Telex EMS-4001 User Manual

User Instructions

Model EMS-4001
Expansion Master Station

®

Audiocom

9350-7713-000 Rev. B, 3/2005

Intercom Systems

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FCC Statement

This equipment uses, and can radiate radio frequency energy that may cause interference to radio
communications if not installed in accordance with this manual. The equipment has been tested
and found to comply with the limits of a Class A computing device pursuant to Subpart J, Part 15
of FCC Rules which are designed to provide reasonable protection against such interference
when operated in a commercial environment. Operation of this equipment in a residential area
may cause interference which the user (at his own expense) will be required to correct.

This product meets Electromagnetic Compatibility Directive 89/336/EEC

TRADEMARKS

Audiocom
Clear-Com
Names of other products mentioned herein are used for
identification purposes only and may be trademarks and/or
registered trademarks of their respective companies.

COPYRIGHT

Copyright © 2002 Telex Communications, Inc. All rights
reserved.

WARRANTY INFORMATION

Products are warranted by Telex Communications, Inc. to be
free from defects in materials and workmanship for a period of
one year from the date of sale.

The sole obligation of Telex during the warranty period is to
provide, without charge, parts and labor necessary to remedy
covered defects appearing in products returned prepaid to
Telex. This warranty does not cover any defect, malfunction or
failure caused beyond the control of Telex, including unreason­able or negligent operation, abuse, accident, failure to follow
instructions in the manual, defective or improper associated
equipment, attempts at modification and repair not authorized
by Telex, and shipping damage. Products with their serial
numbers removed or effaced are not covered by this warranty.

To obtain warranty service, follow the procedures entitled
“Procedure for Returns” and “ Shipping to Manufacturer for
Repair or Adjustment”.

This warranty is the sole and exclusive express warranty given
with respect to Audiocom products. It is the responsibility of
the user to determine before purchase that this product is
suitable for the user’s intended purpose.

ANY AND ALL IMPLIED WARRANTIES, INCLUDING THE
IMPLIED WARRANTY OF MERCHANTABILITY ARE LIMITED
TO THE DURATION OF THIS EXPRESS LIMITED WAR­RANTY.

NEITHER TELEX NOR THE DEALER WHO SELLS TELEX
PRODUCTS IS LIABLE FOR INCIDENTAL OR CONSEQUEN­TIAL DAMAGES OF ANY KIND.

®

is a registered trademark of Telex Communications.

®

is a registered trademark of Clear-Com Systems.

CUSTOMER SUPPORT

Technical questions should be directed to:

Customer Service Department
Telex
12000 Portland Avenue South
Burnsville, MN 55337 U.S.A
Telephone: [phone]
Fax: [phone]

RETURN SHIPPING INSTRUCTIONS
Procedure for Returns

If a return is necessary, contact the dealer where this unit was
purchased.

If a return through the dealer is not possible, obtain a
RETURN AUTHORIZATION from:

Customer Service Department
Telex Communications, Inc.
Telephone: [phone] or [phone]
Fax: [phone] or [phone]

DO NOT RETURN ANY EQUIPMENT DIRECTLY TO THE
FACTORY WITHOUT FIRST OBTAINING A RETURN
AUTHORIZATION.

Be prepared to provide the company name, address, phone
number, a person to contact regarding the return, purchase
order number, the type and quantity of equipment, a descrip­tion of the problem and the serial number(s).

Shipping to Manufacturer for Repair or Adjustment

All shipments of products should be made via United Parcel
Service or the best available shipper prepaid. The equipment
should be shipped in the original packing carton; if that is not
available, use any suitable container that is rigid and of
adequate size. If a substitute container is used, the equipment
should be wrapped in paper and surrounded with at least four
inches of excelsior or similar shock-absorbing material. All
returns must include the return authorization number. Units
sent for repair or adjustment DO NOT need a return authoriza­tion number

Factory Service department
Telex Communications, Inc.
West 1st Street
Blue Earth, MN 56013 U.S.A.

Upon completion of any repair the equipment will be returned
via United Parcel Service or specified shipper collect.

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Table of Contents

Description ................................................................................ 4

Features ..................................................................................... 4

Installation ................................................................................. 5

Unpacking ..................................................................................................................................... 5

Configuration Pre-check .......................................................... 6

Balanced/Unbalanced Switch ......................................................................................................6

Direct Program Listen Enable/Disable Jumpers ....................................................................... 6

Sidetone Trimmers ........................................................................................................................ 6

Mounting Configurations ............................................................................................................ 8

Connection Notes .......................................................................................................................... 8

Cables............................................................................................................................................. 8

Power-Up ....................................................................................................................................... 9

Sidetone Adjustments ................................................................................................................... 9

Operation................................................................................. 10

Specifications........................................................................... 10

General ........................................................................................................................................ 10

Program Input Connectors ........................................................................................................10

Intercom Channels, Balanced Mode (BAL/UNBAL switch set to BAL) ............................... 10

Intercom Channel, Unbalanced Mode (BAL/UNBAL switch set to UNBAL) ...................... 11

Expansion Input/Output ............................................................................................................ 11

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Description

The EMS-4001 adds four powered intercom channels to an MS-2001 Master Station, and it provides talk, listen and
call buttons for the added channels. Up to four EMS-4001 Expansion Master Stations may be connected to the MS­2001 to add up to 16 channels (18 channels total). The MS-2001 microphone is used to talkback to the EMS-4001
channels, and the MS-2001 speaker is typically used for listening. However, there are also separate speaker jacks on
the back panel of the EMS-4001 for independent monitor speakers, if desired. There are also 4 additional program
inputs on the back of the EMS-4001, one for each added channel.

The MS-2001/EMS-4001 combination can be used as a simple, multichannel intercom user station. In this configura­tion, the program inputs (and possibly the PA output of the MS-2001) are most likely not used, and the station
operator has only talk, listen and call capability. It is also possible that advanced features of the MS-2001, such as
Mic Kill Send, might be turned off. Alternatively, the MS-2001/EMS-4001 can be used as a master station. In this
application, one or more program inputs and the PA output may be connected, and the program signals to the inter­com channels can be turned on or off from the MS-2001. Additionally, the Mic Kill Send feature can be enabled, and
microphones on any channels may then be turned off from the MS-2001.

Features

Figure 1 - EMS-4001 Front and back features.

1. Intercom Talk Keys: Momentary or latching (hands-free operation possible).

2. Call Keys: used to call intercom channels and to indicate incoming calls.

3. Intercom Listen Keys: Momentary or latching operation possible.

4. Channel Power Status Indicators: The indicators are green for normal operation and change to red if there is a

short circuit or overload condition on a power output line. If an indicator turns red, either disconnect the
corresponding channel connector or turn off the intercom systems and locate the problem before resuming
operation.

5. Universal AC Power Connector: The unit accepts any input power in the range of 100-240 VAC, 50/60 Hz.

6. Intercom Channel Connectors: These connectors provide the power and audio connections for each of the four

intercom channels.

7. EXP IN and EXP OUT Connectors: The EXP IN connector receives the microphone audio signal from the

MS-2001, and it sends the monaural mix of the four EMS-4001 channels to the MS-2001 speaker or headset.
The EXP OUT connector connects to the EXP IN connector of an additional EMS-4001. Up to four EMS-4001
Expansion Master Stations may be daisy chained with the EXP IN and EXP OUT connectors. An EXP IN/OUT
cable is supplied with each EMS-4001.

8. SPEAKERS: Usually, the listen mix of all four EMS-4001 channels is sent to the MS-2001 speaker or headset

via the EXP IN connector. Alternatively, speakers may be connected to one or more of the speaker outputs of the
EMS-4001.

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