(Topic ID: 244115)

EBD switch matrix ghosting tilt.

By oilspot

4 years ago


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  • 12 posts
  • 4 Pinsiders participating
  • Latest reply 4 years ago by Cheddar
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#1 4 years ago

Anyone else had this happen? When the "3x" target is down and the "D" rollover is closed ,Tilt!. Now ordinarily I'd look at the switch matrix and see what switch is in the fourth corner of the square drawn by "tilt", "3x" and "D", and check that diode, but there's nothing there!

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#2 4 years ago

Look for the cabinet switches on the other schematics page to find the missing switches.

Annoying the way Bally did this.

#3 4 years ago

Does the tilt end your game or kick the next ball?

#4 4 years ago

While they don't seem to fit into the missing space on the switch matrix I would check these 3 diodes.
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#5 4 years ago

The tilt is like a normal tilt, sound/speech and next ball kicks out after. . I will give these switches a look, thanks!

#6 4 years ago

Someone already did the work of filling in the switch matrix here: https://www.pinitech.com/switch_database.php?name=Bally_Eight_Ball_Deluxe

I think the Coin 1 Left switch is stick closed

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#7 4 years ago

In my diagnostic work last evening I went over the diodes on the tilt mechanism and coin door, even unplugged the coin door after starting a game and POP first thing hit on the pf awards a credit still. Now this isn't that bad a problem to have with a home use machine, it always ensures a credit is on it, but it's annoying. This machine has bigger problems which i'll turn my attention to and revisit this after it's sorted better. Thanks all for the info and clearing up the Bally matrix!

#8 4 years ago

Still got a couple slam tilt switches to check, but I started a game and then unplugged the coin door completely and the problem is still present. I've tested all the diodes related to this part of the matrix and they all test good. So for now, In stumped.now another problem has popped up where all three pop bumpers fire together in play and in solenoid test but I dividually when the transistor tabs are grounded manually. I suspect header pins and connectors between mpu and driver or possibly a PIA. But that issue will get its own thread if I can't solve it... Anyway, thanks for clearing up the Bally switch matrix for me and getting me pointed right, I'll update if I fix it.

#9 4 years ago
Quoted from oilspot:

another problem has popped up where all three pop bumpers fire together in play and in solenoid test but I dividually when the transistor tabs are grounded manually. I suspect header pins and connectors between mpu and driver or possibly a PIA.

The pop bumpers are part of the group of sixteen "momentary solenoids" of which the MPU board can only select one at any time. This is due to the design of using a 74L154 one of sixteen decoder chip on the solenoid driver board (SDB). This problem is unlikely to be MPU/connector related - more likely something local on the SDB potentially with the U2 74L154 decoder or U1 CA3081 transistor array.

#10 4 years ago

Ok, I feel a little stupid but I think I figured out what was causing the multiple pop bumper firings. I had just finished working on them and had the switches set on a hair trigger. When the first one popped it set off the others....duh.

#11 4 years ago

I may have the tilt issue licked too. I just cut the cap off the tilt bob switch and it now seems to be okay. At least for the couple games I have on it.

#12 4 years ago
Quoted from oilspot:

I may have the tilt issue licked too. I just cut the cap off the tilt bob switch and it now seems to be okay. At least for the couple games I have on it.

It would be interesting to see what a shorted cap does to the switch matrix square theory

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