Terminator 2 Controls Issues

I wanted to bump this old thread.

I'm having very similar issues and replaced U2 with no luck and now a stuck player 2 gun coil.

Did this fix your guns? U1 and U2? Is it reading in single digits in the test for all 4 directions?
Hey guys my guns do the sand thing, bounce around erratically for both players and player 2 moves both players 1 and 2 ..... any luck fixing your issue?
 
Hey folks thought I'd post an update for future failures in case anybody else needs to troubleshoot. My guns were bouncing all over the place x and y would both bounce from 146 down to 138 or so then repeat back at 146 going left and right ... same occurred with up and down, completely random numbers. In game it looked like my guns were just shooting up into the corner of the screen, wouldn't hit anything. After swapping every chip on the Coil/Lamp board, changing out all 4 pots in both guns (expensive) and tracing back all wiring it looked like my issue wasn't coming from the guns OR from the board. Tracing back further I was able to find my fault on the main PCB. Chip U103, SN74HC541N - a 3-State Octal Buffer. If anybody else has an issue like this and they can't find the fault on the Coil/Lamp Driver board try to start probing in the U105/U103 region on the main PCB (area near the 2032 battery). Hope this helps anybody who might be stumped with a similar issue. Circled the bad chip and supplied a pic of the chip needed to get the guns up and running again.
 

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Hey folks thought I'd post an update for future failures in case anybody else needs to troubleshoot. My guns were bouncing all over the place x and y would both bounce from 146 down to 138 or so then repeat back at 146 going left and right ... same occurred with up and down, completely random numbers. In game it looked like my guns were just shooting up into the corner of the screen, wouldn't hit anything. After swapping every chip on the Coil/Lamp board, changing out all 4 pots in both guns (expensive) and tracing back all wiring it looked like my issue wasn't coming from the guns OR from the board. Tracing back further I was able to find my fault on the main PCB. Chip U103, SN74HC541N - a 3-State Octal Buffer. If anybody else has an issue like this and they can't find the fault on the Coil/Lamp Driver board try to start probing in the U105/U103 region on the main PCB (area near the 2032 battery). Hope this helps anybody who might be stumped with a similar issue. Circled the bad chip and supplied a pic of the chip needed to get the guns up and running again.
if that's your board in the picture, I encourage you cover your rom windows with labels immediately.
 
if that's your board in the picture, I encourage you cover your rom windows with labels immediately.
I scooped this arcade up a couple months ago broken on Craigslist and as I was working on it I did notice the EPROM's. That was my board 2 nights ago. While I was repairing the board that is exactly what I did. Good note though, yes all EPROM windows should always be covered, thank you for the advice mecha 👍🏼
 

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yeah, it's fun when you get one of those boards and have rom errors and see the labels had fallen off those exact roms. good times.
 
Hey folks thought I'd post an update for future failures in case anybody else needs to troubleshoot. My guns were bouncing all over the place x and y would both bounce from 146 down to 138 or so then repeat back at 146 going left and right ... same occurred with up and down, completely random numbers. In game it looked like my guns were just shooting up into the corner of the screen, wouldn't hit anything. After swapping every chip on the Coil/Lamp board, changing out all 4 pots in both guns (expensive) and tracing back all wiring it looked like my issue wasn't coming from the guns OR from the board. Tracing back further I was able to find my fault on the main PCB. Chip U103, SN74HC541N - a 3-State Octal Buffer. If anybody else has an issue like this and they can't find the fault on the Coil/Lamp Driver board try to start probing in the U105/U103 region on the main PCB (area near the 2032 battery). Hope this helps anybody who might be stumped with a similar issue. Circled the bad chip and supplied a pic of the chip needed to get the guns up and running again.
Had the same problem with the guns. Replacing the same ship as you did fixed the problem. The game is now playable. Thanks for posting this!
 
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