HYT TC-320 User manual

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Contents
Revision History ---------------------------------------------------------------------------------------------------------1
Copyright Information -------------------------------------------------------------------------------------------1
Disclaimer------------------------------------------------------------------------------------------------------------------------1
Introduction-----------------------------------------------------------------------------------------------------------------------2
Radio Overview-----------------------------------------------------------------------------------------------------------------3
Software Specifications------------------------------------------------------------------------------------------------------4
Circuit Description------------------------------------------------------------------------------------------------------9
CPU Pins-------------------------------------------------------------------------------------------------------16
Parts List 1---------------------------------------------------------------------------------------------------------20
Adjustment Description --------------------------------------------------------------------------------33
Troubleshooting Flow Chart--------------------------------------------------------------------------------------------43
Disassembly and Assembly-----------------------------------------------------------------------------------------------46
Exploded View------------------------------------------------------------------------------------------------------49
Parts List 2--------------------------------------------------------------------------------------------------------53
Packing Diagram--------------------------------------------------------------------------------------------------------55
PCB View-------------------------------------------------------------------------------------------------------56
Level Diagram------------------------------------------------------------------------------------------------------58
Block Diagram------------------------------------------------------------------------------------------------------59
Schematic Diagram--------------------------------------------------------------------------------------------------------60
Specifications-----------------------------------------------------------------------------------------------------------------66

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Revision History
Part No. Date of
Issue
Description
8130032000000 2009.4 Initial Release
8130032000010 2010.9 Circuit Description, Schematic Diagrams, PCB View, Level
Diagram, Block Diagram, Parts List 1 & 2, and Specifications are
updated.
Copyright Information
Hytera and HYT are trademarks or registered trademarks of Hytera Communications Co., Ltd. (“Hytera”)
in PRC and/or other countries or areas. Hytera 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 Hytera product described in this manual may include Hytera computer programs stored in memory
or other media. Laws in PRC and/or other countries or areas protect the exclusive rights of Hytera 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 Hytera computer programs. Any Hytera
computer programs may not be copied, modified, distributed, decompiled, or reverse-engineered in any
manner without the prior written consent of Hytera.
Disclaimer
Hytera 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 Hytera.
If you have any suggestions or would like to learn more details, please visit our website at:
http://www.hytera.cn.

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Introduction
Manual Scope
This manual is intended for use by qualified technicians only.

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Radio Overview
(1)PTT (Push-to-Talk)
Key (2)SK (Side Key ) (3) Speaker (4)Volume Adjust Keys [+]/[-]
(5) Microphone (6) Nameplate (7) Charging Terminal (8) Antenna
(9)Power Switch (10) Channel/Status
Indicator
(11)Channel Selector
Knob
(12)Charge
Indicator
(13)Accessory Jack
Cover (14)Accessory Jack (15)Mini USB Jack (16)Strap Hole
(17)Screw (Belt Clip) (18)Belt Clip (19)Rear Cover (20)Battery Latch

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Software Specifications
Status Indications
Operations/Functions LED Indications and Alert Tones
Power on the source radio while holding down SK,
and the LED flashes red once.
To enter Wired Clone mode
Turn on the target radio directly.
Status of the source radio
(After the target radio is turned
on and the cloning cable is
connected, hold down PTT of
the source radio to begin
cloning.)
The LED glows red during cloning process.
Error occurs during cloning:
a. User Clone: Once clone begins, frequency band
and radio ID (Model ID) will be checked. The LED
glows orange for 2 seconds and then goes out to
indicate a failed check. If the check is successfully
carried out but error occurs during data cloning, the
LED will flash orange. In this situation, press any key
other than the Power Switch to turn it off.
b. Factory Clone: If error occurs during data cloning,
the LED will flash orange until you press any key
other than the Power Switch to cancel it.
Once cloning is completed, the LED will glow green.
And if the battery runs low in Clone mode, the LED
will flash red.
Wired Clone
Mode
Status of the target radio The LED glows green when cloning is in progress.
The green LED goes out once cloning is completed.
Power On (to enter User Mode)
When the radio is turned on, an alert tone sounds and
the LED flashes orange once.
When the radio is currently on a blank channel, it
sounds beep tones continuously.
Power Off When the radio is turned off, the power-off alert tone
is heard.

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Low Battery Alert The LED flashes red, and a low-pitched tone sounds
every 10 seconds.
Transmitting
The LED glows red during transmitting.
When the TOT timer expires, the radio sounds beep
tones continuously.
A TOT pre-alert tone sounds before the TOT timer
expires.
Receiving The LED glows green during receiving.
Scan
The LED flashes green once every second during the
scanning process.
Scan Start Alert (programmable by the dealer): one
beep.
Scan End Alert (programmable by the dealer): one
beep.
Writing/Reading The LED glows red in reading data.
The LED glows green in writing data.
Power Adjustment
A low-pitched tone is heard when the radio switches
from high power to low power.
A high-pitched tone is heard when the radio switches
from low power to high power.
Monitor/VOX The alert tone sounds once if the feature is enabled.
The alert tone sounds twice if the feature is disabled.
Description of Modes
User Mode
It is a conventional communication mode. The radio will enter this mode if you turn it on directly.
PC Programming Mode
The radio in User Mode enters PC Programming Mode through specific protocol based communication
with the programming software. In this mode, radio functions and adjustment parameters can be set

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through the programming software (including User Version and Factory Version).
The operation procedures are as follows:
1) Install PC programming software and its driver dedicated for TC-320 before your initial use.
2) Connect the USB port of PC with the Mini USB jack of the radio using a programming cable.
3) Turn on the radio.
4) Launch the programming software to perform reading or writing operation.
Note:
1) When reading/writing data is in progress, red/green LED glows; when reading/writing data is
completed, red/green LED goes out.
2) During the operation, if any abnormal situation occurs or no reply is given within a period, the
reading/writing operation will fail and an error message window will pop up.
Wired Clone Mode
1. Description
Wired Clone Mode is an independent mode. To access other modes, you must restart the radio.
Wired Clone Mode covers User Clone Mode and Factory Clone Mode.
1）User Clone Mode:
Connect two radios using a clone cable. Power on the source radio while holding down SK, and it
will enter User Clone Mode after 2 seconds. The target radio can be directly turned on to enter user
mode. In this mode, data stored in EEPROM of the source radio will be cloned to EEPROM of the
target radio. The data transferred only involves channel data and common parameters, excluding
adjustment data, version and serial No. of the model.
2）Factory Clone Mode:
Connect two radios using a clone cable. Power on the source radio while holding down SK, and it
will enter User Clone Mode by default after 2 seconds. Press SK afterwards to switch to Factory
Clone Mode. The target radio can be directly turned on to enter the mode. The data transferred
covers all data in EEPROM other than serial No, with flag of manual adjustment switch included.
2. Process
Process of Wired Clone:
1) The LED flashes red once after the source radio enters Wired Clone Mode. Hold down PTT to clone
data to the target radio.

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2) During communication, LED of the source radio glows red, and LED of the target radio glows green.
When communication finishes, LED of the source radio glows green and LED of the target radio goes
out, indicating that both radios are ready for another cloning operation.
3) If any abnormal situation occurs during cloning, the source radio will stop cloning and its LED will flash
orange, indicating both radios are ready for another cloning operation.
4) When the communication ends, the source radio goes back to standby status. Hold down PTT again
to begin another cloning.
Manual Adjust Mode
Hold down PTT and SK on the radio while powering it on, and the radio enters Manual Adjust Mode.
(Note: This operation is subject to the option Panel Test Mode in the programming software. When this
option is unchecked, the radio will be unable to enter the adjustment mode. It helps avoid change of
parameters and degradation of radio performance caused by user’s misoperations. )
Keep this option unchecked after values are well adjusted from factory, to avoid any unexpected change
of values. The adjustment values can be reset and changed in Factory Mode only.
Description of adjustment:
1) To enter Manual Adjust Mode
Hold down PTT and SK for 2 seconds while powering on the radio. The LED will glow orange when the
radio is in Adjust Mode. When the keys are released, the radio will enter item N of TX group (N depends
on the position where the Channel Selector knob locates).
2) To switch between TX group and RX group
This operation is done through the Channel Selector knob.
The LED glows red when adjusting items in TX group.
The LED glows green when adjusting items in RX group.
3) To switch between items of TX group/RX group
This operation is done through the Channel Selector knob.
TX group: CH1 to CH9 stand for TX Low Power, TX High Power, CDCSS Balance, CDCSS Deviation,
CTCSS Deviation (low), CTCSS Deviation (medium), CTCSS Deviation (high), TX Low Voltage
Threshold and Max. Deviation of TX Audio respectively.
The LED solidly glows red when adjusting items CH1 to CH9.
RX group: CH10 to CH12 stand for SQL On 5, SQL Off 5, and RX Low Voltage Threshold respectively.

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The LED solidly glows green when adjusting items CH10 to CH12.
CH13 to CH16 are invalid and the LED goes out, indicating that no adjustment item is carried out.
4) To switch between wide and narrow bandwidth
In adjusting a certain item, short press SK (the LED flashes orange to indicate valid press) to switch
between wide and narrow bandwidth. After this operation, the first frequency of the current bandwidth is
the frequency for adjustment by default.
5) To switch frequency
Short press PTT (the LED flashes green to indicate valid press) to switch frequency one by one, under
certain bandwidth and adjustment item.
6) To increase/decrease adjustment value under certain bandwidth and adjustment item
Short press [+] under certain bandwidth and adjustment item, and the adjustment value will increase in
steps of 1; hold down [+], and the adjustment value will keep increasing in steps of 1. The adjustment
value will remain unchanged once it reaches the allowed maximum value.
Short press [-] under certain bandwidth and adjustment item, and the adjustment value will decrease in
steps of 1; hold down [-], and the adjustment value will keep decreasing in steps of 1. The adjustment
value will remain unchanged once it reaches the allowed minimum value.
7) Operations on special items:
TX group: CH8 is the TX Low Voltage Threshold. This adjustment item is related to AD sampling. Press
[+] or [-] after entering the above item, to activate AD sampling (including calculation) once. Rotate the
Channel Selector knob to save the current AD sampling value.
RX group: CH10 to CH12 stand for SQL On 5, SQL Off 5, and RX Low Voltage Threshold respectively.
These adjustment items are related to AD sampling. Press [+] or [-] after entering the above items, to
activate AD sampling (including calculation) once. Rotate the Channel Selector knob to save the
current AD sampling value.
8) Description of key press:
Short press: key press no longer than 1 second;
Long press: key press time longer than 1 second.