Thanks, i have the same mindset you do...i'm not giving up, although i might be getting close......here's what happened last night. I figured out I believe I have a Roadblasters 4 cartridge.
#1, i upped the voltage to +5.5...no change, so i lowered it back down to 5.2
#2, i unplugged the board and turned it on it says "no cartridge" in blue, but is flashing and is continuously trying to restart. Is this normal or should i be getting a solid screen that says "no cartridge" and should not be flashing?? Well, i think i ruled out the system 1 board now.
#3 - I reseated all of the chips on the Roadblasters board. It was pretty easy to do, i have confidence in this now! The only problem is that now when i go to the playfield test, there are lines in it (see pic)...i don't know what happened. I pulled them all and lightly filed them and put them back exactly the right way.
Also, i got desperate, so i did pull a chip or two and ran the board to see what would happen, and i do get different "U" errors, so i can narrow the problem down to that upper row on ROMs on the board (see pics) I also messed with the jumpers some, but they just made more errors and created "L" errors, so i left them alone. I wonder if I am missing a set of chips in the cirlced area on the pic...can anyone confirm this?
I think i narrowed it down to a faulty Roadblasters board and a faulty PSU. I do have another power supply i pulled from my cab. that i MAMED, but i have no idea if it works or not..there's a pic of it below.
A) Will this work for Roadblasters?
B) How can i test the PSU to see if it works? How do i hook it up just to test it before i hook it to the Roadblasters board?
C) How do i hook it to the roadblasters game? Pics would be greatly helpful.
I'm starting to think the best thing might be to find/buy a known working Roadblasters cartridge so i can narrow things down even more. Does anyone have one they could sell me or trade for a potentially nonworking RB cart +cash??
Well thanks for everything, i feel like i might have taken a step backwards last night because now i have lines in the screen...but i think i did narrow down the problem some last night, and reseated chips for the first time! Well, please help me with these issues, here are the pics.