Motorola GP328 Plus Service Manual page 15

VHF Receiver Front End Schematic Diagram ....................................................5A-22
VHF Receiver Back End Schematic Diagram ....................................................5A-23
VHF Synthesizer Schematic Diagram ................................................................5A-24
VHF Voltage Controlled Oscillator Schematic Diagram .....................................5A-25
VHF Transmitter Schematic Diagram.................................................................5A-26
VHF Radio Parts List (RF Board) .......................................................................5A-27
9.0 Troubleshooting Charts ...................................................................................5A-31
Troubleshooting Flow Chart for Controller .........................................................5A-31
Troubleshooting Flow Chart for Receiver (Sheet 1 of 2) ....................................5A-32
Troubleshooting Flow Chart for Receiver (Sheet 2 of 2) ....................................5A-33
Troubleshooting Flow Chart for Transmitter .......................................................5A-34
Troubleshooting Flow Chart for Synthesizer ......................................................5A-35
Troubleshooting Flow Chart for VCO .................................................................5A-36
Section 5B Model Chart and Test Specifications (403-470 Mhz)
1.0 Model Chart .......................................................................................................5B-1
2.0 Specifications (for GP328 Plus).........................................................................5B-2
3.0 Specifications (for GP338 Plus/GP338 XLS).....................................................5B-3
4.0 Transmitter.........................................................................................................5B-4
4.1 General.........................................................................................................5B-4
5.0 Receiver.............................................................................................................5B-6
5.1 Receiver Front-End ......................................................................................5B-6
5.2 Receiver Back-End.......................................................................................5B-7
5.3 Automatic Gain Control Circuit .....................................................................5B-8
6.0 Frequency Generation Circuitry.........................................................................5B-9
6.1 Synthesizer.................................................................................................5B-10
6.2 VCO - Voltage Controlled Oscillator...........................................................5B-11
7.0 Notes For All Schematics and Circuit Boards..................................................5B-13
8.0 Circuit Board/Schematic Diagrams and Parts List...........................................5B-15
UHF (403-470MHz) Main Board Top Side PCB No. 8404077G05/G06/G07 .....5B-15
UHF (403-470MHz) Main Board Bottom Side
PCB No. 8404077G05/G06/G07 ................................................................5B-16
UHF (403-470MHz) Main Board Top Side PCB No. 8404077G09 ....................5B-17
UHF (403-470MHz) Main Board Bottom Side PCB No. 8404077G09 ...............5B-18
UHF Controls And Switches Schematic Diagram (sheet 1 of 2) ........................5B-19
UHF Controls And Switches Schematic Diagram
(sheet 2 of 2 for 8404077G09 PCB)...........................................................5B-20
UHF Receiver Front End Schematic Diagram....................................................5B-21
UHF Receiver Back End Schematic Diagram ....................................................5B-22
UHF Synthesizer Schematic Diagram................................................................5B-23
UHF Voltage Controlled Oscillator Schematic Diagram .....................................5B-24
UHF Transmitter Schematic Diagram ................................................................5B-25
UHF Band 1 Radio Parts List (RF Board) ..........................................................5B-26
9.0 Troubleshooting charts ....................................................................................5B-29
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