esqueleto
Well-known member
Ok, so this is a game that I see fairly often and rarely working. Most of the time it can ben had for $100 or less! I'd like to fix it as it's actually a really satisfying game! Lets start by explaining the monitor works great, nice sharp picture. Freshly capped K7000. I've replaced the Optical sensor pcb in the gun with a repro unit from Twistywrist (Riptor rocks BTW!). I've reflowed the header pins on both the distribution PCB and the Aux power pcb. Checked voltage the the Eproms on the Video pcb (set to 5.03vdc). Washed the mirror and the CRT screen. Cleaned the glass lens in the gun barrel (I did have some hesitation as to the direction of the lens, I placed the convex side facing the mirror). Finally i just removed the bezel to eliminate that variable. Here's where I get to the issue. The gun will not register shots accurately. If i aim slightly up and hold the position the bullets will fire a straight line across the top of the screen. If I fire a grenade it will explode top right. If I let the gun fall back to it's natural resting position shot will not register on screen at all and grenades will burst to the bottom right. Testing voltage at the optical PCB reveals I'm getting 12vdc.
I've traced the lines back from the edge connector through the Sound PCB (top board) into the bottom pcb and the first chip the signal enters is a MC74F74N. Does anyone have any info on what pins on this chip should be active during game play or am I barking up the wrong tree. Thanks for any help and maybe if we solve this it will help bring some other wolfs back from the dead.
I've traced the lines back from the edge connector through the Sound PCB (top board) into the bottom pcb and the first chip the signal enters is a MC74F74N. Does anyone have any info on what pins on this chip should be active during game play or am I barking up the wrong tree. Thanks for any help and maybe if we solve this it will help bring some other wolfs back from the dead.