Power Tower PSU question

[tonyvdb]

Hi Lurkist,

Maybe this will help. Here is the pinout voltages for the ATX power supply if you place a jumper across pins 14 and one of the other ones (just cant rember what one) and that will power it up so you can test all the pins.

[lurkist]

Amigakit - That`s a lovely offer, but I need one with a full set of connectors for CD-R, CD-RW, floppy and 3.5" HD.  I just thought the least troublesome way to replace a Power Computing Power Tower PSU would be with - quote "Original Power Supply Unit replacement for all our A1200 Power Towers".  Much appreciated, though.

TonyVDB - The unit(s) power up fine, just not with any load higher than a floppy drive.  Jumpering is not neccesary as the ATX-AT converter(s) have a push-on, push-off switch (confirmed working).  Plus I have no test gear!

Any thoughts on the 4-way square connector?  What is its function on a PC-mobo?

[Zac67]

The square 4-way plug was introduced for the current-hungry P4 and is nowadays also used on Athlon64/Opteron mobos (previous Athlon generations often suffered from 3V/5V rail PSU overloads) - you don't need it at all.

I'm pretty sure the pinout of your adapter is wrong: what you are saying (short flash of the LEDs, fans making some turns) sounds extremely like a short. The PSU detects overcurrent on powerup and shuts down again immediately. Does the setup work with the drives attached, the ATX->AT adapter attached, but no mobo? Then again with the AT->Amiga adapter, but no mobo?

[lurkist]

It only works with a floppy drive and/or LEDs attached. NOT with CD-Rs or 3.5" HD (either standing alone or hooked to the IDE port).  It also works with the ATX-AT attached, and the AT-Amiga on top, but not with the mobo plugged in.  

It does seem like a short, but from where I cannot imagine, as all individual components are verified working.  The only thing I can think of is that the 4-way square could possibly need jumpering or something.

Sounds complicated I know, I dread speaking to P.C. AGAIN trying to explain the situation.  I fear that both PSUs are in perfect working order, but only when connected to a PC.  Their terms & conds state they won`t pay for return postage, so even if I get a refund I`ll be out of pocket and have had a 2 month delay for my troubles.

[amigakit]

Just checked - I have a spare AT PSU

It has 4x 5.25" connectors, 2x 3.5" connectors, 1x P8 and 1x P9

Its yours if it is any good for you.

[lurkist]

PM`d.  This guy is a GOD!

[tonyvdb]

Oh Ya' AmigaKit is the best.

[lurkist]

Here are the specs for the exact model(s) I had trouble with.  Maybe the more electrically inclined can spot any potential problems in the wiring.

http://www.enhanceusa.com/file/6_specification.pdf

[lurkist]

Posting this from my A1200, finally! WAYHAY!!

Extreme thanks to Amigakit whose donation of an AT PSU proved that all the gear was functioning correctly as suspected.

Power Computing have agreed to refund me, tails well and truly between legs.

[amigakit]

Result!

Glad it arrived - worried that post would be delayed with all these snow flurries that we are having ATM.

[lorddef]

Agreed that amigakit rock.