PDF User Manual

Heavy Duty Headset

User Guide

PMLN5277

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DESCRIPTION

The PMLN5277 Behind the Head Heavy Duty 
Headset is intended for high noise 
environments, to provide privacy and noise 
isolation.

The headset consists of the following parts:

• Flexible Noise-Canceling boom 

microphone

• Ear cup Push-To-Talk button
• Behind the Head support band
• Cloth strap over the head for additional 

support

• Comfort Ear Seal with 24dB Noise 

Reduction Rating (NRR)

• Push-To-Talk (PTT) / Voice Operated 

Transmission (VOX) Switch

Figure 1.Behind the Head Model

VOX & PTT Switch

Over the Head Strap

Behind the Head Support band

Ear Seal & 

Cloth Covers

Ear cup  
Push-To-Talk
Button  

Headset Windscreen  

Mic  O-ring  

Noise Canceling Microphone  

Flexible Boom Assembly  

Cable 

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PUSH-TO-TALK (PTT) OPERATION:

1. Always switch the 

radio OFF

 before 

connecting the headset. 

2. Attach the audio connector to the radio 

taking care not to over tighten the fixing 
screw.

Note: 

Once the headset has been installed the 

radio speaker and the radio microphone 
are both disabled. The user must speak 
into the headset microphone and use 
the headset speaker to listen to 
incoming calls.

3. For Push-To-Talk operation, place the 

PTT/VOX switch in the PTT mode. 
Switch the radio ON. Care should be 
taken not to set the volume level too 
loud.

4. The flexible boom mounted Noise 

Canceling microphone should be 
positioned approximately 1.2 cm to 2.0 
cm (½ inch to ¾ inch) from the user’s 
lips. Adjust the flex boom assembly to 
this position. Do not twist the Noise 
canceling module with windscreen, 
either clockwise or counterclockwise to 
avoid poor noise cancellation 
performance.

5. Press the 

Ear cup Push-To-Talk button

located at the top of the left ear cup and 

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speak into the headset microphone to 
check that the two-way communication 
is working, the 

radio-in-transmission 

light (LED)

 will be illuminated.

6. Release Push-To-Talk button to receive 

transmissions.

7. Always switch the 

radio OFF

 before 

disconnecting the headset.

VOICE OPERATED TRANSMISSION (VOX) 
OPERATION:

1. Always switch the 

radio OFF

 before 

connecting the headset. 

2. Attach the audio connector to the radio, 

taking care not to over tighten the fixing 
screw.

Note: 

Once the headset has been installed the 

radio speaker and the radio microphone 
are both disabled. The user must speak 
into the headset microphone and use 
the headset speaker to listen to 
incoming calls.

3. For VOX operation, place the PTT/VOX 

switch in the VOX mode. Switch the 
radio ON. Care should be taken not to 
set the volume level too loud.

4. The flexible boom mounted Noise 

Canceling microphone should be 
positioned approximately 1.2 cm to 2.0 
cm (½ inch to ¾ inch) from the user’s 

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lips. Adjust the flex boom assembly to 
this position. Do not twist the Noise 
canceling module with windscreen, 
either clockwise or counterclockwise to 
avoid poor noise cancellation 
performance.

5. To transmit, speak clearly into the 

microphone. The transmitter will remain 
keyed for a short time after speaking.

REMOVING THE HEAVY DUTY HEADSET

1. Turn the 

radio off

 before removing the 

heavy duty headset from the radio 
accessory connector.

2. Remember to reattach the radio 

accessory connector seal to the side of 
the radio when an accessory is not in 
use. 

ACOUSTIC SAFETY

Exposure to loud noises from any source for 
extended periods of time may temporarily or 
permanently affect your hearing. The louder 
the radio’s volume, the less time is required 
before your hearing can be affected. Hearing 
damage from loud noises is sometimes unde-
tectable at first and can have a cumulative 
effect. 

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To protect your hearing :

• Use the lowest volume neccessary to do 

your job. 

• Increase the volume only if you are in noisy 

surroundings.

• Reduce the volume before connecting 

headset or earpiece.

• Limit the amount of time you use headsets 

or earpieces at high volume. 

• When using the radio without a headset or 

earpiece, do not place the radio’s speaker 
directly against your ear.

• If you experience hearing discomfort, ring-

ing in your ears, or speeches that are muf-
fled, you should stop listening to your radio 
through your headset or earpiece, and 
have your hearing checked by your doctor.

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REPLACEMENT PARTS

The replacement parts shown in Table 1 are 
available for the PMLN5277 Heavy Duty 
Headset.

Please contact your local Motorola 

Representative or Dealer for details.

IMPORTANT NOTE:

The Heavy Duty Headset is not field repairable. 

Table 1.   Replacement Parts

Description

Part Number

Foam Ear Seal

75012068001

Cloth Covers 

15012094001

Over the Head Strap

4204004K01

Mic O-Ring

6775998M01

Headset Windscreen

3578010A01

Eyeglass Pad

7575999M01

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NOTES

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© 2008, 2010 by Motorola, Inc.

b

 and Motorola are registered trademarks of 

Motorola, Inc. All Rights Reserved.

b

 et Motorola sont des marques déposées de 

Motorola, Inc.Tous droits réservés.

b

 y Motorola son marcas registradas de Motorola, 

Inc.Todos los derechos reservados.

b

 e Motorola são marcas registradas da Motorola, Inc.

Todos os direitos reservados. Impresso nos EUA.

b

 und Motorola sind eingetragene Warenzeichen von 

Motorola, Inc. Alle Rechte vorbehalten.

b

 e Motorola sono marchi depositati di Motorola, Inc.

Tutti i diritti riservati.

b

 e Motorola são marcas comerciais registadas da 

Motorola, Inc. Reservados todos os direitos.

b

 en Motorola zijn wettig gedeponeerde 

handelsmerken van Motorola, Inc. Alle rechten 
voorbehouden.

b

и

 Motorola 

являются

зарегистрированными

товарными

знаками

компании

 Motorola, Inc. 

Все

права

сохраняются

.

*6875937M01*

6875937M01-B

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