On Fri, 22 Jan 2016 19:07:54 -0600, Mark Zacharias wrote:

"Cursitor Doom" wrote in message
...
On Fri, 22 Jan 2016 19:24:31 -0500, JC wrote:

For goodness sake, this is out of the PM3264 right? So what happens
when you put it in the scope?

I'm reluctant to do this until I'm sure the psu won't toast it.

I can't find your original posts on this but these are not very
complicated supplies and pretty reliable. Main fail is the
electrolytic caps, all of them will be useless, Philips blue caps
suck, they were never low ESR in the first place and from your photo
it looks like you haven't replaced any of them.

No, because I've tested all of them with one of these:

http://www.peakelec.co.uk/acatalog/jz_esr70.html

and they all check out totally fine.

The hissing is probably the 1.5Kv from the transformer. Its a good
scope if you can get it working. Buy the manual.
http://www.jetecnet.com/

Thankfully I've now managed to get a circuit for the psu section off
the net. That will be a *major* help. I'll be happy to buy the complete
manual if I can get the thing at least partly working.




Do look for a short to (cold) ground on the secondary, and if you can
isolate and open up that short (like by removing the shorted zener, if
any) then bring it up briefly on a variac and 'scope the dc line(s) for
noise. Remember to use an isolation transformer when servicing the
primary circuit.

Mark Z.

Thanks, Mark. I'll try that in the morning along with a few other things
as it's getting very late here (1.20am) so I'm going to call it a day for
now.