GORF joystick issues

Chainz

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I picked up a gorf arcade a week ago, i'm restoring it back to the original but i'm having an issue with the joystick. The ship pulls all the way to the left when not touching the joystick.
I was wondering if it might be the left/right sensor on the pcb board connected to the bottom of the joystick.
Any help is very much appreciated.
 
Look for a change in voltage on the receiver side of the slot opto when it is blocked compared to open. Compare that to one of the good directions....that should tell you what is going on there. Its also possible if that all checks out ok there is a shorted debouncing cap on the i/o board or possibly a bad IC reading the optos.
 
Thank you for the advise, i will check out out the quad comparator chip marked in the manual. Thank you very much
 
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