(Topic ID: 267764)

Trashed target alpha playfield -complete repaint

By Boslaw

4 years ago


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Topic Stats

  • 58 posts
  • 14 Pinsiders participating
  • Latest reply 3 years ago by srcdube
  • Topic is favorited by 12 Pinsiders

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There are 58 posts in this topic. You are on page 2 of 2.
#51 3 years ago
Quoted from Boslaw:

That said, I'm happy with my first repaint & clear coat.

You should be - good job!

#52 3 years ago

I used 2.5 cans of spraymax but I could have finished with 2. I tried sanding the 2nd coat too soon and smudged it. If I had waited to sand, that 2nd coat would have been perfect.

The last 1/2 can left little air bubbles in the surface of the clear. I was worried but those sanded out easily with 800 grit.

I bought an air sander to wet sand the final coat - I think this is essential. Hand sanding, even with a sanding block, is too slow and too uneven.

I've got way too much $ into this machine if you factor in all of the equipment I've had to purchase, but I enjoy working on pins as much as playing them so I'm looking forward to more projects once I finish putting target alpha back together and getting it playable.

#53 3 years ago

following

1 month later
#54 3 years ago

This machine is finally "done." I still have a weird issue where my pop bumpers stick down whenever they're hit, but the game works well in all other respects. I have to try taking the bumpers apart again to see if the coil stops are magentized. That's the only thing I haven't checked yet.

@scrdube - thanks very much for the schematic and switch excel. I bought the full schematic from PBR, but having it cleaned up and digital (and also having specific switches labeled on the schematic so you don't have to rely on wire color) was a HUGE help, not to mention HowardR spending hours with me on the phone talking me through all of the various issues with this machine.

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#55 3 years ago

Just seeing this now ... still working on the spreadsheet of relays. Learning a lot just thinking through the logic of why switches are where they are and what they are doing. Hoping to finish it up and make it available to TA owners.

Re the bumpers being held down ... trusting that you are immediately powering off when it happens so you don’t burn out the coils. I ran into that when I was trying to get a bit more kick out of them and adjusting the end of strike switches open up as late as possible. Turns out the EOS switches are in parallel which results in both bumpers held down if EITHER of them don’t release the eos switch.

If you manually pull down the poppers (Power off) you will find those switches actuated as the popper gets to the end of its stroke. One of them must not be opening up enough.

#56 3 years ago

Looks Great Man! Good things come to those who wait, and are persistent.

#57 3 years ago

The reason I think the coil stops may be magnetized is that the coils don't seem to be energized when the poppers get stuck down. They don't buzz or anything. Also, when they get stuck down, a press of the flipper button releases them (don't really understand why that happens).

phil-lee - Thanks! Was a great covid project

#58 3 years ago
Quoted from Boslaw:

The reason I think the coil stops may be magnetized is that the coils don't seem to be energized when the poppers get stuck down. They don't buzz or anything. Also, when they get stuck down, a press of the flipper button releases them (don't really understand why that happens).
Phil-lee - Thanks! Was a great covid project

Interesting. Not sure if there are sleeves in popper coils, will check mine. If so possibly damaged or dirty. Flippers may be providing just enough vibration to let them go. Are both stuck down or only one? If both I’d still say it’s electrical.

Could maybe be the relay switch that holds on coils (P I think?) aren’t totally disengaging and your getting a small bit of current going to the coils ? If they stick down with the playfield up, turn off the room lights and see if there’s any electrical arcing in a relay somewhere. I’m not in front of my schematics but there is a relay that is turned in to power them (bumpers don’t have that). Thinking P but could be wrong.

Hitting the flipper may be drawing enough current to break the circuit in an slight arcing situation.

If you have a meter you could also measure to see if you’re getting a little trickle voltage on the coils when they are stuck on.

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