On 08-Feb-2002 Tony Duell wrote:
>> > > I don't have access to a "HP Apollo 725/50" because the PSU died
>> > > and is beyond repair :-(
>> >
>> > If it uses the same PSU as a 720, I might be able to get you one very
>> > cheaply.
>> Thanks for the offer :-)
>> I don't know if the PSU is the same, the HP P/N is 0950-2701
>> it's an ASTEC Model AA16510.
>> HP wants 251$ for a new PSU (IMHO more than the machine is worth) :-(
>
> Why do you think the original PSU is beyond repair? Unless it's
> physically broken in half or something. Most SMPSU faults can be repaired
> relatively easily (at least compared to logic board problems where there
> are custom chips to worry about).
OK, lets say the PSU is beyond repair for me and everyone else I asked.
This isn't one of those nice handfull-of-components PeeCee-PSUs. This
beast is about 40*15*15cm^3 and stuffed to the limit with components,
daughterboards and custom coils.
Even with a schematic it would be a pain to identify all the control
circuits. And I don't even know what input and output voltages
are supposed to be on the connectors... :-(
I'm sure it's repairable with a lot of time and many years of experience.
But neither I nor my fellow students have that experience.
> I'm assuming you're getting no output at all? Is the fuse OK (and if not,
> did it fail violently, shattered or blackened)? Any obviously burnt
> componnents on the PCB?
The fuse is OK, it's not that easy.
There is a charred diode, which most probably took some of the control
circuits with it. We replaced the diode and the PSU starts up but shuts
down again after a few seconds.
There is also a resistor inside, that obviously got to hot for years
(the area around is colored from the heat).
Therefore I suppose this PSU isn't the perfect fit for the machine anyway.
bye
--
Sanity is the trademark of a weak mind.
-- Mark Harrold
Received on Sat Feb 09 2002 - 06:36:35 GMT