RTS IFB-325 User manual

IFB-325
Portable User Station
Talent Electronics
User Manual
93507488000 Rev E August / 2007

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 2007 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
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 (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 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
This package should include the following:
QTY PART NUMBER DESCRIPTION
1 90107488000 IFB325 Assembly
1 93507488000 Operation Manual
1 38109675 Certificate of Conformity
1 38110387 Warranty

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
Final Assembly ..........................................................7
Connector Plate Assembly .........................................7
PC Board Assembly ...................................................8
Chapter 4
Diagrams ...................................................................9
Final Assembly, IFB-325 Rev P ..............................10
Connector Plate Assembly, IFB325 Rev G ..............11
PC Board Assembly, IFB325 ...................................12
IFB Schematic Page 1 90277477000 ......................13
IFB Schematic Page 2 90277477000 ......................14
IFB Schematic Page 3 90277477000 ......................15
Connector Assemblies, IFB325 ...............................16
Notes ........................................................................17

3
CHAPTER 1
Introduction and Description
Description and Specifications
General
The IFB325 is a portable user station for use with RTS®2-wire intercom systems. The IFB325 is a listen-only IFB belt pack
that can be used to listen to only one intercom channel.
Features
•Powered externally, via the intercom system power supply on channel 1
•Power ON indicator LED
•Headset / earset jack set for 150Ωoperation
•Internal jumper selection of intercom channel 1 or channel 2 (default to channel 2)
Connections and Controls
The IFB325 has the following connections and controls:
•Intercom/program volume control
•Headset connector that accepts 1/4” monaural phone plug
•Channel connector that accepts and XLR type 3-pin connector for intercom line and power input

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” (88mm) W x 1.8” (45.7mm) D
Weight
1.0 pound (0.45kg)
Interface Requirements
Earset
150 to 600Ωheadphones
RTS Intercom Channel
Input Level: 2Vp-p (0dBu) nominal
Input Impedance: 200Ω±5%
Noise Contribution
less than -60dB on the line
Headphone Amplifier
Voltage Gain
27 ±3dB from the line
Maximum Output
165mW into 150Ω
Frequency Response
250Hz to 8kHz +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 LED indicator: This LED glows green when the belt pack is connected to a functioning intercom channel.
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 IFB325 intercom channel is connected via a 3-pin female connector. The IFB325
is powered from the intercom system power supply and will turn ON with the intercom system.
FIGURE 1. IFB325 Connections and Controls
1 2
5
HEADSET
3
IFB-325
4

6
Internal Jumper
The channel termination is set for operation on intercom channel 2, which is compatible with other RTS equipment. If IFB
operation is required on intercom channel 1, 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 weach side and
two screws from the bottom of each side. The jumper location is shown in Figure 2.
FIGURE 2. Internal Jumper
TABLE 1. Internal Jumper
Jumper Number Jumper Function Default Setting
J3 IFB Channel Selections
Pin 4&5 shorted:
Channel 1 IFB Pins 2 & 3 shorted
Pin 2&3 shorted:
Channel 2 IFB (channel 2)
R12
J2
J3
J1
C8
DS1
C10
C18
C12
C6

7
CHAPTER 3
Replacement Parts
Where to Obtain Parts
Part may be ordered directly from Telex, at :
Telex/RTS Systems
12000 Portland Ave South
Burnsville, MN 55337 USA
Telephone: [phone]
Fax: [phone]
Mechanical Parts
Final Assembly
Refer to Figure 3 on page 10 for Item No. location
Connector Plate Assembly
Refer to Figure 4 on page 11 for Item No. location.
Item No. Description Part No.
1 Case 90607374008
2 Top Plate 90707374008
3Connector Plate
Assembly 90207477001
4 PC Board, IFB325 90307477001L
5 Knot, Nylon Body 9160563601
6 Boot, Knob 9160563602
7Screw, 4-40x 0.25LG,
Flat Head 800124001
8 Belt Clip 9110760000
9Screw, 4-40 x 0.25LG,
Pan Head 51845-038
10 Hole Plug, Black 4501261700
11 Screw, 6-32X. 1875 51845073
12 Washer, Lock, Split, #6 50086001
13 Valox 1303001000
14 Loctite Superbonder BE753
15 Label, Serial 3101001700
16 Case, 4030-M 90607374013
17 PC Board, IFB4030-M 90307477033L
18 Screw Locking Agent 59857000
Item No. Description Part No.
1 Connector Plate, Gray 90807374008
2Connector Assembly, IFB
3-Pin Female Line 25027477000
3Connector Assembly, IFB
Phone/Stereo 25027477002
4Nut and Washer Part of
1/4” Jack N/A
5Screw, Part of 40055
Connector N/A
6 Screw Locking Agent 59857000
Item No. Description Part No.

8
PC Board Assembly
Refer to Figure 5 on page 12 for Item No. location.
NOTE: Part number 90307477001 is for the board
without the LEDs. To order the board with the
LEDs, use part number 90307477001L.
Qty Ref Des Part
Number Description
1 C8 51821625 47UF, Cap Al
Elect SMT 25V
1 C6 51821626 100UF, Cap Al
Elect SMT 25V
1 R12 54131005 10K,POT
1 U4 54680412 LM78L12
2 Q1,Q2 54749000 MMBTA13
4D1,D2,D
3,D4 58711100 DIODE 1N4148
2PEM1,P
EM2 59832002 Nut, Self
Clinching 4-40
2 J1,J2 59958104 Connector, ST Locking, 0.059,
M-4
3R7,R8,R
9102404300 10.0K Ohm, Res
1206 1%
2 R1,R2 102404333 22.1K Ohm, Res
1206 1%
1 R35 102404384 75.0K Ohm, Res
1206 1%
2 R23,R24 102513000 0 Ohm, Res 1206
7
R13,R16
,R18,R2
6,R27,R
28,
R29
102513100 10 Ohm, Res 1206
5%
1 R34 102513102 1.0k Ohm, Res
1206 5%
1 R17 102513154 150k Ohm, Res
1206 5%
1 R10 102513472 4.7k Ohm, Res
1206 5%
2 R14,R15 102513473 47k Ohm, Res
1206 5%
1 R21 102513752 7.5K Ohm, Res
1206 5%
1 C17 102879208 220PF, Cap 0805
X7R 50V
2 C1,C2 102880237 0.22UF, Cap 0805
X7R 50V
1 C3 102880239 0.33UF, Cap 0805
X7R 25V
2 C7,C9 102880339 0.01UF, Cap 1206
X7R 50V
4C4,C13,
C20,C21 102881351 0.1UF, Cap 1206
X7R 50V
1 C18 102884510 4.7UF, Cap Al
Elect SMT 35V
1 C25 102884512 10UF, Cap Al
Elect SMT 35V
1 C12 102884600 0.1UF, Cap Al
Elect SMT 50V
1 C10 102884606 1.0UF, Cap Al
Elect SMT 50V
1 J3 590089005 Connector, ST Locking, 0.100,
M-5
1 U2 760374 Low Power Audio
Amp MC34119D
1U1 16030833S
MLM833
1 TP1 2017001400 Connector, Test
Point
19040747700
0Raw PCB
1 2515001500 Jumper
1 64106003 Support Bracket
1 C5 517002081 2200UF, Cap 16V
2 C15,C27 517002116 2200UF, Cap 25V

9
CHAPTER 4
Diagrams
DRAWING NUMBER TITLE
9010-7488-000 Figure 3 Final Assembly, IFB325
9020-7477-001 Figure 4 Connector Plate Assembly, IFB325
9030-7477-001 Figure 5 PC Board Assembly, IFB325
9027-7477-001 Figure 6, Figure 7, and Figure 8 Schematic, IFB325
25027477 Figure 9 Connector Assemblies, IFB-325

10
FIGURE 3. Final Assembly, IFB-325 Rev P

11
FIGURE 4. Connector Plate Assembly, IFB325 Rev G

12
FIGURE 5. PC Board Assembly, IFB325

13
FIGURE 6. IFB Schematic Page 1 90277477000

14
FIGURE 7. IFB Schematic Page 2 90277477000

15
FIGURE 8. IFB Schematic Page 3 90277477000

16
FIGURE 9. Connector Assemblies, IFB325

17
Notes