Section IX. M42 ALARM UNIT TROUBLESHOOTING

TM 3-6665-302-34

3 Shim

5 Module

1 Pin

4 Fastener stud

2 Retaining ring

Figure 3-23. Electronic module, exploded view.

Section IX. M42 ALARM UNIT TROUBLESHOOTING

3-59. General

This section provides instructions for trouble-

shooting the M42 alarm unit at the direct sup-

port maintenance level. Figure 2-3 is a sche-

matic diagram of the M42 alarm unit.

3-60. Troubleshooting Procedures

a. Preliminary Procedures. Connect a power

source to the M74 test set (TM 3-6665-260-14).

b. Troubleshooting Chart. Figure 3-3 de-

scribes the use of the M42 alarm unit trouble-

shooting chart (fig. 3-24). The trouble-shooting

Section X. M42

3-61. General

Direct support maintenance personnel are au-

thorized to repair the M42 alarm unit by re-