Hytera PD70X Series User manual

数字手持对讲机
DMR PORTABLE RADIO
SERVICE MANUAL
维修手册

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:
PD70X (X may indicate 2, 5, 6 or 8)
PD70XG (X may indicate 2, 5, 6 or 8)
PD78X (X may indicate 2, 5, 6 or 8)
PD78XG (X may indicate 2, 5, 6 or 8)
HD705
HD705G
HD785
HD785G
In this manual, the description related to the LCD is applicable to PD78X/ PD78XG/ HD785/ HD785G
only, while the description related to GPS is applicable to PD70XG/ PD78XG/ HD705G/ HD785G only.

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Contents
1. Revision History ................................................................................................................................... 1
2. Copyright Information.......................................................................................................................... 2
3. Disclaimer ............................................................................................................................................. 3
4. Introduction........................................................................................................................................... 4
5. Product Controls .................................................................................................................................. 5
6. Baseband Section ................................................................................................................................ 7
6.1 Power Section............................................................................................................................... 7
6.2 Control Section.............................................................................................................................. 8
6.3 Audio Section.............................................................................................................................. 14
6.4 Troubleshooting Flow Chart........................................................................................................16
6.5 PCB Difference ........................................................................................................................... 17
7. GPS Circuit.......................................................................................................................................... 18
7.1 Circuit Description.......................................................................................................................18
7.2 Schematic Diagram.....................................................................................................................19
7.3 Parts List ..................................................................................................................................... 20
7.4 Troubleshooting Flow Chart........................................................................................................21
8. Tuning Description............................................................................................................................. 22
9. Interface Definition............................................................................................................................. 23
10. UHF1 (400-470MHz) Information..................................................................................................... 27
10.1 Transmitter Circuit.....................................................................................................................27
10.2 Receiver Circuit.........................................................................................................................28
10.3 Frequency Generation Unit (FGU)............................................................................................30
10.4 PCB View..................................................................................................................................32
10.5 Block Diagram...........................................................................................................................40
10.6 Schematic Diagram...................................................................................................................43
10.7 Parts List................................................................................................................................... 59
10.8 Troubleshooting Flow Chart......................................................................................................84
11. UHF2 (450-520MHz) Information ..................................................................................................... 90
11.1 Transmitter Circuit.....................................................................................................................90

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11.2 Receiver Circuit.........................................................................................................................91
11.3 Frequency Generation Unit (FGU)............................................................................................93
11.4 PCB View ..................................................................................................................................95
11.5 Block Diagram.........................................................................................................................103
11.6 Schematic Diagram.................................................................................................................106
11.7 Parts List..................................................................................................................................122
11.8 Troubleshooting Flow Chart....................................................................................................147
12. UHF3 (350-400MHz) Information................................................................................................... 154
12.1 Transmitter Circuit...................................................................................................................154
12.2 Receiver Circuit.......................................................................................................................155
12.3 Frequency Generation Unit (FGU)..........................................................................................157
12.4 PCB View................................................................................................................................159
12.5 Block Diagram.........................................................................................................................167
12.6 Schematic Diagram.................................................................................................................170
12.7 Parts List.................................................................................................................................186
12.8 Troubleshooting Flow Chart....................................................................................................212
13. VHF (136-174MHz) Information ..................................................................................................... 218
13.1 Transmitter Circuit...................................................................................................................218
13.2 Receiver Circuit.......................................................................................................................219
13.3 Frequency Generation Unit (FGU)..........................................................................................221
13.4 PCB View................................................................................................................................223
13.5 Block Diagram.........................................................................................................................231
13.6 Schematic Diagram.................................................................................................................234
13.7 Parts List.................................................................................................................................250
13.8 Troubleshooting Flow Chart....................................................................................................277
14. Disassembly and Assembly.......................................................................................................... 283
15. Exploded View ................................................................................................................................ 285
16. Packing Guide ................................................................................................................................ 289
17. Specifications ................................................................................................................................. 290
18. Appendix ......................................................................................................................................... 292

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1. Revision History
Version Date Description
R2.0 09-2010 Initial Release
R3.5 05-2011 Add descriptions on VHF, UHF2 and UHF3; update the battery
life.

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2. 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 Nos. #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.

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3. 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.
If you have any suggestions or would like to learn more details, please visit our website at:
http://www.hytera.com.

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4. Introduction
Intended User
This manual is intended for use by qualified technicians only.

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5. Product Controls
PD70X/ PD70XG/ HD705/ HD705G
No. Part Name No. Part Name
○
1SK1 (Side Key 1) ○ 8Radio On-Off/Volume Control Knob
○
2PTT Key ○ 9Microphone
○
3SK2 (Side Key 2) ○
10 Accessory Jack
○
4TK (Top Key) ○
11 Battery Latch
○
5Channel Selector knob ○
12 Antenna
○
6Speaker ○
13 Belt Clip
○
7LED Indicator ○
14 Battery

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PD78X/ PD78XG/ HD785/ HD785G
No. Part Name No. Part Name
○
1SK1 (Side Key 1) ○
11 LED Indicator
○
2 PTT Key ○
12 Antenna
○
3SK2 (Side Key 2) ○
13 Radio On-Off/Volume Control Knob
○
4TK (Top Key) ○
14 Accessory Jack
○
5Channel Selector knob ○
15 Exit Key
○
6Microphone ○
16 Up Key
○
7LCD Display ○
17 Down Key
○
8OK/Menu Key ○
18 Battery Latch
○
9Speaker ○
19 Belt Clip
○
10 Numeric Keypad ○ 20 Battery

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6. Baseband Section
6.1 Power Section
6.1.1 Diagram of Power Control
Figure 6-1 Diagram of Power Control
6.1.2 Radio On/Off
Figure 6-2 Diagram of Radio On/Off Control
The radio-on signal (POWER-SW+) satisfies the equation: POWER-SW+= PWR-SW- | POWER-CTL.
When the Volume Switch is on, PWR-SW- and POWER-SW+ are at high level, and the radio powers up.

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After power-on, POWER-CTL goes to high level, and POWER-KEY-DET goes to low level. During
power-off, POWER-SW+ is at low level, while POWER-KEY-DET is at high level. The system detects
power-off procedure via POWER-KEY-DET and implements the power-off procedure. Then
POWER-KEY-DET and POWER-SW+ go to low level, and the power is cut off.
6.1.3 Power Protection
Power protection includes over-current, reverse-voltage and ESD protection.
6.1.4 Power Consumption Control
OMAP can control and configure the power supply and working mode of the peripheral modules (RF
section and baseband section) via I/O interface and serial bus, so as to reduce power consumption.
6.2 Control Section
6.2.1 OMAP5912 Dual-core Processor
The radio uses the dual-core processor OMAP5912, which is mainly composed of ARM926EJ-S and
TMS320C55xx. ARM926EJ-S is the main controller, while TMS320C55xx is used for
modulation/demodulation and voice encoding/decoding.
Figure 6-3 Diagram of OMAP5912

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Figure 6-4 Diagram of Overall Scheme
6.2.2 External Memory
OMAP5912 provides two types of external memory interfaces: external memory interface slow (EMIFS)
and external memory interface fast (EMIFF).
OMAP5912
EMIFF EMIFS
SDRAM.A[0:12] FLASH.A[24:1]
SDRAM.D[0:15] FLASH.A[15:0]
SDRAM.BA0
SDRAM.BA1
SDRAM.CAS# FLASH.CS3#
SDRAM.RAS# RST_OUT#
SDRAM.CKE#
SDRAM.CLK#
SDRAM.CS#
SDRAM.WE#
SDRAM.DQML
SDRAM.DQMU
A[0:12]
D[0:15]
BA0
BA1
CAS#
RAS#
CKE
CLK
CS#
WE#
LDQM
ULQM
TV00570002CDGB
A[23:0]
DQ[15:0]
OE#
WE#
Cef#
RESET#
WP#/ACC
RY/Byf#
FLASH.WP#
FLASH.RDY
FLASH.OE#
FLASH.WE#
MT48H8M16LFB4-75
Figure 6-5 Diagram of External Memory
1) EMIFS
EMIFS is a 16-bit interface, and provides four 64MB chip selects (CS0~CS3). The interface supports

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memories such as NAND Flash, NOR Flash and SRAM.
2) EMIFF
EMIFF is a 16-bit interface, and supports SDRAM (up to 128MB), mobile SDRAM and mobile DDR.
6.2.3 Clock
X201
32.768KHz
1 2
20pF 20pF
APLL
ULPD
96MHz
DPLL1
OSC32K_OUT
OSC32K_IN
OSC1_OUT
OSC1_IN
CK_REF
19.2MHz
ARM_CK
DSP_CK
TC_CK
MCLK
BCLK
CLK_32K_OUT
OMAP3.2
ULPD_PLL_CLK
OMAP5912
TLV320AIC29
19.2MHz
MCLK
Option board
CLK-OPT
CLK-32K-OUT
U201
U821
19.2MHz
32kHz
CLK32K_IN
VSS(Y13)
VCC
VCC
OUT
VCONT
GND
X203
TCXO 19.2MHz
1
2 3
4
Figure 6-6 Diagram of Baseband Clock
Input Clock:
(A) 32K Clock: It is also called “sleep clock” and is mainly used for timing and sleeping of the system.
(B) 19.2MHz Clock: It is mainly used to provide input clock for APLL and DPLL.
Output Clock:
Three output clocks are provided: MCLK, BCLK and CLK32K_OUT. MCLK provides 19.2MHz clock to
the audio codec; BCLK provides 19.2MHz clock to the option board; and CLK32K_OUT provides 32KHz
clock to the option board.
6.2.4 Reset Signal
Figure 6-7 Diagram of Reset Signal

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6.2.5 SPI
OMAP5912 has a SPI, which has four chip-selects for connecting four external SPI components. The
SPI signals available are SPI.DOUT, SPI.DIN, SPI.CLK and SPI.CS. The system uses SPIF.CS2 to
select the IF processor AD9864, to configure register of AD9864. The connection of SPI is shown below.
U201
OMAP5912
SPIF.CS2(T19)
SPIF.SCK(U19)
SPIF.DOUT(W21)
SPIF.DIN(U18)
PEA
D9864 PC
PD
DOUTB
PE
AD9864 PC
PD
DOUTB
Figure 6-8 Diagram of SPI Connection
6.2.6 MCBSP
OMAP5912 provides 3 MCBSP interfaces: MCBSP1, MCBSP2 and MCBSP3. MCBSP1 is connected
with the I2S interface of the audio codec, to realize two-way transmission of digital voice and data.
MCBSP2 uses independent clock and frame synchronization for transmission and reception. AD9864
SSI is connected to the RX end of OMAP5912 MCBSP2. AD9864 works in master mode, while DSP
works in slave mode. DAC is connected with the TX end of MCBSP2, and DSP works in master mode.
MCBSP3 is connected to the option board. The connection of MCBSP is shown below.

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Figure 6-9 Diagram of MCBSP Connection
6.2.7 USB
OMAP5912 provides 3 USB interfaces. One interface integrates a USB transceiver, which is connected
to the accessory jack and is used for program downloading and data application.
Figure 6-10 Diagram of USB Interface
6.2.8 UART
OMAP5912 has three UART interfaces (UART1, UART2 and UART3), and supports hardware flow
control. The maximum communication rate is 1.5Mbps. The connection of UART is shown below. UART1
is connected with the accessory jack, and is used for updating and programming. UART2 is for GPS,
and UART3 is for the option board.
Figure 6-11 Diagram of UART Interface Connection

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6.2.9 I2C
OMAP5912 provides one I2C interface, and supports communication rate up to 400Kbps. The I2C
interface is connected with the acceleration sensor, and works in slave mode. The connection of I2C is
shown below.
Figure 6-12 Diagram of I2C Connection
6.2.10 MICROWIRE
OMAP5912 provides a MICROWIRE. The four chip select signals can drive four external components.
MICROWIRE is used to configure the audio codec and read the value of its register. It uses the chip
select signal 3. The connection is shown below.
Figure 6-13 Diagram of MICROWIRE Connection
6.2.11 MCSI1
OMAP5912 has two MCSI interfaces. MCSI1 is used for PLL configuration and data transmission. The
connection of MCSI1 is shown below.
Figure 6-14 Diagram of SPI Connection

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6.3 Audio Section
6.3.1 Audio Diagram
The audio module is mainly for audio input and output. TLV320AIC29 is used as the audio codec to
convert and process audio signal and digital signal. The audio amplifier TDA8547TS is used to amplify
the analog audio signal. DSP processes digital signal (audio signal encoding/decoding, digital I/Q signal
decoding, digital audio signal processing). AD9864 converts and processes the RF IF signal, and sends
the undemodulated serial digital I/Q signal to the DSP for processing. Then DAC5614 converts the digital
signal output by DSP to analog signal.
Figure 6-15 Diagram of Audio Section
6.3.2 Diagram of Signal Flow
The microphone converts the audio signal into electrical signal, which is then amplified by PGA of the
codec and sent to ADC of the codec for sampling. After digital audio processing, the signal is output to
DSP for processing. Then the signal is sent to DAC (TLV5614), which converts the signal to modulation
signal.After modulated and amplified in the RF module, the signal is sent out from the antenna.
The RF signal received by the RF module is converted to digital signal by ADC (AD9864), and is then

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sent to DSP for demodulation and processing. Then the digital signal is sent to the digital audio
processor of the codec for digital audio processing, and is then converted into analog audio signal by
DAC of the codec. Finally the signal is amplified by the external audio amplifier (TDA8547TS) to drive
the speaker.
OMAP5912
Audio is processed via DSP.
UWIRE.SCLK
UWIRE.CS3
UWIRE.SDO
UWIRE.SDI
MCLK
MCBSP1.DR
MCBSP1.FSX
MCBSP1.DX
MCBSP1.CLKX
TLV5604
DAC
AD9864
MCBSP2.DX DIN
DOUTA
MCBSP2.DR
RF TX
RF RX
Internal/
external MIC input
APA
TDA8547TS
Gain: 31dB
Internal/external speaker
output
RX
TX
MIC
gain:
22dB TX TX
RX RX
Figure 6-16 Diagram ofAudio Signal Flow
6.3.3 Audio Amplifier
Main parameters of TDA8547TS are listed in the table below:
Rated Power (Po) 0.5W RL =16
Ω
Maximum Power (Pmax) 1.2W RL =16
Ω
The operation status of the audio amplifier is controlled via GPIO of OMAP. See the table below.
Mode-Amp SEL-SPK MODE SELECT OUT
1 1 0 0 OUT2
1 0 0 1 OUT1
0 1 1 1 Standby

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6.4 Troubleshooting Flow Chart
The GPS module
outputs normally?[1]
Check the power
supply.
The channel from GPS to
OAMP is normal?
GPS PIN17 outputs 2.8V voltage?
Replace abnormal RC and
check OMAP.
Replace the
GPS module.
Replace U501.
Replace Z501.
No
Yes
Yes
No
Yes Yes
No
No
Yes
No
No
L506 outputs 2.8V
voltage?
U501 is normal?[3]
Z501 is normal?[4]
Replace the GPS
module.
The power supply for GPS is
normal?[2]
Yes
No
Description of Normal Situations:
[1] The radio shows normal power-on screen, and the backlight is normal.
[2] The RF power supply outputs normally, and the RX channel is on.
[3] Vpp: 700mV~800mV, F: 19.2MHz.