Allan,
Fine that you found it - somewhere along the line, the base K2 was
drawing excessive current and the trace acted like a fuse. I can't say
what the original problem was - maybe the power connector was plugged in
backwards, or something 'dumb' like that.
In any case, it is a simple matter to remove the delaminated PC board
trace and any charred material then repair it with wire. I would
recommend that you use #20 or larger wire for that replacement trace (or
use 2 pieces of #22 side by side). If you use bare wire, you can dress
it along the old path and encapsulate it in a small bit of epoxy which
will also glue the wire down to the board - it will be just as good as
new (you can even color it green with a permanent marker and few folks
will spot the repair).
73,
Don W3FPR
Allan Bacon wrote:
Don,
Thanks for your help. When I checked for continuity between the cathode of
D10 and the anode of D9 it came up negative - problem.
So I temporarily jumped the cathode of D10 and the anode of D9 and the rig
powered up correctly.
Then I took the heat sink off and I see trouble, not sure if these are the
right words, but it is what I see.
The board between D9 via R-14, R-13, FRC-11 almost to R7 is delaminated, no
green material, just copper and there is evidence of charring.
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