[Elecraft] K2: KPA100 Removal

[Jon Perelstein]

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 <w3fpr at embarqmail.com> wrote:

>  John,
>
> I believe after you replace diodes D16 and D17 in the KPA100 (both are
> 1N5711), you will find the problems go away.