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Kenwood TK-3401D Service Manual
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Kenwood TK-3401D Service Manual

Uhf digital transceiver
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B5B-7138-00
6 S ERVICE MANUAL
2014
RA012<Rev.001>
COPYRIGHT © 2014 JVC KENWOOD Corporation
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
This product complies with the RoHS directive for the European market.
B5B-7138-00
SERVICE MANUAL
UHF DIGITAL TRANSCEIVER
TK-3401D
Note :
Lead free solder used in the board (material : Sn, Ag, In, Bi, melting point : 227 Centigrade)
COPYRIGHT © 2014 JVC KENWOOD Corporation

TABLE OF CONTENTS

This product uses Lead Free solder.
No.RA012<Rev.001>
2014/6

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Summary of Contents for Kenwood TK-3401D

  • Page 1: Table Of Contents

    2014 6 S ERVICE MANUAL B5B-7138-00 TK-3401D COPYRIGHT © 2014 JVC KENWOOD Corporation Note : Lead free solder used in the board (material : Sn, Ag, In, Bi, melting point : 227 Centigrade) TABLE OF CONTENTS PRECAUTION............... . . 1-4 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 Neither is any liability assumed for damages resulting from the use of the information contained herein. JVC KENWOOD 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 JVC KENWOOD Corporation.
  • Page 3 FM Hum & Noise Analog 40dB Audio Distortion Less than 5% Modulation 8K50F3E, 4K00F1E Measurements made par EN standards or TIA/EIA 603 and specifications shown are typical. JVC KENWOOD Corporation reserves the right to change specifications without prior notice or obligation. (No.RA012<Rev.001>)1-3...

  • Page 4: Precaution

    SPECIFIC SERVICE INSTRUCTIONS SYSTEM SET-UP Merchandise received Frequency range (MHz) RF power Type TX/RX 446.00625~ TK-3401D E 0.5W Choose the type of transceiver 446.196875 TK-3401D T Transceiver programming A personal computer, programming interface (KPG-22A/22U), and FPU (programming software) are required for programming.
  • Page 5 The KPG-22U driver runs under Windows XP, Vista, 7, 8 or 8.1. The latest version of the USB driver is available for download from the following URL: http://www.kenwood.com/usb-com/ (This URL may change without notice.) 2.2.3.5 Programming software description The FPU is the programming software for the transceiver sup- plied on a CD-ROM.
  • Page 6 CIRCUIT DESCRIPTION 2.3.1 Frequency Configuration The receiver utilizes double conversion. The first IF is 49.95MHz and the second IF is 450kHz. The first Local oscillator is supplied from the PLL circuit. The PLL circuit in the transmitter generates the necessary frequencies. Figure 1 shows the frequencies. TX/RX: 446.00625~446.196875MHz 1st MIX Baseband...
  • Page 7 2.3.2.3 IF Amplifier Circuit The first IF signal is passed through a four-pole monolithic crystal filter (XF400) to remove the adjacent channel signal. The filtered first IF signal is amplified by the first IF amplifier (Q403) and is then applied to the IF system IC (IC400). The IF system IC provides a second mixer, AGC+BPF, PLL FM detector, noise squelch and RSSI circuit.
  • Page 8 2.3.3.3 APC Circuit The APC circuit always monitors the current flowing through the drive amplifier (Q206) and RF power amplifier (Q208), and keeps it constant. The voltage drop at R230, R231 and R233 is caused by the current flowing through the RF final amplifier. This voltage is applied to the differential amplifier IC200 (1/2).
  • Page 9 2.3.5 Control Circuit The control consists of the MCU (IC710) and its peripheral circuits. It controls the TX-RX unit. IC710 mainly performs the following; (1) Switching between transmission and reception via the PTT signal input. (2) Reading channel information, frequency, and program data from the memory circuit. (3) Sending frequency program data to the PLL.
  • Page 10 2.3.7 Power Supply There are five 5V power supplies and five 3.3V power supplies: 50M, 50V, 50C, 50R, 50T, 33M, 33MS, 33B, 33R and 33MD. 50M and 33M are always output while the power is on. 33MS is always output, but turns off when the power is turned off, to prevent a malfunction of the MCU. 50C is a common 5V and is output when SAVE is not set to ON.
  • Page 11 2.3.8.2 For Digital Voice Mode If the digital data matches in the MCU, the digital voice payload data will go into the Vocoder in the MCU for conversion to PCM. The PCM data will go to the baseband IC through the SPI input, where it will be converted to analog by the DAC. Analog voice will be filtered and finally sent to the audio amplifier.
  • Page 12 Name Function Name Function 39 OPTDET Option detection 84 EEP_CLK Clock for EEPROM 40 GRNLED Green LED control (Hi: LED ON) 85 EEP_WP Write protect for EEPROM 41 REDLED Red LED control (Hi: LED ON) 86 PLL_DATA Data output for PLL 42 MIC_MT MIC mute 87 PLL_LE...
  • Page 13 Ref. Part Name Description Ref. Part Name Description DC switch (Assist) Variable capacitance diode RX VCO tune Transistor PLL Fin amplifier Variable capacitance diode TX VCO tune Q1 control Diode Speed up Transistor Rippler filter Variable capacitance diode TX assist RX VCO Variable capacitance diode RX assist TX VCO...
  • Page 14 TERMINAL FUNCTION 2.6.1 TX-RX unit (XC1-0072-70) Pin No. Name Function CN600 VOLOUT Volume output to audio amplifier VOLIN Volume level input for audio control Power input after power switch Connect to pin 3 Power output after passing through the fuse Connect to pin 5 VOLGND GND for volume level...

  • Page 15: Disassembly

    SECTION 3 DISASSEMBLY Precautions for Disassembly Note: You can remove the TX-RX unit from the chassis without 3.1.1 Removing the Case Assembly from the Chassis removing the solder at the positive terminal. However, in (1) Remove the selector knob <1> and volume knob <2>. this case, you cannot attach the packing (G53-2218-03) (2) Remove the two screws <3>.
  • Page 16 Precautions for Reassembly 3.2.2 Assembling the Battery Release Lever (1) Place the lever <2> onto the stopper <1>. 3.2.1 Attaching the Battery Release Lever to the Case As- (2) Place the thick spring <3> onto the lever. sembly (3) Hook the right and left ends of the thin spring <4> onto the (1) Insert one side of the shaft into the hole at the lever fitting tabs of the stopper, then place the thin spring onto the lever section on the case assembly <1>.
  • Page 17 3.2.4 Mounting the Chassis to the Case Assembly 3.2.5 The Nuts of the Volume Knob and Channel Knob (1) Confirm that the waterproof packing attached to the cir- Note that the shape, color and height of the nuts of the volume cumference of the chassis is securely inserted in the knob and channel knob are different from one another.

  • Page 18: Adjustment

    SECTION 4 ADJUSTMENT Test Equipment Required for Alignment Test Equipment Major Specifications 1. Standard Signal Generator Frequency Range 100 to 520MHz (SSG) Modulation Frequency modulation and external modulation Output -127dBm/0.1µV to greater than -47dBm/1mV 2. Power Meter Input Impedance 50Ω Operation Frequency 100 to 520MHz Measuring Range...
  • Page 19 ANT cable(E30-3418-05) Analog mode signaling Modify the cable as shown below. Receive Transmit None None None 100 Hz Square Wave QT 67.0 Hz QT 67.0 Hz QT 151.4 Hz QT 151.4 Hz QT 210.7 Hz QT 210.7 Hz QT 254.1 Hz QT 254.1 Hz Solder the ANT cable to the ANT terminal on the TX-RX unit.
  • Page 20 Common Section Item Condition Measurement Adjustment Specifications /Remarks Test- Unit Terminal Unit Parts Method equipment 1. Setting 1) Power supply voltage DC power supply terminal : 7.5V 2. Receive 1) Auto tuning 2.3 ± 0.1V Assist voltage *Note 1 3. Transmit 1) Auto tuning 2.3 ±...
  • Page 21 *Note 2: Only 1 DQT Balance needs to be adjusted (either DQT Balance 1 or DQT Balance 2). *Note 3: For the adjustment of the Maximum Deviation (dPMR Very Narrow). After adjusting the DQT Balance and Maximum Deviation (Analog), it is necessary to adjust the Maximum Deviation (dPMR Very Narrow).

  • Page 22: Troubleshooting

    TX-RX Unit with the KPG-171D. Note: “Service TX-RX unit” Data • When a new printed circuit board is used, the KENWOOD The following data is written on the service TX-RX unit: ESN changes, as does the Transceiver Information dis- Data Type...
  • Page 23 PRINTED CIRCUIT BOARD TX-RX UNIT (XC1-0072-70) --- Component side view (J7C-0007-00) --- C602 R607 D600 Q602 IC600 C611 C615 IC604 R983 C612 R609 R752 C756 C745 C604 C759 C748 C741 R233 C737 Q601 C626 R744 R765 CN601 R766 R231 D700 R905 R783 R767...
  • Page 24 TX-RX UNIT (XC1-0072-70) --- Foil side view (J7C-0007-00) --- C428 L702 R751 L220 R418 C496 S601 C736 S602 R413 C279 S603 C495 R417 R824 C493 C409 C492 CN912 CN913 CN914 C491 C435 C489 C274 C464 R435 R401 C472 C457 C433 L217 CP401 CP402...
  • Page 25 SCHEMATIC DIAGRAM TX-RX UNIT (XC1-0072-70) PLL SYSTEM 5.0V R775 R776 2-70 2-71 0.01u 100p 0.01u PVDD 100p CPVDD RFINP 2.7V TEST4 RFINN TEST1 100p VREF2 DVSS AK1541 DATA VREF1 TH_DET D203,D204 0.22u (-71) ANT SW 270p 150k 0.5V SOLDER TX(UHF) FINAL AMP R250 C268...
  • Page 26 LEVEL DIAGRAM Receiver Section RF (Center Frequency) IF1 (49.95MHz) IF2 (450kHz) AF (1kHz) N : –117.0dBm 96mVrms 73mVrms 14mVrms 0.63Vrms N : –104.0dBm N : –121.5dBm –106.0dBm N : –110.0dBm N : –106.5dBm 0.80Vrms 72mVrms 355mVrms Baseband Baseband IF AMP FM IC IC707 J601...
  • Page 27 BLOCK DIAGRAM TX-RX UNIT (XC1-0072-70) TX VCO RX VCO 1st LOCAL TX/RX IC601 XC6209B502P-G IC2 AK1541 Q2 2SC5636 T X / R X TK-3401D E 50M (5.0V) PLL_DATA 446.00625~446.196875MHz 396.05625~396.246875MHz 396.05625~396.246875MHz 446.00625~446.196875MHz TK-3401D T PLL_CLK Q601 SSM6L36FE PLL_LE 50T (5.0V)
  • Page 28 MEMO...
  • Page 29 PARTS LIST [TK-3401D] * 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 30 Exploded view of general assembly and parts list Block No.M1MM TX-RX UNIT<01> 3-2(No.RA012<Rev.001>)
  • Page 31 General assembly Block No. [M][1][M][M]  Symbol No. Part No. Part Name Description Local A0C-0032-00 PLASTIC CABINET ASSY B43-1693-04 BADGE(KENWOODD-FRONT) B43-1694-04 BADGE(KENWOODD) B4D-0004-00 BADGE(PROTALK) D10-0649-03 LEVER D21-0863-04 SHAFT D32-0441-13 STOPPER T90-1043-15 ANTENNA ELEMENT E23-1253-14 TERMINAL(GROUND) E23-1395-04 TERMINAL(+VE) E37-1288-05 PARALLEL CORD F07-1882-23 COVER(ANT) G01-4542-04...
  • Page 32 Electrical parts list TX-RX UNIT  Symbol No. Part No. Part Name Description Local XC1-0072-70 BBY66-02V VARIABLE CAPACITANCE DIODE Block No. [0][1] BBY66-02V VARIABLE CAPACITANCE DIODE KDS160E-P DIODE  Symbol No. Part No. Part Name Description Local BBY57-02V VARIABLE CAPACITANCE DIODE BBY57-02V VARIABLE CAPACITANCE DIODE BB555-02V...
  • Page 33  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local CC73HCH1H0R5B C CAPACITOR 0.5PF B C280 CC73GCH1H3R5B C CAPACITOR 3.5PF B CK73HB1H271K C CAPACITOR 270PF K C400 CK73HB1A104K C CAPACITOR 0.10UF K CC73HCH1H0R5B C CAPACITOR 0.5PF B C402...
  • Page 34  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local C494 CK73HB1A224K C CAPACITOR 0.22UF K C777 CK73HB1A683K C CAPACITOR 0.068UF K C495 CK73HB1A104K C CAPACITOR 0.10UF K C778 CK73HB1H271K C CAPACITOR 270PF K C496 CK73GB0J106K...
  • Page 35  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local RK73HB1J105J MG RESISTOR 1.0M J 1/16W R407 RK73HB1J332J MG RESISTOR 3.3K J 1/16W RK73HB1J103J MG RESISTOR 10K J 1/16W R408 RK73HB1J332J MG RESISTOR 3.3K J 1/16W RK73HB1J474J MG RESISTOR...
  • Page 36  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local R755 RK73HB1J564J MG RESISTOR 560K J 1/16W R984 RK73GB2A000J MG RESISTOR 0.0 J 1/10W R756 RK73HB1J100J MG RESISTOR 10 J 1/16W R987 RK73GB2A000J MG RESISTOR 0.0 J 1/10W...
  • Page 37  Symbol No. Part No. Part Name Description Local CN915 E23-1167-05 TERMINAL CN916 E23-1167-05 TERMINAL CN917 E23-1167-05 TERMINAL CN918 E23-1167-05 TERMINAL CN919 E23-1167-05 TERMINAL CN920 E23-1167-05 TERMINAL CN921 E23-1167-05 TERMINAL CN922 E23-1167-05 TERMINAL RK75HA1J101J CHIP-COM 100 J 1/16W CP20 RK75HA1J473J CHIP-COM 47K J 1/16W CP21...
  • Page 38 JVC KENWOOD Corporation Communications Equipment BU (No.RA012<Rev.001>) Printed in Japan...