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PRODUCT
SUPPORT
MANUAL
Y1-03-0057
(25-60-06)
Overhaul Manual
with Illustrated Parts List
Rev. F
EM-2BA™
Product No. 2206
FAA PMA Approved under A3-06-1405
Portable Safety Megaphone
ACR Electronics, Inc.
5757 Ravenswood Road
Fort Lauderdale, Fl 33312
+1(954) 981-3333 • Fax +1 (954) 983-5087
www.acrelectronics.com
Email: Info@acrelectronics.com
A Chelton Group company
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Related Manuals for ACR Electronics EM-2BA MEGAPHONE
Summary of Contents for ACR Electronics EM-2BA MEGAPHONE
- Page 1 Illustrated Parts List Rev. F EM-2BA™ Product No. 2206 FAA PMA Approved under A3-06-1405 Portable Safety Megaphone ACR Electronics, Inc. 5757 Ravenswood Road Fort Lauderdale, Fl 33312 +1(954) 981-3333 • Fax +1 (954) 983-5087 www.acrelectronics.com Email: Info@acrelectronics.com A Chelton Group company...
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Page 2: Table Of Contents
TABLE OF CONTENTS SECTION TITLE PAGE Description Technical Data Operation Cleaning Battery Replacement Testing Trouble Shooting Disassembly Inspection Check 10.0 Repair 11.0 Assembly 12.0 Parts List ILLUSTRATION Figure 1 Block Diagram ACR/EM-2BA Portable Safety Megaphone Figure 2 Illustrated Parts List ACR/EM-2BA Portable Safety Megaphone Y1-03-0057 Rev. -
Page 3: Description
DESCRIPTION The ACR/EM-2BA is a battery operated solid state megaphone specifically developed for use in enclosed areas such as in the interior of an aircraft or ship cabin. It has been designed to minimize regenerative acoustic feedback that results in whistling and other oscillations of this nature. -
Page 4: Operation
Batteries Six (6) standard 1½ volt “AA” cells Power Drain 25 milliamps static current 550 milliamps maximum current Frequency Response 500 to 3500 Hz Battery Test Circuits Visual Flashing Green LED OPERATION To test the battery, squeeze the handle and note if the green LED (located near the volume control cap) is flashing. -
Page 5: Cleaning
SPEAKER VOLUME ASSEMBLY CONTROL AUDIO AMPLIFIER SIREN CIRCUIT & MICROPHONE BATTERY MONITOR ASSEMBLY MEGAPHONE SUB-ASSEMBLY N.O. BATTERY N.C. PACK HANDLE SWITCH FIGURE 1 BLOCK DIAGRAM ACR/EM-2BA PORTABLE SAFETY MEGAPHONE CLEANING External surfaces of the megaphone may be cleaned with a soft cloth, dampened in a solution of mild household detergent. -
Page 6: Testing
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. -
Page 7: Troubleshooting
TROUBLESHOOTING Testing procedure for locating defects is given in paragraph 6.0. Possible faults and corrections are summarized below for ready reference. TROUBLE POSSIBLE CAUSE CORRECTION No sound from speaker Exhausted batteries, Replace defective when handle is squeezed defective microphone, component (Step 6.1) speaker or amplifier assembly... -
Page 8: Inspection Check
8.1.6 Disassembly in steps 8.1.1 through 8.1.5 above is sufficient to examine the megaphone for faults and testing. Further disassembly is not recommended. INSPECTION / CHECK Inspect unit for any evidence of damaged parts, loose mountings or broken leads and dirty electrical contacts. 10.0 REPAIR 10.1... - Page 9 11.1.7 Replace microphone and mouthpiece assembly (2). Align keyway, and secure with the three setscrews (3). 11.1.8 Steps 11.1.1 through 11.1.7 complete the assembly of the megaphone. After assembly, test unit in accordance with Paragraph 6.0, Testing. Y1-03-0057 Rev. F...
- Page 10 FIGURE 2 ACR / EM-2BA PORTABLE SAFETY MEGAPHONE ILLUSTRATED PARTS LIST...
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Page 11: Parts List
12.0 PARTS LIST 12.1 Replaceable parts are illustrated in Figure 2, and listed below in the table. Part numbers shown in the “Part Number” column may be ordered from ACR unless another manufacturer’s name is given in parenthesis in the “Description”...