On 17.07.14 04:57, Leonardo Marsaglia wrote: > Well, the big capacitors are screwed, but there are other caps and > resistors that are not mounted on the pcb but have terminals, I guess > that's worth checking. > > From what I could see there's one big PCB only, full of components. I will > have to remove it to check it if all the other components that are not > soldered are ok.
Ah, there's another thing to look for while you have it apart. The bigger the PCB, and the more massive any great big capacitors, transformers or coils on it, the greater the chance of a hairline crack in a PCB trace. Board flexing, due to machine vibration, can occasionally lead to copper track cracking. That failure mode isn't particularly consistent with humidity being a trigger (if I correctly recall the upthread discussion), but it's Murphy's Law: If you don't look for it, then that will be the problem, but if you do, it won't. So it pays to keep an eye open. Heck, there could be an intermittent connection on one end of a fat power resistor, e.g. vertically mounted so that it is more susceptible to mechanical failure due to years of vibration. It's good to blow out the dust and dead rats, and eyeball the thing very thoroughly. Erik -- For those with savings and fixed incomes, deflation is wonderful, but for those with debt, it is catastrophic since the value of the dollar repaid is greater than the dollar borrowed. ... borrowers are ascendant and central banks are working for them, not savers. In fact, savers are being plundered with super low interest in the name of promoting aggregate demand and maintaining inflation. - http://www.abc.net.au/news/2013-11-06/kohler-prices-want-to-fall-but-borrowers-wont-let-them/5072388 ------------------------------------------------------------------------------ Want fast and easy access to all the code in your enterprise? Index and search up to 200,000 lines of code with a free copy of Black Duck Code Sight - the same software that powers the world's largest code search on Ohloh, the Black Duck Open Hub! Try it now. http://p.sf.net/sfu/bds _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
