FS A12SA Amdt.A Voice Gun Electronic Megaphone User Manual

Voice Gun electronic megaphone

A12SA Amdt.A

ref. 2020118-01

FEDERAL SIGNAL VAMA, S.A.
C/Dr.Ferrán,7(08339)VILASSAR DE DALT – SPAIN
Tel: (34) 93.741.79.00
Telefax: (34) 93.753.03.62
WEB: www.fedsigvama.com

C:\ ARCHIVO\ DOCUMENT\ VARIOS
REF. DOC.91472002
F.U.R.: 24/02/22 REVISIÓN 7

A12SA Amdt.A, Voice Gun electronic megaphone Ref. 2020118-01

Specifications

Output power:                     16 W
Current consumption:         160-200 mA
Voltage:                                12 V, 8 AA batteries.
Amplifier:                             3-stage, Class B output.
Speaker:                                Re-entrant horn and driver type.
Microphone:                         Noise-cancelling, magnetic.
Megaphone material:            Lexan, red.
Carrying strap:                      Nylon, adjustable.
Weight (with batteries):        1.4 kg

Operation

GENERAL DESCRIPTION

The Federal Signal Vama Voice Gun (Model A12SA Amdt.A ) electronic megaphones are designed for long, trouble-free service and simple operation. The following should be observed to obtain maximum results:
A. Operating power for the electronic megaphone is supplied by eight AA size batteries (not supplied). To install batteries, apply slight pressure with thumb against battery cartridge at bottom of handle. Remove locking thumb screw (if tight, screw may be started with a thin coin). Remove cartridge. All batteries should be placed in position with the small copper battery tip pointing away from the springs at the top and bottom of the cartridge. Standard AA size alkaline batteries are recommended for greater volume and life.

CAUTION

Do not use mercury cells. Polarity of mercury cells is reversed and damage to the instrument May result.
B. The Class B amplifier draws very little current, even with the trigger button depressed, except when actually speaking into the microphone. This results in excellent efficiency and long battery life. In instances where the electronic megaphone is used for short periods a few times a week, batteries may last from six months to one year. Batteries should be replaced at least yearly to avoid possibly exceeding their shelf life.

WARNING

Your hearing and the hearing of others, close to the electronic megaphone, could be damaged by loud sounds. This can occur from short exposures to very loud sounds, or from longer exposures to moderately loud sounds. For hearing conservation guidance, refer to community, state, or local recommendations.

Operation of the electronic megaphone is very simple. The following steps should be observed to obtain maximum results.

A. The electronic megaphone is operated by simply pressing the trigger button and speaking into the microphone. The button should be depressed only when actually speaking.
B. Hold the electronic megaphone with one hand. Do not place other hand around mouthpiece. The unit has been designed with a crisp response to increase intelligibility, particularly when used under noisy conditions. If operated in a small empty room, a slight ringing sound may be noticed.
C. For simplicity, no external volume control is used. Volume is controlled entirely by voice intensity. FOR BEST RESULTS AND UNVARYING SOUND REPRODUCTION, LIPS SHOULD BE PLACED IN CONTACT WITH MICROPHONE HOUSING.
D. For maximum intelligibility and effectiveness, be sure the open bell side of the Voice Gun is facing those you are speaking to.

NOTE

Volume is preset at the factory and normally should not need readjustment. If and when necessary, it can be adjusted by removing rubber plug on horn at rear of handle and inserting small screwdriver. Turning control to the left decreases microphone sensitivity and turning to the right (clockwise) increases sensitivity. Control should be set just below the point of feedback under existing conditions.
Rubber plugs should be reinserted, forcing it in place with a small screwdriver.

1. microphone
2. Volume adjustment plug
3. batteries cartridge
4. speaker
5. trigger button

Service and Maintenance

CLEANING

Molded parts of the Voice Gun electronic megaphone are made of exceptionally tough and rugged material. When cleaning molded parts, use a damp cloth and mild detergent. Do Not use solvent or strong cleaning agents.

BATTERY REPLACEMENT

Power is supplied by eight AA size batteries. At least 1500 to 3000 ten-second messages should be expected from one set of batteries.
It is recommended that batteries be replaced yearly, even though still functioning. For longer shelf life and much longer operating life, we recommend use of alkaline batteries.
To remove batteries, proceed as follows:
A. Apply slight pressure with thumb against battery cartridge at bottom of handle.
B. Remove locking thumb screw. If tight, screw may be started with a thin coin.
C. Remove cartridge.
D. All batteries should be placed in position with the small battery tip pointing away from the springs at the top and bottom of the cartridge (see figure).

Figure 1. Batteries cartridge.

TROUBLESHOOTING

A. No sound reproduced. No “click” heard in speaker when switch button is depressed. Proceed with the following steps:

1. Check for dead or extremely weak AA 1.5V batteries or one or more dead cells.
2. Check for proper installation of batteries in cartridge.
3. Reinstall cartridge and batteries in handle.

If the previous checks do not reveal trouble, the amplifier assembly is defective and should be replaced or repaired.

REPARATION SERVICE

Should the electronic megaphone not function, or not function properly after proper installation of good batteries, it is suggested that the factory be contacted. Describe briefly what the difficulty seems to be. Communications should be addressed to:

Service Department
Federal Signal Vama
National telephone: 93.450.69.87
International telephone: 34.450.69.88
C/Dr. Ferrán, 7 (08339), Vilassar de Dalt
Spain

Figure 2. Spare parts electronic megaphone A12SA Amdt.A ref. 2020118-01.

Spare parts

References

• Inicio - Federal Signal Vama

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