A3000 without -5V ?

[fragment]

My PSU in my A3000D is dying and needs a replacement. Unfortunately many new ATX PSUs do not have the -5V line. According to the A3000D schematics it is connected to the external video port and the Zorro/ISA slots.

I have one slim ATX power that would nicely fit in the case but the problem is I do not know if it will work. Does the A3000 need the -5V for something else as well? And will Deneb work without it?

[DoogUK]

This page might be useful to you.

http://www.ianstedman.co.uk/Amiga/amiga_hacks/Amiga_Power_supplies/amiga_power_supplies.html

[fragment]

It is very good for general information but unfortunately does not answer my questions.

[DoogUK]

i always thought the -5v was supplied along the grounds.


According to the guide -5v IS present in atx supplies

[fragment]

It became optional since ATX revision ATX12V 1.2 therefore not all ATX PSUs have it. (And after v2.1 the -5V was removed completely)

[DoogUK]

Ahh i see....what about using an AT supply instead? would solve all your problems.

[fragment]

Not all, first I would have to find one that will fit nicely in the case  :-)

[DoogUK]

I've seen a few people on a2000's have stripped the original parts out of the power supply case and replaced them with AT/ATX's, i'm not familiar with 3000's but could that be an option for you?

[fragment]

Sure, but most of the AT/ATX PSUs are too big for their insides to fit inside the A3000 PSU which is quite small.

[adolescent]

http://www.amiga.org/forums/showthread.php?t=39419

Sounds like the -5V is just for the ISA slots.

[fragment]

Thanks! I had missed that thread. Gonna try without the -5V then..

[DoogUK]

let us know how you got on!

[fragment]

It seems to be running nice and stable. Now I just need to attach the PSU properly, attach the AC plug in the back of the case, add a 80mm case fan and connect the power button nicely  :crazy:

A photo of what it looks like at the moment. Mmmm, Dell. I lost a drive bay but that isn't a big issue.