TM 10-8145-222-23
0082
REPAIR CONTINUED
Replace Alarm Horns
NOTE
There are two alarm horns on the Control Panel Assembly COMPARTMENT 1
TEMP ALARM OVER/UNDER horn HN1, and COMPARTMENT 2 TEMP ALARM
OVER/UNDER horn HN2. This procedure is applicable to the replacement of either
alarm horn.
1. Remove top two screws (Figure 4, Item 1) and bottom two nuts (Figure 4, Item 2) securing control panel cover
(Figure 4, Item 3).
2. Carefully pull control panel cover (Figure 4, Item 3) out and away from control panel to access wiring (Figure 4,
Item 4).
3. Tag and disconnect wiring (Figure 4, Item 4) to alarm horn (Figure 4, Item 5).
4. Loosen and remove knurled nut (Figure 4, Item 6) securing alarm horn (Figure 4, Item 5) to control panel cover
(Figure 4, Item 3).
5. Remove alarm horn (Figure 4, Item 5).
6. Install replacement alarm horn (Figure 4, Item 5) into control panel cover (Figure 4, Item 3) and secure with
knurled nut (Figure 4, Item 6).
7. Reconnect wiring (Figure 4, Item 4) to alarm horn (Figure 4, Item 5) as tagged. Remove tags.
8. Install control panel cover (Figure 4, Item 3) onto control panel and secure top with two screws (Figure 4,
Item 1) and bottom with two nuts (Figure 4, Item 2).
9. Reconnect battery negative (-) terminal (WP 0053, Reconnect).
10. Start refrigeration unit (TM 10-8415-222-10, Operating Procedures).
11. Operate refrigeration unit in accordance with normal operating procedures to verify proper operation after
replacement of alarm horns (TM 10-8415-222-10, Operating Procedures).
12. Close and secure control panel assembly access door (Figure 4, Item 7).
13. Place MTRCS back into desired mode of operation (TM 10-8415-222-10, Operating Procedures).
0082-7