Posted this over at the Black Hole and System 80 Clubs as well, going for full outreach to everyone.

Working out some bugs with my Black Hole pinball machine. Had just got done tracking down and repairing a dreaded GI short on the main play field, and decided to do some upgrades and bulletproofing while I had the play field removed. After my “ attempts” at bulletproofing and upgrades, I seem to have a couple of issues:

1. Right Side Flipper Issue: Currently the right side flippers are not operational when the flipper button is depressed. However is an significant arc / flash / spark that I can see (through ball guide crease) at the flipper switch — when pressed., and there is no flipper action. I found the one (1) solenoid had the coil diode backwards, but corrected it. Hopefully that did not cause board trouble. When the ball goes down to the lower playfield, the lower playfield right flipper is operational. It appears the U relay is okay (the contacts show normally closed as per the schematics ). Has anyone ever had this sparking issue at the flipper switch? Any suggestions?

2.) Up Kicker Not Strong Enough: The infamous up kicker strikes again. There was a A-1496 coil installed which was working great. Again I was going to upgrade and continue my bulletproofing (Bulletproofing = upgrading the power transistor and adding the pull up resistor, installed and wired a pop bumper driver board to prevent burn out/ meltdown / overheating, and upgraded the coil to the A-4893 coil). The pop bumper driver board was a suggestion found on Pin Lizards Black Hole / Haunted House Club manual. I am stumped why the up kicker lost the strength / power to shoot the ball up the ramp. Defective power transistor? Suggestions?

If anyone could assist or provide some guidance or insight it would be greatly appreciated. I am so close to getting this machine running so I can enjoy it. I have learned so much, but still have so much more to learn. Thanks in advance for any and all help.