Cleaning; Battery Replacement; Testing - ACR Electronics EM-1A MEGAPHONE Product Support Manual

Audible - when megaphone is activated by squeezing the handle, a chirp
heard in the speaker means the remaining battery capacity is greater than
50% of initial capacity. If beep is not present, replace battery.
4.0

CLEANING

4.1 External surfaces of the megaphone may be cleaned with a soft cloth,
dampened in a solution of mild household detergent. Do not immerse in
water or use strong solvents. Clean electrical contacts with cloth
dampened with isopropyl alcohol.
5.0 BATTERY REPLACEMENT (see Figure 2)
5.1 The power supply used in the megaphone consists of six standard 1 ½ volt
"AA" size batteries. Current drain is minimal (12 mA) with the
megaphone "ON", and increases when the user speaks into the
microphone.
5.2 Battery replacement is accomplished by removing three set screws (3)
while holding the microphone and mouthpiece assembly (2) in place. The
six battery cells, contained in three tubes with two cells per tube, are
immediately accessible and will drop out when the megaphone is tilted.
New batteries may be dropped into the tubes, observing polarity marking
adjacent to each tube.
5.3 Replace microphone and mouthpiece assembly (2). Align keyway and
secure with the three set screws (3).
CAUTION: Observe polarity of cells carefully before replacement.
6.0

TESTING

Note: The megaphone consists of three major assemblies; the microphone and
mouthpiece assembly, the megaphone sub-assembly, and the horn and
speaker assembly. To locate a defect, follow the procedure outlined
below:
6.1 Squeeze the handle. If a clicking sound is heard, the speaker is operating.
6.2 Remove the pin that activates the siren. If the alarm is of normal
amplitude and sound character, the amplifier and siren circuitry are
functioning properly. If the amplification is low, check the batteries and
5
Y1-03-0014 Rev. R