Whitechapel MG-1 : dead power supply ?

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Wed Jan 14 19:03:49 2004

>
> On Wed, 2004-01-14 at 22:30, Tony Duell wrote:
> > A kludge, sure, but it's better than the Torch XXX where the official
> > procedure is to replace the PSU assembly if the battery goes flat (!).
>
> Indeed. I happen to have the XXX service manual on the desk at the
> moment (for once something is to hand and not buried!)
>
> The offical procedure was to check the battery voltage and if under,
> bypass the PSU to charge the battery. *Then* if it was still dead, swap
> out the PSU.

Not according to the totally lusing service manual that came with my XXX
(it has a glossary which includes :

IC : Integrated Circuit. One of those black things on legs on a circuit
board [1]

ICs : More than 1 IC

[1] The fact that the XXX contains ceramic-packaged ICs (not black) and
PLCC packages (not on legs) has escaped the notice of this idiot...
(footnote by ARD, not in the manual).)

How are you supposed to 'bypass the PSU'? The normal trick of swapping
over the mains in and out connectors on the PSU board is lethal, since it
means the input to the SMPSU is no longer fused! If the chopper decides
to fail at that point...

-tony
Received on Wed Jan 14 2004 - 19:03:49 GMT