[Elecraft] K3 problem (vfoB knob problem)

[Geert Jan de Groot]

The A and B knob each have identical encoders that use plug-in boards to 
the front panel PCB. Chances are that the encoder isn't connected 
anymore (got loose).

Opening up the front panel should tell. Note that the A and B encoder 
are identical so you can swap them for testing.

Note that assembly of the front panel is quite fussy with distance 
rings, etc. You are well advised to keep notes of how the front panel 
was assembled when you take it apart. It also makes sense to have the 
assembler's manual at hand.

Recent adventures with swapping parts on an older K3 learned that the B 
encoder sits in a little deeper with the new VFO-B knob. As a result, in 
my case, the solder pins were touching (scratching) the front panel PCB. 
I fixed this by cutting the jumper pins flush and putting in some 
isolation, just to be sure.

I don't expect any broken parts, but some disassembly required. When you 
disassemble / re-assemble, be GENTLE with the volume knobs, they are 
known to split on older serial numbers.

Geert Jan