Clear-Com CS-702 User Manual

CLEAR-COM ENCORE

CS-702 TWO-CHANNEL MAIN STATION

INSTRUCTION MANUAL

-i

CS-702 Portable Two-Channel Main Station Instruction Manual

Part number: 810344Z Rev. 3

Legal Disclaimers

Copyright © 2013 HME Clear-Com Ltd.

All rights reserved.

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.

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:

www.clearcom.com

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]

-ii

CONTENTS

Legal Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-ii

Americas and Asia-Pacific Headquarters. . . . . . . . . . . . . . . . . . . . . . . 1-ii

Europe, Middle East, and Africa Headquarters . . . . . . . . . . . . . . . . . . 1-ii

Canada Office. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-ii

China Office . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-ii

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

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

The Clear-Com Concept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Monitoring System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Dual-Action Talk Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Stage Announce (Paging). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Call Signaling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Program Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Sidetone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Linking Channels Together . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Remote Mic-Kill Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Power Supply Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

System Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Portability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Easy Interconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Easy System Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Front Panel Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Rear Panel Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

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

Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Clear-Com Station Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

System Powering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Cable Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Portable Installation Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Permanent Installation Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Internal Options and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Interconnection Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Headsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

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

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

CS-702 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

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

CS-702 TWO-CHANNEL MAIN

i

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

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

CS-702 Two-Channel Station. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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-iii

Extended Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-iii

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

ii

CS-702 TWO-CHANNEL MAIN STATION

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. Do not defeat the safety purpose of the polarized or grounding-type plug.
A polarized plug has two blades, with one wider than the other. A
grounding-type plug has two blades and a third grounding prong. The
wide blade or the third prong are provided for your safety. If the provided
plug does not fit into your outlet, consult an electrician for replacement of
the obsolete outlet.

10. Protect the power cord from being walked on or pinched particularly at
plugs, convenience receptacles, and the point where they exit from the
apparatus.

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

12. 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.

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

14. 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.

15. 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 main station is used improperly. They also refer
you to important operating and maintenance instructions in the manual.

CS-702 TWO-CHANNEL MAIN STATION

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 CS-702 Two-Channel Main Station meets all relevant CE, FCC, UL,
and CSA 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.

UL 60065-7, CAN/CSA-C22.2 No.60065-3, IEC 60065-7 Safety
requirements.

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

CS-702 TWO-CHANNEL MAIN STATION

Clear-Com is a

closed-circuit intercom

system that consistently

provides high-clarity

communication in both

high-noise and low-noise

environments.

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, 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.

Please read this manual completely to better understand the functions of this
product. 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.

THE CLEAR-COM CONCEPT

Clear-Com is a closed-circuit intercom system that consistently provides
high-clarity communication in both high-noise and low-noise environments.
A basic system consists of a single- or multi-channel power supply or main
station connected to various single- or multi-channel remote stations, such as
beltpacks and loudspeaker stations.

Clear-Com manufactures a wide variety of both portable and
fixed-installation units. All are compatible with each other. Clear-Com
intercom systems can also interface with other communication systems and
devices.

Clear-Com stations are interconnected with two-conductor, shielded
microphone cable, using 3-pin XLR connectors. One wire carries the DC
power from a main station or power supply to all remote stations, and the
other wire carries two-way (duplex) audio information. The shield acts as a
common ground. One termination (per channel) is needed throughout the
intercom network, and is usually located in the main station or power supply.

Clear-Com is a distributed amplifier system; each main and remote station
houses its own mic preamplifier, headset or speaker power amplifier, and
signaling circuitry. The automated headset detection circuit shuts off a
station’s mic pre-amp when the headset is disconnected, so background noise
on the line is not increased by an unused yet online station. Low-impedance
mic input lines and specially designed circuitry make Clear-Com channels
virtually immune to RFI and dimmer noise.

Clear-Com main stations, power supplies and certain remote stations each
have an auxiliary program input with its own volume control, which allows an
external audio source to be fed to the intercom system.

CS-702 TWO-CHANNEL MAIN STATION

1-1

Headset

CS-702

2-Channel

Main Station

Call

Remote

Mic Kill

Sidetone

B

Prgm
Feed
Level

Program
Volume

D.C. Short

Intrpt

Pgm

Sidetone

A

Prgm
Feed
Level

Intrpt

Pgm

Announce

Earphone

Party LIne

Link

Volume

Tal k

Ch. A

Ch. B

Channel A Channel B

Off

Off

The power provided by

main stations and power

supply units enable remote

stations to operate with

minimal current while

generating extremely loud

listen volumes.

Visual signal circuitry (call lights), a standard feature on all main and remote
stations, allows you to attract the attention of operators who have removed
their headsets.

Depending upon the type of main and remote stations selected and assuming
that enough DC power is available remote stations and headset stations can be
distributed along 1 mi. (1.67 km) of wire. Remote stations bridge the intercom
line at a very high impedance and place a minimum load on the line. The
audio level always remains constant and does not fluctuate as stations leave
and join the network.

The DC power provided by main stations and power supply units enable
remote stations to operate with minimal current while generating extremely
loud listen volumes. The higher voltage and low current keep voltage losses to
an absolute minimum in long lines.

DESCRIPTION

The CS-702 is a portable, two-channel main station with a regulated power
supply and a versatile monitoring system. It features excellent speech
intelligibility in all noise-levels. The CS-702 contains a mic preamp with a
limiter.

The CS-702 provides DC voltage and the ability to talk and listen on two
separate channels. It supports and monitors two intercom lines containing
remote headset or remote speaker stations.

1-2

Figure 1-1 CS-702 Front Panel

Relay Out

Program Input

30V, 1.2A Continuous, 2A Peak

A

Channel

B

Channel

On

Off

Ter m

On

Off

Figure 1-2 CS-702 Rear Panel

CS-702 TWO-CHANNEL MAIN STATION

Mic

Line

MONITORING SYSTEM

The front panel of the CS-702 has one headset connector for use by the
operator. The operator monitors the intercom channels by turning up the
appropriate listen level volume controls (one for channel A, one for channel
B). Either channel may be monitored separately, or both simultaneously
(without tying the two channels together). These volume controls are always
active regardless of talk channel selection on the station.

The jack marked earphone is connected in parallel with the earphone circuit
of the headset connector. It can be used for monitoring or recording.

DUAL-ACTION TALK BUTTONS

Each channel has its own talk button which can either latch on, or operate
momentarily. Pressing the button quickly will toggle the talk function,
alternately turning it on or off. The talk button will illuminate amber when
activated and blue when not activated.

STAGE ANNOUNCE (PAGING)

The stage announce button on the front panel sends the signal from the
operator’s headset microphone to the balanced, line-level stage announce
output on the back panel.

The stage announce button also mutes the operator’s voice output to the
intercom channels. This mute function can be defeated with an internal
user-selectable jumper. The stage announce button also activates a SPDT
relay when pressed. The 1 ampere contacts can be used for any user-desired
control function (i.e. muting a local monitor speaker).

CALL SIGNALING

Visual “call signaling” attracts the attention of people who have removed their
headsets or turned off their speakers. The CS-702 front panel provides a call
button for each channel. Pressing the call button turns on the call lights at all
stations on that channel. The call is active regardless of talk status.

When a remote station sends a call signal, the call button associated with that
channel flashes red, whether or not the channel is selected.

PROGRAM INPUT

The CS-702 accepts a balanced, mic-level or line-level program input which
can be monitored in the headset. Program volume for the operator’s headset is
adjustable with the program volume knob on the front panel. The external
program is also assignable and adjustable in level to either or both channels,
and mixes with the intercom signal. The program feed can be set to be
interrupted by the talk for a particular channel.

CS-702 TWO-CHANNEL MAIN STATION

1-3

SIDETONE

The sidetone controls for each channel on the front panel allows adjustment of
the operator’s own voice as heard in the headset.

LINKING CHANNELS TOGETHER

A front panel button is provided. It allows the operator to instantly connect
channel A and channel B together for a combined intercom system consisting
of both channels.

REMOTE MIC-KILL FUNCTION

The CS-702 provides the ability to turn off any open mics on remote stations.
Momentarily pressing the RMK button will remove the DC power from both
channels clearing the talk function of all the beltpacks.

POWER SUPPLY PROTECTION

The CS-702 power supply is regulated, current-limited, and provides DC
power from an AC mains supply. The CS-702 has an automatic short-circuit
sensor to protect the system from miswired cable, shorts in the lines, or
general current overload. If a short occurs, the red LED on the front panel
marked D.C. Short illuminates. Removing the short will cause the power
supply to reset itself automatically in as little as ½ second, depending upon
whether there was a single or multiple short or overload.

SYSTEM TERMINATION

The CS-702 provides individually-selectable audio termination networks for
both channel A and channel B.

PORTABILITY

The unit is lightweight and sturdy for applications that require that it be
moved between various locations.

EASY INTERCONNECTION

The CS-702 provides three 3-pin, male XLR outputs for channel A
(connectors are wired in parallel) and three for channel B. Intercom signals
are fed from the CS-702 with standard mic cable (see next section).

1-4

EASY SYSTEM EXPANSION

The CS-702 can be connected together with other CS-702s or other
Clear-Com power supplies for multiple two-channel systems and back-up
power support.

CS-702 TWO-CHANNEL MAIN STATION

FRONT PANEL DESCRIPTION

Normal operation of the CS-702 only requires access to the front panel
controls. For intercom operation set the listen level controls for each channel
to desired level and press the talk switches when talking. The rest of this
section is a detailed description of each control.

12

10

4

Sidetone

A

Channel A

2

Headset

8

9

Earphone

Announce

Pgm

Party LIne

Link

Intrpt

Prgm
Feed
Level

6

7

3

Volu me

Talk

Call

1

Channel B

2

Sidetone

B

5

Remote

Mic Kill

4

Prgm
Feed
Level

Pgm

Intrpt

OffOff

Program
Volume

Ch. A

Ch. B

D.C. Short

CS-702

2-Channel

Main Station

67

11

13

Figure 1-3 CS-702 Front Panel

1. Talk Buttons: Each channel has its own illuminated talk button for
activating the microphone feed to a given channel. Mechanically the
pushbutton is momentary in action; however, electrically the button has
dual action (momentary or latching) depending on how the button is
pressed.

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

Release it when finished.

• LATCHING: Press and release the button quickly to latch the talk

function. Press and release the button again to turn off the talk
function.

• TALK INDICATION: The talk button illuminates amber when you

press it to send a talk signal, and blue when not active. When
illuminated blue, the talk button indicates that the station is receiving
power.

• CALL INDICATION: The call button will flash red when a call

signal is received on the channel.

2. Call Buttons: Each channel has its own call button. Pressing the call
button at any time will send a call signal on that channel regardless of the
activation of the talk circuit for that channel.

The call button for that channel illuminates brighly when pressed, indicat­ing the presence of a call signal on the line.

3. Listen Level Controls: Each channel has a separate listen level control.
Listening is always on and is not controlled by any logic. To listen to a

CS-702 TWO-CHANNEL MAIN STATION

1-5