Hytera PD70X Series User 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 GPS is applicable to PD70XG/ PD78XG/ HD705G/ HD785G
only, while the description related to the LCD is applicable to PD78X/ PD78XG/ HD785/ HD785G.

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.
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. 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 MCBSP...............................................................................................................................11
3.2.7 USB ....................................................................................................................................12
3.2.8 UART..................................................................................................................................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 Circuit .......................................................................................................................................19
4.1 Circuit Description.........................................................................................................................19
4.2 Schematic Diagram.......................................................................................................................20
4.3 Parts List.......................................................................................................................................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

Contents Service Manual
ii
7.1.1 RF Power Amplifier Circuit..................................................................................................32
7.1.2 Low-pass Filter Circuit ........................................................................................................33
7.1.3 Auto Power Control Circuit..................................................................................................33
7.2 Receiver Circuit.............................................................................................................................33
7.2.1 Receiver Front-end .............................................................................................................34
7.2.2 Receiver Back-end .............................................................................................................35
7.3 Frequency Generation Unit (FGU) ................................................................................................35
7.3.1 Working Principle of PLL.....................................................................................................36
7.3.2 Working Principle of VCO ...................................................................................................37
7.3.3 Two-point Modulation..........................................................................................................37
7.4 PCB View......................................................................................................................................38
7.5 Block Diagram ..............................................................................................................................46
7.6 Schematic Diagram.......................................................................................................................49
7.7 Parts List.......................................................................................................................................65
7.8 Troubleshooting Flow Chart........................................................................................................115
8. UHF2 (450-520MHz) Information ...................................................................................................121
8.1 Transmitter Circuit.......................................................................................................................121
8.1.1 RF Power Amplifier Circuit................................................................................................121
8.1.2 Low-pass Filter Circuit ......................................................................................................122
8.1.3 Auto Power Control Circuit................................................................................................122
8.2 Receiver Circuit...........................................................................................................................122
8.2.1 Receiver Front-end ...........................................................................................................123
8.2.2 Receiver Back-end ...........................................................................................................124
8.3 Frequency Generation Unit (FGU) ..............................................................................................124
8.3.1 Working Principle of PLL...................................................................................................125
8.3.2 Working Principle of VCO .................................................................................................125
8.3.3 Two-point Modulation........................................................................................................126
8.4 PCB View....................................................................................................................................127
8.5 Block Diagram ............................................................................................................................135
8.6 Schematic Diagram.....................................................................................................................138
8.7 Parts List.....................................................................................................................................154
8.8 Troubleshooting Flow Chart........................................................................................................205
9. UHF3 (350-400MHz) Information ...................................................................................................211
9.1 Transmitter Circuit.......................................................................................................................211
9.1.1 RF Power Amplifier Circuit................................................................................................211
9.1.2 Low-pass Filter Circuit ......................................................................................................212
9.1.3 Auto Power Control Circuit................................................................................................212
9.2 Receiver Circuit...........................................................................................................................212

Service Manual Contents
iii
9.2.1 Receiver Front-end ...........................................................................................................213
9.2.2 Receiver Back-end ...........................................................................................................214
9.3 Frequency Generation Unit (FGU) ..............................................................................................214
9.3.1 Working Principle of PLL...................................................................................................215
9.3.2 Working Principle of VCO .................................................................................................215
9.3.3 Two-point Modulation........................................................................................................216
9.4 PCB View....................................................................................................................................217
9.5 Block Diagram ............................................................................................................................225
9.6 Schematic Diagram.....................................................................................................................228
9.7 Parts List.....................................................................................................................................244
9.8 Troubleshooting Flow Chart........................................................................................................295
10. UHF5 (806-941MHz) Information..................................................................................................301
10.1 Transmitter Circuit.....................................................................................................................301
10.1.1 RF Power Amplifier Circuit ..............................................................................................301
10.1.2 Low-pass Filter Circuit ....................................................................................................302
10.1.3 Auto Power Control Circuit..............................................................................................302
10.2 Receiver Circuit.........................................................................................................................302
10.2.1 Receiver Front-end .........................................................................................................303
10.2.2 Receiver Back-end .........................................................................................................304
10.3 Frequency Generation Unit (FGU) ............................................................................................304
10.3.1 Working Principle of PLL.................................................................................................305
10.3.2 Working Principle of VCO ...............................................................................................305
10.3.3 Two-point Modulation......................................................................................................306
10.4 PCB View..................................................................................................................................307
10.5 Block Diagram ..........................................................................................................................315
10.6 Schematic Diagram...................................................................................................................318
10.7 Parts List...................................................................................................................................334
10.8 Troubleshooting Flow Chart......................................................................................................388
11. VHF (136-174MHz) Information....................................................................................................396
11.1 Transmitter Circuit.....................................................................................................................396
11.1.1 RF Power Amplifier Circuit ..............................................................................................396
11.1.2 Low-pass Filter Circuit.....................................................................................................397
11.1.3 Auto Power Control Circuit ..............................................................................................397
11.2 Receiver Circuit.........................................................................................................................397
11.2.1 Receiver Front-end .........................................................................................................398
11.2.2 Receiver Back-end..........................................................................................................399
11.3 Frequency Generation Unit (FGU) ............................................................................................399
11.3.1 Working Principle of PLL.................................................................................................400

Contents Service Manual
iv
11.3.2 Working Principle of VCO ...............................................................................................400
11.3.3 Direct Modulation ............................................................................................................401
11.4 PCB View..................................................................................................................................402
11.5 Block Diagram ..........................................................................................................................410
11.6 Schematic Diagram...................................................................................................................413
11.7 Parts List...................................................................................................................................429
11.8 Troubleshooting Flow Chart......................................................................................................482
12. Disassembly and Assembly ........................................................................................................488
12.1 Disassembling the Chassis.......................................................................................................488
12.2 Disassembling the TX and RX Units .........................................................................................488
12.3 Assembly ..................................................................................................................................489
13. Exploded View ..............................................................................................................................490
14. Packing Guide ..............................................................................................................................496
15. Specifications ...............................................................................................................................497
16. Appendix .......................................................................................................................................500

Service Manual Figures
v
Figures
Figure 3-1 Diagram of Power Control.......................................................................................................6
Figure 3-2 Diagram of Radio On/Off Control ............................................................................................6
Figure 3-3 Diagram of OMAP5912 ...........................................................................................................8
Figure 3-4 Diagram of Overall Scheme ....................................................................................................8
Figure 3-5 Diagram of External Memory...................................................................................................9
Figure 3-6 Diagram of Baseband Clock..................................................................................................10
Figure 3-7 Diagram of Reset Signal .......................................................................................................11
Figure 3-8 Diagram of SPI Connection...................................................................................................11
Figure 3-9 Diagram of MCBSP Connection............................................................................................12
Figure 3-10 Diagram of USB Interface ...................................................................................................12
Figure 3-11 Diagram of UART Interface Connection ..............................................................................13
Figure 3-12 Diagram of I2C Connection.................................................................................................13
Figure 3-13 Diagram of MICROWIRE Connection .................................................................................14
Figure 3-14 Diagram of MCSI1 Connection............................................................................................14
Figure 3-15 Diagram of Audio Section....................................................................................................15
Figure 3-16 Diagram of Audio Signal Flow .............................................................................................16
Figure 4-1 Diagram of GPS Circuit.........................................................................................................19
Figure 4-2 Schematic Diagram...............................................................................................................20
Figure 7-1 Diagram of Transmitter Circuit...............................................................................................32
Figure 7-2 Diagram of Receiver Circuit ..................................................................................................34
Figure 7-3 Diagram of IF Processor .......................................................................................................35
Figure 7-4 Diagram of FGU ....................................................................................................................36
Figure 8-1 Diagram of Transmitter Circuit.............................................................................................121
Figure 8-2 Diagram of Receiver Circuit ................................................................................................123
Figure 8-3 Diagram of IF Processor .....................................................................................................124
Figure 8-4 Diagram of FGU ..................................................................................................................125
Figure 9-1 Diagram of Transmitter Circuit.............................................................................................211
Figure 9-2 Diagram of Receiver Circuit ................................................................................................213
Figure 9-3 Diagram of IF Processor .....................................................................................................214
Figure 9-4 Diagram of FGU ..................................................................................................................215
Figure 10-1 Diagram of Transmitter Circuit...........................................................................................301
Figure 10-2 Diagram of Receiver Circuit ..............................................................................................303
Figure 10-3 Diagram of IF Processor ...................................................................................................304
Figure 10-4 Diagram of FGU ................................................................................................................305
Figure 11-1 Diagram of Transmitter Circuit...........................................................................................396
Figure 11-2 Diagram of Receiver Circuit...............................................................................................398

Figures Service Manual
vi
Figure 11-3 Diagram of IF Processor....................................................................................................399
Figure 11-4 Diagram of FGU ................................................................................................................400

Service Manual Tables
vii
Tables
Table 6-1 Definition of 50-Pin Interface ..................................................................................................27
Table 6-2 Definition of 30-Pin LCD Interface ..........................................................................................27
Table 6-3 Definition of Channel Board Interface .....................................................................................28
Table 6-4 Definition of 20-Pin Option Board Interface ............................................................................30
Table 6-5 Definition of 16-Pin Accessory Interface .................................................................................30
Table 6-6 Definition of Accessory Identifiers...........................................................................................31
Table 16-1 UHF1 Blind Spot .................................................................................................................501
Table 16-2 UHF2 Blind Spot .................................................................................................................501
Table 16-3 UHF3 Blind Spot .................................................................................................................502
Table 16-5 VHF Blind Spot ...................................................................................................................502

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 injury.
Danger Indicates situations that could cause major 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 battery life.
Update the template.
Add appropriate trunking information.
R4.5 April 10th, 2012
Add descriptions on UHF5.
Update unclear diagrams.
Add print No. for some 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
PD70X/ PD70XG/ HD705/ HD705G
No. Part Name No. Part Name
1 SK1 (Side Key 1) 8 Radio On-Off/Volume Control Knob
2 PTT Key 9 Microphone
3 SK2 (Side Key 2) 10 Accessory Jack
4 TK (Top Key) 11 Battery Latch
5 Channel Selector Knob 12 Antenna
6 Speaker 13 Belt Clip
7 LED Indicator 14 Battery

Product Controls Service Manual
4
PD78X/ PD78XG/ HD785/ HD785G
No. Part Name No. Part Name
1 SK1 (Side Key 1) 12 LED Indicator
2 PTT Key 13 Antenna
3 SK2 (Side Key 2) 14
Radio On-Off/Volume Control
Knob
4 TK (Top Key) 15 Accessory Jack
Group Call Selector Knob
(trunking mode)
5
Volume Control/Channel
Selector Knob (conventional
mode)
16
Back/Group Call Management
Key

Service Manual Product Controls
5
No. Part Name No. Part Name
Dial-back/End/Home Screen
Key (trunking mode)
6 Microphone 17
Programmable Key
(conventional mode)
7 LCD Display 18 Up Key
8 OK/Menu Key 19 Down Key
Answer/Redial/Call Key
(trunking mode)
9
Programmable Key
(conventional mode)
20 Battery Latch
10 Speaker 21 Belt Clip
11 Numeric Keypad 22 Battery

Baseband Section Service Manual
6
3. Baseband Section
3.1 Power Section
3.1.1 Diagram of Power Control
Figure 3-1 Diagram of Power Control
3.1.2 Radio On/Off
Figure 3-2 Diagram of Radio On/Off Control
The radio-on signal (POWER-SW+) satisfies the equation: POWER-SW+= PWR-SW- | POWER-CTL.

Service Manual Baseband Section
7
When the Volume Switch is on, PWR-SW- and POWER-SW+ are at high level, and the radio powers
up. 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.
3.1.3 Power Protection
Power protection includes over-current, reverse-voltage and ESD protection.
3.1.4 Power Consumption Control
OMAP can control and configure the power supply and working mode of the peripheral modules (RF
section and baseband section) via the I/O interface and serial bus, so as to reduce power
consumption.
3.2 Control Section
3.2.1 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.

Baseband Section Service Manual
8
Figure 3-3 Diagram of OMAP5912
Figure 3-4 Diagram of Overall Scheme

Service Manual Baseband Section
9
3.2.2 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 3-5 Diagram of External Memory
EMIFS
EMIFS is a 16-bit interface, and provides four 64MB chip selects (CS0~CS3). The interface supports
memories such as NAND Flash, NOR Flash and SRAM.
EMIFF
EMIFF is a 16-bit interface, and supports SDRAM (up to 128MB), mobile SDRAM and mobile DDR.

Baseband Section Service Manual
10
3.2.3 Clock
X20 1
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
X20 3
TCXO 19.2MHz
1
2 3
4
Figure 3-6 Diagram of Baseband Clock
Input Clock
32K Clock: It is also called “sleep clock” and is mainly used for timing and sleeping of the system.
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 32
KHz clock to the option board.