I just bought a Target Alpha EM and on ball #1 it puts out a ball in play and when finished it puts out another ball, after the first ball none of the drop targets reset, it's like it has awarded you an extra ball and it does the same for ball 2, 3, 4, on ball #5 it only puts out one ball as normal. I would appreciate any suggestions.

Thanks, I checked those switches and they are fine.

It looks like the issue is that when the ball drains and enters and operates the ball return switch, the ball immediately fires into the shooter lane and on it's way operates the trough switch, so the "P" coil and Player Unit never operate because of how fast the ball gets shot into the shooter lane, this is the failure mode during the initial ball, the bonus unit runs and stops maybe in the 8th,9th,10th, etc position and never gets reset, all drop targets stay down and they don't reset, the 2nd ball is there waiting in the shooter lane, if you play it everything resets as normal, which I think is due to the fact that the bonus unit is already near the end of it's travel and it gets reset as normal, all targets reset and life is good. This scenario happens with each of the 5 balls. On the first ball of each series I can drop some targets manually then push the ball return switch manually, the P and Player Units operate and the bonus unit runs to it's stopping point, if I then push the trough switch everything works as normal so it appears to be a timing issue, the ball is shot into the shooter lane way too fast.

Here is the partial schematicScan--20190708.pdf

Yes, only one ball.

SUCCESS, Mark, The ball return relay was getting energized from the form C contact on the DX relay, I shoved an insulator in the normally closed contact after starting ball #1 and the ball return relay did not operate, it was a careful adjustment of that form C contact. Thanks to everyone for their suggestions and kudos to Mark. Tom