Troubleshooting a 5V Apple III

[Mike Maginnis]

On 8/23/2010 1:47 PM, Tony Duell wrote:
>>
>> I suppose, as I'm the one asking for help here, that I'll take the
>> advice given and leave the rest without comment.
>
> My comments on board-swapping were _NOT_ directed at you. Old-timers here
> will know it's a perpetual rant of mine :-). Quite simply I can't see how
> making random changes to a device until it appers to work again is in any
> way actually putting it right.
>
> However, I have been caught so often by making assumptions when doing a
> repair that I have learnt (I hope) that it is best to assume nothing and
> check everything. Even if you know the PSU is good, it's best to check it
> when powering the computer. YOu may well think you know a switch is
> working perfectly, this did not stop be being led on a merry dance one
> afternoon when the paper-out microswtich in an HP printer clicked
> perfectly but was in fact stuck _closed_.
>
> Do you have a scheamtic of the machine? If so, is it on-line anywhere.
> I'll fidn a way to take a look at it and suggest more tests...
>
> -tony
>

Understood.  Thanks for the explanation.

I'll check the PSUs with the multimeter tonight.

There's a set of Apple III schematics here:

http://apple3.org/iiischematics.html

I appreciate your assistance.

- Mike