Playchoice single monitor player 2 goes left by itself

john2654

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Playchoice single monitor player 2 goes left by itself

Was trying a 2 player game today.
The player two seems to do a slow left all by itself.
If I press left it goes full left. If I press right, it goes slow right.

I have disconnected the left switch and it remains doing the auto slow left.
I tried disconnection the player 2 wiring harness and it still does it.

What up with this? Bad motherboard?
I tested the same thing happening on Double Dragon and Contra.

 
Last edited:
Sounds like the left control input may be shorted to ground on the PCB due to a shorted decoupling cap or something .
 
Found some extra solder on the filter board. Will clean it up and see how it works.
EDIT: Cleaned it up, yep that fixed it. Thanks Tighe!

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