HYT TM-628H User manual

8130062800000
TM-628H
MOBILE RADIO
L06774 X05031

TM-628H Service Manual
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Contents
Introduction………………………………………………………………………………………..2
Safety Information………………………………………………………………………………..2
Radio Overview…………………………………………….……………………………………..4
Software Specification…………………………………….………………………………….....7
Circuit Description…………………………………….………………………………………...13
Semiconductor Data…………………………………….………………………………………18
Component Description…………………………………….………………………………….23
Parts List 1…………………………………….………………………………………………….24
Tuning Description…………………………………….………………………………………..62
Terminal Function…………………………………….…………………………………………76
Troubleshooting Flow Chart…………………………………….…………………………….79
Disassembly and Re-assembly for Repair…………………….……………………………83
Exploded View…………………….……………………………….…………………………….86
Parts List 2…………………….…………………………...……….…………………………….87
Packing…………………….…………………………………………….…………………….….89
PCB View………………….……………………………….……………………………….……..90
Block Diagram…………….……………………………….……………………………….…....96
Schematic Diagram……….……………………………….……………………………….…...97
Specifications…………….……………………………….…………………………...….…....114

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Introduction
Manual Scope
This manual is intended for use by experienced technicians familiar with similar types of communication
equipment. It contains all service information required for the equipment and is current as of the
publication date.
Safety Information
The following safety precautions shall always be observed during operation, service and repair of this
equipment.
zThis equipment shall be serviced by qualified technicians only.
zDo not modify the radio for any reason.
zUse only Hytera supplied or approved antenna.
zGain of antenna must not exceed 3dBi for VHF or 5.5dBi for UHF.
zMobile antenna Installation: Install the mobile antenna at least 82cm (32 inches) away from your
body, in accordance with the requirements of the antenna manufacturer/supplier.
zTransmit only when people inside and outside the vehicle are at least the minimum distance away
from a properly installed, externally mounted antenna.
zMobile antenna substitution: Don’t substitute Hytera supplied or approved antenna, or excessive
radio frequency radiation will result. Please contact your dealer or the manufacturer for further
instructions.
zPlease make sure there’s no stress on the antenna joint during transportation or installation.
zTo avoid electromagnetic interference and/or compatibility conflicts, turn off your radio in any area
where posted notices instruct you to do so. Hospital or health facilities may be using equipment that
is sensitive to external RF energy.
zFor vehicles with an air bag, do not place a radio in the area over an air bag or in the air bag
deployment area.
zTurn off your radio prior to entering any area with explosive and flammable materials.
zDo not expose the radio to direct sunlight over a long time, nor place it close to heating source.

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▇Operation Guidelines
For vehicles equipped with electronic anti-skid braking systems, electronic ignition systems or electronic
fuel injection systems, interferences may occur during radio transmission. If the foregoing electronic
equipments are installed on your vehicle, please contact your dealer for further assistance to make sure
that radio transmission will not interfere with these equipments.
For radio installation in vehicles fueled by LP gas with LP gas container within interior of the vehicles, the
following precautions are recommended for personal safety.
1. Any space containing radio equipment shall be isolated by a seal from the space in which the LP gas
container and its fittings are located.
2. Remote (outside) fitting connections shall be used.
3. Good ventilation is required for the container space.
▇Installation Guidelines
zVehicle installation: The antenna can be mounted at the center of a vehicle metal roof or trunk lid if
the minimum safe distance is observed.
zDo not mount the mobile radio overhead or on a sidewall unless you take special precautions.
zIf the mobile radio is not properly installed, road shock could bump the radio loose, and the falling
radio could, in some circumstances, cause serious injury to the driver or a passenger. In case of
vehicle accidents, even when properly installed, the radio could break loose and become a
dangerous projectile.

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Radio Overview
Front Panel View
①Volume Control Knob
②LCD
③Programmable Functions Keys ([▲]/ [▼])
④LED Indicator
⑤Speaker
⑥Power Switch
⑦Programmable Functions Keys ([P1]/[P2]/[P3]/[P4])
⑧Mic Jack

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Rear Panel View
①15-Pin Connector (for external expansion)
②External Speaker Jack
Used to connect the external speaker (for the 3.5mm plug only).
Note: Please refer to “Test Cable for Speaker Output” in “Tuning Description” for details.
③Power Inlet
Used to connect the Hytera-authorized DC power cable for input of 13.6V DC power.
④Antenna Connector
Microphone
LED Indicator▇
Indicator Description
Solidly glows red The radio is transmitting signals.
Solidly glows green The radio is receiving signals.
Flashes orange The radio has received encoding squelch, select calls or 2-tone calls.

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▇LCD Display
Indicator Description
Displays CH number/name, zone number/name, DTMF
number, frequency, menu and options, etc.
Lo Indicates low power output.
Press the Monitor key:
1. The icon is displayed when CTCSS/CDCSS and
2-Tone decoding is off.
2. The icon is displayed when the speaker is unmuted.
Appears when the radio begins to scan
Appears when the radio is transmitting a selected call.
C indicates that the current channel is in the scan list.
Z indicates multi zone scan.
Appears when the Scrambler feature is enabled.
Appears when the Compandor feature is enabled.
Appears when the current channel is already in use.
Indicates the current channel is the priority channel. P•
indicates priority channel 1, P.indicates priority channel 2,
P:indicates priority channels 1 and 2.

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Software Specification
Frame of Radio Modes
Keypad Entry for Mode Startup
Mode Display Operation Remarks
User Mode Welcome Screen and then CH
number
The radio enters User Mode
upon power-on.
Conventional
Mode
Panel Tuning
Mode TXHIGH Power the radio on while
holding down P1.
Model Set Mode DESTINA0 Power the radio on while
holding down P2.
Clone Mode CLONE Power the radio on while
holding down P3.
Firmware Version
Display Mode Firmware Version VX.XX.XX Power the radio on while
holding down P4.
PC Mode PROGRAM
Connect the mobile radio to
PC via the programming
cable, and then send
commands via PC.
User Mode
Power on the radio and you will enter this conventional mode.
PC Mode
Tuning Mode
Conventional Mode
User Mode
Model Set Mode
Clone Mode
Wired Clone Mode
Wireless Clone Mode

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Panel Tuning Mode
You can perform tuning in the following steps:
1) Power on the radio while holding down P1 to enter the tuning mode.
2) Use ▲/▼to select the tuning item, and press P4 to enter.
3) After you enter the sub-item by pressing P4, use ▲/▼to adjust the parameter, and press P4 to save
and enter the next sub-item; or press P1 to return to the previous menu without saving the settings.
Tuning items and display (***: 1-256): Please go to Tuning Description---Panel Tuning Mode---Tuning
items and Display for details.
Model Set Mode
You can go with operations in this mode as follows:
1) Power on the radio while holding down P2 to enter the Model Set mode. At this time, the LCD displays
“DESTINA.*”, where “*” represents the model number.
2) Use ▲/▼to select the model number 0-5.
3) Press P4 to confirm your selected model number. The LED glows orange and the LCD displays
“WAIT”. After reset, the radio enters User mode.
Note: Once a new model is set by pressing P4, the previously stored channel information (such as
frequency, CTCSS/CDCSS and functions assigned to each channel) will be cleared, and some
functions will also be changed. Therefore, do not perform this operation unless it’s very
necessary (e.g. when EEPROM is replaced).
Clone Mode
Data can be transferred from radio to radio either by wired cloning or wireless cloning. Operation
methods are given in the following paragraphs.
Wired Clone Mode
1) Power on the source radio while holding down P3. The radio displays “CLONE” and enters Clone
mode or enters User Mode if Clone Mode is set OFF by your dealer.
2) Press P3 to switch between Dealer Clone Mode and Factory Clone Mode, with “DEACLONE” and
“FACCLONE” displayed respectively. The radio restores its original display mode in 5 seconds.
Dealer Clone Mode is the default mode in which tuning data and embedded messages will not be
cloned. However, in Factory Clone Mode, all data will be cloned.
3) Connect two radios using a clone cable, and then turn on the target radio.

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4) Press P4 on the source radio to start cloning. LED on the source radio glows red, and it begins to
transmit data to the target radio. During the cloning process, LCD of the target radio displays
“PROGRAM” and its LED glows green. Upon completion of cloning, LCD of the source radio
displays “END”. And the target radio automatically enters User Mode after receiving all data.
5) Press P4 on the source radio to return to Clone Mode, and “CLONE” is displayed. Repeat the above
steps for further wired cloning.
Wireless Clone Mode
1) Power on the source radio while holding down P3. The radio displays “CLONE” and enters Clone
mode or enters User Mode if Clone Mode is set OFF by your dealer.
2) Press P1 to enter Wireless Clone Mode. The LCD displays “WIRELESS” for about two seconds,
and then displays its channel frequency (wireless cloning is performed at this frequency). Press P1
again to return to Clone Mode, or press ▼to switch the channel for wireless cloning.
3) Press P3 to switch between Dealer Clone Mode and Factory Clone Mode, with “DEACLONE” and
“FACCLONE” displayed respectively. The radio restores its original display mode in 5 seconds.
Dealer Clone Mode is the default mode in which tuning data and embedded messages will not be
cloned. However, in Factory Clone Mode, all data will be cloned.
4) For the target radio, repeat the above steps 1) and 2), and set its cloning frequency the same as that
of the source radio. Place the target radio close to the source radio, and press P4 of the source
radio to start cloning.
5) The source radio is transmitting data to the target radio. During data transmission, the source radio
displays the percentage of the transmitted data, with red LED glowing. During data receiving, the
target radio displays the percentage of the received data and a “BUSY” icon, with orange LED
glowing.
6) Upon completing of data transmission, LCD of the source radio displays “END” and the LED flashes
red. Press P1 to read the cloning frequency and repeat the above steps to continue. The target
radio enters User Mode automatically after receiving all data.
Note: Clone Mode can be enabled or disabled by your dealer. You can perform cloning only when such
mode is enabled by your dealer.