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If this thing were a car, it would have a rebuilt title. I put relays and a stepper back into a chassis that looked to be in good shape. I put it on a lane, and as soon as I turned the breaker on, the sweep ran to about 270 and the klixon kicked out, followed by the breaker. I tried a second time and everything happened the same way. When I pulled the sweep motor plug and tried a third time, I could hear the breaker humming, and after ten seconds or so it tripped again. It's pretty clear that I have a short in the chassis, so I pulled the connections on the sweep relay and used a meter to check them against a good chassis. Everything seems to be in good order and the wiring looks okay. Could this be caused by a diode that's conducting both ways? I suppose new boards would be my next step. I'm new to working on chassis, so any stepper insight would be awesome. Thanks!
Toby, I think I have the explanation of each step of the stepper as well as a wiring diagram for this chassis....if that will help. If this were a SS chassis I would say the 24v to the contractor coil is grounding causing it to run and (possibly) trip the breaker, but this is a different chassis so im not sure. And on the SS chassis, been awhile, but if the diode (varistor) goes you can have a continuous sweep or no sweep at all. If you want this stuff let me know.
Is the varistor a little black block with three terminals on it? I found one of those in each of our ball returns. What does it do, and how do I test it? I have both sets of schematics, but finding this stuff inside the chassis is a whole other ballgame.
Figured it out. After another evening with the meter, I found that two wires were switched on the relay. I might have done it, or it may have been wired improperly by another tech, hence they parted it out. This particular chassis was converted from an A-machine, so there's a lot of extra wiring to sort through. What a pain! Thanks, Tablejam.
Good morning, I have built a tester for the MP Chassis for the 82-70 machines. Instead of using the cam switches I am using relays. My question is to anyone that may...
Is anyone running the solderless relays on the accelerators? How do you like them? What brand? How difficult to convert was it? Would love the feed back as I'm about to switch...
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