TC320 Technical Training
Hytera Communications Co., Ltd
Edited by Adam Sun
22Feb2012
Global Customer Service Center
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Hytera Communications Corporation Limited
Content
1. Main Function & Feature
2.Technical Specification
3.Software & Setting
4.Disassembly & Re-assembly
5.Circuit Description & Analysis
6.Basic Troubleshooting
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1. Main Function & Feature
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Main Function & Feature
TC320 is a economy/business two-way radio which
spread to the world in 2008 with different marketing
requirement.
It is unique for its compact and delicate size, and the
ergonomically design will give you an exceptional
experience of portability, deliver you secure, instant and
reliable communications at peak efficiency.
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Main Function & Feature
 Fine shape fashion
TC-320 smooth lines, ultra-thin
appearance, with the mechanical design
of the human body works. As a result of
the use of mitigation for a long time and
have a sense of fatigue. The whole
production with battery and antenna,
weighs about 135g.
 Easy one-hand operation
TC-320 with the fine and streamlines
body, use power switches and buttons to
adjust the volume. Feel very good
channel knob and PPT button, users can
ensure that a signal basic walkie-talkie in
one-hand operation.
 Mini USB socket
programming/charging
TC-320 with a mini-USB interface,
through HYT dedicated date lines, it can
be achieved to TC-320 charge and direct
programming.
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Main Function & Feature
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Scramble
Compander
Power display
High / Low Power switch
Channel spacing adjustable
Monitor
VOX
USB socket-charge/programming
Auto-saving feature
Electricity shortage warning
Busy channel lock
Launch time-out timer
Computer Programming
Wire clone
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2. Technical Specification
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Technical Specification
General Technical Specifications
Freuquency range
400-420MHz 430-450MHz 450-470MHz
Channel capacity
16ch
Chanel space
25/12.5KHz
Frequency stability
±5ppm
Operating voltage
3.8V DC
Alert voltage (RX/TX)
3.7V/3.5V DC
Forbid TX voltage (RX/TX)
3.5V/3.3V DC
Power off voltage
3.1V DC
Dimension (lenth×width×height)
(with battery, no antenna)
100mm×48mm×27mm
Weight(with antenna and battery)
135g
Battery capacity (mAh)
1100mAh（Li-ion）
≥10 hours
Working time
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Technical Specification
Description of positive /negative electrode
Positive electrode
Negative electrode
Negative electrode
Positive electrode for charging power
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Negative electrode
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Technical Specification
CV voltage specification and adjustment
CV voltage
High frequency
Low frequency
RX
2.1±0.05V
≥0.5V
TX
≤2.3V
≥0.5V
Notes:
There is only one communal VCO for TX/RX while adjusting CV voltage. When
adjust TC101, we need pay attention to TX CV voltage and RX CV voltage at
same time. After adjustment, we should cover the hole with copper sheet.
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Technical Specification
Specification and adjustment for TX
TX
Frequency error
±600Hz
RF output power
≥0.2W
RF current while TX
high power
1.0-1.4A
Modulated limitation
for width
3.8-4.8KHz
Modulated distortion
≤5%
Notes:
It should have a inductive test while testing the whole radio, the specification as
above. TX output power for PCB testing is 2.0W/0.5W, the TX current ≤1.4A/0.8A.
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Technical Specification
Specification and adjustment for RX
RX
Receiving sensitivity
0.25uV/0.28uV
Maxium audio power
0.8W（16ohm）
the rated audio
distortion
5%（0.4W）
squelch level voltage
0.1-1.8uV
Notes:
Due to external interference ,the squelch level voltage range has some deviation.
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3. Software & Setting
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Software & Setting
Programming Software Description
In user mode, we can set some function and parameters via programming software in
PC, the operation is as following:
1) Install the programming software of TC320 in PC
2) Connect the TC-320 and PC with the programming cable, one side is USB interface of PC,
the other side is Mini USB socket of TC320
3) Turn on the radio
4) Open the programming software, and read the data from the TC320
Notes:
1) If the radio enter the “READ” successfully, it will glitter red light, after having done it, it will
extinguish red light; if the radio enter the “WRITE” successfully, it will glitter green light,
after having done it , it will extinguish with green light.
2) During the course of programming, if there is some abnormal case or no response, it show
that the programming is failure, and the PC will alert some wrong information.
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Software & Setting
Programming Software Description
The programming software of TC-320 is the same with TC-518.
Programming software latest version: HT518-320-310E-V1.01.16.
Its download address: http://www.hytera.cn/dl/index.aspx?rid=47&uid=6362&tid=1&url=/Service/HT518-320-310E-V1.01.16(Programming software).zip
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Software & Setting
After install the programming software of TC320, click “Model” --- “Model information” ,we can
select the corresponding radio type and frequency range, then can do some operations such
as “READ” or “ WRITE”.
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Software & Setting
From the function of “Buttons/Keypad”, we can set the corresponding function of “SK1”, a
new function of “Channel Lock” can be set here.
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Software & Setting
Notes: Do not enable the function of “panel test mode” and “factory clone mode”.
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Software & Setting
From “Per Channel”, we can set some parameters such as “frequency , power level,
CTCSS/CDCSS” etc.
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Software & Setting
From the “Per personality” , we can set some special parameters of “ TX/RX”
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Software & Setting
From “Scan”, we can set some parameters for scan personality
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Software & Setting
Wire Clone Mode
1.
The operation of wire clone mode
1)
Connect the master radio and slave radio with clone cable, press “SK” key of master radio
and turn on the radio, after 2 seconds, it will enter wire clone mode, just turn on the slave
radio, it also will enter wire clone mode
2)
In wire clone mode , we can switch user clone mode to factory clone mode via pressing “SK”
key ( we should enable “factory clone mode” in programming software , or we can not switch
it )
3)
While press “PTT” key , the data from master radio will clone to slave radio, after finish it ,we
can continue to clone other radios
2.
3.
4.
The indication of wire clone mode
1)
The LED will glitter red light while cloning, and it will glitter green light after finish cloning;
2)
Slave radio：the LED will glitter green light and it will go out green light after finish cloning
The difference between “factory clone mode” and “ user clone mode”
1) User clone mode: only can clone the related data ( such as frequency , CTCSS etc.) in user
mode, it will not clone the adjusted frequency , baseband parameters etc.
2) Factory clone mode: it will clone all data except “series number”
Notice
1) If the clone cable is not good contact, it will cause error
2) If the LED flash red light while cloning, the master radio will alert low voltage emergency, but
the data will not stop cloning
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4. Disassembly & Re-assembly
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Disassembly & Reassembly
Components Description
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Disassembly & Reassembly
Components Description
(1) PTT key (TX key)
(2) SK key
(programmable
key)
(3) speaker
(4) Volume
adjustable key
(5) mic
(6) Model logo
(7) Charge pole
(8) atenna
(9) Power switch
(10) Status indicator
(11) Channel
slecetor switch
(12) Charge
indicator
(13) Earphone plug
(14) Earphone
socket
(15) Mini USB socket (16) Belt clip
(17) Belt clip screw
(18) Battery cover
(19) Battery latch
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Disassembly & Reassembly
Disassemble Radio
1.
2.
3.
4.
Turn off the radio
Remove the antenna
Remove the battery
Push the battery latch upward.
1) Remove the battery cover
2) Take out the battery from the bottom
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Disassembly & Reassembly
Disassemble Radio
5. Disassemble the channel selector knob
and nut, waterproof ring.
1)
2)
3)
4)
Remove the channel selector cover
Remove the nut
Remove the channel selector knob
Remove the nut and waterproof ring
Channel selector cover
Channel selector knob
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Nut and waterproof ring
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Disassembly & Reassembly
Disassemble Radio
6. Disassemble the back case and side
PTT cover
1) Remove the four screws from the back
case.
2) Push the back case upwards
3) Pull out the back case
4) Take out the side PTT cover
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Disassembly & Reassembly
Disassemble Radio
7. Disassemble PCB
1) Remove the 2 screws from the PCB
2) Remove the steady ring from the PCB and the channel selector switch
3) Pay attention to the speaker line and charge pole of back case
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Disassembly & Reassembly
Reassemble Radio
1. Reassemble PCB
1) Reassemble the MIC cover
2) Make sure the speaker is good
contact, the installation of
charge pole in back case is
normal
3) Install the steady ring of
channel selector switch and
put the PCB inside it
4) Screw the two screws
MIC
cover
Speaker
cable
Steady ring of
channel selector
Install ST1. 7X4
screws in the PCB
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Reassemble the
model cover
Install the
screw
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Disassembly & Reassembly
Reassemble Radio
2. Reassemble back case
1
3
1) Reassembly the side PTT
cover
2) Take out the sponge and put it
to right place.
3) Screw the four screws
Install 4pcs
PT2.0*8.0mm
screws in
sequence
PTT cover
2
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Disassembly & Reassembly
Reassemble Radio
3. Reassemble the top nut and cover
1) Install the waterproof ring to the nut
2) Install the nut with the waterproof ring
to the main unit, and screw it tightly
with a cross sleeve
3) Install the channel selector knob
4) Screw the fixed screws
5) Install the channel selector knob cover
Waterproof
ring
Installation
direction
Channel
Selector
Knob
5
Screw the fixed
screws
Take out the protect
paper. Install the
cover matching the
marked point
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图13
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Disassembly & Reassembly
Reassemble Radio
5
4. Reassemble the antenna
5. Install the battery and battery
cover
Note
Stick
copper foil
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5. Circuit Description & Analysis
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Circuit Description & Analysis
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Circuit Description & Analysis
1. RF Parts
1.1 PLL
PLL circuit generates the first local oscillator for reception and the RF signal for transmission
VCO
V_SAVE
Q102
D101
D102
D103
Q101
MOD
RIPPLE FILTER
LD
LOOP FILTER
CP
SW
Q103
D105
VCO IN
U501
XT101
R103
C132
QT_OUT
V_SAVE
PLL circuit diagram
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R/T
Circuit Description & Analysis
1. RF Parts
1.2 RF power amplifier
The demodulated carrier signal which output from VCO is pre-amplified by U501 and amplified by Q401,
Q402, Q403, the amplified RF signal will be filtered by LPF to remove unwanted signal and send to
antenna.Q404, Q405 and U401 are composed of APC, U401 is used to control the bias voltage of
driving transistor Q402 and power amplifier FET Q403 so as to control transmitting current.
RF AMP
RF AMP
Q401
Q402
Q403
LPF
1
PRE AMP
TX OUT
R419
R420
R421
VT
SW
Q405
SW
Q404
W402
ANTENNA
V_BAT
APC
U401
APC
RF power amplifier circuit diagram
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Circuit Description & Analysis
1. RF Parts
1.3 RX
The input signal from antenna is filtered by acoustic wave filter to remove unwanted signal and amplified
by Q506,then enter the high frequency /low noise filter of U501 for amplifying ,the amplified signal will
be second mixed, demodulated, filtered, de-emphasis, decode and D-A switch and get audio signal.
VCO
MIX
SWAF3
RX LO
1
Q505
W402
ANTENNA
XF501
IF AMP
Q504
U501
LPF
SWAF
D504
D505
CF501
1
D502
D503
2
1
2
SWAF
SW
NFIL IN
Q506
VR
R305
C306
SW
RF AMP
VR
SW
Q501
Q502
CD501
RFC
AF
BUSY
Receiving circuit diagram
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Circuit Description & Analysis
2. MCU/Signal processing and audio amplifier
D601
EC0 EC1 EC2
CH SW
EC3
R_LED
B302
1
2
LED
PTT MON ON/OFF
UP
DOWN
APC
QT_OUT
RFC
LD
DATA
CK
STB
DEMOD
APA EN
MIC IN
MOD OUT
R/T
1
2
T_LED
2
AMP
LED
+
Speaker
J202
U301
EXT PTT
U601
Q201
Q202
EXT MIC
B303
TXD
J201
V_BAT
U603
EEPROM
R602
R603
TX_CTL
SW
U605
RESET
G601
2
BATTERY
V_SAVE
VCC
U602
DC-DC
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Q602
2
1
+
MIC
RX_CTL
SCL
SDA
BAT
X601
SAVE
RXD
BUSY(SQL)
1
1
AF OUT
RESET
KEY SW
D602
VR
SW
Q601
VT
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Circuit Description & Analysis
2. MCU/Signal processing and audio amplifier
2.1 MCU
The control circuit is composed of MCU, EEPROM.
The main function of MCU: data’s transmitting and store; checking the signal of external pressing
keys, VOX-DET and process; control and switch receive /transmit; open/close the squelch circuit;
output a controlling signal to control high/low switch circuit, audio amplifier circuit, VCO power
supply circuit, receiving power supply circuit and transmitting power supply circuit.
2.2 Signal process
 Transmitting baseband process
 Receiving baseband process
2.3 Audio amplifier
The audio signal out from U601 is processed and amplified by audio amplifier IC(U301) and drive
the speaker to get audio.
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Circuit Description & Analysis
2
U602
DC-DC
G601
BATTERY
TX_CTL
VCC
RX_CTL
SAVE
3. Power Supply
SW
VT
1
Q601
SW
V_SAVE
VR
Q602
Power Supply Diagram
The power supply of 3.7V which controlled and switched by U602 and get two line 3V DC, one is VCC
for CPU, the other 3V to VT and VR under the controlling of V-SAVE, also it supply V-SAVE to PLL.
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6. Basic Troubleshooting
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Basic Troubleshooting
1. Can not power on
2. No voice or abnormality voice
while powering on
3. No /low TX power
4. No Rx/low receiving sensitivity
5. Unlock while powering on
6. Can not charge normally
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Basic Troubleshooting
1. Can not power on
Steps
1) Check the battery capacity is
full and the battery plate is well
contact with the main unit
2) Check the power switch is
broken
3) Check whether pin6 of AVR IC
U602 is 3V output
4) Check the crystal 32.768KHz
for CPU is broken
5) Check the reset IC U605 is
broken?
6) Check the pins of CPU is
falsely-soldering
Power switch
AVRU602
Reset IC
U605
32.768KHz
CPU falselysoldering
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Basic
Troubleshooting
6. Basic
Troubleshooting
2. No voice or abnormal voice while
powering on
Steps
1) Check speaker, speaker line’s soldering is normal
2) Check speaker socket is broken
3) Check audio power amplifier IC U301（AP4890）is normal
Speaker socket
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Audio power
amplifier
The soldering
of speaker line
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Basic Troubleshooting
3. No/low TX power
Steps
1) Check the output voltage of
Q601
2) Check TX current
3) Check the bias voltage of final
power amplifier
4) Check the output voltage of pin4
for U501
5) Check power amplifier while
there is current but no TX power.
Check power supply for TX
circuit while there is no current
no power.
about 3.7V
about1.0V
Final PA
RQA0002
U501
Q601
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Basic Troubleshooting
4. No RX/low Receiving Sensitivity
Steps
1) Check the crystal of band pass filter is broken
2) Check filter 450KHz is loose or broken
3) Check the first mixer Q505 is broken
4) Check the IF processing of IC U501 is falselysoldering or broken
5) Check the demodulator is loose or broken
IF IC U501
1st Mixer Q505
450 Filter
Crystal
21.7MHz
50C24
demodulator
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Band-pass filter
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Basic Troubleshooting
5. Unlock while powering on
Steps
1) Check CV is normal
2) Check the output voltage of pin85 for CPU is normal (H: lock, L: unlock)
3) Check the crystal of 21.25MHz is normal
4) Check the pins of IC U501 for PLL is falsely-soldering or broken
CPU
CV test point
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21.25M
crystal
PLL IC U501
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Basic Troubleshooting
6. Can not charge normally
Steps
1) Check the output voltage of adapter
is normal
2) Check the Mini USB socket is
normal
3) Check the output voltage of charging
IC U604 is normal
Mini USB
socket
IC U604
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THANKS
Please call or email Hytera Global Customer Service Center, if you have any
question about Hytera Product.
Service Direct Line:
+86-755-86137081
Email:
overseas.service@hytera.com
Website:
www.hytera.com
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