(Topic ID: 195111)

Stern Switch Matrix Question

By GPS

6 years ago


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  • 26 posts
  • 3 Pinsiders participating
  • Latest reply 6 years ago by tonyhoff1
  • Topic is favorited by 1 Pinsider

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#1 6 years ago

Hello All,

I have a switch on my Stern Austin Powers which is not registering on the switch test. The switch in question is # 38, which is the right roll under switch (right ramp exit).

As mentioned, I cannot get this switch to register on the switch test. Now I can get switch # 34 to register and this is in the same column as my non-registering switch. I can also get switch # 6 (left coin slot) to register which is in the same row.

I disconnected the switch (#38) where it plugs into the wiring under the playfield and shorted the two connector pins out and still no confirmation of a switch closure being seen by the CPU.

This is where I need to have some help fro those far more skilled at this than I.

Appreciate all assistance. Thank you

George...

#2 6 years ago

Check continuity of the wires to the working switches. One wire should be the same color as all others in the row, and one in the column.

#3 6 years ago

I think I understand your suggestion and when I do this, I cannot get continuity in either wire? This makes me think I may be doing something in error as it seems hard to believe that both wires would not have continuity.

#4 6 years ago
Quoted from GPS:

I think I understand your suggestion and when I do this, I cannot get continuity in either wire? This makes me think I may be doing something in error as it seems hard to believe that both wires would not have continuity.

try it on a switch you know works to make sure you're testing it right.

to be more specific, every switch on a single column should have the same wire (white-?) connected to it, and they should all have continuity to each other on that wire. Same for rows with green wires.

If you get continuity right for another good switch, but are missing both on the bad switch, I'd wonder if there's some plug that's come disconnected since it seems unlikely that both wires would be broken

#5 6 years ago

I could be totally out in left field here but how about this as a possible troubleshooting idea. Using a jumper wire, connect the two wires in the non registering switch directly to the appropriate colors on a known working swicth and then rerun the test and see if the cpu will then register the switch closure. I would think at this point provided this resulted in the cpu seeing the switch that there is a snafu in the wiring harness somewhere. What ya think??

#6 6 years ago
Quoted from GPS:

I could be totally out in left field here but how about this as a possible troubleshooting idea. Using a jumper wire, connect the two wires in the non registering switch directly to the appropriate colors on a known working swicth and then rerun the test and see if the cpu will then register the switch closure. I would think at this point provided this resulted in the cpu seeing the switch that there is a snafu in the wiring harness somewhere. What ya think??

That would basically accomplish the same thing as the continuity test, so yeah if you jumpered both wires and it worked that would help narrow the problem down. I always prefer tests that aren't 'live' (on a powered on machine) but doesn't matter that much

#7 6 years ago

Thank you Zacaj

So let me make sure I understand you. Connect The like colored wire from the switch to the row on a known working switch and the like colored wire on the column to a known working switch and then see if that switch is recognized by the machine. Sound right?

#8 6 years ago
Quoted from GPS:

Thank you Zacaj
So let me make sure I understand you. Connect The like colored wire from the switch to the row on a known working switch and the like colored wire on the column to a known working switch and then see if that switch is recognized by the machine. Sound right?

Yep. Each clip should be on the same colored wire on each end

#9 6 years ago

Ok, stupid question. If I put a volt ohmmeter across that switch, should I see a dead short when the switch is closed

#10 6 years ago
Quoted from GPS:

Ok, stupid question. If I put a volt ohmmeter across that switch, should I see a dead short when the switch is closed

Yes

#11 6 years ago

Sorry. The diode is throwing me for a loop. Would think that I should see 0 ohms when the switch is closed and infinite ohms when open. Right??

#12 6 years ago
Quoted from GPS:

Sorry. The diode is throwing me for a loop. Would think that I should see 0 ohms when the switch is closed and infinite ohms when open. Right??

Ignore the diode and put the meter in on the two lugs that are on the switch blades. The diode should be going from one of those lugs to a third lug, and that lug should be ignored when testing.

#13 6 years ago

Thanks for hanging with me zacaj

Placing the ohmmeter on the two wires coming from the switch. Closed, the meter should read 0 and open the switch should read infinite. Correct

#14 6 years ago
Quoted from GPS:

Thanks for hanging with me zacaj
Placing the ohmmeter on the two wires coming from the switch. Closed, the meter should read 0 and open the switch should read infinite. Correct

No, one wire is coming from the third side lug that the diode goes to. You want to ignore that lug and use the two that are connected to the leafs

#15 6 years ago

Ok. Understood. There is a common on the switch and a normally open and normally closed. The switch is operating correctly

#16 6 years ago

This is where the switch ties into the playfield wiring. It changes to an orange and lighter guage blue. Just FYI

image (resized).jpgimage (resized).jpg

#17 6 years ago

You sure the plugs aren't swapped? Seems strange that it would switch to a more generic color. Sometimes the switch might have generic colors but not the playfield

#18 6 years ago

I don't know. I think I'm going to make a call to Stern on Monday and see if they can help me with this. The switch is definitely fine. And all other switches appear to be working so I'm hesitant to start swapping connectors for fear of making the situation worse

#20 6 years ago

That definitely looks like a flasher connection to me.

#21 6 years ago

If you look close in that pic the connector behind it looks like it should be connected to the one your talking about and vise versa

#22 6 years ago

Job to y

Very possible as the connectors are the same. I will look at this when I get home and report. Thank you very much

#23 6 years ago

Meant to say Hello tony. Sorry. Auto correct

#24 6 years ago

Hey buddy. Yes definitely check that out. From what I see that is the problem sir.

#25 6 years ago

And the prize goes to tonyhoff1. You were dead in. Somehow at some point those two connectors got transposed. I switched them and now all is well. Thank you very much tony and Zacag for all your kind help. I am grateful

George

#26 6 years ago

I'm glad you figured it out. Now you can enjoy the game.

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