(Topic ID: 265032)

Firepower puzzler - Switch Matrix


By fattdirk

3 months ago



Topic Stats

  • 12 posts
  • 5 Pinsiders participating
  • Latest reply 3 months ago by fattdirk
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#1 3 months ago

So I'm stumped on this one. I just picked up a firepower and the thing plays fine except I'm getting some phantom switch hits.
When I hit the 1-6 targets I end up getting a ton of points. It just keeps counting up both hundreds and 10's for a little bit then will stop. The odd thing is when I go into switch test and manually activate every switch on the game they all work perfectly. No phantom hits show up.

Here is what I've done so far.
1. I recapped the power supply. I was getting decent voltages but figured I might as well replace the original caps.
2. Swapped the MPU with a rottendog board since I had one laying around just to rule out a board issue which didn't help.
3. Examined every switch on the game to make sure none had a really close gap and were just vibrating closed due to game play
4. looking at the wiring for each switch to identify any abnormalities.
5. Tested the flipper diodes to make sure they were good.

Any help would be appreciated.

#2 3 months ago

Remove the balls.
Enter switch test.
Switch test should indicate all switches open by not displaying anything.
Actuate the 1-6 switches one at a time. Each switch closure should indicate only that switch being closed.
What switches are reported closed?

If only the closed switches are reported, place the balls into the trough/loading area.
Retest.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#3 3 months ago

Nothing active with balls out.
Then 1-6
17
18
19
21
22
23

Same with balls in except it reports 58 57 then 51 when test mode is entered initially.

#4 3 months ago

I’m not familiar with the game. Are there capacitors on the targets? If so, try taking them out of circuit and see if the problem goes away. If it does, replace with new caps.

#5 3 months ago

You can't put capacitors on switch matrix switches on a williams game like you can on bally/sterns - it will continuously score with the first hit.

Ask me how I know this

#6 3 months ago
Quoted from Nokoro:

I’m not familiar with the game. Are there capacitors on the targets? If so, try taking them out of circuit and see if the problem goes away. If it does, replace with new caps.

Nope. No caps.

#7 3 months ago

It's just so odd. If I hit the switches individual it works fine but then if I play it even just throw the ball without using the flippers the scoring just runs away.

#8 3 months ago
Quoted from fattdirk:

It's just so odd. If I hit the switches individual it works fine but then if I play it even just throw the ball without using the flippers the scoring just runs away.

When you are hitting the switches individually, is that in switch test mode, or have you also tried it in game mode?

#9 3 months ago

Take 1 ball out of the trough and then try the test again

#10 3 months ago
Quoted from fattdirk:

Nothing active with balls out.
Then 1-6
17
18
19
21
22
23

Same with balls in except it reports 58 57 then 51 when test mode is entered initially.

This is all correct.
I've seen the stand-up switches "vibrate" back and forth, creating multiple target switch closures after one hit, because the "tensioner" blade on the switch stack wasn't holding the target side of the switch forward.

Posting a video would help us help you figure this out.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#11 3 months ago
Quoted from ChrisHibler:

This is all correct.
I've seen the stand-up switches "vibrate" back and forth, creating multiple target switch closures after one hit, because the "tensioner" blade on the switch stack wasn't holding the target side of the switch forward.
Posting a video would help us help you figure this out.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info

I bet they are vibrating. Looking at them they have no foam installed. I'm going to try installing some foam.

#12 3 months ago

This is exactly what's happening. The targets are vibrating causing multiple hits. I'm retiring my technician card.

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