Robotron PSU: How much current can it handle?

Trying to run a Mario Bros and the 500-600 mA that it needs is drawing the -5 down to -4.3.

Seems like my PSU is weak. I just replaced the 7905. What should I check next?
 
What kind of heatsink do you have on the 7905? It won't get anywhere near 1A of current without a good heatsink.
 
There is no heatsink on it, standing upright. I think this is the standard Williams PSU configuration.

But does the 7905 regulate it's temp or just try to draw the current it needs until failure?
 
If you have replaced the 7905, I would replace the capacitors in that circuit and also remove the fuses, test continuity and clean the fuse clips and make sure they are tight when the fuses are snapped it. They should snap in not kinda sorta click in.

The fuse clips are subject to corrosion and that will reduce the amount of current the PS will be able to draw.

ken
 
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