Whitechapel MG-1 workstation questions

From: Jules Richardson <julesrichardsonuk_at_yahoo.co.uk>
Date: Sat Apr 24 17:09:49 2004

On Sat, 2004-04-24 at 21:20, Bernd Kopriva wrote:
> Hi Jules,
> i got that one formTony Duell some times ago :

[snip]

thanks for that.

> Btw: do you have a spare power supply (or maybe some schematics) ? Mine
> is dead, so i never got my machine up and running :-(

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
Received on Sat Apr 24 2004 - 17:09:49 BST