billyseven
Active member
I've been working on a Midway Gun Fight where one of the cowboy's guns couldn't be aimed downward and the other gun worked intermittently.
It turns out that the 18 pin Molex connector was to blame for the intermittent aiming and some other problems with movement too.
Regarding the second gun problem I had to replace the H2 optocoupler and now the game works correctly but this chip gets pretty warm and the resistor network GH12 used for the H2 chip gets hot enough to burn you.
Due to the design of the games controls these gun inputs are always grounded unless one of the guns is moved to a different position. My board and some others pictured on the internet seem to have a minor black discoloration above this chip suggesting they may all get hot. Also If I pull H2 out of the circuit or even just bend up pins 2 and 3 nothing will even get warm. I have checked all of the wiring on the control panel and harness, both visually and with a meter but I don't see any problems.
I'm wondering if anyone else has noticed if their game board gets overly hot at this location as well?
One thing to note is that someone had already made a custom discrete resistor network for GH12 but since they had used a different value for the resistors then what is shown in the schematic I chose to replace them with the correct SIP resistor.
Thanks in advance for any thoughts or input!
Dave
It turns out that the 18 pin Molex connector was to blame for the intermittent aiming and some other problems with movement too.
Regarding the second gun problem I had to replace the H2 optocoupler and now the game works correctly but this chip gets pretty warm and the resistor network GH12 used for the H2 chip gets hot enough to burn you.
Due to the design of the games controls these gun inputs are always grounded unless one of the guns is moved to a different position. My board and some others pictured on the internet seem to have a minor black discoloration above this chip suggesting they may all get hot. Also If I pull H2 out of the circuit or even just bend up pins 2 and 3 nothing will even get warm. I have checked all of the wiring on the control panel and harness, both visually and with a meter but I don't see any problems.
I'm wondering if anyone else has noticed if their game board gets overly hot at this location as well?
One thing to note is that someone had already made a custom discrete resistor network for GH12 but since they had used a different value for the resistors then what is shown in the schematic I chose to replace them with the correct SIP resistor.
Thanks in advance for any thoughts or input!
Dave
