ACR Electronics EM-1A MEGAPHONE Istruzioni per l'installazione

EM-1A, EM-1D™

PRODUCT

SUPPORT

MANUAL

Y1-03-0014

(25-60-01)

Overhaul Manual

with Illustrated Parts List

Rev. R

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: [email protected]

A Chelton Group company

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

ILLUSTRATION

Figure 1 Block Diagram 3

ACR/EM-1A & EM-1D

Portable Safety Megaphone

Figure 2 Illustrated Parts List 8

ACR/EM-1A & EM-1D

Portable Safety Megaphone

Y1-03-0014 Rev. R

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.

The amplifier frequency band-pass has been selected to produce a crisp,

clear reproduction of voice signals. The operating power level is also

sufficient to provide adequate sound under high ambient noise level

conditions without being over-powering. Specific attention has been

given to the physical size so that it can be used effectively in a crowded

environment.

The EM-1A & EM-1D are the same except for installed options:

OPTIONS MATRIX

MODEL MANUAL GAIN ALARM ACTUATOR BATTERY MONITOR

Visual Audible

EM-1A Yes Yes Yes No

EM-1D Yes No Yes Yes

1.2 The integrated circuit amplifier only uses a small current when turned

“ON”. Large currents necessary to drive the speaker are utilized only on

voice peaks. This extends the life of the batteries so that several hours of

operation may be expected when used normally in an intermittent manner.

Batteries should be replaced periodically as recommended by the

manufacturer. (See section 5.0) A simplified block diagram of the

megaphone is shown in Figure 1.

2.0 TECHNICAL DATA

Dimensions 5.5” max diameter bell, 11.5” max long

Weight 2.3 lbs., including batteries

Materials Horn, handle – Anodized Aluminum

Housing – Aluminum

Attachment Neck strap at top of unit

Y1-03-0014 Rev. R

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* Plug pin, retained by nylon cord

Battery Test Circuits Visual Flashing Green LED*

Acoustical Beep*

*Optional feature (see options matrix)

3.0 OPERATION

3.1 A siren, incorporated into the megaphone, is automatically activated by

unplugging the alarm plug pin.*

Note: A long lanyard with an alarm plug pin is supplied with the

megaphone for use as an anti-theft alarm (optional).

3.2 Squeezing the handle automatically stops the siren, and the megaphone is

ready for use. Re-insert the alarm pin so that alarm will not be reactivated

when pressure on the handle is removed.

3.3 Hold the megaphone in one hand. Place mouth almost in contact with the

microphone mouthpiece at the rear of the assembly. Squeeze the handle,

which will flex slightly, turning the megaphone “ON” and speak slowly

with loud, crisp, clear tones.

Megaphones without the optional gain control knob are preset to a

standard level via control under access hole plug.

Y1-03-0014 Rev. R

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.

VOLUME

CONTROL

MICROPHONE

ASSEMBLY

AUDIO AMPLIFIER

SIREN CIRCUIT &

BATTERY MONITOR

MEGAPHONE

SUB-ASSEMBLY

BATTERY

PACK

(6 x AA)

LED

VISUAL

BATTERY

CHECK

SPEAKER

ASSEMBLY

N.O.

N.C.

HANDLE

SWITCH

ALARM

PLUG PIN

FIGURE 1

BLOCK DIAGRAM

ACR/EM-1A, EM-1D PORTABLE SAFETY MEGAPHONE

3.6 Battery Monitor

Two types of battery monitor are available on the EM-1 series

megaphones.*

Visual - when megaphone is activated by squeezing the handle, a green

LED indication means the remaining battery capacity is greater than 50%

of initial capacity. If the green LED is out, replace batteries.

Y1-03-0014 Rev. R

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

Y1-03-0014 Rev. R

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. If no sound can be produced after

microphone replacement, it may be assumed that the amplifier or speaker

assembly is defective.

6.5 To test the speaker, disassemble the speaker. Disconnect one wire and

apply 1 ½ volts intermittently across the speaker. If no clicks are heard,

the speaker is defective.

* Optional Feature (see options Matrix)

7.0 TROUBLESHOOTING

7.1 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 when

handle is squeezed (Step 6.1) Exhausted batteries, defective

microphone, speaker or amplifier

assembly

Replace defective component

No siren when alarm pin is pulled

(Step 6.2)* Exhausted batteries, defective

siren circuitry or defective

amplifier

Replace defective component

Sound is abnormally low or

distorted Exhausted batteries or wrong

polarity of battery series Check proper insertion of

batteries or replace batteries.

Speaker does not respond to Step

6.5 Defective speaker Replace speaker

*Optional Feature (see options Matrix)

Y1-03-0014 Rev. R

8.0 DISASSEMBLY (see Figure 2)

8.1 Megaphone should be disassembled for repair or replacement of

components only.

8.1.1 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).

8.1.6 Extract speaker (7) and megaphone assembly (10) by firstly

turning horn (18) clockwise 45°. Pull entire assembly gently until

it stops. Turn horn (18) counterclockwise 45°, then pull the entire

assembly out.

8.1.7 Separate Speaker Assembly (7) and Megaphone Subassembly (10)

by firstly unplugging the speaker wires from the "out" header.

Remove hex screw that holds the assemblies together.

8.1.8 Disassembly in steps 8.1.1 through 8.1.7 above is sufficient to

examine the megaphone for faults and testing. Further

disassembly is not recommended.

9.0 INSPECTION / CHECK

9.1 Inspect unit for any evidence of damaged parts, loose mountings or broken

leads and dirty electrical contacts.

10.0 REPAIR

10.1 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.

11.0 ASSEMBLY

Y1-03-0014 Rev. R

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).

11.1.5 Replace volume control knob (6) on volume control shaft.

11.1.6 Plug the alarm plug (5) attached to lanyard into jack in the side of

the case near volume control.*

11.1.7 Replace the six batteries (4) in three tubes at microphone end of

megaphone case.

CAUTION: Observe polarity of batteries during installation

procedure (see instructions at battery tube openings of the

megaphone).

11.1.8 Replace microphone and mouthpiece assembly (2). Align keyway,

and secure with the three setscrews (3).

11.1.9 Steps 11.1.1 through 11.1.8 complete the assembly of the

megaphone. After assembly, test unit in accordance with

Paragraph 6.0, Testing.

FIGURE 2

ACR / EM-1A, EM-1D PORTABLE SAFETY MEGAPHONE

ILLUSTRATED PARTS LIST

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