I just picked up a DH. during inspection I noticed that the knocker was unplugged in the upper left of head. Since I bought it from a location, I figured the bar didn't like the noise. On start up the coil fires exactly 10 times every time I turn on the machine. I turned it off and came back the next day and made some standard adjustments and now the gun coil fires 10 times and not the knocker. I clear all adjustments to stock and still coil fires 10 times apron start up. In the manual it doesn't say anything about that as I was figuring that 10 fires would point me in a direction of something wrong. The game plays great other than that. Any help on this would be great.