Midway Gunfight Gun Position

copious

Well-known member
Joined
Oct 16, 2006
Messages
2,224
Reaction score
94
Location
Sparta, New Jersey
One Midway Gunfight working except the left player gun only goes up? when you point down it goes up a little?
 
I have a similar issue, mine goes every direction but down. I assumed it was because of a cold solder joint. So you said it was a power supply issue. So did you cap the power supply then?
 
It's been my experience that issues with gun positioning usually turn out to be a bad Optocoupler, the small 8 pin chip by the connector, or the 7414 right behind them. The Optocoupler can either be bad or is not uncommon for the traces around the resistor array that powers them to have issues.
 
Last edited:
Update on this. I socketed and replaced H2, the ILD-74 opto-coupler and the gunfight position issue has been fixed. Thanks blinddog!
 
Back
Top Bottom