Hi gang, you may remember a few weeks ago a fellow Pinsider was posting here with issues on his GTB Volley. The O relay won't fire or engage and thus, the ball won't kick out.

I think he got a little frustrated -- alot of it was just his newness to the hobby and not being able to read a schematic.

He reached out to me and I'm trying to help him. I'd love YOUR help as well. Although I can read a schematic fairly well now, I still do struggle with bits of it.

Below I've pasted what I think are the two pertinent pieces of the schematic and the Operating Instructions start-up sequence in the manual.

First, the symptoms:

Upon power up, he says the game score motor turns, the score-reels reset to zero, and all three target banks reset. That appears to take us all the way to Step 5 in the Operating Instructions in the image below. I should note that in order to GET to where we are now, he did some adjustments on the game, as before it was not getting that far through the start-up sequence. I believe he made an adjustment, he says, to the O and Q relays.

He says that he does have power to the flippers, but that O never pulls in (and obviously doesn't stay locked in). He says it's as if the score motor isn't turning long enough.

Here's where I'd like your assistance so I can help him. He does not have jumper wires to my knowledge, nor does he know how to use them. I was going to have him do the following:

1. Double-check that the outhole switch is cleaned and adjusted so that it's closing firmly when the ball is there.
2. Then check the O Relay and the Yellow+Red wire which runs the motor. Seems like if the outhole switch checks out, that's the next place to start because O should be actuating and that switch should be running the score motor.

After that, I'd like your help. I see the path through the NC switches at Motor 1C, Motor 2B and the Start relay, and assume I should have him check those next? Then I'm not sure about the far-right side of the schematic where it shows the NC switch on the Ball Count Unit and also the make-break switch with the red wire on AX. Do those last two also need to be checked?

One last point of confusion for me. The Operating Instructions startup sequence in Step 5 says that a motor 4C switch closes and actuates the ball return coil, which kicks the ball out. Why is that 4C switch not in the path below?

Thanks for your assistance.

Mark

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I'll have him re-check 2B. I had him check the switch itself the other night, but not the follower/cam interaction to see if it's opening too soon. One thing: Isn't 2B in the lock-in circuit? His problem seems to be that O isn't pulling in at all in the first place (meaning the lock-in path seems like it's not relevant, at least not yet). Can someone confirm my thinking?

Thanks, Mark - I'll also look at that path with 4C in it.

Just wanted to flag my question in the previous post, because it’s hard to see amid the tax.

Am I correct that I can ignore the O lock-in path, because O is not pulling it at all?

If that’s true, which part of the path highlighted do I need to focus on?

Sincere thanks to you guys!

Thanks, Mark. I've asked him to try these and will report back. So appreciate you on this site!

Ok, so I had him test what Mark suggested above as a starting point, and if he holds in the O Relay, the motor turns and he can get the ball to kick out.

So help me with my still-learning thinking here: If we can get the Ball Return coil to fire by simulating that O is pulling in, then the path to the Ball Return coil is not the problem, right? So we've eliminated that path (NC switch on O and NO switch at motor 4C), correct?

So then the problem must be in the O Relay path itself (since it won't fire at all). In that path, it's not the ball-return switch, since in the simulation it kicks the ball out. So that leaves everything (moving left to right) from the Motor 1C switch, all the way to the make-break on AX with the red wire? Is that correct?

What to check next?