Hytera PNC370 User manual

PNC370 Smart LTE Terminal

Preface
This manual describes the information related to the product repair. It is intended for use by qualified
technicians only. To repair the product properly, please read this manual carefully before repairing.
This manual is applicable to the following product:
PNC370 PoC Terminal

Copyright Information
Hytera is the trademark or registered trademark of Hytera Communications Corporation Limited (the
Company) in the People's Republic of China (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. 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.
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 technological development. No part of this manual may be copied, modified, translated, or
distributed in any manner without the prior written consent of the Company.
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 receive more information, please visit our website at:
http://www.hytera.com.

Revision History
Version Release Date Description
V00 May 2019 Initial release.
Documentation Information
Conventions
Instructional Conventions
Icon Description
Indicates information that can help you make better use of your product.
Indicates references that can further describe the related topics.
Indicates situations that could cause data loss or equipment damage.
Indicates situations that could cause minor personal injury.
Indicates situations that could cause major personal injury or even death.
Notational Conventions
Convention Description
“ ”
The quotation marks enclose the name of a software interface element. For
example, click “OK”.
Bold The text in boldface denotes the name of a hardware button. For example, press the
PTT key.
->
The symbol directs you to access a multi-level menu. For example, to select “New”
from the “File” menu, we will describe it as follows: “File -> New”.

Service Manual
Contents
i
Contents
1. Product Layout...................................................................................................................................... 1
2. Disassembly and Reassembly ............................................................................................................. 2
2.1 Tools.................................................................................................................................................. 2
2.2 Procedures ........................................................................................................................................ 2
3. Exploded View and Packaging Guide.................................................................................................. 4
3.1 Exploded View................................................................................................................................... 4
3.2 Packaging Guide ............................................................................................................................... 6
4. Specifications ........................................................................................................................................ 7
5. Circuit Description ................................................................................................................................ 9
5.1 Baseband Section.............................................................................................................................. 9
5.1.1 Control Module ........................................................................................................................ 9
5.1.2 Audio and Peripheral Module..................................................................................................11
5.2 RF Section ....................................................................................................................................... 12
5.2.1 Communication Mode............................................................................................................ 12
5.2.2 TX Circuit............................................................................................................................... 12
5.2.3 Main Receiving Circuit ........................................................................................................... 13
5.2.4 Diversity Receiving Circuit ..................................................................................................... 13
5.2.5 GNSS/WLAN/BT Circuit ........................................................................................................ 13
6. Circuit Inspection ................................................................................................................................ 15
6.1 Baseband Section............................................................................................................................ 15
6.1.1 Downloading Failed ............................................................................................................... 15
6.1.2 Powering On Failed ............................................................................................................... 15
6.1.3 Lighting Up Screen Failed ..................................................................................................... 16
6.1.4 Charging Status Displaying Failed......................................................................................... 16
6.1.5 Turning On Backlight/Flashlight Failed .................................................................................. 17
6.1.6 Speaker/Microphone Failed to Output/Input Audio ................................................................ 17
6.1.7 Keypad Failed to Respond .................................................................................................... 18
6.1.8 SIM Card Failed to Be Detected ............................................................................................ 18
6.2 RF Section ....................................................................................................................................... 19
6.2.1 Calibration Totally Failed........................................................................................................ 19
6.2.2 XO Calibration Failed ............................................................................................................ 19
6.2.3 Calibration Partly Failed ........................................................................................................ 19
6.3 Wi-Fi Section ................................................................................................................................... 20
6.3.1 Connecting to Wi-Fi Networks Failed .................................................................................... 20
6.3.2 Poor Wi-Fi Network Performance .......................................................................................... 20
7. Interface Details .................................................................................................................................. 21
8. Tuning Description.............................................................................................................................. 22

Contents
Service Manual
ii
8.1 Installing Driver ................................................................................................................................ 22
8.2 Upgrading Software ......................................................................................................................... 22
8.2.1 Preparation ............................................................................................................................ 22
8.2.2 Procedure .............................................................................................................................. 22
8.3 Testing the Radio............................................................................................................................. 24
8.3.1 Preparation ............................................................................................................................ 24
8.3.2 Procedure .............................................................................................................................. 24
8.3.3 Judgement Standard for Test Items ....................................................................................... 25
8.3.4 Hiding the Test App................................................................................................................ 26
9. Block Diagram ..................................................................................................................................... 27
9.1 Baseband Section............................................................................................................................ 27
9.2 RF Section ....................................................................................................................................... 28
10. Part List.............................................................................................................................................. 29

Service Manual
Product Layout
1
1. Product Layout

Disassembly and Reassembly
Service Manual
2
2. Disassembly and Reassembly
This chapter describes how to disassemble the radio. To reassemble the radio, do vice versa.
When reassembling the terminal, make sure that the waterproof ring is evenly inserted into the
original position to ensure the waterproof performance of the terminal.
2.1 Tools
Phillips screwdriver
T8 screwdriver
Needle-nose pliers
Tweezers
2.2 Procedures
1. Use a Phillips screwdriver to remove the two screws fixing the belt clip, and then remove the belt clip.
2. Slide the battery latch to the position, and then remove the battery cover.
3. Lift the bottom of the battery to remove the battery from the radio.
4. Remove the chassis as follows:

Service Manual
Disassembly and Reassembly
3
a. Use a T8 screwdriver to remove the four screws on the chassis.
b. Use a tweezer to remove the FPC connector between the chassis and main board.
c. Remove the chassis.
5. Remove the main board as follows:
a. Use a Phillips screwdriver to remove the four screws on the main board.
b. Remove the four FPC connectors on the main board.
c. Remove the main board.
6. Use the needle-nose pliers to straighten the four clips and remove the screen holder and screen.

Exploded View and Packaging Guide
Service Manual
4
3. Exploded View and Packaging Guide
3.1 Exploded View
The table below lists the parts.
No. Part No. Description Qty No. Part No. Description Qty
1 5113010000352A Protective film for
lens 1
27 5113050000345A Preloaded foam for
battery cover 2
2 5110990000021A Light guide 1 28 5116000000243A Battery Latch 1
3 5116000002477A LED Cover 1
29 5116000000480A Slider for battery latch 1
4 5116000002578A LCD lens 1 30 5116000001552A Stopper for accessory
connector cover 2
5 5116000002472A PTT key bracket 1 31 5110000000607A Waterproof ring 1
6 5116000002473A PTT key cover 1
32 5107000000234A Machine screw 4
7 5110020000013A PTT key 1 33 32010000000227 Li-ion battery 1
8 5116000002470A Front housing 1 34 5116000002471A Chassis 1
9 5113070000150A Double-sided tape
for GPS antenna 1
35 / Main board 1
10 / FPC for flashlight 1 36 50151100000041 Diversity antenna 1
11 5113050000344A Buffer foam for LCD 1 37 5113050000346A Preloaded foam for
speaker 1
12 50151100000039 GPS/WIFI/BT
antenna 1
38 51020600000125 Speaker 1

Service Manual
Exploded View and Packaging Guide
5
No. Part No. Description Qty No. Part No. Description Qty
13 5116000001101A Convex lens 1 39 51020200000053 Microphone 2
14 5115020000048A
Grounded
conductive foam for
LCD
1
40 5110000000033A Silicone MIC cover 2
15 5113010000351A PC plate for
earpiece jack 1
41 5113030000026A Waterproof MIC mesh 2
16 5110010000019A
Silicone rubber
cover for battery
connector
2 42 5111000002116A Left charging piece 1
17 50100200000048 LCD Display 1
43 5113040000197A Speaker felt 1
18 5115020000046A
Grounded
conductive foam for
speaker
1 44 5115020000047A Grounded conductive
foam for key 2
19 50151100000040 LDS main antenna 1 45 5111000002117A Right charging piece 1
20 5113070000149A Double-sided tape
for main antenna 1
46 5116000000841A USB connector cover 1
21 5113030000004A Waterproof and
breathable film 1
47 5116000001582A Accessory connector
cover 1
22 5110010000018A
Silicone rubber
cover for micro SIM
card
1 48 5107000000507B Machine screw 2
23 5110030000014A Waterproof ring for
battery cover 1
49 / Key FPC 1
24 5107000000157A Self-tapping screw 4 50 5113070000151A Double-sided tape for
LENS 1
25 5107000000051A Machine screw 2 51 5112010000112A Metal dome 1
26 5116000002474A Battery cover 1
52 5116000002484A P&R key 1
The part number is subject to change without notice due to product upgrade.

Exploded View and Packaging Guide
Service Manual
6
3.2 Packaging Guide

Service Manual
Specifications
7
4. Specifications
General
Operating system Android 5.1
CPU Qualcomm MSM8909, 1.1 GHz
Storage 4 GB ROM and 512 MB RAM
Dimensions (H x W x D) (with standard
battery)
121 mm x 55.5 mm x 24 mm
Weight (with standard battery) 185 g
Display
Size: 2.0 inch
Resolution: 320 x 240
Color screen
Battery 3100 mAh Li-Ion battery
Battery Life (5-5-90 Duty Cycle) >20 h
Charge Mode Desktop charger or multi-unit charger
Operating Voltage 3.3-4.2 V
Micro-SIM Card
Size: 12 mm x 15 mm
Quantity: 1
Accessory Port
USB 2.0
Audio connector: 2.5 mm
Charging port
Audio
Microphone
Quantity: 2
Noise reduction
Speaker
Quantity: 1
Rated power: 1 W
Network
Network All networks

Specifications
Service Manual
8
Frequency Band
GSM 900/1800 MHz
TD-SCDMA B34/B39
CDMA BC0
WCDMA B1/B8
TDD-LTE B38/B39/B40/B41
FDD-LTE B1/B3/B5/B8
LTE Protocol 3GPP
Speed Class CAT4
Wireless Module
BT BT4.1
WLAN 2.4 GHz, 802.11 b/g/n
Positioning System GPS，GLONASS，BDS
Positioning Accuracy (in the open
area)
Tracking sensitivity: < -154 dB
Time to First Fix (cold start): < 50s@–130 dBm
Time to First Fix (hot start): < 5s@–130 dBm
Recapture: < 5s@–130 dBm
Positional accuracy: < 10 m@–130 dBm
Environment
Storage Temperature -30℃to +70℃
Operating Temperature -20℃to +60℃
Wet, Shock & Vibration Protection
MIL-STD 810G
United States Military Standard
Electrostatic Discharge (ESD) IEC 61000-4-2（level 4）
±15 kV (air)
±8 kV (contact)
Water & Dust Protection IP55
All specifications are tested according to applicable standards, and subject to change without
notice due to continuous technological development.

Service Manual
Circuit Description
9
5. Circuit Description
5.1 Baseband Section
5.1.1 Control Module
Power Supply Module
User interfaces
+
LC network
-
LC network
Display
L-CR-C
network
Backlight
Flash/torch
Haptics
ERM/
LRA
Input power
management
Charger
Fuel guage
Pmux
USB
connector
LC network
Input power
management
Output power
management
SMPS circuits
LDO circuits
LC network
Load caps
PMI
PMU
External
regulators
RFFE
RF
transceivers
Modem IC,
peripherals
Audio
Wireless
connectivity
VPH_PWR
The power supply employs a 3.7 V battery. The power supply management IC consists of PMI and PMU.
PMI: It is controlled by the CPU and is responsible for powering the switch and LCD.
PMU: It is controlled by the CPU and integrates 7 DC/DCs and 23 LDOs to provide power for the
baseband section.

Circuit Description
Service Manual
10
External Memory
AP
PMU
S3
LDO5
LDO8
VREF_LPDDR
VDDPX_3
MSM_RESOUT_N
VDDPX_7
SDC1_DATA[7:0]
SDC1_CMD
SDC1_RCLK
SDC1_CLK
EBI0_CKE_0/1
EBI0_CS_N0/1
EBI0_DM[3:0]
EBI0_DQS[3:0]
EBI0_DQSB[3:0]
EBI0_CK/CKB
EBI0_CA[9:0]
EBI0_DQ[31:0]
eMMC
VCCQ
VCC
RST_N
CMD
RCLK
CLK
DAT[7:0]
CS0_N/CS1_N
CKE0/CKE1
DM[3:0]
DQS_T[3:0]
DQS_C[3:0]
CLK_T,CLK_C
CA[9:0]
DQ[31:0]
VDD2
VDD1
VDDQ
VDDCA
VREFCA/VREFDQ
ZQ0
ZQ1
VSS
VSS
1.2V
10K
1.8V
2.9V
LPDDR3
I/O Interface Description
EBI Single channel 32-bit LPDDR3 SDRAM (Dual rank)

Service Manual
Circuit Description
11
Display
AP LCD
MIPI
AP is connected to LCD (a 2.0-inch screen with resolution of 320 x 240) through MIPI.
5.1.2 Audio and Peripheral Module
Audio Module
The audio module consists of PMU and PA. The built-in CODEC of the PMU converses and processes the
voice and digital signal. The built-in audio processor of the PMU cancels noise and echo. The PA amplifies
the voice signal.
Peripheral Module
The main board consists of the circuits for peripheral module, including the earpiece jack, battery charger,
and USB connector.

Circuit Description
Service Manual
12
5.2 RF Section
RF1
RF2
RF4
RF5
RF6
RF7
RF8
RF3
A NT DRX_LB1
DRX_LB2
DRX_LB3
DRX_MB 1
DRX_MB 2
DRX_HB1
DRX_HB2
P RX _LB1
P RX _LB2
P RX _LB3
P RX _MB 1
P RX _MB 2
P RX _MB 3
P RX _HB1
P RX _HB2
TX_DA1
TX_DA2
TX_DA3
TX_DA4
TX_DA5
TX_FB R X
B20
B5
B8
B1/3
B39
B7/40
B38/41
B20
B5/850
B8/900
B34/39,1900
B3/1800
B1
B7/40
B38/41
B1/3
B5/8/20
B7/38/40/41
850/900
1800,1900,
B34/39
LB1
LB2
LB3
MB 1
MB 2
MB 3
MB 4
HB1
HB2
HB3
HBRX1
HBRX2
R FI N_VL
R FI N_L
R FI N_M
R FI N_H
TRX1
TRX2
TRX4
TRX5
TRX6
TRX7
TRX8
TRX3
A NT
LB_IN
HB_IN
PM8909
MSM8909
Tr ansce i ver
1900
B34/39
B5
B8
B20
B1
B3
B7
B40
B41(38
)
B3
B1
B20
B5
B8
B41(38
)
B40
orB7
B39
850/900
B34/39/1800/1900
C PL
A NT _1
A NT _0
VBAT
VREG_L_1P8
VREG_L18_2P7
R FFE 5_CLK
R FFE 5_D AT A
R FFE 1_CLK
R FFE 1_D AT A
SW PA
PA
5.2.1 Communication Mode
GSM and CDMA are second-generation (2G) standards. W-CDMA and CDMA BC0 are third-generation
(3G) standards. LTE is a fourth-generation standard. Only LTE supports diversity reception.
5.2.2 TX Circuit
GSM TX Circuit
The original GSM RF signal transmitted by the Transceiver goes to the switch path, and then to the PA for
amplification. Afterwards, the GSM RF signal switches to the ANT port, and then to the antenna unit.
FDD TX Circuit
Part of the original FDD RF signal transmitted by the Transceiver, goes to the switch path. Other part goes
to the PA for amplification, and then to the DUP for filtering. Afterwards, the filtered signal goes to the PA,
switches to the ANT port, and then to the antenna unit.

Service Manual
Circuit Description
13
TDD TX Circuit
The original TDD RF signal transmitted by the Transceiver goes to the PA for amplification, and then to the
Filter for filtering. Afterwards, the filtered signal goes to the PA, switches to the ANT port, and then to the
antenna unit.
5.2.3 Main Receiving Circuit
FDD RX Circuit
The FDD RF signal from the antenna goes to the ANT port of the PA (U1203), the TRX port, and then the
DUP for filtering. The filtered signal goes to the switch for channel switching, and then to the main receiving
interface of the Transceiver.
TDD RX Circuit
The TDD RF signal from the antenna goes to the ANT port of the PA, the TRX port, and then the DUP for
filtering. The filtered LTE signal goes to the PA for switching, and then to the main receiving interface of the
Transceiver.
5.2.4 Diversity Receiving Circuit
FDD RX Circuit
The FDD RF signal received by the antenna goes to the ANT port in the Switch unit, the RF port, and then
the Filter for filtering. The filtered signal goes to the switch for switching, and then to the main receiving
interface of the Transceiver.
TDD RX Circuit
The TDD RF signal received by the antenna goes to the ANT port of the Switch, the RF port, and then the
Filter for filtering. The filtered signal goes to the main receiving interface of the Transceiver.
5.2.5 GNSS/WLAN/BT Circuit
ANT_GNSS/WIFI/BT
GPS
WIFI/BT
SW (FL1701)
ANT LNA
RF
Transceiver
GNSS_IN
Wireless
Connectivity
IC
WL_BT_RFIO
The GNSS signal goes to the Switch through the GNSS/WLAN/BT three-in-one antenna, and then it is
shunted to the pre-filter for LNA amplification. Afterwards, the amplified signal passes through the

Circuit Description
Service Manual
14
post-filter to the RF Transceiver for demodulation.
The WLAN/BT signal goes to the Switch through the GNSS/WLAN/BT three-in-one antenna, and then
passes through the filter to the WLAN module for demodulation. At the same time, the WLAN/BT signal
can be modulated in the WLAN module, and then passes through the filter and the Switch to the
GNSS/WLAN/BT three-in-one antenna for transmission.