Roadshow Pinball Dozer help needed

Reddogg

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Hey all, I've got something going on with my Dozer blade, and I'm not 100% sure what the problem is. It does register all hits just fine, but during game play it often raises up and down for no reason at all. I'm assuming it's either the Eddy coil sensor (part A-19237), or the Dozer's opto board.

It does function 100% in test mode.

I've searched but haven't found a definitive answer for the problem. Seems to be an issue with one of the 2 things I mentioned though.

Any thoughts?
 
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The eddy coil sensor is to register the blade being hit. Raising and lowering of the blade is from a motor control board if I remember correctly.
 
There is an eddy in front of the blade 'hit dozer' and one behind the blade 'hit ted'. Go into switch test and see if they both are operating correctly. The sensitivity of the eddy sensors are adjustable via a pot on the small control board, trace the sensor wires back to find the correct board. If the led is lit the switch is on. If the sensor behind the blade is falsely activating, the blade might think there is a trapped ball behind it.

I tested it and if I drop a ball behind the blade during game play, the dozer lifts up to free the ball.
 
The eddy coil sensor is to register the blade being hit. Raising and lowering of the blade is from a motor control board if I remember correctly.

Thanks. I went ahead and re-flowed the solder on the Dozer opto board, which I actually did when I got the machine last summer. We'll see if it fixed the problem.

There is an eddy in front of the blade 'hit dozer' and one behind the blade 'hit ted'. Go into switch test and see if they both are operating correctly. The sensitivity of the eddy sensors are adjustable via a pot on the small control board, trace the sensor wires back to find the correct board. If the led is lit the switch is on. If the sensor behind the blade is falsely activating, the blade might think there is a trapped ball behind it.

I tested it and if I drop a ball behind the blade during game play, the dozer lifts up to free the ball.

That's the other possibility I was thinking of too. Thanks for the suggestion. Everything does check out properly in test mode. I'll give it a couple of days, and plenty of games and see if the re-flow of solder fixed it. If not, I'll adjust as suggested.

Thanks guys!
 
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