Telex AIRMAN8P-0210 User manual

AIRMAN8+
AIRMAN8P‑0210 DOUBLE SIDE ANR+ HEADSET | AIRMAN8P‑0211
DOUBLE SIDE ANR+ HEADSET
en Customer Maintenance Manual

AIRMAN8+ Table of contents | en 3
Bosch Security Systems, LLC Customer Maintenance Manual 2020-07 | 01 | F.01U.387.060
Table of contents
1Record of revisions 4
2Purpose of manual 5
2.1 Technical support 5
2.2 Parts ordering 5
2.3 Repairs 5
2.4 Safety precautions 5
3Introduction 6
4Parts list and exploded view 8
4.1 Parts list 8
4.2 Exploded view 10
5Maintenance 11
5.1 Recommended maintenance schedule 11
5.2 Basic inspection 12
5.2.1 Physical inspection 12
5.3 Microphone troubleshooting 13
5.3.1 Validate continuity from plug to PCBA 13
5.3.2 Validate mic circuitry 14
5.3.3 Microphone/amplifier sensitivity test 14
5.3.4 Microphone sensitivity adjustment 14
5.4 Speaker troubleshooting 15
5.4.1 Speaker sensitivity and frequency response verification 15
5.4.2 Measure the resistance (plug to PCBA) 16
5.4.3 Validate the boom side PCBA 16
5.4.4 Validate the non-boom side PCBA 16
5.5 ANR troubleshooting 17
5.5.1 Measuring ANR circuit voltages and switch function 18
5.6 Cleaning the headset and connectors 19
5.7 Cleaning the ear cushions and headband pads 19
5.8 Replacing ear cushions and headband pads 19
5.9 Installing and replacing the hygenic covers 19
5.10 Replacing the windscreen 20
5.11 Headset storage 20
6Disassembly 21
6.1 Ear cushion replacement 21
6.2 Headband pad and headband pad replacement 22
6.3 Remove the mic prefilter 25
6.4 Remove the yoke assembly from the headband assembly 25
6.5 Boom side disassembly 25
6.6 Non-boom side disassembly 27
7Assembly 29
7.1 Boom side assembly 29
7.2 Non-boom side assembly 32
7.3 Attach the prefilter 35
7.4 Replace the yoke assembly on the headband assembly 35
7.5 Reinstall the headband cover 36
8Wiring Diagrams and Connectors 37

4en | Record of revisions AIRMAN8+
2020-07 | 01 | F.01U.387.060 Customer Maintenance Manual Bosch Security Systems, LLC
1 Record of revisions
Revision No. Revision Date Change Description
01 06/2020 Created

AIRMAN8+ Purpose of manual | en 5
Bosch Security Systems, LLC Customer Maintenance Manual 2020-07 | 01 | F.01U.387.060
2 Purpose of manual
This manual contains information for overhaul and servicing of the Airman 8+ headsets.
2.1 Technical support
A liaison between the customer and factory is provided by the Bosch Product Support
Department. Consultation and assistance on technical problems, part information, and
availability of local and factory repair facilities is available.
When writing, include all information concerning problems and mail to:
To find the proper address and phone number for your region, please reference https://
telex.com/aviation-solutions/about-telex-aviation-headsets/contact-telex-aviation/
2.2 Parts ordering
Replacement parts may be ordered from our parts department. When ordering, please include
the following information:
– Model Number
– Part Description
– Part Number
– Quantity
To find the proper address and phone number for your region, please reference https://
telex.com/aviation-solutions/about-telex-aviation-headsets/contact-telex-aviation/
2.3 Repairs
In order to maintain the FAA certification, all repairs to the headset must be made only by
persons authorized under Part 43 of the Federal Aviation Agency regulations. Bosch offers full
support, repair, and recertifcation.
2.4 Safety precautions
!
Caution!
This information is for use by qualified personnel only. Have all service work and repairs
performed by a trained technician.
– Unauthorized changes, modifications, or alterations to the product is prohibited.
!
Caution!
An ESD protection method should be applied before proceeding with any Mechanical/
Electrical instructions.
!
Caution!
Use of any replacement part, which does not have the same specifications, may cause
malfunction in the device and could make the product not air-worthy.
Notice!
Any material to be disposed of should be done according to local environmental laws.

6en | Introduction AIRMAN8+
2020-07 | 01 | F.01U.387.060 Customer Maintenance Manual Bosch Security Systems, LLC
3 Introduction
General Description
The Telex Airman 8+ is a lightweight noise-reducing headset designed specifically for
optimizing pilot communications in commercial and business turbine aircraft. Building on the
tradition of the Airman 850 and the Airman 8, Airman 8+ has improved durability, intelligibility,
and comfort. The Airman 8+ is among the lightest Active Noise Reduction headsets on the
market and one of only three FAA TSO C139a approved ANR headsets to utilize Telex’s
proprietary battery-free system. Soft pliable ear cushions and headband pads combine with
dual direction ear cup pivots to provide long flight wearing comfort.
Models Covered
Model Number Description
AIRMAN8P-0210 DOUBLE SIDE ANR HEADSET 2PJ 600 OHM
AIRMAN8P-0211 DOUBLE SIDE ANR HEADSET XLR5 600 OHM
Tab.3.1: AIRMAN 8+ Models and Connector/Wiring

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Reference View
1
23
4
5
67
8
1. Headband Pad
2. Headband Pad Holder
3. Headset Gliders
4. Ear Cushions
5. Boom Rotator
6. Windscreen / Microphone
7. Cord with Strain Relief
8. Boom

8en | Parts list and exploded view AIRMAN8+
2020-07 | 01 | F.01U.387.060 Customer Maintenance Manual Bosch Security Systems, LLC
4 Parts list and exploded view
4.1 Parts list
Item CTN SPR
ACC
Part No. Description Model
-0210 -0211
1 a,b AIRMAN8P- 0909 SPR F.01U.382.338 CARRYING CASE 1 1
2 b AIRMAN7-0900 ACC F.01U.313.415 WINDSCREEN (2PCS) 1 1
S-F01U327249 SPR F.01U.327.249 WINDSCREEN (SINGLE)
3 b AIRMAN8P-0908 ACC F.01U.382.336 HEAD PAD 1 1
ESP-F01U360393 SPR F.01U.383.827
4 a,b AIRMAN8P-0910 ACC F.01U.382.339 SANITARY COVER, AIRMAN
8+ (10PCS)
1 1
ESP-F01U379003 SPR F.01U.383.830 SPP SANITARY COVER,
AIRMAN 8+ (2PCS)
5 b AIRMAN8P-0903 ACC F.01U.382.337 EAR CUSHION, AIRMAN 8+
(2PCS)
1 1
ESP-F01U347235 SPR F.01U.383.825 SPP Ear cushion Airman 8+
(2pcs)
6 a,b AIRMAN7-0904 ACC F.01U.313.419 CLOTHING CLIP 1 1
S-F01U342113 SPR F.01U.342.113
7 b,c AIRMAN7.0908 ACC F.01U.344.857 MIC PREFILTER 1 1
S-F01U346184 SPR F.01U.346.184
8 S-F01U109816 SPR F.01U.109.816 SCREW, PT, PAN HEAD, K15
X 6MM, BLK ZINC
6 6
9 a S-F01U150106 SPR F.01U.150.106 WIRE 28 AWG 212 WHITE 2 2
10 a S-F01U150110 SPR F.01U.150.110 WIRE 28 AWG RED 2 2
11 S-F01U342083 SPR F.01U.342.083 CORD UNIT, PJ Y-BLOCK 1 0
12 S- F01U342084 SPR F.01U.342.084 EAR SHELL, BOOM SIDE,
AIRMAN 8
1 1
13 S-F01U342085 SPR F.01U.342.085 EAR SHELL, NON BOOM
SIDE, AIRMAN 8
1 1
14 S-F01U342086 SPR F.01U.342.086 COVER, NON BOOM SIDE,
AIRMAN 8
1 1
15 S-F01U342087 SPR F.01U.342.087 SWITCH ACTUATOR, AIRMAN
8
1 1
16 S-F01U342088 SPR F.01U.342.088 GLIDER STOP (2PCS) 1 1
17 S-F01U342090 SPR F.01U.342.090 HEADBAND COVER 1 1

AIRMAN8+ Parts list and exploded view | en 9
Bosch Security Systems, LLC Customer Maintenance Manual 2020-07 | 01 | F.01U.387.060
Item CTN SPR
ACC
Part No. Description Model
-0210 -0211
18 ESP-F01U380743 SPR F.01U.383.834 PCBA, NON BOOM SIDE,
AIRMAN 8+
1 1
19 ESP-F01U380742 SPR F.01U.383.833 PCBA, BOOM SIDE, AIRMAN
8+
1 1
20 S-F01U342097 SPR F.01U.342.097 LABEL, TELEX 1 1
21 ESP-F01U384604 SPR F.01U.383.824 CORD UNIT, XLR, 5M 0 1
22 d ESP-F01U379469 SPR F.01U.389.975 SPEAKER ASSY, AIRMAN 8+
(including faceplate and seal)
2 2
23 S-F01U344918 SPR F.01U.344.918 OVER HEAD CABLE 1 1
24 S-F01U344922 SPR F.01U.344.922 BOOM MIC ASSY, AIRMAN 8 1 1
25 ESP-F01U360396 SPR F.01U383.835 GLIDER YOKE ASSY, AIRMAN
8+
2 2
26 S-F01U344924 SPR F.01U.344.924 SCREW, PT PAN HEAD K15 X
3.5MM (25PCS)
4 4
27 ESP-F01U378961 SPR F.01U.389.974 SPP Headpad holder Airman
8+ (with Velcro
1 1
28 a ESP-F01U359353 SPR F.01U.383.826 AIRMAN 8+ VELCRO HOOK,
ADHESIVE BACK
1 1
29 a S-F01U359827 SPR F.01U.359.827 AIRMAN REFRESH, Headband
Pad Holder
1 1
30 AIRMAN7.0906 ACC F.01U.313.421 AIRMAN REFRESH, Headband
Pad
1 1
a.Not shown.
b.Either part number is acceptable.
c.Acoustic cloth is included as part of this item.
d.The speaker assembly includes the speaker and the faceplate.

10 en | Parts list and exploded view AIRMAN8+
2020-07 | 01 | F.01U.387.060 Customer Maintenance Manual Bosch Security Systems, LLC
4.2 Exploded view
21
11
2
7
24
15
19
26
25
16
29, 30
23
17
27, 28 3
5
22 8
12
20 14
18
26
13
8
22
5
16
25

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Bosch Security Systems, LLC Customer Maintenance Manual 2020-07 | 01 | F.01U.387.060
5 Maintenance
The Airman 8+ headset is designed so that ANR performance and boom microphone sensitivity
can be adjusted as required to meet specification requirements. These headset adjustments
are made in order to alter performance. All other maintenance requires replacement of parts,
fixing open wires, or removing shorted wires. See specification instructions for ANR or boom
microphone adjustment.
5.1 Recommended maintenance schedule
Notice!
Ear cushions, headband pads, and microphone windscreens are wear items. For proper
headset performance, inspect and replace these items at regular intervals. See the
maintenance schedule for more information. Failure to replace items when deterioration or
damage is apparent diminishes headset performance.
Task Per Use Monthly 6 months
Check boom mic placement X
Check ear cup placement X
Check headband fit X
Inspect and clean connectors X
Clean ear cushions X
Clean headband pad X
Check connection cable X
Inspect and replace windscreen X
Inspect and replace ear cushions X
Inspect and replace headband pad X

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2020-07 | 01 | F.01U.387.060 Customer Maintenance Manual Bosch Security Systems, LLC
5.2 Basic inspection
Speaker not workingMic not working ANR not working
Basic Inspection
Physical Inspection
Mic
Mic Mic
Speaker
Speaker
Speaker
ANR
ANRANR
Mic
Speaker
ANR
Did Talk Test Pass?
Did it pass?Reeinstall in Aircraft
What didn´t pass?
Perform Talk Test
Perform Talk Test
Passed
Talk Test Passed,
Minimal check
No
Did not pass
5.2.1 Physical inspection
Review all plastic parts for cracks or breaks
To review plastic parts, do the following:
– Note any parts which need to be replaced
Review all cables for obvious signs of damage to the insulating materials
To review cables, do the following:
– Look for any cables that have been pulled out of the housings.
– Look for any cables with unnatural or unusual bends or breaks.
– Note any cable assemblies that need to be replaced.
Review user replaceable items
To review user replaceable items, do the following:
– Check ear cushions.
– Check headband pads.
– Check microphone windscreen.
– Check clothing clips.
– Note any replaceable items that need to be replaced. Talk test.

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Test
When performing a talk test, things to be aware of:
– Note any unusual or unexpected noises, static, and oscillations.
– Note any distorted audio.
– Turn ANR on and note noise reduction of fans, ambient noise etc.
– Turn ANR off and note noise levels return to normal.
– Verify sound is heard in both ears.
5.3 Microphone troubleshooting
Mic
*ANR is OFF
Does Mic Pass
theTalk Test
Validate continuity
from plug to PCBA
Replace Cord
Visual Inspection
of all internal wires
Is there power
to the PCBA
Are wires
damaged
Replace the
broken wires
Power On
ANR
Test
Sensitivity
See ANR
Troubleshooting
But, the microphone
doesn´t work
Validate Mic
PCBA
Is Mic circuitry
validated
Replace Microphone
Assembly
Does ANR
work
Microphone Test
Complete
Adjust Microphone
Sensitivity
Validate Power
Source Yes
No
No No
No
No
Yes
Yes Yes
Yes
No
No
Yes
Replace
PCBA
Does the Mic
Meet Sensitivity
Specification
5.3.1 Validate continuity from plug to PCBA
To validate continuity from the plug to the PCBA, do the following:
1. Using an Ohmmeter, place one probe on the ring terminal of the plug.
2. Place the other probe at J1 on the PCBA.
3. Record the measurement.
4. Using an Ohmmeter, place one probe on the sleeve terminal of the plug.
5. Place the other probe at J2 on the PCBA.
6. Record the measurement.
If the reading is approximately zero, continuity is good.
If any other reading is seen, the continuity is bad. Replace the cable.

14 en | Maintenance AIRMAN8+
2020-07 | 01 | F.01U.387.060 Customer Maintenance Manual Bosch Security Systems, LLC
5.3.2 Validate mic circuitry
To validate the mic PCBA, do the following:
1. Construct a test circuit.
2. Connect the test circuit to the microphone plug of the headset.
For more information, see Connectors.
3. Test for an audio signal.
If audio signal is detected, the board is valid.
If audio signal is not detected, the board should be replaced.
5.3.3 Microphone/amplifier sensitivity test
Notice!
This headset was designed, tested, and approved to FAA TSO C139a. The TSO requires the
headset meet the minimum performance specifications as defined in RTCA DO-214a. This
document and specifications listed here reference the test procedures and equipment used
as defined in these standards. Refer to the standard for details on how to perform individual
tests.
To test sensitivity of the microphone, do the following:
1. Calibrate an artificial mouth.
2. Using the test circuit from the mic validation and TSO procedures, measure the output of
the headset microphone with a true RMS AC voltmeter.
5.3.4 Microphone sensitivity adjustment
The microphone gain has been factory-adjusted to the nominal level required for normal radio
operation. Microphone sensitivity adjusts by turning the gain adjustment control.
To adjust the microphone, do the following:
1. Rotate the boom mic clockwise until the microphone gain adjustment access hole is
aligned and open.
2. Insert a 2mm x 0.5mm flat-bladed screwdriver into the gain adjustment access hole.
Notice!
If the gain adjustment access hole is properly aligned, the screwdriver can be inserted
approximately ½-inch into the hole. If not properly aligned, the screwdriver only inserts
approximately 1/8-inch into the hole.
3. Turn the gain adjustment potentiometer clockwise to increase the gain.
OR
Turn the gain adjustment potentiometer counterclockwise to decrease the gain.

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5.4 Speaker troubleshooting
Speakers- Airman 8
Do the Speakers
Pass the Talk Test
Are the speaker
wires in good
condition?
Are the solder
points in good
condition?
Did failure occor
in both speakers?
Which Speaker
Faled?
Is the resistance
good?
Did the
PCBA Pass?
Is the overhead
cable in good
condition?
Are the speaker
wires in good
condition?
Are the solder
points in good
condition?
Is the resistance
good?
Did the
PCBA Pass?
Is the PCBA
working?
Is the main
cable in good
condition?
Did Both
Speakers Pass
Sensitivity?
Are the solder
points in good
condition?
Is the continuity
good?
Do the speakers
work?
Speaker Test
Complete
If 600 Ohm unit, the speakers are
wired in series, meaning when
one speaker fails, both fail.
Resistance verification on both
speakers must be done.
Did it Pass?
Physically inspect
the overhead cable
Physically inspect
speaker wires
Resolder the
speaker wires
Replace the
Speaker
Replace the
PCBA
Measure Resistence
of Speaker
Test the PCBA
Replace the
Boom side
Speaker Wires
Resolder the
speaker wires
Replace the
Speaker
Replace the
PCBA
Test Sensitivity
Replace the
Boom side
Speaker Wires
Check the solder
points at the speaker
and at the board
Physically inspect
speaker wires
Replace the
cable
Measure Resistence
of Speaker
Test the PCBA
Check the solder
points at the speaker
and at the board
Physically inspect
the main cable
Test the boom
side PCBA
Replace the
PCBA
Replace the
Cable
Validate the
PCBA
Replace the
speakers
Replace the
PCBA
Resolder the
main cable to
the PCBA
Check Solder Points
on Boom Side PCBA
Replace the
main cable
Measure continuity
from plug to PCBA
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Non-Boom SideBoom Side
No
No
5.4.1 Speaker sensitivity and frequency response verification
Notice!
This headset was designed, tested, and approved to FAA TSO C139a. The TSO requires the
headset meet the minimum performance specifications as defined in RTCA DO-214a. This
document and specifications listed here reference the test procedures and equipment used
as defined in these standards. Refer to the standard for details on how to perform individual
tests.
All models tested, unless noted otherwise.
Transducer Type: Dynamic
Transducer: 600Ω
Impedance (at the earphone plug): Must meet standards outlined in the
specifications table in either the technical
manual or the technical data sheet.
Sensitivity:
Frequency Response:

16 en | Maintenance AIRMAN8+
2020-07 | 01 | F.01U.387.060 Customer Maintenance Manual Bosch Security Systems, LLC
5.4.2 Measure the resistance (plug to PCBA)
To measure the resistance, do the following:
1. Using an ohmmeter, place one probe on J5.
2. Place the other probe on J6 or J17.
If measured at 300Ω ±20%, continuity is good.
If measured at 600Ω, one of the speaker paths is defective.
If measured at 270Ω or less, there is a short in the speaker path.
5.4.3 Validate the boom side PCBA
To validate the boom side PCBA, do the following:
1. On the boom side PCBA, send a 1kHz sine wave, 1Vrms signal from J5 to J6.
2. Verify the ANR switch is in the off position.
3. Using an oscilloscope, place a probe at J13.
4. Place the other probe at J14.
If a signal is found, the board is good and if no sound is heard from the speaker, the
speaker or wiring is bad. Determine if the speaker needs to be replaced or the wires nee
re-soldering.
If a signal is not found, the board is not good and should be replaced.
5.4.4 Validate the non-boom side PCBA
To validate the non-boom side PCBA, do the following:
1. On the non-boom side PCBA, send a 1kHz sine wave, 1Vrms signal from J5 to J6.
2. Verify the ANR switch is in the off position.
3. Using an oscilloscope, place a probe at J13.
4. Place the other probe at J14.
If a signal is found, the board is good and if no sound is heard from the speaker, the
speaker or wiring is bad. Determine if the speaker needs to be replaced or the wires nee
re-soldering.
If a signal is not found, the board is not good and should be replaced.

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5.5 ANR troubleshooting
ANR
Troublehoot Speaker
Troubleshoot Mic
Troublehoot Speaker
Troubleshoot Mic
Turn the power and
ANR on
Replace main PCBA
Measure Voltage on
J11 & J12
Measure Voltage on
J11 & J12
Verify continuity of
Overhead Wire
Adjust the ANR
Adjust the ANR
Adjust the ANR
Replace/Resolder
speaker
Replace
Boomside PCBA
Validate Speaker
Connections
Replace
Non-boomside PCBA
Replace
Non-boomside PCBA
No
No
No
No
No
No
No
No
No No
Does audio pass
with no power?
Does ANR work?
No ANR on the headset
No, boomside
ANR doesn´t work
Does ANR work?
Does ANR work?
Does ANR work?
Are the
speakers good?
Is the voltage good?
Is the voltage good?
Is the voltage good?
Is Continuity Good?
Does ANR pass
the Talk Test? Final Talk Test
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No, non-boomside
ANR doesn´t work
Measure Voltage on
J11 & J12
Adjust the ANR
Replace
Overhead Wire

18 en | Maintenance AIRMAN8+
2020-07 | 01 | F.01U.387.060 Customer Maintenance Manual Bosch Security Systems, LLC
5.5.1 Measuring ANR circuit voltages and switch function
Notice!
This headset was designed, tested, and approved to FAA TSO C139a. The TSO requires the
headset meet the minimum performance specifications as defined in RTCA DO-214a. This
document and specifications listed here reference the test procedures and equipment used
as defined in these standards. Refer to the standard for details on how to perform individual
tests.
Notice!
Minimum attenuation requirements are not requirements of FAA TSO. To achieve the
minimum attenuation, Bosch approved test system is required.
To measure voltage and switch function on the boom side, do the following:
1. Verify the headset main cable plugs are on.
2. Using a voltage meter, place the ground probe at J10.
3. Place the positive probe on TP14.
If the measurement is 3.3Vdc, the power regulator is good. If the measurement is
anything other than 3.3Vdc ±10%, the power regulator is bad. Replace the board.
To measure the switch functionality on the boom side, do the following:
1. If the regulator is good, verify the ANR switch is in the off position.
2. Place the positive probe at J11.
If the measurement is near zero, the switch is open.
3. Move the ANR switch to the on position.
If the measurement is at 3.3Vdc ±10%, the switch is good. If the measurement is anything
else, the switch is bad. Replace the board.
To measure the fail-safe control logic for ANR, do the following:
1. Verify the ANR switch is in the on position.
2. Place the voltage meter probe at J12 on the boom-side.
If the measurement is greater than -6Vdc, the fail-safe logic is working properly. If the
measurement is anything below -6Vdc, the fail-safe logic is not working. Replace the
board.
To measure voltage and switch function on the non-boom side, do the following:
1. If the boom side is good, place the positive probe at J11 on the non-boom side.
If the measurement is near 0, the switch is open
2. Move the ANR switch to the on position.
If the measurement is at 3.3Vdc ±10%, the switch is good. If the measurement is anything
else, the switch is bad. Replace the board.
To measure the fail-safe control logic for ANR, do the following:
1. Verify the ANR switch is in the on position.
2. Place the voltage meter probe at J12 on the non-boom-side.
If the measurement is greater than -6Vdc, the fail-safe logic is working properly. If the
measurement is anything below -6Vdc, the fail-safe logic is not working. Replace the
board.
Notice!
For board replacement, contact Bosch ASA or a Bosch certified facility for replacement and
adjustment.

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5.6 Cleaning the headset and connectors
!
Caution!
Do not allow alcohol or any liquid to touch the speaker or microphone element directly.
To clean the headset, do the following:
4Using a mild detergent with water and a soft towel, or isopropyl alcohol wipes, clean the
plastic and metal headset parts.
!
Caution!
Do not soak or allow liquid to puddle on the unit.
5.7 Cleaning the ear cushions and headband pads
!
Caution!
Do not soak the cushions or pads.
To clean the ear cushions and headband pad, do the following:
4Using a damp (not wet) soft towel or isopropyl alcohol wipe, gently wipe the ear
cushions and headband pad thoroughly.
5.8 Replacing ear cushions and headband pads
To ensure optimal product performance, it is recommended you replace ear cushions and
headband pads periodically (every six months, or sooner if needed). See Recommended
maintenance schedule, page 11 .
For detailed instructions on replacing the ear cushions, refer to Ear cushion replacement, page
21 .
For detailed instructions on replacing the headband pads, refer to Headband pad and
headband pad replacement, page 22 .
5.9 Installing and replacing the hygenic covers
Notice!
Two hygienic covers are included with the headset. However, extra hygienic covers can be
purchased separately.
To replace the hygienic covers, do the following:
1. Grasp the edge of the hygienic cover where it folds into the slot on the ear cup.
2. Gently pull the hygienic cover up and away from the ear cup.
3. Starting at the top of the ear cup, carefully work the cover around the ear cup until it is in
place.

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5.10 Replacing the windscreen
The foam windscreen can be cleaned using low-pressure air to blow contaminates off the
exterior. If low-pressure air does not provide effective results, the windscreen should be
replaced.
!
Caution!
Do not use any liquid on the foam windscreen.
To remove the windscreen, do the following:
4Grasp the microphone windscreen and gently pull away from the microphone.
To replace the windscreen, do the following:
4Slide the new windscreen over the microphone.
5.11 Headset storage
To store the headset, do the following:
1. Move the boom mic above the headband.
2. Coil the cord into a loop.
3. Place the coiled cord and headset in the carrying case.