3. Position the LMO and circular dial on the chassis using care that the circular dial does not
fall off of the shaft.
4. Start the four nuts (and lock washers) that hold the LMO to the chassis. Make sure the
screws are in the center of the slots, that the LMO is squared up to the front panel, and the
LMO shaft is centered behind the hole in the front panel escutcheon before tightening the
nuts.
5. Replace the assemblies located on the top of the LMO that were removed earlier making
sure that the spiral groove follower pin is engaging the pointer on the slide rule dial
6. Insert a small screwdriver through the hole in the front panel escutcheon and turn the LMO
shaft fully counter clockwise until it hits the stop.
7. With the circular dial at 90 and the slide rule pointer near 0, slide the circular dial back on
the LMO shaft while engaging the spiral groove follower in the inner most groove of the
circular dial. Temporarily tighten the set screw holding the circular dial.
8. Reconnect the wires to the terminal strip on the rear of the LMO
9. Plug the coax cable into the LMO output socket on the rear of the LMO
10. It may be necessary to move the circular dial forward or backward to obtain smooth
operation of the spiral groove mechanism while turning the LMO shaft using a screw driver.
11. Re-engage the main tuning shaft pulley as described in Re-engaging the Main Tuning Pulley
on page 68.
12. It will be necessary to perform the circular dial calibration as described in Dial Calibration on
page 67.
13. Replace the large tuning knob and reconnect the power cable.
Heathkit Linear Master Oscillators (LMOs) Page 123
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