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