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Taito F3 multi won't boot anymore -- Taito F3 test button?

Tyrith

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I had a few games in storage and have been checking them over now that my games are back up & running. The Taito F3 Multi went a bit haywire on me -- specifically the test button stopped working. Any suggestions on what button I'd replace it with? Planning on ordering a couple of pots for various repairs and figured I'd try to chuck some of these on the list.
 
I received some new Sandisk SDcards today & reimaged them. I took a video of whats happening & compressed it but server won't take it at 10mb -- I can put it on youtube if that's any help.

- Have confirmed voltage at 5.08v
- New & reimaged sdcard
- Confirmed the Taito F3 works w/the old Puzzle Bobble 2 game

Given the multi used to work after a reset & the button doesn't appear to work anymore, any suggestions for getting this up and running again?
 

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This was ultimately resolved by methods I'm still not sure of.

I did some additional board swaps, and ultimately had 2-3 quarter mech wires get knocked loose. Given I was working on other games, I eventually plugged the Taito F3 back in w/the old Puzzle Bobble 2 and got a 'SERVICE SW ERROR' message. After re-wiring the switch correctly, it started booting correctly. The previously mentioned test button also appeared to start working.

The funny graphic w/lines still appears after loading a game, but only for 2 seconds prior to booting to the loading menu. Not entirely sure what fixed this.
 
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