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Kenwood TK-3701D Service Manual
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Kenwood TK-3701D Service Manual

Kenwood TK-3701D Service Manual

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SERVICE MANUAL
UHF TRANSCEIVER
RA079<Rev.001>
2019
12
SERVICE MANUAL
B5B-7322-00
TK-3701D
COPYRIGHT © 2019 JVCKENWOOD Corporation
This product complies with the RoHS directive for the European market.
This product uses Lead Free solder.
B5B-7322-00
No.RA079<Rev.001>
COPYRIGHT © 2019 JVCKENWOOD Corporation
2019/12

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  • Page 1 SERVICE MANUAL UHF TRANSCEIVER RA079<Rev.001> 2019 SERVICE MANUAL B5B-7322-00 TK-3701D COPYRIGHT © 2019 JVCKENWOOD Corporation This product complies with the RoHS directive for the European market. This product uses Lead Free solder. B5B-7322-00 No.RA079<Rev.001> COPYRIGHT © 2019 JVCKENWOOD Corporation 2019/12...

  • Page 2: Table Of Contents

    JVCKENWOOD Corporation reserves the right to make changes to any products herein at any time for improvement purposes. Firmware Copyrights The title to and ownership of copyrights for firmware embedded in KENWOOD product memories are reserved for JVCKENWOOD Corporation. Any modifying, reverse engineering, copy, reproducing or disclosing on an Internet website of the firmware is strictly prohibited without prior written consent of JVCKENWOOD Corporation.

  • Page 3: Precaution

    SPECIFICATION GENERAL Frequency Range 446.0 ~ 446.2 MHz Max. Channels per Radio 48 channels Number of Zones 3 zones Max. Channels per Zone 16 channels Channel Spacing Analog 12.5 kHz Digital 6.25 kHz Power Supply 7.5V DC ±20 % Battery Life (5-5-90) with KNB-69L 24 hours (Battery Saver On), 19 hours (Battery Saver Off) with KNB-45L...

  • Page 4: Specific Service Instructions

    When using the KPG-22U, install the supplied CD (with driver software) in the PC. The KPG-22U driver runs under Windows 7, 8.1, 10. The latest version of the USB driver is available for download from the following URL: https://www.kenwood.com/usb-com/ (This URL may change without notice.) 1-4 (No.RA079<Rev.001>)
  • Page 5 2.1.3.4 Programming software KPG-202D description • If the Disable Reading Key Data is enabled through The FPU is the programming software for the transceiver the FPU. supplied on a CD. d) Source transceiver and Target transceiver must have This software runs under Windows 7, 8.1, 10. same model name data if they using the Clone The data can be input to or read from the transceiver and edited function.

  • Page 6: Circuit Description

    CIRCUIT DESCRIPTION 2.2.1 Overview The TK-3701D is a PMR/dPMR Portable transceiver designed to operate in the frequency range of 446 to 446.2MHz. The unit consists of a transceiver IC, a transmitter, a digital control unit, and a power supply circuit.
  • Page 7 2.2.4 Transmitter System 2.2.4.1 Audio Band Circuit The signal from microphone is amplified through a microphone amplifier IC602 (including AGC function) and input into MPU/DSP (IC501) for audio processing. Voice signals of 300Hz or lower and frequencies of 3kHz or higher are cut off and an audio range 300Hz to 3kHz is extracted.
  • Page 8 2.2.5.3 PLL (IC2) compares the difference in phases of the VCO oscillation signal and the TCXO (X1) reference frequency. And it returns the difference voltage to the VCO CP terminal and realizes the "Phase Locked Loop". This allows the VCO oscillation frequency to accurately match (lock) the desired frequency.
  • Page 9 2.2.7 Power Supply Circuit The battery voltage (+B) is provided from battery terminal. The battery voltage passes through the 3.15A fuse (F400), and goes to RF Drive and final amplifier, DC/DC converter (IC407), AF amplifier (IC300 through the 1.0A fuse (F300)), and INT DET IC (IC406). IC406 monitors battery voltage.

  • Page 10: Components Description

    COMPONENTS DESCRIPTION Ref. No. Part Name Use / Function 2.3.1 TX-RX Unit (XC1-296K-01) Q108 DC switch (APC) [DC SW] Ref. No. Part Name Use / Function Q200 TRANSISTOR RF amplifier [RF AMP] Voltage regulator (32MS) Q202 DC switch (32R) [DC SW] [3.2V AVR] Q300 TRANSISTOR DC switch (RED LED) [DC SW]...

  • Page 11: Terminal Function

    TERMINAL FUNCTION Name I/O Function 2.4.1 TX-RX unit (XC1-296K-01) O Power output after passing through the fuse Name I/O Function O DC 3.2V output CN300 I Selector input I Volume level input I Selector input - GND - GND I Switched B input I Selector input I Switched B input I Selector input...

  • Page 12: Disassembly

    SECTION 3 DISASSEMBLY Precautions for Disassembly (6) Remove Speaker Holder Assy from Chassis. Press on the hooking portion of Speaker Holder and 3.1.1 Removing the TX-RX unit and other parts remove the Speaker Holder Assy from Chassis. (1) Loosen CAP screw and remove the CAP.<1> Note: (2) Remove Volume Knob &...
  • Page 13 (7) Remove PCB screws (x8). (11) Remove Rubber Seal & Holder Assy, Packing from (8) Desolder the ANT element and Positive Terminal. Chassis. Desolder ANT element Packing Desolder Rubber Seal Holder Positive terminal Assy (9) Unlock the FPC connector and remove FPC cable from it, then remove the PCB from Chassis.

  • Page 14: Precautions For Reassembly

    Precautions for Reassembly (4) Attaching the Battery Release Lever to the Front Case • Insert one side of the shaft into the hole at the lever fitting (1) Attach Rubber Sheet & Cushion to the chassis. section on the Front Case.<1> Note: Cushion The thin spring should be positioned above the two...

  • Page 15: Assembly Information (Sheet/Cushion)

    (5) Assembling the Battery Release Lever (6) Attaching the Positive Terminal to the Chassis • Place the lever <2> onto the stopper <1>. Always attach the positive terminal to the chassis, using • Place the thick spring <3> onto the lever. the following procedures, before attaching the TX-RX unit •...

  • Page 16: Adjustment

    SECTION 4 ADJUSTMENT E, T TYPE 4.1.1 Test Equipment Required for Alignment Test Equipment Major Specifications 1. Standard Signal Frequency Range 100 to 520MHz Generator (SSG) Modulation Frequency modulation and external modulation Output -127dBm/0.1μV to greater than -47dBm/1mV 2. Power Meter Input Impedance 50ohm Operation Frequency...

  • Page 17: Frequency And Signaling

    Battery Jig (W05-1011-00) Connect the power cable properly between the battery jig installed in the transceiver and the power supply, and be sure + Terminal (Red) output voltage and the power supply polarity prior to switching the power supply ON, otherwise over voltage and reverse - Terminal (Black) connection may damage the transceiver, or both.

  • Page 18: Pc Tuning Mode

    PC Tuning mode 4.3.3 Adjustment item supplement 4.3.1 Preparations for Tuning the Transceiver Adjustment Item Description Before attempting to tune the transceiver, connect the unit to a Assist Voltage The lock voltage of VCO is adjusted. This suitable power supply. item must be adjusted before all Whenever the transmitter is tuned, the unit must be connected to adjustment items.

  • Page 19: Common Section

    4.3.4 Adjustment item Order Adjustment item An (Analog Narrow) dv (dPMR446 Very Narrow) Adjust item Number Adjustment range Assist Voltage Common Section 2 1 ~ 256 DC Offset Automatic ADJ Common Section 3 1 ~ 4096 Frequency Common Section 4 1 ~ 256 Transmit Power Transmitter...
  • Page 20 Radio check Section Item Condition Measurement Adjustment Specifications/Remarks PC test mode Point Method 1. Frequency 1) Test Channel: 1 f. counter Check 446.106027~ check Test Signaling -ANT 446.106473MHz Mode: Analog, Signaling: 1 (±0.5ppm@ 2) PTT: Press [Transmit] 446.106250MHz) button. 2. Transmit 1) Test Channel: 1 Power meter Check...
  • Page 21 Transmitter Section Item Condition Measurement Adjustment Specifications/Remarks PC tuning mode Point Method 1. Transmit power 1) Adj item: [Transmit Power] Power meter 0.85W ±0.25W (Battery voltage: 2) Adj point: 1 point -ANT [<],[>] 1.2A or less 7.5V) 3) Press [Transmit] button. Power supply Ammeter Press [OK] button to store...
  • Page 22 Item Condition Measurement Adjustment Specifications/Remarks PC tuning mode Point Method 8. Battery 1) Adj item: Adjust the voltage to Press [OK] button to store Warning Level [Battery Warning Level] -Battery JIG 6.20V at the Battery the adjustment value. writing 2) Press [Transmit] button. Power meter JIG.

  • Page 23: Receiver Section

    Receiver Section Item Condition Measurement Adjustment Specifications/ Remarks PC tuning mode Point Method 1. AF level <PC test mode> Volume Turn the Volume 0.63V±0.1V setting 1) Test Channel: 1 -ANT knob to obtain Test Signaling AF VM 0.63V AF output. Mode: Analog, Signaling: 1 8ohm Dummy load Compander: Uncheck...

  • Page 24: Troubleshooting

    SECTION 5 TROUBLESHOOTING Failure diagnosis of the VCO section 5.1.1 Overview The VCO circuit is mounted inside a BLS. BLS stands for "Board Level Shield". This BLS has no lid and provides high shielding performance. Because BLS is not removable from circuit board by hand solder, the components inside the BLS is unable to solder.
  • Page 25 5.1.5 Check point and Test point in the PCB D300 R304 R305 C309 C103 R210 R147 R211 R127 R101 R126 C314 C322 Q304 R400 C224 C105 C317 C319 R300 R303 C315 C301 F300 C329 IC301 IC302 C332 C226 C327 C326 C305 CP300 D307...
  • Page 26 5.1.6 Inspection Procedure Assist Auto tune ●Check VCO output level - Remove R9. - Solder the following capacitor on the - Remove L21 and C42 - There is problem with circuit No Signal Short Circuit ($C89). position - Check whether TL2 is inside BLS.

  • Page 27: Operating Method Of Enforced Firmware Overwriting Mode

    Operating Method of Enforced Firmware Overwriting (5) Upon startup of FLDM loader, Red LED blinking. Mode (6) Start Updater for TK-3701D, select the COM port number and speed, and then click the "Write" button. Enforced firmware overwriting mode is a mode to forcibly...
  • Page 28 (4) If necessary, write the FPU data used by the customer. Note: • When a new printed circuit board is used, the KENWOOD ESN changes, as does the Transceiver Information display of the KPG-202D, but this does not have any effect on the operation of the transceiver.
  • Page 29 PRECAUTIONS ON SCHEMATIC DIAGRAMS * Due to the improvement in performance, some part numbers shown in the circuit diagrams may not agree with those indicated in the Parts List. * The parts numbers, values and rated voltage etc. in the Schematic Diagrams are for reference only.
  • Page 30 PRINTED CIRCUIT BOARD TX-RX UNIT (XC1-296K-01) --- Component side view/Side A (J7C-0290-00) --- C302 R301 C304 R302 XC1-296 C300 C318 J7C-0290-00 C316 Q103 C400 F400 R115 C104 C303 R111 Q202 C403 R142 D105 CN300 IC400 C406 TL201 CN401 R543 R402 Q400 R542 R315...
  • Page 31 TX-RX UNIT (XC1-296K-01) --- Foil side view/Side B (J7C-0290-00) --- S302 S303 C175 R152 C421 S301 S302 D402 C529 S303 IC100 C517 IC502 R415 L500 R503 R501 C525 C266 C409 L404 C511 R227 C508 C423 R522 C526 C174 S301 R225 R226 R526 R504...
  • Page 32 A-1C ADDRESS TABLE OF BOARD PARTS Side Y axis Each address may have an address error by one X axis interval. REF.NO. LOCATION REF.NO. LOCATION REF.NO. LOCATION REF.NO. LOCATION REF.NO. LOCATION REF.NO. LOCATION REF.NO. LOCATION REF.NO. LOCATION REF.NO. LOCATION REF.NO. LOCATION REF.NO. LOCATION REF.NO. LOCATION B- 2A B- 2A R230...
  • Page 33 BLOCK DIAGRAM TX-RX UNIT TX-RX UNIT (XC1-296) IC400 TX/RX VCO TX/RX 5.0V AVR 50M (5.0V) Q400 TK-3701D-E 892.00-892.40MHz 446.00-446.20MHz TK-3701D-T 50T (5.0V) TX/RX PLL_DATA PLL_CLK IC402 PLL_LE 5.0V AVR 50V (5.0V) PLL_LD PLL IC D5,6 D101,102 D7,8 IC401 X1 16.8MHz...
  • Page 34 LEVEL DIAGRAM TX-RX UNIT ■ Receiver Section RF (446.093750MHz) AF (1kHz) -108.5dBm -120.5dBm -120.0dBm -119.5dBm -121.0dBm -118.5dBm 40mVrms 1.95Vp-p C224 D101 IC302 D102 D103 Internal Speaker C168 C209 Q200 C216 IC501 C633 D104 C201 IC200 IC603 AF AMP Transceiver IC MPU/DSP 2.15Vp-p IC300...
  • Page 35 SCHEMATIC DIAGRAM TX-RX UNIT (XC1-296K-01) 0.01u 100p 24 23 22 21 20 19 0.01u 100p 100p PVDD CPVDD PLL IC TEST4 RFINP 100p FINAL AMP RFINN RK74HA1J101J TEST1 0.22u AK1543 VREF2 VCO BUFFER Q107 L114 C164 D101 C168 DVSS RD07MUS2BT514 16.8MHz DATA DRIVE AMP...
  • Page 36 < MEMO > (No.RA079<Rev.001>) 2-8...
  • Page 37 PARTS LIST [TK-3701D] * SAFETY PRECAUTION Parts identified by the symbol are critical for safety. Replace only with specified part numbers. * BEWARE OF BOGUS PARTS Parts that do not meet specifications may cause trouble in regard to safety and performance.
  • Page 38 Exploded view of general assembly and parts list Block No.M1MM TX-RX UNIT<01> 3-2(No.RA079<Rev.001>)
  • Page 39 General assembly Block No. [M][1][M][M]  Symbol No. Part No. Part Name Description Local A0C-0248-02 P.CABINET ASSY A1A-0131-00 CHASSIS B1B-0174-00 ILL.GUIDE B4D-0065-00 KENWOOD BADGE B4D-0075-00 BADGE PROTALK D1A-0071-00 LEVER D2B-0066-00 SHAFT D32-0441-13 STOPPER E23-1253-24 TERMINAL E23-1395-04 TERMINAL G10-1348-04 FIBROUS SHEET...
  • Page 40 Electrical parts list TX-RX UNIT  Symbol No. Part No. Part Name Description Local XC1-296K-01 Q305 LTC014EEBFS8 DIGI TRANSISTOR Note 1:If changing this IC, please contact our Q306 LTC014EEBFS8 DIGI TRANSISTOR service center. Q307 2SB1694 TRANSISTOR Q308 SSM6N15AFEM DUAL FET Note 2:This part cannot be replaced.
  • Page 41  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local CK73JXR1C104K C CAPACITOR 0.1uF 16V K C106 CK730DX1C103K C CAPACITOR 0.01uF 16V K CK73JXR1A473K C CAPACITOR 0.047uF 10V K C108 CK73JXR1H271K C CAPACITOR 270pF 50V K CK73JXR1H271K C CAPACITOR 270pF 50V K...
  • Page 42  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local C207 CC730CC1H180G C CAPACITOR 18pF 50V G C317 CK73JXR1H471K C CAPACITOR 470pF 50V K C208 CC730CC1H020B C CAPACITOR 2pF 50V B C318 CK73JXR1H471K C CAPACITOR 470pF 50V K C209...
  • Page 43  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local C514 CK73HB0J475M C CAPACITOR 4.7uF 6.3V M C645 CK73JXR1C104K C CAPACITOR 0.1uF 16V K C515 CK73JXR1H471K C CAPACITOR 470pF 50V K C646 CK73HB1A105K C CAPACITOR 1uF 10V K...
  • Page 44  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local R100 RK73HH1J472D MG RESISTOR 4.7kΩ 1/16W D R230 RK73HB1J100J MG RESISTOR 10Ω 1/16W J R101 RK73HH1J472D MG RESISTOR 4.7kΩ 1/16W D R231 RK73HH1J683D MG RESISTOR 68kΩ...
  • Page 45  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local R416 RK73HH1J103D MG RESISTOR 10kΩ 1/16W D R623 RK73HB1J100J MG RESISTOR 10Ω 1/16W J R417 RK73HH1J333D MG RESISTOR 33kΩ 1/16W D R624 RK73HB1J104J MG RESISTOR 100kΩ...
  • Page 46  Symbol No. Part No. Part Name Description Local L200 L41-1575-53 CHIP INDUCTOR L201 L41-8268-14 CHIP INDUCTOR L202 L41-8268-14 CHIP INDUCTOR L204 LR79G0CQ6N8C CHIP INDUCTOR L205 L41-8268-14 CHIP INDUCTOR L206 L41-8268-14 CHIP INDUCTOR L208 LB73H0AV-002 CHIP FERRITE L210 LK73H0AM27NJ M.CHIP INDUCTOR 27nH L211 LB73H0AV-001 CHIP FERRITE...
  • Page 47 Packing materials and accessories parts list Block No.M2MM Packing and accessories Block No. [M][2][M][M]  Symbol No. Part No. Part Name Description Local B5A-3228-00 INST.MANUAL B0K-0116-00 B0K-0117-00 CAP ASSY 2PIN --------- PACKING FIXTURE --------- PROTECTION BAG RADIO --------- PROTECTION BAG H5A-1915-00 ITEM CARTON J1K-0817-00...
  • Page 48 JVCKENWOOD Corporation Communications Systems Division (No.RA079<Rev.001>) Printed in Japan...

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