Kenwood NX-820G Quick Start Manual

Uhf digital transceiver

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Instruction manual (23 pages)

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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.

B53-7044-00 ( Y ) 80

Panel assy

(A62-1200-03)

TERMINAL FUNCTION .............................56

PC BOARD

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

OPTIONAL ACCESSORIES

KRA-40 ..................................................82

SPECIFICATIONS ......................................83

Badge

(B43-1675-04)

This product uses Lead Free solder.

Table of Contents

Summary of Contents for Kenwood NX-820G

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 (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 (X57-8240-1X)....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 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
NX-820(G)/820 SYSTEM SET-UP Merchandise received Frequency range (MHz) RF power Type Choose the type of transceiver 400~470 NX-820(G)/820 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)
Page 5 The latest version of the USB driver is available for down- 6-3. Programming load from the following URL: 1. Start up the ﬁ rmware programming software (Fpro.exe(ver. http://www.kenwood.com/usb-com/ 6.1 or later)). The Fpro.exe exists in the KPG-141D in- (This URL may change without notice.) stalled folder.
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 password in this procedure, “CLONE MODE”...
Page 7: Installation
NX-820(G)/820 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-820(G)/820 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-820(G)/820 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-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. 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-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 consists of a receiver, transmitter, phase-locked loop (PLL) passed through the antenna switch (D110, 111 and 107) and frequency synthesizer, base band parts, power supply, and...
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 5-3. 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-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, 5-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-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 IC102 TX power module Transistor...
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 Variable capaci- PLL f-in BPF tune Transistor...
Page 19: Parts List
NX-820(G)/820 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-820(G)/820 PARTS LIST DISPLAY UNIT (X54-3830-10) TX-RX UNIT (X57-8240-1X) 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 CK73HB1H471K CHIP C 470PF CC73HCH1H070B CHIP C 7.0PF...
Page 21 NX-820(G)/820 PARTS LIST TX-RX UNIT (X57-8240-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation C295 CC73HCH1H060B CHIP C 6.0PF C169 CK73HB1H102K CHIP C 1000PF C171 CC73HCH1H101J CHIP C 100PF C296 CC73HCH1H180G...
Page 22 NX-820(G)/820 PARTS LIST TX-RX UNIT (X57-8240-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation C432 CK73GB1H104K CHIP C 0.10UF C553 CK73HB1A105K CHIP C 1.0UF C555,556 CK73HB1H103K CHIP C 0.010UF C433,434 CK73FB1E475K...
Page 23 NX-820(G)/820 PARTS LIST TX-RX UNIT (X57-8240-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation C729 CK73HB1H681K CHIP C 680PF CN10-12 E23-1278-05 TERMINAL C732 CK73HB1H102K CHIP C 1000PF CN14,15 E23-1278-05 TERMINAL C733...
Page 24 NX-820(G)/820 PARTS LIST TX-RX UNIT (X57-8240-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation L212 L92-0138-05 CHIP FERRITE RK73HB1J470J CHIP R 1/16W L213,214 L41-2278-14 SMALL FIXED INDUCTOR(22NH) RK73HB1J184J CHIP R 180K 1/16W...
Page 25 NX-820(G)/820 PARTS LIST TX-RX UNIT (X57-8240-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation R141 RK73HB1J333J CHIP R 1/16W R328 RK73HB1J183J CHIP R 1/16W R329 RK73HB1J100J CHIP R 1/16W R142 RK73HB1J000J...
Page 26 NX-820(G)/820 PARTS LIST TX-RX UNIT (X57-8240-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation R508-511 RK73HB1J101J CHIP R 1/16W R657 RK73HB1J472J CHIP R 4.7K 1/16W R658,659 RK73GB2A000J CHIP R 1/10W R512 RK73HB1J104J...
Page 27 NX-820(G)/820 PARTS LIST TX-RX UNIT (X57-8240-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation D502 DB2S310 DIODE R779 RK73HB1J223J CHIP R 1/16W D504 DB2S310 DIODE R783 RK73HB1J154J CHIP R 150K 1/16W D505-510...
Page 28 NX-820(G)/820 PARTS LIST TX-RX UNIT (X57-8240-1X) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation Q105 FK330301 Q106 EMD5 TRANSISTOR Q201 3SK318 Q202 NESG240034 TRANSISTOR Q303 2SC5108(Y)F TRANSISTOR Q305 2SC4215-F(Y) TRANSISTOR Q401...
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. These parts must be ordered separately.
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 ● Checking the signal output from When a normal 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/FLASH/SRAM may be broken.
Page 32 NX-820(G)/820 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 33 NX-820HS: X57-8240-17 the Trunking System following the new ESN. Type : Kx • When a new printed circuit board is used, the KENWOOD The same number as the KENWOOD ESN ESN changes, as does the Transceiver Information dis- label is written.
Page 34: Adjustment
NX-820(G)/820 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 5k: “W”...
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 you want in actual operation.
Page 36 NX-820(G)/820 ADJUSTMENT ■ Key operation • NXDN mode signaling 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) Wide/Narrow/Very narrow Tone Pattern (1031Hz) Shift to panel test mode...
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. The lock voltage of VCO (Transmit) is adjusted.
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 Section 2 1~4096 9 point ADJ...
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 ✓...
Page 40 NX-820(G)/820 ADJUSTMENT ] hold LTR Deviation LTR Deviation Narrow Wide ] hold ] press DTMF Deviation DTMF Deviation Wide DTMF Deviation Wide Narrow DTMF DTMF DTMF ] press ] hold Single Tone Deviation Single Tone Deviation Wide Single Tone Deviation Wide Narrow TONE...
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 check PTT : ON Channel: 1...
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 more Wide 5k:...
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 tuning 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: [∗∗∗∗] Deviation (NXDN meter tuning...
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: [∗∗∗.∗.] Deviation (Analog meter tuning...
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: [∗∗∗∗.] Deviation (Analog meter tuning...
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: [∗∗∗.∗.] Tone Deviation meter tuning...
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 [Sensitivity 1] AF VM Ext.SP...
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 After input signal 2) Adj item:...
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: [∗∗∗] [Open Squelch AF VM Ext.SP...
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: [∗∗∗.] Squelch (Analog AF VM Ext.SP...
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 CMOS input Digital (Pull Up: 5.0V/10kΩ)
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 Vp-p Standard deviation...
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 Input Current Rds (ON) mΩ...
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 C427 C429 CN423...
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 IC702 D205 TH101...
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 IC507 R154 IC508...
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 L805 Q410 CN416...
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 BooST Surge Reverse...
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 D[15] D[14] D[14]...
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 IC5 0 6 C-BUS R5 5 8 C542 L 5 0 6 0.01u INHN SM5 0 2 3 CNDH-G R555 Buffer AMP(Clock) R556 XTALI XTALo...
Page 70 NX-820(G)/820 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8240-1X) B-BUS B-BUS FSX0 CLKX0 I C5 0 8 X 501 18.423MHz TC7 SH0 8 FU-F L7 7- 3015- 05 R568 oUTPUT SCK1 R569 R567 oUTY oUTY C543 AND Gate AND Gate CN523 I C3 0 1 0.1u TC 7S H0 8FU -F /PCS...
Page 71 NX-820(G)/820 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8240-1X) B-BUS D703,704 Q 70 4 D703 AF Detector B-BUS 2SC4738(GR)F DA3S101F R775 Q703,704 I C7 1 4 5.6k MIC AGC 1.44V 1.44V R777 1.44V 1.44V Bias Bias C806 SPAF R823 R819 C797 Q703 D704 2.2k DA3S101F 2SA1832(GR)F...
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 D801 D802 L801 L802 L805 L806 R561 R802 R835 R839 R842 R843 R844 IC801 0-12 NX-820(G) 0-13 NX-820 TX-RX UNIT (X57-8240-1X) B-BUS B-BUS ✽...
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 19 R 2 0 R2 4 CPout NC_1 3 9 0 GND2 oUTPUT VCCcp NC_2 LD/PS NC_3 PLL System C 20 R 7 2 L 7 7 -3 0 7 3 -0 5 NC_4 I C 2...
Page 74 NX-820(G)/820 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8240-1X) THP1 THP1 L2 0 R 46 R8 0 R 8 3 1 2 n 1 0p R 8 1 R8 7 R 8 4 R:3.92V T:0.93V RX VCO L 24 R5 8 22 0 n MCH3914(8)-H R:1.26V RX VCO Assist Tune...
Page 75 NX-820(G)/820 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8240-1X) THP1 2.6V:25℃ TX Power Module I C1 0 2 RA6 0 H4 0 47 1 10 1 E2 3 - 1 2 7 8 - 0 5 C N 1 4 C N1 0 CN 1 1 D110,111 Antenna Switch...
Page 76 NX-820(G)/820 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8240-1X) COUP PL ER For wa rd Po we r L1 17 R171 L1 16 Rever se P o we r CN514 C 6 2 1 1 00 0 p S P - S P - D104,105 S P + TX Power Detection...
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 KT C4 0 7 5 E( Y, GR ) LCD BACKLIGHT SWITCH KEY BACKLIGHT 9.72V SWITCH 5.0V INT SP...
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 IC503 IC501 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 IC301 PSCK_DSP TC7SH08FU-F...
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 FINAL DRIVE DRIVE BUFF BUFF Filter D104...
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 FM IC ASIC Mixer C296 C263 C216 C361 C347 C343 Q201 IC303 IC507 Q202 Q305 AF (1kHz) 186.2mVrms 186.2mVrms 226.1mVrms 101.2mVrms 21.5mVrms Audio Amp...
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 ■...
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 IC404 C815 L806...
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 Q502 IC304 Q502 IC401 Q503 R171 L114 IC405 IC406 R139 IC407 R140 IC408...
Page 88 TX-RX UNIT(X57-8240-1X) ✽ 1 X57-824X-XX A801 CN801 C809 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 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 PSCK_DSP D16,17 D110,111 L407CDB 2SC5108(Y)F 2SC3356-A 2SC3357-A RA60H40471101 PLL MOD SKY72310-362 RKS151KJ*2 D107 RKP351KW-1P2...

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