Abell A-82 User manual

ABELL A-82 UHF Service Manual
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ABELL INDUSTRIES CO. LTD
A-82
SERVICE MANUAL
V．1.0
Web: www.abell.co .cn
E ail: [e-mail] .cn
TEL: [phone]
FAX: [phone]
ADD: 2F,14BLDG, Zhongxing
Industries city, NanShan, Shenzhen, China

ABELL A-82 UHF Service Manual
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ABELL Industries Co., Ltd
A-82 UH SERVICE MANUAL
V1.0
Contents
GENERAL……………………………………………………………………………2
REALIGNMENT……………………………………………………………………..3
DISASSEMBLY OR REPAIR……………………………………………………..8
CIRCUIT DESCRIPTION……………………………………………………………10
Components LIST……………………………………………………………………11
EXPLODED VIEW…………………………………………………………………..38
PACKING…………………………………………………………………………….39
ADJUSTMENT………………………………………………………………………40
ELECTRONIC CIRCUIT DESCRIPTION
…………………………………………………………………46
SCHEMATIC DIAGRAM……………………………………………………………47
PC BOARD VIEWS…………………………………………………………………55
SPECI ICATIONS …………………………………………………………………. 57

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GENERAL
INTRODUCTION
SCOPE OF THIS MANUAL
This anual is intended for use by experienced technicians fa iliar with si ilar types of co ercial
grade co unications equip ent. It contains all required service infor ation for the equip ent and is
current as of the publication data. Changes which ay occur after publication are covered by either
Service Bulletins or Manual Revisions. These are issued as required.
ORDERING REPLACEMENT PARTS
When ordering replace ent parts or equip ent infor ation, the full part identification nu ber should be
included. This applies to all parts: co ponents, kits, or chassis. If the part nu ber is not known, include
the chassis or kit nu ber of which it is a part, and a sufficient description of the required co ponent for
proper identification.
PERSONAL SAFETY
The following precautions are reco ended for personal safety：
·DO NOT trans it until all RF connectors are verified secure and any open connectors are properly
ter inated.
·SHUT OFF and DO NOT operate this equip ent near electrical blasting caps or in an explosive
at osphere.
·This equip ent should be serviced by a qualified technician only.
SERVICE
This radio is designed for easy servicing. Refer to the sche atic diagra s, printed circuit board views,
and align ent procedures contained within.

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REALIGNMENT
1 Mode
MODE FUNCTION
User Mode Use this ode for nor al operation
PC Mode
Use this ode, to ake various settings by
eans of the FPU through the RS-
232C
port.
Manufacture Mode
Use this ode, to realign the various settings
through the RS-
232C port during
anufacture work
2 How to enter each mode
MODE PROCEDURE
User Mode Power ON
PC Mode
Connect to the IBM PC co patible achine
and controlled by the FPU
3 Parts Introduction
Chart 1
User Mode PC Mode Manufacture Mode

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 PTT(Push-To-Talk)switch
Press this switch, then speak into the icrophone to call a station. Release the switch to receive.
Function Key（K1）
This key is progra able, long key(Pressing ti e up to the pre-set) and short key(nor al pressing
ti e) can be progra ed to enable different function
Long key can be progra ed to be: Moniter o entary, Moniter, Squelch off o entary, Squelch off,
Channel announce ent, Alar , Alar off, Scan, Battery announce ent, choose none to not use this
key.
Short key can be progra ed to be: Monitor, Squelch off, Channel announce ent, Alar , Alar off,
Scan, Battery announce ent, choose none to not use this key.
Note: If the long key of K1 is set to be Monitor o entary or Squelch off o entary, the short key of
K1 can not set to be the above two function.
Function Key(K2)
This key is progra able, long key(Pressing ti e up to the pre-set) and short key(nor al pressing
ti e) can be progra ed to enable different function.
Long key can be progra ed to be: Moniter o entary, Moniter, Squelch off o entary, Squelch off,
Channel announce ent, Alar , Alar off, Scan, Battery announce ent, choose none to not use this
key.
Short key can be progra ed to be: Monitor, Squelch off, Channel announce ent, Alar , Alar off,
Scan, Battery announce ent, choose none to not use this key.
Note: If the long key of K1 is set to be Monitor o entary or Squelch off o entary, the short key of
K1 can not set to be the above two function.
Channel selector
Rotate to select channels 1-16.
LED indicator
Lights red while trans itting, green while receiving a signal.
 Power switch/Volu e control
Turn clockwise to switch the transceiver ON. Turn counterclockwise until a click sound, to switch the
transceiver OFF. Rotate to adjust the volu e level.
4 unction instruction
Squelch off/Monitor
Function Squelch off is to open the noise li iting circuit forcibly when Signal-to-Noise rate of the signal
doesn’t reach the start level(The squelch function fails), unction Monitor is to open the noise li iting circuit
forcibly when Signal-to-Noise rate of the signal reach the start level but mute code isn’t decoded. Momentary
status is that when press and hold the key, cancel the Squelch and Monitor function, when release the key, back
to normal. Stable status is that switch the squelch and monitor function by press the key.
TOT
Protect the radio by li iting long-ti e trans iting. “Ti e-Out Ti e” is the li itation ti e for trans iting.
“TOT Pre-Alert Ti e” is to set the ti e between the TOT Pre-Alert and TOT li it, “TOT Reset Ti e” is
the Clear Ti e for the TOT ti er, “TOT Rekey Ti e” is the ti e need for trans iting enable after TOT
alerting.
Squelch Level
Adjust the elasticity degree of the squelch.

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Battery Save
Enable or shut down the power save function.
Channel Announce ent
Enable or shut down the channel announce ent function.
VOX Gain, VOX Delay Ti e
Enable or shut down the VOX function, set the sensitivity of VOX, VOX delay ti e is to set the
trans iting delay ti e after the VOX being enable.
High/Low Power
Switch the high or low power.
Beep
Enable or disable the re inding signal for power on.
Language
Choose the language for the announce ent.
Alar / Alar Cancel
Call for help in e ergency, once enable, will have big voice of alar . If enable the re ote alar , the
transcerver will trans it for 3 second.
Scan
Enable or disable the scan function. Before enable scan function, need to choose the channels need
scan, and preset the para eter of scan in the Scan Set area.
Scan ode
Set the control ode of scan
Priority channel: Set the channels need to listen to in priority during the scan process.
Look back ti e: Set the ti e to ruturn to the priority channel for scan
Rx dwell ti e: Set the stay ti e caused by receiving signal.
Tx dwell ti e: Set the stay ti e caused by trans iting signal.
Battery Announce
Report the battery volu n by announce ent.
DTMF
PTT ID Rate: Set the trans itting rate of DTMF code
Pri acy Digit Code: Adding ti e of pri acy digit code
First Digit Delay: Set the delayti e between trans itting start and pri acy DTMF code
sending(Considering syste /decoder starting ti e). Increasing this para eter has the sa e effect
with “pri acy digital” code increase ent.
*/# Tone: increase the trans itting ti e for the “*” and “#” tone. In so e case, the trans itting ti e of
these two codes ust to be longer than nu ber code, this para eter can be used. However, if the
trans itting start with the “*” and “#”, the radio CPU will choose longer one between */# Tone and
Pri acy Digit Code after co parison.
D Button Assign ent: Set the function and delayti e of D button
PTT ID： Set the trans itting ode and encode of PTT ID

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PC MODE
Preface
The transceiver is progra ed by using a personal co puter, progra ing interface (provided by
ABELL) and progra ing software. Chart 2 shows how the devices work.
Chart 2
Connection procedure
1）Connect the A-82 to the personal co puter with the interface cable.
2）Operate A-82 prgra ing software.
3）Set the co unication interface
4）Operate the progra ing to the radio
5）When data is trans itting fro the transceiver the red LED lights.
When data is receiving by the transceiver the green LED lights.
Notes:
·The data stored in the personal co puter ust atch the Model Na e when it is written into the
EEPROM. Run the software and connect the transceiver with the personal co puter, and then turn
ON.
·DO NOT press the [PTT] key during data trans ission or reception.

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· Progra ing Interface Cable description
(PC progra ing interface cable: Option)
The progra ing interface cable is required to interface the A-82 with the co puter. It has a circuit in
its D-sub connector (9-pin) case that converts the RS-232C logic level to the TTL level. The
progra ing interface cable connects the side panel jacks of the A-82 to the co puter’s RS-232C
serial port.
· Progra ing software description
By installing progra ing software of A-82, users are allowed to progra the transceiver with
progra ing interface cable.
· Progra ing with PC
If data is transferred to the transceiver fro a personal co puter with software provide by ABELL, the
destination data (basic radio infor ation) for each set can be odified. Nor ally, it is not necessary to
odify the destination data because their values are deter ined auto atically when the frequency
range (frequency type) is set.
The values should be odified only if necessary.
Data can be progra ed into the EEPROM in RS-232C for at via the SP MIC plug.

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DISASSEMBLY OR REPAIR
Separating the case assembly from the chassis
1．Re ove the two knobs  and round nut .
2．Re ove the two screws.
3．Expand the right and left sides of the botto of the case asse bly, lift the chassis, and re ove it
for the case asse bly.
Separating the chassis from the unit
1．Re ove the 12 screws .
2．Re ove the solder fro the antenna ter inal  using a soldering iron then lift the unit off.
3．Re ove two waterproof ring
4．Re ove the two antenna connecter
5．Re ove the ain board.

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Chart 3
Note：
：：
：Ensure all these points being soldered well after the ain board is asse blied to the chassis
after repairing.