KPA100 - Fitting PC to Heat sink

[Nick G3RWF]

I am  trying to fit the PC to the heat sink but there is not a neat match of set screws to holes in the PC. No problems in screwing the set screws into the heat sinks (i.e. certainly not cross-threaded) but there is a tiny mismatch. I am very very reluctant to use any force (and I have to get it back off anyway).
Anyone else have this problem and any suggestions? Maybe a comment will make a change from K3 frenzy (and yes it does look great!)
73
Nick G3RWF
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[Don Wilhelm-3]

Nick,

The KPA100 board is a bit tight on the screws, but will fit (albeit just
barely) if it is held always parallel with the heat sink - but it
usually is not - there may also be a tiny bit of a curve to the board
which makes it more difficult.

Just push it on, pushing at each screw location a bit at a time and when
it is time to remove it, pry it up with a wide flat blade screwdriver or
similar tool (look under the board to be certain the blade does not
contact any of the capacitors mounted on the bottom).

It gets easier every time it goes on and off, but I have never found one
that slips off easily.

73,
Don W3FPR

Nick Henwood wrote:
> I am  trying to fit the PC to the heat sink but there is not a neat match of set screws to holes in the PC. No problems in screwing the set screws into the heat sinks (i.e. certainly not cross-threaded) but there is a tiny mismatch. I am very very reluctant to use any force (and I have to get it back off anyway).
> Anyone else have this problem and any suggestions? Maybe a comment will make a change from K3 frenzy (and yes it does look great!)
> 73
> Nick G3RWF
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[Tom Zeltwanger]

As usual, Don's comments are right on. Mine was also very tight. Just check to
make sure you can see the top of the screw at each hole. You might try using a
nut driver and going to each hole and pressing right on the pad. That puts all
the pressure where the fastener is, and reduces chance of damage on the PC
board.

73,

Tom KG3V


Quoting Don Wilhelm <[hidden email]>:

> Nick,
>
> The KPA100 board is a bit tight on the screws, but will fit (albeit just
> barely) if it is held always parallel with the heat sink - but it
> usually is not - there may also be a tiny bit of a curve to the board
> which makes it more difficult.
>
> Just push it on, pushing at each screw location a bit at a time and when
> it is time to remove it, pry it up with a wide flat blade screwdriver or
> similar tool (look under the board to be certain the blade does not
> contact any of the capacitors mounted on the bottom).
>
> It gets easier every time it goes on and off, but I have never found one
> that slips off easily.
>
> 73,
> Don W3FPR
>
> Nick Henwood wrote:
> > I am  trying to fit the PC to the heat sink but there is not a neat match
> of set screws to holes in the PC. No problems in screwing the set screws into
> the heat sinks (i.e. certainly not cross-threaded) but there is a tiny
> mismatch. I am very very reluctant to use any force (and I have to get it
> back off anyway).
> > Anyone else have this problem and any suggestions? Maybe a comment will
> make a change from K3 frenzy (and yes it does look great!)
> > 73
> > Nick G3RWF
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft   
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

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