Author Topic: Johnny Mnemonic flipper issue  (Read 162 times)

Offline NorthPortFL-Pinball

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Johnny Mnemonic flipper issue
« on: July 07, 2024, 06:12:32 PM »
I installed new clear flipper buttons (to replace the red and blue flipper buttons) and the associated light sockets this morning on my JM. After installing them, whenever I shut the coin door, the left flipper goes up into the top position as though someone were pressing the left flipper button. The right flipper is fine. I checked everything thinking something was hitting the flipper mechanism causing a short or something. After several attempts to correct, I said "ok what changed?" as this was not a problem prior to installing the LED buttons and light sockets. The light sockets were a very close fit when the playfield went down (I had to move them a couple of times to make them fit). So, I completely removed the led light sockets for the red and blue flipper buttons.  I left the new flipper buttons installed though.

Any ideas what could be causing the left flipper to engage? Could it be the new flipper button?

Thanks again for your help.

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Update on this...I went back and removed the new clear flipper button and retested...the left flipper did not engage with flipper button removed. Looking at the new flipper button, it might be about 1/16" or 1/32" longer than the original red flipper button.  So, it was acting as though someone was pressing the flipper button. I reseated the new flipper button and it stablized, but I would not be surprised if I have to sand down the end of that flipper button at some point. 
« Last Edit: July 07, 2024, 07:35:08 PM by NorthPortFL-Pinball »
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Offline k7

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Re: Johnny Mnemonic flipper issue
« Reply #1 on: July 07, 2024, 09:34:06 PM »
flipper switches are normal leaf switch style? just regap them with the new buttons. it happens.
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Offline NorthPortFL-Pinball

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Re: Johnny Mnemonic flipper issue
« Reply #2 on: July 09, 2024, 07:59:22 PM »
No, JM has the optical board style switches for the flippers.
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Offline RAW POWER

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Re: Johnny Mnemonic flipper issue
« Reply #3 on: July 09, 2024, 08:13:32 PM »
The opto interruptor was pushed out by the new button. You are right, you could sand it down. Another option would possibly be to add washers under the opto board to change the spacing making it not push the interruptor.

Offline NorthPortFL-Pinball

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Re: Johnny Mnemonic flipper issue
« Reply #4 on: July 09, 2024, 08:51:25 PM »
Yes, I was thinking of moving the opto out, but I think I will opt to sand it down if the problem comes back.

One more thing, I got these flipper buttons from Comet Pinball. There is an "E"clip near the end of the button shaft. I am thinking this might be preventing the flipper button from seating completely back, in the open position.  A 1/32" inch difference might have caused the problem. I don't see why it is needed because old button did not have an "E" clip.
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Offline FUNWIZ

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Re: Johnny Mnemonic flipper issue
« Reply #5 on: July 09, 2024, 09:19:45 PM »
If the inner core is expanded on the end it doesn’t need an E washer but if it has an E washer it probably needs one to keep it from falling out on the floor.
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Offline NorthPortFL-Pinball

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Re: Johnny Mnemonic flipper issue
« Reply #6 on: July 10, 2024, 06:12:35 PM »
Ya, the inner core is expanded on the end. Here's a picture showing the E clip right behind the expanded core.
Current Pins: Cyclone, Hurricane, Firepower (our first pinball - We love this pin and want to totally restore it)

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