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Two-Way Radio
Kenwood
TK-480, TK-481
SCHEMATIC DIAGRAM TK-480/481
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SCHEMATIC DIAGRAM
TK
-480/481
Note : Components marked with a dot (ยท) are parts of pattern 1.
Contents
Main
800MHz/900MHz FM TRANSCEIVER
TK-480/481
SERVICE MANUAL
CONTENTS
REVISED II
2
GENERAL / SYSTEM SET-UP
INTRODUCTION
SYSTEM SET-UP
SCOPE OF THIS MANUAL
ORDERING REPLACEMENT PARTS
TK-480/481
1.Operation Features
2. Transceiver Controls and Indicators
2-1. Physical Layout
2-2. Panel controls
4
Auto TEL
AUX
DTMF ID (BOT)
DTMF ID (EOT)
P
6
3-3. Drop-out delay time (Scan resume time)
3-4. Dwell time
3-5. System/Group revert
4. Details of Features
4-1. Time-out timer
4-2. Sub LCD
4-3. Selective Call Alert LED
4-4. PTT ID
TK-480/481
4-5. Radio password
4-6. Battery Warning
4-7. Minimum Volume
4-8. Call indicator
5.Option Signalling
5-1. DTMF
6.
AND/OR
Auto Reset
Page
7.Audible User Feedback Tones
11
7-16. Intercept Tone
7-17. Delay Tone
7-18. Proceed Tone
OPERATING FEATURES / REALIGNMENT
REALIGNMENT
1.Modes
2.How to Enter Each Mode
3.Panel Test Mode
REALIGNMENT
Fig. 1
5.PC Mode
5-1. Preface
5-2. Connection procedure
REALIGNMENT
Fig. 2
Notes:
6-4. Function
Note:
1.Overview
Fig. 2 Receiving system
Fig. 1 Frequency configuration
2.Circuit Configuration by Frequency
3.Receiver System
4.Transmitter System
4-1. Microphone amplifier
16
Fig. 6 Microphone amplifier
Fig. 7 Drive and final amplifier and APC circuit
4-2. Drive and Final amplifier
4-3. APC circuit
6.Control Circuit
Fig. 9 Memory circuit
6-1. Memory circuit
Flash Memory
EEPROM
7.Signalling Circuit
7-1. Encode Low-speed data (QT,DQT,LTR)
High-speed data (DTMF)
MSK
19
8.Power Supply Circuit
Fig. 14 Power supply circuit
9.Optional Board Terminal
Microprocessor : 30622M8A-4F9GP (TX-RX Unit IC15)
20
Pin function
21
Shift Register 1 : BU4094BCFV (TX-RX Unit IC18)
VCO System : KCH31, KCH32 (TX-RX Unit IC14)
Circuit diagram
Shift Register 2 : BU4094BCFV (TX-RX Unit IC19)
22
PLL System : SA7025DK (TX-RX Unit IC11)
Fractional compensation current setting; resistor to V
Pin No.
Block diagram
Pin description
DESCRIPTION OF COMPONENTS
DISPLAY UNIT (X54-3210-XX)
TX-RX UNIT (X57-5630-XX)
24
TK-480/481
DISPLAY UNIT (X54-3210-XX) -10 : K -11 : K2
25
TX-RX UNIT (X57-5630-XX) -10 : TK-480 -11 : TK-481
26
Page
28
Page
EXPLODED VIEW
PACKING
32
Test Equipment Required for Alignment
The following parts are required for adjustment 1. Antenna connector adapter
Note
2. Universal connector
Caution
Repair Jig (Chassis)
How to Remove the Flat Cable
Panel tuning
PC tuning
34
Test Mode
Test mode operating features
Controls
LCD indicator
LED indicator
FREQ 1
IC30 IC14 VC
11
Transceiver tuning (To place transceiver in tuning mode)
System appears on LCD. Set system according to tuning requirements.
Transmitter Section
Common Section
Page
Page
Receiver Section
TERMINAL FUNCTION
PC BOARD VIEWS TK-480/481
*
DISPLAY UNIT (X54-3210-XX) -10 : K -11 : K2 Component side view
A B C D E F G H I J K L M N O P Q R S 1 2 3 4 5 6 7 8 9 10 11 12 13 14
TK-480/481
DISPLAY UNIT (X54-3210-XX) -10 : K -11 : K2 Foil side view
Component side Foil side
Pattern 1 Pattern 2 Pattern 3 Pattern 4
IC300 7I IC301 8G Q300 5P Q301 6H Q302 11R Q303 10R Q304 9H Q305 9H
PC BOARD VIEWS TK-480/481
DISPLAY UNIT (X54-3210-XX) -10 : K -11 : K2 Component side view + Foil side
Component side Foil side
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Connect 1 and 4
IC300 7K IC301 8N Q300 5D Q301 6L Q302 11B Q303 10B Q304 9L Q305 9L
TK-480/481
47 48
TX-RX UNIT (X57-5630-XX) -10 : TK-480 -11 : TK-481 Component side view
PC BOARD VIEW TK-480/481
49 50
TX-RX UNIT (X57-5630-XX) -10 : TK-480 -11 : TK-481 Foil side view
TK-480/481
51 52
TX-RX UNIT (X57-5630-XX) -10 : TK-480 -11 : TK-481 Component side view + Foil side
SCHEMATIC DIAGRAM TK-480/481
Page
LEVEL DIAGRAM (TK-480)
TX Section
RX Section
*
LEVEL DIAGRAM (TK-481)
*
RX Section TX Section
KNB-16A/17A (Ni-Cd BATTERY) / KPG-36 (PROGRAMMING INTERFACE CABLE) / KSC-19 (CHARGER)
KNB-16A KNB-17A External View External View
KNB-16A Specifications
KNB-17A Specifications
KPG-36 External View
SPECIFICATIONS
General
Receiver
Transmitter
Page
KENWOOD CORPORATION