I'm mainly an arcade guy...I have and have had a few pins over the past couple of years, but other than rebuilding power supplies I haven't had to do anything to them. I picked up a project High Speed recently, and cosmetically it's in great shape, but other than a few lamps lighting, it does nothing when turned on. The power supply definitely needs to be rebuilt as it only outputs 4.7v which drops to 3.5 under load. The cpu has no acid damage or other visible damage, but I will reflow the headers and check more closely soon. Also, the 2.5 amp fuse from pin 5 of the flipper power supply blows immediately! Would this indicate an issue with one of the br's, relays, or solenoids downstream, or with the board itself...or could it be either or both? It also looks like there were some mods done to the transformer wiring, like the 6.3v lines were replaced, but as far as i can tell that looks like it was done properly, although i don't know why? I was told it had "a couple of bad solenoids," and there are like a half dozen old ones lying on the bottom of the cab, so many have been replaced...can these be tested in circuit without powering the game up?
My main question is, is there a "flow chart" for working on pins? With arcades, it's fairly simple...power supply, connections, board/monitor issues and that's pretty much it. My plan is to address the power first, but are there things I need to check before powering the game up?
Any help or advice would be greatly appreciated