Mac Restore CDs/Manuals

From: Tothwolf <tothwolf_at_concentric.net>
Date: Thu Nov 22 05:30:16 2001

On Thu, 22 Nov 2001, Tony Duell wrote:
>
> > I have a non working 128k unit I'd sure like to get around to fixing...It
> > actually worked before I located a keyboard and mouse for it, I think I
> > used the wrong type of keyboard cable. When I powered it up with the
> > keyboard, heard a snap, and it didn't work anymore :/
>
> The keybaord port carries +5V, data (TTL level), clock (TTL level),
> ground, in that order.
>
> If the keyboard cable was made to swap the pins end-for-end (which some
> cables do), it would swap over +5V and ground at the keyboard. The
> keyboard won't like this!, and it may also have damaged the PSU inside
> the Mac. My guess is that the logic board in the machine is still OK.
>
> I would check the PSU outputs inside the Mac. And investigate the PSU. Is
> the fuse still good? What about the chopper transistor. And so on.

I think the fuse was ok. I think I can get to this machine, and may pull
it out tonight. I'll check the chopper and related components.

-Toth
Received on Thu Nov 22 2001 - 05:30:16 GMT

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:34:12 BST