RTS IFB-325 User manual

IFB-325
Portable User Station
Talent Electronics
User Manual
9350-7488-000 Rev D 12/2005

PROPRIETARY NOTICE
The RTS product information and design disclosed herein were originated by and
are the property of Telex Communications, Inc. Telex reserves all patent, propri-
etary design, manufacturing, reproduction, use and sales rights thereto, and to any
article disclosed therein, except to the extent rights are expressly granted to oth-
ers.
COPYRIGHT NOTICE
Copyright 2005 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.
CUSTOMER SUPPORT
Technical questions should be directed to:
Customer Service Department
RTS/Telex Communication Inc.
12000 Portland Avenue South.
Burnsville, MN 55337 U.S.A.
Telephone: [phone]
Fax: [phone]
Factory Service: [phone]
Return Shipping Instructions
Customer Service Department
Telex Communications, Inc. (Lincoln, Nebraska)
Telephone: [phone]
Fax: [phone]
Factory Service: [phone]
Please include a note in the box which supplies the company name, address,
phone number, and 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 products should be made via UPS Ground, prepaid (you may
request from Factory Service a different shipment method). Any shipment
upgrades will be paid by the customer. The equipment should be shipped in the
original packing carton. If the original carton 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 Proof of Purchase for warranty repair.
Upon completion 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

Table
of
Contents
Chapter 1
Introduction and Description ......................................................................................................................3
Description and Specifications ....................................................................................................................3
General ........................................................................................................................................................3
Features .......................................................................................................................................................3
Connections and Controls ...........................................................................................................................3
Specifications ..............................................................................................................................................4
Chapter 2
Operation ....................................................................................................................................................5
External Connections and Controls ............................................................................................................5
Internal Jumper ...........................................................................................................................................6
Chapter 3
Replacement Parts .......................................................................................................................................7
Where to Obtain Parts .................................................................................................................................7
Mechanical Parts .........................................................................................................................................7
Chapter 4
Diagrams .....................................................................................................................................................9

3
CHAPTER 1
Introduction and Description
Description and Specifications
General
the IFB-325 is a portable user station for use with RTS 2-wire intercom systems. The IFB-325 is a listen-only IFB belt pack
that can be used to listen to only one intercom channel.
Features
Features of the IFB-325 include:
•Powered externally, via the intercom system power supply on channel one
•Power-ON indicator
•Headset/earset jack set for 150Ωoperation
•Internal jumper selection of intercom channel one or channel two (default to channel two)
Connections and Controls
The IFB-325 has the following connections and controls:
•Intercom/program volume control
•Headset connector that accepts 1/4” monaural phone plug
•Channel connector that accepts an XLR type 3-pin connector for intercom line an power input

Introduction and Description
4
Specifications
General
Channel Supplied Power Requirements
32 VDC nominal (standard RTS line), 50 to 80 mA
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
3.25” (82.6mm)H x 3.5” (88.mm)W x 1.8” (45.7mm) D
Weight
1.0 pounds (0.45kg)
Interface Requirements
Earset
150 to 600Ωheadphones
RTS Intercom Channel
Input Level: 2 Vp-p (0 dBu) nominal
Input Impedance: 200Ω±5%
Noise Contribution
less than -60 dB on the line
Headphone Amplifier
Voltage Gain
27 ±3dB from the line
Maximum Output
165mW into 150Ω
Frequency Response
250 Hz to 8 kHz +1/-4dB
Connector Pin Configurations
Headset Connector
Type: 1/4” Monaural Plug
Sleeve: Headset audio low
Tip: Headset audio high
Intercom Channel Connectors
Type: XLR-3F
Pin 1 Common
Pin 2 Intercom Channel 1 (audio and +32 VDC input)
Pin 3 Intercom Channel 2 (audio)

5
CHAPTER 2
Operation
External Connections and Controls
NOTE: The numbers refer to the callouts in Figure 1.
1. Volume Control: Use this control to adjust the headset/earset listen level.
2. ON indicator: This LED glows green when the belt pack is connected to an intercom channel that is functioning.
3. Headset Connector: This connector accepts a wide-response headset/earset, such as the RTS Model 2233 or Model 2234,
with a 1/4” monaural phone plug.
4. Hole Plug: This hole is for future use.
5. Intercom Channel Connectors: The IFB-325 intercom channel is connected via a 3-pin female connector. The IFB-325 is
powered from the intercom system power supply and will turn ON with the intercom system.
FIGURE 1. IFB-325 Connections and Controls
1 2
5
HEADSET
3
IFB-325
4

Operation
6
Internal Jumper
The channel termination is set for operation on intercom channel two, which is compatible with other RTS equip-
ment. If IFB operation is required on the intercom channel one, an internal jumper must be changed as described
in Table 1.
To gain access to the jumper, disconnect all power and line connections. Remove two screws from the top of
each side and two screws from the bottom of each side. The jumper location is shown in Figure 2.
FIGURE 2. Internal Jumper
JUMPER
NUMBER JUMPER FUNCTION
DEFAULT
SETTING
J3 IFB Channel Selectilon
Pin 4&5 shorted: Channel one IFB
Pin 2&3 shorted: Channel two IFB
Pins 2 & 3
shorted
(Channel 2)
TABLE 1. Internal Jumper
R12
J2
J3
J1
C8
DS1
C10
C18
C12
C6

7
CHAPTER 3
Replacement Parts
Where to Obtain Parts
Parts may be obtained directly from Telex at:
Telex/RTS Systems
12000 Portland Avenue South
Burnsville, MN 55337
Telephone: [phone]
Fax: [phone]
Mechanical Parts
Final Assembly
(Refer to Figure X for Item No. location
Item No. Description Part No.
1 Case, IFB-325 90607374-008
2 Top Plate 90707374-008
3NotUsed
4 Circuit Board Assembly 90307477-001
5 Knot, Nylon Body 9160563-601
6 Boot, Knob 9160563-602
7 Screw, 4-40 x 0.25, Flat Head 800124-001
8 Belt Clip 91107600-00
9 Screw, 4-40 x 0.25, Pan Head 51845-038
10 Hole Plug 4501-2617-00
11 Screw, 4-40 x 0.1875, Pan Head 51845-073
12 Washer, Lock, Split, #4 50086-001
13 Valox 1303-0010-00
14 Loctite Superbonder BF 753
15 Label, Serial 3101001700
16 Not Used
17 Not Used
18 Screw Locking Agent 59857-000
Connector Plate Assembly
(Refer to figure X for Item No. locations)
Item No. Description Part No.
1NotUsed
2 Jack, Phono,1/4” 2013001200
3 Connector, XLR-3F 40055-10
4 Connector, 4-pin 59958-004
5 Contact, Connector 59958-200
6 thru 9 Not Used
10 Connector Plate 90807374-007
11 Screw Locking Agent 59857-000
Final Assembly
(Refer to Figure X for Item No. location
Item No. Description Part No.

Replacement Parts
8
Circuit Board Assembly
(Refer to Figure X)
Ref No. Description Part No.
Support Bracket 64106-003
C1, C2 Capacitor, CM, SM, 0.22μF, 50V 102880-237
C3 Capacitor, CM, SM, 0.33μF, 50V 102880-239
C4 Capacitor, CM, SM, 0.1μF, 50V 102882-351
C5 Capacitor, EL, 2200μF, 16V 102884-412
C6 Capacitor, EL, 100μF, 25V 51821-626
C7 Capacitor, CM, SM, 0.01μF, 50V 102881-339
C8 Capacitor, EL, 47μF, 25V 51821-625
C9 Capacitor, CM, SM, 0.01μF, 50V 102881-339
C10 Capacitor, EL, SM, 1μF, 50V 102884-606
C11 Not Used
C12 Capacitor, EL, SM, 0.1μF, 50V 102884-600
C13 Capacitor, CM, SM, 0.1μF, 50V 102882-351
C14 Not Used
C15 Capacitor, EL, 2200μF, 25V 517004-036
C17 Capacitor, CM, SM,220 pF, 50V 102879-208
C18 Capacitor, EL, SM, 4.7μF, 25V 102884-410
C19 Not Used
C20,
C21
Capacitor, CM, SM, 0.1μF, 50V 102881-351
C22 -
C24
Not Used
C25 Capacitor, EL, 2200μF, 16V 102884-412
D1 - D4 Diode, SM, Switching, 914/4148 58711-100
DS1 LED, Rectangular, Green 58685-101
J1, J2 Connector, St Locking, 0.059, M-4 59958-104
J3 Connector, St Header, 0.100, M-5 590089-005
PEM1 Nut, Self Clinching, 4-40 59832-002
PEM2 Nut, Self Clinching, 4-40 59832-002
Q1, Q2 Transistor, SM, SI NPN,
MMBTA13
54749-000
R1, R2 Resistor, SM, 22.1kΩ, 1%, 1/8W 102404-333
R3-R6 Not Used
R7 Resistor, SM, 10kΩ, 1%, 1/8W 102404-300
R8 Resistor, SM 10kΩ, 5%, 1/8Ω102513-103
R9 Resistor, SM, 10kΩ, 1%, 1/8W 102404-300
R10 Resistor, SM, 4.7kΩ, 5%, 1/8W 102513-472
R11 Not Used
R12 Potentiometer, 10kΩ, 10%, 0.05W 54131-005
R13 Resistor, SM, 10Ω, 5%, 1/8W 102513-100
R14,
R15
Resistor, SM, 47kΩ, 5%1/8W 102513-473
R16 Resistor, SM, 10Ω, 5%, 1/8W 102513-100
R17 Resistor, SM, 150kΩ, 5%, 1/8W 102513-154
R18 Resistor, SM, 10Ω, 5%, 1/8W 102513-100
R19,
R20
Not Used
R21 Resistor, SM, 7.5kΩ, 5%, 1/8W 102513-752
R22 Not Used
R23 Resistor, SM 0Ω, 5%, 1/8W 102513-000
R24,
R25
Not Used
R26 -
R29
Resistor, SM, 10Ω, 5%, 1/8W 102513-100
R30 -
R33
Not Used
R34 Resistor, SM, 1kΩ, 5%, 1/8W 102513-102
R35 Resistor, SM 75kΩ, 1%, 1/8W 102404-384
TP1 Connector, Test Point Terminal 20170014-00
U1 IC, SM, Dual Op Amp, LM833 16030833-
SM1
U2 IC SM, LP Audio Amp, MC34119 16030146-
SM1
U3 Not Used
U4 IC, Voltage Regulator, 12V, 78L12 54680-412
Circuit Board Assembly
(Refer to Figure X)
Ref No. Description Part No.