Kenwood NX-340 Service Manual
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Kenwood NX-340 Service Manual

Uhf digital transceiver
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SERVICE MANUAL
B5B-7102-20
12
2014
RA003<Rev.004>
COPYRIGHT © 2014 JVC KENWOOD Corporation
1
Precaution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2
Specific Service Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
4
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
5
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
This product complies with the RoHS directive for the European market.
B5B-7102-20
SERVICE MANUAL
UHF DIGITAL TRANSCEIVER
NX-340, NX-340(U)
Note :
Lead free solder used in the board (material : Sn, Ag, In, Bi, melting point : 227 Centigrade)
REVISED
This service manual has been revised due to the addition of NX-340 type K3
COPYRIGHT © 2014 JVC KENWOOD Corporation

TABLE OF CONTENTS

This product uses Lead Free solder.
No.RA003<Rev.004>
2014/12

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  • Page 1 TROUBLESHOOTING ..............1-20 REVISED This service manual has been revised due to the addition of NX-340 type K3 This product complies with the RoHS directive for the European market.
  • 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 10% Modulation 11K0F3E, 4K00F1E, 4K00F1D, 4K00F7W, 4K00F2D Analog measurements made per TIA/EIA-603 and specifications shown are typical. JVC KENWOOD Corporation reserves the right to change specifications without prior notice or obligation. (No.RA003<Rev.004>)1-3...
  • Page 4 SECTION 1 PRECAUTION This service manual does not describe PRECAUTION. SECTION 2 SPECIFIC SERVICE INSTRUCTIONS CIRCUIT DESCRIPTION 2.1.1 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.
  • Page 5 2.1.2.3 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 6 2.1.3.3 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 7 2.1.5 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 8 2.1.6 Signaling Circuit 2.1.6.1 Encode Low-speed data (QT, DQT) Low-speed data is output from pin 29 of the MCU. The signal passes through the low pass CR filter, and goes to the audio processor (IC705). The signal is mixed with the audio signal and goes to the VCO and TCXO (X1) modulation input after passing through the D/A converter inside the audio processor (IC705) for BAL adjustment.
  • Page 9 2.1.7 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 10 2.1.8.2 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 11 Name Function Name Function 34 RSSI RSSI input 79 CML_EPSO SPI output 35 BUSY BUSY input 80 CML_EPSI SPI input 36 TH_DET Thermistor detection (Temperature 81 EEP_DATAI Data input for EEPROM detection) 82 EEP_DATAO Data output to EEPROM 37 33MSC I/O 33M switch control 83 EEP_CS Chip select for EEPROM...
  • Page 12 Ref. Part Name Description Ref. Part Name Description IC710 Q715 Transistor Q714 control IC713 Clock buffer amplifier Q716 AF switch (EXT SP) IC715 Voltage regulator (33MD) Variable capacitance diode RX VCO tune IC717 Audio buffer amplifier Variable capacitance diode TX VCO tune DC switch (Assist) Variable capacitance diode RX VCO tune Transistor...
  • Page 13 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 14 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 15 3.2.4 Mounting the Chassis to the Case Assembly 3.2.6 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 16 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 17 Frequency and Signaling NXDN mode signaling The transceiver has been adjusted for the frequencies shown in the following table. When required, readjust them following the RAN1 RAN1 adjustment procedure to obtain the frequencies you want in ac- None tual operation. RAN1 Maximum Deviation Pattern Test frequency...
  • Page 18 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 4.0 ± 0.1V Assist voltage *Note 1 2) CH: Low TX-RX CVIN Check 0.6V or more...
  • Page 19 Item Condition Measurement Adjustment Specifica- tions Test- Unit Terminal Unit Parts Method /Remarks equipment 6. Maximum (1)TEST CH: Low, Low', Center, Deviation FPU 1.337kHz ±50Hz Deviation High', High (5 point) meter (NXDN Very (2)Deviation meter filter Oscillo- Narrow) LPF: 15kHz scope HPF: OFF *Note 4...

  • Page 20: Troubleshooting

    Frequency range (MHz) RF power Type NX-340 K, M TX/RX 450~520 5.0W NX-340(U) K Choose the type of transceiver NX-340 K2, P, M2, M3 TX/RX 400~470 5.0W NX-340(U) K2 Transceiver programming TX/RX 350~400 5.0W NX-340 K3 A personal computer, programming interface (KPG-22A/22U), and FPU (programming software) are required for programming.
  • Page 21 REALIGNMENT 5.2.3 PC Mode 5.2.1 Modes 5.2.3.1 Preface The transceiver is programmed by using a personal computer, a User mode programming interface (KPG-22A/22U) and the FPU (program- ming software). The programming software can be used with a PC. Figure 1 PC mode Data programming mode shows the setup of a PC for programming.
  • Page 22 • Once a unit is set to be the source, it cannot be a target after NX-340 K, K2, K3, P, M, M2, M3 KPG-169D the data has been transmitted. This protects the data in the NX-340(U) K, K2 KPG-170D source unit. • Electronic interface may cause a failure in data transfer dur- 5.2.3.6...
  • Page 23 KPG-169D (NX-340) / KPG-170D (NX-340U). 488.000 438.000 369.000 Note: • When a new printed circuit board is used, the KENWOOD Replacing TX-RX Unit ESN changes, as does the Transceiver Information dis- TX-RX unit Information play of the KPG-169D (NX-340) / KPG-170D (NX-340U),...
  • Page 24 TERMINAL FUNCTION 5.4.1 TX-RX unit (X57-8510-XX) 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 25 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8510-10 (NX-340_K, NX-340(U)_K, NX-340_M), X57-8510-11 (NX-340_K2, NX-340(U)_K2, NX-340_M2, NX-340_M3, NX-340_P), X57-8510-12 (NX-340-K3)) X57-851X-XX CP401 CP402 L204 L211 L407 L408 L417 L420 R211 R213 R214 R227 R236 R239 R417 R430 R435 R436 R438 R439 R775 R776 R778...
  • Page 26 MEMO (No.RA003<Rev.004>) 2-2...
  • Page 27 PRINTED CIRCUIT BOARD TX-RX UNIT (X57-8510-10 (NX-340_K, NX-340(U)_K, NX-340_M), X57-8510-11 (NX-340_K2, NX-340(U)_K2, NX-340_M2, NX-340_M3, NX-340_P), X57-8510-12 (NX-340_K3)) --- Component side view (J79-0401-19) --- C602 R607 D600 Q602 IC600 C611 C615 IC604 C612 R609 R752 C756 C745 C604 C759 C748 C741...
  • Page 28 TX-RX UNIT (X57-8510-10 (NX-340_K, NX-340(U)_K, NX-340_M), X57-8510-11 (NX-340_K2, NX-340(U)_K2, NX-340_M2, NX-340_M3, NX-340_P), X57-8510-12 (NX-340_K3)) --- Foil side view (J79-0401-19) --- C428 L702 R751 S601 L220 R418 S601 S602 S603 C736 C496 R413 C279 C495 R417 R824 C493 C409 C492 CN912...

  • Page 29: Level Diagram

    LEVEL DIAGRAM Receiver Section RF (Center Frequency) IF1 (49.95MHz) IF2 (450kHz) AF (1kHz) N : –116dBm 82mVrms 91.91mVrms 15.28mVrms 0.63Vrms N : –102dBm N : –120.5dBm N : –119.5dBm N : –107dBm N : –104dBm 90.98mVrms 460mVrms 0.88Vrms Baseband Baseband IF AMP FM IC IC707...

  • Page 30: Block Diagram

    BLOCK DIAGRAM TX-RX UNIT (X57-8510-10 (NX-340_K, NX-340(U)_K, NX-340_M), X57-8510-11 (NX-340_K2, NX-340(U)_K2, NX-340_M2, NX-340_M3, NX-340_P), X57-8510-12 (NX-340_K3)) TX VCO RX VCO 1st LOCAL TX/RX NX-340-K, NX-340(U)-K 450.00~520.00MHz 400.05~470.05MHz 400.05~470.05MHz 450.00~520.00MHz NX-340-M IC2 AK1541 Q2 2SC5636 IC601 XC6209B502P-G T X / R X NX-340-K2, NX-340-P, NX-340-M2 400.00~470.00MHz...

  • Page 31: Parts List

    PARTS LIST [NX-340,NX-340(U)] * 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 32 Exploded view of general assembly and parts list Block No.M1MM TX-RX UNIT<01> 3-2(No.RA003<Rev.004>)
  • Page 33 N30-2604-48 PAN HEAD MACHINE SCREW (x2) N83-2005-48 PAN HEAD TAPTITE SCREW (x13) X60-4130-10 SERVICE TX-RX UNIT NX-340_K X60-4130-11 SERVICE TX-RX UNIT NX-340(U)_K X60-4130-12 SERVICE TX-RX UNIT NX-340_K2 X60-4130-13 SERVICE TX-RX UNIT NX-340(U)_K2 X60-4130-14 SERVICE TX-RX UNIT NX-340_K3 X60-4130-21 SERVICE TX-RX UNIT...
  • Page 34 2SB1132(Q,R) TRANSISTOR Q715 UMG3N TRANSISTOR 340_M2,NX-340_M3,NX-340_P) Q716 2SK3577-A X57-8510-12(NX-340_K3) 1SV325F VARIABLE CAPACITANCE DIODE Block No. [0][1] 1SV325F VARIABLE CAPACITANCE DIODE NX-340_K,NX-340(U)_K,NX-340_M VARIABLE CAPACITANCE DIODE NX-340_K2,NX-340_K3,NX-340(U)_K2, 1SV323F Symbol NX-340_M2,NX-340_M3,NX-340_P Part No. Part Name Description Local  1SV325F VARIABLE CAPACITANCE DIODE 1SV325F...
  • Page 35 CK73HB1A473K C CAPACITOR 0.047UF K CK73HB1H271K C CAPACITOR 270PF K CK73HB1E103K C CAPACITOR 0.010UF K CC73HCH1H560J C CAPACITOR 56PF J NX-340_K,NX-340(U)_K,NX-340_M CC73HCH1H101J C CAPACITOR 100PF J CC73HCH1H101J C CAPACITOR 100PF J NX-340_K2,NX-340_K3,NX-340(U)_K2, CC73HCH1H101J C CAPACITOR 100PF J CK73HB1A224K C CAPACITOR 0.22UF K...
  • Page 36 0.010UF K C263 CK73HB1H271K C CAPACITOR 270PF K C426 CK73HB1E103K C CAPACITOR 0.010UF K C265 CC73GCH1H2R5B C CAPACITOR 2.5PF B NX-340_K,NX-340(U)_K,NX-340_M C428 CC73HCH1H020B C CAPACITOR 2.0PF B C429 CC73HCH1H100C C CAPACITOR 10PF C NX-340_K,NX-340(U)_K,NX-340_M NX-340_K2,NX-340(U)_K2,NX- C265 CC73GCH1H030B C CAPACITOR 3.0PF B...
  • Page 37 CC73HCH1H101J C CAPACITOR 100PF J C458 CC73HCH1H1R5B C CAPACITOR 1.5PF B C494 CK73HB1A224K C CAPACITOR 0.22UF K C459 CC73HCH1H110G C CAPACITOR 11PF G NX-340_K,NX-340(U)_K,NX-340_M C495 CK73HB1A104K C CAPACITOR 0.10UF K C496 CK73GB0J106K C CAPACITOR 10UF K NX-340_K2,NX-340(U)_K2,NX- C459 CC73HCH1H240J C CAPACITOR...
  • Page 38 C CAPACITOR 10UF K RK73HB1J474J MG RESISTOR 470K J 1/16W C786 CK73HB1A224K C CAPACITOR 0.22UF K RK73HB1J105J MG RESISTOR 1.0M J 1/16W NX-340_K,NX-340(U)_K,NX-340_M C787 CK73HB1A104K C CAPACITOR 0.10UF K NX-340_K2,NX-340_K3,NX-340(U)_K2, RK73HB1J106J MG RESISTOR 10M J 1/16W C788 CK73FB0J226M C CAPACITOR...
  • Page 39 RK73HB1J333J MG RESISTOR 33K J 1/16W NX-340_K3 R226 RK73HB1J472J MG RESISTOR 4.7K J 1/16W NX-340_K,NX-340_K2,NX-340(U)_K, R227 RK73HB1J273J MG RESISTOR 27K J 1/16W NX-340_K,NX-340(U)_K,NX-340_M R438 RK73HB1J104J MG RESISTOR 100K J 1/16W NX-340(U)_K2,NX-340_M,NX- 18K J 1/16W NX-340_K2,NX-340_K3,NX-340(U)_K2, 340_M2,NX-340_M3,NX-340_P R227 RK73HB1J183J MG RESISTOR...
  • Page 40 RK73HB1J101J MG RESISTOR 100 J 1/16W R774 RK73HB1J101J MG RESISTOR 100 J 1/16W R775 RK73HB1J000J MG RESISTOR 0.0 J 1/16W NX-340_K,NX-340(U)_K,NX-340_M L41-4795-39 SMALL FIXED INDUCTOR (4.7UH) L92-0442-05 CHIP FERRITE 0.0 J 1/16W NX-340_K2,NX-340(U)_K2,NX- R776 RK73HB1J000J MG RESISTOR L92-0163-05 BEADS CORE...
  • Page 41 Symbol Part No. Part Name Description Local  L408 L40-1875-92 SMALL FIXED INDUCTOR (18NH) NX-340_K,NX-340(U)_K,NX-340_M NX-340_K2,NX-340_K3,NX-340(U)_K2, L408 L40-2775-92 SMALL FIXED INDUCTOR (27NH) NX-340_M2,NX-340_M3,NX-340_P L410 L41-8268-14 SMALL FIXED INDUCTOR (8.2NH) L411 L41-8268-14 SMALL FIXED INDUCTOR (8.2NH) L412 L92-0138-05 CHIP FERRITE L413 L41-8268-14 SMALL FIXED INDUCTOR (8.2NH)
  • Page 42 Packing materials and accessories parts list Block No.M2MM Illstration is NX-340(K,K2,K3,P,M3) and NX-340(U)(K,K2). , , , NX-340(K,K2,K3,P,M3) /NX-340(U)(K,K2) NX-340(K,K2,K3,P) /NX-340(U)(K,K2) Packing and accessories Block No. [M][2][M][M]  Symbol No. Part No. Part Name Description Local B09-0758-03 CAP(SP/MIC) ------------ PAMPHLET(SAR) ------------...
  • Page 43 MEMO...
  • Page 44 JVC KENWOOD Corporation Communications Systems BU (No.RA003<Rev.004>) Printed in Japan...

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Nx-340u

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