[rescue] Sun T5240 power supply failure?

[Peter Stokes]

Hi Arno

The PPS (Peripheral Power Supply) on the E3X00 was always a a weak point, had
several which just packed up. The E3X00 was always hard to find a replacement
for, but I found that the E4X00 was exactly the same PSU, you just need to
transfer the front plate and switch assembly over from the dead one. The E4X00
were always plentiful, maybe not so nowadays.

Peter
---------------------------
Peter Stokes
Ashlyn Computer Services
Mbl: 07977 532320
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On 1 Mar 2016, at 06:55, Arno Kletzander <Arno_1983 at gmx.de> wrote:

> Message: 4
> On 02/28/2016 23:13, chris t wrote:
>> Anyone else see this sort of thing happen? I'm pretty spooked, to be
>> honest.
>
> Never had my hands on a T series yet, but I had a PPS(?) module (the
> oblong rectangular power supply block without IEC inlet) on a Ex000
> class machine go "bang" on me upon powering the machine up. It had
> been working the day before, so not the usual capacitor breakdown
> after years of no use. I still have it there, waiting for repair; a
> MOSFET on a heatsink was blown apart and the inrush limiter resistors
> now measure open circuit as well, and the breaker in the distribution
> box had tripped.
>
> Other than that, a small APC UPS (420?) shot a shower of sparks
> out through its venting holes when I attempted a cold start (without
> mains power available). Replaced two fractured MOSFETs and had
> the thing work again for a couple more years before it started to go
> crazy one night with beeping and clattering of relays. I've been
> after that problem on and off for a couple of times now as I really
> liked that unit in the place where I put it (I had my VHS machine,
> my satellite receiver and my game consoles on it through a IEC-to-
> socket strip cable) but no success yet. When the unit is cold,
> it will work for about a day and a half, then do the same dance
> again; spraying the usual suspect components with cold spray did
> not restore function so I don't know where to start.
>
> So long,
>
> Arno
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