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.
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...
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 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 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 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 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 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.
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...
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 .......