Table Of Contents - Hytera MD78X Service Manual

Service Manual
Documentation Information .................................................................................................................... 1
1. Introduction........................................................................................................................................... 2
2. Product Controls .................................................................................................................................. 3
3. Front Panel Section .............................................................................................................................. 5
4. Baseband Section ................................................................................................................................ 7
4.1 Power Section ................................................................................................................................... 7
4.2 Power On/Off .................................................................................................................................... 8
4.2.1 Power On/Off Key .................................................................................................................. 8
4.2.2 Ignition Signal ......................................................................................................................... 8
4.2.3 Emergency ............................................................................................................................. 8
4.2.4 Power-up Process .................................................................................................................. 9
4.3 Clock ................................................................................................................................................. 9
4.3.1 Input Clock.............................................................................................................................. 9
4.3.2 Output Clock ......................................................................................................................... 10
4.4 Interface Distribution ....................................................................................................................... 10
4.4.1 SPI Interface ......................................................................................................................... 10
4.4.2 MCSI Interface ..................................................................................................................... 10
4.4.3 MICROWIRE Interface ......................................................................................................... 10
4.4.4 SSI Interface .......................................................................................................................... 11
4.4.5 USB Interface ....................................................................................................................... 12
4.4.6 UART Interface ..................................................................................................................... 12
4.4.7 Mobile Accessory Connector (MAC) .................................................................................... 12
4.4.8 Option Board Interface ......................................................................................................... 13
4.5 Audio Section .................................................................................................................................. 15
4.5.1 RX Audio Circuit ................................................................................................................... 15
4.5.2 TX Audio Circuit .................................................................................................................... 16
4.5.3 Troubleshooting Flow Chart ................................................................................................. 17
4.6 PCB Difference ............................................................................................................................... 18
4.6.1 Watchdog circuit ................................................................................................................... 18
5. GPS Circuit.......................................................................................................................................... 19
5.1 Circuit Description........................................................................................................................... 19
5.2 Schematic Diagram ........................................................................................................................ 20
5.3 Parts List ......................................................................................................................................... 20
5.4 Troubleshooting Flow Chart ........................................................................................................... 21
6. Tuning Description ............................................................................................................................. 22
7. Interface Definition ............................................................................................................................. 23
Contents
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Contents