On Nov 25, 1:28, Tony Duell wrote:
> > What's J5 (3-pin Mate-N-Lok) on the PSU for?
>
> AC output (centre-tapped) to the line time clock board or power-fail
> interrupt board. Watch out, it comes straight from a secondary on the
> mains transformer. There is a fuse, but it's in series with the centre
> tap only. Which means that shorting the outside 2 pins together can burn
> out the transformer.
Ah. That would probably explain why I have a cable with two white wires on
pins 1 and 3, and a red wire on pin 2, connected to a 6-pin single-row
Mate-N-Lok (like the ones used on power regulators).
> > And lastly (for now :-)), which direction should the fans blow?
>
> I am not sure what the offical way is, but if you reverse the fanse
> aren't you going to be blowing hot air (heated by the PSU) over the logic
> cards? Most machines I've got where the fans are between the logic and
> the PSU draw air in over the logic and blow it out over the PSU
heatsinks.
It doesn't get very warm, but then there's not much in the machine at the
moment.
--
Pete Peter Turnbull
Network Manager
University of York
Received on Sun Nov 25 2001 - 04:47:07 GMT