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Extracted text from Kenwood TK 481 Service Manual (Ocr-read)
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TK-480/481
GENERAL / SYSTEM SET-UP
INTRODUCTION
SCOPE OF THIS MANUAL
This manual is intended for use by experienced techni-
cians familiar with similar types of commercial grade com-
munications equipment. It contains all required service in-
formation for the equipment and is current as of this publica-
tion date. Changes which may occur after publication are
covered by either Service Bulletins or Manual Revisions,
which are issued as required.
ORDERING REPLACEMENT PARTS
When ordering replacement parts or equipment informa-
tion, the full part identification number should be included.
This applies to all parts : components, kits, and 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.
PERSONNEL SAFETY
The following precautions are recommended for person-
nel safety :
- DO NOT transmit until all RF connectors are secure and
any open connectors are properly terminated.- SHUT OFF this equipment when near electrical blasting
caps or while in an explosive atmosphere.
- This equipment should be serviced by only qualified tech-
nicians.
SERVICE
This radio is designed for easy servicing. Refer to the
schematic diagrams, printed circuit board views, and align-
ment procedures contained within.
NOTE
WE CANNOT guarantee oscillator stability when using
channel elements manufactured by companies other than
KENWOOD or its authorized agents.
You must use the KPG-49D to program TK-480/481 trans-
ceivers with a serial number of 30100001 or greater. You
cannot use the KPG-35D for those radios.
TK-480/481 transceivers with a serial number of
30100001 or greater have a red triangle in the KENWOOD
logo label (B43-1139-04) on the front panel. You will also
find the model name plate marked as Ver 2.0 on the rear
of the transceiver.
Unit TX-RX unit Display unit
Model &X57-5630-XX X54-3210-XX
Frequency range Remarks QT/DQT DTMF Charger Battery 16 key
destination 0-10 0-11 0-10 0-11
TK-480K
806~870MHzIF1 : 44.85MHz
Option-“
K2LOC : 44.395MHz
TK-481K
896~941MHzIF1 : 44.85MHz
Option-“
K2LOC : 44.395MHz
Note X57-5630-XX/X54-3210-XX : Produced in Singapore
Merchandise received
License and frequency allocated by FCC
Choose the type of transceiver
Transceiver programming
Are you using the speaker microphone?
Delivery TX 806~825 2.5W TK-480 K,K2
851~870
RX 851~870
TX 896~902 TK-481 K,K2
935~941
RX 935~941 Frequency range (MHz) RF power Type
A personal computer (IBM PC or compatible), programming
interface (KPG-36), and programming software (KPG-49D) are
required for programming.
(The frequency, trunked system features, conventional system
features, TX power HI/LOW, and signaling data are programmed
for the transceiver.)
YES
NO KMC-25
Speaker microphone
(Option)
SYSTEM SET-UP
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TK-480/481
OPERATING FEATURES
1. Operation Features
The TK-480/481 is an 800/900MHz band EFJ LTR-„¢-com-
patible trunked radio designed to operate in both trunked
and conventional modes. The programmable features are
summarized.
Model Trunking mode
Conventional mode
This model can handle up to 32 systems with up to 250
groups in each system. The transceiver can be used in both
trunked mode and conventional mode. Systems, groups,
and their functions are programmed.
2. Transceiver Controls and Indicators
2-1. Physical Layout
5
4
1 2 3Microphone Speaker
6
10
11
12
9
7
8
Note :The transceiver is also available without the DTMF
keypad (
).
2-2. Panel controls
The key on the top and front panel is momentary-type
push buttons. The functions of these keys and knob are ex-
plained below.
Antenna connector
Connect the supplied antenna here.
System or Group selector knob (Programmable)
Turning the system (or group) selector knob clockwise
increases the system (or group) number by one. Turning
the knob in the counterclockwise direction decreases the
system (or group) number by one.
After the system number (or group number) reaches the
highest system number (or group number), it goes back
to lowest system number (or group number).
System numbers (or group numbers) not set are skipped.
Caution : The FPU (KPG-49D) allows selecting between
system selector and group selector.
Volume/Power switch
Transceiver Power and Volume switch. Turn clockwise to
switch On the transceiver. Turn counterclockwise fully to
switch OFF the transceiver. Also adjusts the volume
level. When the power is switched off, all the param-
eters, such as the system and group, are stored in
memory. When the power is switched on again, the sys-
tem returns to the previous conditions.
Auxiliary (orange) key (Programmable)
Battery pack release catch
Push down to release the battery pack. See Installing the
Ni-Cd Battery Pack.
MONITOR key* (Programmable)
PTT (Push-To-Talk) key
Press this key, then speak into the microphone to call a
station.
LAMP key* (Programmable)
TX/BATT indicator
This red LED lights during transmission (it does not light
during busy or when transmit is prohibited). If the battery
voltage falls below the programmed voltage during trans-
mission, the brightness of this indicator decreases at in-
tervals of about one second, so it can be used as the bat-
tery voltage alert function.
S, A, B, and C key (Programmable)
DTMF keypad (keypad model only)
Press the keys on the telephone keypad to send DTMF
tones.
Universal connector
Connect the external KMC-25 speaker/ microphone (op-
tional) here. Otherwise, keep the supplied cover in place.
* : MONITOR and LAMP are arbitrary names chosen for
these buttons. They can be used for any of the auxiliary
functions.
2-3. Programmable keys
The FPU (KPG-49D) enables programmable keys to se-
lect the following functions.
Auto Tel, AUX(only when Voice Scrambler is not se-
lected), DTMF ID (BOT), DTMF ID (EOT), Display Character,
Emergency (only AUX key), Function, Group Down, Group
Up, Home Group, Key Lock, Lamp, Memory (RCL/STO),
Memory (RCL), Memory (STO), Monitor A, Monitor B, Moni-
tor C, Monitor D, Redial, RF Power Lo, Scan, Scan Del/Add,
Scan Temporary Delete, Scrambler (Only when Voice
Scrambler is selected), SP Attenuation (Only MIC switch),
System Down, System Up, TEL Disconnect and none.
These functions the FPU programs to the function keys
are described in the following sections.
