Hytera HD705 - Default Chapter; Table of Contents

Service Manual Contents
i
Contents
Documentation Information...................................................................................................................1
1. Introduction
........................................................................................................................................2
2. Product Controls
................................................................................................................................3
3. Baseband Section
..............................................................................................................................6
3.1 Power Section
.................................................................................................................................6
3.1.1 Diagram of Power Control
....................................................................................................6
3.1.2 Radio On/Off.........................................................................................................................6
3.1.3 Power Protection
..................................................................................................................7
3.1.4 Power Consumption Control
.................................................................................................7
3.2 Control Section
...............................................................................................................................7
3.2.1 OMAP5912 Dual-core Processor
..........................................................................................7
3.2.2 External Memory
...................................................................................................................9
3.2.3 Clock...................................................................................................................................10
3.2.4 Reset signal
........................................................................................................................11
3.2.5 SPI......................................................................................................................................11
3.2.6 MCBS
P...............................................................................................................................11
3.2.7 USB
....................................................................................................................................12
3.2.8 UAR
T..................................................................................................................................13
3.2.9 I2C
......................................................................................................................................13
3.2.10 MICROWIRE ....................................................................................................................14
3.2.11 MCSI1...............................................................................................................................14
3.3 Audio Section
................................................................................................................................14
3.3.1 Audio Diagram
....................................................................................................................14
3.3.2 Diagram of Signal Flow
.......................................................................................................15
3.3.3 Audio Amplifier
....................................................................................................................16
3.4 Troubleshooting Flow Chart
..........................................................................................................17
3.5 PCB Difference .............................................................................................................................18
4. GPS Circ
uit .......................................................................................................................................19
4.1 Circuit Description
.........................................................................................................................19
4.2 Schematic Diagram
.......................................................................................................................20
4.3 Parts Lis
t.......................................................................................................................................20
4.4 Troubleshooting Flow Chart
..........................................................................................................23
5. Tuning Description
...........................................................................................................................24
6. Interface Definition...........................................................................................................................25
7. UHF1 (400-470MHz) Information
.....................................................................................................32
7.1 Transmitter Circuit
.........................................................................................................................32