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Kenwood TK-270G - page 1
VHF FM TRANSCEIVER TK-260G/270G © 1999-9 PRINTED IN JAPAN B51-8493-00(S) 1425 SERVICE MANUAL GENERAL ...................................................................... 2 SYSTEM SET-UP .......................................................... 2 OPERATING FEATURES .............................................. 3 REALIGNMENT .................... ...
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Kenwood TK-270G - page 2
TK-260G/270G 2 GENERAL / SYSTEM SET -UP INTRODUCTION SCOPE OF THIS MANUAL This manual is intended for use by experienced technicians familiar with similar types of commercial grade communications equipment. It contains all required service information for the equipment and is current as of the publication date. Changes which may occur after publica ...
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Kenwood TK-270G - page 3
TK-260G/270G 3 OPERA TING FEA TURES 1. Operation Features • TK-260G Antenna A 3 2 1 B 6 5 4 C 9 8 7 D 0 q q q q q e e e e e r r r r r t t t t t y y y y y u u u u u i i i i i o o o o o !0 !0 !0 !0 !0 w w w w w Microphone Speaker The transceiver is shown with the optional KNB-14 battery pack. q q q q q Rotary encoder Y our dealer can program the en ...
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Kenwood TK-270G - page 4
TK-260G/270G 4 OPERA TING FEA TURES u u u u u ° , • , 2 2 2 2 2 , 3 3 3 3 3 keys 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. o o o o o SP/MIC jacks Connect an optional speaker/ microphone here. !0 !0 !0 !0 !0 Display (See page ...
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Kenwood TK-270G - page 5
TK-260G/270G 5 OPERA TING FEA TURES 9) Reverse (REV) (Note: C type only) When the REV switch is pressed, transmission can be performed with the receive frequency and receive signaling, and reception can be performed with the transmit frequency and transmit signaling. When REV is on, HORN ALERT and PUBLIC ADDRESS do not work. 10) Selectable QT (SEL ...
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Kenwood TK-270G - page 6
TK-260G/270G 6 OPERA TING FEA TURES 6 Selected with talkback The transceiver reverts to the channel before scanning or the channel that you changed during scan. 8) Scan End When you reactivate the key programmed to the scan function during scan mode, scan ends. The scan icon ("SCN") and "SCAN" or revert channel (programmable) di ...
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Kenwood TK-270G - page 7
TK-260G/270G 7 OPERA TING FEA TURES 4) Battery Warning This transceiver has a battery warning feature. If low voltage is detected during transmission, the transceiver warns you by a flashing red "LED". When the voltage is detected to be even lower during transmission, the transceiver stops transmission and warns you by a flashing red &quo ...
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Kenwood TK-270G - page 8
TK-260G/270G 8 2000Hz 2000Hz 2000Hz 100ms 100ms 100ms 100ms 100ms • Group Call Tone The group call tone informs the user of a group call in DTMF/ 2 Tone Option Signaling. This tone repeats 7 times. • Individual Tone Individual tone is issued on receiving selective call by DTMF/ 2 Tone Option Signaling. 770Hz 770Hz 30ms 30ms 30ms • Pre Alert t ...
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Kenwood TK-270G - page 9
TK-260G/270G 9 6. Firmware Programming Mode 6-1. Preface Flash memory is mounted on the TK-260G/270G. This allows the TK-260G/270G to be upgraded when new features are released in the future. (For details on how to obtain the firmware, contact Customer Service.) 6-2. Connection procedure Connect the TK-260G/270G to the personal computer (IBM PC or ...
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Kenwood TK-270G - page 10
TK-260G/270G 10 Fig. 2 Cloning cable MBL PSB GND PTT/RXD ME MIC REMOTE/TXD CM GND REMOTE/TXD PTT/RXD 8 1 1 8 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 Pr ...
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Kenwood TK-270G - page 11
TK-260G/270G 11 8-2. Channel Setting Mode This is a mode for making channel settings with the panel keys without using the FPU. Pressing [MON] when "SELF" is displayed, sets Channel Setting Mode. Select an item set using [ 3 ] then change the selection with the encoder. The data displayed using [ 2 ] is stored in the memory and then proce ...
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Kenwood TK-270G - page 12
TK-260G/270G 12 REALIGNMENT ● Flow Chart No. Function Choices Display Remarks 3 TX frequency Step 2.5kHz-1MHz STP_250 Same as RX frequency. STP_1000 Blank ———— 100.0000- T.100.0000 550.0000MHz 4 TX Signaling Same as RX signaling. 5 Option Signaling OFF NONE____ Default DTMF DTMF____ 2-TONE 2TONE___ 6I D 000- ___ID___ Display when an item ...
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Kenwood TK-270G - page 13
TK-260G/270G 13 REALIGNMENT 8-3. Function Setting Mode This is a mode for using the panel keys to make function settings without using the FPU, that operate on all channels. Pressing the [LAMP] when "SELF" is displayed, sets the Function Setting Mode. Select an item set using [ 3 ] then change the selection with the encoder. The data disp ...
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Kenwood TK-270G - page 14
TK-260G/270G 14 No. Function Choices Display Remarks No. Function Choices Display Remarks 4 [ • ] TK-270G Group Up KEY2_25 only Scrambler KEY2_26 Only when scrambler is set 5[ 2 ] TK-270G No Function KEY3_OFF only Talk Around KEY3_3 Default Display Character KEY3_5 Home Channel KEY3_7 Channel Down KEY3_8 Channel Up KEY3_9 Keylock KEY3_10 Lamp KEY ...
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Kenwood TK-270G - page 15
TK-260G/270G 15 No. Function Choices Display Remarks 34 D Key D Code DKA_D_CD Default Assignment 1-16/1s DKA_16__ 35 DTMF Code SQ DTMF_OFF Default Signaling SEL CALL DTMF_SEL 36 Inter Mediaate 0-9,A-D,*,# IMC__#_ Default: # (Can be set only when Code DTMF signaling = SEL CALL.) 37 Group Code 0-9,A-D,*,# GPCD_FF_ Default;OFF 38 Auto Rest OFF ART_OFF ...
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Kenwood TK-270G - page 16
TK-260G/270G 16 DISASSEMBL Y FOR REP AIR Separating the case assembly from the chassis. 1. Remove the two knobs z and three round units x . 2. Remove the two screws c . 3. Expand the right and left sides of the bottom of the case assembly, lift the chassis, and remove it from the case assembly v . 4. Taking cure not to cut the speaker lead b , open ...
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Kenwood TK-270G - page 17
TK-260G/270G 17 Fig. 3 Wide/Narrow changeover circuit CIRCUIT DESCRIPTION 1. Frequency configuration The receiver utilizes double conversion. The first IF is 49.95 MHz and the second IF is 450 kHz. The first local oscillator signal is supplied form the PLL circuit. The PLL circuit in the transmitter generates the necessary frequencies. Fig. 1 shows ...
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Kenwood TK-270G - page 18
TK-260G/270G 18 CIRCUIT DESCRIPTION Fig. 4 AF Amplifier and Squelch Fig. 5 PLL circuit 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 v ...
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Kenwood TK-270G - page 19
TK-260G/270G 19 CIRCUIT DESCRIPTION Fig. 7 Microphone amplifier Fig. 8 Drive and final amplifier and APC circuit 3) UNLOCK DETECTOR If a pulse signal appears at the LD pin of IC2, an unlock condition occurs, and the DC voltage obtained form D1, R1, and C6 causes the voltage applied to the microprocessor to go low. When the microprocessor detects th ...
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Kenwood TK-270G - page 20
TK-260G/270G 20 CIRCUIT DESCRIPTION Low battery warning The red LED flashes during transmission. The red LED flashes and a continuous beep sounds while PTT is pressed. Battery condition The battery voltage is low but the transceiver is still usable. The battery voltage is low and the transceiver is not able to make calls. 6. Control Circuit The con ...
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Kenwood TK-270G - page 21
TK-260G/270G 21 CIRCUIT DESCRIPTION/SEMICONDUCTOR DA T A Fig. 10 Control system 8. CONTROL SYSTEM Keys and channel selector circuit. The signal from the keys and channel selector are directly input to the microprocessor, as shown in fig. 10. SEMICONDUCTOR DATA LCD Driver : LC75823W (Display UNIT IC501) (TK-270G only) ■ Block diagram LA TCH & ...
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Kenwood TK-270G - page 22
TK-260G/270G 22 SEMICONDUCTOR DA T A Microprocesser : 30622M4102GP (TX-RX UNIT : IC13) ■ Pin function 1 APC O TX:Automatic Power Control data output RX:BPF tuning data 2 DTMF O DTMF/2TONE BEEP output 3 2TN I 2TONE decode pulse input 4 DTMSTD I DTMF decode detect detect:H 5 SIM I Destnation selct 6 BYTE I +5V(5M) 7 CNVSS I GND 8 AFSTB O Base Band ...
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Kenwood TK-270G - page 23
TK-260G/270G 23 IC1 IC RF Power Module IC2 IC PLL system IC3 IC Comparator (APC) IC4 IC FM IF system IC5,6 IC Shift register / Output expander IC7 IC Voltage regulator / 5V IC8 IC Voltage detector / Reset IC9 IC Voltage detector / INT IC10 IC EEPROM IC11 IC AF Power amplifier IC12 IC Flash memory IC13 IC Microprocessor IC14 IC Audio processor IC15( ...
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Kenwood TK-270G - page 24
TK-260G/270G P ARTS LIST 24 Parts No. Description Address New parts Destination Destination TK-260G/270G Ref. No. Parts No. Description Address New parts * New Parts. indicates safety critical components. Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No. werden nicht ge ...
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Kenwood TK-270G - page 25
TK-260G/270G P ARTS LIST 25 Ref. No. Parts No. Description Address New parts Ref. No. Parts No. Description Address New parts Destination Destination TX-RX UNIT (X57-5870-10) 260G : TK-260G (K),(M) 270G : TK-270G (K),(M) M : TK-260G(M),TK-270G(M) K : TK-260G(K),TK-270G(K) D507 MA2S111 DIODE IC501 LC75823W IC(MOS-IC) Q501 2SB1132(Q,R) TRANSISTOR Q50 ...
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Kenwood TK-270G - page 26
TK-260G/270G P ARTS LIST 26 Ref. No. Parts No. Description Address New parts Ref. No. Parts No. Description Address New parts Destination Destination TX-RX UNIT (X57-5870-XX) 260G : TK-260G (K),(M) 270G : TK-270G (K),(M) M : TK-260G(M),TK-270G(M) K : TK-260G(K),TK-270G(K) C173 C92-0567-05 CHIP-TAN 68UF 6.3WV C174 CK73GB1H102K CHIP C 1000PF K C176 C ...
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Kenwood TK-270G - page 27
TK-260G/270G P ARTS LIST 27 Ref. No. Parts No. Description Address New parts Ref. No. Parts No. Description Address New parts Destination Destination TX-RX UNIT (X57-5870-XX) 260G : TK-260G (K),(M) 270G : TK-270G (K),(M) M : TK-260G(M),TK-270G(M) K : TK-260G(K),TK-270G(K) R22 RK73GB1J472J CHIP R 4.7K J 1/16W R23 RK73GB1J122J CHIP R 1.2K J 1/16W R26 ...
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Kenwood TK-270G - page 28
TK-260G/270G P ARTS LIST 28 Ref. No. Parts No. Description Address New parts Ref. No. Parts No. Description Address New parts Destination Destination TX-RX UNIT (X57-5870-XX) 260G : TK-260G (K),(M) 270G : TK-270G (K),(M) M : TK-260G(M),TK-270G(M) K : TK-260G(K),TK-270G(K) R92 RK73GB1J100J CHIP R 10 J 1/16W R93 RK73GB1J332J CHIP R 3.3K J 1/16W R94 R ...
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Kenwood TK-270G - page 29
TK-260G/270G P ARTS LIST 29 Ref. No. Parts No. Description Address New parts Ref. No. Parts No. Description Address New parts Destination Destination TX-RX UNIT (X57-5870-XX) 260G : TK-260G (K),(M) 270G : TK-270G (K),(M) M : TK-260G(M),TK-270G(M) K : TK-260G(K),TK-270G(K) R232 RK73GB1J152J CHIP R 1.5K J 1/16W R233 R92-1252-05 CHIP R 0 OHM R234 RK73 ...
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Kenwood TK-270G - page 30
TK-260G/270G 30 A B 1 2 3 EXPLODED VIEW (TK-260G) Parts with the exploded numbers larger than 700 are not supplied. 51 701 2 31 C 53 49 29 24 16 SP 30 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 G M3x4 :N30-3004-46 J φ 2x4.5 :N78-2045-46 K φ 2x3 :N79-2030-46 L φ 2x5 : ...
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Kenwood TK-270G - page 31
TK-260G/270G 31 C D 1 2 3 EXPLODED VIEW (TK-270G) Parts with the exploded numbers larger than 700 are not supplied. 2.5 4 4 M2 M3 J32-0925-04 J 51 701 1 31 C 48 49 23 27 SP 16 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 2 ...
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Kenwood TK-270G - page 32
TK-260G/270G 32 E F 1 2 3 P ACKING 32.PACKING FIXTURE (H12-1487-02) 4. CAP (SP/MIC) (B09-0351-03) 34.PROTECTION BAG (H25-2012-04) 45.BELT HOOK (J29-0624-03) 7. WARRANTY CARD (B46-0470-00) : K 33.PROTECTION BAG (H25-0085-04) 8. INSTRUCTION MANUAL (B62-1113-00) : 270G 9. INSTRUCTION MANUAL (B62-1129-00) : 260G 41.SP/MIC HOLDER (J21-4493-04) M. SCREW ...
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Kenwood TK-270G - page 33
TK-260G/270G 33 ADJUSTMENT Test Equipment Required for Alignment Test Equipment Major Specifications 1. Standard Signal Generator Frequency Range 150 to 175MHz (SSG) Modulation Frequency modulation and external modulation. Output -127dBm/0.1 µ V to greater than -47dBm/1mV 2. Power Meter Input Impedance 50 Ω . Operation Frequency 150 to 175MHz or ...
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Kenwood TK-270G - page 34
TK-260G/270G 34 • Preparations for tuning the transceiver Before attempting to tune the transceiver, connect the unit to a suitable power supply. Whenever the transmitter is tuned, the unit must be connected to a suitable dummy load (i.e. power meter). The speaker output connector must be terminated with a 8 Ω dummy load and connected to an AC ...
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Kenwood TK-270G - page 35
TK-260G/270G 35 H.P.O.W. . 1. ADJUSTMENT K,M 150-174(MHz) TEST Ch RX frequency (MHz) TX frequency (MHz) L 150.05000 150.00000 L’ 156.05000 156.00000 M 162.05000 162.00000 H’ 168.05000 168.00000 H 173.95000 174.00000 Press [ ° ], to enter tuning mode. Use the [ 2 ] key to write tuning data through the tuning modes, and the channel selector knob ...
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Kenwood TK-270G - page 36
TK-260G/270G 36 Common Section Item Condition Measurement Adjustment Specifications/ Test equipment Terminal Parts Method Remark 1. Setting 1) BATT terminal voltage:7.5V 2) SSG Standard modulation [Wide] MOD:1kHz, DEV:3kHz [Narrow] MOD:1kHz, DEV:1.5kHz 2. VCO lock [Panel Test Mode] voltage 1) CH-Sig:2-1 Power meter ANT Check 0.8V or more RX 2) CH-S ...
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Kenwood TK-270G - page 37
TK-260G/270G 37 ADJUSTMENT Item Condition Measurement Adjustment Specifications/ Test equipment Terminal Parts Method Remark 7. Max DEV 1) Adj item [MAX] Power meter ANT Encoder 4.2kHz ± 50Hz Adjust Adjust [ ∗∗∗ ] Dev meter SP/MIC connector knob (According to [Wide] AG:1kHz / 150mV Oscilloscope the larger +,-) Dev meter filter AG LPF:15kHz A ...
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Kenwood TK-270G - page 38
TK-260G/270G 38 ADJUSTMENT Item Condition Measurement Adjustment Specifications/ Test equipment Terminal Parts Method Remark 14.DQT 1) Adj item [FDQT] Power meter ANT 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 [F . D Q T] ➞ [F . D ...
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Kenwood TK-270G - page 39
TK-260G/270G 39 ADJUSTMENT Item Condition Measurement Adjustment Specifications/ Test equipment Terminal Parts Method Remark 1. Sensitivity Adj item [SENS] DVM Encoder knob f L : ([S . E N S]) : [88] Adjustment Adjust [ ∗∗∗ ] f C : ( S . E . N . S) : [134] f L f c f H [S . E N S] ➞ [S . E . N . S] ➞ [S . E . N . S . . ]f H : (S . E . N . ...
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Kenwood TK-270G - page 40
TK-260G/270G 40 ADJUSTMENT Adjustment points TX-RX unit (X57-587) Component side view Foil Side View VR1 : Frequency adjustment TC1 : Transmit lock voltage 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. Fig. 2 Adjust ...
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Kenwood TK-270G - page 41
AB C DE FG H I J K L M N O P Q RS 1 3 4 5 6 7 8 9 10 11 12 13 14 2 41 42 TK-260G/270G DISPLAY UNIT (X54-3250-10) Component Side View PC BOARD VIEW DISPLAY UNIT (X54-3250-10) Foil Side View D506 LCD D508 D509 D510 LED J72-0663-02 direction D51 1 D512 D513 D514 D515 123 A 456 B 789 C 0# D D516 C501 C502 C503 1 16 SB KOUT3 KOUT2 KOUT1 KOUT0 KIN4 KIN3 ...
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Kenwood TK-270G - page 42
AB C DE FG H I J K L M N O P Q RS 1 3 4 5 6 7 8 9 10 11 12 13 14 2 44 43 TK-260G/270G Component side Foil side Pattern 1 Pattern 2 Pattern 3 Pattern 4 TX RX UNIT (X57-5870-XX) Component Side View 0-10:TK260G K,M, 0-11:TK-270G K, 0-21:TK-270G M PC BOARD VIEW . O N . f e Rs s e r d d A 1 C IE 8 3 C IF 6 5 C IO 4 6 C IP 4 0 1 C IN 4 1 1 C ID 5 2 1 C I ...
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Kenwood TK-270G - page 43
AB C DE FG H I J K L M N O P Q RS 1 3 4 5 6 7 8 9 10 11 12 13 14 2 46 45 TK-260G/270G Component side Foil side Pattern 1 Pattern 2 Pattern 3 Pattern 4 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 . O N . f e Rs s e r d d A 2 C IH 7 4 C IJ 4 7 C ID 8 8 C ID 5 9 C ID 6 1 0 3 C IL 8 1 QI 8 2 QK ...
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Kenwood TK-270G - page 44
AB C DE FG H I J K L M N O P Q RS 1 3 4 5 6 7 8 9 10 11 12 13 14 2 48 47 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 Component side Foil side Pattern 1 Pattern 2 Pattern 3 Pattern 4 TX-RX UNIT (X57-5870-XX) Component Side + Foil Side View DT A1 14EE DT A1 14YE D ...
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Kenwood TK-270G - page 45
A B C D E F G I H J K L M O N P Q S R 1 2 3 4 5 6 7 TK-260G SCHEMA TIC DIAGRAM Note) Component marked with a dot ( • ) are Parts of pattern 1. ...
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Kenwood TK-270G - page 46
T U V W X Y Z AB AA AC AD AE AF AH AG AI AJ AL AK 1 2 3 4 5 6 7 TK-270G SCHEMA TIC DIAGRAM Note) Component marked with a dot ( • ) are Parts of pattern 1. ...
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Kenwood TK-270G - page 47
57 58 TK-260G/270G TK-260G/270G BLOCK DIAGRAM ...
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Kenwood TK-270G - page 48
60 59 KNB-14/KNB-15A (Ni-Cd BATTERY) LEVEL DIAGRAM T o make measurements in the AF section, con- nect the AC level meter . (ANT input : -53dBm, 1kHz FM, 3kHz DEV(WIDE).) In the RF section, use a 1000pF coupling capaci- tor . (The display shows the SSG input value re- quired to obtain 12dB SINAD Without Local Level.) AG is set to the MIC input becom ...
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Kenwood TK-270G - page 49
TK-260G/270G 61 OPTIONS Parts No. Description New parts Ref. No. A02-0907-08 Case (Front) A02-0908-08 Case (Rear) B09-0316-08 Cap 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) N46-2605-60 Screw (Clip assy) N46-3016- ...
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Kenwood TK-270G - page 50
TK-260G/270G 62 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 ............ ...
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