(Topic ID: 129770)

Service Button Panel has short somewhere


By mrserv0n

4 years ago



Topic Stats

  • 14 posts
  • 5 Pinsiders participating
  • Latest reply 4 years ago by ChrisHibler
  • No one calls this topic a favorite

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#1 4 years ago

I have a BSD, All four service buttons work as individuals. Problem is randomly it will just start acting like they are being pushed as if your holding them down so it flies through the menus, ANd when your playing it says "open coin door to use service buttons" Because the game thinks Im pressing them..

Honestly the plug portion looks decent enough, all wires seem to be in their appropriate sockets and attached.

Same with on the Switches themselves. None of the solder points seem lose or too corroded. Its grounded correctly.

I tried giving some movement and cleaning it up a bit Sometimes it makes it makes the game unplayable, other times it wont do it for 3 games and just randomly start again.

The cable to the board is 13 wires. Are their any prebuilt units to replace this, I seen you can buy service switches but I don't know if the buttons themselves are bad since they work when pressed manually fine.

Suggestions?

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#2 4 years ago

Check CPU for battery damage first.

Check the switches to see if the lugs on them are shorted to metal. Check the coin door interface board to see if it has worn flipper crap on it shorting it out.

See if the switches need cleaning from old pop or beer.

LTG : )™

#3 4 years ago
Quoted from LTG:

Check CPU for battery damage first.

ditto.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#4 4 years ago

As for the battery damage on cpu board, The batteries are brand new in them takes 3 AA, no leakage, and no showing of former leakage prior to my ownership.
Sorry what is the "LUG" of the switch? This is my first pin

#5 4 years ago

And I assume the Coin Door interface board is the one I showed pic of with the 13 wire cable plugged into it? It looks in nice shape, and I take take off the cable and give it a wipe down. I just played 6+ games without it happening. Its strange. I'll probably replace the harness and service switches if the problem doesnt jiggle itself fixed.

Where can I buy the 13 wired connector piece? I found the 4 button service panel replacement already

Thanks guys

#6 4 years ago
Quoted from mrserv0n:

what is the "LUG" of the switch?

Where the wires solder on.

Quoted from mrserv0n:

Where can I buy the 13 wired connector piece?

Make your own - parts here - https://www.greatplainselectronics.com/

Figure the problem out though, don't just throw parts at it.

LTG : )™

#7 4 years ago

Hold on there mrserv0n...let's see a picture of the area just SW and West of the battery holder.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#8 4 years ago

Might be worth reseating the cabinet switch connectors on the mpu as well. I had a very similar problem with my BSD.

#9 4 years ago

20150607_091128.jpg

#10 4 years ago

Heres pics of mpu board that were requested.

So far I just wiped down and reseated the MPU connectors recommend above, I rehooked up the service button harness as well.

I just played for over 30 min without one coin door error. Which was impossible to do. I can open and close the door million times

Had to of been a loose or corroded MPU connector. Thanks soooo much.

#11 4 years ago

I'm interested in the solution of your problem. I have 1 button (+) acting really weird (+ or "Enter" depending of its mood) and I could not find any anomaly.

#12 4 years ago
Quoted from Leo13:

I'm interested in the solution of your problem. I have 1 button (+) acting really weird (+ or "Enter" depending of its mood) and I could not find any anomaly.

Define wierd for us.
Debugging info...
http://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Direct_Switch_Problems

The vast majority of direct switch failures are one of three issues...
1. Alkaline corrosion on the MPU. The ICs just left and down from the battery holder service these buttons.
2. Broken wires on the coin door switches themselves.
3. Coke/Beer/Whatever dripped down into the buttons.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#13 4 years ago

For me under the batteries in the photo is those 3 wire harnesses. I took them off and cleaned a bit of brownish corrosion off the pins and just put it back and on and it worked immediately. I played well over 2 hours today after this post and it didn't glitch on me once.

I would guess its the left most one thats labeled cabinet switches would be the one that caused it for me but not 100% sure

Chris, from the picture I took of mine can you see the ICs your referring to if mine look good?

#14 4 years ago
Quoted from mrserv0n:

Chris, from the picture I took of mine can you see the ICs your referring to if mine look good?

I had a look at them. They look fine. The are U14, U15, etc.
The only thing I saw in the pic was =perhaps= some corrosion on the 10K resistors below the center battery. But the pic was a little fuzzy. The legs of those resistors should be as shiny as all the rest.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

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