Hytera MD78X User manual

MOBILE RADIO
SERVICE MANUAL

Preface
This manual describes information related with product repair. To repair the product properly, please
read this manual carefully.
This manual is applicable to the following model:
MD78X (X may indicate 2, 5, 6, or 8)
MD78XG (X may indicate 2, 5, 6, or 8)
In this manual, the description related to GPS is applicable to MD78XG only.

Copyright Information
Hytera is the trademark or registered trademark of Hytera Communications Co., Ltd. (the Company) in
PRC and/or other countries or areas. The Company retains the ownership of its trademarks and product
names. All other trademarks and/or product names that may be used in this manual are properties of
their respective owners.
The product described in this manual may include the Company’s computer programs stored in memory
or other media. Laws in PRC and/or other countries or areas protect the exclusive rights of the Company
with respect to its computer programs. The purchase of this product shall not be deemed to grant, either
directly or by implication, any rights to the purchaser regarding the Company’s computer programs. Any
of the Company’s computer programs may not be copied, modified, distributed, decompiled, or
reverse-engineered in any manner without the prior written consent of the Company.
The AMBE+2TM voice coding technology embodied in this product is protected by intellectual property
rights including patent rights, copyrights and trade secrets of Digital Voice Systems, Inc. This voice
coding technology is licensed solely for use within this product. The user of this technology is explicitly
prohibited from attempting to decompile, reverse engineer, or disassemble the Object Code or in any
other way convert the Object Code into a human readable form.
U.S. Patent No: #6,912,495 B2, #6,199,037 B1, #5,870,405, #5,826,222, #5,754,974, #5,701,390,
#5,715,365, #5,649,050, #5,630,011, #5,581,656, #5,517,511, #5,491,772, #5,247,579, #5,226,084 and
#5,195,166.
Disclaimer
The Company endeavors to achieve the accuracy and completeness of this manual, but no warranty of
accuracy or reliability is given. All the specifications and designs are subject to change without notice
due to continuous technology development. No part of this manual may be copied, modified, translated,
or distributed in any manner without the express written permission of us.
We do not guarantee, for any particular purpose, the accuracy, validity, timeliness, legitimacy or
completeness of the Third Party products and contents involved in this manual.
If you have any suggestions or would like to learn more details, please visit our website at:
http://www.hytera.com.

Service Manual
Contents
i
Contents
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
Service Manual
ii
8. UHF1 (400-470MHz 25W) Information ..............................................................................................29
8.1 Transmitter Circuit..........................................................................................................................29
8.1.1 Power Amplifier ....................................................................................................................29
8.1.2 TX BufferAmplifier................................................................................................................29
8.1.3 Pre-driver Power Amplifier ...................................................................................................30
8.1.4 Driver PowerAmplifier..........................................................................................................30
8.1.5 Final Power Amplifier............................................................................................................30
8.1.6 Antenna Switch.....................................................................................................................30
8.1.7 Low-pass Filter.....................................................................................................................30
8.1.8 Directional Coupler...............................................................................................................30
8.1.9 Output Power Control...........................................................................................................31
8.1.10 Thermal and Over-voltage Protections..............................................................................31
8.1.11 Pressure Pad Switch..........................................................................................................31
8.2 Receiver Circuit ..............................................................................................................................31
8.2.1 Receiver Front-end...............................................................................................................32
8.2.2 Receiver Back-end...............................................................................................................33
8.3 Frequency Generation Unit (FGU).................................................................................................33
8.3.1 PLL Synthesizer ...................................................................................................................33
8.3.2 Reference Oscillator.............................................................................................................34
8.3.3 PLL IC...................................................................................................................................34
8.3.4 VCO......................................................................................................................................34
8.4 PCB View........................................................................................................................................36
8.5 Block Diagram ................................................................................................................................40
8.6 Schematic Diagram........................................................................................................................43
8.7 Parts List.........................................................................................................................................57
8.8 Troubleshooting Flow Chart...........................................................................................................95
9. UHF1 (400-470MHz 45W) Information ............................................................................................101
9.1 Transmitter Circuit........................................................................................................................101
9.1.1 Power Amplifier ..................................................................................................................101
9.1.2 TX BufferAmplifier..............................................................................................................101
9.1.3 Pre-driver Power Amplifier .................................................................................................102
9.1.4 Driver PowerAmplifier........................................................................................................102
9.1.5 Final Power Amplifier..........................................................................................................102
9.1.6 Antenna Switch...................................................................................................................102
9.1.7 Low-pass Filter...................................................................................................................102
9.1.8 Directional Coupler.............................................................................................................103
9.1.9 Output Power Control.........................................................................................................103
9.1.10 Thermal and Over-voltage Protections............................................................................103

Service Manual
Contents
iii
9.1.11 Pressure Pad Switch........................................................................................................103
9.2 Receiver Circuit ............................................................................................................................103
9.2.1 Receiver Front-end.............................................................................................................104
9.2.2 Receiver Back-end.............................................................................................................105
9.3 Frequency Generation Unit (FGU)...............................................................................................105
9.3.1 PLL Synthesizer .................................................................................................................105
9.3.2 Reference Oscillator...........................................................................................................106
9.3.3 PLL IC.................................................................................................................................106
9.3.4 VCO....................................................................................................................................107
9.4 PCB View......................................................................................................................................108
9.5 Block Diagram ..............................................................................................................................112
9.6 Schematic Diagram ......................................................................................................................115
9.7 Parts List.......................................................................................................................................129
9.8 Troubleshooting Flow Chart.........................................................................................................167
10. UHF2 (450-520MHz 25W) Information ..........................................................................................173
10.1 Transmitter Circuit......................................................................................................................173
10.1.1 Power Amplifier ................................................................................................................173
10.1.2 TX BufferAmplifier ...........................................................................................................173
10.1.3 Pre-driver Power Amplifier ...............................................................................................174
10.1.4 Driver Power Amplifier......................................................................................................174
10.1.5 Final Power Amplifier .......................................................................................................174
10.1.6 Antenna Switch.................................................................................................................174
10.1.7 Low-pass Filter.................................................................................................................174
10.1.8 Directional Coupler...........................................................................................................175
10.1.9 Output Power Control.......................................................................................................175
10.1.10 Thermal and Over-voltage Protections..........................................................................175
10.1.11 Pressure Pad Switch......................................................................................................175
10.2 Receiver Circuit..........................................................................................................................175
10.2.1 Receiver Front-end...........................................................................................................176
10.2.2 Receiver Back-end...........................................................................................................177
10.3 Frequency Generation Unit (FGU).............................................................................................177
10.3.1 PLL Synthesizer...............................................................................................................177
10.3.2 Reference Oscillator.........................................................................................................178
10.3.3 PLL IC...............................................................................................................................178
10.3.4 VCO..................................................................................................................................178
10.4 PCB View....................................................................................................................................180
10.5 Block Diagram ............................................................................................................................184
10.6 Schematic Diagram....................................................................................................................187

Contents
Service Manual
iv
10.7 Parts List.....................................................................................................................................201
10.8 Troubleshooting Flow Chart.......................................................................................................239
11. UHF2 (450-520MHz 45W) Information ..........................................................................................245
11.1 Transmitter Circuit......................................................................................................................245
11.1.1 Power Amplifier.................................................................................................................245
11.1.2 TX Buffer Amplifier............................................................................................................245
11.1.3 Pre-driver Power Amplifier................................................................................................246
11.1.4 Driver PowerAmplifier......................................................................................................246
11.1.5 Final PowerAmplifier........................................................................................................246
11.1.6 Antenna Switch.................................................................................................................246
11.1.7 Low-pass Filter .................................................................................................................246
11.1.8 Directional Coupler...........................................................................................................247
11.1.9 Output Power Control.......................................................................................................247
11.1.10 Thermal and Over-voltage Protections...........................................................................247
11.1.11 Pressure Pad Switch ......................................................................................................247
11.2 Receiver Circuit..........................................................................................................................247
11.2.1 Receiver Front-end...........................................................................................................248
11.2.2 Receiver Back-end...........................................................................................................249
11.3 Frequency Generation Unit (FGU).............................................................................................249
11.3.1 PLL Synthesizer................................................................................................................249
11.3.2 Reference Oscillator.........................................................................................................250
11.3.3 PLL IC...............................................................................................................................250
11.3.4 VCO..................................................................................................................................251
11.4 PCB View....................................................................................................................................252
11.5 Block Diagram ............................................................................................................................256
11.6 Schematic Diagram....................................................................................................................259
11.7 Parts List.....................................................................................................................................273
11.8 Troubleshooting Flow Chart.......................................................................................................312
12. UHF3 (350-400MHz 25W) Information ..........................................................................................318
12.1 Transmitter Circuit......................................................................................................................318
12.1.1 Power Amplifier ................................................................................................................318
12.1.2 TX BufferAmplifier ...........................................................................................................318
12.1.3 Pre-driver Power Amplifier ...............................................................................................319
12.1.4 Driver PowerAmplifier......................................................................................................319
12.1.5 Final Power Amplifier .......................................................................................................319
12.1.6 Antenna Switch.................................................................................................................319
12.1.7 Low-pass Filter.................................................................................................................319
12.1.8 Directional Coupler...........................................................................................................320

Service Manual
Contents
v
12.1.9 Output Power Control.......................................................................................................320
12.1.10 Thermal and Over-voltage Protections..........................................................................320
12.1.11 Pressure Pad Switch......................................................................................................320
12.2 Receiver Circuit..........................................................................................................................320
12.2.1 Receiver Front-end...........................................................................................................321
12.2.2 Receiver Back-end...........................................................................................................322
12.3 Frequency Generation Unit (FGU).............................................................................................322
12.3.1 PLL Synthesizer...............................................................................................................322
12.3.2 Reference Oscillator.........................................................................................................323
12.3.3 PLL IC...............................................................................................................................323
12.3.4 VCO..................................................................................................................................324
12.4 PCB View....................................................................................................................................325
12.5 Block Diagram ............................................................................................................................329
12.6 Schematic Diagram....................................................................................................................332
12.7 Parts List.....................................................................................................................................346
12.8 Troubleshooting Flow Chart.......................................................................................................385
13. UHF3 (350-400MHz 45W) Information ..........................................................................................391
13.1 Transmitter Circuit......................................................................................................................391
13.1.1 Power Amplifier ................................................................................................................391
13.1.2 TX BufferAmplifier ...........................................................................................................391
13.1.3 Pre-driver Power Amplifier ...............................................................................................392
13.1.4 Driver PowerAmplifier......................................................................................................392
13.1.5 Final PowerAmplifier .......................................................................................................392
13.1.6 Antenna Switch.................................................................................................................392
13.1.7 Low-pass Filter.................................................................................................................392
13.1.8 Directional Coupler...........................................................................................................393
13.1.9 Output Power Control.......................................................................................................393
13.1.10 Thermal and Over-voltage Protections..........................................................................393
13.1.11 Pressure Pad Switch......................................................................................................393
13.2 Receiver Circuit..........................................................................................................................393
13.2.1 Receiver Front-end...........................................................................................................394
13.2.2 Receiver Back-end...........................................................................................................395
13.3 Frequency Generation Unit (FGU).............................................................................................395
13.3.1 PLL Synthesizer...............................................................................................................395
13.3.2 Reference Oscillator.........................................................................................................396
13.3.3 PLL IC...............................................................................................................................396
13.3.4 VCO..................................................................................................................................397
13.4 PCB View....................................................................................................................................398

Contents
Service Manual
vi
13.5 Block Diagram ............................................................................................................................402
13.6 Schematic Diagram....................................................................................................................405
13.7 Parts List.....................................................................................................................................419
13.8 Troubleshooting Flow Chart.......................................................................................................458
14. VHF (136-174MHz 25W) Information.............................................................................................464
14.1 Transmitter Circuit......................................................................................................................464
14.1.1 Power Amplifier ................................................................................................................464
14.1.2 Pre-driver Power Amplifier ...............................................................................................464
14.1.3 Driver PowerAmplifier......................................................................................................465
14.1.4 Final Power Amplifier .......................................................................................................465
14.1.5 Antenna Switch.................................................................................................................465
14.1.6 Low-pass Filter.................................................................................................................465
14.1.7 Directional Coupler...........................................................................................................465
14.1.8 Output Power Control.......................................................................................................466
14.1.9 Thermal and Over-voltage Protections............................................................................466
14.1.10 Pressure Pad Switch......................................................................................................466
14.2 Receiver Circuit..........................................................................................................................466
14.2.1 Receiver Front-end...........................................................................................................467
14.2.2 Receiver Back-end...........................................................................................................468
14.3 Frequency Generation Unit (FGU).............................................................................................468
14.3.1 PLL Synthesizer...............................................................................................................468
14.3.2 Reference Oscillator.........................................................................................................469
14.3.3 PLL IC...............................................................................................................................469
14.3.4 VCO..................................................................................................................................470
14.4 PCB View....................................................................................................................................471
14.5 Block Diagram ............................................................................................................................475
14.6 Schematic Diagram....................................................................................................................478
14.7 Parts List.....................................................................................................................................492
14.8 Troubleshooting Flow Chart.......................................................................................................532
15. VHF (136-174MHz 50W) Information.............................................................................................538
15.1 Transmitter Circuit......................................................................................................................538
15.1.1 PowerAmplifier ................................................................................................................538
15.1.2 Pre-driver Power Amplifier ...............................................................................................538
15.1.3 Driver PowerAmplifier......................................................................................................538
15.1.4 Final PowerAmplifier .......................................................................................................539
15.1.5 Antenna Switch.................................................................................................................539
15.1.6 Low-pass Filter.................................................................................................................539
15.1.7 Directional Coupler...........................................................................................................539

Service Manual
Contents
vii
15.1.8 Output Power Control.......................................................................................................540
15.1.9 Thermal and Over-voltage Protections............................................................................540
15.1.10 Pressure Pad Switch......................................................................................................540
15.2 Receiver Circuit..........................................................................................................................540
15.2.1 Receiver Front-end...........................................................................................................541
15.2.2 Receiver Back-end...........................................................................................................541
15.3 Frequency Generation Unit (FGU).............................................................................................542
15.3.1 PLL Synthesizer...............................................................................................................542
15.3.2 Reference Oscillator.........................................................................................................542
15.3.3 PLL IC...............................................................................................................................542
15.3.4 VCO..................................................................................................................................543
15.4 PCB View....................................................................................................................................545
15.5 Block Diagram ............................................................................................................................549
15.6 Schematic Diagram....................................................................................................................552
15.7 Parts List.....................................................................................................................................566
15.8 Troubleshooting Flow Chart.......................................................................................................607
16. Disassembly and Assembly..........................................................................................................613
16.1 Disassembly ...............................................................................................................................613
16.2 Assembly ....................................................................................................................................614
17. Exploded View................................................................................................................................616
18. Packing Guide ................................................................................................................................620
19. Specifications.................................................................................................................................621

Figures
Service Manual
viii
Figures
Figure 3-1 Diagram of Front Panel.............................................................................................................5
Figure 4-1 Diagram of Power Distribution..................................................................................................7
Figure 4-2 Diagram of Clock Distribution...................................................................................................9
Figure 4-3 Diagram of SPI Interface........................................................................................................10
Figure 4-4 Diagram of MCSI Interface.....................................................................................................10
Figure 4-5 Diagram of MICROWIRE Interface ........................................................................................10
Figure 4-6 Diagram of SSI Interface.........................................................................................................11
Figure 4-7 Diagram of USB Interface.......................................................................................................12
Figure 4-8 Diagram of UART Interface ....................................................................................................12
Figure 4-9 Diagram of Audio Section.......................................................................................................15
Figure 4-10 Watchdog circuit ...................................................................................................................18
Figure 5-1 Diagram of GPS Circuit ..........................................................................................................19
Figure 5-2 GPS Schematic Diagram........................................................................................................20
Figure 8-1 Diagram of Transmitter Circuit................................................................................................29
Figure 8-2 Diagram of Receiver Circuit....................................................................................................32
Figure 8-3 Diagram of IF Processor.........................................................................................................33
Figure 8-4 Diagram of PLL IC ..................................................................................................................34
Figure 8-5 Diagram of VCO .....................................................................................................................35
Figure 9-1 Diagram of Transmitter Circuit..............................................................................................101
Figure 9-2 Diagram of Receiver Circuit..................................................................................................104
Figure 9-3 Diagram of IF Processor.......................................................................................................105
Figure 9-4 Diagram of PLL IC ................................................................................................................106
Figure 9-5 Diagram of VCO ...................................................................................................................107
Figure 10-1 Diagram of Transmitter Circuit............................................................................................173
Figure 10-2 Diagram of Receiver Circuit................................................................................................176
Figure 10-3 Diagram of IF Processor.....................................................................................................177
Figure 10-4 Diagram of PLL IC ..............................................................................................................178
Figure 10-5 Diagram of VCO .................................................................................................................179
Figure 11-1 Diagram of Transmitter Circuit............................................................................................245
Figure 11-2 Diagram of Receiver Circuit................................................................................................248
Figure 11-3 Diagram of IF Processor.....................................................................................................249
Figure 11-4 Diagram of PLL IC...............................................................................................................250
Figure 11-5 Diagram of VCO..................................................................................................................251
Figure 12-1 Diagram of Transmitter Circuit............................................................................................318
Figure 12-2 Diagram of Receiver Circuit................................................................................................321
Figure 12-3 Diagram of IF Processor.....................................................................................................322

Service Manual
Figures
ix
Figure 12-4 Diagram of PLL IC ..............................................................................................................323
Figure 12-5 Diagram of VCO .................................................................................................................324
Figure 13-1 Diagram of Transmitter Circuit............................................................................................391
Figure 13-2 Diagram of Receiver Circuit................................................................................................394
Figure 13-3 Diagram of IF Processor.....................................................................................................395
Figure 13-4 Diagram of PLL IC ..............................................................................................................396
Figure 13-5 Diagram of VCO .................................................................................................................397
Figure 14-1 Diagram of Transmitter Circuit............................................................................................464
Figure 14-2 Diagram of Receiver Circuit................................................................................................467
Figure 14-3 Diagram of IF Processor.....................................................................................................468
Figure 14-4 Diagram of PLL IC ..............................................................................................................469
Figure 14-5 Diagram of VCO .................................................................................................................470
Figure 15-1 Diagram of Transmitter Circuit............................................................................................538
Figure 15-2 Diagram of Receiver Circuit................................................................................................540
Figure 15-3 Diagram of IF Processor.....................................................................................................541
Figure 15-4 Diagram of PLL IC ..............................................................................................................543
Figure 15-5 Diagram of VCO .................................................................................................................544

Tables
Service Manual
x
Tables
Table 4-1 Description on Option Board Interface.....................................................................................14
Table 7-1 J404: to Front Panel Jack ........................................................................................................24
Table 7-2 J4: to Aviation Jack of Front Panel...........................................................................................25
Table 7-3 J2: to LCD Display Jack...........................................................................................................26
Table 7-4 J403: to Accessory Pin Jack ....................................................................................................28

Service Manual
Documentation Information
1
Documentation Information
This section describes the conventions and revision history of this document.
Instructional Icons
Icon Description
Tip Indicates information that can help you make better use of your product.
Note Indicates references that can further describe the related topics.
Caution Indicates situations that could cause data loss or equipment damage.
Warning Indicates situations that could cause minor personal injury.
Danger Indicates situations that could cause major personal injury or even death.
Revision History
Version Release Date Description
R2.0 September 1st, 2010 Initial release
R3.5 October 31st, 2011 Add descriptions on VHF, UHF2 and UHF3.
Update the template.
Add appropriate trunking information.
March 20th, 2012 Update GPS schematic diagram, IF processor diagram,
PLL IC diagram, and all parts lists.

Introduction
Service Manual
2
1. Introduction
Intended User
This manual is intended for use by qualified technicians only.

Service Manual
Product Controls
3
2. Product Controls
Front Panel
No. Part Name No. Part Name
1
Volume Control/Group Call
Selector Knob (trunking mode) 8 Up Key
Volume Control/Channel Selector
Knob (conventional mode)
2 LED Indicator 9 Down Key
3 LCD Display 10 Speaker
4 OK/Menu Key 11
Answer/Redial/Call Key (trunking
mode)
Programmable Key (conventional
mode)
5
Back/Group Call Management
Key 12 Programmable Keys

Product Controls
Service Manual
4
No. Part Name No. Part Name
6
Dial-
back/End/Home Screen Key
(trunking mode) 13 Microphone Jack
Programmable Key (conventional
mode)
7 Power On/Off Key 14 Microphone Installation Index
Rear Panel
No. Part Name No. Part Name
1 RF Antenna Connector 3 Power Inlet
2 Accessory Jack 4 GPS Antenna Connector
Note
The GPSAntenna Connector is only available for MD78XG.

Service Manual
Front Panel Section
5
3. Front Panel Section
The front panel contains the speaker, keys, power switch, volume control knob, LCD display and other
parts. The block diagram is shown as the figure below.
Figure 3-1 Diagram of Front Panel
Power Supply
The main board supplies power to the front panel via U902, so that the LED, backlight and USB
devices can be powered up. Then the power is further fed to U5, so as to supply LCD and U1
(serial-to-parallel converter IC).
Keys
The front panel has ten keys whose functions vary with different operation modes, as described in the
table below. The operation of each key is identified by a 3X4 matrix keyboard.

Front Panel Section
Service Manual
6
Key Conventional Mode Trunking Mode
Programmable Key S2, S3, S7, S8, S9, S10
and S12
S3, S7, S9, S10 and
S12
Up/Down Key S5 and S11
OK/Menu Key S4
Back Key S6
Power On/Off Key S1
Dial-
back/End/Home Screen
Key / S2
Answer/Redial/Call Key / S8
LCD Display
The TFT LCD transfers data via the bus EMIFS of U302. The control signals contain write/read enable,
memory chip select, LCD chip select and reset signal, each of which is pulled up by R36, R35, R34,
R33 and R6 respectively. The 5V voltage is converted to 3.3V by U5, in order to supply the LCD
module.
LED and Backlight
The LED enable signal is fed to the serial-to-parallel converter IC, and then is output by U302. RX
status is indicated by green LED, and TX status by red LED. Backlight is activated upon any key press.
The LEDs (red and green) in series are supplied by a 5V voltage (U902) and controlled by Q2 and Q3.
The backlight is also supplied by a 5V voltage and controlled by Q1. Control signals are output via U1.
MMC
For details, please refer to Interface Definition.
Audio output
The front panel provides two audio outputs: Handset_audio and SPK±. Handset_audio is the output of
received audio via MMC, and SPK± is the output by the audio PA (U201) as audio signal for the front
panel speaker.
Volume Control
The volume control is facilitated by the encoder switch (U7), which generates signals to be fed to U302
by GPIO17 and GPIO18.

Service Manual
Baseband Section
7
4. Baseband Section
4.1 Power Section
Q920\Q921\U914
Q804\Q805
Q801 Q801
Q902
U703
U702
Q6102
Q6103
U6000
9V3A 9V1A
9V1A
5VA
Q6105
U701
U701
U915
U918
Q104 Q100\Q103\Q106\Q110
5VA
4V3A
U100
X100
3V3A
3VRTC
1V6D
5VD Accessory Level
Translator
Option board
U401 USB
U902
U302
U900 U302
U233
U910
U231
U232
U302
1V8D
U326
J400
U323
U326
Control Head
U912
3V3DP
U919
U913
U903
U901
3V3D
Auto baterry Voltage
13.6±15%
ON\OFF KEY PWB
IGN_SENCE
EMERGENCY
Q802\Q803\U201
U905
5VA
U500
U909 U231
X302
3V3A
Figure 4-1 Diagram of Power Distribution
Both the baseband control IC and the RF section can convert the supplied voltage to an appropriate
one via the voltage converter.
Supply for RF: U914, Q920 and Q921 supply power for the RF section by high current PNP transistor
and comparator, which can work as LDO (Low Dropout Regulator).
Supply for FGU: U918 and U915 supply 3.3V and 5V respectively to U100.