Abell TH308G User manual

TH-308GB UHF SERVICE MANUAL
- -0
ABELL INDUSTRIES CO. LTD
TH308G
SERVICE MANUAL
V．1.0
Web: www.abell.com.cn
Email: [email protected]
TEL: [phone]
FAX: [phone]
ADD: 2F,14BLDG, Zhongxing
Industries city, NanShan,
Shenzhen, China, 518054

TH-308GB UHF SERVICE MANUAL
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Abell Industries Co., Ltd
TH-308GB UHF SERVICE MANUAL
V1.0
Contents
GENERAL………………………………………………………………………………1
REALIGNMENT ………………………………………………………………………2
DISASSEMBLY FOR REPAIR ………………………………………………………3
CIRCUIT DESCRIPTION ……………………………………………………………4
PARTS LIST……………………………………………………………………………5
EXPLODED VIEW ……………………………………………………………………6
PACKING………………………………………………………………………………7
ADJUSTMENT…………………………………………………………………………8
PC BOARD VIEWS
TX-REX UNIT(X57-6030-XX)…………………………………………………9
SCHEMATIC DIAGRAM……………………………………………………………10
SPECIFICATIONS ………………………………………………………………… 11

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GENERAL
INTRODUCTION
SCOPE OF THIS MANUAL
This manual is intended for use by experienced technicians familiar with similar types of
commercial grade communications equipment. It contains all required service information for the
equipment and is current as of the publication data. Changes which may occur after publication are
covered by either Service Bulletins or Manual Revisions. These are issued as required.
ORDERING REPLACEMENT PARTS
When ordering replacement parts or equipment information, the full part identification number
should be included. This applies to all parts: components, kits, or chassis. If the part number is
not known, include the chassis or kit number of which it is a part, and a sufficient description of
the required component for proper identification.
PERSONAL SAFETY
The following precautions are recommended for personal safety：
DO NOT transmit until all RF connectors are verified secure and any open connectors are
properly terminated.
SHUT OFF and DO NOT operate this equipment near electrical blasting caps or in an explosive
atmosphere.
This equipment should be serviced by a qualified technician only.
SERVICE
This radio is designed for easy servicing. Refer to the schematic diagrams, printed circuit
board views, and alignment procedures contained witin.
Destination Number of CH RF power output
DH 16 3W
DL 16 3W

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REALIGNMENT
1 Modes
MODE FUNCTION
User Mode Use this mode for normal operation
PC Mode Use this mode, to make various
settings by means of the FPU
through the RS-232C port.
Manufacture
Mode
Use this mode, to realign the various
settings through the RS-232C port
during manufacture work
2 How to enter each mode
MODE PROCEDURE
User Mode Power ON
PC Mode Connect to the IBM PC compatible
machine and controled by the FPU
3 Setting acquainted
User Mode PC Mode Manufacture Mode

TH-308GB UHF SERVICE MANUAL
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○
1PTT(Push-To-Talk)switch
Press this switch, then speak into the microphone to call a station. Release the switch to
receive.
○
2Monitor Key
Press and hold to monitor how busy the current channel is and to monitor signals being
received that don’t contain the matched QT code.
○
3Channel selector
Rotate to select channels 1-16.
○
4LED indicator
Lights red while transmitting, green while receiving a signal. Flashes red when the battery
voltage is low while transmitting.
○
5Power switch/Volume control
Turn clockwise to switch the transceiver ON. Turn counterclockwise until a click sounds, to
switch the transceiver OFF. Rotate to adjust the volume level.
PC MODE
Preface
The transceiver is programmed by using a personal computer, programming interface
(provided by ABELL) and programming software. Pic 1 shows how the devices work.
Connection procedure
1．Connect the TH-308G to the personal computer with the interface cable(CNX-02).
2．When data is transmitted from the transceiver the red LED lights.
When data is received by the transceiver the green LED lights.
Notes:
·The data stored in the personal computer must match the Model Name when it is written into
the EEPROM. Run the software and connect the transceiver with the personal computer, and
then turn ON.
·DO NOT press the [PTT] key during data transmission or reception.