Kenwood TK-480, TK-481 - page 39

ADJUSTMENT

Measurement

Test-

equipment Unit Terminal

Adjustment

Unit Parts Method Specifications/RemarksConditionItem

38

TK-480/481

15. QT DEV 1)SYS – GRP : 4 – ✽

Power meter

Panel ANT Panel

Encoder

TK-480 : 0.75kHz ±0.05kHz

adjustment MIC input : OFF Deviation knob TK-481 : 0.45kHz

Select FQT ✽ ✽ ✽ meter

in tuning mode.

Oscilloscope

Deviation meter filter setting

LPF : 3kHz AG

HPF : 50Hz AF VTVM

De-emphasis : 750µs

PTT : ON

16. DQT DEV 1)SYS – GRP : 4 – ✽

adjustment Select FDQT ✽ ✽ ✽

in tuning mode.

Deviation meter filter setting

LPF : 3kHz

HPF : OFF

PTT : ON

17.LTR DEV 1)SYS – GRP : 4 – ✽TK-480 : 1.00kHz ±0.10kHz : TK-480

adjustment Select FLTR ✽ ✽ ✽ TK-481 : 0.75kHz ±0.05kHz : TK-481

in tuning mode.

Deviation meter filter setting

LPF : 3kHz

HPF : OFF

PTT : ON

18. DTMF DEV 1)SYS – GRP : 4 – ✽TK-480 : 3.00kHz ±0.15kHz : TK-480

adjustment Select DTMF ✽ ✽ ✽ TK-481 : 1.50kHz ±0.10kHz : TK-481

in tuning mode.

Deviation meter filter setting

LPF : 15kHz

HPF : OFF

PTT : ON

19. MSK DEV 1)SYS – GRP : 4 – ✽

adjustment Select FMSK ✽ ✽ ✽

in tuning mode.

Deviation meter filter setting

LPF : 15kHz

HPF : OFF

PTT : ON

20. TONE DEV 1)SYS – GRP : 4 – ✽2.5kHz ±0.1kHz

adjustment Select TONE ✽ ✽ ✽

in tuning mode.

Deviation meter filter setting

LPF : 15kHz

HPF : OFF

PTT : ON

21. BATT 1)SYS – GRP : 4 – ✽After pressing the BATT terminal voltage : 6.2V

detection Select BATT ✽ ✽ ✽ PTT switch, confirm

writing in tuning mode. that one predeter-

PTT : ON mined numeric in

the range 1 to 256

appears and then

press [B] key.

That numeric will be

stored in memory.

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