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JVC KENWOOD NX-720H Service Manual

Vhf digital transceiver
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VHF DIGITAL TRANSCEIVER
NX-720H(G)/720H
SERVICE MANUAL
REVISED
Modular jack
(E58-0535-05)
GENERAL ....................................................2
SYSTEM SET-UP .........................................4
REALIGNMENT ...........................................4
INSTALLATION ............................................7
DISASSEMBLY FOR REPAIR .....................9
CIRCUIT DESCRIPTION ...........................11
COMPONENTS DESCRIPTION ................17
PARTS LIST ...............................................19
EXPLODED VIEW ......................................29
PACKING ...................................................30
TROUBLE SHOOTING ..............................31
ADJUSTMENT ...........................................35
This product complies with the RoHS directive for the European market.
Key top
(K29-9479-01)
CONTENTS
TERMINAL FUNCTION .............................56
DISPLAY UNIT (X54-3830-10) ...............60
TX-RX UNIT (X57-8230-1X)....................62
INTERCONNECTION DIAGRAM ...............66
SCHEMATIC DIAGRAM ............................67
BLOCK DIAGRAM .....................................78
LEVEL DIAGRAM ......................................81
KRA-40 ...................................................82
SPECIFICATIONS .................. BACK COVER
© 2012-12 PRINTED IN JA PAN
B53-7032-10 ( Y )
Panel assy
Badge
(A62-1200-03)
(B43-1675-04)
This product uses Lead Free solder.

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  • Page 1: Table Of Contents

    VHF DIGITAL TRANSCEIVER NX-720H(G)/720H SERVICE MANUAL REVISED © 2012-12 PRINTED IN JA PAN B53-7032-10 ( Y ) Key top Modular jack Panel assy Badge (E58-0535-05) (K29-9479-01) (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...

  • Page 2: General

    KENWOOD product memories. 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...
  • Page 3 NX-720H(G)/720H GENERAL 3-3. Radio 4-2. Radio location The universal mount bracket allows the radio to be Select a convenient location for your control station radio mounted in a variety of ways. Be sure the mounting surface which is as close as practical to the antenna cable entry is adequate to support the radio’s weight.

  • 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 Transceiver programming See page 4. KRA-40 GPS active antenna A personal computer, programming interface (KPG-46A/46U), and FPU (programming software) are required for programming.
  • Page 5 NX-720H(G)/720H REALIGNMENT 5-2. Connection procedure 1. Connect the transceiver to the computer using the inter- KPG-46A or KPG-46U face cable. Tuning cable (E30-3383-05) Note: • You must install the KPG-46U driver in the computer to use the USB programming interface cable (KPG-46U).
  • Page 6 NX-720H(G)/720H REALIGNMENT 6-4. Function displayed, numbers (0 to 9) are displayed fl ashing. When you press the [ ] key, the currently selected number is If you press the [ key while “FIRM PRG” is displayed, determined. If you press the [ ] key after entering the the checksum is calculated, and a result is displayed.If you...

  • Page 7: Installation

    NX-720H(G)/720H INSTALLATION 1. Connection Cable (KCT-60: Option) 2-1. Installation Procedure 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 4. External Speaker (Option) Remove the R664, R635, R662, R659, R658 and R632 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 1. Disassembly Procedure 3. Disconnect the fl at cable from connector of the panel as- 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.

  • 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...
  • Page 12 NX-720H(G)/720H CIRCUIT DESCRIPTION 3-3. Audio amplifi er circuit 4-1. Audio Band Circuit Audio processing (high-pass filter, low-pass filter, de- The signal from the microphone is amplifi ed by IC703 (1/2) emphasized and so on) in FM mode and decoding in NXDN and limited by the AGC circuit composed of D703, D704, mode are processed by the DSP (IC502).
  • Page 13 NX-720H(G)/720H CIRCUIT DESCRIPTION 5. PLL Frequency Synthesizer 5-3. PLL IC (IC2) 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. Control Circuit 6-5. DSP The DSP circuit consists of a DSP (IC502) and process- The control circuit consists of the ASIC (IC507) and its es the baseband signal. The DSP operates on an external peripheral circuits. IC507 mainly performs the following: clock of 18.432MHz (the same as the IC507), the I/O section...
  • Page 15 NX-720H(G)/720H CIRCUIT DESCRIPTION Fig. 7 Power supply circuit...
  • Page 16 NX-720H(G)/720H CIRCUIT DESCRIPTION 8. Signaling Circuit 8-1. Encode (QT/DQT/DTMF/2-tone/MSK) Each signaling data signal of the QT, DQT, DTMF, 2-tone 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, 2-tone 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 (X57-8230-1X) 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...
  • Page 18 NX-720H(G)/720H COMPONENTS DESCRIPTION Ref. No. Part Name Description Ref. No. Part Name Description Variable capaci- Transistor DC switch (Assist) RX VCO frequency control tance diode DC switch (Assist) Variable capaci- TX VCO frequency control tance diode Transistor Ripple fi lter...

  • Page 19: Parts List

    Les articles non mentionnes dans le Parts No. ne sont pas fournis. C : China X : Australia M : Oth er Areas Teile ohne Parts No. werden nicht geliefert. NX-720H(G) / 720H DISPLAY UNIT (X54-3830-10) Desti- Desti- Ref. No. Ad dress Parts No.
  • 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 R38 -40 RK73HB1J472J CHIP R 4.7K 1/16W CC73HCH1H040B CHIP C 4.0PF...
  • 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 C293 CK73HB1H471K CHIP C 470PF C157 CK73HB1H102K CHIP C 1000PF C306 CK73HB1E103K CHIP C 0.010UF...
  • 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 C436 CK73HB1H103K CHIP C 0.010UF C559 CK73FB1A106K CHIP C 10UF C437 CK73FB1E475K CHIP C 4.7UF...
  • 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 C735 CK73GB0J106K CHIP C 10UF J701 E11-0425-05 3.5D PHONE JACK(EXT-SP) C738 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 L221 L40-5663-71 SMALL FIXED INDUCTOR(5.6NH) RK73HB1J184J CHIP R 180K 1/16W L232,233 L41-3978-14 SMALL FIXED INDUCTOR(39NH)
  • 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 R341 RK73HB1J103J CHIP R 1/16W R147 RK73HB1J124J CHIP R 120K 1/16W R342 RK73HB1J104J CHIP R...
  • 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 R524 RK73HB1J000J CHIP R 1/16W R669-671 RK73HB1J101J CHIP R 1/16W R525 RK73HB1J474J CHIP R...
  • 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 R801 RK73HB1J102J CHIP R 1.0K 1/16W D601 DB2S310 DIODE R801,802 RK73HB1J102J CHIP R 1.0K...
  • 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 Q303 2SC5108(Y)F TRANSISTOR Q305 2SC4215-F(Y) TRANSISTOR Q401 LTC014EEBFS8 TRANSISTOR Q402 2SA1955A-F TRANSISTOR Q403 MTM981400BF...

  • Page 29: Exploded View

    NX-720H(G)/720H EXPLODED VIEW : N30-2605-48(M2.6x5) (M3x8) : N67-3008-48 : N87-2608-48(Ø2.6x8) J501 J701 IC102 IC714 TX-RX unit Cx13 R171 (H type) (HG type) Display unit 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)

  • 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.
  • 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...
  • Page 33 KRA-40 is defective. Replacing TX-RX Unit ■ TX-RX unit Information Model Name Frequency Range [MHz] Original TX-RX unit Number For Service TX-RX unit Number NX-720H(G) (GPS model): K 136 - 174 X57-8230-10 X57-8230-12 NX-720H: K 136 - 174 X57-8230-11 X57-8230-13...
  • Page 34 NX-720H(G)/720H TROUBLE SHOOTING ■ Method of confi rming “Original TX-RX unit” and AFTER CHANGING THE PCB 1. After changing the printed circuit board, write the up-to- “Service TX-RX unit” date Firmware following the instructions in the service manual. SUPPLIED ACCESSORIES •...

  • Page 35: Adjustment

    NX-720H(G)/720H ADJUSTMENT Controls ■ Key operation “ ” 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...
  • 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 • NXDN mode signaling ■ Key operation Function RAN1 RAN1 Push Hold (1 second) None [ ]/[ ] Adjustment value up/down 20Hz/2kHz (During transmis- RAN1 Maximum Deviation Pattern sion in balance adjustment) FSW+PN9 (PC test mode None only)
  • 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.
  • Page 39 NX-720H(G)/720H ADJUSTMENT ■ Adjustment item and Adjustment range NV (NXDN Very Adjustment 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...
  • Page 40 NX-720H(G)/720H ADJUSTMENT NV (NXDN Very Adjustment 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 ✓ ✓...
  • Page 41 NX-720H(G)/720H ADJUSTMENT ] hold Analog MAX Deviation Analog MAX Deviation Narrow Wide ADEV ADEV ] press ] hold 5 reference level Adjustments QT Deviation QT Deviation Narrow Wide ] press ] hold DQT Deviation DQT Deviation Narrow Wide ] press...
  • 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 Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel test mode PC test mode Unit Terminal Unit Parts Method equipment 1. Frequency 1) CH-Sig : 1-1 1) Test Channel f. counter Check an internal +/-0.25ppm...
  • Page 44 NX-720H(G)/720H ADJUSTMENT Common Section Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 1. Setting 1) DC voltage: 13.6V 2) SSG standard modulation [Wide] MOD: 1kHz, DEV: 3kHz [Narrow] MOD: 1kHz, DEV: 1.5kHz This adjustment...
  • Page 45 NX-720H(G)/720H ADJUSTMENT Transmitter Section Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 1. High 1) Adj item: [HLMT] 1) TEST CH: Power [Panel 53.0W ±2.0W Transmit Adjust: [] Low, Low’, Center,...
  • Page 46 NX-720H(G)/720H ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 2. Mid 1) Adj item: [MPWR] 1) TEST CH: Power [Panel 30.0W ±1.0W Adjust: [] Low, Low’, Center,...
  • Page 47 NX-720H(G)/720H ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 4. Maximum 1) Adj item: [NDEV] 1) Adj item: [Maximum Deviation Write Reference 1311~1363Hz [Panel Deviation Adjust: []...
  • Page 48 NX-720H(G)/720H ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 7. DQT 1) Adj item: [DQT] 1) Adj item: [DQT Deviation [Panel Write the value 0.35kHz±0.05kHz Deviation Adjust: [.]...
  • Page 49 NX-720H(G)/720H ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 10. Single 1) Adj item: [TONE] 1) Adj item: [Single Deviation [Panel Write the value 1.50kHz±0.05kHz TONE Adjust: [.]...
  • Page 50 NX-720H(G)/720H ADJUSTMENT ■ 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)”, this signaling is composed of three elements [Balance, Maximum Deviation (Analog Wide) and QT Deviation (Wide)].
  • Page 51 NX-720H(G)/720H ADJUSTMENT Receiver Section Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 1. AF level [Panel test mode] 1) Test Channel [Panel Volume Up/Down 2.83V±0.3V setting 1) CH-Sig: 1-1 Channel: 1 Ext.SP...
  • Page 52 NX-720H(G)/720H ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 4. RSSI 1) Adj item: [RRSS] 1) Adj item: [Panel tuning mode] reference Adjust: [] [RSSI Reference AF VM Ext.SP...
  • Page 53 NX-720H(G)/720H ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 5. Open 1) Adj item: [SQL] 1) Adj item: [Panel tuning mode] “Open Squelch” Squelch *6 Adjust: []...
  • Page 54 NX-720H(G)/720H ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 6. Low RSSI 1) Adj item: [LRSS] 1) Adj item: [Panel tuning Adjust with the ana- at -118dBm Adjust: []...
  • Page 55 NX-720H(G)/720H ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 8. Squelch 1) Adj item: [SQLT] 1) Adj item: [Panel tuning mode] “Squelch (Tight)” (Tight) Adjust: [] [Tight Squelch AF VM Ext.SP...

  • Page 56: Terminal Function

    NX-720H(G)/720H TERMINAL FUNCTION Display unit (X54-3830-10) TX-RX unit (X57-8230-1X) Pin No. Name Function Pin No. Name Function CN1 (to TX-RX unit CN514) CN514 (to Display 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 Allowable Current Value...
  • 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...
  • Page 59 NX-720H(G)/720H TERMINAL FUNCTION 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) POWER HOOK 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 R674 R844 C660 R639 R673 R638 C646 CN803 C645 D601 A801 Q504 C633 C403...
  • 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...
  • 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 L114 R171 IC406 IC407 IC408 R139 IC501 IC502 C163 IC503 IC504 IC506 IC507 R148 C158 IC508 R142 IC513...
  • 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 C433 L104 L106 C628 C629 R103 C118 IC516 C437 C457 R425...

  • 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(X57-8230-1X) B-BUS CN423 R:13.6V T:13.0V DC/DC Converter(50M) D407 13.6V BATTERY DC/DC 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...
  • Page 68 NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT (X57-8230-1X) 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...
  • Page 69 NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT (X57-8230-1X) 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]...
  • Page 70 NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT (X57-8230-1X) 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 C565 0.1u...
  • Page 71 NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT (X57-8230-1X) 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 C797 R819 R777 2.2k 0.22u R811...
  • Page 72 C816 C820 C821 C822 C823 C824 C825 C826 D801 D802 L801 L802 L805 L806 R561 R802 R835 R839 R842 R843 R844 IC801 0-10 NX-720H(G) K 0-11 NX-720H TX-RX UNIT (X57-8230-1X ✽ 1 R561 GPSDET B-BUS Dual BUS Buffer IC801 TC7WH126FU-F...
  • Page 73 NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT (X57-8230-1X) THP1 THP1 /T_R /T_R TEMP 3.31V 100p 0.01u 0.01u GND1 NC_1 CPout 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 0.1u...
  • Page 74 NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT (X57-8230-1X) THP1 /T_R R:4.61V T:4.62V 100p R:2.9V Buffer AMP 2SC5108(Y)F THP1 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 RX VCO 1.8k Buffer AMP T:3.76V R:1.56V RX VCO R:3.79V...
  • Page 75 NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT (X57-8230-1X) CN10 CN11 CN14 TX Power Module IC102 CN12 CN13 25℃ : 2.6V RA60H1317M1A THP1 L105 D110 R:13.6V L407CDB 15dBm T:13.0V(50W) D110,111 C177 L104 R:0.03V R122 Antenna Switch T:3.22V (36dBm:5W) Drive:2.6dBm 100p D111 L106 C119 39n (-92)
  • Page 76 NX-720H(G)/720H SCHEMATIC DIAGRAM TX-RX UNIT (X57-8230-1X) 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...
  • Page 77 NX-720H(G)/720H SCHEMATIC DIAGRAM DISPLAY UNIT (X54-3830-10) D11-21,24 LCD BACKLIGHT R 3 4 2.07V D 2 1 R 3 6 R 2 9 2 2 0 2 70 1 20 B30-2337-05 K T C4 07 5 E(Y ,G R ) LCD BACKLIGHT...

  • Page 78: Block Diagram

    NX-720H(G)/720H BLOCK DIAGRAM TX-RX UNIT (X57-8230-1X) 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,...
  • Page 79 NX-720H(G)/720H BLOCK DIAGRAM Q4 2SC5383-T111 D14 DA2S101 Ripple 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...
  • 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...

  • Page 82: Optional Accessories

    NX-720H(G)/720H OPTIONAL ACCESSORIES KRA-40 (GPS ACTIVE ANTENNA) Specifi cations ■ Operating Temperature ..–22°F ~ +185°F (–30°C ~ +85°C) Water Performance ............IPx7 Center Frequency ..........1575.42MHz Output Impedance ............50 Dimensions (Cable not included) ....1.30 x 1.42 x 0.50 in (33 x 36 x 12.8 mm) Cable length ............Approx.
  • Page 83 NX-720H(G)/720H MEMO...

  • Page 84: Specifications

    Analog @12.5kHz: 45dB Modulation ..........16K0F3E, 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 POWER HOOK 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...
  • 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...
  • Page 88 C824 C825 C826 D801 D802 L801 L802 L805 L806 R561 R802 R835 R839 R842 R843 R844 IC801 FSX0 FSX0 FSX0 FSX0 0-10 0-11 NX-720H(G) K NX-720H D 11-21,24 CLKX0 CLKX0 CLKX0 CLKX0 LCD BACKLIGHT A-BUS D-BUS A-BUS D-BUS A-BUS D-BUS...
  • Page 89 TX-RX UNIT (X57-8230-1X) Q4 2SC5383-T111 D14 DA2S101 X501 Ripple L77-3015-05 IC506 50CS Filter 136-174 MHz Q8 EM6M1 SM5023CNDH-G VCTCXO Q9 SSM3J15FS BUFF 18.432MHz /T_R /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...

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Nx-720hg

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