tracing out schematics

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Sat Nov 20 19:36:33 2004

>
> If it's a simple board with just a top and bottom layer, then I normally
> photocopy it and use that in conjunction with the real pcb to make a copy
> of the traces.

I find it _much_ easier to trace connections with an ohmmeter than
visually. It's very easy for your eye to 'jump' to a neighbouring trace.
Of course you do try to follow the traces so you have some idea where to
check with the ohmmeter.

> That said, if you have connectino diagrams, have you thought about using
> an ATX psu? it's ok for switch on/off just short pin 14 on the atx
> connector (green wire iirc) to ground and that will turn on the psu.

IMHO the PSU is part of the machine and should not be replaced by some
other random replacement!. An ATX PSU was certainly not original in this
machine, and the aim of a repair/restoration is to keep the machine as
original as possible by replacing as little as possible (e.g. replace a
transsitor, not a PSU!). The way that PSUs have changed over the years is
somewhat interesting, and part of the history of electronics if not
computing.

-tony
Received on Sat Nov 20 2004 - 19:36:33 GMT