MFJ-941EK Tuner Kit Instruction Manual
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CONSTRUCTION
Tuner wiring is now complete. Before going on, check all solder connections and
hardware for security. The next stage is final assembly.
Find the following items to complete the Antenna Selector Switch assembly:
(1) 1/4" ID Heyco Nylon Shaft Bushing
(1) 1/4" ID x 1/2" OD x 3/4" Shaft Coupler
(1) 1/4" x 3-1/2" Metal Shaft with 1/2" Flatted End
(2) 3/32" x 10-32 set screw, hex head
(1) 1" OD Knob, Black with Silver Insert
Install the Antenna Selector shaft and knob as described below:
[ ] Insert the Heyco nylon bushing into the front panel at Antenna Selector.
[ ] Start two #10 Allen set screws into the shaft coupler (3/32" Allen Wrench).
[ ] Install the shaft coupler on SW4. Secure rear set screw with a Allen wrench.
[ ] Insert round end of shaft through the front panel bushing and into the coupler.
[ ] Temporarily secure front set screw using an Allen wrench.
[ ] Install the 1" knob, aligning its set screw with the flatted side of the shaft.
[ ] Tighten the knob in place with a 5/64" Allen wrench.
[ ] Rotate the switch fully counter-clockwise to its stop.
[ ] Loosen front shaft-coupler screw, rotate knob to Dummy Load on the left side.
[ ] Re-tighten the coupler set screw. Rotate knob and confirm pointer alignment.
Find these remaining items to complete final assembly:
(3) 1" OD Knob, Black with Silver Insert
(1) 3/8" OD Plastic Pushbutton, Red
(1) 3/8" OD Plastic Pushbutton, Black
[ ] Fully mesh Transmitter capacitor plates. Install knob with pointer at "0".
[ ] Fully mesh Antenna capacitor plates. Install knob with pointer at "0".
To align the knob on the Inductor switch, first locate the switch's "home" or open
position. Looking at the rear of the switch wafer, the wiper ring and selector tab
should be aligned, as shown below. If not, temporarily install a knob and advance
the switch until the two are aligned. See Diagram 13.
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