A590 troubles

[orange]

The harddisk won't spinup and the fan doesn't work either. It seems that +12VDC is not coming from A590PSU  :-(  (I measured +5V on two pins; does anyone have pinout? )
OTOH, RAM works fine.
What could be the cause?
Can I connect it to CD32 PSU to test?

[alexh]

Looking into rear of the A590 unit:

Code: [Select]


        u
      4   1
       3 2

    u = keyway
    1 = +5V
    2 = ground
    3 = power sense
    4 = +12V

It IS the same as a CD32 PSU and also pin compatible with C-64's 1541-II diskdrive's PSU.

If you wanted to do some soldering there is a way to make the A590 draw it's power from the A500

http://members.iinet.net.au/~davem2/overclock/a500hd.html

[Chain]

http://machina.amigahellas.gr/stuff/A590man.zip

original psu is weak, and some hd drives are power hungry, check it

[Chain]

alexh wrote:

It IS the same as a CD32 PSU and also pin compatible with

im not sure, but looking at schematics, grounding "power sense" isnt good idea, its actually one adress pin in A500

[Chain]

some info for clarification:

there is a 5V relay inside A590 psu
When a500 is powered up, powersense is 5V (negative signal for logical 0) and relay inside psu switches power to A590. Easy, and it works.