Kenwood TK-P721 Service Manual
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Kenwood TK-P721 Service Manual

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VHF FM TRANSCEIVER
TK-P721
SERVICE MANUAL
Helical antenna
(KRA-26:Option)
Button knob (PTT)
(K29-9425-03)
Button knob
(SIDE1/SIDE2)
(K29-9426-03)
Key top (16key)
(K29-9492-12)
Plastic cabinet assy
(A02-4166-03)
This product complies with the RoHS directive for the European market.
Knob (Selector)
(K29-9427-03)
Knob (Volume)
(K29-9309-13)
© 2012-3 PRINTED IN JA PAN
B53-7011-10 ( Y ) PDF
CONTENTS
GENERAL ....................................................2
SYSTEM SET-UP .........................................3
REALIGNMENT ...........................................3
DISASSEMBLY FOR REPAIR .....................9
CIRCUIT DESCRIPTION ...........................12
SEMICONDUCTOR DATA .........................17
COMPONENTS DESCRIPTION ................18
PARTS LIST ...............................................19
EXPLODED VIEW ......................................27
PACKING ...................................................28
ADJUSTMENT ...........................................29
TX-RX UNIT (X57-7880-22) ....................34
SCHEMATIC DIAGRAM ............................38
BLOCK DIAGRAM .....................................44
LEVEL DIAGRAM ......................................46
SPECIFICATIONS ......................................47
This product uses Lead Free solder.

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  • Page 1: Table Of Contents

    VHF FM TRANSCEIVER TK-P721 SERVICE MANUAL © 2012-3 PRINTED IN JA PAN B53-7011-10 ( Y ) PDF CONTENTS GENERAL ............2 Helical antenna (KRA-26:Option) SYSTEM SET-UP .........3 Knob (Selector) REALIGNMENT ...........3 (K29-9427-03) Knob (Volume) DISASSEMBLY FOR REPAIR .....9 (K29-9309-13) CIRCUIT DESCRIPTION ......12 SEMICONDUCTOR DATA ......17...

  • Page 2: General

    Copyright 2012 by JVC KENWOOD Corporation. All While every precaution has been taken in the preparation rights reserved. of this manual, JVC KENWOOD Corporation assumes no No part of this manual may be reproduced, translated, responsibility for errors or omissions. Neither is any liability...

  • Page 3: System Set-Up

    TK-P721 SYSTEM SET-UP Merchandise received Frequency range (MHz) RF power Type Choose the type of transceiver TX/RX 136~174 5.0W TK-P721 A personal computer, programming interface (KPG-22A/22U), Transceiver programming and FPU (programming software) are required for programming. (The frequency, TX power HI/LOW, and signaling data are programmed for the transceiver.)
  • Page 4 TK-P721 REALIGNMENT 3-6. Programming with PC 3. PC Mode If data is transferred to the transceiver from a PC with the 3-1. Preface FPU, the data for each set can be modifi ed. The transceiver is programmed by using a personal com-...
  • Page 5 TK-P721 REALIGNMENT • Electronic interface may cause a failure in data transfer 4. Wireless Clone Mode during Wireless Clone, such as when waveforms or elec- 4-1. Outline tromagnetics are being performed at the workbench. “Wireless Clone Mode” copies the transceiver data to an- •...
  • Page 6 TK-P721 REALIGNMENT Key operation 5. Self Programming Mode Key Function Write mode for frequency data and signaling, etc. To be used ONLY by the authorized service person maintaining the Toggle between Zone selection and Channel selec- [Selector] tion user's equipment. After programming, reset the FPU to the “Self- Programming”...
  • Page 7 TK-P721 REALIGNMENT 5-6. Self Programming Mode fl ow chart 5-5. Item Setting Mode ■ Channel selection mode fl ow chart In this mode, the selected item in the Item Selection mode can be programmed. When the [S] key is pressed in the Item Selection mode,...
  • Page 8 TK-P721 REALIGNMENT ■ Item setting mode fl ow chart 6. Firmware Version Information Mode Display Turn the transceiver ON with the [Side1] and [Side2] keys Current 136. 00000 held down. Then, the version is displayed during holding the setting value [1.

  • Page 9: Disassembly For Repair

    TK-P721 DISASSEMBLY FOR REPAIR 1. Removing the Case Assembly from the 3. Removing the TX-RX unit from the Chassis Chassis 1. Remove the eleven screws f fi xing the TX-RX unit. 1. Remove the selector knob a and volume knob b .
  • Page 10 TK-P721 DISASSEMBLY FOR REPAIR 5. Attaching the Battery Release Lever to 6. Assembling the Battery Release Lever 1. Place the lever b onto the stopper a . the Case Assembly 2. Place the thick spring c onto the lever. 1. Insert one side of the shaft into the hole at the lever fi tting 3.
  • Page 11 TK-P721 DISASSEMBLY FOR REPAIR 8. Mounting the Chassis to the Case 10. The Nuts of the Volume Knob and Assembly Channel Knob 1. Confirm that the waterproof packing attached to the Note that the shapes, colors and heights of nuts of the...

  • Page 12: Circuit Description

    TK-P721 CIRCUIT DESCRIPTION 1. Frequency Confi guration The receiver utilizes double conversion. The first IF is 49.95MHz and the second IF is 450kHz. The fi rst Local os- cillator is supplied from the PLL circuit. The PLL circuit in the transmitter generates the neces- sary frequencies.
  • Page 13 TK-P721 CIRCUIT DESCRIPTION 2-3. IF Amplifi er Circuit 2-5. Audio Amplifi er Circuit The fi rst IF signal is passed through a four-pole mono- The demodulated signal from IC401 is sent to an AF am- lithic crystal fi lter (XF401) to remove the adjacent channel plifi...
  • Page 14 TK-P721 CIRCUIT DESCRIPTION 3-2. Drive and Final Amplifi er Circuit 3-3. APC Circuit The signal from the T/R switch (D18 is on) is amplifi ed by The APC circuit always monitors the current flowing the RF AMP (Q201) and pre-drive amplifi er (Q203) to 50mW.
  • Page 15 TK-P721 CIRCUIT DESCRIPTION 5-2. Memory Circuit The Memory circuit consists of the MCU (IC820) and TX/RX BUFF BUFF EEPROM (IC810). The EEPROM has a capacity of 512k bits (TX: High) RF AMP and stores the channel information, the last channel data, the scan on status, and other parameters.
  • Page 16 TK-P721 CIRCUIT DESCRIPTION ■ High-speed data (2-tone/5-tone) 5-4. Key Input Keys and channel selector circuit. High-speed data (HSD) is output from pin 3 of the MCU. The signal from the keys and channel selector are direct- HSD deviation made by an adjustment in the MCU is passed through the low pass CR fi...

  • Page 17: Semiconductor Data

    TK-P721 SEMICONDUCTOR DATA MCU: F363BEDFEKDLE (TX-RX unit IC820) Pin No. Signal Name Function CM_DTI Baseband IC data input Pin No. Signal Name Function CM_CNS Baseband IC chip select output BSHIFT CPU clock frequency shift DC_SW APC voltage discharge switch LSDO...

  • Page 18: Components Description

    TK-P721 COMPONENTS DESCRIPTION TX-RX unit (X57-7880-22) Ref. No. Use / Function Operation / Condition Q804 DC switching 33MS from 33M Ref. No. Use / Function Operation / Condition Q805 DC switching Green/Red LED PLL IC TX/RX 1st local OP amplifi er CVIN/CVADJ amplifi...

  • Page 19: Parts List

    TK-P721 PARTS LIST 2 2 0 CC45 Color* 010 = 1pF 0 = 22pF 1 = Type ... ceramic, electrolytic, etc. 4 = Voltage rating 100 = 10pF 2 = Shape ... round, square, etc. 5 = Value 101 = 100pF Multiplier 3 = Temp.
  • Page 20 TK-P721 PARTS LIST ✽ New Parts. indicates safety critical components. L : Scandinavia L : Scandinavia K : USA K : USA P : Canada P : Canada Parts without Parts No. are not supplied. Y : PX (Far East, Hawaii)
  • Page 21 TK-P721 PARTS LIST TX-RX UNIT (X57-7880-22) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation CC73HCH1H0R3B CHIP C 0.3PF C265 CC73HCH1H330J CHIP C 33PF CC73HCH1H130G CHIP C 13PF C271 CC73GCH1H030B CHIP C 3.0PF...
  • Page 22 TK-P721 PARTS LIST TX-RX UNIT (X57-7880-22) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts parts nation nation C469 CC73HCH1H050B CHIP C 5.0PF C883 CK73HB1H152K CHIP C 1500PF C470 CK73HB1H102K CHIP C...
  • Page 23 TK-P721 PARTS LIST TX-RX UNIT (X57-7880-22) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation L40-1502-86 SMALL FIXED INDUCTOR(15UH) CP840-844 RK75HA1J103J CHIP-COM 10K J 1/16W L40-3391-86 SMALL FIXED INDUCTOR(3.3UH)
  • Page 24 TK-P721 PARTS LIST TX-RX UNIT (X57-7880-22) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts parts nation nation R212 RK73HB1J681J CHIP R 1/16W R436 RK73HB1J101J CHIP R 1/16W R213 RK73HB1J122J CHIP R 1.2K...
  • Page 25 TK-P721 PARTS LIST TX-RX UNIT (X57-7880-22) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation R865 RK73HB1J223J CHIP R 1/16W R960,961 RK73HB1J000J CHIP R 1/16W R867,868 RK73HB1J103J CHIP R...
  • Page 26 TK-P721 PARTS LIST TX-RX UNIT (X57-7880-22) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts parts nation nation IC817 TC75S51FE(F) MOS-IC IC820 F363BEDFEKDLE ✽ IC821 NJU6434 MOS-IC 2SC5636 TRANSISTOR KTC4075E(Y,GR) TRANSISTOR Q4 ,5...

  • Page 27: Exploded View

    TK-P721 EXPLODED VIEW TX-RX unit A : N14-0848-05 B : N14-0849-05 C : N30-2604-48 D : N30-2606-48 E : N83-2005-48 Parts with the exploded numbers larger than 700 are not supplied.

  • Page 28: Packing

    TK-P721 PACKING 6 Instruction manual (B62-2445-10) 704 Protection bag 50 Belt clip (KBH-10) 48 Holder (SP/MIC) 60 Screw set 3 Cap 706 Packing fixture 707 Item carton case Parts with the exploded numbers larger than 700 are not supplied.

  • Page 29: Adjustment

    TK-P721 ADJUSTMENT Test Equipment Required for Alignment Major Specifi cations Test Equipment Frequency Range 136 to 174MHz Standard Signal Generator (SSG) Modulation Frequency modulation and external modulation Output –127dBm/0.1µV to greater than –47dBm/1mV Input Impedance 50 RF Power Meter Operation Frequency...
  • Page 30 TK-P721 ADJUSTMENT Frequency and Signaling Preparations for Tuning the Transceiver The transceiver has been adjusted for the frequencies Before attempting to tune the transceiver, connect the shown in the following table. When required, re-adjust them unit to a suitable power supply.
  • Page 31 TK-P721 ADJUSTMENT Common Section Measurement Adjustment Specifi cations / Remarks Item Condition Test- Unit Terminal Unit Parts Method equipment 1. Setting 1) BATT terminal votage: 7.5V 2) SSG standard modulation [Wide] MOD: 1kHz, DEV: 3kHz [Narrow] MOD: 1kHz, DEV: 1.5kHz 2.
  • Page 32 TK-P721 ADJUSTMENT Measurement Adjustment Specifi cations / Remarks Item Condition Test- Unit Terminal Unit Parts Method equipment 6. DQT 1) TEST CH: 1 Power 0.75kHz ±40Hz Deviation meter fi lter Deviation meter [Wide] LPF: 3kHz Deviation HPF: OFF meter PTT: ON Oscilloscope 7.
  • Page 33 TK-P721 ADJUSTMENT Measurement Adjustment Specifi cations / Remarks Item Condition Test- Unit Terminal Unit Parts Method equipment 2. Open 1) TEST CH: Center, High, Low Press [Start] Squelch (3 points) (Auto tuning) [Wide] SSG otuput: –120dBm Oscilloscope (0.22µV) SSG MOD: 3.0kHz...

  • Page 34: Pc Board

    TK-P721 PC BOARD TX-RX UNIT (X57-7880-22) Component side view (J79-0287-39) J79-0287-39 D819 C496 R469 R470 COM1 BPF1 COM2 COM3 COM4 SEG1 C811 SEG2 SEG3 SEG4 SEG5 R956 SEG6 D831 SEG7 R707 BATT SEG8 R703 SEG9 D830 SEG10 SEG11 BPF2 R701...
  • Page 35 TK-P721 PC BOARD TX-RX UNIT (X57-7880-22) Component side view (J79-0287-39) C819 R955 R312 C307 R306 R311 D819 C945 D824 D818 L302 Q304 IC301 Q305 CP836 C311 R318 IC810 R308 Q822 R235 C831 CP837 CN801 C861 C849 R852 C843 R839 R845...
  • Page 36 TK-P721 PC BOARD TX-RX UNIT (X57-7880-22) Foil side view (J79-0287-39) SIDE2 SIDE1 C256 C818 R305 D301 Q301 L221 R456 C474 C495 L418 Q407 C302 C469 C250 R458 D408 R462 C486 R213 C462 R209 L217 C484 C482 R463 C209 L420 C205...
  • Page 37 TK-P721 PC BOARD TX-RX UNIT (X57-7880-22) Foil side view (J79-0287-39) J79-0287-39 SIDE2 R406 C406 C403 L410 L408 C402 D803 C455 C452 R409 R408 C447 C444 R471 R450 D402 R445 R440 C456 C464 R443 CF402 C463 C450 Q401 R444 C414 C466...

  • Page 38: Schematic Diagram

    TK-P721 SCHEMATIC DIAGRAM TX-RX UNIT (X57-7880-22) S I G N BUSY B30-2314-05 B30-2315-05 B30-1790-05 D 8 0 1 D 8 0 4 D 8 0 5 D C S W BLUE LED 2 S K 1 8 24A D C S W ON:3.3V...
  • Page 39 TK-P721 SCHEMATIC DIAGRAM TX-RX UNIT (X57-7880-22) TH_DET THDET THDET AFCONT AFCONT CVIN CVIN BATT 3.3V 3.3V E E P RO M I C 8 1 0 M 9 5 5 1 2 - R DW 6 T P CM_CSN CM_DTI...
  • Page 40 TK-P721 SCHEMATIC DIAGRAM TX-RX UNIT (X57-7880-22) THDET THDET AFCONT CVIN BATT C P 1 100x4 5.0V 5.0V R 1 6 PL_STB PL_DAT LOIN PL_CLK PL_UL CVIN D C AMP I C 2 T C X O 3.3V 7 LD B D 7 5 4 2 F V M...
  • Page 41 TK-P721 SCHEMATIC DIAGRAM TX-RX UNIT (X57-7880-22) THDET R 6 0 3.7V 1 5 n C 2 0 C 2 9 C 3 4 R 6 2 LOIN 2.5V 1 5 p 4 7 0 p 4 7 0 p C 7 2...
  • Page 42 TK-P721 SCHEMATIC DIAGRAM TX-RX UNIT (X57-7880-22) THDET R 2 1 1 R 2 1 3 D R I V E R 2 0 3 R 2 0 6 R: 0V 1 . 2 k C 2 2 2 R D 0 1 M U S 1 - T 1 1 3 DRVOUT T:1.5V...
  • Page 43 TK-P721 SCHEMATIC DIAGRAM TX-RX UNIT (X57-7880-22) THDET F I N A L DRVOUT A N T S W R D 0 7 M U S 2 B T 1 1 2 A N T L 2 2 1 STRIP LINE...

  • Page 44: Block Diagram

    TK-P721 BLOCK DIAGRAM X57-788 B30-2337-05 D818-D821,D824-D828 2SC5636 RF BUFFER LCD BACK LIGHT PL_STB Q820 2SC4617(S) PL_DAT 33MS Q821 2SB1694 D817 MA2S111-F PL_CLK MCH3914(7)-H LCDBL LCD DRIVER SWIN D4,D6,D8,D9 1SV323F PL_UL AK1541 D16 HVC350B LCDAT LCLD RF B LCCLK MOD2 IC821...
  • Page 45 TK-P721 BLOCK DIAGRAM VHF: 136MHz~ 174MHz VHF: 185.95MHz~223.95MHz (RX) 136MHz~174MHz (TX) D17,D18 Q201 Q203 Q204 Q205 D201,D202 HVC131 2SC5636 2SC5636 HSC277 2SC5636 2SC5455-A RD01MUS1-T113 RD07MUS2BT112 D203,D204 RN142S RF BUFFER TX/RX RF AMP RF AMP PRE DRIVE DRIVE AMP FINAL AMP...

  • Page 46: Level Diagram

    TK-P721 LEVEL DIAGRAM...

  • Page 47: Specifications

    Modulation .............16K0F3E (Wide) / 11K0F3E (Narrow) FM Hum and Noise ..........45dB (Wide) / 40dB (Narrow) Modulation Distortion ..........Less than 5% Measurements made per TIA/EIA-603 and specifi cations shown are typical. Kenwood reserves the right to change specifi cations without prior notice or obligation.
  • Page 48 TK-P721...
  • Page 49 TK-P721 TK-P721 PC BOARD PC BOARD TX-RX UNIT (X57-7880-22) Component side view (J79-0287-39) TX-RX UNIT (X57-7880-22) Component side view (J79-0287-39) C819 J79-0287-39 R955 R312 C307 R306 R311 D819 C945 D824 D818 C496 L302 R469 Q304 IC301 R470 COM1 BPF1 Q305...
  • Page 50 TK-P721 TK-P721 PC BOARD PC BOARD TX-RX UNIT (X57-7880-22) Foil side view (J79-0287-39) TX-RX UNIT (X57-7880-22) Foil side view (J79-0287-39) J79-0287-39 SIDE2 SIDE1 R406 C406 C256 C818 R305 C403 D301 L410 L408 C402 D803 C455 C452 R409 R408 C447 C444...
  • Page 51 TX-RX UNIT (X57-7880-22) BUSY S I G N TH_DET THDET THDET THDET THDET THDET THDET B30-2314-05 THDET R 2 1 1 R 2 1 3 DRIVE B30-2315-05 AFCONT AFCONT AFCONT R 2 0 3 FINAL B30-1790-05 CVIN CVIN CVIN R 6 0 R 2 0 6 R: 0V 1 .
  • Page 52 X57-788 B30-2337-05 D818-D821,D824-D828 2SC5636 VHF: RF BUFFER 136MHz~ LCD BACK LIGHT 174MHz PL_STB Q820 2SC4617(S) PL_DAT VHF: 33MS 185.95MHz~223.95MHz (RX) Q821 2SB1694 136MHz~174MHz (TX) D817 MA2S111-F PL_CLK MCH3914(7)-H LCDBL LCD DRIVER SWIN D4,D6,D8,D9 1SV323F D17,D18 Q201 Q203 Q204 Q205 D201,D202 HVC131 PL_UL AK1541 D16 HVC350B...

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