Post by Juho on Sept 29, 2021 9:01:02 GMT
So I just got my hands on this C128. The first thing I did was to check the health of the PSU. And for a good reason, apparently as the voltage on DC line seems to be around 10 V.
As far as I could tell, the AC side of it seems fine. According to the label on the unit, it is a West-German 310416-03...
I was looking at the unit thinking about what would the best approach to fix this thing. Obviously my first idea was to find the defect and just fix it, but then I got this idea. What if I would just basically gut the whole DC side of it... The AC side of it consists of merely a couple of coil-transformers, and those should be reliable enough. So, if I just get rid of everything on the DC side, all I would basically need is a couple of capacitors and a voltage regulator to get nice and clean-ish DC 5 V out of it.
Any thoughts?
So far I have not tried to do any deeper diagnostics on it, and I have not found any documentation that would give actual specs at component level... But if I would take a guess, I think the AC transformers are feeding both the AC output and DC-unit at 9 volts... The 10 V on DC output is basically what one would expect with essentially just a rectifier and a couple of capacitors, the parts that sould be regulating it down to 5 V are clearly not working...