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VHF FM TRANSCEIVER
TK-260G/270G
SERVICE MANUAL
Knob (PTT)
(K29-5334-13)
Knob (MONI)
(K29-5333-13)
GENERAL ...................................................................... 2
SYSTEM SET-UP .......................................................... 2
OPERATING FEATURES .............................................. 3
REALIGNMENT ............................................................. 8
DISASSEMBLY FOR REPAIR ..................................... 16
CIRCUIT DESCRIPTION ............................................. 17
SEMICONDUCTOR DATA .......................................... 21
DESCRIPTION OF COMPONENTS ............................ 23
PARTS LIST ................................................................. 24
EXPLODED VIEW ....................................................... 30
Downloaded from
www.Manualslib.com
Knob (CHANNEL SELECTOR)
(K29-5341-03)
Knob (VOL)
(K29-5332-03)
TK-260G
M market models are shown.
manuals search engine
Antenna
(T90-0679-05):M
Cabinet assy
(A02-2391-23)
Knob (PTT)
(K29-5334-13)
Knob (MONI)
(K29-5333-13)
TK-270G
CONTENTS
PACKING ..................................................................... 32
ADJUSTMENT ............................................................. 33
DISPLAY UNIT (X54-3250-10) ............................... 41
TX-RX UNIT (X57-587X-XX) .................................. 43
SCHEMATIC DIAGRAM .............................................. 49
BLOCK DIAGRAM ....................................................... 57
LEVEL DIAGRAM ........................................................ 59
KNB-14/KNB-15A (Ni-Cd BATTERY) .......................... 60
OPTIONS ..................................................................... 61
SPECIFICATIONS ................................... BACK COVER
©
1999-9 PRINTED IN JAPAN
B51-8493-00(S) 1425
Knob (ENC)
(K29-5331-03)
Knob (VOL)
(K29-5332-03)
Cabinet assy
(A02-2385-23)
Key top (DTMF)
(K29-5330-02)

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   Summary of Contents for Kenwood TK-260G

  • Page 1: Table Of Contents

    VHF FM TRANSCEIVER TK-260G/270G SERVICE MANUAL © 1999-9 PRINTED IN JAPAN B51-8493-00(S) 1425 Antenna (T90-0679-05):M Knob (CHANNEL SELECTOR) Knob (ENC) (K29-5341-03) (K29-5331-03) Knob (VOL) Knob (VOL) (K29-5332-03) (K29-5332-03) Cabinet assy Cabinet assy (A02-2391-23) (A02-2385-23) Knob (PTT) Knob (PTT) (K29-5334-13) (K29-5334-13)

  • Page 2: General

    WE CANNOT guarantee oscillator stability when using applies to all parts, components, kits, or chassis. If the part channel element manufactured by other than KENWOOD or number is not known, include the chassis or kit number of which its authorized agents.

  • Page 3: Operating Features

    • 2-Tone Encode Select: To transmit using a 2-Tone • TK-260G code, press the PTT switch and the 2-Tone Encode Power switch/ Channel selector...

  • Page 4

    TK-260G/270G OPERATING FEATURES ° • , 2 2 2 2 2 ,3 3 3 3 3 keys u u u u u 2. Programmable keys These are PF (Programmable Function) keys. Press The functions the FPU programs to the function keys are each key to activate its auxiliary function.

  • Page 5

    DTMF Signallling call. Also appears when you transmit using Code Squelch Note: or Selective Call. The code for the TK-260G is not selectable. Appears while scanning. You cannot change the tone in step 2 by using the Channel Up and Channel Down keys.

  • Page 6

    TK-260G/270G OPERATING FEATURES 3) Scan Stop Condition 6 Selected with talkback The scan stops temporarily if the following conditions are The transceiver reverts to the channel before scanning or satisfied. the channel that you changed during scan. 1 The receiving signal matches the signalling code in your 8) Scan End radio that is set by the programming software (KPG-56D).

  • Page 7

    TK-260G/270G OPERATING FEATURES 4) Battery Warning 6. Option Signalling (DTMF/2 tone) This transceiver has a battery warning feature. If low voltage Built-in DTMF decoder is available for option signalling. is detected during transmission, the transceiver warns you by Built-in 2-Tone decoder is available for option signalling.

  • Page 8: Realignment

    TK-260G/270G OPERATING FEATURES / REALIGNMENT REALIGNMENT 7. Audible user feedback tones The transceiver outputs various combinations of tones to 1. Modes notify the user of the transceiver operating state. The main User mode tones are listed below The high tone is 1477Hz, the mid tone is 941Hz, and the...

  • Page 9

    4. Set the firmware to be updated by File select (=F1). The KPG-22 connects the SP/MIC connector of the TK- 260G/270G to the computers RS-232C serial port. 5. Hold down the [LAMP] and [MON] switches on the TK-260G/ 270G, and press the power switch. 5-4. Programming software description When the [LAMP] and [MON] switches are held down for The KPG-56D programming disk is supplied in 3-1/2”...

  • Page 10

    TK-260G/270G REALIGNMENT 9. If you want to continue programming other TK-260G/ Note: You can clone the programmed data between the 270Gs, repeat steps 5 to 8. tramsceiver listed below. Frequency version must be same. Notes: To start the Firmware Programmer from KPG-56D, the...

  • Page 11

    TK-260G/270G REALIGNMENT 8. Self Programming Mode (TK-270G only) Write mode for frequency data and signalling etc. Mainly X57-587X used by the person maintaining the user equipment. Compoent Side 8.1 Self programming mode setting Remove D17 from the TX-RX unit (Figure 3) (K models only).

  • Page 12

    Low Power PWR_L___ Data clear 10 Wide/Narrow Wide WIDE____ [LAMP] Narrow NARROW__ [2]/[3] 11 Scan DELETE SCAN_DEL Not used for TK-260G [MON] Busy channel lockout Delete/ADD ADD SCAN_ADD Default 12 Priority P.CH_NO__ Not used when (Scan) Priority is not Fixed. [2]/[3] Channel P.CH_YES_...

  • Page 13

    Pressing the [LAMP] when "SELF" is displayed, sets the RF Power Low MON_21 Function Setting Mode. Scan MON_22 * TK-260G cannot be selected. Select an item set using [3] then change the selection with the encoder. Scan DEL/ADD MON_23 * TK-260G cannot be selected.

  • Page 14

    TK-260G/270G REALIGNMENT No. Function Choices Display Remarks No. Function Choices Display Remarks • Optional Feature ]TK-270G Group Up KEY2_25 8 Power On Tone YES/NO PONT_YES Default:YES only Scrambler KEY2_26 Only when scrambler is set 9 Control Tone YES/NO CNTT_YES Default:YES...

  • Page 15

    35 DTMF Code SQ DTMF_OFF Default not reset. Signaling SEL CALL DTMF_SEL The TK-260G cannot reset the memory. 36 Inter Mediaate 0-9,A-D,*,# IMC__#_ Default: # (Can be set only when Flow Chart Code DTMF signaling = SEL CALL.) 37 Group Code 0-9,A-D,*,# GPCD_FF_ Default;OFF...

  • Page 16: Disassembly For Repair

    Separating the case assembly from the chassis. Separating the chassis from the unit. 1. Remove the two knobs and three round units • TK-260G 2. Remove the two screws 1. Remove the twelve small screws , and the three large 3.

  • Page 17: Circuit Description

    TK-260G/270G CIRCUIT DESCRIPTION 1. Frequency configuration 3) IF Amplifier circuit The first IF signal is passed through a four-pole monolithic The receiver utilizes double conversion. The first IF is 49.95 crystal filter (XF1) 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 form the PLL circuit.

  • Page 18

    TK-260G/270G CIRCUIT DESCRIPTION 5) Audio amplifier circuit (3) DTMF (High-speed data) The demodulated signal from IC4 is amplified by IC16 (2/ The DTMF input signal from the IF IC(IC4) is amplified by 2), high-pass filtered, low-pass filtered, high-pass filtered, IC16(2/2) and goes to IC18, the DTMF decoder. The decoded band-eliminate filtered, and de-emphasized by IC14.

  • Page 19: Power Supply

    TK-260G/270G CIRCUIT DESCRIPTION 3) UNLOCK DETECTOR If a pulse signal appears at the LD pin of IC2, an unlock From DRIVE condition occurs, and the DC voltage obtained form D1, T/R SW POWER AMP (D5) R1, and C6 causes the voltage applied to the microprocessor to go low.

  • Page 20

    TK-260G/270G CIRCUIT DESCRIPTION 3) Low battery warning 6. Control Circuit The battery voltage is monitored by the microprocessor The control circuit consists of a microprocessor (IC13) and (IC13). 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 LED flashes red to data to and from the display unit.

  • Page 21: Semiconductor Data

    TK-260G/270G CIRCUIT DESCRIPTION/SEMICONDUCTOR DATA Pin No. Name I/O Active Function 8. CONTROL SYSTEM Keys and channel selector circuit. Oscillation terminal The signal from the keys and channel selector are directly Chip enable. Serial data transfer terminal. input to the microprocessor, as shown in fig. 10.

  • Page 22

    *E Trunk: TX Request input SFTSTB Shift register strobe output Encoder pulse input 1 Shift register 1:BU4094BCFV(IC5) DACS Chip select output(Max dev) Select:L CH selector input (TK-260G) Pin function Port Function AUX4 Option board port 4 *Smar Trunk: Wide/Narrow SW...

  • Page 23: Description Of Components

    TK-260G/270G DESCRIPTION OF COMPONENTS DISPLAY UNIT (X54-3250-10) (TK-270G Only) Ref. No. Use/Function Operation/Condition Ref. No. Use/Function Operation/Condition IC501 LCD driver Transistor DC switch / W/N audio amplitude adjust Q501 Transistor Current driver / LCD back light LED AVR Transistor DC switch...

  • Page 24: Parts List

    CHIP R J 1/16W K29-5330-02 KEY TOP(DTMF) 270G K29-5331-03 KNOB(ENCODER) 270G D501-504 MA2S111 DIODE 1B,1D K29-5332-03 KNOB(VOLUME) D505 1SS373 DIODE 260G : TK-260G (K),(M) M : TK-260G(M),TK-270G(M) 270G : TK-270G (K),(M) K : TK-260G(K),TK-270G(K) Downloaded from www.Manualslib.com manuals search engine...

  • Page 25

    CHIP C 1.5PF CC73GCH1H050B CHIP C 5.0PF Q501 2SB1132(Q,R) TRANSISTOR Q502 2SC4617(S) TRANSISTOR C92-0560-05 CHIP-TAN 10UF 6.3WV TX-RX UNIT (X57-5870-XX) -10:TK-260G K,M C92-0560-05 CHIP-TAN 10UF 6.3WV -11:TK-270G K -21:TK-270G M C95 ,96 CK73GB1H102K CHIP C 1000PF C92-0560-05 CHIP-TAN 10UF 6.3WV B30-2019-05...

  • Page 26

    SMALL FIXED INDUCTOR(1UH) C245 CK73GB1H471K CHIP C 470PF L40-1092-81 SMALL FIXED INDUCTOR L40-3391-86 SMALL FIXED INDUCTOR(3.3UH) C246 CK73FB1A105K CHIP C 1.0UF 260G : TK-260G (K),(M) M : TK-260G(M),TK-270G(M) 270G : TK-270G (K),(M) K : TK-260G(K),TK-270G(K) Downloaded from www.Manualslib.com manuals search engine...

  • Page 27

    J 1/16W RK73GB1J122J CHIP R 1.2K J 1/16W R90 ,91 RK73GB1J332J CHIP R 3.3K J 1/16W RK73GB1J221J CHIP R J 1/16W 260G : TK-260G (K),(M) M : TK-260G(M),TK-270G(M) 270G : TK-270G (K),(M) K : TK-260G(K),TK-270G(K) Downloaded from www.Manualslib.com manuals search engine...

  • Page 28

    J 1/16W R230 RK73GB1J223J CHIP R J 1/16W R156 RN73GH1J683D CHIP R D 1/16W R231 RK73GB1J104J CHIP R 100K J 1/16W 260G : TK-260G (K),(M) M : TK-260G(M),TK-270G(M) 270G : TK-270G (K),(M) K : TK-260G(K),TK-270G(K) Downloaded from www.Manualslib.com manuals search engine...

  • Page 29

    2SK1215(E) MA2S111 DIODE 260G 1SS373 DIODE 1SR154-400 DIODE RB706F-40 DIODE D302,303 HVC350B VARIABLE CAPACITANCE DIODE D305 HVC350B VARIABLE CAPACITANCE DIODE 260G : TK-260G (K),(M) M : TK-260G(M),TK-270G(M) 270G : TK-270G (K),(M) K : TK-260G(K),TK-270G(K) Downloaded from www.Manualslib.com manuals search engine...

  • Page 30: Exploded View

    TK-260G/270G EXPLODED VIEW (TK-260G) 50 37 TX-RX unit (A/2) A M2.6x4 :N09-2319-05 TX-RX unit (B/2) B M2x3.5 :N09-2331-05 C NUT :N14-0582-14 D NUT :N14-0583-04 E NUT :N14-0588-04 F M2.6x6 :N30-2606-46 G M3x4 :N30-3004-46 J φ 2x4.5 :N78-2045-46 K φ 2x3 :N79-2030-46 L φ...

  • Page 31

    TK-260G/270G EXPLODED VIEW (TK-270G) 50 37 DISPLAY unit J32-0925-04 TX-RX unit (A/2) TX-RX unit (B/2) A M2.6x4 :N09-2319-05 B M2x3.5 :N09-2331-05 C NUT :N14-0582-14 D NUT :N14-0583-04 F M2.6x6 :N30-2606-46 H M2x3 :N39-2030-46 I M2x5 :N67-2005-46 J φ 2x4.5 :N78-2045-46 K φ...

  • Page 32: Packing

    TK-260G/270G PACKING 32.PACKING FIXTURE (H12-1487-02) 33.PROTECTION BAG (H25-0085-04) 7. WARRANTY CARD (B46-0470-00) : K 45.BELT HOOK (J29-0624-03) ANT. HELICAL ANTENNA 34.PROTECTION BAG (T90-0679-05) : M (H25-2012-04) 8. INSTRUCTION MANUAL (B62-1113-00) : 270G 4. CAP (SP/MIC) 9. INSTRUCTION MANUAL (B09-0351-03) (B62-1129-00) : 260G 41.SP/MIC HOLDER...

  • Page 33: Adjustment

    TK-260G/270G ADJUSTMENT Test Equipment Required for Alignment Test Equipment Major Specifications Standard Signal Generator Frequency Range 150 to 175MHz (SSG) Modulation Frequency modulation and external modulation. Output -127dBm/0.1µV to greater than -47dBm/1mV Power Meter Input Impedance 50Ω. Operation Frequency 150 to 175MHz or more.

  • Page 34

    TK-260G/270G ADJUSTMENT Repair Jig (Extention Flat cable : part No. Frequency and signalling The set has been adjusted for the frequencies shown in the E37-0851-05) following table. When required. re-adjust them following the This cable is used for connecting the TK-270G display unit adjustment procedure to obtain the frequencies you want in and TX/RX unit when you test or repair the transceiver.

  • Page 35

    TK-260G/270G ADJUSTMENT ° Press [ ], to enter tuning mode. Use the [2 ] key to write Panel Tuning Mode tuning data through the tuning modes, and the channel selector 150-174(MHz) knob to adjust the tuning requirements (1 to 256 appears on...

  • Page 36

    TK-260G/270G ADJUSTMENT Since the TK-260G cannot be tuned from the panel, the FPU (KPG-56D) should be used for adjustment. Adjust the receive BPF waveform according to the appropriate adjustment item. Common Section Measurement Adjustment Specifications/ Item Condition Remark Test equipment...

  • Page 37

    TK-260G/270G ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method ±50Hz 7. Max DEV 1) Adj item [MAX] Power meter Encoder 4.2kHz Adjust Adjust [∗∗∗] Dev meter SP/MIC connector knob (According to [Wide] AG:1kHz / 150mV Oscilloscope...

  • Page 38

    TK-260G/270G ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method 14.DQT 1) Adj item [FDQT] Power meter Encoder Wide:0.75kHz MAX Devition Adjust [∗∗∗] Dev meter SP/MIC connector knob Narrow:0.4kHz MAX Adjust LPF:3kHz Oscilloscope HPF:OFF [Wide] 2) Adj item D Q T] Adjust [∗∗∗]...

  • Page 39

    TK-260G/270G ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method 1. Sensitivity Adj item [SENS] Encoder knob : ([S E N S]) : [88] Adjustment Adjust [∗∗∗] : (S S) : [134] E N S] : (S...

  • Page 40

    TK-260G/270G ADJUSTMENT Adjustment points TX-RX unit (X57-587) Component side view Foil Side View L307 Battery terminal L305 L306 IC12 IC14 VR1 : Frequency adjustment TC1 : Transmit lock voltage adjustment TC2 : Receive lock voltage adjustment L305: L306: Band-pass filter waveform adjustment...

  • Page 41: Pc Board Views

    TK-260G/270G PC BOARD VIEW DISPLAY UNIT (X54-3250-10) Foil Side View DISPLAY UNIT (X54-3250-10) Component Side View DISPLAY UNIT (X54-3250-10) DISPLAY UNIT (X54-3250-10) Component Side View Foil Side View R518 R513 IC501 C515 Q502 R522 R517 Q501 CP501 L501 D502 C506...

  • Page 42: Tx-rx Unit (x57-587x-xx)

    TK-260G/270G PC BOARD VIEW TX RX UNIT (X57-5870-XX) Component Side View 0-10:TK260G K,M, 0-11:TK-270G K, 0-21:TK-270G M TX-RX UNIT (X57-5870-XX) R218 Component Side View C194 R165 R118 C184 R259 C209 R164 R123 R122 C202 C261 C207 R170 C216 R147 C223...

  • Page 43

    TK-260G/270G PC BOARD VIEW TX RX UNIT (X57-5870-XX) Foil Side View 0-10:TK260G K,M, 0-11:TK-270G K, 0-21:TK-270G M TX-RX UNIT (X57-5870-XX) R108 Foil Side View C241 C146 MIC1 R258 C126 C131 C108 C139 C107 C115 C124 C324 C130 R314 C320 C137...

  • Page 44

    TK-260G/270G TX-RX UNIT (X57-5870-XX) PC BOARD VIEW Component Side + Foil Side View TX RX UNIT (X57-5870-XX) Component Side + Foil Side View 0-10:TK260G K,M, 0-11:TK-270G K, 0-21:TK-270G M R218 C241 R108 C194 C146 R165 R118 C184 R259 MIC1 C209...

  • Page 45: Schematic Diagram

    TK-260G SCHEMATIC DIAGRAM • Note) Component marked with a dot ( ) are Parts of pattern 1. Downloaded from www.Manualslib.com manuals search engine...

  • Page 46: Downloaded From Www.manualslib.com Manuals Search Engine

    TK-270G SCHEMATIC DIAGRAM Note) Component marked with a dot ( • ) are Parts of pattern 1. Downloaded from www.Manualslib.com manuals search engine...

  • Page 47: Block Diagram

    TK-260G/270G TK-260G/270G BLOCK DIAGRAM Downloaded from www.Manualslib.com manuals search engine...

  • Page 48: Level Diagram

    TK-260G/270G TK-260G/270G LEVEL DIAGRAM KNB-14/KNB-15A (Ni-Cd BATTERY) KNB-14 CIRCUIT DIAGRAM SPECIFICATIONS Voltage : 7.2V (1.2V x 6) Charging current : 600mAh Dimensions : 60.8W x 110.8H x 17.3D (mm) Discharge pin side (projections included) Charger and charging time: KSC-15 (normal charger), approximately 8 hours...

  • Page 49

    TK-260G/270G OPTIONS KMC-17 (Speaker microphone) KMC-17 Parts List Ref. No. Parts No. Description parts marks A02-0907-08 Case (Front) A02-0908-08 Case (Rear) B09-0316-08 D10-0606-08 Lever (PTT) E11-0421-05 Phone jack E30-3138-08 Curl cord F07-0889-08 Silicon rubber (PTT) G53-0569-08 Packing (MIC case) J29-0440-08...

  • Page 50

    TK-260G/270G SPECIFICATION General Frequency Range ............150~174MHz Number of channels ............Max. 8 (TK-260G) Max. 128 (TK-270G) Number of groups ............Max. 128 (TK-270G) Channel Spacing .............. 25kHz, 30kHz (Wide) 12.5kHz, 15kHz (Narrow) PLL Step ................2.5kHz, 5kHz, 6.25kHz, 7.5kHz Operating Voltage ............

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