I have a full set of whatever the DIP chips are for the C1G. No, I'm just a self educated country boy...
http://cnc4pc.com/hardware/replacement-chips/c1g/set-of-buffers-and-optoisolators-for-the-c1g-board-rev-3.html says they are buffers and optoisolators. JT On 9/8/2016 8:34 PM, Gene Heskett wrote: > On Thursday 08 September 2016 18:34:33 John Thornton wrote: > >> Hi Gene, >> >> I'm afraid the technical details are above my pay grade. I can however >> help you with Mesa cards that relate to Linuxcnc. > Aw, gee, John. Aren't you a C.E.T. too? ;-) > >> My 5i25 >> http://mesaus.com/index.php?route=product/product&path=62&product_id=5 >> 1 >> >> I also have a C1 and a C1G and a pile of optos for them I'd be very >> willing to part with. Let me know what you need. >> >> JT > What do you need for the C1G? FWIW, there no opto's on a C1G. > >> On 9/8/2016 4:59 PM, Gene Heskett wrote: >>> Greetings Peter; >>> >>> Someone made the remark a while back that it was indeed possible to >>> look at the output of a function, in this case the first pwmgen of a >>> 5i25 with the prob-rfx2 firmware in it. >>> >>> I've had a blowup, the ultimate cause of which I have not found yet, >>> but from the damages done to the cnc4pc C1G BoB that I have found so >>> far, I am inclined to think the spindle motor psu, or possibly >>> something line powered failed. The C1G damages so far found are 1 >>> blown 74ACT245N, and an almost invisible use of a ground trace on >>> the pcb as a fuse. All the opto's in my spindle encoder would appear >>> to have failed. Those I have a bag of, but that pcb makes the >>> tinfoil of a pack of smokes look like boiler plate, so I'll have >>> something I won't call fun replaceing them. >>> >>> I can run the x/z motors just fine, but the limit switches would >>> appear to be closed as those leds are at full britness when its >>> several inches from the switches. >>> >>> What happened is that I had started a short program that called for >>> a 400 rpm spindle but had neglected to engage the headstocks back >>> gear, so the motor took off and wound out to max speed before I >>> could hit the big red button. And about 1/2 second before my hand >>> hit the button, there was a pop that came from the box over the >>> spindle motor and everything coasted to a stop. The pop sounded >>> like it could have been the top of one of the hexfets on the Pico >>> Systems PWM-servo amp I am driving the motor with. But they look >>> pristine, and all the other components in that box look good and a >>> DVM says they are properly powered. Thinking the motor may have >>> thrown a winding, I've looked it over and checked for shorts and >>> come up empty so far. >>> >>> Back to the 5i25 question. So I fire up the halscope and send it to >>> gpio1.in or in_not. And try to start the spindle from axis with the >>> cable to the bob unplugged. >>> >>> I am seeing a short pulse of 1 volt p-p, which becomes inverted if I >>> look at the in_not, and trying to increase its speed has no effect. >>> So its beginning to look as if I may have blown this 5i25. And I've >>> still no clue what did it. >>> >>> Do you concur, Peter? In that event, I'll need three more, with low >>> profile brackets as I believe the one I was going to run either my >>> toy mill, or this Sheldon lathe, has a bad pin that I was using for >>> the probe, G38.2, and it got flaky. That was because the big dummy >>> I can see in the mirror here forgot to run a decent ground to the >>> frame of my G0704. And it was pretty darned noisy when I put a >>> scope on it. Fixed, but too late for that 5i25. So now I need one >>> for the little monster, one for the Sheldon, and one for my toy mill >>> that I've not found a round tuit to do yet. >>> >>> Thanks Peter, or John T. >>> >>> Cheers, Gene Heskett >> ---------------------------------------------------------------------- >> -------- _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > > Cheers, Gene Heskett ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
