2017, 4:35 am

Upon closer inspection as I was making a parts list I found a blown diode! Zd2 is in half. I took it out and tested it and it gave me .7xx so it’s still good , I put it back in circuit. Now I have somewhere to start looking from
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Hrvat9
Posts: 92
Joined: April 26th, 2017, 3:47 pm
Location: Canada
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Re: Power supply 400-5261-01x blowing fuse

Postby Hrvat9 » November 14th, 2017, 6:25 am

Diode at d9 reads .077 both ways, out of circuit it reads good (.500). Getting closer .. :problem:
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