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Motorola MTX series Theory/Troubleshooting Manual
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6881200C15-A
*6881200C15*
MOTOROLA
and the Stylized M Logo are registered in
the U.S. Patent and T
rademark Office.
All other product or
service names are the property of their respective owners.
© Motorola, Inc. 2003.
All rights reserved. Printed in U.S.A.
Motorola, Inc.
8000 West Sunrise Boulevard
Ft. Lauderdale, FL
33322
59
Table of Contents
Default Chapter
5
Table of Contents
5
Glossary of Terms
8
Introduction
9
Description
9
General
9
Printed Circuit Boards and Flexible Circuits
9
Theory of Operation (Basic Functional Description)
10
Purpose
9
Introduction
10
Radio Power
10
B+ Routing and DC Voltage Distribution
10
VHF or UHF Transceiver)
10
800 Or 900Mhz Transceiver)
10
General
10
Antenna Switch
12
Frequency Generation Unit (See Figure 2)
12
Receiver Front End (See Figure 3)
12
Receiver Back End (See Figure 3)
13
Transmitter (See Figure 4)
13
Vhf/Uhf Transceiver Board
12
800/900Mhz TRANSCEIVER BOARD
14
Antenna Switch
14
Frequency Generation Unit (See Figure 5)
14
Receiver Front End (See Figure 6)
14
Receiver Back End (See Figure 6)
15
Transmitter (See Figure 7)
15
Closed Architecture Controller
16
Audio Signalling Architecture
16
Digital Architecture
16
General (See Figure 8)
16
General (See Figure 9)
16
Audio Signalling Architecture
17
Digital Architecture
17
Theory of Operation (Detailed Functional Description)
18
Open Architecture Controller
16
Introduction
18
Radio Power
18
General
18
And a VHF or UHF Transceiver)
18
B+ Routing and DC Voltage Distribution
19
And an 800 or 900Mhz Transceiver)
19
Vhf/Uhf Transceiver
20
Frequency Generation Unit (FGU)
20
Antenna Switch
21
Receiver Front End
21
Receiver Back End
22
Transmitter
22
800/900Mhz TRANSCEIVER BOARD
23
Frequency Synthesis
23
Antenna Switch
24
Receiver Front End
24
Receiver Back End
25
Transmitter
25
Closed Architecture Controller
25
Microcomputer (U705)
25
Controller Board Circuit Operation
27
Open Architecture Controller
29
Microprocessor (U705) and Associated Circuits
30
Controller Board Circuit Operation
32
UNIVERSAL CONNECTOR (See Tables 2 and 3)
36
Troubleshooting
38
Introduction
38
Troubleshooting Procedure
38
Check Batteries
38
Alignment
38
Check Overall Transmitter Operation
38
Check Overall Receiver Operation
39
Troubleshooting Charts
39
(VHF/UHF Transceiver/Closed Architecture Controller)
40
(800/900Mhz Transceiver/Open Architecture Controller)
41
(VHF/UHF Transmitter RF)
42
(800/900Mhz Transmitter RF)
43
(VHF/UHF Receiver RF)
44
(800/900Mhz Receiver RF)
45
(VHF/UHF DC Switch)
46
(800/900Mhz DC Switch)
47
(VHF/UHF Frequency Generation Unit - FGU)
48
(800/900Mhz Frequency Generation Unit - FGU)
49
(VHF/UHF Voltage Controlled Oscillator - VCO)
50
(800/900Mhz Voltage Controlled Oscillator - VCO)
51
(VHF/UHF, Closed Architecture, no Receive Audio)
52
(800/900Mhz, Open Architecture, no Receive Audio)
53
(VHF/UHF, Closed Architecture, no Transmit Deviation)
54
(800/900Mhz, Open Architecture, no Transmit Deviation)
55
(Closed Architecture Controller)
56
(Open Architecture Controller)
57
(VHF/UHF Only, VCO Crossover Frequency Tune)
58
Motorola, Inc
60
Voltage Measurement and Signal Tracing
39
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Programmer's Reference Guide
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4
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Motorola MTX series Specifications
General
Brand
Motorola
Model
MTX series
Category
Portable Radio
Language
English
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