TESTING - TM-9-4120-428-140146

TM 9-4120-428-14

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4. Remove three self-locking machine screws (9) and washers (10) from the spacer posts (28) and pull the designation plate

(11) and mounting plate (12) away from the rest of the module.

5. Remove the nut (13) and washer (14) and pull the evaporator fan speed toggle switch (15) from the designation plate.

6. Remove pin (16) and spacers (17) from the circuit breaker toggles.

7. Remove screws (18) and flat washers (19) and pull the circuit breaker (20) from the designation plate (11).

8. Remove the two grommets (21) from the shaft holes in the designation plates (11). The designation plate (11) should fall

away from the mounting plate (12).

9. Remove the machine screws (22), washers (23), lock-spring washers (24), lock washer (25), and nut (26) from the rotary

switch relay (27).

10. Tag and disconnect wires from the rotary switch relay (27).

TESTING

Check continuity across the relay terminals. The electrical paths across 85 to 86, and 30 to 87A, should be closed.

All other paths should be open. If this is not the case, replace the relay.

REPLACEMENT

Replace the rotary switch relay if defective.

INSTALLATION

1. Assemble the machine screw (22), washer (23), lock-spring washer (24), lock-washer (25), and nut (26) to attach the

rotary switch relay (27) to the mounting plate (12). Tighten the screw/nut assembly so the rotary switch relay (27) is

held firmly in place.

2. Reconnect the wires to the relay terminals. Remove tags.

3. Place the designation plate (11) over the mounting plate (12) and hold in place.

4. Insert circuit breaker toggles through the designation plate (11). Be sure the OFF position matches the lettering on

the designation plate (11).

5. Secure the circuit breaker (20) to the designation plate (11) with screws (18) and flat washers (19).

6. Replace grommets (21) in the shaft holes. Check that they are secure.

7. Insert the evaporator fan speed toggle switch (15) into the designation plate (11), tighten the nut (13) and washer

(14) to secure the designation plate (11) to the spacer posts (28).

8. Insert the three self-locking machine screws (9) and washers (10) into the spacer posts (28) through the designation

plate (11). Tighten the screws to secure the designation plate (11) to the spacer posts.

9. Install the knob (4) and tighten the setscrew (3).

10. Insert the pin (16) and spacers (17) in the circuit breaker toggles.

11. Place the knob (6) on the mode selector switch (7). Make sure the adapter (8) is positioned on top of the square shaft

of the mode selector switch (7).

12. With the knob (6) and the adapter (8) engaged with the shaft, turn the switch in a clockwise direction.

13. When the last clockwise position is located, remove the knob (6) leaving the adapter (8) on the shaft. Reposition the

knob (6) on the adapter with the pointer pointing in the COOL mode.

14. Tighten the screw (5) in the top of the knob (6). When the knob (6) is secure, turn it to point in the OFF mode.

15. Slip the control cover (2) in place and secure it with four machine screws (1).

NOTE

FOLLOW-ON MAINTENANCE:

Install control module (WP 0029 00)

END OF WORK PACKAGE

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