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Kenwood TK-260N Service Manual
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Kenwood TK-260N Service Manual

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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 TK-260N

  • 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: Table Of Contents

    VHF FM TRANSCEIVER TK-260G/(N)/270G/(N) SERVICE MANUAL © E VERSIONS 2000-4 PRINTED IN JAPAN B51-8532-00(S) 570 Antenna (T90-0695-15):E,(N)E (T90-0680-05):(N)T (T90-0681-05):(N)E2 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 3: General

    TK-260G/(N)/270G/(N) GENERAL / SYSTEM SET-UP INTRODUCTION PERSONNEL SAFETY SCOPE OF THIS MANUAL The following precautions are recommended for personnel This manual is intended for use by experienced technicians safety: familiar with similar types of commercial grade communications DO NOT transmit until all RF connectors are verified secure equipment.

  • Page 4: Operating Features

    TK-260G/(N)/270G/(N) OPERATING FEATURES causes an error tone to sound. (When changing a 1. Operation Features channel from high to low power, all channels programmed with high power are changed to low.) • 2-Tone Encode Select: To transmit using a 2-Tone •...
  • Page 5 TK-260G/(N)/270G/(N) 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 6 TK-260G/(N)/270G/(N) OPERATING FEATURES 10) RF power low 3. Display (TK-270G only) Used to temporarily switch transmission output to low power. Turning the function on enables: Hi→Low, Low→Low Key states are backed up, except in the PC mode when they are reset. 11) Scan (TK-270G only) Pressing this key starts scanning.
  • Page 7 TK-260G/(N)/270G/(N) 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 8 TK-260G/(N)/270G/(N) 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. a flashing red "LED".
  • Page 9 TK-260G/(N)/270G/(N) 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 Panel test mode Panel tuning mode (TK-270G only)

  • Page 10: Realignment

    TK-260G/(N)/270G/(N) REALIGNMENT Notes: 4. Checksum • The data stored in the personal computer must match the Executing this function, "TUNING" appears on the display model type when it is written into the flash memory. of TK-270G while calculating the checksum . •...

  • Page 11: Clone Mode

    TK-260G/(N)/270G/(N) REALIGNMENT 6. Check the connection between the TK-260G/270G and When programming the firmware, it is recommend to copy the personal computer, and make sure the TK-260G/270G the data from the floppy disk to your hard disk before you is in Program mode. update the radio firmware.
  • Page 12 TK-260G/(N)/270G/(N) REALIGNMENT PTT/RXD PTT/RXD PTT/RXD REMOTE/TXD REMOTE/TXD REMOTE/TXD Cloning cable Fig. 2 8. Self Programming Mode (TK-270G only) Write mode for frequency data and signalling etc. Mainly used by the person maintaining the user equipment. X57-587X Compoent Side 8.1 Self programming mode setting Remove D17 from the TX-RX unit (Figure 3) (K, E, (N)E, K2 models only).
  • Page 13 TK-260G/(N)/270G/(N) REALIGNMENT 8-2. Channel Setting Mode No. Function Choices Display Remarks This is a mode for making channel settings with the panel 7 Busy Channel NO BCL_NO__ Default keys without using the FPU. Lockout Type 1 BCL_1___ BCL_YES for K, E, (N)E, K2 type Type 2 BCL_2___ N/A for K, E, (N)E, K2 type...
  • Page 14 TK-260G/(N)/270G/(N) REALIGNMENT Flow Chart 8-3. Function Setting Mode Channel Setting Mode This is a mode for using the panel keys to make function settings without using the FPU, that operate on all channels. Self programming mode [Side2] Pressing the [Side1] when "SELF" is displayed, sets the [Side2] Channel set mode Channel selection...
  • Page 15 TK-260G/(N)/270G/(N) REALIGNMENT No. Function Choices Display Remarks No. Function Choices Display Remarks 5 [2]TK-270G No Function KEY3_OFF 2 [Side2] Monitor C MON_19 only Talk Around KEY3_3 Default Monitor D MON_20 Display Character KEY3_5 RF Power Low MON_21 Home Channel KEY3_7 Scan MON_22 * TK-260G cannot be selected.
  • Page 16 TK-260G/(N)/270G/(N) REALIGNMENT No. Function Choices Display Remarks No. Function Choices Display Remarks 12 TOT OFF,1-10/ TOTP_PFF Cannot be set when TOT is OFF. 37 Group Code A-D,*,# GPCD_OFF_ Default;OFF Pre-Alert Time 1s Step Default:OFF 38 Auto Rest OFF ART_OFF_ 13 TOT OFF1-60/ TOTK_OFF Cannot be set when TOT is OFF.
  • Page 17 TK-260G/(N)/270G/(N) REALIGNMENT 8-4. Memory Reset Mode Flow Chart This mode is used to clear data for functions that can be set Function Setting Mode in Self Programming Mode or to return to reset values (default). [Side1] [Side1] ° Group code Self programming mode Squelch level Pressing [...

  • Page 18: Disassembly For Repair

    TK-260G/(N)/270G/(N) 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 19: Circuit Description

    TK-260G/(N)/270G/(N) 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 (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 20 TK-260G/(N)/270G/(N) CIRCUIT DESCRIPTION 5) Audio amplifier circuit (3) DTMF 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 21: Power Supply

    TK-260G/(N)/270G/(N) 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 22 TK-260G/(N)/270G/(N) 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 23 TK-260G/(N)/270G/(N) 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. Connected to the microprocessor.

  • Page 24: Semiconductor Data

    TK-260G/(N)/270G/(N) SEMICONDUCTOR DATA Microprocessor : 30622M4102GP (TX-RX UNIT : IC13) Pin function Port Port Function Function Name Name Chip select signal TX:Automatic Power Control data output Not used RX:BPF tuning data 50-59 A18-A9 Flash memory address bus DTMF DTMF/2TONE BEEP output 2TONE decode pulse input Flash memory address bus DTMSTD...

  • Page 25: Description Of Components

    TK-260G/(N)/270G/(N) DESCRIPTION OF COMPONENTS DISPLAY UNIT (X54-3250-10) (TK-270G Only) Ref. No. Use/Function Operation/Condition Ref. No. Use/Function Operation/Condition Transistor DC switch / W/N audio amplitude adjust IC501 LCD driver Transistor DC switch / LED (Red) Q501 Transistor Current driver / LCD back light LED AVR Q502 Transistor DC switch...

  • Page 26: Parts List

    TK-260G/(N)/270G/(N) PARTS LIST...

  • Page 27: Parts List

    TK-260G/(N)/270G/(N) PARTS LIST ∗ New Parts. indicates safety critical components. Parts without Parts No. are not supplied. L: Scandinavia K: USA P: Canada Y: PX (Far East, Hawaii) T: England E: Europe Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No.
  • Page 28 TK-260G/(N)/270G/(N) PARTS LIST DISPLAY UNIT (X54-3250-10) TX-RX UNIT (X57-5872-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts R523 RK73GB1J473J CHIP R J 1/16W C92-0514-05 CHIP-TAN 2.2UF 10WV R524 RK73GB1J471J CHIP R J 1/16W CC73GCH1H050B CHIP C 5.0PF B...
  • Page 29 TK-260G/(N)/270G/(N) PARTS LIST TX-RX UNIT (X57-5872-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts C132 CK73GB1H103K CHIP C 0.010UF K C215 CK73GB1C104K CHIP C 0.10UF K C133 CC73GCH1H820J CHIP C 82PF C216 CK73GB1H332K CHIP C 3300PF K...
  • Page 30 TK-260G/(N)/270G/(N) PARTS LIST TX-RX UNIT (X57-5872-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts L40-8285-85 SMALL FIXED INDUCTOR(0.82U) A,B,D,E C311 CC73GCH1H120G CHIP C 12PF L92-0138-05 FERRITE CHIP C311 CC73GCH1H180G CHIP C 18PF A,B,D,E L92-0149-05 FERRITE CHIP...
  • Page 31 TK-260G/(N)/270G/(N) PARTS LIST TX-RX UNIT (X57-5872-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts RK73GB1J183J CHIP R J 1/16W R106 RK73GB1J272J CHIP R 2.7K J 1/16W RK73GB1J101J CHIP R J 1/16W R107 RK73GB1J470J CHIP R J 1/16W...
  • Page 32 TK-260G/(N)/270G/(N) PARTS LIST TX-RX UNIT (X57-5872-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts R169 RK73GB1J473J CHIP R J 1/16W R250 RK73GB1J472J CHIP R 4.7K J 1/16W R170 RK73GB1J394J CHIP R 390K J 1/16W R251 RK73GB1J474J...
  • Page 33 TK-260G/(N)/270G/(N) PARTS LIST TX-RX UNIT (X57-5872-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts S-81350HG-KD IC(VOLTAGE REGULATOR) PST9140NR IC(RESET SW) RN5VL45C IC(REGULATOR) IC10 AT2408N10SI2.5 IC(8bit SERIAL EEPROM) IC11 TA7368F IC(AF POWER AMP) IC12 AT29C020-90TI IC13...

  • Page 34: Exploded View

    TK-260G/(N)/270G/(N) EXPLODED VIEW (TK-260G) 49 37 TX-RX unit (A/2) A M3.6x4 :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 I M2x5 :N67-2005-46 J φ 2x4.5 :N78-2045-46 K φ...
  • Page 35 TK-260G/(N)/270G/(N) EXPLODED VIEW (TK-270G) 49 37 DISPLAY unit J32-0925-04 TX-RX unit (A/2) TX-RX unit (B/2) A M3.6x4 :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 36: Packing

    TK-260G/(N)/270G/(N) PACKING 32.PACKING FIXTURE (H12-1487-02) 33.PROTECTION BAG (H25-0085-04) 45. BELT HOOK (J29-0624-03) ANT. HELICAL ANTENNA (T90-0695-15) : E, (N)E 34. PROTECTION BAG 7. INSTRUCTION MANUAL (T90-0680-05) : (N)T (H25-2012-04) (B62-1293-10) : 260G (T90-0681-05) : (N)E2 INSTRUCTION MANUAL (B62-1294-10) : 270G 4.

  • Page 37: Adjustment

    TK-260G/(N)/270G/(N) ADJUSTMENT Test Equipment Required for Alignment Test Equipment Major Specifications Standard Signal Generator Frequency Range 136 to 150MHz ((N)E2) 146 to 174MHz (E, (N)E). (SSG) Modulation Frequency modulation and external modulation. Output -127dBm/0.1µV to greater than -47dBm/1mV Power Meter Input Impedance 50Ω.
  • Page 38 TK-260G/(N)/270G/(N) ADJUSTMENT The following parts are required for adjustment Repair Jig (Extention Flat cable : part No. E37-0851-05) 1. Antenna connector adapter The antenna connector of this radio uses an SMA terminal. This cable is used for connecting the TK-270G display unit Use an antenna connector adapter [SMA(f) –...
  • Page 39 TK-260G/(N)/270G/(N) ADJUSTMENT • Transceiver tuning Frequency and signalling (To place the transceiver in tuning mode) The set has been adjusted for the frequencies shown in the Channel appears on the LCD. Set the channel according to following table. When required. re-adjust them following the the tuning requirements.
  • Page 40 TK-260G/(N)/270G/(N) ADJUSTMENT Tuning mode H P O W Hi Power Hi Power (Low) Hi Power (Low’ ) Hi Power (Cen) Hi Power (Hi’) Hi Power (Hi) L P O W Low Power Low Power (Low) Low Power (Low’) Low Power (Cen) Low Power (Hi’) Low Power (Hi) Narrow...
  • Page 41 TK-260G/(N)/270G/(N) 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. Note Precision parts are used for the PTT, side1, and side2 switches. In order to avoid damaging these switches, do not press them using your fingers.
  • Page 42 TK-260G/(N)/270G/(N) ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method 6. Low Power [Panel Test Mode] Freq. Counter Check 1) CH-Sig:1-1 Power meter Check 0.5~1.5W Set low power (Push [2]) Am meter 1.2A or less PTT:ON 2) CH-Sig:2-1 PTT:ON 3) CH-Sig:3-1 PTT:ON...
  • Page 43 TK-260G/(N)/270G/(N) ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method 11.DQT VCO 1) Adj item [VDQT] Power meter Encoder Make the Balance Adjust [∗∗∗] Dev meter SP/MIC connector knob demodulation Adjust LPF:3kHz Oscilloscope waves into [Wide 5K] HPF:OFF square waves.
  • Page 44 TK-260G/(N)/270G/(N) ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method Wide 5K:0.75kHz ±50Hz 14.DQT 1) Adj item [FDQT] Power meter Encoder Devition Adjust [∗∗∗] Dev meter SP/MIC connector knob Narrow:0.35kHz Adjust LPF:3kHz Oscilloscope Wide 4K:0.6kHz HPF:OFF [Wide] 2) Adj item D Q T] [Narrow]...
  • Page 45 TK-260G/(N)/270G/(N) ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method 1. Sensitivity Adj item [SENS] Encoder knob : ([S E N S]) : [60] ((N)E2) [81] (E,(N)E) Adjustment Adjust [∗∗∗] : (S S) : [100] ((N)E2) [135] (E,(N)E) E N S] : (S ) : [130] ((N)E2)
  • Page 46 TK-260G/(N)/270G/(N) ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method 3. Sensitivity [Panel Test Mode] Check 1) CH-Sig:1-1 AF VTVM Check 12dB SINAD or SSG OUT Oscilloscope more Wide:-117dBm (MOD:1kHz / ±3kHz) Narrow:-115dBm (MOD:1kHz / ±1.5kHz) Semi wide:-116dBm (MOD:1kHz / ±2.4kHz) 4.
  • Page 47 TK-260G/(N)/270G/(N) ADJUSTMENT Adjustment points TX-RX unit (X57-587) Component side view Foil Side View L307 Battery terminal L305 L306 IC12 IC14 TC1 : Transmit lock voltage adjustment VR1 : Frequency adjustment TC2 : Receive lock voltage adjustment L305: L306: Band-pass filter waveform adjustment L307: BPF : Band-pass filter test point CV(LV) : Lock voltage adjustment terminal.

  • Page 48: Pc Board Views

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

  • Page 49: Tx-Rx Unit (X57-587X-Xx)

    TK-260G/(N)/270G/(N) PC BOARD VIEW TX RX UNIT (X57-587X-XX) Component Side View 2-71:TK260G E, 2-72:TK-260G (N)E, (N)T, 2-73:TK-270G E, 2-74:TK-270G (N)E, (N)T, 2-75:TK-260G (N)E2 TX-RX UNIT (X57-587X-XX) R218 Component Side View C194 R118 R164 C184 R259 C209 R255 R123 R122 C261 C207 R170 C216 R147...
  • Page 50 TK-260G/(N)/270G/(N) PC BOARD VIEW TX RX UNIT (X57-587X-XX) Foil Side View 2-71:TK260G E, 2-72:TK-260G (N)E, (N)T, 2-73:TK-270G E, 2-74:TK-270G (N)E, (N)T, 2-75:TK-260G (N)E2 TX-RX UNIT (X57-587X-XX) Foil Side View C241 C146 R108 R320 MIC1 R258 C126 C131 C108 C107 C139 R248 C115 R247...
  • Page 51 TK-260G/(N)/270G/(N) TX-RX UNIT (X57-587X-XX) PC BOARD VIEW Component Side + Foil Side View TX RX UNIT (X57-587X-XX) Component Side + Foil Side View 2-71:TK260G E, 2-72:TK-260G (N)E, (N)T, 2-73:TK-270G E, 2-74:TK-270G (N)E, (N)T, 2-75:TK-260G (N)E2 R218 C241 C194 C146 R118 R108 R320 R164...

  • Page 52: Schematic Diagram

    TK-260G/(N) SCHEMATIC DIAGRAM • Note) Component marked with a dot ( ) are Parts of pattern 1.
  • Page 53 TK-270G/(N) SCHEMATIC DIAGRAM • Note) Component marked with a dot ( ) are Parts of pattern 1.

  • Page 54: Block Diagram

    TK-260G/(N)/270G/(N) TK-260G/(N)/270G/(N) BLOCK DIAGRAM...

  • Page 55: Level Diagram

    TK-260G/(N)/270G/(N) TK-260G/(N)/270G/(N) KNB-14/KNB-15A (Ni-Cd BATTERY) LEVEL DIAGRAM 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 Breaker Breaker °...

  • Page 56: Options

    TK-260G/(N)/270G/(N) OPTIONS KMC-17 (Speaker microphone) KMC-17 Parts List Description Ref. No. Parts No. 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 Clip assy J39-0601-08 Packing (MIC)

  • Page 57: Specifications

    KENWOOD ELECTRONICS TECHNOLOGIES(S) PTE LTD. KENWOOD ELECTRONICS U.K. LIMITED Sales Marketing Division KENWOOD House, Dwight Road, Watford, Herts., WD1 8EB United Kingdom 1 Ang Mo Kio Street 63, Singapore 569110 KENWOOD ELECTRONICS EUROPE B.V. Amsterdamseweg 37, 1422 AC Uithoorn, The Netherlands...

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