This backtrack is the final part of my pinball machine refurb escapades so congratulations to those of you who have stuck with it, it can’t have been easy. To those of you who haven’t stuck with it, well, you won’t be reading this I guess, but go screw yourself anyway.
By the time that Williams had evolved their pinball architecture to System 7 they no longer used transistor pairs to fire sounds in the same way and instead used a dedicated PIA on the CPU board to trigger sounds and
Welcome to part five in the thrilling serialisation of my electronic blunderings through the world of pinball repair. I do this so you don't have to.
My boards arrived, or should I say, a CPU board and a driver board arrived, not the same ones that left, but a CPU board and a driver board nonetheless, and I was eager to get them straight in my machine and fire it up, but there was a little work to do first. Scott had replaced my System3 CPU board with a System 6 CPU board, easily
OK, OK so I missed the usual Bi-Weekly entry a fortnight ago but, like Microsoft and their Cloud Services, I blame it on the leap year so expect the same thing to happen again in four years time. Now that normal service is resumed I need to segway from the Leap Year to Pinball.
Speaking of Pinball, I was feeling like I was getting nowhere with this thing, and I was clear that the most important and the most difficult things to fix are the CPU board and driver board, and the ones in
Part 3 of the restoration process gets into the blood and guts of the problem, and although an initial view of the workings of a pinball machine are certainly daunting, they can be broken down into four main sub systems:
General Illumination (G.I.)
That doesn't make it any easier to fix it though, it just makes it easier to organise somebody else to fix it.
The solenoids are effectively coils that
Welcome back, I didn't expect you so soon. are you sitting comfortably? Well I'll begin.
Eager to get this thing working I started off by assembling the table, first by bolting the back box onto the cabinet, and once it’s physically attached with the bolts there are all of the connectors that link the playfield to the circuits in the back box and also a grounding strip.
Better not to get them mixed up.
Williams connectors are coloured and shaped so that