Whitechapel MG-1 workstation questions

On Sat, 2004-04-24 at 21:20, Bernd Kopriva wrote: [snip] thanks for that. The machine I've looked at so far has a good PSU, but the track on the power distribution board that feeds +12V to the system board is totally burned away, and someone had bypassed it with a piece of wire. Obviously the system board has suffered some major short at some point - I'm yet to find out if the bypass wire was added after they fixed the fault or not! In other words, it's possible one system board is completely dead, in which case yes there could well be a spare PSU. Depends on what state the system board is in this machine, and whether the PSU in the other one works or not; idealy getting two machines working would be nice! You could always use a standard PC PSU I expect. There's six different lines running to the PSU in these Whitechapels; GND, +5V, +12V, power fail are four of them. The purple wire I expect is -12V. That leaves a red wire, which would seem a strange colour to choose for a negative voltage. Maybe it's +15V or something odd, perhaps for driving the display. I'll let you know when I work it out :-) cheers Jules