Download
Share
Print this page
Kenwood NX-340 Service Manual
  1. Manuals
  2. Brands
  3. Kenwood Manuals
  4. Transceiver
  5. NEXEDGE NX-340
  6. Service manual

Kenwood NX-340 Service Manual

Uhf digital transceiver
Hide thumbs Also See for NX-340:

Advertisement

Quick Links

See also: Instruction Manual
B5B-7197-00
3 S ERVICE MANUAL
2015
RA024<Rev.001>
COPYRIGHT © 2015 JVC KENWOOD Corporation
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
This product complies with the RoHS directive for the European market.
B5B-7197-00
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)
This service manual is applied for Hardware Ver 2.0 transceivers (K, M types) with
B52xxxxx or subsequent serial numbers.
COPYRIGHT © 2015 JVC KENWOOD Corporation

TABLE OF CONTENTS

This product uses Lead Free solder.
No.RA024<Rev.001>
2015/3

Advertisement

loading

Related Manuals for Kenwood NX-340

Summary of Contents for Kenwood NX-340

  • Page 1: Table Of Contents

    2015 3 S ERVICE MANUAL B5B-7197-00 NX-340, NX-340(U) COPYRIGHT © 2015 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 16K0F3E, 11K0F3E, 4K00F1E, 4K00F1D, 4K00F7W, 4K00F2D, 8K30F1E, 8K30F1D, 8K30F7W Analog measurements made per TIA/EIA-603 and specifications shown are typical. Digital measurements made per NXDN CAI and specifications shown are typical. JVC KENWOOD Corporation reserves the right to change specifications without prior notice or obligation. (No.RA024<Rev.001>)1-3...

  • Page 4: Precaution

    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 IC709 AF power amplifier (INT) Q713 AF switch (EXT SP) IC710 Q714 Transistor DC switch (IC709 SB) IC713 Clock buffer amplifier Q715 Transistor Q714 control IC715 Voltage regulator (33MD) Q716 AF switch (EXT SP) IC717 Audio buffer amplifier Variable capacitance diode RX VCO tune...

  • Page 13: 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 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: 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 17 Frequency and Signaling Preparations for Tuning the Transceiver The transceiver has been adjusted for the frequencies shown in Before attempting to tune the transceiver, connect the unit to a the following table. When required, readjust them following the suitable power supply. adjustment procedure to obtain the frequencies you want in ac- Whenever the transmitter is tuned, the unit must be connected to tual operation.
  • 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 (Analog Wide) (1)TEST CH: Low, Low', Center, Deviation FPU 4.0kHz (According to ±80Hz High', High (5 point) meter larger +, -) Note: (2)Deviation meter filter Oscillo- FPU auto in- LPF: 15kHz scope...
  • Page 20 Item Condition Measurement Adjustment Specifica- tions Test- Unit Terminal Unit Parts Method /Remarks equipment 11. MSK (1)TEST CH: Center Deviation FPU 1.5kHz ±50Hz Deviation (2)Deviation meter filter meter (Analog LPF: 15kHz Oscillo- Narrow) HPF: OFF scope (3)PTT ON (Analog Wide) (1)TEST CH: Center Deviation FPU 3.0kHz ±50Hz...
  • Page 21 Item Condition Measurement Adjustment Specifica- tions Test- Unit Terminal Unit Parts Method /Remarks equipment (Analog Wide) (1)TEST CH: Low, Center, High (3 point) FPU Press [Start] (2)SSG output: -120dBm (0.22uV) Oscilloscope (Auto tuning) AF Freq : 1kHz Audio Mod Dev : ±3.0kHz Analyzer (NXDN Very Narrow) (1)TEST CH: Low, Center, High (3 point) FPU Press [Start]...

  • Page 22: Troubleshooting

    SECTION 5 TROUBLESHOOTING SYSTEM SET-UP Merchandise received Frequency range (MHz) RF power Type NX-340 K, M TX/RX 450~520 5.0W Choose the type of transceiver NX-340(U) K A personal computer, programming interface (KPG-22A/22U), and FPU (programming software) are required for programming.
  • Page 23 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 24 • The language available is only English. Model Type • Once a unit is set to be the source, it cannot be a target after NX-340 K, M KPG-169D the data has been transmitted. This protects the data in the...
  • Page 25 488.000 with the KPG-169D (NX-340) / KPG-170D (NX-340U). Replacing TX-RX Unit Note: • When a new printed circuit board is used, the KENWOOD TX-RX unit Information ESN changes, as does the Transceiver Information dis- Model Name Original TX-RX unit For Service TX-RX...
  • Page 26 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 27 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8510-10) CP401 CP402 L204 L211 L405 L407 L408 L417 L420 R211 R213 R214 R227 R236 R239 R417 R430 R435 R436 R438 R439 R775 R797 R798 C202 C207 C208 C216 C227 C234 C242 C244 C248 UHF 450-520MHz 0-10 RK75HA1J474J RK75HA1J474J...
  • Page 28 MEMO (No.RA024<Rev.001>) 2-2...
  • Page 29 PRINTED CIRCUIT BOARD TX-RX UNIT (X57-8510-10) --- Component side view (J7C-0114-00) --- C602 R607 D600 Q602 C611 C615 IC600 IC604 R983 C612 R609 R752 C756 C745 C604 C759 D605 C748 C741 R233 C737 Q601 C626 R744 R765 CN601 R766 R231 D700 R253 R905...
  • Page 30 TX-RX UNIT (X57-8510-10) --- Foil side view (J7C-0114-00) --- Q403 C428 R403 R751 L220 R459 R418 R461 C496 R457 C736 S601 S603 R407 S602 IC719 C279 C495 R824 C493 C409 CN912 C492 CN913 CN914 R413 C491 R417 C435 C489 C272 C274 C464 R435...
  • Page 31 LEVEL DIAGRAM Receiver Section RF (Center Frequency) IF1 (49.95MHz) AF (1kHz) IF2 (450kHz) 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 32 BLOCK DIAGRAM TX-RX UNIT (X57-8510-10) IC2 AK1541 Q2 2SC5636 IC601 XC6209B502P-G TX VCO RX VCO 1st LOCAL TX/RX TX/RX NX-340-K, NX-340(U)-K AV R 50M (5.0V) PLL_DAT A 450.00~520.00MHz 400.05~470.05MHz 400.05~470.05MHz 450.00~520.00MHz NX-340-M PLL_CLK Q601 SSM6L36FE PLL_LE 50T (5.0V) BAT T...
  • Page 33 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 34 Exploded view of general assembly and parts list Block No.M1MM TX-RX UNIT<01> 3-2(No.RA024<Rev.001>)
  • Page 35 General assembly Block No. [M][1][M][M]  Symbol No. Part No. Part Name Description Local A02-4228-23 PLASTIC CABINET ASSY A1A-0029-00 CHASSIS B43-1693-04 BADGE(KENWOOD-FRONT) B43-1694-04 BADGE(KENWOOD) B43-1700-04 BADGE(NEXEDGE) D10-0649-03 LEVER D21-0863-04 SHAFT D32-0441-13 STOPPER E04-0477-15 RF COAXIAL RECEPTACLE(SMA) E23-1253-24 TERMINAL(GROUND) E23-1395-04 TERMINAL(+VE)
  • Page 36 Electrical parts list TX-RX UNIT  Symbol No. Part No. Part Name Description Local X57-8510-10 1SV325F VARIABLE CAPACITANCE DIODE Block No. [0][1] 1SV325F VARIABLE CAPACITANCE DIODE 1SV325F VARIABLE CAPACITANCE DIODE  Symbol No. Part No. Part Name Description Local 1SV325F VARIABLE CAPACITANCE DIODE KDS160E-P DIODE...
  • Page 37  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local CC73HCH1H050B C CAPACITOR 5.0PF B C278 CC73GCH1H070B C CAPACITOR 7.0PF B CC73HCH1H040B C CAPACITOR 4.0PF B C279 CC73GCH1H010B C CAPACITOR 1.0PF B CK73HB1H271K C CAPACITOR 270PF K...
  • Page 38  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local C491 CK73HB1A105K C CAPACITOR 1.0UF K C771 CK73HB1H271K C CAPACITOR 270PF K C492 CC73HCH1H101J C CAPACITOR 100PF J C772 CC73HCH1H470J C CAPACITOR 47PF J C493 CC73HCH1H101J C CAPACITOR...
  • Page 39  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local RK73HB1J000J MG RESISTOR 0.0 J 1/16W R401 RK73HB1J101J MG RESISTOR 100 J 1/16W RK73HB1J152J MG RESISTOR 1.5K J 1/16W R403 RK73HB1J222J MG RESISTOR 2.2K J 1/16W RK73HB1J391J MG RESISTOR...
  • Page 40  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local R736 RK73HB1J101J MG RESISTOR 100 J 1/16W R907 RK73HB1J000J MG RESISTOR 0.0 J 1/16W R737 RK73HB1J101J MG RESISTOR 100 J 1/16W R960 RK73HB1J000J MG RESISTOR 0.0 J 1/16W...
  • Page 41  Symbol No. Part No. Part Name Description Local L903 LB73H0AV-003 CHIP FERRITE BEADS CN600 E40-6922-05 FLAT CABLE CONNECTOR CN912 E23-1167-05 TERMINAL CN913 E23-1167-05 TERMINAL CN914 E23-1167-05 TERMINAL 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...
  • Page 42 Packing materials and accessories parts list Block No.M2MM Illstration is NX-340(K) and NX-340(U)(K). , , , NX-340(K) /NX-340(U)(K) NX-340(K) /NX-340(U)(K) 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.RA024<Rev.001>) Printed in Japan...

This manual is also suitable for:

Nx-340u