Really Andy? There are a couple of overlapping 1/8" diameter holes burned through the board where the transistor mounts. Besides replacements should already be ordered.
Strain from the heat sink sounds like a good excuse. The drive isn't mounted in the ideal orientation. They should be verical and these are horizontal. From time and heat the pcb is visibly warped and sagging between it's mounting points. Unfortunately I'd have to replace the whole cabinet to fix it. Sent from my Verizon 4G LTE smartphone -------- Original message -------- From: andy pugh <[email protected]> Date: 8/20/18 5:58 PM (GMT-05:00) To: "Enhanced Machine Controller (EMC)" <[email protected]> Subject: Re: [Emc-users] Servo Failure On 20 August 2018 at 22:26, Todd Zuercher <[email protected]> wrote: > Other than being old, what would be the most probable cause of such a failure? My guess would be that thermal cycling of the heat-sink has cracked the track on the PCB, and once it started to arc across the gap things would go downhill pretty fast. But that's a guess. Repair is not impossible. I had a similar PCB fire with an STMBL and managed to repair it. https://photos.app.goo.gl/76JSesUMGi65fFBPA I cleaned out the carbon, painted the bare FR4 with nail varnish and replaced the missing tracks with wires (some floating in air connected only to component pins). Then I ordered 50 replacements :-) -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
