I picked-up my first Midway Space Invaders upright and the board doesn't appear to be booting (video trase). The normal adjustments and testing show I have good +5 and +12 at the edge connector, but only -0.4 where -5v should be. First, will a lack of -5v prevent the boardset from booting (I don't know what it is used for on SI). Secondly, I saw Modessitt say, in 2007, that he installed a switcher for just the +5v (and gnd) line, so I saw that takes care of the Sense line issues. Therefore, the same should be possible for the -5v (and gnd) line?
I am not sure that is all that is wrong with the game, but it is a place to start. I will likely cap the entire power supply PCB, but don't know if that will fix it and would prefer to have the entire thing running on a switcher (yes, I know Alex sells the conversion wiring kits to use a switcher).
Scott C.
I am not sure that is all that is wrong with the game, but it is a place to start. I will likely cap the entire power supply PCB, but don't know if that will fix it and would prefer to have the entire thing running on a switcher (yes, I know Alex sells the conversion wiring kits to use a switcher).
Scott C.
