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
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