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Kenwood TK-272G Service Manual
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Kenwood TK-272G Service Manual

Vhf fm transceiver
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VHF FM TRANSCEIVER
TK-272G
SERVICE MANUAL
GENERAL ...................................................................... 2
SYSTEM SET-UP .......................................................... 2
OPERATING FEATURES .............................................. 3
REALIGNMENT ............................................................. 7
DISASSEMBLY FOR REPAIR ..................................... 15
CIRCUIT DESCRIPTION ............................................. 16
SEMICONDUCTOR DATA .......................................... 20
DESCRIPTION OF COMPONENTS ............................ 22
PARTS LIST ................................................................. 23
EXPLODED VIEW ....................................................... 30
PACKING ..................................................................... 31
Antenna
(KRA-14:Option)
Knob (PTT)
(K29-5334-13)
Knob (Side1)
(K29-5333-13)
CONTENTS
©
B51-8560-00(S) 790
Knob (ENC)
(K29-5331-03)
Knob (VOL)
(K29-5332-03)
Cabinet assy
(A02-3568-23)
Key top (DTMF)
(K29-9043-02)
ADJUSTMENT ............................................................. 32
DISPLAY UNIT (X54-3250-10) ............................... 41
TX-RX UNIT (X57-587X-XX) .................................. 43
SCHEMATIC DIAGRAM .............................................. 49
BLOCK DIAGRAM ....................................................... 53
LEVEL DIAGRAM ........................................................ 55
KNB-14/KNB-15A (Ni-Cd BATTERY) .......................... 56
OPTIONS ..................................................................... 57
SPECIFICATIONS ................................... BACK COVER
2000-11 PRINTED IN JAPAN

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  • Page 1: Table Of Contents

    VHF FM TRANSCEIVER TK-272G SERVICE MANUAL © 2000-11 PRINTED IN JAPAN B51-8560-00(S) 790 Antenna (KRA-14:Option) Knob (ENC) (K29-5331-03) Knob (VOL) (K29-5332-03) Cabinet assy (A02-3568-23) Knob (PTT) (K29-5334-13) Knob (Side1) (K29-5333-13) Key top (DTMF) (K29-9043-02) CONTENTS GENERAL ..............2 ADJUSTMENT ............. 32 SYSTEM SET-UP ............

  • Page 2: General

    SYSTEM SET-UP Merchandise received License and frequency allocated by FCC Frequency range (MHz) RF power Type TX/RX 150~174 5.0W TK-272G K Choose the type of transceiver TX/RX 136~150 5.0W TK-272G K2 Transceiver programming A personal computer (IBM PC or compatible), programming interface (KPG-22), and programming software (KPG-56D) are required for programming.

  • Page 3: Operating Features

    TK-272G OPERATING FEATURES 1. Operation Features o o o o o Display Note: The PF keys are programmed with default functions: • Side 1 key: Lamp Antenna • Side 2 key: Monitor A e e e e e q q q q q w w w w w •...
  • Page 4 TK-272G OPERATING FEATURES The "Add" channel is contained in the scan sequence, the 4) Home Channel "Delete" channel is not contained. In the scan mode, this key Press this key once, the channel switches to the pre- switches the channel between delete or add, temporarily.
  • Page 5 TK-272G OPERATING FEATURES Multiple Group Scan channel to answer to the call however revert channel is set You can scan all valid (ADD) channels in all valid (ADD) to priority channel. groups. After resume time, scan re-starts and the transmission channel returns to the priority channel.
  • Page 6 TK-272G OPERATING FEATURES The transceiver is capable of having ID. The format is DTMF. 6. Option Signalling (DTMF/2 tone) The timing that the transceiver sends the ID is Built-in DTMF decoder is available for option signalling. programmable. Built-in 2-Tone decoder is available for option signalling.

  • Page 7: Realignment

    For the setting method, refer to ADJUSTMENT. 4. Checksum Executing this function, "TUNING" appears on the display of TK-272G while calculating the checksum . When the calculation is completed, the display returns to normal and PC displays the checksum of the radio.
  • Page 8 4. Set the firmware to be updated by File select (=F1). TK-272G to be upgraded when new features are released in 5. Hold down the [Side1] and [Side2] switches on the TK-272G, the future. (For details on how to obtain the firmware, contact and press the power switch.

  • Page 9: Self Programming Mode

    Note : 1. Turn the master TK-272G power ON with the [Side1]+[3] This mode (self programming mode) cannot be set when it keys held down. The TK-272G displays " CLONE ".
  • Page 10 Select 1-128 _1-_1._ We recomend up to 32 CH Both P.ID_3 Channel _1-128._ for TK-272G. 16 Begin of 000- _BOT_ID_ Not valid if Dial ID =Disable and TX ID 9999999999999999 PTT ID=OFF, or EOT is set. 1 RX frequency Step 2.5kHz-1MHz STP_250 Display when an item is selected...
  • Page 11 TK-272G 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...
  • Page 12 TK-272G REALIGNMENT No. Function Choices Display Remarks No. Function Choices Display Remarks 5 [2] Channel Up KEY3_9 2 [Side2] RF Power Low MON_21 Keylock KEY3_10 Scan MON_22 Lamp KEY3_11 Scan DEL/ADD MON_23 2-Tone Encode KEY3_16 Operator MON_27 Select Selectable Tone...
  • Page 13 Tuning MODE Disable PTM_DIS Fixed PRI_FIX_ Selected PRI_SEL_ *1. This function is not available on TK-272G. 20 Lock Back 0.5-5.0/0.05 LBA_500 Default:500ms Cannot be Time A set when Priority = none. 8-4. Memory Reset Mode 21 Lock Back 0.5-5.0/0.05 LBB_2000 Default:2000ms Cannot...
  • Page 14 TK-272G REALIGNMENT Flow Chart Function Setting Mode [Side1] [Side1] Group code Self programming mode Squelch level [Side1] [2]/[3] [2]/[3] [Side1] [Side1] [Side1] Auto reset time Priority Function set mode [2]/[3] [2]/[3] [Side1] [Side1] [Side1] Look back time A Call alert/Transpond...

  • Page 15: Disassembly For Repair

    TK-272G 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 1. Remove the three screws 2. Remove the two screws Lift the unit (X54), and rise up the connecter lever in the 3.

  • Page 16: Circuit Description

    TK-272G 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 17 TK-272G 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 18: Power Supply

    TK-272G 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 19 TK-272G 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 20: Semiconductor Data

    TK-272G 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 21 TK-272G 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...

  • Page 22: Description Of Components

    TK-272G DESCRIPTION OF COMPONENTS DISPLAY UNIT (X54-3250-10) 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...

  • Page 23: Parts List

    K29-5333-13 BUTTON KNOB (MONI/LAMP) TX-RX UNIT (X57-5870-XX) K29-5334-13 BUTTON KNOB (PTT) -11:TK-272G K -13:TK-272G K2 K29-5337-03 LEVER KNOB (BATT RELEASE) X57-5870-11 TX-RX UNIT B30-2019-05 LED(RED/GRE) K29-9043-02 KEY TOP CK73GB1H471K CHIP C 470PF K : TK-272G K K2 : TK-272G K2...
  • Page 24 CHIP C 1.0UF CC73GCH1H010B CHIP C 1.0PF C143,144 CK73GB1H102K CHIP C 1000PF C92-0565-05 CHIP-TAN 6.8UF 10WV C146,147 CK73GB1C104K CHIP C 0.10UF CK73GB1H103K CHIP C 0.010UF K C148 CK73GB1H103K CHIP C 0.010UF K K : TK-272G K K2 : TK-272G K2...
  • Page 25 CHIP C 0.10UF C230 CK73GB1H562J CHIP C 5600PF C324 CC73GCH1H090D CHIP C 9.0PF C231 C92-0521-05 CHIP-TAN 0.47UF 20WV C324 CC73GCH1H220J CHIP C 22PF C232 CK73GB1H471K CHIP C 470PF C326 CK73GB1H102K CHIP C 1000PF K : TK-272G K K2 : TK-272G K2...
  • Page 26 RK73GB1J472J CHIP R 4.7K 1/16W L77-1794-05 TCXO (16.8MHZ) RN73GH1J154D CHIP R 150K D 1/16W L78-0479-05 RESONATOR (3.58MHZ) RK73GB1J105J CHIP R 1.0M 1/16W L77-1810-05 CRYSTAL RESONATOR(9.8304MHZ) R56-58 RK73EB2ER39K CHIP R 0.39 K 1/4W K : TK-272G K K2 : TK-272G K2...
  • Page 27 CHIP R 100K 1/16W R184 RK73GB1J393J CHIP R 1/16W R124 RK73GB1J334J CHIP R 330K 1/16W R185 RK73GB1J102J CHIP R 1.0K 1/16W R126 RK73GB1J472J CHIP R 4.7K 1/16W R186 RK73GB1J155J CHIP R 1.5M 1/16W K : TK-272G K K2 : TK-272G K2...
  • Page 28 R305 R92-1252-05 CHIP R 0 OHM 2SC5108(Y) TRANSISTOR R306 RK73GB1J222J CHIP R 2.2K 1/16W 2SC4226(R24) TRANSISTOR R308 R92-0670-05 CHIP R 0 OHM Q3,4 2SC5108(Y) TRANSISTOR 2SC4988 TRANSISTOR R311 RK73GB1J221J CHIP R 1/16W K : TK-272G K K2 : TK-272G K2...
  • Page 29 3SK166A Q20,21 UMG3N TRANSISTOR 2SC4619 TRANSISTOR UMC4 TRANSISTOR Q24,25 DTC114EE DIGITAL TRANSISTOR DTA114EE DIGITAL TRANSISTOR UPA572T DTA114YE DIGITAL TRANSISTOR 2SK1588 2SC4619 TRANSISTOR 2SA1362(GR) TRANSISTOR Q33,34 DTC144EE DIGITAL TRANSISTOR UPA672T 2SK1824 Q301 2SK1215(E) K : TK-272G K K2 : TK-272G K2...

  • Page 30: Exploded View

    TK-272G EXPLODED VIEW 46 36 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 E M2.6x6 :N30-2606-46 F M2x3 :N39-2030-46 G M2x5 :N67-2005-46 2x4.5 :N78-2045-46 :N79-2030-46 :N82-2005-46 Parts with the exploded numbers larger than 700 are not supplied.

  • Page 31: Packing

    TK-272G PACKING 29.PACKING FIXTURE (H12-1487-02) 33.PROTECTION BAG (H25-0085-04) 7. INSTRUCTION MANUAL (B62-1388-00) 42.BELT HOOK (J29-0658-05) 6. WARRANTY CARD 34.PROTECTION BAG (B46-0470-00) (H25-2012-04) 3. CAP (SP/MIC) (B09-0351-03) 32.PROTECTION COVER 39.SP/MIC HOLDER (H21-0769-04) (J21-4493-04) K. SCREW SET (N99-2012-05) 29.PACKING FIXTURE (H12-1487-02) 50.BATTERY ASSY (W09-0940-15) 35.ITEM CARTON CASE...

  • Page 32: Adjustment

    TK-272G ADJUSTMENT Test Equipment Required for Alignment Test Equipment Major Specifications Standard Signal Generator Frequency Range 150 to 174MHz (K) 136 to 150MHz (K2). (SSG) Modulation Frequency modulation and external modulation. Output -127dBm/0.1 V to greater than -47dBm/1mV Power Meter Input Impedance 50 .

  • Page 33: Test Mode

    1. Antenna connector adapter The antenna connector of this radio uses an SMA terminal. This cable is used for connecting the TK-272G display unit Use an antenna connector adapter [SMA(f) – BNC(f) or and TX/RX unit when you test or repair the transceiver.
  • Page 34 TK-272G 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 35 TK-272G 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’)
  • Page 36 TK-272G ADJUSTMENT 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. However, if it is necessary to press these switches, be sure to press them at 90˚ angles, pressing them at other angles can easily damage the parts.
  • Page 37 TK-272G 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...
  • Page 38 TK-272G ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method 13.QT Deviation 1) Adj item [FQT] Power meter Encoder Wide:0.90kHz 40Hz Adjust Adjust [ Dev meter SP/MIC connector knob Narrow:0.42kHz 40Hz LPF:3kHz Oscilloscope HPF:OFF [Wide] 2) Adj item...
  • Page 39 TK-272G ADJUSTMENT Measurement Adjustment Specifications/ Item Condition Remark Test equipment Terminal Parts Method 1. Sensitivity Adj item [SENS] Encoder knob : ([S E N S]) : [88] (K) [60] (K2) Adjustment Adjust [ : (S S) : [134] (K) [100] (K2)
  • Page 40 TK-272G 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 (0.3 V) (MOD:1kHz / 3kHz) Narrow:-115dBm (0.4 V) (MOD:1kHz / 1.5kHz)

  • Page 41: Pc Board Views

    TK-272G 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...

  • Page 42: Tx-Rx Unit (X57-587X-Xx)

    TK-272G PC BOARD VIEW TX RX UNIT (X57-587X-XX) Component Side View 0-11:TK272G K, 0-13:TK-272G K2 TX-RX UNIT (X57-587X-XX) R218 Component Side View C194 R118 R164 C184 R259 C209 R255 R123 R122 C261 C207 R170 C216 R147 C223 C215 C203 R159...
  • Page 43 TK-272G PC BOARD VIEW TX RX UNIT (X57-587X-XX) Foil Side View 0-11:TK272G K, 0-13:TK-272G K2 TX-RX UNIT (X57-587X-XX) Foil Side View C241 C146 R108 R320 MIC1 R258 C126 C131 C108 C107 C139 R248 C115 R247 C124 C324 C130 R314 C136...
  • Page 44 TK-272G PC BOARD VIEW TX-RX UNIT (X57-587X-XX) Component Side + Foil Side View TX RX UNIT (X57-587X-XX) Component Side + Foil Side View 0-11:TK272G K, 0-13:TK-272G K2 R218 C241 C194 C146 R118 R108 R320 R164 C184 R259 MIC1 C209 R255...

  • Page 45: Schematic Diagram

    TK-272G SCHEMATIC DIAGRAM • Note) Component marked with a dot ( ) are Parts of pattern 1.

  • Page 46: Block Diagram

    TK-272G TK-272G TK-272G TK-272G BLOCK DIAGRAM 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:...

  • Page 47: Options

    TK-272G 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...

  • Page 48: 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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