You can find tons of arcade switching power supply's on ebay.
Or use computer power supplies.
The old school power supplies that are in mis pacman:
- it could be the ac filter. Small box where you voltage comes in.
- If its the transformer, not worth repairing.
* clean it
* Check fuses
( If your fuse keeps blowing, I wouldn't bother trying to fix it.)
* check dead solder joints
* you can try and replacing the capacitors that are leaking or round on the top. (if its not fixed then i'm not sure it's worth further repairing.)
* If something is burned or smelling -> dead.