OK. Pin 16 on CN10 is ground but just about anywhere earthy will do. What
you are looking for a nice set of rectangular pulses on pins 1-14. If you
see nothing measure the voltages on these pins. If they are all lower then
2v then I think we can assume the CPU has stalled or something just as
tragic! If you reused the black ceramic resonator from the old board make
sure the legs haven¹t dropped off. They do come adrift at will. Come to
think of it also see if there is a pulse at pin 1 of the CPU, that should
tell us a lot.
Cheers,
Andy
On 13/01/2011 19:54, "ML" <f115@rocketmail.com> wrote:
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> Will do. Incidentally mine is now upright. I had to replace those smaller
> headers I had put in with molexes. I know I had continuity between the 367 and
> the top panel at hte other end but I'll confirm the voltages and see if I can
> figure out what I'm looking at on the scope :) Does the the location of ground
> matter in this case?
>
> --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> , Andrew
> Jury <andy@...> wrote:
>> >
>> > Right, check the voltages at CN10! If you have a logic problem or scope you
>> > will need to see if you have pulse trains on pins 1 to 14. A very common
>> > problem is that you really do need to solder the connections on the top of
>> > this socket as it is a right angled one and needs to be as strong as
>> > possible. If you are getting logic levels at CN10 but nothing at the other
>> > end on the right-hand top panel board, check where the coloured wires
>> > terminate. They have a habit of snapping off whilst the lid is opened!
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