Posted by
Jon Perelstein on
Apr 10, 2011; 6:51pm
URL: http://elecraft.85.s1.nabble.com/K2-KPA100-Removal-tp6212794p6259337.html
Don,
I'm trying to replace D16 and D17 in the KPA100 but I'm having trouble
removing the heat sink so that I can get at them (it looks to me as if I
have to remove the heat sink to get at the bottom of the PC board to
unsolder them).
I have removed the three black pan head screws that attach the rear panel to
the heat sink.
I have removed the seven standoffs that screw onto the set screws that come
out of the heat sink and hold it to the PC board.
I have removed the four (2 each) 4-40 x 1/4" screws at Q1 and Q2 (2 each)
that hold Q1 and Q2 to the heat sink.
I have removed the two 4-40 x 1/4" screws that hold Q3 and Q4 to the heat
sink.
When I try to remove the heat sink from the board, I'm getting resistance
from the center of the board, near Q1 and Q2. I don't want to just pull in
case there's something that I've missed removing. Did I miss something, or
is this one of those cases where a sledgehammer is appropriate?
Well, okay, maybe not a sledgehammer...
Thanks.
Jon
WB2RYV (ex KB1QBZ)
On Sun, Mar 27, 2011 at 4:50 PM, Don Wilhelm <
[hidden email]> wrote:
> John,
>
> I believe after you replace diodes D16 and D17 in the KPA100 (both are
> 1N5711), you will find the problems go away.
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