TM 9-6115-730-24
0041
TESTING - Continued
FREQUENCY Adjust Potentiometer Test
1. Disconnect wires from terminals 26, 27, and 28 of LSM A4.
2. Set multimeter to measure 10,000 ohms and connect multimeter leads to wires removed from terminals
27and 28 of LSM A4.
3. Rotate potentiometer shaft counterclockwise as far as it will go.
4. Slowly and smoothly rotate FREQUENCY adjust potentiometer shaft clockwise as far as it will go while
observing multimeter and note indication.
5. Connect multimeter leads to wires removed from terminals 26 and 27 of LSM A4.
6. Rotate potentiometer shaft clockwise as far as it will go.
7. Slowly and smoothly rotate FREQUENCY adjust potentiometer shaft counterclockwise as far as it will go
while observing multimeter.
8. Multimeter indication shall increase at an even rate from 0-10,000 ohms for each setup. Maximum resistance
may vary + or 1000 ohms.
9. If multimeter indication changes erratically or is not at maximum ohms when rotation is complete, the
potentiometer is defective and must be replaced.
10. If there is no continuity at any position of potentiometer, troubleshoot wiring between potentiometer and LSM
A4 or replace potentiometer.
END OF TASK
ASSEMBLY
1. If removed, remove label (Figure 1, Sheet 4, Item 98).
2. Install PUSH TO STOP EMERGENCY STOP switch (Figure 1, Sheet 4, Item 97), two block contacts (Figure
1, Sheet 4, Item 96) and (Figure 1, Sheet 4, Item 95), seal (Figure 1, Sheet 4, Item 94), nut (Figure 1, Sheet
4, Item 93), and lens (Figure 1, Sheet 4, Item 92).
3. Install seal washer (Figure 1, Sheet 4, Item 91), AC CIRCUIT INTERRUPTER switch (Figure 1, Sheet 4,
Item 90), four screws (Figure 1, Sheet 4, Item 89), washer (Figure 1, Sheet 4, Item 88), and nut (Figure 1,
Sheet 4, Item 87).
4. Install seal (Figure 1, Sheet 4, Item 86), ENGINE CONTROL switch (Figure 1, Sheet 4, Item 85), four screws
(Figure 1, Sheet 4, Item 84), knob (Figure 1, Sheet 4, Item 83), and screw (Figure 1, Sheet 4, Item 82).
5. Install seal (Figure 1, Sheet 4, Item 81), BATTLE SHORT switch (Figure 1, Sheet 4, Item 80), switch guard
(Figure 1, Sheet 4, Item 79), anti-rotation washer (Figure 1, Sheet 4, Item 78), washer (Figure 1, Sheet 4,
Item 77), and nut (Figure 1, Sheet 4, Item 76).
6. Install FREQUENCY adjust potentiometer (Figure 1, Sheet 4, Item 75), seal (Figure 1, Sheet 4, Item 74), nut
(Figure 1, Sheet 4, Item 72), and knob (Figure 1, Sheet 4, Item 71). Repeat for VOLTAGE adjust
potentiometer (Figure 1, Sheet 4, Item 73).
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