paul400
Well-known member
trying to get this 4900 working, as you can see it needed some jumpers because of cracks on the board..capped it , looked for cold solder etc. voltage at the hot is 160vdc so.checked R363 tested good. R503 was 160vdc also. tested HOT and tested good. VR tested good. should i take some readings off the ic chip and if so what readings? what next to test?