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Kenwood TK-260G Service Manual

Kenwood two-way radio - two way radio user manual.
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VHF FM TRANSCEIVER
TK-260G/270G
SERVICE MANUAL
Knob (PTT)
(K29-5334-13)
Knob (MONI)
(K29-5333-13)
TK-260G
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
Antenna
(T90-0679-05):M
Knob (CHANNEL SELECTOR)
(K29-5341-03)
Knob (VOL)
(K29-5332-03)
Cabinet assy
(A02-2391-23)
Knob (PTT)
(K29-5334-13)
Knob (MONI)
(K29-5333-13)
M market models are shown.
CONTENTS
©
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)
TK-270G
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

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Table of Contents

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   Summary of Contents for Kenwood TK-260G

  • Page 1: Table Of Contents

    VHF FM TRANSCEIVER TK-260G/270G SERVICE MANUAL Knob (CHANNEL SELECTOR) (K29-5341-03) Knob (PTT) (K29-5334-13) Knob (MONI) (K29-5333-13) TK-260G M market models are shown. GENERAL ... 2 SYSTEM SET-UP ... 2 OPERATING FEATURES ... 3 REALIGNMENT ... 8 DISASSEMBLY FOR REPAIR ... 16 CIRCUIT DESCRIPTION ...
  • Page 2: General

    This radio is designed for easy servicing. Refer to the schematic diagrams, printed circuit board views, and alignment procedures contained within. NOTE WE CANNOT guarantee oscillator stability when using channel element manufactured by other than KENWOOD or its authorized agents. Frequency range Remarks 0-10 –...
  • Page 3: Operating Features

    1. Operation Features • TK-260G Channel selector Rotate to select a channel (1 ~ 8). Antenna LED indicator Lights red while transmitting. Lights green while receiving. Flashes orange while receiving a 2-Tone or DTMF signal that matches the one set up in your transceiver.
  • Page 4 TK-260G/270G • , 2 2 2 2 2 ,3 3 3 3 3 keys u u u u u These are PF (Programmable Function) keys. Press each key to activate its auxiliary function. i i i i i DTMF keypad Used for storing and transmitting DTMF numbers.
  • Page 5 3 Press PTT switch and 2-Tone Encode Select key to transmit and release them to receive. Note: The code for the TK-260G is not selectable. You cannot change the tone in step 2 by using the Channel Up and Channel Down keys.
  • Page 6 TK-260G/270G 3) Scan Stop Condition The scan stops temporarily if the following conditions are satisfied. 1 The receiving signal matches the signalling code in your radio that is set by the programming software (KPG-56D). 2 When the Monitor key is depressed.
  • Page 7 D.B.D. code + "#" is received. Transpond is always activated when the D.B.D code matches. Alert is not output. An Option Signaling match is not displayed. TK-260G/270G Alert/Transpond AF Mute Open Triggers only for match with...
  • Page 8: Realignment

    TK-260G/270G OPERATING FEATURES / REALIGNMENT 7. Audible user feedback tones The transceiver outputs various combinations of tones to notify the user of the transceiver operating state. The main tones are listed below The high tone is 1477Hz, the mid tone is 941Hz, and the low tone is 770Hz.
  • Page 9 Setup item. 4. Set the firmware to be updated by File select (=F1). 5. Hold down the [LAMP] and [MON] switches on the TK-260G/ 270G, and press the power switch. When the [LAMP] and [MON] switches are held down for two seconds, "PROG576"...
  • Page 10 TK-260G/270G 9. If you want to continue programming other TK-260G/ 270Gs, repeat steps 5 to 8. Notes: To start the Firmware Programmer from KPG-56D, the Fpro path must be set up by the KPG-56D Setup. This mode cannot be entered if the Firmware Programming mode is set to Disable in the Programming software (KPG- 56D).
  • Page 11 The data displayed using [2] is stored in the memory and then proceeds to the next item. Pressing [3] proceeds to the next item without storing it in the memory. Press [MON] to set the display to "SELF" and return to reset (default) status. TK-260G/270G REALIGNMENT Mobile [CH] [CH]...
  • Page 12 9 RF Power High Power PWR_H___ Low Power PWR_L___ 10 Wide/Narrow Wide WIDE____ Narrow NARROW__ 11 Scan DELETE SCAN_DEL Not used for TK-260G Delete/ADD ADD SCAN_ADD 12 Priority P.CH_NO__ Not used when (Scan) Priority is not Fixed. Channel P.CH_YES_ 13 Home Channel No H.CH_NO__ Not used when Home Channel is...
  • Page 13 No. Function Choices Display Function Key 1 [LAMP] No Function LAMP_OFF Talk Around LAMP_3 * TK-260G cannot be selected. Display Character LAMP_5 * TK-260G cannot be selected. Home Channel LAMP_7 * TK-260G cannot be selected. Channel Down LAMP_8 * TK-260G cannot be selected.
  • Page 14 TK-260G/270G No. Function Choices Display • ]TK-270G Group Up KEY2_25 only Scrambler KEY2_26 5 [2]TK-270G No Function KEY3_OFF only Talk Around KEY3_3 Display Character KEY3_5 Home Channel KEY3_7 Channel Down KEY3_8 Channel Up KEY3_9 Keylock KEY3_10 Lamp KEY3_11 Selectable QT KEY3_15...
  • Page 15 When the [ ] switch is pressed while "SELF" is displayed, the memory is reset. When the memory is reset, mode data and model data are not reset. The TK-260G cannot reset the memory. Flow Chart Function Setting Mode Self programming mode...
  • Page 16: Disassembly For Repair

    DISASSEMBLY FOR REPAIR Separating the chassis from the unit. • TK-260G 1. Remove the twelve small screws screws 2. Remove the solder from the antenna terminal using a soldering iron, then lift the unit off (X57).
  • Page 17: Circuit Description

    Q23 turns on/off with the Wide/Narrow data and the IC4 AF AMP detector output level is changed to maintain a constant AF VOL IC11 output level during wide or narrow signals. MUTE Fig. 3 Wide/Narrow changeover circuit TK-260G/270G R105 FM IF SYSTEM "H" : Wide "L" : Narrow...
  • Page 18 TK-260G/270G 5) Audio amplifier circuit The demodulated signal from IC4 is amplified by IC16 (2/ 2), high-pass filtered, low-pass filtered, high-pass filtered, band-eliminate filtered, and de-emphasized by IC14. The signal then goes through an AF amplifier IC15 (2/2), an AF volume control (VR2), and is routed to an audio power amplifier (IC11) where it is amplified and output to the speaker.
  • Page 19: Power Supply

    5C is a common 5V and is output when SAVE is not set to OFF. 5R is 5V for reception and output during reception. 5T is 5V for transmission and output during transmission. TK-260G/270G DRIVE POWER AMP (1/2) (2/2)
  • Page 20 TK-260G/270G 6. Control Circuit The control circuit consists of a microprocessor (IC13) and its peripheral circuits. It controls the TX-RX unit and transfers data to and from the display unit. IC13 mainly performs the following: (1) Switching between transmission and reception by the PTT signal input.
  • Page 21: Semiconductor Data

    The signal from the keys and channel selector are directly input to the microprocessor, as shown in fig. 10. Channel selector KEYAD IC13 -COM TK-260G CN501 TK-270G Fig. 10 Control system SEMICONDUCTOR DATA LCD Driver : LC75823W (Display UNIT IC501)
  • Page 22 Option board port 1 AUX1 Req/Ack input SFTSTB Shift register strobe output Encoder pulse input 1 DACS Chip select output(Max dev) CH selector input (TK-260G) AUX4 Option board port 4 Data output Option board port 2 AUX2 Data input *E Tunk: Synchronizing input...
  • Page 23: Description Of Components

    Diode Diode Variable D302,303,305 capacitance diode / TX driver / 5R / 5T, Save / 5T, Save TK-260G/270G Operation/Condition DC switch / W/N audio amplitude adjust DC switch / LED (Red) DC Switch / LED (Green) DC switch / Squelch...
  • Page 24: Parts List

    J32-0925-04 HEXAGON BOSS K29-5330-02 KEY TOP(DTMF) K29-5331-03 KNOB(ENCODER) 1B,1D K29-5332-03 KNOB(VOLUME) 260G : TK-260G (K),(M) M : TK-260G(M),TK-270G(M) 270G : TK-270G (K),(M) K : TK-260G(K),TK-270G(K) PARTS LIST L: Scandinavia Y: PX (Far East, Hawaii) T: England Y: AAFES (Europe) Description Destination Ref.
  • Page 25 Parts No. parts D507 MA2S111 DIODE IC501 LC75823W IC(MOS-IC) Q501 2SB1132(Q,R) TRANSISTOR Q502 2SC4617(S) TRANSISTOR TX-RX UNIT (X57-5870-XX) -10:TK-260G K,M -11:TK-270G K -21:TK-270G M B30-2019-05 LED(RED/GRN) CK73GB1H471K CHIP C C3,4 CC73GCH1H070B CHIP C CC73GCH1H100C CHIP C CK73GB1C104K CHIP C CC73GCH1H030B...
  • Page 26 C243 CK73FB1A105K CHIP C C244 C92-0560-05 CHIP-TAN C245 CK73GB1H471K CHIP C C246 CK73FB1A105K CHIP C 260G : TK-260G (K),(M) M : TK-260G(M),TK-270G(M) 270G : TK-270G (K),(M) K : TK-260G(K),TK-270G(K) PARTS LIST Description Destination Ref. No. Address C247 68UF 6.3WV C248...
  • Page 27 CHIP R RK73GB1J103J CHIP R RK73GB1J124J CHIP R RK73GB1J332J CHIP R RK73GB1J122J CHIP R RK73GB1J221J CHIP R 260G : TK-260G (K),(M) M : TK-260G(M),TK-270G(M) 270G : TK-270G (K),(M) K : TK-260G(K),TK-270G(K) PARTS LIST Description Destination Ref. No. Address R28 ,29 (16.8MHZ) (3.58MHZ)
  • Page 28 RK73GB1J104J CHIP R R154 RK73GB1J564J CHIP R R155 RK73GB1J473J CHIP R R156 RN73GH1J683D CHIP R 260G : TK-260G (K),(M) M : TK-260G(M),TK-270G(M) 270G : TK-270G (K),(M) K : TK-260G(K),TK-270G(K) PARTS LIST Description Destination Ref. No. Address R157 J 1/16W R158 3.3K...
  • Page 29 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) PARTS LIST Description Destination Ref. No. Address 1.5K J 1/16W 0 OHM...
  • Page 30: Exploded View

    TK-260G/270G 50 37 TX-RX unit (A/2) TX-RX unit (B/2) EXPLODED VIEW (TK-260G) Parts with the exploded numbers larger than 700 are not supplied. A M2.6x4 :N09-2319-05 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...
  • Page 31 EXPLODED VIEW (TK-270G) 50 37 J32-0925-04 TX-RX unit (A/2) TX-RX unit (B/2) DISPLAY unit Parts with the exploded numbers larger than 700 are not supplied. TK-260G/270G 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...
  • Page 32: Packing

    TK-260G/270G 32.PACKING FIXTURE (H12-1487-02) 34.PROTECTION BAG (H25-2012-04) 4. CAP (SP/MIC) (B09-0351-03) 41.SP/MIC HOLDER M. SCREW SET (J21-4493-04) PACKING 7. WARRANTY CARD 45.BELT HOOK (J29-0624-03) ANT. HELICAL ANTENNA (T90-0679-05) : M (N99-2012-05) 32.PACKING FIXTURE (H12-1487-02) 33.PROTECTION BAG (H25-0085-04) (B46-0470-00) : K 8.
  • Page 33: Adjustment

    SMA(f) – N(f)] for adjustment. (The adapter is not provided as an option, so buy a commercially-available one.) Note When the antenna connector adapter touches the knob, draw out the knob to mount the connector. TK-260G/270G ADJUSTMENT Major Specifications 150 to 175MHz Frequency modulation and external modulation.
  • Page 34 TK-260G/270G Repair Jig (Extention Flat cable : part No. E37-0851-05) This cable is used for connecting the TK-270G display unit and TX/RX unit when you test or repair the transceiver. Display unit Caution : You must connect TK-270G display unit when you test or repair the transceiver.
  • Page 35 QT TCXO balance(W,C) D Q T DQT VCO balance(W,L) DQT VCO balance(W,C) D Q T QT TCXO balance(W,L) QT TCXO balance(W,C) R S S I RSSI (Wide) TK-260G/270G 150-174(MHz) RX frequency (MHz) TX frequency (MHz) 150.05000 150.00000 156.05000 156.00000 162.05000 162.00000...
  • Page 36: Common Section

    TK-260G/270G 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 Item Condition 1. Setting 1) BATT terminal voltage:7.5V 2) SSG Standard modulation [Wide] MOD:1kHz, DEV:3kHz [Narrow] MOD:1kHz, DEV:1.5kHz...
  • Page 37 Measurement Test equipment Terminal Power meter Dev meter SP/MIC connector Oscilloscope AF VTVM Power meter Dev meter SP/MIC connector Oscilloscope AF VTVM TK-260G/270G Adjustment Specifications/ Remark Parts Method Encoder 4.2kHz 50Hz knob (According to the larger +,-) 2.1kHz (According to...
  • Page 38 TK-260G/270G Item Condition 14.DQT 1) Adj item [FDQT] Devition Adjust [ Adjust LPF:3kHz HPF:OFF [Wide] 2) Adj item D Q T] Adjust [ PTT:ON [Narrow] 3) Adj item [FDQT Adjust [ PTT:ON 15.DTMF 1) Adj item [DTMF] Deviation Adjust [...
  • Page 39 Measurement Test equipment Terminal Encoder knob Tracking generator L305, L306, L307 spectrum analyzer Fig. 1 BPF-WAVE AF VTVM Oscilloscope TK-260G/270G Adjustment Specifications/ Remark Parts Method : ([S E N S]) : [88] : (S S) : [134] : (S ) : [180] Adjust wave form to figure 1.(f...
  • Page 40 TK-260G/270G Adjustment points TX-RX unit (X57-587) Component side view IC12 IC14 VR1 : Frequency adjustment ADJUSTMENT Foil Side View TC1 : Transmit lock voltage adjustment TC2 : Receive lock voltage adjustment L305: L306: L307: BPF : Band-pass filter test point CV(LV) : Lock voltage adjustment terminal.
  • Page 41: Pc Board Views

    Component Side Foil Side DISPLAY UNIT (X54-3250-10) Foil Side View R518 Q501 D515 D508 R519 D509 D510 d i r e c t i o n TK-260G/270G PC BOARD VIEW R513 IC501 C515 Q502 R517 R522 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 R185 R135 C176 R131 R130 R139 R127 R166 R151 S401 Component side Pattern 1 30622M4102GP Pattern 2 Pattern 3 Pattern 4 Foil side...
  • Page 43 C107 C115 C124 C130 C136 C137 C135 C109 XOUT R257 R301 C113 C122 2SC4988 UPA572T 2SK508NV(K52) 2SJ243 S-81350HG-KD 3SK228 TK-260G/270G PC BOARD VIEW C241 C126 C324 R314 C320 C310 C319 R305 R302 R303 R304 L307 L308 L305 L306 C301 R318...
  • Page 44 TK-260G/270G PC BOARD 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 C241 MIC1 R185 R135 C176 R131 R130 C324 R139 C310 R127 R305 R302 R166 L307 R151 Component side Pattern 1...
  • Page 45: Schematic Diagram

    TK-260G SCHEMATIC DIAGRAM • Note) Component marked with a dot ( ) are Parts of pattern 1.
  • Page 46 TK-270G SCHEMATIC DIAGRAM • Note) Component marked with a dot ( ) are Parts of pattern 1.
  • Page 47: Block Diagram

    TK-260G/270G TK-260G/270G BLOCK DIAGRAM...
  • Page 48: Level Diagram

    TK-260G/270G LEVEL DIAGRAM TK-260G/270G KNB-14/KNB-15A (Ni-Cd BATTERY) KNB-14 CIRCUIT DIAGRAM Voltage Charging current Dimensions Discharge pin side Charger and charging time: KSC-15 (normal charger), approximately 8 hours Breaker Breaker (70 5 C) (80 5 C) KSC-16 (rapid charger), approximately 1 hour...
  • Page 49 KMC-17 (Speaker microphone) KMC-21 (Speaker microphone) TK-260G/270G OPTIONS KMC-17 Parts List Ref. No. Parts No. parts A02-0907-08 A02-0908-08 B09-0316-08 D10-0606-08 E11-0421-05 E30-3138-08 F07-0889-08 G53-0569-08 J29-0440-08 J39-0601-08 N46-2605-60 N46-3016-60 N80-2005-41 S50-1415-05 T07-0290-05 T91-0534-08 KMC-21 Parts List Ref. No. Parts No. parts...
  • Page 50 TK-260G/270G 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 ... 7.5 VDC Battery Life ...

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