Fluke / Philips PM6680B universal counter/timer repair (x2 !)

A fairly routine late-90's-gear repair. Two almost identical units; same failure mode. IMO this didn't deserve a 30+ minute video and I edited the video accordingly, had to cut out many tedious bits. Hopefully it doesn't make things too confusing. Calibration on these, unlike the PM6681B, does not depend on the RAM backup and does not require special software and equipment to perform.