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 TM 55-1905-219-14-9
4-46.3. LOUD HAILER - MAINTENANCE INSTRUCTIONS (Continued).
(c)
Pistol-grip handle assembly.
1
In addition to providing a means of holding the loud hailer at its center of balance, this handle also
incorporates the controls for the battery supplies. The handle, is provided with a cover, held by three
screws, trigger switch is normally open until actuated by the *trigger. To apply battery power to the
amplifier, the two-position toggle switch selects either the circuit from the internal battery, or from the
external battery receptacle, the position being indicated on the switch plate "INT" and "EXT"
respectively. External battery power is furnished to the receptacle thru the external battery cable, when
the latter is connected to a 12 volt storage battery, by means of the spring clips. The positive clip is
marked with a plus sign, and is insulated by a red rubber boot. The negative clip is insulated by a black
rubber boot. It is important that each clip be connected to the battery post of the same corresponding
polarity, as the amplifier will not operate with the polarity reversed. The battery posts should be clean
and the clips adjusted so as to bite into the metal and the posts.
2
The handle is provided with a "D" ring, which a carrying strap or a safety lanyard may be fastened. The
cap and chain assembly for the battery receptacle is secured under one of the "D" ring mounting
screws.
d.
Preventative Maintenance.
(1) After long periods of storage, particularly at elevated temperatures, check the condition of the dry cells
and the contact springs in the battery holder. Inspect the microphone housing particularly. The opening to the
microphone should be kept free of dust, foreign matter, grease and oil and salt crystals. The microphone grille
cover should be removed occasionally and any such accumulated material as above should be removed. The
salt crystals left by the evaporation of salt water and spray should be dissolved with fresh water and rinsed
away after which the parts should be dried with a soft cloth or tissue.
(2) It is well to inspect the interior pistol-grip handle occasionally by removing the handle cover to see that
no salt or foreign matter has accumulated around the trigger or other parts in the interior. The power receptacle
should likewise be inspected and cleaned when necessary.
(3) After a time sand particles, cinders or the like may accumulate at the base of the horn. It is advisable
to invert the horn once in a while and shake out any foreign matter of this nature.
4-1174
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