Telex AIRMAN8+ Series, Customer Maintenance Manual

Page: 3 / 42

Table of contents | en 3
Bosch Security Systems, LLC Customer Maintenance Manual 2020-07 | 01 | F.01U.387.060
Table of contents
1
Record of revisions 4
2 Purpose of manual 5
2.1 Technical support 5
2.2 Parts ordering 5
2.3 Repairs 5
2.4 Safety precautions 5
3 Introduction 6
4
Parts list and exploded view 8
4.1 Parts list 8
4.2 Exploded view 10
5 Maintenance 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
6 Disassembly 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
7 Assembly 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
8 Wiring Diagrams and Connectors 37