Repair; Disassembly And Assembly; Disassembly - ACR Electronics 2204B Product Support Manual

TROUBLE
No sound from speaker when
handle is squeezed (Step 1).
No siren when alarm pin is
pulled (Step 2, ACR/EM-1A
only).
Sound is abnormally low or
distorted.
Speaker does not respond to
Step 5.

4.2 Repair

The megaphone consists of three major sub-assemblies; the microphone and mouthpiece assembly, the
megaphone sub-assembly, and the horn and speaker assembly. Repairs are restricted to the replacement
of these defective sub-assemblies or the batteries and lanyard assemblies.

5. Disassembly and Assembly

5.1 Disassembly

Megaphone should be disassembled for repair or replacement of components only.
1. Remove the microphone and mouthpiece assembly by removing the three set screws.
2. Remove battery cells from the three tubes by tilting megaphone to allow cells to drop out into
the hand.
3. Unplug alarm plug pin from side of housing. (ACR/EM-1A only)
4. Remove volume control knob. (does not apply to ACR/EM-2BA)
5. Remove the three oval head screws at periphery of the speaker end of the housing.
6. Extract speaker and megaphone assembly by first turning horn clockwise 45°. Pull entire
assembly gently until it stops. Turn horn counterclockwise 45° then pull the entire assembly out.
7. Separate speaker assembly and megaphone subassembly by first unplugging the speaker wires
from the "out" header. Remove hex screw that holds the assemblies together.
8. FURTHER DISASSEMBLY IS NOT RECOMMENDED.
Inspect unit for any evidence of damaged parts, loose mountings or broken leads, and dirty electrical
contacts.
Y1-03-0340 Rev. C
ACR ELECTRONICS, INC.
Product Support Manual
Portable Safety Megaphone
POSSIBLE CAUSE
Exhausted batteries, defective
microphone, speaker or amplifier
assembly.
Exhausted batteries, defective
siren circuitry or defective
amplifier.
Exhausted batteries or wrong
polarity of battery series.
Defective speaker
Company Confidential
CORRECTION
Replace defective component.
Replace defective component.
Check proper insertion of
batteries or replace batteries.
Replace speaker
8