Clear-Com HB-704 User Manual

CLEAR-COM ENCORE

HB-702 TWO-CHANNEL HEADSET STATION

HB-704 FOUR-CHANNEL HEADSET STATION

INSTRUCTION MANUAL

HB-702/HB-704 Two- & Four-Channel Headset Stations Instruction Manual

Copyright© 2013 ΗΜΕClear-Com Ltd

All Rights Reserved

Part Number: 810351Z Rev. 3

Legal Disclaimer

Clear-Com, the Clear-Com logo, and Clear-Com Concert are trademarks or registered trademarks of HM Electronics, Inc.
The software described in this document is furnished under a license agreement and may be used only in accordance with the
terms of the agreement.

The product described in this document is distributed under licenses restricting its use, copying, distribution, and decompilation/
reverse engineering. No part of this document may be reproduced in any form by any means without prior written authorization
of Clear-Com, an HME Company.
www.clearcom.com

Clear-Com Contacts

Americas and Asia-Pacific Headquarters

California, United States
Tel: [phone]
Email: [e-mail]

Europe, Middle East, and Africa Headquarters

Cambridge, United Kingdom
Tel: [phone]
Email: [e-mail]

Canada Office

Quebec , Canada
Tel: [phone]

China Office

Beijing Representative Office
Beijing, P.R.China
Tel: [phone]

Clear-Com Offices are located in California, USA; Cambridge, UK; Montreal, Canada; and Beijing, China. Specific addresses
and contact information can be found on Clear-Com's corporate website:

CONTENTS

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Internal Adjustments and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Block Diagram of HB-702 Two-Channel Headset Station . . . . . . . . . . . . . 3-1

Block Diagram of HB-704 Four-Channel Headset Station . . . . . . . . . . . . . 3-2

Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . 4-1

HB-702/HB-704 Two- and Four Channel Headset Stations . . . . . . . . . . . . 4-1

LIMITED WARRANTY. . . . . . . . . . . . . . . . . . . . . . . . . . 5-I

Warranty Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-i

Technical Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-i

Warranty Repairs and Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-ii

Non-Warranty Repairs and Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii

Extended Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-ii

Service Contract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-iii

Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-iii

HB-702/HB-704 TWO- AND FOUR-CHANNEL HEAD-

i

ii

HB-702/HB-704 TWO- AND FOUR-CHANNEL HEAD-

Please read and follow

these instructions before

operating this product.

IMPORTANT SAFETY
INSTRUCTIONS

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with dry cloth.

7. Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.

8. Do not install near any heat sources such as radiators, heat registers,
stoves, or other apparatus (including amplifiers) that produce heat.

9. Only use attachments/accessories specified by the manufacturer.

10. Use only with the cart, stand, tripod, bracket, or table specified by the
manufacturer, or sold with the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to avoid injury from
tip-over.

11. Unplug this apparatus during lightning storms or when unused for long
periods of time.

12. Refer all servicing to qualified service personnel. Servicing is required
when the apparatus has been damaged in any way, such as power-supply
cord or plug is damaged, liquid has been spilled or objects have fallen into
the apparatus, the apparatus has been exposed to rain or moisture, does
not operate normally, or has been dropped.

13. WARNING: To reduce the risk of fire or electric shock, do not expose
this product to rain or moisture.

Please familiarize yourself with the safety symbols in Figure 1. When you
see these symbols on this product, they warn you of the potential danger
of electric shock if the station is used improperly. They also refer you to
important operating and maintenance instructions in the manual.

HB-702/HB-704 TWO- AND FOUR CHANNEL HEAD-

iii

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

This symbol alerts you to the presence of uninsulated dangerous
voltage within the product's enclosure that might be of sufficient
magnitude to constitute a risk of electric shock. Do not open
the product's case.

This symbol informs you that important operating and main­tenance instructions are included in the literature accompanying
this product.

Figure 1: Safety Symbols

EMC AND SAFETY

The HB-702 and HB-704 stations meet all relevant CE and FCC
specifications set out below:

EN55103-1 Electromagnetic compatibility. Product family standard for
audio, video, audio-visual, and entertainment lighting control apparatus
for professional use. Part 1: Emissions.

EN55103-2 Electromagnetic compatibility. Product family standard for
audio, video, audio-visual, and entertainment lighting control apparatus
for professional use. Part 2: Immunity.

And thereby compliance with the requirement of Electromagnetic
Compatibility Directive 2004/108/EC and Low Voltage Directive
2006/95/EC

This device complies with Part 15 of the FCC Rules. Operation is subject
to the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.

iv

HB-702/HB-704 TWO- AND FOUR CHANNEL HEADSET

OPERATION

INTRODUCTION

Congratulations on choosing this Clear-Com product. Clear-Com was
established in 1968 and remains the market leader in providing intercoms for
entertainment, educational, broadcast and industrial applications. The
ruggedness and high build-quality of Clear-Com products defines the industry
standard. In fact, many of our original beltpacks and main stations are still in
daily use around the world.

The HB-702 two-channel and HB-704 four-channel headset stations are
powerful, yet user-friendly units that can serve as versatile intercom stations.
Please read this manual completely to better understand the functions of these
products. If you encounter a situation or have a question that this manual does
not address, contact your dealer or call Clear-Com directly at the factory. Our
applications support and service people are standing by to assist you. (Refer to
Chapter 5: “Warranty” for contact information.) Thank you for selecting
Clear-Com for your communications needs.

DESCRIPTION

The Clear-Com HB-702 and HB-704 headset stations are ideal for use in
theatres, live performances, industrial environments, and small television
facilities. They feature speech intelligibility in all noise levels and can be
customized through their programmable options.

Selectable, multi-channel talking and/or listening allows the operator to
communicate on one of two (HB-702) or four (HB-704) intercom channels.
The dual-action talk button operates in electronic momentary or latching
mode. The HB-702 and HB-704 offer visual call signaling to attract the
attention of operators. The remote mic kill (RMK) feature on main stations
will turn off any open microphones on these headset stations.

The HB-702 and HB-704 stations accept dynamic headsets, such as the
Clear-Com or the HS-6 telephone headset series. A sidetone control allows
the operator to vary the level of his voice as heard in the headset.

The HB-702 and HB-704 receive power from the Clear-Com intercom line.
They mount in a standard two-gang electrical outlet box.

The extra-thick front panel and compact, surface-mount circuitry results in a
smaller-sized and lighter-weight package that maintains Clear-Com
ruggedness. The intercom channels connect to a plug-on screw-terminal strip.

The optional EB7-TW daughter board module can be installed to provide an
interface to two intercom channels on a single microphone cable. Also, the
EB7-4W four-wire daughter board module is available to allow long-distance
connections using separate pairs of wire for send audio and receive audio. The

HB-702/HB-704 TWO- AND FOUR-CHANNEL HEAD-

1-1

EB7-4W four-wire option supports two-channel operation and may only be

B

A

2

1

4

C

D

3 5

6

Volume

Sidetone

Headset

Call

Talk

Channel Select

Headset

Remote Station

HB-704

used on the HB-702.

The HB-702 and HB-704 are compatible with all Clear-Com party-line
intercoms.

OPERATION

Normal operation of the HB-702 or HB-704 headset station requires only the
front-panel controls. The controls located elsewhere on the unit are intended
to be set-and-forget in nature. For intercom operation, set the volume control
to the desired level and press the talk button when talking. Set the sidetone
control for the desired amount of sidetone in the earphone.

FRONT PANEL

The controls, indicators, and connectors found on the HB-704 front panel are
shown in Figure 1-1 and are described by the following text. The HB-702
front panel is identical except the channel switch has two positions.

Figure 1-1 HB-704 Front Panel

1. Talk button and light: The talk button activates the microphone feed to
the selected intercom channel. The talk button has a dual action
(momentary or latching) depending upon how the button is pressed. If
desired, the latching function can be defeated using an internal switch.
The following describes the various functions of this button.

• MOMENTARY: Press and hold the talk button while speaking.

Release it when finished.

1-2

HB-702/HB-704 TWO- AND FOUR-CHANNEL HEADSET