7 Apr
2002
7 Apr
'02
4:10 p.m.
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 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
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.