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Kenwood TK-868HG Service Manual

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UHF FM TRANSCEIVER / UHF
TK-868HG
SERVICE MANUAL /
128 channels / 128
REVISED /
CONTENTS
INSTALLATION ........................................................ 2
PARTS LIST .............................................................. 7
EXPLODED VIEW .................................................. 15
PACKING ................................................................ 16
ADJUSTMENT ....................................................... 17
LEVEL DIAGRAM ................................................... 33
PC BOARD VIEWS
DISPLAY UNIT (X54-3270-10) .......................... 35
PLL/VCO (X58-4670-XX) .................................. 36
TX-RX UNIT (X57-596X-XX) (A/2) ................... 37
TX-RX UNIT (X57-596X-XX) (B/2) ................... 43
SCHEMATIC DIAGRAM ........................................ 47
BLOCK DIAGRAM .................................................. 51
SPECIFICATIONS ................................................... 54
Panel assy
(A62-0642-03)
© 2000-12
B51-8541-10 ( N ) 610
The service manual is the same as the C market, TK-
868HG (B51-8541-00) service manual with the exception
of the new C3 market.
Key top
(K29-5343-02)

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Summary of Contents for Kenwood TK-868HG

  • Page 1: Table Of Contents

    UHF FM TRANSCEIVER / UHF TK-868HG SERVICE MANUAL / 128 channels / 128 © 2000-12 B51-8541-10 ( N ) 610 The service manual is the same as the C market, TK- REVISED / 868HG (B51-8541-00) service manual with the exception of the new C3 market.

  • Page 2: Installation

    C,C3 J72-0678-02 2. Set jumper resistors (0Ω) R134 and R135 of the TX-RX unit TK-868G B51-8502-00 M,M3 J72-0678-02 (A/2) as shown in Table 1. TK-868HG B51-8541-00 SUPPLEMENT J72-0760-02 TK-868HG B51-8541-10 REVISED C,C3 J72-0760-12 This Service manual Frequency range : 450~490MHz...
  • Page 3 TK-868HG INSTALLATION / PA/HA Unit (KAP-1 : Option) Modifying the Transceiver Installing the KAP-1 in the Transceiver Horn alert The Horn Alert (max. 2A drive) and Public Address func- The signal from pin 4 of IC9 on the TX-RX unit turns Q5 tions are enabled by inserting the KAP-1 W1 (3P;...
  • Page 4 TK-868HG INSTALLATION / Public address The signal from pin 13 of IC9 on the TX-RX unit drives PA relay in the KAP-1 and switches the audio power amplifier output between the external PA system (through KCT-19) and internal and external speakers.
  • Page 5 TK-868HG INSTALLATION / Emergency Mode Transceiver Modification Procedure install the foot switch Install the foot switch through the KCT-19 and KCT-18. When the switch is treaded on, the radio enters the emer- gency mode. Change the power switch circuit TX-RX unit (B/2) : Control section $R705 : Attach (R92-1252-05, 0Ω)
  • Page 6 TK-868HG INSTALLATION / Emergency Mode System Chart Press the Foot switch once Emergency mode Emergency channel LCD dots light TX 25 sec. ← → RX 5 sec. Dots Foot switch 1 push Emergency ACK code receive LCD dots light After 1 min.

  • Page 7: Parts List

    TK-868HG PARTS LIST / New Parts. indicates safety critical components. L : Scandinavia K : USA P : Canada Parts without Parts No. are not supplied. Y : PX (Far East, Hawaii) T : England E : Europe Les articles non mentionnes dans le Parts No. ne sont pas fournis.
  • Page 8 TK-868HG PARTS LIST / TX-RX UNIT (X57-596X-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation CK73GB1E223K CHIP C 0.022UF C139,140 CK73GB1H471K CHIP C 470PF C92-0507-05 CHIP-TAN 4.7UF 6.3WV C141 C92-0719-05...
  • Page 9 TK-868HG PARTS LIST / TX-RX UNIT (X57-596X-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation C212 CK73GB1H471K CHIP C 470PF C530 CK73GB1H152K CHIP C 1500PF C214 C93-0553-05 CHIP C 3.0PF...
  • Page 10 TK-868HG PARTS LIST / TX-RX UNIT (X57-596X-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation C620 CK73GB1H471K CHIP C 470PF L33 ,34 L92-0179-05 FERRITE CHIP C621 CK73GB1H102K CHIP C 1000PF...
  • Page 11 TK-868HG PARTS LIST / TX-RX UNIT (X57-596X-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation RK73GB1J100J CHIP R 1/16W R124 RK73GB1J103J CHIP R 1/16W RK73GB1J471J CHIP R 1/16W R125 RK73GB1J333J...
  • Page 12 TK-868HG PARTS LIST / TX-RX UNIT (X57-596X-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation R190 RK73GB1J473J CHIP R 1/16W R561 RK73GB1J333J CHIP R 1/16W R192 RK73GB1J103J CHIP R 1/16W...
  • Page 13 TK-868HG PARTS LIST / TX-RX UNIT (X57-596X-XX) PLL/VCO (X58-4670-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation HSB123 DIODE IC509 BU4066BCFV IC (ANALOG SWITCH X4) 02DZ20(Y,Z) ZENER DIODE IC510 BU4094BCFV...
  • Page 14 TK-868HG 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 C110 CC73GCH1H060D CHIP C 6.0PF C111 CC73GCH1H050B CHIP C 5.0PF C112 CC73GCH1H1R5B CHIP C 1.5PF C113...

  • Page 15: Exploded View

    TK-868HG EXPLODED VIEW / Parts with the exploded numbers larger than 700 are not supplied.
  • Page 16 TK-868HG PACKING / 31 Polystyrene foamed fixture (R) (H10-6629-02) 33 Protection bag (H25-0720-04) 8 Instruction manual (B62-1259-20) 30 Polystyrene foamed fixture (F) (H10-6628-02) 34 Item carton case (H52-1654-02) Parts with the exploded numbers larger than 700 are not supplied.
  • Page 17 The set has been adjusted for the frequencies shown in the following table. When required, re-adjust them following the adjustment procedure to obtain the frequencies you want in actual operation. Frequency (MHz) Channel No. TK-868HG C TK-868HG C3 470.050 470.100 415.050 415.100 450.050...
  • Page 18 TK-868HG ADJUSTMENT / Signalling Signalling No. None None None 100Hz square QT 67.0Hz QT 67.0Hz QT 151.4Hz QT 151.4Hz QT 210.7Hz QT 210.7Hz QT 250.3Hz QT 250.3Hz DQT D023N DQT D023N DQT D754I DQT D754I DTMF DEC, (159D) DTMF ENC, (159D)
  • Page 19 TK-868HG 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]...
  • Page 20 TK-868HG ADJUSTMENT Test Equipment Required for Alignment Test Equipment Major Specifications 1. Standard Signal Generator Frequency Range 400 to 520MHz (SSG) Modulation Frequency modulation and external modulation Output –127dBm/0.1µV to greater than –7dBm/100mV 2. Power Meter Input Impedance 50Ω Operation Frequency...
  • Page 21 TK-868HG & – 1 : BLC 2 : PSB 3 : E 4 : PTT 5 : ME 6 : MIC 7 : HOOK 8 ; CM...
  • Page 22 TK-868HG ADJUSTMENT Common Section Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment ± 0.1V 1. PLL lock 1) Set test mode TX-RX CV TC106 7.5V voltage CH : CH3 - Sig1 Power meter (A/2) AUX : ON F.
  • Page 23 TK-868HG...
  • Page 24 TK-868HG ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment 2) “S.Q.L.3” Rear Front CH / Adjust to the Adjust [ *** ] panel panel squelch threshold SSG freq’ AF VTVM point. : 470.050MHz C Distortion (EXT.SP)
  • Page 25 TK-868HG...
  • Page 26 TK-868HG ADJUSTMENT Transmitter Section Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment 1. Frequency 1) Set test mode Power meter Rear Front CH / Check 470.100MHz±100Hz C Select “FREQ” in tuning mode. F. counter panel panel 415.100MHz±100Hz C3...
  • Page 27 TK-868HG...
  • Page 28 TK-868HG ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment 6. Modulation 1) Set test mode Power meter Rear Front CH / Make the de- (Wide/Narrow) balanced MIC input : OFF Deviation panel panel modulation • Wide Select “BAL”...
  • Page 29 TK-868HG...
  • Page 30 TK-868HG ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment ± 50Hz (Wide/Narrow) 2) “_.F.Q.T” Power meter Rear Front CH / 0.75kHz PTT : ON Deviation panel panel Adjust [ *** ] meter Oscilloscope 3) “_.F.Q.T._.”...
  • Page 31 TK-868HG...
  • Page 32 Chassis The tuning data (Deviation, Squelch, etc.) for the EEPROM, Use jig (Part No. : A10-4010-02) for repairing the TK-868HG. is stored in memory. When parts are changed, readjust the The jig facilitates the voltage check when the voltage on the transceiver.

  • Page 33: Tx-Rx Unit (X57-596X-Xx) (B/2)

    TK-868HG TK-868HG LEVEL DIAGRAM / Receiver Section / Center Frequency 49.95MHz 450kHz Audio Frequency SG input level for 12dB SINAD are obtained measured by connecting SG to each point via a 0.01µF capacitor. AF VTVM AF level obtained when the AF output level is adjusted for 0.45V/4Ω with the front panel AF VOL control.
  • Page 34 TK-868HG DISPLAY UNIT (X54-3270-10) DISPLAY UNIT (X54-3270-10) PLL/VCO (X58-4670-XX) -12 : C -14 : C3 Component side view Component side view Foil side view J72-0676-02 C115 C119 L109 CN101 L103 C104 L112 (ST) 6 C122 Q105 L106 Q106 R109 Q102...
  • Page 35 TK-868HG TX-RX UNIT (X57-596X-XX) (A/2) 3-05 : C 3-07 : C3 Component side view Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address IC13 IC400 Component side IC400 Pattern 1 Pattern 2 IC11 Pattern 3 IC12 Pattern 4...
  • Page 36 TK-868HG Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address TX-RX UNIT (X57-596X-XX) (A/2) 3-05 : C 3-07 : C3 Foil side view D16 11N Q18 13N D18 12Q...
  • Page 37 TK-868HG Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address TX-RX UNIT (X57-596X-XX) (A/2) 3-05 : C 3-07 : C3 IC13 Component side view + Foil side...
  • Page 38 TK-868HG TX-RX UNIT (X57-596X-XX) (B/2) 3-05 : C 3-07 : C3 Component side view D512 J72-0760-12 B/2 D511 R566 C543 C632 L501 R567 R560 C501 C542 IC510 R561 IC507 R533 C517 R517 C525 C537 R564 R505 R543 IC513 R563 C541...
  • Page 39 TK-868HG TX-RX UNIT (X57-596X-XX) (B/2) 3-05 : C 3-07 : C3 Component side view + Foil side J72-0760-12 B/2 D512 R550 D511 R548 R501 R553 R612 C534 R566 C543 C632 R567 L501 C542 R613 R560 R595 C530 C501 R558 C536...

  • Page 40: Schematic Diagram

    TK-868HG SCHEMATIC DIAGRAM / Note : Components marked with a dot (·) are parts of patterun 1.

  • Page 41: Block Diagram

    TK-868HG TK-868HG TK-868HG BLOCK DIAGRAM /...

  • Page 42: Specifications

    TK-868HG SPECIFICATIONS GENERAL Frequency Range ........ C : 450 to 490MHz C3 : 400 to 430MHz Number of Channels ......Maximum 128 channels Number of Groups ......Maximum 128 channels Channel Spacing ......... Wide : 25kHz Narrow : 12.5kHz PLL Channel Stepping ......5, 6.25kHz Operating Voltage .......
  • Page 43 TK-868HG...
  • Page 44 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.