Whitechapel MG-1 workstation questions

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Sat Apr 24 20:50:18 2004

> 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

Maybe -5V, I would check...

> 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 :-)

There's a +24V line for the monitor. It's routed over the power
distribution PCB and mainboard to the monitor connector. Inside the
monitor it's stepped up to +48V (there's a little swtiching converter PCB
in there) and then feeds a 'standard' KME monitor chassis (very similar
to the PERQ 2T1 monitor).

-tony
Received on Sat Apr 24 2004 - 20:50:18 BST