Scott,
There is no need to remove the membrane switch assembly to replace the
encoder at the VFO B location on the KX3. I just examined a CP board
assembly to verify this.
However, a lot of heat (not high temperature! they aren't the same!) is
needed to unsolder the frame mounting lugs.
My approach would be to melt a small amount of ChipQuik on the 5 pins as
well as the two lugs using a soldering iron set too a temperature too
low low to melt regular solder, ensuring the ChipQuik has blended with
the solder. Might need a bit more at those pesky lugs.
Then use a hot-air gun to warm those pads simultaneously. The VFO B
encoder should then easily come off the board without damaging or
loosening any other parts.
I would be very hesitant to do this without using ChipQuik or its
equivalent to lower to melting point temperature at those seven
connection points. Repairing a heat-damaged PCB can be quite expensive.
73,
Lyle KK7P (who designed this particular board in the KX3 product)
On 7/21/18 3:06 PM, Scott Manthe wrote:
> The VFO B encoder in my KX3 is defective. I've decided that I'd to try
> and change it myself. My question is has anyone removed rubber button
> membrane/pad from the circuit board.
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