I did a bit more on Defender today. When I left it yesterday, it was working but the ship wouldn’t move up, and that just sucks.

The switch was making contact. I ended up tracing the wire all the way back to pin 1 on the top connector (3J2) of the interface board.

The wires were fine. I began tracing the circuit from that pin, and it went to resistor R12 in that top row of resistors. I pulled one end of the resistor out, and it tested OK. That connected to a small capacitor right below it (C13). I did the same with that and tested it with my capacitor meter. It was fine. Now, because I am clueless, I didn’t have much else that I really knew how to test without doing some research. So, I looked over the board to make sure everything was fine. One solder joint on a pin on the other connector looked a little crappy, so I fixed it. It had continuity before so I don’t think that really did anything.

The  last thing I did was take that capacitor in the lower right corner out and test it with my meter. It was a 100uf cap, but was testing kinda high…around 135uf if I remember right. For the hell of it, I replaced it.

When I hooked it all back up, the up switch was working fine. So, if I had to guess, I think changing that cap fixed it but I don’t really know for sure.

The joystick handles slow and sloppy (like your mother?), so I’ll need to work on that next.

Here is another pic of it next to its brother Moon Patrol.

Can’t wait to get these 2 in the game room…it’s going to be awhile though because I have to do a major rearranging. Anyways…it’s Friday. Have a good weekend…L8R.