Kenwood TK-285 Service Manual

Transceiver
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Copyright 2006 by Kenwood Corporation. All rights reserved.
No part of this manual may be reproduced, translated, distributed, or transmitted in any
form or by any means, electronic, mechanical, photocopying, recording, or otherwise, for
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While every precaution has been taken in the preparation of this manual, Kenwood
assumes no responsibility for errors or omissions. Neither is any liability assumed for
damages resulting from the use of the information contained herein. Kenwood reserves
the right to make changes to any products herein at any time for improvement purposes.

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Summary of Contents for Kenwood TK-285

  • Page 1 Kenwood. Disclaimer While every precaution has been taken in the preparation of this manual, Kenwood assumes no responsibility for errors or omissions. Neither is any liability assumed for damages resulting from the use of the information contained herein. Kenwood reserves...
  • Page 2: Table Of Contents

    VHF FM TRANSCEIVER TK-285/(N) SERVICE MANUAL © 2000-6 PRINTED IN JAPAN B51-8530-00(S) 847 CONTENTS Helical antenna GENERAL ................. 2 (T90-0733-05):K, E SYSTEM SET-UP ..............2 (T90-0734-05):(N)M OPERATING FEATURES ............3 Knob (ENC) (K29-5232-03) REALIGNMENT ................ 4 CIRCUIT DESCRIPTION ............6 Knob (VOL) SEMICONDUCTOR DATA .............
  • Page 3: General

    X57-6190-21 240~270MHz SYSTEM SET-UP Merchandise received Frequency range (MHz) RF power Type TX 218~250 5.0W TK-285 K,E RX 217~250 Choose the type of transceiver TX/RX 240~270 5.0W TK-285 (N)M Transceiver programming A personal computer (IBM PC or compatible), programming interface (KPG-36), and programming software (KPG-62D) are required for programming.
  • Page 4: Operating Features

    OPERATING FEATURES 2-3. Key functions 1. Operation Features Trunking mode The TK-285 is a VHF FM Radio designed in both Trunking 2 Rotary encoder Mode and Conventional Mode. Rotate this encoder to select your desired call address (voice calls) ot status (status calls).
  • Page 5 5-2. Connection procedure 1. Connect the TK-285 to the personal computer with the interface cable. 2. When the POWER switch on, user mode can be entered REALIGNMENT immediately.
  • Page 6: Realignment

    3. Set the firmware to be updated by File name item. The KPG-36 connects the universal connector of the TK- 4. Turn the TK-285 power ON with the [A] switch held down. 285 to the computers RS-232C serial port. Hold the switch down until the display changes to "PROG 57600".
  • Page 7: Circuit Description

    TK-285/(N) CIRCUIT DESCRIPTION 1. Overview 3. Receiver System This transceiver is VHF/FM portable transceiver designed 3-1. RF unit to operate in the frequency range of 217 to 250MHz (K, E), An incoming RF signal from the antenna terminal is passed 240 to 270MHz ((N)M).
  • Page 8 TK-285/(N) CIRCUIT DESCRIPTION 3-3. Audio amplifier circuit 3-4. Squelch circuit The demodulated signal from IC12 goes through the mute The output from IC12 enters FM IC again, then passed switch (Q15) and is amplified by IC4 (2/2), high-pass filtered, through a band-pass filter. The noise component output from...
  • Page 9 EXT. is applied to pin 8 of the PLL IC. IC13 Q300 IC25(1/2) The TK-285’s VCO consists of 2VCO and covers a dual COMP LIMIT range of the 261.85~294.85MHz (K,E), 284.85~314.85MHz ((N)M) and the 218~250MHz (K,E), 240~270MHz ((N)M). IC7 (1/2)
  • Page 10 TK-285/(N) CIRCUIT DESCRIPTION 6-2. Low battery warning 6. Control Circuit The battery voltage is monitored by the microprocessor The control circuit consists of microprocessor (IC19) and (IC19). When the battery voltage falls below the voltage set by its peripheral circuits. It controls the TX-RX unit and transfers the Low Battery Warning adjustment, the red LED flashes to data to and from the display unit.
  • Page 11 TK-285/(N) CIRCUIT DESCRIPTION 7-2. Decode 7. Signalling Circuit Low-speed data (QT,DQT) 7-1. Encode The demodulated signal from the IF IC (IC12) is amplified Low-speed data (QT,DQT) by IC4 (2/2) and passes through a low-pass filter (IC11) to Low-speed data is output from pin 1 of the CPU. The signal remove audio components.
  • Page 12 TK-285/(N) CIRCUIT DESCRIPTION / SEMICONDUCTOR DATA 9. Optional Board Terminal SEMICONDUCTOR DATA Terminals for mounting the option board are provided at Microprocesser : 30620M8-394GP the bottom edge of the TX-RX unit. The table below shows the (TX-RX UNIT : IC19) correspondence between the board and terminals.
  • Page 13: Semiconductor Data

    TK-285/(N) SEMICONDUCTOR DATA Port PLL System : SA7025DK (TX-RX Unit : IC14) Function Name Block diagram Not used. 50~59 A9~A18 Flash memory address bus. Flash memory address bus. GND. 63~70 A0~A7 Flash memory address bus. MONI Monitor switch input. Encoder pulse input 4.
  • Page 14: Description Of Components

    TK-285/(N) DESCRIPTION OF COMPONENTS DISPLAY UNIT (X54-3210-13) Ref. No. Use/Function Operation/Condition Ref. No. Use/Function Operation/Condition IC300 Audio power amplifier Transistor IF W/N switch sets to on when Wide IC301 Counter /Key scan Transistor Ripple filter Q300 DC switch / INT MIC on/off...
  • Page 15: Parts List

    TK-285/(N) PARTS LIST L: Scandinavia K: USA P: Canada ∗ New Parts. indicates safety critical components. Y: PX (Far East, Hawaii) T: England E: Europe Parts without Parts No. are not supplied. Y: AAFES (Europe) X: Australia M: Other Areas Les articles non mentionnes dans le Parts No.
  • Page 16 TK-285/(N) PARTS LIST DISPLAY UNIT (X54-3210-13) TX-RX UNIT (X57-619X-XX) TX-RX UNIT (X57-619X-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts Q309 2SC4617(S) TRANSISTOR L300,301 L92-0141-05 FERRITE CHIP L302,303 L92-0138-05 FERRITE CHIP Q310...
  • Page 17 TK-285/(N) PARTS LIST TX-RX UNIT (X57-619X-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts C64,65 CC73GCH1H680J CHIP C 68PF C132 CC73GCH1H220J CHIP C 22PF CK73GB1C104K CHIP C 0.10UF C133 CK73GB1E153K CHIP C 0.015UF K...
  • Page 18 TK-285/(N) PARTS LIST TX-RX UNIT (X57-619X-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts C204 CC73GCH1H330J CHIP C 33PF C256,257 CK73HB1C103K CHIP C 0.010UF K C205 CK73GB1H102K CHIP C 1000PF C259 CK73GB1E103K CHIP C 0.010UF K...
  • Page 19 TK-285/(N) PARTS LIST TX-RX UNIT (X57-619X-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts L92-0138-05 FERRITE CHIP RK73GB1J473J CHIP R J 1/16W L40-3978-67 SMALL FIXED INDUCTOR(39NH) (N)M RK73GB1J472J CHIP R 4.7K J 1/16W...
  • Page 20 TK-285/(N) PARTS LIST TX-RX UNIT (X57-619X-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts RK73GB1J103J CHIP R J 1/16W R218 RK73GB1J220J CHIP R J 1/16W RK73GB1J183J CHIP R J 1/16W R219 RK73GB1J470J...
  • Page 21 TK-285/(N) PARTS LIST TX-RX UNIT (X57-619X-XX) SUB UNIT (X58-4730-XX) TX-RX UNIT (X57-619X-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts R415,416 RK73GB1J474J CHIP R 470K J 1/16W 2SK1824 2SC5108(Y) TRANSISTOR 1SR154-400 DIODE...
  • Page 22 TK-285/(N) PARTS LIST TX-RX UNIT (X57-619X-XX) SUB UNIT (X58-4730-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts RK73HB1J104J CHIP R 100K J 1/16W R5,6 RK73HB1J391J CHIP R J 1/16W RK73HB1J334J CHIP R...
  • Page 23: Exploded View

    TK-285/(N) EXPLODED VIEW Display unit (A/2) A NUT :N14-0569-04 B M2.6x4 :N30-2604-46 C M2.6x10 :N30-2610-46 D M2.6x6 :N67-2606-46 :N79-2025-46 F M2x5 :N83-2005-46 IC100 Sub unit TX-RX unit 24 61 Display unit (B/2) (CHASSIS) S/NO label (ESN) S/NO label Parts with the exploded numbers larger than 700 are not supplied.
  • Page 24: Packing

    TK-285/(N) PACKING 62 Battery assy (W09-0900-35) E type only Warranty card K type only 43 Carton board (H13-1072-04) K,(N)M type only 7 Instrution manual (B62-1264-00) 57 Screw set (N99-2004-05) 3 Cap (B09-0363-03) 42 Packing fixture (H12-3014-02) ANT Helical antenna (T90-0733-05):K,E...
  • Page 25: Adjustment

    TK-285/(N) ADJUSTMENT Test Equipment Required for Alignment Test Equipment Major Specifications Standard Signal Generator Frequency Range 217 to 270MHz (SSG) Modulation Frequency modulation and external modulation. Output -127dBm/0.1µV to greater than -47dBm/1mV Power Meter Input Impedance 50Ω. Operation Frequency 217 to 270MHz or more.
  • Page 26 ADJUSTMENT • Panel tuning Repair Jig (Chassis) Use jig (part No.: W05-0825-00) for repairing the TK-285. The jig facilitates the voltage check and protects the module when the voltage on the flow side of the TX-RX unit is checked 2: RED (RX AF OUTPUT) during repairs.
  • Page 27: Test Mode

    TK-285/(N) ADJUSTMENT Frequency and signalling Test Mode The set has been adjusted for the frequencies shown in the Test mode operating features following table. When required. re-adjust them following the This transceiver has a test mode. To enter test mode, press adjustment procedure to obtain the frequencies you want in [B] key and turn power on.
  • Page 28 TK-285/(N) ADJUSTMENT • Transceiver tuning LCD display (Tuning mode) (To place transceiver in tuning mode) FREQ Channel appears on LCD. Set channel according to tuning requirements. Adjustment item Adjustment (1~256) LCD display (Test mode) Panel Tuning Mode (K, E type)
  • Page 29 TK-285/(N) ADJUSTMENT Common Section Measurement Adjustment Specifications/ Item Condition Remark Test equipment Unit Terminal Unit Parts Method 1. Setting 1) BATT terminal voltage:7.5V 2) SSG Standard modulation MOD:1kHz, DEV:1.5kHz 2. VCO lock [Panel Test Mode] voltage 1) CH-Sig:2-1 Power meter...
  • Page 30 TK-285/(N) ADJUSTMENT Transmitter Section [Panel Tuning Mode except when Panel TEST Mode is specified.] Measurement Adjustment Specifications/ Item Condition Remark Test equipment Unit Terminal Unit Parts Method 7. DQT Balance 1) Adj item [BAL] Power meter Panel Panel Encoder Make the Adjust Adjust [∗∗∗]...
  • Page 31 TK-285/(N) ADJUSTMENT Transmitter Section [Panel Tuning Mode except when Panel TEST Mode is specified.] Measurement Adjustment Specifications/ Item Condition Remark Test equipment Unit Terminal Unit Parts Method ±0.05kHz 14.TONE 1) Adj item [TONE] Power meter Panel Panel Encoder 1.45kHz Deviation Adjust [∗∗∗]...
  • Page 32 TK-285/(N) ADJUSTMENT Receiver Section [Panel Tuning Mode except when Panel TEST Mode is specified.] Measurement Adjustment Specifications/ Item Condition Remark Test equipment Unit Terminal Unit Parts Method 4. RSSI 1) Adj item [LRSI] Panel Panel Encoder After input (Low) Adjust [∗∗∗]...
  • Page 33: Terminal Function

    TK-285/(N) TERMINAL FUNCTION CN No. Pin No. Name I/O Function CN No. Pin No. Name I/O Function TX-RX UNIT (X57-619X-XX): TX-RX section PTT signal output. Not use. Power input after passing through LCD driver chip select input. the fuse. Audio mute signal input.
  • Page 34: Pc Board Views

    TK-285/(N) PC BOARD VIEW DISPLAY UNIT (X54-3210-13) Component Side View DISPLAY UNIT (X54-3210-13) X54-3210-13 (B/2) S301 S302 S303 J72-0517-22 LAMP LCD ASSY CN302 ∗ D301 X54-3210-13 (A/2) – J72-0517-22 Component side Pattern 1 Pattern 2 Pattern 3 Pattern 4 Foil side...
  • Page 35 TK-285/(N) PC BOARD VIEW DISPLAY UNIT (X54-3210-13) Foil Side View CN303 X54-3210-13 (B/2) J72-0517-22 DISPLAY UNIT (X54-3210-13) D321 R300 R302 R304 CN301 CN300 R303 R305 R301 C302 R311 R312 Q300 R306 CP300 L309 R325 R338 C331 C328 D320 R324 Q301...
  • Page 36 TK-285/(N) PC BOARD VIEW DISPLAY UNIT (X54-3210-13) Component Side + Foil Side View CN303 X54-3210-13 (B/2) S301 S302 S303 J72-0517-22 LAMP DISPLAY UNIT (X54-3210-13) D321 R300 R302 LCD ASSY R304 CN301 R303 CN300 R305 CN302 R301 C302 R312 R311 Q300...
  • Page 37: Tx-Rx Unit (X57-619X-Xx)

    TK-285/(N) PC BOARD VIEW TX-RX UNIT (X57-619X-XX) Component Side View 0-11: K, E, 0-21: (N)M TX-RX UNIT (X57-619X-XX) MONI R267 C244 LAMP C247 IC100 R271 C223 C224 R110 X57-619X-XX R258 R415 C138 C101 J72-0734-12 C217 C237 C140 R298 C123 C200...
  • Page 38 TK-285/(N) PC BOARD VIEW TX-RX UNIT (X57-619X-XX) Foil Side View 0-11: K, E, 0-21: (N)M TX-RX UNIT R100 (X57-619X-XX) C246 IC16 C242 R114 C227 R109 R304 C405 C136 C119 R123 R305 C256 IC17 R116 R253 R295 C120 X57-619X-XX CN10 C215...
  • Page 39 TK-285/(N) PC BOARD VIEW TX-RX UNIT (X57-619X-XX) TX-RX UNIT (X57-619X-XX) Component Side + Foil Side View 0-11: K, E, 0-21: (N)M IC16 R100 MONI R267 C246 C244 LAMP C247 IC100 R271 C242 R114 C227 R109 R304 C119 C405 R116 R305...
  • Page 40: Schematic Diagram

    TK-285/(N) SCHEMATIC DIAGRAM SCN LO Note : Component marked with a dot ( ) are parts of pattern1.
  • Page 41: Block Diagram

    TK-285/(N) TK-285/(N) TK-285/(N) TK-285/(N) BLOCK DIAGRAM LEVEL DIAGRAM KNB-16A/17A (Ni-Cd BATTERY) / KPG-36 (PROGRAMMING INTER- FACE CABLE) / KSC-19 (CHARGER) KNB-16A KNB-17A KPG-36 External View External View External View KNB-16A KNB-17A KSC-19 External View Circuit Diagram Circuit Diagram Discharge pin side...
  • Page 42 TK-285/(N) KMC-25 (SPEAKER MICROHONE) Circuit Diagram External View Specifications Microphone Impedance ......2kΩ Sensitivity ........ -65dB±4.0dB at 1kHz Speaker Impedance ......16Ω Input ........0.5W Maximum input ......1.5W Dimensions ........62W x 81 H x 29 D (mm) Weight (With plug cord) ....Approx. 0.17kg...
  • Page 43: Specifications

    KENWOOD ELECTRONICS TECHNOLOGIES(S) PTE LTD. KENWOOD ELECTRONICS U.K. LIMITED Sales Marketing Division KENWOOD House, Dwight Road, Watford, Herts., WD1 8EB United Kingdom 1 Ang Mo Kio Street 63, Singapore 569110 KENWOOD ELECTRONICS EUROPE B.V. Amsterdamseweg 37, 1422 AC Uithoorn, The Netherlands...

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