Posted By
MMS
on 2018-06-26
15:50:09
 |  Re: Plus 4 Psu
I think the Plus/4 PSUs are not so bad as the C16 (it was really too weak for the task, so THAT was awful). 
ZX Spectrum ones were much better.
Plus/4 and C64 PSUs are identical inside. Some ppl know bad stories about C64 PSUs, and I think the main reason is the overheating.
Maybe the warmup is due to the epoxy/resin they used inside (I think it is more a heat insulator, than a heat conductor). Maybe it plays a major role in the defective (overheated) components too.
It made the defective PSU non-repairable, and maybe it was the target, I mean to buy a new one from Commodore if get failed. It was one of the most expensive component of the computer, close to 10€ (as raw material).
Here you can see how PSU looks inside, and here find an alternative one, this is exactly the same as the Plus/4 needs.
https://wej.k.vu/broken_stuff/c64_power_supply_repair/
I have some experience from the secondary school how to build such a thing (I have a profession from power electronics, even hand made a working transformer  ), but I am sure I will never do myself such a thing again, as my life it too precious to me  (eg. I have no high voltage tester at home...)
So yes, I highly suggest to buy a new one from the mentioned professional team, or Ray Carlsen, who offers really robust Commodore PSUs will work for next 3 decades. (but his ones are for 110V)
forum/27823#29370
http://personalpages.tds.net/~rcarlsen/cbm/universal_ps/misc/
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