Kenwood NX-720H(G) Service Manual

Vhf digital transceiver

Hide thumbs Also See for NX-720H(G):

Instruction manual (24 pages)

Instruction manual (72 pages)

Instruction manual (72 pages)

Table of Contents

Quick Links

Summary of Contents for Kenwood NX-720H(G)

Page 1: Table Of Contents
VHF DIGITAL TRANSCEIVER NX-720H(G)/720H SERVICE MANUAL © 2012-9 PRINTED IN JA PAN B53-7032-00 ( Y ) 672 Key top Modular jack Panel assy Badge (K29-9479-01) (E58-0535-05) (A62-1200-03) (B43-1675-04) CONTENTS GENERAL ............2 TERMINAL FUNCTION ......56 SYSTEM SET-UP .........4 PC BOARD REALIGNMENT ...........4 DISPLAY UNIT (X54-3830-10) ....60 INSTALLATION ..........7 TX-RX UNIT (X57-8230-1X)....62...
Page 2: General
Disclaimer While every precaution has been taken in the preparation Transceivers containing AMBE+2™ Vocoder: of this manual, JVC KENWOOD Corporation assumes no The AMBE+2™ voice coding technology is embedded in responsibility for errors or omissions. Neither is any liability the ﬁ rmware under the license of Digital Voice Systems, Inc.
Page 3 4. INSTALLATION PLANNING – CONTROL STATIONS 4-1. Antenna system Control station. The antenna system selection depends on many factors and is beyond the scope of this manual. Your KENWOOD dealer can help you select an antenna sys- Antenna ACC. cap connector W/GPS Type tem that will best serve your particular needs.
Page 4: System Set-Up
NX-720H(G)/720H SYSTEM SET-UP Merchandise received Frequency range (MHz) RF power Type 136~174 NX-720H K Choose the type of transceiver 136~174 NX-720H(G) K See page 4. Transceiver programming A personal computer, programming interface (KPG-46A/46U), and FPU (programming software) are required for programming. KCT-60 (Option) Connection cable...
Page 5 1. Start up the ﬁ rmware programming software (Fpro.exe(ver. load from the following URL: 6.1 or later)). The Fpro.exe exists in the KPG-141D in- http//www.kenwood.com/usb-com/ stalled holder. (This URL may change without notice.) 2. Set the communications speed (normally, 115200 bps)and communications port in the conﬁ...
Page 6: Clone Mode
NX-720H(G)/720H REALIGNMENT 6-4. Function If you press the [ key while “FIRM PRG” is displayed, the checksum is calculated, and a result is displayed.If you press the [ key again while the checksum isdisplayed, “FIRM PRG” is redisplayed. Note: • This mode cannot be entered if the Firmware Program- ming mode is set to Disable in the Programming software.
Page 7: Installation
NX-720H(G)/720H INSTALLATION 2-1. Installation Procedure 1. Connection Cable (KCT-60: Option) 1. Remove the ACC. cap on the rear of the transceiver. The KCT-60 connection cable kit is used to connect the 2. Connect the D-sub connector of the KCT-60 to the D-sub transceiver to a Horn alert cable, KCT-18 (Ignition sense 15-pin terminal of the transceiver.
Page 8 NX-720H(G)/720H INSTALLATION Remove the R664, R635, R662, R659, R658 and R632 4. External Speaker (Option) chip jumpers and solder the chip jumpers to R666, R633, 4-1. KES-5 R665, R663, R660 and R630. External speaker KES-5 can be installed for KCT-60. ■...
Page 9: Disassembly For Repair
NX-720H(G)/720H DISASSEMBLY FOR REPAIR 3. Disconnect the ﬂ at cable from connector of the panel as- 1. Disassembly Procedure sembly. 1. Remove the cabinet, top packing and shielding plate of the transceiver. Cabinet Flat cable 4. Hook the finger to hole and while pulling the speaker holder to this side, expand the panel side of a to c , and remove the speaker holder from the front panel.
Page 10 NX-720H(G)/720H DISASSEMBLY FOR REPAIR Note: 2. When mounting the panel assembly, pass the ﬂ at cable through the hole of the chassis as shown below then con- When you supply power to the TX-RX PCB after remov- nect the ﬂ at cable to connector of the panel assembly. ing the TX-RX PCB from the chassis, solder the positive and ground terminals of the DC cord (Recommendation: Panel assembly...
Page 11: Circuit Description
NX-720H(G)/720H CIRCUIT DESCRIPTION 1. Overview 3. Receiver System The NX-720 is a VHF Mobile transceiver designed to 3-1. RF circuit operate in the frequency range of 136 to 174MHz. The unit An incoming RF signal from the antenna terminal is consists of a receiver, transmitter, phase-locked loop (PLL) passed through the antenna switch (D110, 111 and 107) frequency synthesizer, base band parts, power supply, and...
Page 12 NX-720H(G)/720H CIRCUIT DESCRIPTION 4-1. Audio Band Circuit 3-3. Audio ampliﬁ er circuit The signal from the microphone is ampliﬁ ed by IC703 (1/2) Audio processing (high-pass filter, low-pass filter, de- and limited by the AGC circuit composed of D703, D704, emphasized and so on) in FM mode and decoding in NXDN Q703 and Q704.
Page 13 NX-720H(G)/720H CIRCUIT DESCRIPTION 5-3. PLL IC (IC2) 5. PLL Frequency Synthesizer The PLL IC compares the differences in phases of the 5-1. TCXO (X1) VCO oscillation frequency and the TCXO reference fre- The TCXO (X1) generates a reference frequency of quency, returns the difference to the VCO CV terminal and 16.8MHz for the PLL frequency synthesizer.
Page 14 NX-720H(G)/720H CIRCUIT DESCRIPTION 6-5. DSP 6. Control Circuit The DSP circuit consists of a DSP (IC502) and processes the base The control circuit consists of the ASIC (IC507) and its band signal. The DSP operates on an external clock of 18.432MHz peripheral circuits.
Page 15 NX-720H(G)/720H CIRCUIT DESCRIPTION Fig. 16 Power supply circuit...
Page 16 NX-720H(G)/720H CIRCUIT DESCRIPTION 8. Signaling Circuit 8-1. Encode (QT/DQT/DTMF/2TONE/MSK) Each signaling data signal of the QT, DQT, DTMF, 2TONE and MSK is generated by the DSP circuit, superposed on a modulation signal and output from the ASIC (IC507). Each deviation of the TX QT, DQT, DTMF, 2TONE and MSK tones are adjusted by changing the output level of the DSP (IC502) and the resulting signal is routed to the VCO and PLL.
Page 17: Components Description
NX-720H(G)/720H COMPONENTS DESCRIPTION Display unit (X54-3830-10) TX-RX unit (X57-8230-10) Ref.No Part Name Description Ref.No Part Name Description LCD Driver AVR(80C) TRANSISTOR TX/Busy LED Switch PLL System TRANSISTOR TX/Busy LED Switch DC AMP(CV/Assist) TRANSISTOR LCD Backlight Switch IC102 TX Power Module TRANSISTOR Backlight Switch IC103...
Page 18 NX-720H(G)/720H COMPONENTS DESCRIPTION Ref. No Part Name Description Ref. No. Part Name Description Transistor DC Switch(Assist) Zener Diode Over Voltage Protection Variable Capaci- DC Switch(Assist) RX VCO Frequency Control tance Diode Transistor Ripple Filter Variable Capaci- TX VCO Frequency Control tance Diode Transistor Buffer AMP(PLL Fin)
Page 19: Parts List
NX-720H(G)/720H PARTS LIST ✽ New Parts. indicates safety critical components. L : Scandinavia K : USA P : Canada Parts without Parts No. are not supplied. Y : PX (Far East, Hawaii) T : England E : Eu rope Les articles non mentionnes dans le Parts No. ne sont pas fournis. C : China X : Australia M : Oth er Areas...
Page 20 NX-720H(G)/720H PARTS LIST DISPLAY UNIT (X54-3830-10) TX-RX UNIT (X57-8230-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation RK73HB1J101J CHIP R 1/16W CK73FB1A106K CHIP C 10UF CC73HCH1H100B CHIP C 10PF RK73HB1J272J CHIP R...
Page 21 NX-720H(G)/720H PARTS LIST TX-RX UNIT (X57-8230-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation C313 CK73HB1A104K CHIP C 0.10UF C167 CC73GCH1H150J CHIP C 15PF C315 CK73HB1E103K CHIP C 0.010UF C168 CK73HB1H471K...
Page 22 NX-720H(G)/720H PARTS LIST TX-RX UNIT (X57-8230-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation C442 CK73HB1H103K CHIP C 0.010UF C570 CK73HB1A105K CHIP C 1.0UF C572-576 CK73HB1A104K CHIP C 0.10UF C443 CK73GB1E105K...
Page 23 NX-720H(G)/720H PARTS LIST TX-RX UNIT (X57-8230-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation C743 CC73HCH1H470J CHIP C 47PF F701 F53-0324-15 FUSE(2.5A) C744 CK73HB1A224K CHIP C 0.22UF C746 CK73HB1A104K CHIP C 0.10UF...
Page 24 NX-720H(G)/720H PARTS LIST TX-RX UNIT (X57-8230-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation L304 L40-5675-92 SMALL FIXED INDUCTOR(56NH) RK73HB1J182J CHIP R 1.8K 1/16W R35 -38 RK73HB1J000J CHIP R 1/16W L307 L40-2291-86...
Page 25 NX-720H(G)/720H PARTS LIST TX-RX UNIT (X57-8230-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation R344 RK73HB1J272J CHIP R 2.7K 1/16W R150 RK73HB1J124J CHIP R 120K 1/16W R345 RK73HB1J000J CHIP R 1/16W R152...
Page 26 NX-720H(G)/720H PARTS LIST TX-RX UNIT (X57-8230-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation R531 RK73HB1J104J CHIP R 100K 1/16W R674 RK73HB1J105J CHIP R 1.0M 1/16W R677-680 RK73GB2A000J CHIP R 1/10W R532...
Page 27 NX-720H(G)/720H PARTS LIST TX-RX UNIT (X57-8230-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation R805,806 RK73HB1J102J CHIP R 1.0K 1/16W D703,704 DA3S101F DIODE D705,706 EMZ6.8N ZENER DIODE R810 RK73HB1J123J CHIP R 1/16W...
Page 28 NX-720H(G)/720H PARTS LIST TX-RX UNIT (X57-8230-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation Q401 LTC014EEBFS8 TRANSISTOR Q402 2SA1955A-F TRANSISTOR Q403 MTM981400BF Q404 2SA1955A-F TRANSISTOR Q405 LTC014EEBFS8 TRANSISTOR Q407 FK330301 Q408...
Page 29: Exploded View
NX-720H(G)/720H EXPLODED VIEW : N30-2605-48(M2.6x5) (M3x8) : N67-3008-48 : N87-2608-48( 2.6X8) J501 J701 IC102 IC714 TX-RX unit Cx13 R358 (H type) (HG type) Display unit Caution label Model name plate Parts with the exploded numbers larger than 700 are not supplied. If a part reference number is listed in a box on the exploded view of the PCB, that part does not come with the PCB.
Page 30: Packing
NX-720H(G)/720H PACKING 706 Pamphlet Protection bag 8 Instruction Manual (B62-2421-00) 18 Fuse (Blade type) x 2 47 Bracket (F52-0024-05) (J29-0726-03) 41 Packing Fixture 12 DC cord assy (H12-4346-12) 40 Packing Fixture (E30-7523-55) (H12-4345-12) 50 Screw set (N99-2039-05) 52 Microphone(KMC-35) (T91-0639-55) 42 Item carton case (H52-2563-02) 43 Holder (MIC)
Page 31: Trouble Shooting
NX-720H(G)/720H TROUBLE SHOOTING Fault Diagnosis of the BGA (Ball Grid Array) IC Overview ■ A ﬂ owchart for determining whether or not the transceiver can be powered on (the LCD does not function even if the power switch is turned on) due to broken BGA parts. BGA parts ■...
Page 32 NX-720H(G)/720H TROUBLE SHOOTING When a normal Checking the signal output from value is confirmed. the ASIC by software control When an abnormal value is confirmed. Points to be checked Normal voltage Remove R407. If the ASIC side is 0V, SBC R407 3.3V the ASIC/FALSH/SRAM may be broken.
Page 33 NX-720H(G)/720H TROUBLE SHOOTING Failure diagnosis of the GPS section.(Built-in GPS model only) Overview: When the GPS function does not operate, use this ﬂ owchart to determine the problem. Note: The transceiver supplies the voltage to the GPS antenna and the voltage is checked when the transceiver is turned "ON". When the voltage is lower than the speciﬁ...
Page 34 Maintain the ESN data of the Trunking System KENWOOD ESN following the new ESN. Type : Kx When a new printed circuit board is used, the KENWOOD ESN The same number as the KENWOOD changes, as does the Transceiver Information display of the ESN label is written.
Page 35: Adjustment
NX-720H(G)/720H ADJUSTMENT ■ Key operation Controls “ ” not appears on the LCD display Function Display Power Volume Channel [ ]/[ ] Test channel up/down Channel No. switch Up/Down key Up/Down key Squelch level Push: Squelch level up Hold: Squelch off Squelch off: icon appears Wide: “W”...
Page 36 NX-720H(G)/720H ADJUSTMENT • LED indicator Frequency and Signaling ■ Red LED Lights during transmission. The transceiver has been adjusted for the frequencies Green LED Lights when there is carrier. shown in the following table. When required, readjust them following the adjustment procedure to obtain the frequencies •...
Page 37 NX-720H(G)/720H ADJUSTMENT Key operation ■ • NXDN mode signaling Function Push Hold (1 second) RAN1 RAN1 [ ]/[ ] Adjustment value up/down None 20Hz/2kHz (During transmis- RAN1 Maximum deviation pattern sion in balance adjustment) None FSW+PN9 (PC test mode only) Wide/Narrow/Very narrow RAN: Radio Access Number Shift to panel test mode...
Page 38 NX-720H(G)/720H ADJUSTMENT Adjustment item supplement ■ Adjustment Item Description The lock voltage of VCO (Receive) is adjusted. Receive Assist This item must be adjusted before all adjustment items for receiver section are adjusted. This item can be adjusted only in PC Test Mode. The lock voltage of VCO (Transmit) is adjusted.
Page 39 NX-720H(G)/720H ADJUSTMENT Adjustment item and Adjustment range ■ NV (NXDN Very Adjusutment Panel Adjust item (Analog Wide) (Analog Narrow) (NXDN Narrow) Narrow) Order item tuning test Number Adjustment range 9 point ADJ Common ✓ Receive Assist Section 2 1~4096 9 point ADJ Common ✓...
Page 40 NX-720H(G)/720H ADJUSTMENT NV (NXDN Very Adjusutment Panel Adjust item (Analog Wide) (Analog Narrow) (NXDN Narrow) Narrow) Order item tuning test Number Adjustment range - *1 Receiver ✓ ✓ RSSI Reference Section 4 1~256 - *1 Receiver ✓ ✓ Open Squelch Section 5 1~256 - *1...
Page 41 NX-720H(G)/720H ADJUSTMENT ] hold Analog MAX Deviation Analog MAX Deviation Narrow Wide ADEV ADEV ] press 5 reference level Adjustments ] hold QT Deviation QT Deviation Narrow Wide ] press ] hold DQT Deviation DQT Deviation Wide Narrow ] press ] hold LTR Deviation LTR Deviation...
Page 42 NX-720H(G)/720H ADJUSTMENT Test Equipment Required for Alignment Test Equipment Major Speciﬁ cations Frequency Range 100 to 520MHz Modulation Frequency modulation and external modulation 1. Standard Signal Generator Output –127dBm/0.1µV to greater than –20dBm/22.4mV (SSG) When performing the Frequency adjustment, the following accuracy is necessary. •...
Page 43 NX-720H(G)/720H ADJUSTMENT Radio check Section Measurement Adjustment Speciﬁ cations/ Item Panel test mode PC test mode Test- Termi- Remarks Unit Unit Parts Method equipment 1. Frequency 1) CH-Sig : 1-1 1) Test Channel f. counter Check an inter- +/-0.25ppm check PTT : ON Channel: 1 nal tempera-...
Page 44 NX-720H(G)/720H ADJUSTMENT Measurement Adjustment Speciﬁ cations/ Item Panel test mode PC test mode Test- Termi- Remarks Unit Unit Parts Method equipment 5. Sensitivity 1) CH-Sig: 1-1 1) Test Channel Check 12dB SINAD or check SSG output Channel: 1 AF VTVM Ext.SP more Wide 5k:...
Page 45 NX-720H(G)/720H ADJUSTMENT Measurement Adjustment Speciﬁ cations/ Panel test Item PC test mode Test- Ter- Remarks mode Unit Unit Parts Method equipment minal 4. Frequency  The Frequency 1) Adj item: [PC test mode] [PC test mode] adjustment can [Frequency] Press [Start] button of The value of “IF20”...
Page 46 NX-720H(G)/720H ADJUSTMENT Transmitter Section Measurement Adjustment Speciﬁ cations/ Item Panel test mode PC test mode Test- Termi- Remarks Unit Unit Parts Method equipment 1. High Transmit 1) Adj item: 1) TEST CH: Power [Panel tun- 53.0W : ±2.0W power Limit [HLMT] Low, Low’, Center, meter...
Page 47 NX-720H(G)/720H ADJUSTMENT Measurement Adjustment Speciﬁ cations/ Item Panel test mode PC test mode Test- Termi- Remarks Unit Unit Parts Method equipment 2.High Transmit 1) Adj item: 1) TEST CH: Power [Panel tun- 50.0W ±1.0W Power [HPWR] Low, Low’, Center, meter ing mode] 13.0A or less Adjust:[]...
Page 48 NX-720H(G)/720H ADJUSTMENT Measurement Adjustment Speciﬁ cations/ Item Panel test mode PC test mode Test- Termi- Remarks Unit Unit Parts Method equipment 4. Maximum De- Adj item: 1) Adj item: [Maximum Deviation [Panel tun- Write ﬁ xed value 2995~3117Hz viation (NXDN) [NDEV] Deviation (NXDN meter...
Page 49 NX-720H(G)/720H ADJUSTMENT Measurement Adjustment Speciﬁ cations/ Item Panel test mode PC test mode Test- Termi- Remarks Unit Unit Parts Method equipment 　 Adj item: 1) Adj item: [Maximum Deviation [Panel tun- Write ﬁ xed value “513” 2050~2150Hz 5. Maximum for each adjustment Deviation [ADEV] Deviation (Analog...
Page 50 NX-720H(G)/720H ADJUSTMENT Measurement Adjustment Speciﬁ cations/ Item Panel test mode PC test mode Test- Termi- Remarks Unit Unit Parts Method equipment 7. DQT Deviation 1) Adj item:[DQT] 1) Adj item: [DQT Deviation [Panel tun- Write the value 0.35kHz±0.05kHz Adjust:[.] adjust Deviation (Analog meter ing mode]...
Page 51 NX-720H(G)/720H ADJUSTMENT Measurement Adjustment Speciﬁ cations/ Item Panel test mode PC test mode Test- Termi- Remarks Unit Unit Parts Method equipment 10. Single TONE Adj item: 1) Adj item: [Single Deviation [Panel tun- Write the value 1.50kHz±0.05kHz Deviation ad- [TONE] Tone Deviation meter ing mode]...
Page 52 NX-720H(G)/720H ADJUSTMENT  3 Necessary Deviation adjustment item for each signaling and mode The following shows the necessary adjustment items for each signaling deviation. Please read the following table like the following example. In the case of the signaling “QT (Wide 5k)”, this signaling is composed of three elements [Balance, Maximum Deviation (Analog Wide 5k) and QT Deviation (Wide 5k)].
Page 53 NX-720H(G)/720H ADJUSTMENT Receiver Section Measurement Adjustment Speciﬁ cations/ Test- Item Panel test mode PC test mode Remarks equip- Unit Terminal Unit Parts Method ment 1.AF level setting [Panel test mode] 1) Test Channel [Panel Volume Up/Down 2.83V±0.3V 1) CH-Sig: 1-1 Channel: 1 Ext.SP Knob to obtain...
Page 54 NX-720H(G)/720H ADJUSTMENT Measurement Adjustment Speciﬁ cations/ Test- Item Panel test mode PC test mode Remarks equip- Unit Terminal Unit Parts Method ment This adjustment can 　　 5.Squelch 1) Adj item: [PC test Write the value as (Squelch level be performed only [Open Squelch Distortion Ext.SP con-...
Page 55 NX-720H(G)/720H ADJUSTMENT Measurement Adjustment Speciﬁ cations/ Test- Item Panel test mode PC test mode Remarks equip- Unit Terminal Unit Parts Method ment This adjustment can 8. Squelch(Tight) 1) Adj item: [Tight PC test Write the value as Ext.SP VHF,. [Analog Narrow] be performed only Squelch (Analog mode]...
Page 56: Terminal Function
NX-720H(G)/720H TERMINAL FUNCTION Display unit (X54-3830-10) TX-RX unit (X57-8230-10) Pin No. Name Function Pin No. Name Function CN1 (to TX-RX unit CN514) CN514 (to Disply unit CN1) Battery voltage DC supply Battery voltage DC supply Battery voltage DC supply Battery voltage DC supply SP–...
Page 57 NX-720H(G)/720H TERMINAL FUNCTION 8pin Modular Connector Speciﬁ cation Signal Description/port type Item and Condition Unit Note Name Type Digital CMOS output This parameter depends on Bat- Output Voltage tery voltage. Power Switched B output Output Current Ground CMOS input Digital (Pull Up : 5.0V/10k) -0.3 CMOS 3-State Buffer...
Page 58 NX-720H(G)/720H TERMINAL FUNCTION Signal Description Item and Condition Unit Note Name Type Output Level 0.28 Vp-p DETO FM detector output Coupling Capacitor  Allowable Load Analog Output Level 0.24 Vp-p RX Audio output Coupling Capacitor  Allowable Load Input Voltage Range 1.98- Vp-p Standerd deviation...
Page 59 NX-720H(G)/720H Signal Description Item and Condition Unit Note Name Type -0.5 FNC6 I/O Digital Programmable I/O VOH(Io=-1.5mA) VOL(Io=1.5mA) Output Voltage 5.25 50MC Power 5V DC Power supply Output Current Input Voltage Analog Horn alert signal input Input Current Rds (ON) m...
Page 60: Pc Board
NX-720H(G)/720H PC BOARD DISPLAY UNIT (X54-3830-10) Component side view (J79-0345-09) DISPLAY UNIT (X54-3830-10) Foil side view (J79-0345-09)
Page 61 NX-720H(G)/720H PC BOARD DISPLAY UNIT (X54-3830-10) Component side view (J79-0345-09) Ref. No. Address Component side Layer 1 Layer 2 Foil side J79-0345-09 DISPLAY UNIT (X54-3830-10) Foil side view (J79-0345-09) Ref. No. Address Component side Layer 1 Layer 2 Foil side...
Page 62: Tx-Rx Unit (X57-8230-1X)
NX-720H(G)/720H PC BOARD TX-RX UNIT (X57-8230-1X) Component side view (J79-0343-09) J501 J701 EXT.SP CN804 C815 L806 C816 CN720 R821 R641 R643 F501 CN802 IC801 R637 R835 R844 R674 C660 R639 R673 R638 C646 CN803 C645 D601 A801 Q504 C633 C403 C422 C427 C429...
Page 63 NX-720H(G)/720H PC BOARD TX-RX UNIT (X57-8230-1X) Component side view (J79-0343-09) Ref. No. Address Ref. No. Address Q702 Q703 IC103 Q704 IC102 IC201 Q705 IC303 Q706 IC402 Q708 IC404 Q709 IC409 IC509 D101 IC511 D102 IC512 D110 IC515 D202 C125 R120 IC701 D203 L108...
Page 64 NX-720H(G)/720H PC BOARD TX-RX UNIT (X57-8230-1X) Foil side view (J79-0343-09) Ref. No. Address Ref. No. Address Q502 IC301 Q503 IC304 IC401 IC405 R171 L114 IC406 IC407 IC408 R139 IC501 IC502 C163 IC503 IC504 IC506 IC507 R148 C158 IC508 R142 IC513 R154 IC514 C191...
Page 65 NX-720H(G)/720H PC BOARD TX-RX UNIT (X57-8230-1X) Foil side view (J79-0343-09) C632 Q502 R822 D705 D706 R667 R405 R406 C413 C788 C471 Q403 Q401 C409 C430 C434 C119 C121 L130 L104 L106 C433 C628 C629 R103 C118 IC516 C437 C457 R425 C438 R438 L805...
Page 66: Interconnection Diagram
NX-720H(G)/720H INTERCONNECTION DIAGRAM OUT1 POWERGND OUT2 FILTER PREGND RFINPUT GATEBIAS DRAINBIAS RFOUTPUT 1-42 B38-0936-05...
Page 67: Schematic Diagram
NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT(X57-8230-10) B-BUS CN423 R:13.6V T:13.0V DC/DC Converter(50M) D407 13.6V DC/DC BATTERY Converter(50M) CN422 SHDN 5.02V D407 RB520SM-30 L404 BooST Surge Reverse Protection Current Prevention IC405 L405 LT1616ES6-PBF 22uH D406 DC/DC Converter AVR(33A) CN421 AVR(33M) 4.98V R418 3.3V VoUT R410...
Page 68 NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT (X57-8230-10) B-BUS B-BUS FSX0 CLKX0 A-BUS A-BUS D-BUS D-BUS C-BUS C-BUS R526 100k CP513 100kX4 CP507 100kX4 CN541 CN542 CP514 C533 15MDSP 100kX2 CN502 CLKoUT DGND CN503 D[15] CN540 D[15] 33MDSP D[14] D[14] D[13] GPIo0 D[13] D[12] GPIo1...
Page 69 NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT (X57-8230-10) B-BUS B-BUS FSX0 FSX0 CLKX0 CLKX0 A-BUS D-BUS C-BUS L506 IC506 (MCLK) C542 18.432MHz 3.3V R555 0.01u INHN SM5023CNDH-G Buffer AMP(Clock) R556 A4 XTALI XTALo DSPCK GPSDET /HINT USRCKI A[0] ADD0 A[1] ADD1 A[2] ADD2 A[3] ADD3...
Page 70 NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT (X57-8230-10) B-BUS B-BUS FSX0 CLKX0 C543 0.1u IC508 TC7SH08FU-F 18.423MHz X501 AND Gate L77-3015-05 R568 IC301 TC7SH08FU-F R567 BSHIFT oUTPUT R569 oUTY AND Gate CN523 oUTY C706 R707 MIC2 1.8k 0.1u C718 DGND2 0.1u DGND1 0.1u C565 IC701...
Page 71 NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT (X57-8230-10) B-BUS AF AMP Q703,704 Q704 D703 MIC AGC 2SC4738(GR)F D703,704 IC714 DA3S101F R775 AF Detector 5.6k 6.5V 1.44V 6.3V Bias R823 C806 SPAF MIC2 Bias 1.44V D704 DA3S101F R819 C797 R777 2.2k 0.22u R811 Q703 C791 C796...
Page 72 NX-720H(G)/720H SCHEMATIC DIAGRAM ✽ 1 X57-823X-XX A801 CN801 C809 C814 C815 C816 C820 C821 C822 C823 C824 C825 C826 L802 R561 R802 R835 R839 R842 R843 R844 IC801 D801 D802 L801 L805 L806 0-10 NX-720H(G) K 0-11 NX-720H TX-RX UNIT (X57-8230-10) ✽...
Page 73 NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT (X57-8230-10) THP1 THP1 /T_R /T_R TEMP 3.31V 100p 0.01u 0.01u GND1 CPout NC_1 GND2 oUTPUT NC_2 VCCcp NC_3 LD/PS L77-3073-05 SKY72310-362 NC_4 100p 0.1u 4.7u PLL System 0.01u NC_5 NC_6 100p AVR(33C) 3.3V IC409 NJM2878F4-33 0.1u R825 Over Voltage...
Page 74 NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT (X57-8230-10) THP1 /T_R R:4.61V T:4.62V 100p R:2.9V Buffer AMP THP1 2SC5108(Y)F T:2.82V (PLL Fin) R:2.7V T:2.49V PLL f-in BPF Tune PLL f-in BPF Tune R:4.00V T:0V R:3.56V 1.8k RX VCO Buffer AMP T:3.76V R:1.56V RX VCO R:3.79V RKS151KJ RX VCO Assist Tune...
Page 75 NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT (X57-8230-10) CN10 CN11 CN14 TX Power Module IC102 CN12 CN13 25℃ : 2.6V RA60H1317M1-123 THP1 L105 D110 R:13.6V L407CDB 15dBm T:13.0V(45W) D110,111 C177 L104 R:0.03V R122 Antenna Switch T:3.22V (36dBm:5W) Drive:2.6dBm 100p D111 L106 L407CDB C119 C121 39n (-92)
Page 76 NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT (X57-8230-10) COUPPLER Forward Power R171 L117 Reverse Power CN514 C621 1000p LCDCS D104,105 C620 100p SCK0 TX Power Detection SDO0 C618 100p Over Voltage Protection C617 100p CP515 RLED D106 100p C616 DZ2J056(M) 100X2 GLED C165 C158 C615...
Page 77 NX-720H(G)/720H SCHEMATIC DIAGRAM DISPLAY UNIT (X54-3830-10) D11-21,24 LCD BACKLIGHT D1 9 R 3 4 2.07V D 2 1 R 3 6 R 29 2 2 0 27 0 1 2 0 B30-2337-05 K T C 4 0 7 5E ( Y , G R ) LCD BACKLIGHT SWITCH D5-9...
Page 78: Block Diagram
NX-720H(G)/720H BLOCK DIAGRAM TX-RX UNIT (X57-8230-10) X501 L77-3015-05 IC506 SM5023CNDH-G VCTCXO BUFF 18.432MHz /PCS_DSP PSCK_DSP PLL MOD SKY72310-362 IC501 IC503 16.8MHz TCXO Flash SRAM IC502 SD01 PLL MOD /DRST,/HDS2,/HRDY, IC508 /SYMTIM,/DINT,FSDET, /PCS_DSP TC7SH08FU-F /HINT,/DWUP /PCS_RF /PCS SCK1 MCDIAF,/MCSCKAF,/MCCSAF, P_SCK1 MCDOAF,MCDICN,/MCCSXCN, HOST_RDY,DSP_ST,MCSCKCN IC301 PSCK_DSP...
Page 79 NX-720H(G)/720H BLOCK DIAGRAM Q4 2SC5383-T111 D14 DA2S101 Lippple 50CS Filter 136-174 MHz Q8 EM6M1 Q9 SSM3J15FS /T_R Q102 IC102 D16,17 D110,111 L407CDB 2SC5108(Y)F 2SC3357-A RA60H1317M1A SKY72310-362 RKS151KJ*2 D107 RKP351KW-1P2 TX: 136 - 174MHz Loop BUFF DRIVE FINAL BUFF Filter D104 2SC5108(Y)F IC3(1/2) HSM88AS-E...
Page 80 NX-720H(G)/720H BLOCK DIAGRAM 30pin FLAT CABLE Connector (TO TX-RX UNIT) 8pin MODULAR JACK KMI1 KMI2 KMI3...
Page 81: Level Diagram
NX-720H(G)/720H LEVEL DIAGRAM Receiver Section RF (Center Frequency) IF1 (49.95MHz) IF2 (450kHz) –119.5dBm –120.0dBm –114.5dBm –121.0dBm –107.0dBm -62.0dBm IF Amp FM IC ASIC Mixer C262 C254 C216 C361 C347 C343 Q201 IC303 IC507 Q305 Q202 AF (1kHz) 186.2mVrms 186.2mVrms 226.1mVrms 101.2mVrms 21.46mVrms Audio Amp...
Page 82: Optional Accessories
NX-720H(G)/720H OPTIONAL ACCESSORIES KRA-40 (GPS ACTIVE ANTENNA) Speciﬁ cations ■ Supply Voltage ............3.0±0.3V Current Consumption ...........Typ. 19mA Center Frequency ..........1575.42MHz Gain ..........30±7dBi (Elevation : 90°) ............23±7dBi (Elevation : 10°) Output Impedance ............50 External View ■...
Page 83 NX-720H(G)/720H MEMO...
Page 84: Specifications
Analog @12.5kHz: 45dB Modulation ..........16K0F3E, 14K4F1D, 11K0F3E, 8K30F1E, 8K30F1D, 8K30F7W, 4K00F1E, 4K00F1D, 4K00F7W, 4K00F2D Analog measurements made per TIA/EIA 603 and speciﬁ cations shown are typical. JVC KENWOOD Corporation reserves the right to change speciﬁ cations without prior notice or obligation.
Page 85 NX-720H(G)/720H NX-720H(G)/720H PC BOARD PC BOARD DISPLAY UNIT (X54-3830-10) Component side view (J79-0345-09) DISPLAY UNIT (X54-3830-10) Component side view (J79-0345-09) Ref. No. Address Component side Layer 1 Layer 2 Foil side J79-0345-09 DISPLAY UNIT (X54-3830-10) Foil side view (J79-0345-09) DISPLAY UNIT (X54-3830-10) Foil side view (J79-0345-09) Ref.
Page 86 NX-720H(G)/720H NX-720H(G)/720H PC BOARD PC BOARD TX-RX UNIT (X57-8230-1X) TX-RX UNIT (X57-8230-1X) Component side view (J79-0343-09) Component side view (J79-0343-09) J501 J701 Ref. No. Address Ref. No. Address EXT.SP Q702 Q703 IC103 Q704 IC102 IC201 Q705 IC303 Q706 CN804 C815 L806 IC402 Q708...
Page 87 NX-720H(G)/720H NX-720H(G)/720H PC BOARD PC BOARD TX-RX UNIT (X57-8230-1X) TX-RX UNIT (X57-8230-1X) Foil side view (J79-0343-09) Foil side view (J79-0343-09) Ref. No. Address Ref. No. Address Q502 C632 IC301 Q503 IC304 IC401 Q502 IC405 L114 R171 IC406 IC407 IC408 R139 IC501 R822 IC502...
Page 88 TX-RX UNIT(X57-8230-10) DISPLAY UNIT (X54-3830-10) ✽ 1 X57-823X-XX A801 CN801 C809 C814 C815 C816 C820 C821 C822 C823 C824 C825 C826 L802 R802 R835 R839 R842 R843 R844 IC801 B-BUS B-BUS B-BUS B-BUS B-BUS B-BUS B-BUS B-BUS 0-10 NX-720H(G) K D801 D802 L801 L805 L806...
Page 89 TX-RX UNIT (X57-8230-10) Q4 2SC5383-T111 D14 DA2S101 X501 Lippple L77-3015-05 IC506 50CS Filter 136-174 MHz Q8 EM6M1 SM5023CNDH-G VCTCXO Q9 SSM3J15FS BUFF /T_R 18.432MHz /PCS_DSP Q102 IC102 D16,17 D110,111 L407CDB PSCK_DSP 2SC5108(Y)F 2SC3357-A RA60H1317M1A PLL MOD SKY72310-362 RKS151KJ*2 D107 RKP351KW-1P2 TX: 136 - 174MHz IC501 IC503...

This manual is also suitable for:

Nx-720h

Kenwood NX-720H(G) Service Manual

Quick Links

Related Manuals for Kenwood NX-720H(G)

Summary of Contents for Kenwood NX-720H(G)

This manual is also suitable for:

Table of Contents