I picked up a 475 on craigslist for $10. The owner stated it worked a couple years ago but when recently powered up, he "couldn't get a trace".
For $10, I figured it was worth the effort to fix it. I have experience fixing electronics and while my soldering/component testing/safety skills are pretty decent, my troubleshooting/tracing/etc is beginner level. Any help would be appreciated.
It came with a stand, the manual, two 10x probes (one missing the 10x pin, but otherwise intact), extra parts (probe parts, etc), and the service manual. It also has the front cover and styrofoam intact. So the unit appears to have been kept well over the years.
I've opened the unit up and everything is surprisingly clean there as well. I see a couple of spots where the solder appears slightly burnt (like a semi-poor repair job, but not terrible). I've tested most components in those areas (but not all yet) and they have been testing fine.
Nothing appears terribly loose and nothing appears to be bubbled or blackened.
One major thing I've noticed is that all of the voltage readings are low. I read that most of them reference the +50V line and so I followed the manual's instructions to adjust that first. The best I can get is roughly 42.3V.
To me, that says I need to review the power section before anything else. Am I on the correct track, or not? Also, any common failure point that would cause my 50V line to drop?
Thanks for the help. I can post pictures of those help. Otherwise just let me know what other info would be useful.
