Telex RadioCom TR-200 User manual

-) TELEX
Service Manual
PROFESSIONAL
WIRELESS
INTERCOMSYSTEM
TR-200 SERIES
TELEX,

Table of Contents
Page
...........................................................................................
CHAPTER 1-GENERALINEORMATION 1-1
GENERALDESCRIPTION
................................................................................................................ 1-1
SPECIFICATIONSTR-200
................................................................................................................. 1-2
CONTROLS
AND CONNECTIONS .................................................................................................. 1-3
ExternalControls
............................................................................................................................. 1-3
InternalControls
.............................................................................................................................. 1-4
CHAPTER2
. IDENTIFICATIONOF CIRCUITBOARD VERSION ................................................. 2-1
GENERAL
........................................................................................................................................... 2-1
~ . ~-~~
CHAPTER 3 . TRANSMITAND RECEI~ CIRCUIT BOARDS ....................................................... 3-1
TR-200 INSTRUMENTDISASSEMBLY
.......................................................................................... 3-1
TRANSMITBOARD
.......................................................................................................................... 3-3
CIRCUITDESCRIPTION
............................................................................................................... 3-3
................................................................ ...................................
ALIGNMNENTPROCEDURE , 3-3
VOLTAGE TABLES
- TRANSMITBOARD ................................................................................. 3-4
RECEIVE BOARD
.............................................................................................................................. 3-5
CIRCUITDESCRIPTION
.............................................................................................................. 3-5
.........................................................................................................
ALIGNMENTPROCEDURE 3-5
.........................................................................................
OPTIONS - CIRCUITDESCRIPITION 3-5
VOLTAGE TABLES
- RECEIVEBOARD .................................................................................... 3-6
I '
\ !
...
ELECTRICALPARTS RECEIVEPCB ASSEMBLY (879977-*) ................................................
3-15
ELECTRICALPARTS TRANSMITPCB ASSEMBLY (879976-*)
................................................ 3-17

List of Illustrations
Figure
1-1
1-2
1-3
2-1
3-1
3-2
. 1
Page
HeadsetXLR ConnectorWiring .............................................................................. 1-3
External Controls,TR-200
.................................................................................. 1-3
InternalControls,TR-200
........................................................................................ 1-9
Version Flow Chart
.................................................................................................. 2-1
.......................................................................................
Exploded View of TR-200 3-2
P.C. Board Assembly - Receiver (879977-)ComponentLayout
(ComponentSide)
.............................................................................................. 3-9
P.C. BoardAssembly - Transmit (879976-)ComponentLayout
(ComponentSide)
................................................................................................ 3-9
Transmit P.C. BoardAssemblyComponentLayout(Foil SideView)
................... 3-10
Receive
P.C. Board Assembly ComponentLayout (Foil SideView) .................... 3-10
. .
Schemat~cDiagram TR-200Version 4 ..................................................................
3-11
SchematicDiagram TR-2M) Version 3
.................................................................. 3-12
SchematicDiagram TR-200 Version
2 .................................................................. 3-13
SchematicDiagram TR-200 Version 1
................................. 1 ............................ 3-14

CHAPTER 1
GENERALINFORMATION
GENERAL DESCRIPTION
TheTelexModelsTR-200 and TR-200PBelt-pack
Transceivers
are designed with one transmit and
one receive channel.
TheTR-200isaportableunitwhich communicates
in fullduplex with eitherthe BTR-200 base station
or a mirrorimage TR-200.
Push-to-Talkwith Lock-to-TaLk featureswitchfor
the TR-200 and Push-to-Transmit
with Lock-to-
Transmitfeaturefor the TR-200P.
The TR-200 Transceiveroperates in thecontinuous
transmitmode with the audio, to
talk, activatedby
a switch. As many as four TR-200 belt-pack
transceivers can operatein a fully duplex network
with one Telex Model BTR-200 or BTR-200 II
Base Station.
The TR-200P Transceiveroperates in the Push-to-
transmit mode (the transmit and talk function
are
activated together). Any number of TR-200P
transceivers can be used
in a half-duplex network
with one BTR-200 or BTR-200
11 Base Station.
Operate only onetransmitterata time. Attempting
to usetwo transmitterssimultaneouslyon the same
channel
will causeinterference.

SPECIFICATIONS TR-200
Overall
PowerRequirements ......................................................... 6 AA cells (Alkaline, NEDA, MN 1500)
Nickel Cadmium Optional
CurrentDrain
................................................................................................................ typc 65 mA
TemperatureRange ............................................................................. 4 to 130'~(-20'~to 55'~)
Dimensions
........................................................................................... 4.25" W x 4.125" H x 2.0" D
(108mm
x 105mmx 51mm)
Weight
........................................................................................................ 1302(369g)with batteries
TransmitAntenna
......................................................................................... 114-wavewire (attached)
ReceiveAntenna
.......................................................................................... 114-wavewire (attached)
Transmit
-
RF Frequency Range ..................................................................................................... 150-216MHz
RF Frequency Stability ............................................................................ C Controlled,0.005%
RF Power Output ........................................................................................................ 50mW Typical
~.
Modulation ......................................................... .......................................... FM, 5000 Hz deviation,
115micro-seconds Pre-emphasis
. .
ModulationLimter ............................................................................................. InternalCompressor
Modulation Frequency Range
........................................................................... 300 to 5000Hz =dB
MicrophoneAudioInput
........................................................................................... 30 to 3500ohms
...
MicrophoneInput Sensluvlty .............................................................. 2 mV Dynamic,4 mV Electret
. .
Radiated Harmonics and Spurious Emissions ....................................................................... -45 dBC,
Exceeds FCC Specifications
FCC
....................................................................................... Type Accepted Under Parts90and 74
%
Receive
RF Frequency Range ..................................................................................................... 150-216MHz
RF Frequency Stabiltiy .................................................................... stControlled, O.QOS%Type
DualConversion Superheterodyne,
FM
...
RF Sensihvity .............................................................................. Lessthan 0.5 pV for 12dB SINAB
IF Selectivity ..................................................................................... 3 dB at 30kHz (CeramicFilter)
. .
Image Rejection .......................................................................................................... 70 dB or better
. .
Squelch Quietmg ........................................................................................................................ 90dB
SquelchThreshold
...................................................................................................... 1.OpV (Internal)
cp-~~~~ ~ . ~ ~~~- ~~ ~~~~~~~ - -- ~~ ~
.................................................................................................................
I
Signal:io-No~seRaao 90dB
Audio Output
.................................................................................. 32 mW into 600 ohms(Headset)
Distortion
............................................................................................. Less than 1% at Rated Output
FCC
.......................................................................................................... Notification Under Part 15

I
I CONTROLS AND CONNECTIONS
External Controls(ReferTo Figure 1-2)
Push-To-Talknock-To-Talk Switch: For Model
TR-200, this switch enables the talk function. For
VolumeOFJ?/ON Control: Thisthumbwheelcon- Model
TR-200J?, this switch enables the transmit
trolserves
as both an off/onswitchand as avolume and audio function and otherwise operates as
control. describedfor
TR-200.
Low Battery and Overmodulation Indicator
LED:,
Low Battery Indicator:
This is part of the
batterycheckcircuit.Whenthepower switchis
placed in the
"ON" position the LED will flash
one time
if the battery is good. A poor bkttery
will cause the
LED to illuminatecontinuously
and
a bad orunusablebatterywillnotcauseany
illuminationat
all.
Talk LED Indicator: cabeled "talk") Will be
illuminatedwhenever the
talk function on the TR-
200
ortransmitfunctiononthe TR-2DOP isenabled.
Headset Jack: A four pin XLR connector for
1nput.Output. The headsetjack will accept six dif-
ferent Telex Model Headsets. Compatible with
otherintercomheadsetswithfourpin
XLR connec-
tors that arewired
as shown in Figure 1-1.
Overmodulation Indicator: Uses the same MICROPHONE
GROUND
LED as the low battery indicator. During the
talk mode,
if the microphone gain is too high,
AUDIO
the LED will illuminatewhen talking.
OUT
02 9
WCROPHONE
AUDIO D Figure 1-1 BALANCED
Headset XLR ConnectorWiring
LOW BATTERYIOVERMODULATION
i INDICATOR LED
rTALK LED INDICATOR
f
&& USH-TO-TALK OFFION
LOCK-TO-TALK SWITCH
l..
. "
d
/
n
HEADSET
BELTCLI -- ~~~.
RECEIVE ANTENNA
/ 1
CONTROL
Figure 1-2
External Controls, TR-200
1-3

DYNAMICIELECTRET MICROPHONE
GAIN CONTROL
BATTERY COMPARTMENT
Figure 1-3
Internal Controls, TR-200
Internal Controls (Refer To Figure 1-3)
D~amiclElectret Switch: This switch allows
selection of "D" when using a Dynamic
Belt Clip: Combination Belt CliplSattery Cover. Microphone or"
E" when using an Electret
AccesstoBatteryCompartment,Microphone
Gain
Microphone.
Control and DynamicIElectret Switch is ac-
complished by removal of belt clip via a quick
NOTE: All Telex headsets that are used with this
release 114
turn fastener. intercom are dynamic microphones. Unit is
- - - - -
-
shipped* the*" position.
lvlicrophone Gain Control: Screwdriver adjus-
tableby removingbeltclipand prying outthesmd
Battery Compartment: Holds 6 AA batteriesin a
rubberplug
to the right of the screwboss. removablebattery holder.

CHAPTER 2
IDENTIFICATION OF CIRCUITBOARD VERSION
GENERAL
Version 1 unitsmay be identifiedby theabsenceof
two 1.2
pH chokesinthe cableconnecting the P.C.
board assembly to the headsetconnector. Versions
2, 3, and 4 have two such chokes immediately
following the
P.C. board connector. Of the three
later versions, the one
in which C45 (transmit
board)
is 4.7 pF is version 2. On versions 3 and 4
thispartis 0.1 pE Onversion 4 only R45 (trpsmit
board) wilI be a wirejumper or zero ohm resistor.
This part is
47 K on all earlierversions.
TWO 1 -2pH VALUE VALUE
CHOKES YES OF 0.1pF
OF JUMPER
IN
.
c45
TRANMIT
R45
LINE
TRANSMIT
BOARD BOARD
h0 4.7pF
VERSION
2 VERSION4
Figure 2-1
Version Flow Ch-irt
2-112-2 Blank

CHAPTER 3
TRANSMIT AND RECEIVE CIRCUIT BOARDS
TR-200INSTRUMENT
4. Unplug the battery and audio cables from the
DISASSEMBLY P.C. board assembly.
5. Lift the P.C. board assembly clear of the rear
1. Remove battery door and removebatteries. case.
2. Remove 3 each #4 and 1each #2 socket head
6. Unsolder the transmit and receive antenna
screwsfrom the back of the unit wires and removethe connectorassembly.
i
3. Turn the TR-200 overandremovethefrontcase
7. Unsolder shield tabs (3 places on transmit
half. board and
3 places on receive board) and
NOTE: When refitting the case front the volume separatetransmitand receiveboards.
controlknobmustbepositioned
so thatthepinsand
8. Reassembly is the reverse of ihe above proce-
slots mate properly. dures.
I Mechanical Parts
Receive ( 879977-*)
Transmit (879976-*)
Item No.
1
Description
MembranePlate
Volume Knob
TransmitPCB Assembly
Stub, li4Turn
Retainer
Cap Screw,#4
- 40 x 3/8", slotted
Cap Screw,
#2 - 56 x 5/8", slotted
Case-L*bel
~---~ ~ ~
Retainer
Strain Relief
ReceivePCB Assembly
I 16 I Battery Clip
17
L.E.D.R~~
1 18 1 Choke, 1.2 uH
. .
19 Terminal
I EI
Audio Coax
Ground Shield
Part No.
450464- 1
51847003
58714000
650270
640063-2
64211005
802239
810102
810103
970010-1
810101
450462
470630
450521
96590002
470620
1506243
810225
96599000
96605000
40055-3
Item No.
22
23
24
25
26
27
28
-29-
30
3 1
32
33
34
35
36
37
38
39
40
41
42
Description
Sprocket
'Screw,
#2 - 56x 1 18' flat head
L. E. D., Green
IDS connector, 4 pin
IDSCableAssembly
WueHarness Assembly
FCC LBbel
BattevP-ackGushion
~~
BatteryClip Cushion
Insulator Shield
Foam Strip
Board spacer, biva
Board Spacer
Nylon Snap Rivet, Black
Case,Front Assembly
Case,Back Assembly
Telex Label
Keypad
Connector Plate
BeltclipAssembly
4
Pin XLR, Male

2 PLACES
(TYPICAL 2 PLACES
4 PIN
WIRING DIAGRAM
5 PIN Li:-1
-
IAGRAM TRANSMIT RECEIVE
I 1
Figure 3-1
ExplodedView of TR-200