Telex
User Manual
Lufthansa
LCU-3
Communication Unit
9350-7773-000 Rev b 12/2005
Headset
1 2
LCU-3
Power
LCU-3
2
11
1
LCU-3
Power
2
HEADSET
H
e
a
d
s
e
t
L
C
U
3
1
2
Powe
r
LCU-3
6
Modes of Operation
Figure 4. The LCU-3 Communication unit in battery powered mode of
operation.
Figure 5. The LCU-3 Communication unit also can use the AUX
connection to power the unit. The AUX connection can be
used for a headset as well as to power the unit.
Proprietary Notice
The Audiocom product information
and design disclosed herein were
originated by and are the property
of Telex Communications, Inc.
Telex reserves all patent,
proprietary design, manufacturing,
reproduction, use and sales rights
thereto, and to any article disclosed
therein, except to the extent rights
are expressly granted to others.
Copyright Notice
Copyright 2003 by Telex
Communications, Inc. All rights
reserved. Reproduction in whole or
in part without prior written
permission from Telex is prohibited.
Unpacking and Inspection
Immediately upon receipt of the
equipment, inspect the shipping
container and the contents carefully
for any discrepancies or damage.
Should there be any, notify the
freight company and the dealer at
once.
Warranty Information
See enclosed warranty card
Customer Support
Technical questions shouls be
directed to:
Customer Service Department
RTS/Telex
12000 Portland Ave South
Burnsville, MN 55337 U.S.A.
Telephone: (877) 392-3497
Fax: (800) 323-0498
DO NOT RETURN ANY EQUIPMENT
DIRECTLY TO THE FACTORY
WITHOUT OBTAINING A RETURN
AUTHORIZATION.
Be prepared to provide the company
name, address, phone number, a
person to contact regarding the repair,
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 Audiocom 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 shipments must
be sent to the following address and
must include the Return Authorization:
Factory Service Department
Telex Communications, Inc.
8601 East Cornhusker Hwy
Lincoln, NE 68507
Tel: 1-800-553-5992
Direct: 1-402-4675321
Upon completion of any repair the
equipment will be returned via United
Parcel Service or specified shipper
collect.
Headset
1 2
LCU-3
Power
LCU-3
1
LCU-3
Power
2
HEADSET
4-pin
XLR Connector
9VOLT
BATTERY
CHARGE
+
-
AUX
3
10
Bottom Panel: AUX, XLR, 4-pin male
Pin 1 Talk (electret pwr)
Pin 2 Listen
Pin 3 GND
Pin 4 External Power
Charger connector, 3.5 mm
T = Power
S = Chassis GND
R = Signal GND
Mechanical Specifications
Color Clear Anodized Aluminum
Weight 13.4 oz. / 381 g
Dimensions
Length 5.0 inches / 127 mm
Width 3.5 inches / 88.9 mm
Depth 1.8 inches / 45.7 mm
4 9
Specifications
Power Requirements
Battery 9VDC 250 mAh recharge
able
External Power 12-28 VDC
Electrical Specifications
Gain (Input to Output) +42 dBu ±2 dB
Frequency Response 400 -10 kHz + 1/-3
reference to 1kHz
Noise < -40 dBu
THD% 1%
Max. Output Power 20 mW into 150 ohms
Environmental Specifications
Temperature
Operating: -20 to 50° C
Storage -20 to 80° C
Humidity 0-90% non-condensing
Connectors, Controls and Indicators
Top Panel: Headset connectors, 6.35
mm
T = Listen
R = Talk
S = GND
Contents
General Description .....................................................5
Features ........................................................................ 5
Operations .................................................................... 6
Controls and Connections ............................................6
Specifications............................................................... 9
Modes of Operation .....................................................10
8
General Description
The LCU-3 communication unit, is a simple accessory
allowing three people to communicate in full-duplex mode
(i.e., talking and listening at the same time). With two
headsets, it covers all situations where up to three people
are working closely together as a team to complete some
critical task
The LCU-3 communication unit is used with the
Groundcom Headset 2002 which offers optimum hearing
protection with the critical clarity needed to communicate
in the airline maintenance environment.
5
4. AUX Connector
5. Battery Charger 3.5mm Connector
6. 9 Volt, 250 mAh battery
76
OPERATION
All workers who are connected to the LCU-3 communication unit and use the GroundCom headset 2002 must use
the PTT (push-to-talk) feature to enable their mic.
System Power
The LCU-3 communication unit is powered by a 9 Volt
rechargable battery (see figure 1). It can also be powered
externally through the AUX connector
LCU-3
Headset
LCU-3
1
2
Power
9 Volt battery
Figure 1. LCU-3 9 Volt battery
placement.
Figure 2. AUX Connector.
Controls and Connections
1&2. Headset connectors: The headset connector
takes a 6.35mm stereo plug. When the headset
is plugged into the unit, the unit automatically
turns on. Conversely, when the headset is
unplugged, it turns off.
3. Power ON LED: The power ON LED lights
green when power is active in the product.
Figure 3. Connectinos and Controls of the LCU-3.
9 VOLT
BATTERY
CHARGE
+
-
AUX
1
LCU-3
Power
2
HEADSET
1
To p
2
3
Bottom
4
Headset
LCU-3
1
2
Power
LCU-3
6
9 VOLT
BATTERY
CHARGE
9 VOLT
BATTERY
CHARGE
+
-
AUX
5
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