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Hytera Manuals
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MD656
Service manual
Hytera MD656 Service Manual
Md65 series digital mobile radio
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Table Of Contents
208
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Conventions
Notation Conventions
Table of Contents
1 Product Controls
Front Panel
Rear Panel
Bottom View
2 Disassembly and Assembly
Assembling
3 Exploded View and Packaging Guide
Packaging Guide
4 Specifications and Blind Spots
Blind Spots
5 Circuit Description
Audio Output
Front Panel
Keys
Power Supply
Baseband Section
Power Supply Module
Control Module
Powering On/Off
Power On/Off Key
Ignition Signal
Emergency Alarm
Power-Up Process
Clock
Input Clock
Interface Distribution
SPI Interface
MCSI Interface
MICROWIRE Interface
SSI Interface
USB Interface
UART Interface
Mobile Accessory Connector (MAC)
Option Board Interface
Audio Module
RX Audio Path
TX Audio Path
RF Section
Transmitter Circuit
Power Amplifier
TX Buffer Amplifier
Pre-Driver Power Amplifier
Driver Power Amplifier
Low-Pass Filter
Directional Coupler
Output Power Control
Temperature Protection
Receiver Circuit
Receiver Front-End
Receiver Back-End
Frequency Generation Unit (FGU)
PLL Synthesizer
Reference Crystal Oscillator
Vco
GPS Circuit
6 Troubleshooting Flow Chart
Control Circuit
GPS Circuit
Transmitter Circuit
Description of Normal Situations
No Receive
Receiver Circuit
Frequency Generation Unit (FGU)
7 Interface Definition
10-Pin Aviation Interface
DB26 Accessory Interface
Other Interfaces
J1 (to Control Head Socket)
8 Tuning Description
Tools
Tuning Procedures
Tuning the Radio
Testing a Radio
Transmitting
Receiving
Front Panel PCB View
Top Layer
Bottom Layer
Main Board PCB View
10 Block Diagram
Power Supply Module
RF Module
Baseband Module
11 Schematic Diagram
Memory
Omap_Core
Omap_Si_Peripheral
Power
Power CTRL
Codec
Codec_Out
Peripheral2
Peripheral1
Rx-Back-End
Tx-Ctrl
Tx-Pa-Lineup
Fgu-Pll/Dac
Fgu-Vco
Gps
12 Parts List
Main Board
Front Panel
GPS Circuit
Product Controls
Disassembly and Assembly
Assembling
Exploded View and Packaging Guide
Packaging Guide
Specifications and Blind Spots
Blind Spots
Circuit Description
Front Panel
Baseband Section
Power Supply Module
Control Module
Interface Distribution
Audio Module
RF Section
Transmitter Circuit
Receiver Circuit
Frequency Generation Unit (FGU)
GPS Circuit
Troubleshooting Flow Chart
Control Circuit
GPS Circuit
Transmitter Circuit
Receiver Circuit
Frequency Generation Unit (FGU)
Interface Definition
10-Pin Aviation Interface
DB26 Accessory Interface
Other Interfaces
Tuning Description
Tools
Tuning Procedures
Tuning the Radio
Testing a Radio
PCB View
Block Diagram
Power Supply Module
RF Module
Baseband Module
Schematic Diagram
Parts List
Main Board
Front Panel
GPS Circuit
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Quick Links
1
Product Controls
2
Db26 Accessory Interface
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DIGITAL MOBILE RADIO
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Table of Contents
Troubleshooting
Troubleshooting Flow Chart
36
Troubleshooting Flow Chart
137
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