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JVC KENWOOD NX-820 User Manual

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UHF DIGITAL TRANSCEIVER
NX-820(G)/820
SERVICE MANUAL
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
TROUBLE SHOOTING ..............................30
ADJUSTMENT ...........................................34
This product complies with the
RoHS
Key top
(K29-9479-01)
CONTENTS
directive for the European market.
© 2012-11 PRINTED IN JA PAN
B53-7044-00 ( Y ) 80
Panel assy
(A62-1200-03)
TERMINAL FUNCTION .............................56
DISPLAY UNIT (X54-3830-10) ...............60
TX-RX UNIT (X57-8240-1X)....................62
INTERCONNECTION DIAGRAM ...............66
SCHEMATIC DIAGRAM ............................67
BLOCK DIAGRAM .....................................78
LEVEL DIAGRAM ......................................81
KRA-40 ..................................................82
SPECIFICATIONS ......................................83
Badge
(B43-1675-04)
This product uses Lead Free solder.

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  • Page 1: Table Of Contents

    UHF DIGITAL TRANSCEIVER NX-820(G)/820 SERVICE MANUAL © 2012-11 PRINTED IN JA PAN B53-7044-00 ( Y ) 80 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-820(G)/820 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

    Choose the type of transceiver NX-820(G)/820 400~470 See page 4. Transceiver programming A personal computer, programming interface (KPG-46A/46U), and FPU (programming software) are required for programming. (Option: NX-820(G) only) KRA-40 GPS active antenna KCT-60 (Option) Connection cable See page 7. (Option) *Only when required.
  • Page 5 NX-820(G)/820 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-820(G)/820 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-820(G)/820 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-820(G)/820 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-820(G)/820 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-820(G)/820 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-820(G)/820 CIRCUIT DESCRIPTION 1. Overview 3. Receiver System The NX-820 is a UHF Mobile transceiver designed to 3-1. RF circuit operate in the frequency range of 400 to 470MHz. The unit An incoming RF signal from the antenna terminal is...
  • Page 12 NX-820(G)/820 CIRCUIT DESCRIPTION 3-3. Audio amplifi er circuit 4-2. Base Band Circuit Audio processing (high-pass filter, low-pass filter, de- The audio signal output from the Audio band circuit is emphasized and so on) in FM mode and decoding in NXDN converted to digital data with a sampling frequency of 48 mode are processed by the DSP (IC502).
  • Page 13 NX-820(G)/820 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-820(G)/820 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 pe- es the base band signal. The DSP operates on an external ripheral circuits.
  • Page 15 NX-820(G)/820 CIRCUIT DESCRIPTION Fig. 7 Power supply circuit...
  • Page 16 NX-820(G)/820 CIRCUIT DESCRIPTION 8. Signaling Circuit 8-1. Encode (QT/DQT/DTMF/2-tone/5-tone/MSK) Each signaling data signal of the QT, DQT, DTMF, 2-tone, 5-tone and MSK is generated by the DSP circuit, super- posed on a modulation signal and output from the ASIC (IC507). Each deviation of the TX QT, DQT, DTMF, 2-tone,...

  • Page 17: Components Description

    NX-820(G)/820 COMPONENTS DESCRIPTION Display unit (X54-3830-10) TX-RX unit (X57-8240-1X) 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-820(G)/820 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

    CHIP R 1/16W X57-8240-16 TX-RX UNIT(FOR SERVICE) R24 ,25 RK73HB1J332J CHIP R 3.3K 1/16W X57-8240-17 TX-RX UNIT(FOR SERVICE) RK73HB1J472J CHIP R 4.7K 1/16W RK73FB2B121J CHIP R 1/8W RK73FB2B221J CHIP R 1/8W R34 -37 RK73GB2A271J CHIP R 1/10W GE: NX-820(G) E: NX-820...
  • Page 20 CK73HB1H471K CHIP C 470PF C161 CC73GCH1H040C CHIP C 4.0PF CC73HCH1H240G CHIP C 24PF C165 CK73HB1H471K CHIP C 470PF CC73HCH1H0R5B CHIP C 0.5PF C167 CC73GCH1H040C CHIP C 4.0PF CK73FB1A106K CHIP C 10UF C168 CK73HB1H471K CHIP C 470PF GE: NX-820(G) E: NX-820...
  • Page 21 0.10UF C291 CC73HCH1H020B CHIP C 2.0PF C429 CK73HB1H471K CHIP C 470PF C292 CC73HCH1H080B CHIP C 8.0PF C293 CK73HB1H471K CHIP C 470PF C430 CK73FB1E475K CHIP C 4.7UF C431 CC73HCH1H101J CHIP C 100PF C294 CC73HCH1H100B CHIP C 10PF GE: NX-820(G) E: NX-820...
  • Page 22 0.010UF C722 CK73HB1A104K CHIP C 0.10UF C549 CK73HB1A104K CHIP C 0.10UF C723 CC73HCH1H470J CHIP C 47PF C551 CK73HB1A104K CHIP C 0.10UF C725 CC73HCH1H121J CHIP C 120PF C552 CK73HB1H103K CHIP C 0.010UF C728 CK73HB1H821K CHIP C 820PF GE: NX-820(G) E: NX-820...
  • Page 23 0.10UF L206 L40-4775-71 SMALL FIXED INDUCTOR(47NH) C829 CK73GB0J106K CHIP C 10UF L207-209 L41-3378-14 SMALL FIXED INDUCTOR(33NH) C830,831 CK73HB1A104K CHIP C 0.10UF L210 L41-8278-14 SMALL FIXED INDUCTOR(82NH) C832,833 CK73HB1H102K CHIP C 1000PF L211 L41-3378-14 SMALL FIXED INDUCTOR(33NH) GE: NX-820(G) E: NX-820...
  • Page 24 100K 1/16W R136 RK73GB2A151J CHIP R 1/10W RK73HB1J102J CHIP R 1.0K 1/16W R137 RK73HB1J104J CHIP R 100K 1/16W R138 RK73HB1J103J CHIP R 1/16W RK73HB1J103J CHIP R 1/16W RK73HB1J106J CHIP R 1/16W R139,140 RK73GB2A151J CHIP R 1/10W GE: NX-820(G) E: NX-820...
  • Page 25 RK73HB1J272J CHIP R 2.7K 1/16W R323 RK73HB1J000J CHIP R 1/16W R501 RK73HB1J220J CHIP R 1/16W R324 RK73HB1J183J CHIP R 1/16W R503,504 RK73HB1J104J CHIP R 100K 1/16W R326 RK73GB2A331J CHIP R 1/10W R505,506 RK73GB2A000J CHIP R 1/10W GE: NX-820(G) E: NX-820...
  • Page 26 R773 RK73HB1J000J CHIP R 1/16W R639 RK73HB1J471J CHIP R 1/16W R775 RK73HB1J562J CHIP R 5.6K 1/16W R641 RK73GB2A000J CHIP R 1/10W R776,777 RK73HB1J103J CHIP R 1/16W R643 RK73GB2A000J CHIP R 1/10W R778 RK73HB1J273J CHIP R 1/16W GE: NX-820(G) E: NX-820...
  • Page 27 Q102 2SC3357-A TRANSISTOR GE: NX-820(G) If a part reference number is listed in a shaded box, that part does not come with the PCB. E: NX-820 Note 1: This part cannot be replaced. Therefore, this part is not supplied as a service part.
  • Page 28 Q504 LTC014TEBFS8 TRANSISTOR Q701 FK330301 Q702 KTC4075E(Y,GR) TRANSISTOR Q703 2SA1832(GR)F TRANSISTOR Q704 2SC4738(GR)F TRANSISTOR Q705,706 SSM3J15FS Q708 LTC014EEBFS8 TRANSISTOR Q709 SSM6N37FE ERTJ0EV104H THERMISTOR TH101 ERTJ0EV104H THERMISTOR TH103 ERTJ0EV104H THERMISTOR TH701 ERTJ0EV104H THERMISTOR A801 W02-3768-05 GPS MODULE GE: NX-820(G) E: NX-820...

  • Page 29: Exploded View

    NX-820(G)/820 EXPLODED VIEW : N30-2605-48(M2.6x5) : N67-3008-48(M3x8) : N87-2608-48(Ø2.6x8) J501 J701 IC102 IC714 TX-RX unit Cx13 R171 (W/O GPS type) (G 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: Trouble Shooting

    NX-820(G)/820 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 31 NX-820(G)/820 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 32 KRA-40 is defective. Replacing TX-RX Unit ■ TX-RX unit Information Frequency Range Original TX-RX unit For Service TX-RX unit Model Name [MHz] Number Number NX-820(G) (GPS model): E 400 - 470 X57-8240-12 X57-8240-16 NX-820: E 400 - 470 X57-8240-13 X57-8240-17...
  • Page 33 FPU Data justment data (PC Test mode) as described in the service X57-823: NX-720 Kx type data (PC programming manual. X57-824: NX-820 Kx type data mode) 4 Attach the new labels corresponding to the new printed Voice Language English circuit board. (Refer to the images below for label place- ment.)

  • Page 34: Adjustment

    NX-820(G)/820 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 35 NX-820(G)/820 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 36 NX-820(G)/820 ADJUSTMENT • NXDN mode signaling ■ Key operation Function RAN1 RAN1 Push Hold (1 second) None [ ]/[ ] Adjustment value up/down RAN1 Maximum Deviation Pattern 20Hz/2kHz (During transmis- sion in balance adjustment) FSW+PN9 (PC test mode None only)
  • Page 37 NX-820(G)/820 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 38 NX-820(G)/820 ADJUSTMENT ■ Adjustment item and Adjustment range NV (NXDN Very (Analog (Analog (Analog (NXDN Adjustment Panel Adjust item Narrow) Order Wide 5k) Wide 4k) Narrow) Narrow) item tuning test Number Adjustment range 9 point ADJ Common Receive Assist ✓...
  • Page 39 NX-820(G)/820 ADJUSTMENT NV (NXDN (Analog (Analog (Analog (NXDN Adjustment Panel Adjust item Very Narrow) Order Wide 5k) Wide 4k) Narrow) Narrow) item tuning test Number Adjustment range - *1 Receiver RSSI Reference ✓ ✓ Section 4 1~256 - *1 Receiver Open Squelch ✓...
  • Page 40 NX-820(G)/820 ADJUSTMENT ] hold LTR Deviation LTR Deviation Narrow Wide ] hold ] press Wide DTMF Deviation DTMF Deviation Wide DTMF Deviation Narrow DTMF DTMF DTMF ] press ] hold Wide Single Tone Deviation Single Tone Deviation Wide Single Tone Deviation...
  • Page 41 NX-820(G)/820 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 42 NX-820(G)/820 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 43 NX-820(G)/820 ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel test mode PC test mode Unit Terminal Unit Parts Method equipment 5. Sensitivity 1) CH-Sig: 1-1 1) Test Channel Check 12dB SINAD or check SSG output Channel: 1 AF VM Ext.SP...
  • Page 44 NX-820(G)/820 ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment ∗ The Frequency 4. Frequency 1) Adj item: [PC test mode] [PC test mode] adjustment can be [Frequency] Press [Start] but- The value of “IF20”...
  • Page 45 NX-820(G)/820 ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 2. High 1) Adj item: [HPWR] 1) TEST CH: Power [Panel 25.0W ±1.0W Transmit Adjust: [∗∗∗∗] Low, Low’, Center, meter 10.0A or less...
  • Page 46 NX-820(G)/820 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 [Panel Write Reference 1311~1363Hz Deviation Adjust: [∗∗∗∗]...
  • Page 47 NX-820(G)/820 ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 6. QT 1) Adj item: [QT] 1) Adj item: [QT Deviation [Panel Write the value 0.60kHz±0.05kHz Deviation Adjust: [∗∗∗.∗.]...
  • Page 48 NX-820(G)/820 ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 8. LTR 1) Adj item: [LTR] 1) Adj item: [LTR Deviation [Panel Write the value 0.75kHz±0.05kHz Deviation Adjust: [∗∗∗∗.]...
  • Page 49 NX-820(G)/820 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 2.40kHz±0.05kHz Tone Adjust: [∗∗∗.∗.]...
  • Page 50 NX-820(G)/820 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 5k/Wide 4k)”, this signaling is composed of three elements [Balance, Maximum Devia- tion (Analog Wide 5k/Wide 4k) and QT Deviation (Wide 5k/Wide 4k)].
  • Page 51 NX-820(G)/820 ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Termi- Remarks Panel tuning mode PC test mode Unit Unit Parts Method equipment 2. Sensitivity 1 ∗ This adjustment 1) Adj item: [PC test Write the value as can be performed...
  • Page 52 NX-820(G)/820 ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Termi- Remarks Panel tuning mode PC test mode Unit 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-820(G)/820 ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Termi- Remarks Panel tuning mode PC test mode Unit Unit Parts Method equipment 5.Open 1) Adj item: [SQL] 1) Adj item: [Panel tuning mode] Adjust with the ana- Squelch *6 Adjust: [∗∗∗]...
  • Page 54 NX-820(G)/820 ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Termi- Remarks Panel tuning mode PC test mode Unit Unit Parts Method equipment *7: Because Low RSSI at –118dBm (NXDN Narrow) is adjusted by adjusting Low RSSI at –118dBm (Analog Narrow), it is not necessary to adjust Low RSSI at –118dBm (NXDN Narrow).
  • Page 55 NX-820(G)/820 ADJUSTMENT Condition Measurement Adjustment Specifi cations/ Item Test- Termi- Remarks Panel tuning mode PC test mode Unit Unit Parts Method equipment 8. Squelch 1) Adj item: [SQLT] 1) Adj item: [Tight [Panel tuning mode] “Squelch (Tight)” (Tight) Adjust: [∗∗∗.]...

  • Page 56: Terminal Function

    NX-820(G)/820 TERMINAL FUNCTION Display unit (X54-3830-10) TX-RX unit (X57-8240-1X) 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-820(G)/820 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-820(G)/820 TERMINAL FUNCTION Signal Description Item and Condition Unit Note Name Type Output Level 0.28 Vp-p DETO FM detector output Coupling Capacitor Ω Allowable Load Analog Output Level 0.24 Vp-p RX Audio output Coupling Capacitor Ω Allowable Load Input Voltage Range 1.98...
  • Page 59 NX-820(G)/820 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...

  • Page 60: Pc Board

    NX-820(G)/820 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-820(G)/820 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 (X57-8240-1X)

    NX-820(G)/820 PC BOARD TX-RX UNIT (X57-8240-1X) Component side view (J79-0344-09) J701 J501 CN804 C815 L806 C816 CN720 R821 R641 R643 F501 CN802 IC801 R637 R835 R844 R674 C660 R639 R673 R638 CN803 C646 C645 D601 A801 Q504 C633 C403 C422...
  • Page 63 NX-820(G)/820 PC BOARD TX-RX UNIT (X57-8240-1X) Component side view (J79-0344-09) Ref. No. Address Ref. No. Address Q703 Q704 IC103 Q705 IC201 Q706 IC303 Q708 IC102 IC402 Q709 IC404 IC409 D101 IC509 D102 IC511 D111 IC512 D201 IC515 D202 IC701 D203...
  • Page 64 NX-820(G)/820 PC BOARD TX-RX UNIT (X57-8240-1X) Foil side view (J79-0344-09) Ref. No. Address Ref. No. Address Q418 IC301 Q501 IC304 Q502 IC401 Q503 R171 L114 IC405 IC406 R139 IC407 R140 IC408 IC501 IC502 C194 IC503 IC504 R148 IC506 C158 R142...
  • Page 65 NX-820(G)/820 PC BOARD TX-RX UNIT (X57-8240-1X) Foil side view (J79-0344-09) C632 Q502 R822 D705 D706 R667 R405 R406 C413 C788 C471 Q403 Q401 C409 C430 C434 C119 L106 R188 C433 C628 C629 R103 C118 IC516 C437 C457 R425 C438 R438...

  • Page 66: Interconnection Diagram

    NX-820(G)/820 INTERCONNECTION DIAGRAM OUT1 POWERGND OUT2 FILTER PREGND RFINPUT GATEBIAS DRAINBIAS RFOUTPUT 1-42 B38-0936-05...

  • Page 67: Schematic Diagram

    NX-820(G)/820 SCHEMATIC DIAGRAM TX-RX UNIT(X57-8240-1X) R:13.2V C N 4 2 3 DC/DC Converter(50M) T(25W):12.8V IC405 LT1616ES6-PBF 13.2V BATTERY C N 4 2 2 DC/DC Converter(50M) SHDN 5.02V D 4 0 7 L404 R B 5 2 0 S M - 3 0...
  • Page 68 NX-820(G)/820 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8240-1X) FSX0 FSX0 B-BUS PLL_MOD CLKX0 CLKX0 X2/CLKIN X2/CLKIN A-BUS A-BUS D-BUS D-BUS C-BUS C-BUS R526 33MDSP 100k CP507 100kX4 CN541 CN542 CP513 100kX4 DGND CP514 C533 100kX2 15MDSP 33MDSP CN502 CLKoUT HOST_RDY D[15] CN503...
  • Page 69 NX-820(G)/820 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8240-1X) FSX0 B-BUS B-BUS (MCLK) CLKX0 3.3V 18.432MHz X2/CLKIN FSX0 A-BUS CLKX0 D-BUS IC 506 C-BUS R 5 5 8 L 5 0 6 C542 0.01u INHN SM 5023C NDH-G R555 Buffer AMP(Clock) R556 XTALI...
  • Page 70 NX-820(G)/820 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8240-1X) B-BUS B-BUS FSX0 CLKX0 I C 5 0 8 X 50 1 18.423MHz TC 7 S H 08 F U - F L 7 7 - 3 01 5 - 0 5 R568 oUTPUT...
  • Page 71 NX-820(G)/820 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8240-1X) B-BUS D703,704 Q704 D703 AF Detector B-BUS 2SC4738(GR)F DA3S101F R775 Q703,704 IC 7 1 4 5.6k MIC AGC 1.44V 1.44V R777 1.44V 1.44V Bias Bias C806 SPAF R823 R819 C797 D704 Q703 2.2k DA3S101F 2SA1832(GR)F 0.22u...
  • Page 72 NX-820(G)/820 SCHEMATIC DIAGRAM ✽ 1 X57-824X-XX A801 CN801 C809 C814 C815 C816 C820 C821 C822 C823 C824 C825 C826 L802 R802 R835 R839 R842 R843 R844 IC801 D801 D802 L801 L805 L806 R561 0-12 NX-820(G) 0-13 NX-820 TX-RX UNIT (X57-8240-1X)
  • Page 73 NX-820(G)/820 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8240-1X) THP1 THP1 B-BUS C 31 47 p TEMP 0.01u 0.01u GND1 R 1 9 R 2 0 R2 4 NC_1 CPout 3 9 0 GND2 oUTPUT VCCcp NC_2 LD/PS NC_3 PLL System C 2 0...
  • Page 74 NX-820(G)/820 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8240-1X) THP1 THP1 C 47 R 46 R 8 0 R 8 3 1 2 n 10 p R 8 1 R 8 4 R 8 7 R:3.92V T:0.93V RX VCO R 58 220n MCH3914(8)-H R:1.26V...
  • Page 75 NX-820(G)/820 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8240-1X) THP1 2.6V:25℃ TX Power Module I C 10 2 R A 60 H 4 0 4 7 11 0 1 E2 3- 1 27 8 -0 5 C N 1 4 C N 10...
  • Page 76 NX-820(G)/820 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8240-1X) COU P PLER F orw ard Pow er L 1 1 6 L117 R171 R everse Power CN514 C 6 2 1 1 00 0 p S P - S P - D104,105 S P +...
  • Page 77 NX-820(G)/820 SCHEMATIC DIAGRAM DISPLAY UNIT (X54-3830-10) D 1 1-21,24 LCD BACKLIGHT R 3 4 2.07V D 2 1 R 3 6 2 7 0 B30-2337-05 K T C 4 0 7 5 E (Y ,GR ) LCD BACKLIGHT SWITCH KEY BACKLIGHT 9.72V...

  • Page 78: Block Diagram

    NX-820(G)/820 BLOCK DIAGRAM TX-RX UNIT(X57-8240-1X) 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 IC502 SRAM 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...
  • Page 79 NX-820(G)/820 BLOCK DIAGRAM Q4 2SC5383-T111 D14 DA2S101 Rippple 50CS Filter Q8 EM6M1 400-470 MHz Q9 SSM3J15FS /T_R TX: 400 - 470MHz Q101 Q102 IC102 D110,111 L407CDB D16,17 2SC5108(Y)F 2SC3356-A 2SC3357-A RA60H40471101 SKY72310-362 RKS151KJ*2 D107 RKP351KW-1P2 Loop DRIVE FINAL DRIVE Filter...
  • Page 80 NX-820(G)/820 BLOCK DIAGRAM 8pin MODULAR JACK 30pin FLAT CABLE Connector (TO TX-RX UNIT) KMI1 KMI2 KMI3...

  • Page 81: Level Diagram

    NX-820(G)/820 LEVEL DIAGRAM Receiver Section RF (Center Frequency) IF1 (49.95MHz) IF2 (450kHz) –119.0dBm –119.5dBm –114.0dBm –121.0dBm –107.5dBm -63.5dBm IF Amp ASIC FM IC Mixer C296 C263 C216 C361 C347 C343 Q201 IC303 IC507 Q305 Q202 AF (1kHz) 186.2mVrms 186.2mVrms 226.1mVrms 101.2mVrms...

  • Page 82: Optional Accessories

    NX-820(G)/820 OPTIONAL ACCESSORIES KRA-40 (GPS ACTIVE ANTENNA) Specifi cations ■ Operating Temperature ........ –30°C ~ +85°C Water Performance ............IP*7 Center Frequency ..........1575.42MHz Output Impedance ............50Ω Dimensions (Cable not included) ..... 33 x 36 x 12.8 mm Cable length ............Approx. 5 m External View ■...

  • Page 83: Specifications

    Modulation ..........16K0F3E, 14K0F2D, 14K0F3E, 12K0F2D, 8K50F3E, 7K50F2D, 8K30F1E, 8K30F1D, 8K30F7W, 4K00F1E, 4K00F1D, 4K00F7W, 4K00F2D Analog measurements made per EN standards or 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 84 NX-820(G)/820...
  • Page 85 NX-820(G)/820 NX-820(G)/820 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-820(G)/820 NX-820(G)/820 PC BOARD PC BOARD TX-RX UNIT (X57-8240-1X) Component side view (J79-0344-09) TX-RX UNIT (X57-8240-1X) Component side view (J79-0344-09) Ref. No. Address Ref. No. Address Q703 J701 J501 Q704 IC103 Q705 IC201 Q706 IC303 Q708 IC102 IC402 Q709 CN804...
  • Page 87 NX-820(G)/820 NX-820(G)/820 PC BOARD PC BOARD TX-RX UNIT (X57-8240-1X) Foil side view (J79-0344-09) TX-RX UNIT (X57-8240-1X) Foil side view (J79-0344-09) C632 Ref. No. Address Ref. No. Address Q418 IC301 Q501 IC304 Q502 Q502 IC401 Q503 R171 L114 IC405 IC406 R139...
  • Page 88 C814 C815 C816 C820 C821 C822 C823 C824 C825 C826 D801 D802 L801 L802 L805 L806 R561 R802 R835 R839 R842 R843 R844 IC801 0-12 NX-820(G) FSX0 FSX0 FSX0 0-13 NX-820 DISPLAY UNIT (X54-3830-10) B-BUS B-BUS B-BUS B-BUS B-BUS B-BUS...
  • Page 89 TX-RX UNIT(X57-8240-1X) Q4 2SC5383-T111 D14 DA2S101 X501 Rippple L77-3015-05 50CS IC506 Filter Q8 EM6M1 400-470 MHz SM5023CNDH-G VCTCXO Q9 SSM3J15FS BUFF 18.432MHz /T_R TX: 400 - 470MHz /PCS_DSP Q101 Q102 IC102 D110,111 L407CDB PSCK_DSP D16,17 2SC5108(Y)F 2SC3356-A 2SC3357-A RA60H40471101 PLL MOD SKY72310-362 RKS151KJ*2 D107 RKP351KW-1P2...

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