24 Apr
2004
24 Apr
'04
1:50 p.m.
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