Macintosh Plus endless reboot (voltage problem?)

Hi all,
I bought a Macintosh Plus about an year ago: for the first months, everything was perfect, until something happened: the Mac continued rebooting. Thinking it was a dead PRAM battery, I ordered it from U.S. and replaced it, but the problem wasn't solved: I managed to know it was a voltage problem. So I tried to fix the 5v line on the hole on the right side (after checking the low voltage from the floppy drive port, in fact it was 4.5 instead of 5). The REAL problem is: the voltage hole fixes not only the 5v line, but also the 12v one, so when I bring the 5v to his normal state the 12v line becomes 13v if not more (Apple says it should be between 11.90 and 12.75). How can I fix the 5v line without "affecting" the 12v one? It's a bit complicated, but I would be glad to re-explain this a thousand times. Thank you all,
tommijazz91
P.S. PLEASE show your e-mail if you want pm: in the previous post I couldn't contact a user because of this! Thanks.

I have a few Plus machines, the power supply is fun to fix. There is a very good tutorial on how they work, pm me and I'll send you a copy.
Basically, the power supply is all linked so adjusting one rail (12V or 5V) changes them all, there is no separate adjustments possible. Also be aware the EHT on the CRT is derived from the 12V rail so turning up the 5V rail will also increase the very hight voltage on the screen which is not a good idea.
There may be a component failure on the power supply, I have repaired many, the doc I refer is superb.

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