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Tait TB7100 Service Manual
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TB7100 Service
Manual
Cir
cuit Descriptions
53
© Tait Electronics Li
mited
October 2005
Figur
e 4.5
Block diagram
of the CODEC and a
udio cir
cuitry
DAC
CODEC 1
CODEC 2
Level
Shifter
2V3
Supply
Voltage
Divider
Buffer
Amplifier
Summer
Audio P
A
Bias
Network
LPF
Buffer
Amplifier
CODEC and
Audio
CDC RX
VREF
RX CDC IP
RX CDC IN
RX CDC QP
RX CDC QN
DIG RX EN
CDC RX
AGC
CDC RX FE
TUNE
CDC
TX FIN BIAS1
CDC
TX FIN BIAS2
CDC
TX DRV BIAS
CDC
TX PWR CTL
TX
TEMP
TX FWD PWR
TX REV PWR
SYN CDC LFV
CDC
VCO MOD
CDC
VCXO MOD
SYN CDC FCL
Digital Board
AGND
+13V8 BATT
+2V5 CDC
+9V0
+3V3
+3V0
AN
CDC RX
AUD
AUD ITF SPK+
AUD ITF SPK–
ITF RX BEEP IN
ITF CH MIC
AUD
ITF
AUX MIC
AUD
ITF
VOL
WIP DC
CDC
AUD
TAP OUT
CDC RSSI
ITF
AUD
TAP IN
CDC2 DIG SDTO
DIG RX EN
DIG CDC2 SDTI
DIG CDC2 SCLK
DIG CDC2 LRCK
DIG SYS CLK
DIG DAC LA
TCH
DIG DAC SPI DO
DIG DAC SPI CLK
+1V8
DIG CDC
ARSM
CDC DIG
VSFS
CDC DIG
VSDO
DIG CDC
VSDI
CDC DIG BSDO
CDC DIG BSOFS
DIG CDC
ASFS
DIG CDC
ASDI
CDC DIG
ASDO
PSU SYS RST
PSU SYS RST
DIG RX EN
+2V3 FIL
Interface
Power
Supply
Receiver
T
rans-
mitter
Frequency
Synthesizer
Volume
Control
DIG
AUD CS
DIG
AUD UD
DIG
AUD P
A EN1
DIG
AUD P
A EN2
Signal
T
ypes:
RF
analog
clock
digital
asynchronous serial data
synchronous serial data
CDC RX PIN
AGC
52
54
Table of Contents
Tait Contact Information
2
Table of Contents
3
Preface
7
Scope of Manual
7
Hardware and Software Versions
7
Enquiries and Comments
7
Updates of Manual and Equipment
7
Copyright
8
Disclaimer
8
Associated Documentation
8
Publication Record
8
Alert Notices
9
Abbreviations
9
1 Introduction
11
Frequency Bands
11
RF Output Power
12
Product Codes
12
2 Mechanical Design
13
Tray
14
UI Board
14
Receiver Module
15
Transmitter Module
16
SI Board
17
3 Functional Description
19
Receiver Operation
20
RF Hardware
21
Digital Baseband Processing
22
Audio Processing and Signalling
23
Transmitter Operation
24
Audio Processing and Signalling
24
Frequency Synthesizer
25
RF Power Amplifier
28
User Interface Operation
29
System Interface Operation
32
Internal Power Distribution
34
Serial Data
34
General Purpose IO
34
Receiver Audio Processing
34
Tone on Idle
34
Transmitter Audio Processing
35
Opto Isolated Keying
35
Relay Output
35
Fan Control
35
Rssi
35
Receiver Gate
35
Receiver Inhibit
36
Fan Operation
36
4 Circuit Descriptions
39
Transmitter Circuitry
41
Receiver Circuitry
44
Frequency Synthesizer Circuitry
47
Frequency Control Loop
51
CODEC and Audio Circuitry
52
Power Supply Circuitry
56
Interface Circuitry
58
Digital Board
60
5 Connections
63
External Connectors
64
Internal Connectors
68
Transmitter and Receiver Connectors
68
SI Board Connectors
70
UI Board Connectors
72
6 General Information
73
Repair Levels and Website Access
73
Tools, Equipment and Spares
76
Servicing Precautions
77
Test Equipment Setup
80
Replacing Board Components
84
Shielding Cans and Connectors
85
SMT Repair Techniques
87
Computer-Controlled Test Mode (CCTM)
89
Visual Indicators
96
7 Disassembly and Reassembly
97
Removing the Base Station and Opening the Tray
98
Replacing the UI Board
99
Replacing the Receiver Module
100
Replacing the Transmitter Module
101
Disassembling the Transmitter Module
102
Reassembling the Transmitter Module
103
Replacing the si Board
105
Replacing the Fans
106
Replacing the Fan Power Board
107
Replacing the Temperature Sensor Board
107
Replacing the Speaker
107
Final Reassembly
108
8 Servicing Procedures
109
Initial Tasks
109
Final Tasks
121
Power Supply
123
9 Power Supply Fault Finding
125
10 Interface Fault Finding
135
11 Frequency Synthesizer Fault Finding
141
Initial Checks
142
Power Supplies
145
Phase-Locked Loop
153
Loop Filter
159
Receive VCO and Related Circuitry (UHF Radios)
164
Transmit VCO and Related Circuitry (UHF Radios)
173
VCO and Related Circuitry (VHF Radios)
178
Power Supply for FCL
187
VCXO and TCXO Outputs
190
11.10 Signals at TP501 and TP502
193
11.11 VCXO and CODEC Circuitry
196
12 Receiver Fault Finding
199
Faulty Receiver Sensitivity
200
Excessive Loss of Sensitivity
202
Moderate or Slight Loss of Sensitivity
206
Incorrect RSSI Readings
209
Faulty Radio Mute
211
High Receiver Distortion
214
13 Transmitter Fault Finding (25W)
226
Transmitter RF Power
226
Biasing of PA Driver and Pas
237
RF Signal Path
256
14 Transmitter Fault Finding (50W/40W)
271
Power Supplies
274
Transmitter RF Power
283
Biasing of PA Driver and Pas
295
RF Signal Path
318
15 CODEC and Audio Fault Finding
341
Power Supplies
342
Faulty Speaker Audio
345
No Speaker Audio at Auxiliary Connector
352
Faulty Receiver
357
Faulty Modulation
360
Faulty Modulation Using Auxiliary Connector
364
16 Spare Parts
367
Tait General Software Licence Agreement
369
Limited Warranty
370
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142 pages
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Operation Manual
40 pages
Installation Guide
28 pages
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Tait TB7100 Specifications
General
Brand
Tait
Model
TB7100
Category
Accessories
Language
English
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