Well upon visual inspection everything looks ok with the exception of Q5 I do not know if its ment to look like that around the top (some corroded looking stuff) Picture http://farm4.static.flickr.com/3286/2471266312_3a16f32b4f_b.jpg I tested L3 and R1 they both seem to be ok. What is the easiest way to test Q5 and U1, and I do not have a whole lot of equipment just a multimeter.
Patrick
On May 6, 2008, at 6:14 AM, James MacPhail wrote:
>
>
>> I have a schematic for a lisa video board is there only the one
>> version
>
> Yes, there is only one version (that we know of). The board in front
> of me
> says 620-0121-H on the silkscreen.
>
> As well as U1 7824, R1 120 @ 0.5W, also check Q5 BU406 and C12
> 2200u_at_25V.
>
> I have also heard of L3 going open, though that may be due to
> physical damage.
>
> HTH,
>
> James
>
>
>
> >
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