Kenwood 762G Service Manual
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Kenwood 762G Service Manual

Vhf fm transceiver
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Document Copyrights
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
any purpose without the prior written permission of 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
the right to make changes to any products herein at any time for improvement purposes.

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Summary of Contents for Kenwood 762G

  • 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 Cabinet (Upper) (A01-2165-13) Panel assy (A62-0642-03) Key top (K29-5343-02) Microphone (T91-0597-15) TK-762G (K) Cabinet (Upper) (A01-2165-13) Panel assy (A62-0731-03) Key top (K29-5344-02) Please use this manual in place of the service manual (preliminary version), B51-8497-00. We have added the information on the circuit description, specifications, and K2 version specifications to the service...

  • Page 3: Table Of Contents

    DISPLAY UNIT (X54-3270-10) : TK-760G ..54 nel safety : • DO NOT transmit if someone is within two feet (0.6 DISPLAY UNIT (X54-3280-10) : TK-762G ..55 meter) of the antenna. PLL/VCO (X58-4670-XX) ........56 • DO NOT transmit until all RF connectors are verified se- cure and any open connectors are properly terminated.

  • Page 4: General

    Your KENWOOD dealer can help you select an antenna sys- tem that will best serve your particular needs. 3-2. Testing 5-2.

  • Page 5: System Set-Up

    Are you using the external speaker? External speaker (Option) See page 20. See page 21. KCT-19 KCT-18 Are you using ignition sense cable? Accessory connector cable Ignition sense cable (Option) (Option) : You can install either KCT-19 or KCT-20 to the Delivery TK-760G/762G transceiver...

  • Page 6: Operating Features

    Insert the microphone plug into this connector. Displays the selected channel MON, A, D/A, , and SCN keys (TK-760G) MON, , , and A keys (TK-762G) number. These are PF (Programmable Function) keys. Press each key to activate its auxiliary function.

  • Page 7: Operating Features

    *3 : This function is available for M market models only. If this key is pressed, "AUX" icon lights on the display and *4 : The code for the TK-762G transceiver is not selectable. AUX port which is inside of the transceiver turns to the high You can transmit only one 2-Tone code, which is pre- level.
  • Page 8 TK-760G/762G OPERATING FEATURES • Display character (TK-760G only) • Public address This key switches the LCD display between the group Public address amplifies the microphone audio, and out- and channel number and the group and channel name. puts it through a PA speaker. PA is activated by pressing this key.
  • Page 9 TK-760G/762G OPERATING FEATURES SCAN start condition 3) Selected channel The transceiver reverts to the channel before scanning or One or more non-priority channels must be added to all the channel that you changed during scan. channels that can be scanned. The transceiver must be in 4) Last called channel normal receive mode (PTT off).
  • Page 10 TK-760G/762G OPERATING FEATURES Off hook decode AND/OR If the Off hook decode function has been enabled, re- You can select AND or OR for option signalling match moving and replacing the microphone on the hook has no conditions. effect for decoding QT/DQT and option signalling.
  • Page 11 TK-760G/762G OPERATING FEATURES / REALIGNMENT Busy tone REALIGNMENT Sounds in conventional mode, when busy channel lock- out is functioning. You can select yes or no for the optional 1. Modes feature's warning tone. User mode Group call tone Sounds when a group call with the correct DTMF/2-tone...

  • Page 12: Realignment

    • The data stored in the personal computer must match 6-3. Programming model type when it is written into the flash memory. • Change the TK-760G/762G to PC mode, then attach the 1. Start up the programming software (KPG-56D), select interface cable.
  • Page 13 Disable in the Programming soft- Slave TK-260G TK-260G TK-760G TK-760G TK-760G TK-260G TK-270G ware (KPG-56D). TK-270G TK-270G TK-762G TK-762G TK-762G TK-270G • When programming the firmware, it is recommend to Master copy the data from the floppy disk to your hard disk be- TK-760G fore you update the radio firmware.
  • Page 14 TK-760G/762G REALIGNMENT Note : 9. Channel Setting Mode This mode (self programming mode) cannot be set when Each channel can be setup in its action mode by using it has been disabled with the FPU. the panel keys. • Pressing [MON] when "SELF" is diaplyed, sets channel setting mode.
  • Page 15 TK-760G/762G REALIGNMENT No. Function Choices Display Remarks No. Function Choices Display Remarks Step STP__250 Display when an item High power PWR_H___ Default frequency 2.5kHz~1MHz STP_1000 is selected or when a power Low power PWR_L___ step is changed 10 Wide/ Wide WIDE____ (about 0.5 seconds)
  • Page 16 No function KEY1_OFF Default (TK-760G) (TK-760G) Volume down KEY1__1_ [MON] Volume up KEY1__2_ (TK-762G) Talk around KEY1__3_ Auxiliary KEY1__4_ Dispaly character KEY1__5_ TK-762G cannot be selected Home channel KEY1__7_ Channel down KEY1__8_ Channel up KEY1__9_ Key lock KEY1__10 Public address KEY1__12...
  • Page 17 Horn alert KEY1__14 Horn alert KEY3__14 Selectable QT KEY1__15 M destination only Selectable QT KEY3__15 M destination only 2-tone encode KEY1__16 TK-762G cannot be selected select 2-tone encode KEY3__16 Monitor A KEY1__17 Default (TK-762G) select Monitor B KEY1__18 Monitor A...
  • Page 18 Public address CUP___12 Horn alert SCN___14 Horn alert CUP___14 Selectable QT SCN___15 M destination only Selectable QT CUP___15 M destination only 2-tone encode SCN___16 TK-762G cannot be selected select 2-tone encode CUP___16 Monitor A SCN___17 select Monitor B SCN___18 Monitor A CUP___17...
  • Page 19 VUP___14 16 Off hook Enable H_D__ENA Selectable QT VUP___15 M destination only decode Disable H_D__DIS Default TK-762G cannot be selected 17 Off hook Enable H_H__ENA 2-tone encode VUP___16 horn alert Disable H_H__DIS Default select 18 Time out OFF, 15~600/ TOT_180_...
  • Page 20 [D/A]/[ ] Others 47 Panel Enable PTM__ENA Default test/ Not used for TK-762G 11. Memory Reset Mode (TK-760G only) panel Disable PTM__DIS You can clear all settings you made in self programming tuning mode, or you can return to the original display.
  • Page 21 TK-760G/762G INSTALLATION 1-2. KCT-19 Accessory Port Function 1. Accessory Connection Cable Name Function Note (KCT-19 : Option) (A) (B,C,D,E) The KCT-19 is an accessory connection cable for con- Serial control data input necting external equipment. The connector has 15 pins and Data channel control/ the necessary signal lines are selected for use.

  • Page 22: Installation

    TK-760G/762G INSTALLATION 2. Accessory Terminal (TX-RX Unit) 3. Ignition Sense Cable (KCT-18 : Option) 2-1. External Connector Accessory Terminal Method The KCT-18 is an optional cable for enabling the ignition function. The ignition function lets you turn the power to the...
  • Page 23 Horn Alert or AUX-A Enable Disable 5. Fitting the Control Panel Upside Down on/off The TK-760G/762G control panel can be fitted upside Disable Disable Power cannot down, so the transceiver can be mounted with its internal be turned on speaker (in the upper half of the case) facing down in your Table 1 R134 and R135 setup chart car.
  • Page 24 TK-760G/762G INSTALLATION 2. Fold the flat cable ( ) in the opposite direction ( 6. External Speaker 3. Rotate the control section ( ) 180 degrees ( 6-1. KES-3 : Option 4. Insert the flat cable into the control section connector, The KES-3 is an external speaker for the 3.5-mm-diam-...

  • Page 25: Circuit Description

    TK-760G/762G CIRCUIT DESCRIPTION IF Amplifier Frequency Configuration The first IF signal is amplified by Q13, and the enters IC5 The receiver utilizes double conversion. The first IF is (FM processing IC). The signal is heterodyned again with a 49.95MHz and the second IF is 450kHz. The first local oscil- second local oscillator signal within IC5 to create a 450kHz lator signal is supplied from the PLL circuit.

  • Page 26: Circuit Description

    VCO to control the oscillator frequency. (See Fig. 6) CONTORL UNIT IC508 IC507 IC13 AUDIO The TK-760G/762G has VCO in a Sub-unit (A1) housed in AF PA PROCE. CONV. a solid shielded case and connected to the TX-RX unit through CN101. DTMF The operating frequency is generated by Q103 in trans- mit mode and Q101 in receive mode.
  • Page 27 TK-760G/762G CIRCUIT DESCRIPTION PLL/VCO IC3 : PLL IC Q103 TX VCO RF AMP 5kHz/6.25kHz Q106 BUFF D102,104 Phase Charge Q101 comparator pump DATA RX VCO Q102, 104,105 T/R SW 5kHz/6.25kHz D101,103 16.8MHz Fig. 6 PLL circuit Unlock Circuit Transmitter System...
  • Page 28 5) Controls the PLL (IC3). Key Matrix Circuit 6) Controls the D/A converter (IC6) and adjusts the volume, The TK-760G/762G front panel has function keys. Each modulation and transmission power. of them is connected to a cross point of a matrix of the KIN0 to KOUT2 ports of the microprocessor.
  • Page 29 TK-760G/762G CIRCUIT DESCRIPTION Encode D/A Converter The QT and DQT signals are output from TO of the CPU The D/A converter (IC6) is used to adjust TONE and MO (IC502) and summed with the external pin DI line by the...

  • Page 30: Semiconductor Data

    TK-760G/762G SEMICONDUCTOR DATA Microprocessor : 30622M4102GP (TX-RX Unit IC502) Terminal function Pin No. Name Function Pin No. Name Function EMGT External MIC control. Mobile MIC : H Pull up. DTMF DTMF/2TONE/BEEP output. – 2TONE decode pulse input. HOLD Not used.

  • Page 31: Semiconductor Data

    TK-760G/762G SEMICONDUCTOR DATA Shift Register : BU4094BCFV LCD Driver : LC75833W Terminal function (TX-RX unit IC510) (Display Unit IC801 : TK-762G only) Pin No. Port Name Function Block diagram Wide/Narrow SW. Narrow : H MUTE MIC mute (M models only). Mute : H MIC/LCD backlight control.

  • Page 32: Description Of Components

    KOUT 0 prevention D505 Reverse current KOUT 1 TX-RX Unit (X57-5950-XX) prevention -10 : TK-760G K -11 : TK-762G K -12 : TK-760G K2 -13 : TK-762G K2 -21 : TK-760G M D506 Voltage discharger When powering down D507 Reverse current KOUT 2 Ref.

  • Page 33: Description Of Components

    TK-760G/762G DESCRIPTION OF COMPONENTS Ref. No. Use/Function Operation/Condition Ref. No. Use/Function Operation/Condition Shift/Store register HNC, 8RC, 8TC, SPMUTE, RX, DC switch Active while PS voltage is more PA/LI, AUX5, AUX6 than 20V IC10 5V AVR 5C (TX/RX) RF amplifier Predrive...

  • Page 34: Parts List

    TK-760G/762G PARTS LIST CAPACITORS CC 45 TH 1H 220 J • Capacitor value Color* CC45 010 = 1pF 0 = 22pF 100 = 10pF 1 = Type … ceramic, electrolytic, etc. 4 = Voltage rating Multiplier 101 = 100pF 2 = Shape … round, square, ect.

  • Page 35: Parts List

    Les articles non mentionnes dans le Parts No. ne sont pas fournis. Y : AAFES (Europe) X: Australia M: Other Areas Teile ohne Parts No. werden nicht geliefert. TK-760G/762G DISPLAY UNIT (X54-3270-10) : TK-760G, DISPLAY UNIT (X54-3280-10) : TK-762G Desti- Desti- Ref. No. Address Parts No.
  • Page 36 CK73GB1H103K CHIP C 0.010UF TX-RX UNIT (X57-5950-XX) C92-0004-05 CHIP-TAN 1.0UF 16WV -10 : TK-760G K -11 : TK-762G K -12 : TK-760G K2 C100 CK73GB1H102K CHIP C 1000PF -13 : TK-762G K2 -21 : TK-760G M C101 CC73GCH1H040C CHIP C 4.0PF...
  • Page 37 TK-760G/762G PARTS LIST TX-RX UNIT (X57-5950-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation C172 CE04EW1E471M ELECTRO 470UF 25WV C503 CK73GB1H471K CHIP C 470PF C173 CK73GB1C104K CHIP C 0.10UF C504...
  • Page 38 TK-760G/762G PARTS LIST TX-RX UNIT (X57-5950-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation C582 CK73GB1C473K CHIP C 0.047UF L40-3375-34 SMALL FIXED INDUCTOR (33NH/8) C583 C92-0566-05 CHIP-TAN 10UF 6.3WV L34-4473-05...
  • Page 39 TK-760G/762G PARTS LIST TX-RX UNIT (X57-5950-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation RK73GB1J223J CHIP R 1/16W R107 RK73GB1J473J CHIP R 1/16W RK73GB1J220J CHIP R 1/16W R108 RK73GB1J271J CHIP R...
  • Page 40 TK-760G/762G PARTS LIST TX-RX UNIT (X57-5950-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation R175 RK73GB1J682J CHIP R 6.8K 1/16W R550 RN73GH1J683D CHIP R 1/16W R176 RK73GB1J104J CHIP R 100K...
  • Page 41 TK-760G/762G PARTS LIST TX-RX UNIT (X57-5950-XX) PLL/VCO (X58-4670-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation R619 RK73GB1J104J CHIP R 100K 1/16W IC503 RH5VL42C IC (REGULATOR) R620,621 RK73GB1J103J CHIP R...
  • Page 42 TK-760G/762G PARTS LIST PLL/VCO (X58-4670-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation C107 CC73GCH1H080D CHIP C 8.0PF C110 CC73GCH1H040B CHIP C 4.0PF C110 CC73GCH1H120J CHIP C 12PF C111 CC73GCH1H040B CHIP C 4.0PF...
  • Page 43 TK-760G/762G EXPLODED VIEW (TK-760G) Parts with the exploded numbers larger than 700 are not supplied.

  • Page 44: Exploded View

    TK-760G/762G EXPLODED VIEW (TK-762G) Parts with the exploded numbers larger than 700 are not supplied.

  • Page 45: Packing

    TK-760G/762G PACKING 45 Microphone 13 DC cord (T91-0597-15) : K,K2 33 Protection bag (E30-3339-05) (H25-0720-04) 19 Fuse (10A) (F51-0016-05) x 2 5 Cap (B09-0235-05) 38 Bracket (J29-0627-23) 32 Inner packing case (H12-1391-03) 36 Holder (J19-1584-05) 42 Screw set (N99-0395-05) 31 Polystyrene foamed fixture (R)
  • Page 46 Channel No. Signalling No. • Frequency (MHz) Press [SCN], now in tuning mode. Use [D/A] button to Channel TK-760G/762G (K) TK-760G/762G (K2) TK-760G (M) write tuning data through tuning modes, and [CH ] to adjust tuning requirements (1 to 256 appears on LCD).

  • Page 47: Adjustment

    TK-760G/762G ADJUSTMENT Tuning Mode Display Function name FREQ_ _XX Frequency adj. HPOW_XXX H.POW_XXX H.P.OW_XXX H.P.O.W_XXX H.P.O.W._XXX H.P.O.W._.XXX RF high power Hi power (L) Hi power (L') Hi power (C) Hi power (H') Hi power (H) [D/A] [D/A] [D/A] [D/A] [D/A] LPOW_XXX L.POW_XXX...
  • Page 48 TK-760G/762G ADJUSTMENT Test Equipment Required for Alignment Test Equipment Major Specifications 1. Standard Signal Generator Frequency Range 136 to 174MHz (SSG) Modulation Frequency modulation and external modulation Output –127dBm/0.1 V to greater than –7dBm/100mV 2. Power Meter Input Impedance Operation Frequency...
  • Page 49 Repair Jig • Chassis Use jig (Part No. : A10-4010-02) for repairing the TK- 760G/762G. The jig facilitates the voltage check when the voltage on the component side TX-RX unit is checked during repairs. • Extension cable Part No.

  • Page 50: Receiver Section

    TK-760G/762G ADJUSTMENT Common Section Since the TK-762G cannot be tuned from the panel, the FPU (KPG-56D) should be used for adjustment. Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment 1. PLL lock 1) Set test mode TX-RX CV TC106 7.5V K,M...
  • Page 51 TK-760G/762G ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment 3. Squelch 3 1) Set test mode Rear Front CH / Adjust to the • Wide Select “SQL3” in tuning mode. panel panel squelch threshold “S.QL3”...
  • Page 52 TK-760G/762G ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment 6. QT check 1) Set test mode Rear CH : CH1 - Sig4 panel SSG MOD AF VTVM INT : 3kHz (Wide), 1.5kHz (Narrow) Distortion (EXT.SP) EXT : 151.4Hz...
  • Page 53 TK-760G/762G ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment 3) “L.P.O.W” Power meter Rear Front CH / 5.0W 0.5W PTT : ON panel panel Adjust [ *** ] 4) “L.P.O.W.” PTT : ON Adjust [ *** ] 5) “L.P.O.W._.”...
  • Page 54 TK-760G/762G ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment 8. MIC 1) Set test mode Power meter Rear Check 3kHz 0.2kHz (Wide) seisitivity CH : CH1 - Sig1 Deviation panel 1.5kHz 0.05kHz (Narrow) check AG : 1kHz/5mV...
  • Page 55 TK-760G/762G TK-760G/762G PC BOARD VIEWS DISPLAY UNIT (X54-3270-10) : TK-760G DISPLAY UNIT (X54-3270-10) : TK-760G Component side view Foil side view C806 C806 C807 C807 R808 R808 R809 R809 CN801 CN801 C801 C801 R801 R801 C802 C802 C805 C803 C805...

  • Page 56: Display Unit (X54-3280-10) : Tk-762G

    TK-760G/762G PC BOARD VIEWS DISPLAY UNIT (X54-3280-10) : TK-762G DISPLAY UNIT (X54-3280-10) : TK-762G PLL/VCO (X58-4670-XX) -10 : K,M -11 : K2 Component side view Component side view Foil side view J72-0676-02 C115 C119 L111 L109 CN101 L103 C104 L112...
  • Page 57 TK-760G/762G TX-RX UNIT (X57-5950-XX) (A/2) Component side view PC BOARD VIEW -10 : TK-760G K -11 : TK-762G K -12 : TK-760G K2 -13 : TK-762G K2 -21 : TK-760G M Ref. No. Address Ref. No. Address Ref. No. Address Ref.
  • Page 58 TK-760G/762G TX-RX UNIT (X57-5950-XX) (A/2) Foil side view PC BOARD VIEW -10 : TK-760G K -11 : TK-762G K -12 : TK-760G K2 Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref.

  • Page 59: Tx-Rx Unit (X57-5950-Xx) (A/2)

    Ref. No. Address Ref. No. Address Component side view + Foil side IC12 D28 10C -10 : TK-760G K -11 : TK-762G K -12 : TK-760G K2 -13 : TK-762G K2 -21 : TK-760G M IC13 IC14 D18 12C Component side...

  • Page 60: Tx-Rx Unit (X57-5950-Xx) (B/2)

    TK-760G/762G PC BOARD VIEWS TX-RX UNIT (X57-5950-XX) (B/2) Component side view -10 : TK-760G K -11 : TK-762G K -12 : TK-760G K2 -13 : TK-762G K2 -21 : TK-760G M D512 J72-0677-02 B/2 D511 R566 C543 L501 R567 R559...
  • Page 61 TK-760G/762G PC BOARD VIEW TX-RX UNIT (X57-5950-XX) (B/2) Component side view + Foil side -10 : TK-760G K -11 : TK-762G K -12 : TK-760G K2 -13 : TK-762G K2 -21 : TK-760G M J72-0677-02 B/2 D512 D511 R550 R501...

  • Page 62: Schematic Diagram

    TK-760G SCHEMATIC DIAGRAM Note : Components marked with a dot (·) are parts of patterun 1.
  • Page 63 TK-762G SCHEMATIC DIAGRAM Note : Components marked with a dot (·) are parts of patterun 1.

  • Page 64: Block Diagram

    TK-760G/762G TK-760G/762G TK-760G/762G BLOCK DIAGRAM...

  • Page 65: Level Diagram

    TK-760G/762G TK-760G/762G LEVEL DIAGRAM Receiver Section Center Frequency 49.95MHz 450kHz Audio Frequency To make measurements in the RF section, connect the RF level meter. In the RF section, use a 0.01 F coupling capacitor. (The display shows the SSG input value required to obtain 12dB SINAD.)

  • Page 66: Terminal Function

    TK-760G/762G TERMINAL FUNCTION CN1 (TX-RX Unit) CN3 (TX-RX Unit) Pin No. Name Function Pin No. Name Function DC 8V output. Horn alert/call output. DC 5V output. Ground. AUX5 SMRD : Reset output. *1 Switched B+, DC 13.6V output, Maximum 1A.

  • Page 67: Specifications

    Frequency Range ........ K : 148 to 174MHz K2 : 136 to 162MHz M : 146 to 174MHz Number of Channels ......TK-762G : Maximum 8 channels TK-760G : Maximum 128 channels Number of Groups ......TK-760G : Maximum 128 groups Channel Spacing .........
  • Page 68 Mechelsesteenweg 418 B-1930 Zaventem, Belgium KENWOOD ELECTRONICS FRANCE S.A. 13, Boulevard Ney, 75018 Paris, France KENWOOD ELECTRONICS U.K. LIMITED KENWOOD House, Dwight Road, Watford, Herts., WD1 8EB United Kingdom KENWOOD ELECTRONICS EUROPE B.V. Amsterdamseweg 37, 1422 AC Uithoorn, The Netherlands KENWOOD ELECTRONICS ITALIA S.p.A.

This manual is also suitable for:

Tk-760gTk-762g

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