PRODUCT SUPPORT MANUAL Y1-03-0014 (25-60-01) Overhaul Manual with Illustrated Parts List Rev. R EM-1A, EM-1D™ Product No. 2204, 2208 FAA PMA Approved under A3-06-1402- 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.
TABLE OF CONTENTS SECTION TITLE PAGE 1.0 Description 1 2.0 Technical Data 1 3.0 Operation 2 4.0 Cleaning 4 5.0 Battery Replacement 4 6.0 Testing 4 7.0 Trouble Shooting 5 8.0 Disassembly 6 9.0 Inspection Check 6 10.0 Repair 6 11.0 Assembly 7 12.0 Parts List 9 Figure 1 Block Diagram ACR/EM-1A & EM-1D Portable Safety Megaphone 3 Figure 2 Illustrated Parts List ACR/EM-1A & EM-1D Portable Safety Megaphone 8 ILLUSTRATION 1 Y1-03-0014 Rev.
1.0 DESCRIPTION 1.1 The ACR/EM-1A, 1D 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. It has a 90° sound projection angle to direct the sound to persons in its immediate vicinity, as well as in the rear sections of any aircraft.
Gain Control* Thumb operated Amplifier Integrated circuit, 2 watts power output Speaker Re-entrant horn and driver type; input power five (5) watts; 90° dispersion angle Microphone High Sensitivity Batteries Six (6) standard 1½ volt “AA” cells Power Drain 25 milliamps static current 550 milliamps maximum current Frequency Response 500 to 3500 Hz Anti-Removal Alarm* Warbling tone 500 – 1200 Hz Alarm Actuator* Battery Test Circuits Plug pin, retained by nylon cord Visual Flashing Green LED* A
3.4 Adjust the volume control knob to a suitable sound level. The volume control may be adjusted with the thumb of the same hand holding the megaphone.* 3.5 When not in use, carry the megaphone by the neck strap, attached to top of unit. VISUAL BATTERY CHECK SPEAKER ASSEMBLY LED VOLUME CONTROL AUDIO AMPLIFIER SIREN CIRCUIT & BATTERY MONITOR MEGAPHONE SUB-ASSEMBLY MICROPHONE ASSEMBLY - + + N.O. * ALARM PLUG PIN N.C.
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 5.0 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.
then the amplifier. If the sound character is abnormal, check the batteries and then the siren circuitry.* 6.3 If no sound is heard, remove the microphone and mouthpiece assembly and the batteries. Check that both the microphone and battery contacts are clean. If not, clean with a mild, non-abrasive cleaner such as alcohol. 6.4 Test amplifier and speaker assembly by replacing the microphone with a spare microphone assembly.
.0 DISASSEMBLY (see Figure 2) 8.1 9.0 Remove microphone and mouthpiece assembly (2) by removing the three set screws (3). 8.1.2 Remove battery cells (4) from the three tubes by tilting megaphone to allow cells to drop out into the hand. 8.1.3 Unplug alarm plug pin (5) from side of housing.* 8.1.4 Remove volume control knob (6) (pulls off). 8.1.5 Remove the three oval head screws (11) at periphery of the speaker end of the housing (15). 8.1.
11.1 Assembly of the megaphone is in reverse order of disassembly. Follow these instructions: 11.1.1 Attach Horn (18) and Speaker Assembly (7) to Megaphone Subassembly (10). Ensure alignment with location pins. Pass speaker wires through the provided slot. 11.1.2 Plug speaker connector into the "out" header on PCB. 11.1.3 Push entire assembly gently into the housing (15), until it stops. Turn clockwise 45° and push all the way in. Turn counterclockwise 45° and align holes. 11.1.4 Secure with screws (11).
FIGURE 2 ACR / EM-1A, EM-1D PORTABLE SAFETY MEGAPHONE ILLUSTRATED PARTS LIST 8
12.0 PARTS LIST 12.1 ITEM QTY 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” column., In this case, replacement parts can be obtained directly from the original manufacturer. Standard parts (MS-, AN-, etc.) and commercially available hardware (‘Commercial’) should be obtained from commercial sources.
