Date   : Sun, 21 Sep 2003 22:16:26 +0100
From   : "Austin Pass" <dawnandoz@...>
Subject: Re: Two BBC Micros need some help!

+SNIP

> Ah, -5v supply is very low, it's about -1.5v.
>
> Maybe this is the reason for non-starting Beeb and psu.
>
> Any ideas, as the BBC Service Manual states
>
> "However it is not recommended that attempts should be made to repair this
> power supply, instead it should be treated as a module to be exchanged."
>
> It does supply a circuit diagram, no where do I start for missing -5
volts?
>

+SNIP

I think that the -5V supply is only necessary for the RS232 (Serial) and
casette interfaces (i.e. missing the -5V wouldn't prevent startup) but I
might be wrong.

Austin.