This is on a Secret Service.

IMG_20200109_163924 (resized).jpg

Even with that middle button not functioning, you should still be able to get into adjustments. You just have to scroll past the audits (I think there's about 50 of them). I'd recommend scrolling to adjustment 47, and restore factory settings. That will rule out some setting somewhere that's causing this.

I think Williams System 11 does this. I don't think I've seen Data East games do this.

The three button configuration is a direct copy (rip-off) of System 11. I don't believe the "third" button is wired up but if it is it should be wired to "reset high scores".

Try the following:

Short the BLU (blue) and WHT (white) wires at the switch (use an alligator clip or something like that). Then press the "first" button.

If this is too difficult to do then remove the appropriately colored pins from the Molex connector to the coin door and short them there.

Alternatively you can disconnect CN14 at the CPU board and short the wires at the connector. To enter audits / adjustments you will need to short the GRN (green) and WHT wires.

It did this on my Secret Service. But it only had the two buttons, so maybe it was a one-off hack job....

I'm new with the repair of my Laser war pinball machine. It won't let me reset a new free play. It displays "missing ball" even though all 3 balls are in the machine. Any suggestions.

You might want to start your own thread, so you can get views specific to your issue. But in the meantime....

If you don't have a manual, here is a link to it:

https://www.ipdb.org/files/1415/Laser_War_manual.pdf

Remove the balls from your game.

Page 14 gives instructions on how to enter game diagnostics. The FORWARD/REVERSE button should be the one that you can click "down" then unclick "up" (like a ballpoint pen) and it should be in the middle (if you have three buttons). Setting it to "down" is the same as "reverse". So set it to "down" then hit the STEP button (Which I think is the one farthest from the coin door) until you get to SWITCH TEST. In SWITCH TEST, any switches that are "active" will be displayed on the Player 1 & Player 2 display (switch title), as well as the Ball In Play display (switch number).

On page 17 there is a diagram of the switch matrix and on page 18 there is an image of where those switches are located on the playfield. Manually press switch #52: Shooter Lane and see if it is noted on the display. Repeat that process for switches 10-12: Ball Trough 1-3. Any switch that doesn't display when you manually press it needs to be addressed.

My guess is that one of your trough switches is bad (broken wire, bad switch, etc.).

Thanks for the advise I do have the Instruction manual and I will go through the steps recommended this weekend. Hopefully that will fix the issue Thanks and Cheers