Lisa 2 Video Problem

From: James Rice <jrice_at_texoma.net>
Date: Sun Apr 7 16:10:54 2002

I downloaded and printed the Sun Remarketing Repair manual for the Lisa
as well as a parts manual with exploded views. Actually, I did this
three years ago when a friend was going to give me a non-functioning
Lisa, but he changed his mind.

If I get it, I'll check it out and probably will need to bug you about
it a little.

Thanks,

James

Jeff Hellige wrote:

>> > The first thing to do would be to pop the top off of the Lisa
>>
>>> and check the 4-5 video adjustment dials along the top of the video
>>> board, as well as the adjustment pot on the PSU. To me it definately
>>
>>
>> Please don't!. If you have a real fault (and this sounds like one), it
>> will not be cured by making adjustments. Once you've twiddled everything
>> you will still have to cure the real fault and then re-align everything.
>> The only times you should adjust presets are (a) after some other person
>> has been fiddling about and (b) after replacing components in the
>> relevant part of the circuit. And to twiddle PSU presets without knowing
>> just what you are doing is a good way to wipe out the entire set of
>> chips
>> in the machine.
>
>
> The adjustment pot on the PSU I was referring to is part of the
> video adjustment. It's reached from the rear of the machine through a
> small hole in the back panel. Changing it's value is actually part of
> the video alignment procedure after replacing the video board or
> adding the XL screenkit modification. The pots on the video board
> itself may also drift and need to be readjusted. This is easily done
> by 'eyeballing' the video output as you would with the vertical and
> horizontal sync adjustments on another monitor or TV. I once had to
> open up a early Panasonic multisync monitor and do this. Everyone else
> thought the monitor was bad due to it being totally out of sync.
>
> Jeff
Received on Sun Apr 07 2002 - 16:10:54 BST

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