RTS LMS-325 User manual

User Manual
LMS-325
Line Monitor Speaker
9350-7490-000 Rev D 11/2006
;;;;;;;;;
;;;;;;;;;
;;;;;;;;;
;;;;;;;;;
;;;;;;;;;
;;;;;;;;;
;;;;;;;;;
LMS325
RTS
VOLUME

PROPRIETARY NOTICE
The 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 2006 by Telex Communications, Inc. All rights reserved.
Reproduction, in whole or in part, without prior written permission from
Telex is prohibited.
WARRANTY NOTICE
See the enclosed warranty card for further details.
CUSTOMER SUPPORT
Technical questions should be directed to:
Customer Service Department
RTS/Telex Communications, Inc.
12000 Portland Avenue South
Burnsville, MN 55337 USA
Telephone: [phone]
Fax: [phone]
RETURN SHIPPING INSTRUCTIONS
Customer Service Department
Telex Communications, Inc. (Lincoln, NE)
Telephone: [phone]
Fax: [phone]
Factory Service: 800-553-5992
Please include a note in the box which supplies 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 THE MANUFACTURER
All shipments of product should be made via UPS Ground, prepaid (you
may request from Factory Service a different shipment method). Any ship-
ment upgrades will be paid by the customer. The equipment should be
shipped in the original packing carton. If the original carton is not avail-
able, use any suitable container that is rigid and of adequate size. If a sub-
stitute container is used, the equipment should be wrapped in paper and
surrounded with at least four (4) inches of excelsior or similar shock-
absorbing material. All shipments must be sent to the following address
and must include the Proof of Purchase for warranty repair. Upon comple-
tion of any repair the equipment will be returned via United Parcel Service
or specified shipper, collect.
Factory Service Department
Telex Communications, Inc.
8601 East Cornhusker Hwy.
Lincoln, NE 68507 U.S.A.
Attn: Service
This package should include the following:

CHAPTER 1 Description and Specifications ....................................................................................1
General Description ....................................................................................................2
Features .......................................................................................................................2
Controls .......................................................................................................................2
Specifications ...............................................................................................................2
General ....................................................................................................................2
Connector Pin Configurations .....................................................................................3
Speaker Amplifier ........................................................................................................3
CHAPTER 2 Operation .....................................................................................................................5
External Connections & Controls ...............................................................................6
Mounting Configurations ............................................................................................7
CHAPTER 3 Replacement Parts .......................................................................................................9
Where to Obtain Parts ...............................................................................................10
Mechanical Parts .......................................................................................................10
CHAPTER 4 Drawings ...................................................................................................................15

1
CHAPTER 1
Description and Specifications
What you will find in this chapter:
•General Description
•Features
•Controls
•General Specifications
•Connector Pin Configurations
•Speaker Amplifier Specifications

Description and Specifications
2
General Description
The LMS-325 is a modular amplified speaker that can be used to maonitor one or two intercom or program channels. The
LMS-325 is a five-watt. eight-ohm modular amplified speaker for use with RTS rack or console-mounted intercom systems.
Features
Features of the LMS-325 include:
•Two monaural phone jacks for two separate audio inputs.
•One 3-pin XLR connector for RTS intercom channels one and two.
•Control to adjust volume of speaker output.
•Control that balances the speaker’s audio level between input one and input two.
•Power externally from a Telex Wall Pack.
Controls
The LMS-325 has the following controls:
•Detented volume control to simultaneously adjust the speaker level for both input lines.
•Control to balance the relative level of the input line one and input line two.
Specifications
General
Impedence
8 ohms
Power Rating
5 watts
Sensitivity
90± dB/2.83V/meter on axis averaged over one octave bands centered at 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz and 8 kHz
when enclosed in a sealed box with a volume of 1.3 liters.
Frequency Response
200 Hz to 10 kHz ± dBon 1/10 octave measurements in a sealed box with a volume of 1.3 liters.
Free Air Resonance
200 Hz to 250 Hz
Stray Magnetic Field
Less than 1 gauss at a distance of 1 cm from chassis.
Mechanical Noise
Free of buzzes and rattles with 5W sinewave input from 100 Hz to 10 kHz

3
Connector Pin Configurations
Environmental Requirements
Storage: -20°C to 80°C; 0% to 95% humidity, non-condensing.
Operating: 0°C to 50°C; 0% to 95% humidity, non-condensing.
Dimensions
1.72” (44mm)H x 8.2”(208mm)W x 8” (203”)D
Weight
2 lbs. 12 oz. (1.25kg)
Connector Pin Configurations
Speaker Inputs
Type: RCA Phone Jacks
Tip: Audio
Sleeve: Common
Type: XLR-3F
Pin 1 Common
Pin 2 RTS Channel 1 audio
Pin 3 RTS Channel 2 audio
External Power
Type: 2.0 mm jack
Internal pin: positive (+)
External shell: negative (-)
Speaker Amplifier
NOTE: Specifications are for INPUT 1 with the balance control set for minimum attenuation. Specifications for INPUT 2 are
identical.
Input Impedance
47 kΩ
Input Level
0.7 Vrms
Output Amplifier Power
5 W maximum, 4 W continuous into 8 Ω
Signal to Noise Ratio
75 dB, reference 2 W into 8 Ω
Total Harmonic Distortion
Less than 0.5% at 2 W nominal.
Balance Control
12 dB maximum relative attentuation.

Description and Specifications
4

5
CHAPTER 2
Operation
What you will find in this chapter:
•External Connections & Controls
•Mounting Configurations

Operation
6
External Connections & Controls
NOTE: The numbers refer to the callouts in Figure 1.
Figure 1. LMS-325 Connections and Controls
1. Volume Control
Use this control to simultaneously adjust the speaker
level for both speaker input lines.
2. 12-15 VDC Input Jack
The LMS-325 is powered from a Telex®Wall Pack
(part number 532006-000). Plug the Wall Pack inot the
12-15 VDC jack and into an AC outlet.
3. Balance Control
This control adjusts the relative level of the Input 1and
Input 2 (Channel 1 and Channel 2, respectively). Use a
small flat-blade screwdriver to adjust the
control.
4. Audio Input Jacks
These 1/4” monaural phone jacks can be used to
connect audio inputs from some other line-level
program sources (an auxiliary output from a radio or
tap player for example).
5. XLR Line Input Connector
This 3-pin female XLR jack can be connected directly
to an RTS™ intercom line. The RTS™ intercom line
may carry Channel 1, Channel 2, or both channels.
12-15 VDC
+
-
2
INPUT 2
LINE LEVEL
TELEX COMMUNICATIONS, INC.
MADE IN USA
LINE
INPUT 1
45
1
3
BAL
;;;;;;;;;;;;;;
;
;;;;;;;;;;;;
;
;
;;;;;;;;;;;;
;
;;;;;;;;;;;;;;
RTS LMS325 VOLUME

7
Mounting Configurations
Mounting Configurations
Optional mounting configurations for modular RTS™ intercom stations are shown in Figure 2 and include rack-mount, con-
sole-mount, desktop, and portable stations.
Figure 2. Optional Mounting Configurations
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;

Operation
8

9
CHAPTER 3
Replacement Parts
What you will find in this chapter:
•Where to obtain parts
•Mechanical Parts
•Electrical Parts

Replacement Parts
10
Where to Obtain Parts
Parts may be obtained directly from Telex at:
Telex/RTS Systems
12000 Portland Ave South
Burnsville, MN 55337
800-392-3497
Fax [phone]
Mechanical Parts
TABLE 3. Mechanical Parts
Final Assembly
(Refer to page 19 for Item No. locations
Item No. Description Part No.
1 Speaker Grill Assembly, LMS-325 9020-7490-000
2 Foam Strip, 1/4” Wide, Grey, 6.0” LG. 4501-0076-02
3 *6* Case Extrusion 9060-6260-00
4 P.C. Board Assembly, LMS-325 9030-7490-000
5 Gasket, Rear Panel 4501-0076-00
6 Screw, Case 9160-6305-00
7 Screw, Metric 1603008
8 Screw, #4-20, Plastite 51856-005
9 Screw, #4-40 x 1/2” LG. 51845-039
10 Rear Panel, LMS325 9080-7490-000
11 Hex Nut, #4 52188-006
12 Insulator, Silicone Pad 57896-003
13 Washer 50013-035
14 Cement 25400-046
15 Thermal Compound 84627-000
TABLE 4. Speaker Grill Assembly
Speaker Grill Assembly
(Refer to Pages 20-21 Item No. locations)
Item No. Description Part No.
1 Bezel, Speaker 9070-6264-00
2 Speaker Grill, LMS325/MCS325 9070-7490-000
3 Label, LMS325 9170-6633-002
4 Spacer 80660636
5
6
7

11
Mechanical Parts
8 Washer, Lock 50049-003
9 Speaker 590530-000
10 Screw 51845-056
11 Conn. Housing, 2-pin 52264-002
12 Terminal, Crimp Style, Snap In 54460-001
13 Wire, 24 AWG, Black 51204-010
14 Wire, 24 AWG, White 51204-009
15 Wire, 24 AWG, Blue 51204-006
16 Potentiometer, 10K Ohm 54131-006
17 Bracket 9110-7490-000
18 Knob, Grey 2703-0034-00
19 Screw 1008602000
20 Mounting Plate 9070-6889-001
TABLE 5. Electrical Parts
PC Board Assembly
Refer to Page 23 for Reference No.
Qty Ref. No. Description Part No.
1 D1 Diode, IN4001, 50V 50745-010
1 C14 Not Installed 51821-012
1 C9 Capacitor, EL, 10 μF, 25V 51821-622
2C10 Capacitor, EL, 47 μF, 25V 51821-642
C11
4
C12
Capacitor, EL, 100 μF, 25V 51821-626
C13
C16
C18
2R8 Resistor, CF, 100 kΩ, 5%, 1/4 W 52154-233
R9
2R11 Resistor, CF, 47 kΩ, 5%, 1/4 W 52154-241
R14
4
R32
Resistor, CF, 22 kΩ, 5%, 1/4 W 52154-249
R33
R38
R39
TABLE 4. Speaker Grill Assembly
Speaker Grill Assembly
(Refer to Pages 20-21 Item No. locations)
Item No. Description Part No.

Replacement Parts
12
8
R28
Resistor, CF, 10 kΩ, 5%, 1/4 W 52154-257
R29
R30
R31
R34
R35
R36
R37
1 R7 Resistor, CF, 1.8 kΩ, 5%, 1/4 W 52154-275
1 R27 Resistor, CF, 2.7 Ω, 5%, 1/4 W 52154-343
2R12 Resistor, CF, 0 Ω, 5%, 1/4 W 52154-971
R17
2C17 Capacitor, Cer. Disc. 10 pF 500 V. 10% 52157-502
C19
1 C6 Capacitor, CM, 0.33 μF, 50V 52676-512
2C5 Capacitor, CM, 1 μF, 50V 52676-517
C15
4
C1
Capacitor, CM, 0.22 μF, 50V 52676-613
C2
C24
C25
2C3 Capacitor, CM, 0.1 μF, 50V 52676-615
C4
2C7 Capacitor, NP, 47 μF, 35V 52710-068
C8
3
R1
Resistor, MF, 1 kΩ, 1%, 1/4W 54044-100R10
R15
1 R2 Resistor, MF, 2 kΩ, 1%, 1/4W 54044-200
2R5 Resistor, MF, 11.5 kΩ, 1%, 1/4W 54045-115
R16
2R3 Resistor, MF, 100 kΩ, 1%, 1/4 W 54046-100
R4
1J3 Connector, ST Locking, 0.100,
M-2 57721-002
1 U1 IC, Audio Amp, NTE 1851 59616-000
1 J2 Connector, DC Power Jack, 2.0mm 59697-001
1 F1 Fuse, Fast Acting, 2A 536004-003
1 J4 Connector, RA XLR, F-3 2018008100
1 U4 760361
1 D6 Diode, Zener, 17V, 1N5354 86770-003
2C20 Capacitor, EL, 2200 μF, 35V 51821-232
C21
TABLE 5. Electrical Parts
PC Board Assembly
Refer to Page 23 for Reference No.
Qty Ref. No. Description Part No.

13
Mechanical Parts
2C22 Capacitor, EL, 0.1 μF, 25V 517004-000
C23
1 R13 Potentiometer, 10kΩ, 30%, 0.08W 14060044-00
1 R18 Potentiometer, 10kΩ, 20%, 0.1W 14090060-00
2U2 IC, Low Noise Dual Op-Amp,
LM833N 1603083300
U3
13
TP1
Terminal with Insert. #ME151-101-
1000 20170014-00
TP2
TP3
TP4
TP5
TP6
TP7
TP8
TP9
TP10
TP11
TP12
TP13
1J1 Connector, RA Dual RCA-Type Jack,
Yellow 20180090-00
1 PC Board Rev E 9040-7490-000
AR Solder Paste BE738
TABLE 5. Electrical Parts
PC Board Assembly
Refer to Page 23 for Reference No.
Qty Ref. No. Description Part No.

Replacement Parts
14

15
CHAPTER 4
Drawings
In this chapter:
•9010-7490-000 LMS-325 Final Assembly Drawing
•9020-7490-000 Speaker Grill Assembly
•9027-7490-000 LMS-325 Schematic Drawing
•9030-7490-000 Speaker Unit Assembly Drawing

Drawings
16