Kenwood TK-2168 Service Manual
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Kenwood TK-2168 Service Manual

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VHF FM TRANSCEIVER
TK-2168
SERVICE MANUAL
Knob (PTT)
(K29-9279-03)
Does not come with antenna.
Antenna is available as an option.
Antenna
(KRA-26: Option)
Knob (CH-SELECTOR)
(K29-9280-13)
(K29-9278-13)
Cabinet assy
(A02-3835-33)
©
2003-8 PRINTED IN JAPAN
B51-8654-00 (S) 157
CONTENTS
GENERAL ............................................................. 2
SYSTEM SET-UP ................................................. 2
OPERATING FEATURES ..................................... 3
REALIGNMENT .................................................... 4
DISASSEMBLY FOR REPAIR .............................. 5
CIRCUIT DESCRIPTION ....................................... 7
INSTALLATION .................................................. 11
TERMINAL FUNCTION ...................................... 12
SEMICONDUCTOR DATA ................................. 13
COMPONENTS DESCRIPTION ......................... 14
PARTS LIST ........................................................ 15
EXPLODED VIEW ............................................... 23
PACKING ............................................................ 24
ADJUSTMENT ................................................... 25
PC BOARD
TX-RX UNIT (X57-6720-31) .......................... 30
SCHEMATIC DIAGRAM ..................................... 34
BLOCK DIAGRAM .............................................. 38
LEVEL DIAGRAM ............................................... 40
KSC-30 ................................................................ 41
SPECIFICATIONS ............................ BACK COVER

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  • Page 1: Table Of Contents

    VHF FM TRANSCEIVER TK-2168 SERVICE MANUAL © 2003-8 PRINTED IN JAPAN B51-8654-00 (S) 157 CONTENTS GENERAL ............. 2 SYSTEM SET-UP ..........2 OPERATING FEATURES ........3 REALIGNMENT ............ 4 DISASSEMBLY FOR REPAIR ......5 Antenna CIRCUIT DESCRIPTION ........7 (KRA-26: Option) INSTALLATION ..........

  • Page 2: General

    Frequency range (MHz) RF power Type Choose the type of transceiver TX/RX 136~174 5.0W TK-2168 (A) Transceiver programming A personal computer (IBM PC or compatible), programming interface (KPG-22), and programming software (KPG-82D) are required for programming. (The frequency, TX power HI/LOW, and signalling data are programmed for the transceiver.)

  • Page 3: Operating Features

    TK-2168 OPERATING FEATURES GETTING ACQUAINTED 1. Operation Features Installing the (Optional) Antenna Antenna Screw the antenna into the connector on the top of the transceiver by holding the antenna at its base and turning it clockwise until secure. Installing the Belt Clip Note: When first installing the belt clip, you must remove the battery pack from the rear of the transceiver.

  • Page 4: Realignment

    Function machine. User mode For normal use. The data can be input to or read from TK-2168 and edited PC mode Used for communication between the on the screen. The programmed or edited data can be printed radio and PC (IBM compatible).

  • Page 5: Disassembly For Repair

    TK-2168 DISASSEMBLY FOR REPAIR 3. How to remove the battery terminal block. 1. Separating the case assembly from the chassis. Ω 1. Remove the volume knob 1. Remove the two screws , then pull out the back cover ≈ 2. Remove the two screws 2.
  • Page 6 TK-2168 DISASSEMBLY FOR REPAIR • Installation of chassis and cabinet assy Assembling • Installation of battery terminal block and Do not press this area, top packing packing easily deform. Install them so that no distortion or deformation occurs. • Installation of speakers and cushion, and wire styling of speakers First, mount the set to the cabinet assy.

  • Page 7: Circuit Description

    TK-2168 CIRCUIT DESCRIPTION 3) IF Amplifier Circuit 1. Frequency Configuration The first IF signal is passed through a four-pole monolithic The receiver utilizes double conversion. The first IF is 49.95 crystal filter (XF401) to remove the adjacent channel signal. MHz and the second IF is 450 kHz. The first local oscillator The filtered first IF signal is amplified by the first IF amplifier signal is supplied from the PLL circuit.
  • Page 8 TK-2168 CIRCUIT DESCRIPTION 6) Tone Volume Fixed Circuit RECEIVE SIGNALING RECEIVE SIGNALING IC601 This function generates a TONE signal sound even if the FM IF IC401 IC602 IF Amp IF Amp AF volume of the transceiver is the minimum. SIGNAL...
  • Page 9 TK-2168 CIRCUIT DESCRIPTION IC601 D3, 5, 7, 8 TX VCO DOUBLER AQUA BUFF AMP RF AMP IC606 BUFFER D4, 6, 9, 10 RX VCO Q8, 12 T/R SW IC805 DTMF/2 TONE LSDVCO LSDTCXO TCXO PLL IC IC1 5kHz/6.25kHz Fig. 8 Microphone amplifier...
  • Page 10 TK-2168 CIRCUIT DESCRIPTION 4) Encode Signalling 2) Memory Circuit (1) QT/DQT Memory circuit consists of the CPU (IC805) and an EEPROM QT,DQT data of the LSDTCXO Line is output from pin 22 of (IC804). An EEPROM has a capacity of 64k bits that contains the CPU.

  • Page 11: Installation

    TK-2168 CIRCUIT DESCRIPTION / INSTALLATION 4) Battery Type Detection INSTALLATION The transceiver automatically detects the battery type, measuring the resistance between the S-terminal and + 1. Optional Board terminal on the battery pack and changes the supplied Remove the TX/RX unit from the radio before installing the voltage to the S-tarminal as below.

  • Page 12: Terminal Function

    TK-2168 TERMINAL FUNCTION CN801 Designation Function Condition Value Switched B Output Voltage/7mA load DC (Battery terminal) ±0.5V AUX3 Load >100kΩ (Low) Vss ~ 0.4V (High) Vdd-0.8V ~ Vdd TXAFI Transmit AF input Input sensitivity/Impedance (1kHz std. dev.) 280±50mVrms @22kΩ Load AUX2 Load >100kΩ...

  • Page 13: Semiconductor Data

    TK-2168 SEMICONDUCTOR DATA Microprocessor : M30622MCA7G7GP (TX-RX UNIT : IC805) Pin function Port Port Function Function Name Name PCTV APC/BPF control data output. BSHIFT Beet shift switch. DTMF DTMF,2TONE. W/N switch Wide:H EEPDAT EEPROM data input/output. APCSW APC switch output.

  • Page 14: Components Description

    TK-2168 COMPONENTS DESCRIPTION TX-RX UNIT (X57-672X-XX) Ref. No. Use/Function Operation/Condition Ref. No. Use/Function Operation/Condition PLL system Q805(2/2) Transistor LED switch / Red IC201 Comparator (APC) Q806 Transistor AVR / PLLB IC401 FM IF system Q807 Transistor PLLB switch IC601 Audio processor...

  • Page 15: Parts List

    TK-2168 PARTS LIST CAPACITORS CC 45 TH 1H Capacitor value Color* CC45 010 = 1pF 0 = 22pF 100 = 10pF 1 = Type ... ceramic, electrolytic, etc. 4 = Voltage rating Multiplier 2 = Shape ... round, square, ect.

  • Page 16: Knob(Volume)

    E: Europe 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-2168 (Y50-578X-XX) TX-RX UNIT (X57-672X-XX) Ref. No. Address Parts No. Description Destination Ref.
  • Page 17 TK-2168 PARTS LIST TX-RX UNIT (X57-672X-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts CK73GB1E103K CHIP C 0.010UF K C344 CC73GCH1H820J CHIP C 82PF CC73GCH1H220J CHIP C 22PF C349 CC73GCH1H030B CHIP C 3.0PF...
  • Page 18 TK-2168 PARTS LIST TX-RX UNIT (X57-672X-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts C468 CC73GCH1H010B CHIP C 1.0PF C667 CK73GB1H102K CHIP C 1000PF K C469 CK73GB1H102K CHIP C 1000PF K C668...
  • Page 19 TK-2168 PARTS LIST TX-RX UNIT (X57-672X-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts CN801 E40-5932-05 PIN ASSY SOCKET L801 L92-0149-05 FERRITE CHIP J601 E11-0457-05 PHONE JACK L802 L92-0140-05 FERRITE CHIP L803-807...
  • Page 20 TK-2168 PARTS LIST TX-RX UNIT (X57-672X-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts RK73HB1J222J CHIP R 2.2K J 1/16W R457 RK73HB1J104J CHIP R 100K J 1/16W RK73HB1J470J CHIP R J 1/16W...
  • Page 21 TK-2168 PARTS LIST TX-RX UNIT (X57-672X-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts R676 RK73GB1J151J CHIP R J 1/16W MIC60 T91-0543-05 MIC ELEMENT R677-679 R92-1252-05 CHIP R 0OHM J 1/16W R681...
  • Page 22 TK-2168 PARTS LIST TX-RX UNIT (X57-672X-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts Q607 DTC144EE DIGITAL TRANSISTOR Q608 2SK1588 Q801 UMG3N TRANSISTOR Q802 UPA672T Q803 FP210 TRANSISTOR Q804 UMG3N TRANSISTOR Q805...

  • Page 23: Exploded View

    TK-2168 EXPLODED VIEW TX-RX Unit (A/2) TX-RX Unit (B/2) :N14-0583-04 :N14-0805-04 :N30-2604-46 :N30-2612-46 :N30-3006-45 :N35-3004-45 :N78-2040-46 :N83-2005-46 Parts with the exploded numbers larger than 700 are not supplied.

  • Page 24: Packing

    TK-2168 PACKING 30.ITEM CARTON CASE (H52-2014-02) 6. INSTRUCTION MANUAL (B62-1786-00) 33.HOOK (J29-0701-05) F. BINDING HEAD MACHINE SCREW (N35-3004-45) 32.HARDWARE FIXTURE ACCESSORY (J21-8464-04) 5. CAP (B09-0676-03) 28.PACKING FIXTURE (H12-3150-02) Parts with the exploded numbers larger than 700 are not supplied.

  • Page 25: Adjustment

    TK-2168 ADJUSTMENT Test Equipment Required for Alignment Test Equipment Major Specifications Standard Signal Generator Frequency Range 136 to 174MHz. (SSG) Modulation Frequency modulation and external modulation. Output -127dBm/0.1µV to greater than -47dBm/1mV Power Meter Input Impedance 50Ω. Operation Frequency 136 to 174MHz.
  • Page 26 TK-2168 ADJUSTMENT Adjustment points TX-RX unit (X57-672) Frequency and signalling Component side view 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 PTTO SP–...
  • Page 27 TK-2168 ADJUSTMENT Common Section Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method 1.Setting 1) BATT terminal votage:7.5V 2) SSG standard modulation [Wide] MOD:1kHz,DEV:3kHz [Narrow] MOD:1kHz,DEV:1.5kHz 2.VCO lock 1) CH:High Power meter 3.8V ±0.2V voltage 2) CH:Low Check 0.6V or more...
  • Page 28 TK-2168 ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method 6.VOX 10 TEST CH:Center Power meter Programming Writing AG:1KHz/4.0mV Dev meter SP/MIC connector Software:KPG-82D 7.DQT TCXO TEST CH:Center Oscilloscope Programming Write 230 hex Balance (Wide/Narrow) Software:KPG-82D (Wide/Narrow)
  • Page 29 TK-2168 ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method 15.BATT 1) BATT terminal voltage:5.5V Power meter Check Blinking of LED Detection PTT:ON BATT terminal Check 2) BATT terminal voltage:7.5V No blinking of PTT:ON Receiver Section Measurement...

  • Page 30: Tx-Rx Unit (X57-6720-31)

    TK-2168 PC BOARD TX-RX UNIT TX-RX UNIT (X57-6720-31) Component side view (J72-0895-09) (X57-6720-31) Ref. NO. Address IC201 J72-0895-09 A/2 IC601 IC602 PTTO IC604 R678 IC605 PTT/ R681 R692 IC606 PTTI IC802 Q804 (RXD) C815 R818 IC803 C690 R688 C820 R859 IC804 SP–...
  • Page 31 TK-2168 PC BOARD TX-RX UNIT (X57-6720-31) Component side view (J72-0895-09) Q602 C612 R611 C680 + R667 R676 R633 C611 R612 C607 R607 C677 R626 C625 C679 C631 IC605 C671 C614 C635 R665 C632 R640 C686 R617 R677 C689 SP MUTE...
  • Page 32 TK-2168 PC BOARD TX-RX UNIT (X57-6720-31) Foil side view (J72-0895-09) ALT2 C419 C801 Q401 Q808 XF401 R804 C615 CF401 D801 C424 L802 R646 C421 R413 R418 C413 C411 C409 C422 C430 L401 L404 Q402 C420 L416 C446 IC401 R412 R469...
  • Page 33 TK-2168 PC BOARD TX-RX UNIT (X57-6720-31) Foil side view (J72-0895-09) J72-0895-09 A/2 PTT/ J601 VR801 EXT. MIC/SP POWER/AF VOL Q404 C448 C466 C475 R427 R431 R440 R461 R425 C447 C467 R438 C472 R460 C444 C464 C486 R441 L409 C474 C469...

  • Page 34: Schematic Diagram

    TK-2168 SCHEMATIC DIAGRAM TX-RX UNIT (X57-6720-31) PLLB PLLB 1k*2 1k*2 UMG9N UMG9N Q1-3 LEVEL SHIFT DTC144EE PLL SYSTEM R:3.63V PLLCLK PLLCLK PLLDATA PLLDATA 7.5V L801 F801 BATT SAVE SAVE VOLOUT BATT LOCAL AF AMP R443 220k IC606 TC75S51FE R436 REVERSE...
  • Page 35 TK-2168 SCHEMATIC DIAGRAM TX-RX UNIT (X57-6720-31) PLLB T:3.58V R:3.58V VCO/TX SHIFT SWITCH D3,5,7,8 1SV325 4.7k 2SK508NV(K52) TX VCO 2SC5108(Y) T:4.14V RF BUFFER AMP R:0V 9p (B) HSC277 PLL IC 1SV325 F_IN AMP 2SC5108(Y) 4p (B) T:1.76V T:1.35V 0.5p R:1.86V R:1.33V...
  • Page 36 TK-2168 SCHEMATIC DIAGRAM TX-RX UNIT (X57-6720-31) TX FINAL AMP D201,401 PRE-DRIVE AMP TX/RX RF SWITCH Q211 Q206 2SK2595 RF AMP D201 2SK3077 TX DRIVE AMP C280 L218 R262 T:1.3V HSC277 C202 R203 C203 R:0.9V Q207 2SC5108(Y) 1000p 2SK2596 1000p T:1.27V...
  • Page 37 TK-2168 SCHEMATIC DIAGRAM TX-RX UNIT (X57-6720-31) Note : The components marked with a dot ( ) D204,206 D204 HVC131 ANT SWITCH are parts of layer1. C355 L221 L222 L223 C344 D206 L226 L227 L229 CN13 1000p HVC131 C358 C360 C363 T:1.6V...

  • Page 38: Block Diagram

    TK-2168 BLOCK DIAGRAM X57-672 (A/2) D2,D11,D14 HSC277 TX:272.00~348.00MHz Q2,Q3 MB15E03SL RX:371.90~447.90MHz UMG9N PLLDATA PLLDATA LEVEL PLLCLK PLLCLK CONV IC803 IC802 XC61CN5002NR Q6 2SK508NV(K52) PST9134NR PLLB D3,D5,D7.D8 1SV323 Q1 DTC144EE D12 1SV272 RESET RESET LEVEL CONV IC801 D801 XC6204B502MR RB521S-30 Q8 2SJ347...
  • Page 39 TK-2168 BLOCK DIAGRAM 2SC5108(Y) TX/RX:136.00~174.00MHz PLLB Q206 Q207 Q211 D201,D401 D204,D206,D208,D212 2SK3077 2SK2596 2SK2595 2SC5108(Y) 2SC5108(Y) HSC277 HVC131 BUFF 5R5T Q208 DTC114EE Q213 IC201 Q209 2SK879(Y) DTA144EE TA75W01FU CURRENT Q212 2SK1824 APCSW APCSW Q10 2SC4617(S) D13 MA2S111 Q210 DTC114EE RIPPLE...

  • Page 40: Level Diagram

    TK-2168 LEVEL DIAGRAM...

  • Page 41: Ksc-30

    TK-2168 KSC-30 Operating flow chart POWER ON INITIALIZATION INSERT BATTERY Does S terminal Ref. No. Address Parts No. Description Destination parts connect? KSC-30 A02-3656-08 CABINET BOTTOM Vs : Low Vs : High ∗ A02-3841-08 CABINET UPPER Battery is not (Ni-Cd or Ni-MH)

  • Page 42: Specifications

    13, Boulevard Ney, 75018 Paris, France Sales Marketing Division KENWOOD ELECTRONICS U.K. LIMITED 1 Ang Mo Kio Street 63, Singapore 569110 KENWOOD House, Dwight Road, Watford, Herts., WD18 9EB, United Kingdom KENWOOD ELECTRONICS EUROPE B.V. Amsterdamseweg 37, 1422 AC Uithoorn, The Netherlands...

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