I've struggled with the cannon on my AC/DC Pro for quite awhile, not firing. I thought it might be a bad sensor or as GatorDad pointed out, screws protruding from the swing arm.

But what i'm noticing is that the ball is getting stuck under the cannon... and when I take examine it there about a quarter inch of play, meaning I can lift the cannon about a quarter of an inch and the ball passes through.

I then noticed that there is some sort of plastic washer underneath where the cannon mounts to the motor post with the 4 screws. That plastic washer seems to be just laying there loose and not doing anything. Is this factory or did someone add it?

My thinking is that the cannon is sitting too low, is catching the ball, and is also making the swing arm pass through the opto incorrectly. If I move the cannon post up an down it also moves the curved opto arm up and down. Hope this makes sense. I can take a pict if needed. Thanks!

I think my problem is one of these parts, or both being worn out. (Highlighted in yellow). Where can I order these?

acdc.jpg

Thanks Bills, I called them today and he thinks I may be on the right track. Problem is they don't sell directly, only through distributors, so the part that they sell for Marco for 50 cents will probably cost me $15 plus shipping. Might call betson here in Baltimore. It may just be a plastic washer but the title "Cannon Bearing" makes me think theres more to it.

I'm getting close! Spent about 3 hours yesterday messing with it. I found the bolt that lets you adjust the height of the arm to make sure it passes through the opto correctly. I had it working with the glass off, when I put the glass back on it stopped working again. Weird. I think its just a matter of getting the alignment correct.