First of all, I don't expect I'll be able to get a definitive answer because of the limited information I'll be able to give, but here goes. I have a Fadal CNC mill that had in it a servo amp that was failing. I replaced the amp with and would like to figure out what is wrong with the original amp. The amp is made by Advanced Motion Controls. They do not offer schematics for the amp. None of the devices on the circuit board can be identified by a part number because Advanced Motion Controls ground the tops of all the devices to remove any identifying information. The problem with the amp is that it will not work until it's warm enough. So some device or devices must be a minimum temperature before the amp will work. Once warm enough it works perfectly. I thought I would try warming as small an area as possible and move the heat source around to narrow down the search area and then use cold spray to see if it is just one component. What kind of devices need to be warm enough to work? And if I do narrow it down to just one device what are some of the things I can test for? I cannot compare test points with a known good amp because all the other amps in the machine are a different brand as is the new one I just bought. I think it's probably hopeless for someone like me who knows little about electronics to find out what the actual device is but I do like to figure things out and learn a little bit more. Thanks, Eric
- posted
12 years ago