HP25C repair, help needed

[teenix]

(01-16-2019 09:55 PM)albertofenini Wrote:  What can we check ?
What can we do to isolate PSU and try make it working ?
Can we use components from a Classic Calculator PSU ?
Also, does anyone has more detailed information specifically about the HP25C ?

As always, thank you very much for you precious support !!!
Take care !

You mentioned the capacitors were getting hot. I would replace those with new ones as they are probably unusable now. If they are faulty, then replacing other parts may not show any change in symptoms and could even damage them.

There are only a handful of passive components in the power supply plus the transistors. Checking each of them individually would certainly help.

cheers

Tony