I've got a fanuc lathe that it has been determined the board has at least one bad resistor as per the tech I am speaking with. Since they want $3,000 to replace this board new or $1800 for a used one I've done some testing, and have found 2 I'm confident are not within spec. My neighbor built boards for the health industry for years and is comfortable switching out the bad resistor, but I have to get it. I'm hoping to fix this board for $20 and a case of beer. So here is my problem and question.It is an older board built in 1987-89 range. It has 5 band resistors and all are with in 1 or 2% tolerance. They are light brown or white in color overall, so I believe they are carbon film capacitors. I've calculated which one is bad and checked it against an identical resistor on the board. I can't seem to find tan or white 5 band 1% or 2% carbon film capacitors online. Everything in that tolerance is a blue metal film capacitor, (which this board does also have a few of). Can I switch to a metal film capacitor? Where can I locate the appropriate carbon film one, or is it even still available? Do they even make 5 band carbon ones anymore? Color code is brown, black, black, brown, brown. The bad resistor has a white body, not a tan/brown one which is what most of the others are on the board. Maybe I'm just looking up the wrong thing altogether.
Thanks for your help! Bob
Thanks for your help! Bob