I have a new to me Nine Ball. When I bought the pin, the ball would kick out and drain properly.Basically the game played the way it should.
After getting it home, everything works except the ball launch and drain. All other solenoid and switches seem to work so far. I checked J1 pin 2,3,5 and re-flowed the solder on those pins. But no change.
Any thoughts on what I'm missing?

Yes, 3 balls and switches checked with a the DMM.

I checked each wire and diode in the switch matrix that you highlighted. Diodes tested good with a DMM and all wires were soldered good. I also checked for continuity to each switch and that was good also.

I got a regular mpu200. I'll give this a shot and report back. Thank you for the file!

I flashed the M2716 chips and at boot up the "spot all number" out hole keeps kicking. The Displays also show the high score but does not switch over to the last game score.

Gotcha, I adjusted the switch for the "spot all number" and now the ball launches and cycles like it should. But midway in game play, the game acts as if it tilts and locks up until the ball drains. After that...., ball kicks out, then scores and it locks up again. never seen that before.

I think that there is still something wrong with the switch metric. I spin the spinner and the game act as if it tilted.

I'm not familiar with the test roms for Bally/Stern. I have them for Williams equipment. Where can I find this?

Hey this file is great! It needs to be pasted or linked to the PinWiki site for sure.

So I burned the ROM, installed and found that I forgot to pull the pinball's out. I had error 10, 23, 40. Once I pulled the pinball's out, there were no more errors. Interesting enough, after experimenting to see what all the ROM will do, I swapped chips out and booted the pin up. I found that the pinball's cycled like it should. So now I have an unexplained fix to my problem.

All drops targets was up but the one. I never saw 01/02/03 troughs closed though.

I got some new issues that cropped up. And I probable will until I work all the bugs out. This time the game scores some point and hits switch 17, (top dead bumper) the score resets, adds more score to the game, then locks up until the ball drains.
I'm going to take a close look at the header pins on the MPU and re-pin the connectors to see if that makes a difference. There has been battery damage to the board at one time and was repaired before I got it.

I'm also in need of a 32 pin ribbon cable to replace the damaged one that goes to the sound card.

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After closer inspection, I'm going to replace the board with a Weebly board. and rebuild the damaged one and use it as a test board.

To catch this thread up to date. Changing the MPU did not make any difference so far. There must be a bad connection somewhere. At this time the pin will boot up just fine with a new Weebly MPU, but will not start a game. Using the test ROM in the switch test mode, with all drop targets up and no balls in the trough, I get a zero on the switch indicator and when pressed the switches show as they should. The trough switches do register as they should.

I've checked all connections and repined connectors on the MPU. So far, I am at a loss on what to check other than continuity from the start button wire to the MPU.

Edit: Continuity is good from the start button switch to the MPU.

I'll do it 1st thing when I get home today.

I didn't know that you buy an MPU with no chips. I got one with the chips that Andrew set up. But I will double check the dips.

I looked at the sheet that Andrew provided and I could not find a test of any kind on there.

Edit: Key word is "some of the other custom software on it has the enhanced switch test"

I took the other MPU and installed the test Rom. I touched every switch that I could find and none of the switches showed double numbers. I did however did find switches that do not register. It is switches 34, 38, 39 and the trough switches 33, 36, and 37.

Its the whole column that is bad.

Clipped all 8 diodes and they still don't register in the test.

Not quite sure I understand what your talking about. Am I trying to jumper the pins to ground because that don't seem to work. Or am I running a jumper wire from the Yellow-Red on the MPU to the Playfield?

Thank you for your explanation, I found the problem, but I'm embarrassed to say that it was my fault.. When I repined the connector the other day, I placed the wire into the wrong position on the connector.

I am up and playing pinball! I forgot to solder the diode on the trough switch, so it was making an iffy connection.

barakandl
I have spoken to soon. While I was trying to find the wiring problem. I was using the old board with the test ROM on it. I never could get your board into the diagnostic menu. Well I started having problems with the old board, so I put yours in. I still can not start a game or go into the diagnostic menu with your board. So I still must have something wrong or I messed up your board somehow.

When I push the test button, the MPU reboots.

OK, I found the test button that gets you into the diag menu. When I press all 3 trough buttons, it only shows one number. not all three. Hmm

Im looking at another connector problem. I'm using an Bally connector pinout to check the Stern pinout and I found a couple of wires out of place. There also is a white wire on the Stern connector that is not on the Bally call out.

Is there a connector pinout for a Stern out there?

Anyone have a picture of A4J3?

barakandl

Still not able to start a game. I think that I got the connector wired correctly.

Still not able to do a good switch test with the Weebly board. For some reason, it does not show multiple switches that are depressed, just single switches.

That is a cool function that you and Quench wrote! What games has that option and where is the test rom suite at?