Nintendo VS Multikit Zapper Help

ThunderBunny

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Been messing with this for quite a while now. I've got a Nintendo Vs cab with the MultiVS kit installed. I've been trying to get a NES Zapper to work with it to no avail. I can get the trigger to flash the screen but that's about it. A little rundown to what I've done so far. I don't have the gun harness, so at the moment I have it rigged.
I've taken apart the Zapper and took out the transistor and bridged the B and C. I've cut the caps off the board that needed to be cut out per the manual.

Gun wiring:
Purple wire(trigger) to position 1(brown wire) on harness
Blue(hit) to position to position 2(red)
Brown(ground) to ground
White(+5v) to +5v

And alarm is disabled.

I've read they're very sensitive to monitor adjustment and I've changed it every which way, never a hit on screen. Am I completely off here? I want to play some Duck Hunt and Hogans Alley!
 
When I did this on the bench, I had to run trigger and hit through an inverter, then it worked with no modification to the zapper at all. I ran each signal through a 74LS04.
 
I have had this issue with every NES gun have tried. Solution is, make sure the wires from the gun are as close to the VS board as possible. I soldered the first two I had directly to the VS board at the corresponding pins. I soldered on an NES plug to my last VS board so that I could remove the connection from the PCB easier. I haven't tested it yet to see if it works.
 
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This might sound dumb, but do you have any overhead lights, windows or lamps shining onto the monitor? Try it in a completely dark room.
 
Also dont look at wire color. Look at actual pin location number. When I first did one many years ago I looked at the gun harness pdf and just looked for those colors on my molex connector. The wires are a different color on the cab side of the harness. The gun harness itself has its own colors. Also where are you sourcing 5v and ground from? Ground should come from the same molex all of your wires are coming from and 5v from the coin mech wires is the easiest place to get 5v from.
Just curious too, did you test the zapper on a nes before you did the mod? Maybe it's bad?

 
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I posted this exact problem about a year ago.

https://forums.arcade-museum.com/showthread.php?t=379448

The solution that works is what Yotsuya posted on reply #10. I never had any more problems from the gun and I could adjust the brightness and colors to what I wanted. I have since sold that game, but I'm now in the process of converting a 60 in 1 to a VS unisystem so I can get back to shooting ducks again.
 
I posted this exact problem about a year ago.

https://forums.arcade-museum.com/showthread.php?t=379448

The solution that works is what Yotsuya posted on reply #10. I never had any more problems from the gun and I could adjust the brightness and colors to what I wanted. I have since sold that game, but I'm now in the process of converting a 60 in 1 to a VS unisystem so I can get back to shooting ducks again.
Yeah, I don't know why it only worked that way.
 
I posted this exact problem about a year ago.

https://forums.arcade-museum.com/showthread.php?t=379448

The solution that works is what Yotsuya posted on reply #10. I never had any more problems from the gun and I could adjust the brightness and colors to what I wanted. I have since sold that game, but I'm now in the process of converting a 60 in 1 to a VS unisystem so I can get back to shooting ducks again.
My search-fu must have been broken when I searched. Thanks.
 
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