This week's test gear repair short story:
Scraped up a Keithley 199 System DMM (without the scanner board) for $50 plus shipping. Not in great shape, but still...
"does not power on" ...spin the wheel, roll the dice!
Looks nice and clean inside. No obvious destruction.
But turning it over....
Looks promising! In a bad, yet good way.
Fix fix...
And a bit of recapping here and there. All of the small electrolytics were reading 5-10 Ohms at a range of frequencies. Dry. The big ones were all ok.
Quick check that things are going to plan...
A good clean and reassembly next. Some basic tests for ohms, volts.
Overall, worth the small amount of cost and trouble. And more fun than the other things I had to do today.
A few notes:
The board and pads were damaged by overheating pins, caused by dry solder joints. These pins were badly oxidized and would not take solder. Using flux wasn't enough - I had to grind the sides of the exposed pin. The board in this unit is also very easily damaged by heat and I found acetone quickly strips the green coating from the board so only ISO is safely usable. This all took longer than it really should have and wasn't as tidy as I would have liked. I'll need to look into better ways of recovering oxidized/corroded/burned pins as it has become a bit of a theme in recent repairs. I have been dealing with a Tek 7613 PSU with similar problems on the solder joints of some header pins.