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Tait TB7100 Service Manual
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270
T
ransmitter
Fault Findin
g (25
W)
TB7100 Service M
anual
© Tait Electronics
Limited
October 2005
Figur
e 13.18
Components
of concern on the bottom-
side of the main
board
B1 B
AND
COPPER PLA
TE
VCO BO
T CAN
NB BO
T CAN
COPPER PLA
TE
VCO BO
T CAN
H5,
H6 BANDS
267
269
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
Other manuals for Tait TB7100
Installation And Operation Manual
142 pages
Fitting Instruction
20 pages
Operation Manual
40 pages
Installation Guide
28 pages
5
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Tait TB7100 Specifications
General
Brand
Tait
Model
TB7100
Category
Accessories
Language
English
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