IBM 5155 Power supply schematics or info

[Alberto Rubinelli - A2 Sistemi]

> Do you have anough load on the _+5V_ supply? Remember, these supplies
> regulate the 5V output (that's the one that's fed back to the error
> amplifier on the 3524 chip), and the other outputs follow along. If you
> don't give the 5V supply enough load, the supply doesn't have to 'work
> very hard', and the other outputs tend to be low.

I have loaded all the outputs : on +5 the load is about 3A.
I have try to increase the load, but no effect.

> Alos check the output capacitors. A dried up one will cause all sorts of
> problems.

All the electrolitic capatitors were replaced, was the first thing I do.

Without undervoltage protection for +12 and -12 the power supply work, with
load, I've tested it.
But isn't a solution bypass the protection :((( I don't want .

Alberto
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Alberto Rubinelli          Mail : alberto at a2sistemi.it
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