(Topic ID: 206393)

Scared Stiff some switches become flaky after a while


By mgpasman

1 year ago



Topic Stats

  • 7 posts
  • 5 Pinsiders participating
  • Latest reply 1 year ago by mgpasman
  • Topic is favorited by 1 Pinsider

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#1 1 year ago

I noticed that when I leave the game on for several hours, at some point, some of the switches become flaky. Most noticeable are the crate, the opto in the Bony Beast ramp and the start button. If I enter switch test, it takes 4 button presses to register one. Those switches are not on the same row/column.

At first, I could leave the game off for some time to fix the problem. But this morning when I wanted to retest, the start button was flaky from the beginning. I also notice that during switch test, the crate does not register anything when I tap it. During gameplay, it does register.

I tried re-seating all connectors related to switches, as well as the flat cable between the CPU and the driver board, to no avail.

#2 1 year ago

How's the voltage? Sounds to me like you may not be getting good voltage on your switches. Do you have a DMM available to measure?

#3 1 year ago

They're over 20 years old. Replace them. How many thousands of times has that start button been pushed...

#4 1 year ago

So far, after re-seating the switch connectors, the start-button problem has not gone, but the crate and bony beast ramp have not been acting up again. I am going with replacing the start button switch, and call it a fix .

#5 1 year ago

Just as a note, the crate registers not from physical contact, but by the ball passing above the eddy sensor, just in front of the crate. If it is not registering consistently, you can lift the playfield and turn the small adjustment post on the board a bit.

#6 1 year ago

I've heard that WPC95 games of this era had flaky switches. If they give you problems then replacing them wouldn't be a bad idea.

#7 1 year ago

So I replaced the start button, and this has solved one problem. The problem with the crate still appeared every now and them

Quoted from Rody:

Just as a note, the crate registers not from physical contact, but by the ball passing above the eddy sensor, just in front of the crate. If it is not registering consistently, you can lift the playfield and turn the small adjustment post on the board a bit.

Yeah, I found that out too. As a matter of fact, this did the trick. It would be fine at first, but after a few hours of operation (idle), it would show up in the matrix as "CLOSED". So at that point in time, I lifted the playfield and adjusted the post so that it shows as "OPEN". Checked with a ball if it still registers, and it did. I was afraid it would now not register when the machine is still cold (rendering it a problem in the eddy controller board), but it still works!

So, two different and unrelated problems, with an easy fix!

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