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Motorola
Two-Way Radio
GP328
Motorola GP328 Detailed Service Manual
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6B-46
Troubleshooti
ng
charts
ST
ART
No
LO?
Tx
Carrier?
VCO
OK
Check
R3829
TRB
=
3.2V?
Pin
10
>1V?
L3831,
L3832,
L3833
O/
C?
Change
L3831,
L38
32
Change
U3801
AUX
3
High?
Check
U
3701
Pin
2
for
3
.2V
Pin
19
=0V
AUX
3
Low?
Change
U3801
Vc
t
r
l0
V
or
13V?
L3821,
L3822,
L3823
Open
Circ
uit?
Change
U3801
Change
L3821,
L3822,
L3823,L243
Change
U3701
Check
for
faulty
part
s
or
dry
joints
of
L3812
C3
806,
R3806,
R3
802
&
L380
1
A
A
No
No
Ye
s
Ye
s
Ye
s
No
No
Ye
s
Ye
s
Ye
s
No
Ye
s
No
No
Ye
s
Ye
s
No
No
Check
R381
1,
L381
1
for
dry
joint
or
faulty
No
Troubleshooting
Flow
Chart
for
VCO
Ye
s
151
153
Table of Contents
Default Chapter
2
Computer Software Copyrights
2
Safety and General Information
5
Approved Accessories
6
Blasting Caps and Areas
7
Operational Cautions
7
Operational Warnings
7
Potentially Explosive Atmospheres
7
Table of Contents
9
Section 1 Introduction
17
Scope of Manual
17
Warranty and Service Support
17
Warranty Period
17
After Warranty Period
17
Piece Parts
18
Technical Support
18
Service Aids
19
Recommended Test Tools
19
Power up Self-Test
21
Error Codes
21
Controller Information
23
Overview
23
Radio Power Distribution
23
Controller Board
24
General
24
Digital Architecture
25
Controller Schematics (330-400Mhz for 8485726Z01, 403-470Mhz for 8480450Z03 & 450-527Mhz for 8485641Z02)
27
Complete Controller Schematic Diagram
27
Controller ASFIC/ON_OFF Schematic Diagram
28
Controller Micro Processor Schematic Diagram
29
Controller Audio Power Amplifier Schematic Diagram
31
Controller Schematics (330-400Mhz for 8485726Z04, 403-470Mhz for 8480450Z13 & 450-527Mhz for 8485641Z06)
33
Controller ASFIC/ON_OFF Schematic Diagram
34
Controller Micro Processor Schematic Diagram
35
Controller Audio Power Amplifier Schematic Diagram
37
Controller Interface Schematic Diagram
38
Controller Schematics (136-174Mhz for 8486062B09 & 8486062B12)
39
Controller ASFIC/ON_OFF Schematic Diagram
40
Controller Micro Processor Schematic Diagram
41
Controller Audio Power Amplifier Schematic Diagram
43
Controller Schematics (136-174Mhz) for PCB 8486062B16
45
Controller ASFIC/ON_OFF Schematic Diagram
46
Controller Micro Processor Schematic Diagram
47
Controller Memory Schematic Diagram
48
Controller Audio Power Amplifier Schematic Diagram
49
Controller Interface Schematic Diagram
50
Controller Schematics
51
Controller Hierarchical Diagram
51
Complete Controller Schematic Diagram
52
Controller ASFIC/ON_OFF Schematic Diagram
53
Controller Microprocessor Schematic Diagram
54
Controller Interface and Memory Schematic Diagram
55
Controller Audio Power Amplifier Schematic Diagram
56
Keypad Board Information
57
Theory of Operation
57
Troubleshooting Chart
58
Parts List (Keypad Basic)
59
Keypad Board and Schematic Diagram
61
Keypad Board Top and Bottom View (PCB No. 8480574Z05)
61
Keypad Board Schematic Diagram
62
Section 6A
63
Model Chart and Test Specifications (403-470 Mhz)
63
Model Chart
63
Specifications
65
Transmitter
65
General
65
Transmitter
66
Receiver
68
Receiver Front-End
68
Receiver Back-End
69
Automatic Gain Control Circuit
70
Frequency Generation Circuitry
71
Synthesizer
72
VCO - Voltage Controlled Oscillator
73
Notes for All Schematics and Circuit Boards
75
Circuit Board/Schematic Diagrams and Parts List
77
UHF (403-470Mhz) Main Board Top Side PCB No. 8480450Z03
77
UHF (403-470Mhz) Main Board Bottom Side PCB No. 8480450Z03
78
UHF Controls and Switches Schematic Diagram
79
UHF Receiver Front End Schematic Diagram
80
UHF Receiver Back End Schematic Diagram
81
UHF Synthesizer Schematic Diagram
82
UHF Voltage Controlled Oscillator Schematic Diagram
83
UHF Transmitter Schematic Diagram
84
UHF Radio Parts List
85
Circuit Board/Schematic Diagrams and Parts List
88
UHF (403-470Mhz) Main Board Top Side PCB No. 8480450Z13
88
UHF (403-470Mhz) Main Board Bottom Side PCB No. 8480450Z13
89
UHF Controls and Switches Schematic Diagram
90
UHF Receiver Front End Schematic Diagram
91
UHF Receiver Back End Schematic Diagram
92
UHF Synthesizer Schematic Diagram
93
UHF Voltage Controlled Oscillator Schematic Diagram
94
UHF Harmonic Filter Schematic Diagram
95
UHF Transmitter Schematic Diagram
96
UHF Radio Parts List
97
Troubleshooting Charts
101
Troubleshooting Flow Chart for Controller
101
Troubleshooting Flow Chart for Receiver (Sheet 1
102
Troubleshooting Flow Chart for Receiver (Sheet 2
103
Troubleshooting Flow Chart for Transmitter
104
Troubleshooting Flow Chart for Synthesizer
105
Troubleshooting Flow Chart for VCO
106
Section 6B
107
Model Chart and Test Specifications (136-174 Mhz)
107
Model Chart
107
Specifications
109
Transmitter
109
General
109
Transmitter
110
Receiver
112
Receiver Front-End
112
Receiver Back-End
113
Automatic Gain Control Circuit
114
Frequency Generation Circuitry
115
Synthesizer
116
VCO - Voltage Controlled Oscillator
117
Notes for All Schematics and Circuit Boards
119
Circuit Board/Schematic Diagrams and Parts List
121
VHF (136-174Mhz) Main Board Top Side PCB No. 8486062B09
121
VHF (136-174Mhz) Main Board Bottom Side PCB No. 8486062B09
122
VHF (136-174Mhz) Main Board Top Side PCB No. 8486062B12
123
VHF (136-174Mhz) Main Board Bottom Side PCB No. 8486062B12
124
VHF Controls and Switches Schematic Diagram
125
VHF Receiver Front End Schematic Diagram
126
VHF Receiver Back End Schematic Diagram
127
VHF Synthesizer Schematic Diagram
128
VHF Voltage Controlled Oscillator Schematic Diagram
129
VHF Transmitter Schematic Diagram
130
VHF Radio Parts List
131
Circuit Board/Schematic Diagrams and Parts List
135
VHF (136-174Mhz) Main Board Top Side PCB No. 8486062B16
135
VHF (136-174Mhz) Main Board Bottom Side PCB No. 8486062B16
136
VHF Controls and Switches Schematic Diagram
137
VHF Receiver Front End Schematic Diagram
138
VHF Receiver Back End Schematic Diagram
139
VHF Synthesizer Schematic Diagram
140
VHF Voltage Controlled Oscillator Schematic Diagram
141
VHF Transmitter Schematic Diagram
142
VHF Radio Parts List
143
Troubleshooting Charts
147
Troubleshooting Flow Chart for Controller
147
Troubleshooting Flow Chart for Receiver (Sheet 1
148
Troubleshooting Flow Chart for Receiver (Sheet 2
149
Troubleshooting Flow Chart for Transmitter
150
Troubleshooting Flow Chart for Synthesizer
151
Troubleshooting Flow Chart for VCO
152
Section 6C
153
Model Chart and Test Specifications (450-527 Mhz)
153
Model Chart
153
Specifications
154
Transmitter
155
General
155
Receiver
157
Receiver Front-End
157
Receiver Back-End
158
Automatic Gain Control Circuit
159
Frequency Generation Circuitry
160
Synthesizer
161
VCO - Voltage Controlled Oscillator
162
Notes for All Schematics and Circuit Boards
164
Circuit Board/Schematic Diagrams and Parts List
165
UHF Band 2 (450-527Mhz) Main Board Top Side PCB No. 8485641Z02
165
UHF Band 2 (450-527Mhz) Main Board Bottom Side PCB No. 8485641Z02
166
UHF Band 2 Controls and Switches Schematic Diagram
167
UHF Band 2 Receiver Front End Schematic Diagram
168
UHF Band 2 Receiver Back End Schematic Diagram
169
UHF Band 2 Synthesizer Schematic Diagram
170
UHF Band 2 Voltage Controlled Oscillator Schematic Diagram
171
UHF Band 2 Transmitter Schematic Diagram
172
UHF Band 2 Radio Parts List
173
Circuit Board/Schematic Diagrams and Parts List
176
Circuit Board/Schematic Diagrams and Parts List
177
UHF Band 2 (450-527Mhz) Main Board Bottom Side PCB No. 8485641Z06
178
UHF Band 2 Controls and Switches Schematic Diagram
179
UHF Band 2 Receiver Front End Schematic Diagram
180
UHF Band 2 Receiver Back End Schematic Diagram
181
UHF Band 2 Synthesizer Schematic Diagram
182
UHF Band 2 Voltage Controlled Oscillator Schematic Diagram
183
UHF Band 2 Transmitter Schematic Diagram
184
UHF Band 2 Radio Parts List
185
Troubleshooting Charts
189
Troubleshooting Flow Chart for Receiver (Sheet 1 of 2)
190
Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)
191
Troubleshooting Flow Chart for Transmitter
192
Troubleshooting Flow Chart for Synthesizer
193
Troubleshooting Flow Chart for VCO
194
Power Amplifier
197
Troubleshooting Flow Chart for Controller
231
Model Charts
237
Specifications
239
Transmitter
240
Temperature Cut Back Circuit
241
Receiver
242
Receiver Back-End
243
Frequency Generation Circuitry
244
Synthesizer
245
VCO - Voltage Controlled Oscillator
246
Notes for All Schematics and Circuit Boards
247
Circuit Board/Schematic Diagrams and Parts List
249
Lowband 29-42/35-50Mhz Main Board Bottom Side PCB No. 8486291A02
250
Lowband 29-42/35-50Mhz Controls and Switches Schematic Diagram
251
Lowband 29-42/35-50Mhz Overall Receiver Schematic Diagram
252
Lowband 29-42/35-50Mhz Receiver Front End Schematic Diagram
253
Lowband 29-42/35-50Mhz Receiver Back End Schematic Diagram
254
Lowband 29-42/35-50Mhz Synthesizer Schematic Diagram
255
Lowband 29-42/35-50Mhz Voltage Controlled Oscillator Schematic Diagram
256
Lowband 29-42/35-50Mhz Transmitter Schematic Diagram
257
Lowband 29-42/35-50Mhz Radio Parts List
258
Troubleshooting Charts
261
Troubleshooting Flow Chart for Receiver (Sheet 1 of 2)
262
Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)
263
Troubleshooting Flow Chart for Transmitter
264
Troubleshooting Flow Chart for Synthesizer
265
Troubleshooting Flow Chart for VCO
266
Section 7 Flex Layout/Schematic Diagrams and Parts Lists
267
Keypad-Controller Interconnect Flex
267
Parts List for Keypad-Controller Interconnect Flex
268
Schematic for Universal Connector Flex
269
Other manuals for Motorola GP328
User Manual
30 pages
Operation Guide
1 page
Quick Reference Card
23 pages
Specifications
4 pages
Specification
2 pages
4
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Motorola GP328 Specifications
General
Brand
Motorola
Model
GP328
Category
Two-Way Radio
Language
English
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