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Motorola C1004 Service Manual Page 127
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Circuit Board/Schematic Diagram a
nd Parts List (UHF1: 403–447 MHz)
13-2
Figure 13-4. VCO and PLL Sche
matic Diagram
1
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Portable Radios
1
Technical Information Updates
3
Service Manual Feedback Form
4
COPYRIGHT
5
SAFETY INFORMATION
6
DOCUMENT HISTORY
7
Table of Contents
9
Table of Contents vii
11
List of Figures
13
List of Tables
15
Notations Used in This Manual
16
Chapter 1 Maintenance
19
1-2 Introduction
20
Introduction 1-3
21
1-4 Introduction
22
2.1 Test Equipment
23
2.2 Service Aids
24
Programming/Test Cable
25
Mech SW1
27
4.1 RX Audio Circuit
29
4.1.2 Audio Amp
30
4.2 TX Audio Circuit
31
4.2.1 MIC and External MIC
32
4.2.3.1 TX Audio Processing
32
4.3 Microprocessor Circuitry
33
4.3.8 Battery indicator
34
5.1 Introduction
35
5.2 UHF2 Receiver
35
5.2.1 Receiver Front End
36
5.2.2 Receiver Back End
36
5.3 UHF2 Transmitter
37
5.3.4 Auto Power Control
38
5.4.4 Loop Filter
39
5.4.5 Dual VCO
39
5.5 Keypad
40
Table 6-2
43
M30302FCPGP
53
4.7uF (2012)
54
7.3.1 Parts List
62
8.1 Introduction
73
8.2 VHF Receiver
73
8.2.1 Receiver Front End
74
8.2.2 Receiver Back End
74
8.3 VHF Transmitter
75
8.3.4 Auto Power Control
76
8.4.4 Loop Filter
77
8.4.5 Dual VCO
77
8.5 Keypad
78
U401-B
90
CR110 CR111
100
CR114 CR115
100
CR112 CR113
100
10.3.1 Parts List
101
Not for PMUD2441AAL
109
11.1 Introduction
111
11.2 UHF1 Receiver
111
11.2.1 Receiver Front End
112
11.2.2 Receiver Back End
112
11.3 UHF1 Transmitter
113
11.3.4 Auto Power Control
114
11.4.4 Loop Filter
115
11.4.5 Dual VCO
115
11.5 Keypad
116
Table 12-2
119
Parts Lists
123
Reference
125
Designator
125
Motorola Part No. Description
125
8431BEAUHF300
133
UHF R&TTE Rev#MP01
133
SW / VOL1
136
13.3.1 Parts List
138
Replacement Parts
147
A.2.6 Piece Parts
150
Glossary of Terms
151
Term Definition
152
*6878422A01*
154
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