On Tuesday 01 December 2020 16:22:30 Todd Zuercher wrote: > Unfortunately the wiring is very simple in this machine. (It's just a > small sign router.) There is a main control board, with a couple of > daughter boards (one for coms the other is the main brain) the encoder > cables are plugged into the main board, as are the limits, and some > other misc IO. Then there are 3 ribbon cables one for each amp. That > it. I've checked the integrity of the ribbons and they all seem fine. > There isn't a bunch of individual wires anywhere that one could come > loose and cause this. The amps only have 4 other wires 2 for the > motors and 2 for the DC supply. > How about dirt or debris on either side of these boards? Pulling them out and applying a 100+ psi air hose might dislodge a short, and while they are out, get a strong camera lens and look for cracked solder around where their plugs are soldered into the board. One old molex connector that had a nylon gizmo sticking up beside the boards pins as a retainer helper was infamous for breaking the solder joint, or even loosening the pad to board glue and then breaking the foil of the pcb trace exactly at the edge of the solder blob. Very hard to see w/o that good strong lens. The only fix for that is to clean (scrape) the resist off the trace leaving that joint, wrap a piece of light wire around the pin and extend it out to lay on the cleaned copper trace and solder it all. If the pin can then be wiggled, wiggle some superglue under it so its glued to the board again. And burn the offending piece of nylon off the connector. Its better off w/o it.
I hope this helps Todd. > Todd Zuercher > P. Graham Dunn Inc. > 630 Henry Street > Dalton, Ohio 44618 > Phone: (330)828-2105ext. 2031 Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
