Kenwood NX-203 Service Manual
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Kenwood NX-203 Service Manual

Vhf digital transceiver
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SERVICE MANUAL
VHF DIGITAL TRANSCEIVER
NX-203
This product complies with the RoHS directive for the European market
.
This product uses Lead Free solder.
B5B-7214-00
No.RQ076
COPYRIGHT © 2016 JVC KENWOOD Corporation
2016/1

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  • Page 1 SERVICE MANUAL VHF DIGITAL TRANSCEIVER NX-203 This product complies with the RoHS directive for the European market This product uses Lead Free solder. B5B-7214-00 No.RQ076 COPYRIGHT © 2016 JVC KENWOOD Corporation 2016/1...

  • Page 2: Table Of Contents

    SPECIFICATIONS ............. 98 ADJUSTMENT............38 Document Copyrights Firmware Copyrights Copyright 2016 by JVC KENWOOD Corporation. All rights The title to and ownership of copyrights for firmware reserved. embedded in KENWOOD product memories are reserved No part of this manual may be reproduced, translated, for JVC KENWOOD Corporation.

  • Page 3: System Set-Up

    Frequency range (MHz) RF power Type Choose the type of transceiver TX/RX 136~174 NX-203 K A personal computer, programming interface (KPG-36A/36U/36X), and FPU (programming software) are required for programming. Transceiver programming (The frequency, and signaling data are programmed for the transceiver.)
  • Page 4 NX-203 REALIGNMENT 5-2. Connection procedure 2. How to Enter Each Mode 1. Connect the transceiver to the computer using the inter- Mode Operation face cable (KPG-36A/36U/36X). (Conection is the same User mode Power ON as in the PC Mode.) Panel test mode...
  • Page 5 NX-203 REALIGNMENT 6-2. Connection procedure 7. Clone Mode Connect the transceiver to the personal computer using Programming data can be transferred from one transceiv- the interface cable (KPG-36A/36U/36X). (Connection is the er to another by connecting them via their external universal same as in the PC Mode.)

  • Page 6: Installation

    NX-203 REALIGNMENT Cloning cable 4. Power ON the target transceiver. (E30-3325-05) 5. Connect the cloning cable (part No. E30-3325-05) to the universal connectors on the source and target. 6. Press the [ ] key on the source while the source displays “CLONE MODE”...

  • Page 7: Disassembly For Repair

    NX-203 INSTALLATION 3. Remove the OPTION PCB from the connector (CN710) of the Control PCB. VGS-1 OPTION PCB PCB hollow Flat spring (G02-1846-03) Convex part CN710 Cushion (G13-1974-04) 21x21x1.0mm VGS-1 VGS-1 Flat spring 4. Attach the flat spring (G02-1846-03) to the VGS-1 as shown in the fi...
  • Page 8 NX-203 DISASSEMBLY FOR REPAIR 2. Precautions for Disassembly ■ Removing the TX-RX unit from the chassis 1. Remove the cord ASSY from the connector of the TX-RX unit (CN400) q. 2. Remove the PTT FPC from the connector of the TX-RX unit (CN401) w.
  • Page 9 NX-203 DISASSEMBLY FOR REPAIR ■ Inserting the Volume and Channel switch into ■ Relay hardware (E29-1242-04) installation proce- the chassis dure Insert the volume and channel switch into the chassis 1. Fit one side of the relay hardware to a right corner of the chassis using a pair of tweezers q.
  • Page 10 Sticker B42-7417-04 “NEXEDGE” is printed. Plastic Cabinet (6-key) A02-4002-23 Badge B43-1606-14 “KENWOOD” is printed. Used for fi xing the LCD ASSY on the Illumination Guide (LCD). LCD ASSY B38-0923-05 Adhesive Sheet (LCD) J99-0714-04 Also used for fi xing the Illumination Guide (LCD) on the Control Unit.

  • Page 11: Circuit Description

    CIRCUIT DESCRIPTION 1. Overview 2. Frequency Confi guration The NX-203 is a VHF portable transceiver designed to The receiver is a double-conversion superheterodyne operate in the frequency range of 136 to 174MHz. The unit using the first intermediate frequency (IF) of 58.05MHz consists of receiver, transmitter, phase-locked loop (PLL) and the second IF of 450kHz.
  • Page 12 NX-203 CIRCUIT DESCRIPTION 3-3. Audio Amplifi er Circuit 3-4. Squelch Circuit Audio processing (high-pass filter, low-pass filter, de- It amplifies the demodulated noise signal from IC108 emphasized and so on) at FM mode and decoding at NXDN after filtering through the BPF circuit. Then, the amplified mode are processed by DSP .
  • Page 13 NX-203 CIRCUIT DESCRIPTION 4-3. VOX 4-5. APC Circuit IC716 (2/2) amplifi es the audio signal captured in the mi- The APC circuit always monitors the current flowing crophone. The signal is then converted into the DC voltage, through the RF power amplifi er (Q106) and keeps a constant rectifi...
  • Page 14 NX-203 CIRCUIT DESCRIPTION 5-3. PLL IC (IC3) 5-4. Doubler (Q4) The PLL IC compares the differences in phases of the The doubler (Q4) extracts the twice harmonic component VCO oscillation frequency and the VCTCXO reference from the signal from the VCO. This twice harmonic compo- frequency, returns the difference to the VCO CV terminal nents is then fed into PLL (IC3) through band pass fi...
  • Page 15 NX-203 CIRCUIT DESCRIPTION 6-2. Memory Circuit 6-6. DSP The memory circuit consists of the ASIC (IC108) and the The DSP circuit consists of a DSP (IC102) and processes SRAM (IC103) and fl ash memory (IC101). The fl ash memory the base band signal. The DSP operates on an external clock has capacity of 32M-bit that contains the transceiver control of 18.432MHz (the same as the IC108), the I/O section op-...
  • Page 16 NX-203 CIRCUIT DESCRIPTION 8. Signaling Circuit TX-RX unit (X57) F400 RF Final AMP 8-1. Encode (QT/DQT/LTR/DTMF/2-tone/MSK) 2.5A Each signaling data signal of QT, DQT, LTR, DTMF , 2-tone IC400 /SAVE and MSK is generated by the DSP circuit, superposed on Q405 a modulation signal and output from IC108.

  • Page 17: Components Description

    NX-203 COMPONENTS DESCRIPTION Control unit (X53-4590-14) Ref. No. Part Name Description Ref. No. Part Name Description LCD backlight switch LCD contrast MIC mute control IC101 Flash memory MIC mute switch Q401,402 Level converter IC102 IC103 SRAM Q403 Transistor SB2 switch...
  • Page 18 NX-203 COMPONENTS DESCRIPTION TX-RX unit (X57-8950-11) Ref. No. Part Name Description Ref. No. Part Name Description Q203 Mixer Temperature sensor Q204 RF AMP AF AMP for VCO tune Q401 50R switch PLL IC Q402 50IF switch OP AMP (VCO MOD/APC)

  • Page 19: Parts List

    NX-203 PARTS LIST PARTS LIST 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.
  • Page 20 NX-203 PARTS LIST CONTROL UNIT (X53-4590-14) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description nation nation CC73HCH1H101J CHIP C 100PF C161 CK73HB1E682K CHIP C 6800PF CC73HCH1H101J CHIP C 100PF C401 CK73HBB1A104K CHIP C 0.10UF...
  • Page 21 NX-203 PARTS LIST CONTROL UNIT (X53-4590-14) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description nation nation C469 CK73HBB1H102K CHIP C 1000PF C763 CK73HBB1E103K CHIP C 0.010UF C470 CK73HBB1H102K CHIP C 1000PF C764...
  • Page 22 NX-203 PARTS LIST CONTROL UNIT (X53-4590-14) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description nation nation HZC6.8-E ZENER DIODE IC705 TC75W51FK(F) MOS-IC HZC6.8-E ZENER DIODE IC706 TC75S51FE(F) MOS-IC NNCD6.8G-A ZENER DIODE IC707...
  • Page 23 NX-203 PARTS LIST CONTROL UNIT (X53-4590-14) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description nation nation Q409 2SA1955A-F TRANSISTOR R120 RK73HB1J474J CHIP R 470K 1/16W Q410 SSM3K15TE(F) R121 RK73HB1J104J CHIP R 100K...
  • Page 24 NX-203 PARTS LIST CONTROL UNIT (X53-4590-14) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description nation nation R188 RK73HB1J473J CHIP R 1/16W R461 RK73HB1J103J CHIP R 1/16W R189 RK73HB1J104J CHIP R 100K 1/16W...
  • Page 25 NX-203 PARTS LIST CONTROL UNIT (X53-4590-14) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description nation nation R530 RK73HB1J101J CHIP R 1/16W R743 RK73HB1J103J CHIP R 1/16W R531 RK73HB1J101J CHIP R 1/16W R744...
  • Page 26 NX-203 PARTS LIST CONTROL UNIT (X53-4590-14) TX-RX UNIT (X57-8950-11) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description nation nation R812 RK73HB1J562J CHIP R 5.6K 1/16W CK73HB1C103K CHIP C 0.010UF R813 RK73HB1J273J CHIP R...
  • Page 27 NX-203 PARTS LIST TX-RX UNIT (X57-8950-11) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description nation nation CC73HCH1H101J CHIP C 100PF C178 CC73HCH1H120J CHIP C 12PF CK73HBB1A104K CHIP C 0.10UF C179 CC73HCH1H100B CHIP C...
  • Page 28 NX-203 PARTS LIST TX-RX UNIT (X57-8950-11) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description nation nation C268 CC73HCH1H390J CHIP C 39PF C429 CC73HCH1H470J CHIP C 47PF C270 CC73HCH1H1R5B CHIP C 1.5PF C430...
  • Page 29 NX-203 PARTS LIST TX-RX UNIT (X57-8950-11) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description nation nation 1SV282-F VARIABLE CAPACITANCE DIODE L40-2778-67 SMALL FIXED INDUCTOR(27NH) HVC376B VARIABLE CAPACITANCE DIODE L40-1285-92 SMALL FIXED INDUCTOR(120NH)
  • Page 30 NX-203 PARTS LIST TX-RX UNIT (X57-8950-11) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description nation nation Q103 RD01MUS1-T113 RK73HB1J154J CHIP R 150K 1/16W Q104 2SC5383-T111 TRANSISTOR RK73HB1J101J CHIP R 1/16W Q105 LTC044EEBFS8...
  • Page 31 NX-203 PARTS LIST TX-RX UNIT (X57-8950-11) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description nation nation R152 RK73EB2E823J CHIP R 1/4W R254 RK73HB1J103J CHIP R 1/16W R153 RK73HB1J473J CHIP R 1/16W R255...
  • Page 32 NX-203 PARTS LIST TX-RX UNIT (X57-8950-11) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description nation nation R420 RK73HB1J473J CHIP R 1/16W R421 RK73HB1J102J CHIP R 1.0K 1/16W R422 RK73HB1J474J CHIP R 470K...

  • Page 33: Exploded View

    NX-203 EXPLODED VIEW Control unit (X53) Optional board unit (X57 B/2) Hx10 TX-RX unit (X57 A/2) : N08-0564-04 : N0Z-0001-00 C M2.6 x 8 : N09-2440-15 : N09-6549-04 E M2.6 x 4 : N09-6554-05 : N14-0844-04 2 x 5 : N83-2005-48...

  • Page 34: Packing

    NX-203 PACKING 6 Cap 60 Belt clip (B09-0712-03) (J29-0730-05) 53 Packing (Cap) (G53-1769-04) G Pan head machine screw (N09-6585-15)x2 A Dressed screw (N08-0564-04) 95 Packing fixture (H12-4293-02) 96 Carton board (H13-2135-04) 14 Instruction manual (B62-2601-00) 97 Item carton case (H52-2841-02)

  • Page 35: Trouble Shooting

    NX-203 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 36 NX-203 TROUBLE SHOOTING When a normal ● Checking the output signal value is confirmed. from the ASIC When an abnormal value is confirmed. Points to be checked Normal voltage Remove R432. If the ASIC side is 0V, SBC R432 3.3V the ASIC/FLASH/SRAM may be broken.
  • Page 37 X53-459 (NX-303). (X53-4590-15). Model name: [X53-459] NX-203/303S KENWOOD ESN Type: K The same number as the KENWOOD ESN label is written. The same number as the NXDN ESN NXDN ESN label is written. The shielding plate is soldered on the Service Control unit ■...

  • Page 38: Adjustment

    Use the KPG-110SM on the NXDN Trunking System side to reprogram the NXDN ESN number. KENWOOD • When a new printed circuit board is used, the KENWOOD ESN Lable ESN changes, as does the Transceiver Information display NXDN ESN Label...
  • Page 39 NX-203 ADJUSTMENT ■ Key operation • LED indicator Red LED Lights during transmission. “FNC” not appears on the sub LCD display Green LED Lights when there is carrier. Function Display • Sub LCD indicator [Selector] - “FNC” Appears at function on.
  • Page 40 NX-203 ADJUSTMENT • Analog mode signaling • LCD display in panel tuning mode CV voltage, AD value, etc None None Sub LCD display None 100Hz Square Wave CNTR Main LCD display LTR Data: LTR Data: AREA=0, GOTO=12 AREA=0, GOTO=12 HOME=12...
  • Page 41 NX-203 ADJUSTMENT ■ Adjustment item supplement Adjustment Item Description LCD contrast The contrast of LCD display can be changed. “Counterclockwise Volume” is adjusted at the minimum volume position. Counterclockwise Volume “Clockwise Volume” is adjusted at the maximum volume position. These adjustments can correct the volume variation.
  • Page 42 NX-203 ADJUSTMENT ■ Adjustment item and Display Aw (Analog An (Analog Nn (NXDN Nv (NXDN Adjusutment Main LCD Very Narrow) Adjust item Wide) Narrow) Narrow) Order Sub LCD display item display Number Adjustment range 1 point ADJ Common LCD contrast...
  • Page 43 NX-203 ADJUSTMENT Aw (Analog An (Analog Nn (NXDN Nv (NXDN Adjusutment Main LCD Very Narrow) Adjust item Wide) Narrow) Narrow) Order Sub LCD display item display Number Adjustment range (RSSI measurement Receive Sensitivity 2 SENS2 value) Section 3 1~256 - *1...
  • Page 44 NX-203 ADJUSTMENT [Side2] Analog MAX Deviation Analog MAX Deviation Narrow Wide ADEV ADEV ] press ] hold 5 reference level Adjustments [Side2] QT Deviation QT Deviation Narrow Wide ] press ] hold [Side2] DQT Deviation DQT Deviation Narrow Wide ] press...
  • Page 45 Schematic diagram ■ Nut wrench In order to turn the volume nut and the channel selector –Terminal nut, use a recommendation tool. (Black) KENWOOD part No.: W05-1123-00 – Power Power ■ Battery jig (W05-1370-00) cable supply Connect the power cable properly between the battery...
  • Page 46 NX-203 ADJUSTMENT ■ Universal connector BLU (7) To transceiver PTT SW Use the interface cable (KPG-36A/36U/36X) for PC tuning or the lead wire with plug (E30-3287-28) and screw (N08- BRN (10) 0535-08) for panel tuning. Connect the plug to the universal connector of the transceiver and tighten the screw.
  • Page 47 NX-203 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 Panel Check an internal ±0.5ppm...
  • Page 48 NX-203 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...
  • Page 49 NX-203 ADJUSTMENT Condition Measurement Adjustment Specifi cations / Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 5. Receive 1) Adj item: [RAST] 1) Adj item: Panel [Panel The sub LCD display 2.5V±0.1V Assist Adjust: [✳✳✳✳]...
  • Page 50 NX-203 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: [HIPWR] 1) Adj item: [High Power Panel Panel [Panel 5.0W ±0.2W...
  • Page 51 NX-203 ADJUSTMENT Condition Measurement Adjustment Specifi cations / Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment Maximum 1) Adj item: [Nv NDEV] 1) Adj item: [Maximum Deviation Panel Panel [Panel 1337Hz 1311~1363Hz Deviation Adjust: [✳✳✳✳]...
  • Page 52 NX-203 ADJUSTMENT Condition Measurement Adjustment Specifi cations / Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 1) Adj item: [Aw QT] 1) Adj item: [QT Devia- Deviation Panel Panel [Panel Write the value as 0.75kHz±0.05kHz...
  • Page 53 NX-203 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: [An TONE] 1) Adj item: [Single Deviation Panel Panel [Panel Write the value as 1.50kHz±0.05kHz...
  • Page 54 NX-203 ADJUSTMENT Condition Measurement Adjustment Specifi cations / Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 15. BATT 1) Adj item: [BATT] 1) Adj item:[Battery Power Panel Press the PTT detection Adjust: [✳✳✳]...
  • Page 55 NX-203 ADJUSTMENT Necessary adjustment and order Mode Signaling Wide Narrow Very Narrow Step1. Balance adjust Step1. Balance adjust Audio Step2. Maximum Deviation (NXDN Narrow) Step2. Maximum Deviation (NXDN Very Narrow) NXDN Step1. Balance adjust CWID Step2. Maximum Deviation (Analog Narrow) Step3.
  • Page 56 NX-203 ADJUSTMENT Condition Measurement Adjustment Specifi cations / Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 3. Sensitivity 2 1) Adj item: [SENS2] 1) Adj item: Panel Panel [Panel Write the value as adjust Adjust: [✳✳✳]...
  • Page 57 NX-203 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: [An SQL] 1) Adj item: Panel [Panel tuning mode] “Open Squelch” Squelch Adjust: [✳✳✳]...
  • Page 58 NX-203 ADJUSTMENT Condition Measurement Adjustment Specifi cations / Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment Low RSSI 1) Adj item: [Aw LRSSI] 1) Adj item: [Low RSSI Panel [Panel tuning mode] at 118dBm Adjust: [✳✳✳]...
  • Page 59 NX-203 ADJUSTMENT Condition Measurement Adjustment Specifi cations / Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment High RSSI 1) Adj item: [Nv HRSSI] 1) Adj item: [High Panel [Panel tuning mode] Adjust with the ana- at –80dBm...

  • Page 60: Terminal Function

    NX-203 TERMINAL FUNCTION Control unit (X53-4590-14) Pin No. Name Function Pin No. Name Function Power output after passing through the fuse Chip select output Power input after power switch /RES LCD reset output CN404 Address bus 0 output LED_G Green LED control output...
  • Page 61 NX-203 TERMINAL FUNCTION Pin No. Name Function Pin No. Name Function Thermistor voltage input OPT2 PLL lock detect input 38M output RXEO Refer to “CN710 26-pin connector SCK1 PLL clock output RXEI specifi cation” described on pages 64 to 66.
  • Page 62 NX-203 TERMINAL FUNCTION Option board unit (X57-8950-11 B/2) Pin No. Name Function Side_G Key matrix input (SIDE1,2 key) Pin No. Name Function CN736 Side_1 Key matrix output (SIDE1 key) OPT1 W_/N No connection SDO1 PLL serial data input OPT3 26P_RD...
  • Page 63 NX-203 TERMINAL FUNCTION Universal connector Rating and Condition Signal Pin No. Name I/O Function Type Parameter Unit EXT/INT speaker switch input Digital L: External speaker ON H: Internal speaker ON [8 load] Max output power (1kHz, Batt=7 .5V) Analog BTL output + for external speaker [8...
  • Page 64 NX-203 TERMINAL FUNCTION CN710 26-pin connector specifi cation Rating and Condition Pin No. Name Signal Type Parameter Unit OPT1 [Input] VIH OPT4 [Input] VIL OPT5 Digital [Output] VOH OPT8 [Output] VOL OPT11 OPT3 [Input] VIH OPT7 [Input] VIL Digital OPT2...
  • Page 65 NX-203 TERMINAL FUNCTION Rating and Condition Pin No. Name Signal Type Parameter Unit Output Amplitude (1kHz, 60% deviation) mVp-p Coupling Capacitor µF RXEO Analog  Output Impedance 2.2k Allowable Frequency 3000 Input Amplitude (1kHz, 60% deviation) mVp-p Coupling Capacitor µF...
  • Page 66 NX-203 TERMINAL FUNCTION Pin No. Name Device Connection Function ANI board 26P_TD VGS-1 Serial data output ANI board PTT signal output OPT4 VGS-1 Enable ANI board OPT10 VGS-1 USEL UART speed select output ANI board Emergency Emergency signal output OPT5...
  • Page 67 NX-203 TERMINAL FUNCTION CN736 Option board connector specifi cation Pin No. Name Device Connection Function [COR] Conv/LTR L: Activity receiving H: Not activity receiving [TOR] Conv/LTR L: Activity receiving (Sub Tone or LTR ID is OK) OPT1 ANI board Aux Output...

  • Page 68: Pc Board

    NX-203 PC BOARD CONTROL UNIT (X53-4590-14) Component side view (J79-0131-39) J79-0131-39 Ref. No. Address Ref. No. Address Ref. No. Address IC415...
  • Page 69 NX-203 PC BOARD CONTROL UNIT (X53-4590-14) Component side view (J79-0131-39) CN22 CN23 /RES R406 C452 R500 CN24 Component side Layer 1 Layer 2 Layer 3 Layer 4 Layer 5 Layer 6 Foil side...
  • Page 70 NX-203 PC BOARD CONTROL UNIT (X53-4590-14) Foil side view (J79-0131-39) R402 D409 L719 R472 R496 C429 R442 Q405 L410 R474 C440 IC413 C415 + L401 R462 R133 R489 C437 C416 R132 R471 C438 R490 R495 C806 C424 R140 R484 R446...
  • Page 71 NX-203 PC BOARD CONTROL UNIT (X53-4590-14) Foil side view (J79-0131-39) R735 C712 R750 R745 IC707 R793 C717 C722 R829 C767 R758 R755 R753 C745 L710 R847 R414 C731 R746 C714 R800 R415 Q702 D703 R738 R802 R416 R845 R749 C746...

  • Page 72: Tx-Rx Unit (X57-8950-11)

    NX-203 PC BOARD TX-RX UNIT (X57-8950-11) (A/2) Component side view (J79-0434-09 A/2) C131 C152 C127 R165 C141 R149 R150 R164 Q105 R155 R157 R319 Q104 C128 R131 R170 D106 C123 D103 R134 C129 R126 C120 R166 C168 R321 R254 R253...
  • Page 73 NX-203 PC BOARD TX-RX UNIT (X57-8950-11) (A/2) Component side view (J79-0434-09 A/2) C141 R144 R147 C143 C458 Side_G C457 R148 Side_1 C468 Side_2 C133 R151 TX-RX UNIT C499 (X57-8950-11) (B/2) R420 Q107 Q405 R155 R421 R157 C410 D400 RXEO OPT9...
  • Page 74 NX-203 PC BOARD TX-RX UNIT (X57-8950-11) (A/2) Foil side view (J79-0434-09 A/2) R162 R163 L118 C154 L115 C166 TX-RX UNIT (X57-8950-11) (B/2) CN102 J79-0434-09 B/2 C149 L110 C146 C135 L117 C414 26 POW OPT6 C299 RXEI D209 R422 C466 RXEO...
  • Page 75 NX-203 PC BOARD TX-RX UNIT (X57-8950-11) (A/2) Foil side view (J79-0434-09 A/2) L112 C173 C134 L106 R142 R137 R133 C130 L108 R171 C124 Q106 Q103 R124 C178 L103 C114 R123 R103 L104 C102 C115 C116 C111 L100 R102 C160 R119...

  • Page 76: Interconnection Diagram

    NX-203 INTERCONNECTION DIAGRAM POWER SW/ CHANNEL SWITCH UNIT AF VOL SELECTOR X41-384 6KEY/SP/MIC CN403 CN23 /RES CONTROL PCB X53-459 CN701 CN710 CN405 CN736 UNIVERSAL CONNECTOR OPTION PCB X57-895 B/2...
  • Page 77 NX-203 INTERCONNECTION DIAGRAM CORD ASSY CN404 CN400 X42-351 LED_G LED_G /EMG /EMG LED_R LED_R /SAVE /SAVE I2CCK I2CCK /5TC /5TC I2CSDA I2CSDA /T_R /T_R ASSIST ASSIST SWITCH UNIT VAGC VAGC X41-383 TCXO_MOD TCXO_MOD PGND CN401 RSSI RSSI PGND AGND Side_G...

  • Page 78: Schematic Diagram

    NX-203 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4590-14) R406 /LCDRST IC402 R407 TC7WZ245FK-F LCD CONTRAST NJM2130F3-ZB R408 IC401 TC74LCX245FK -7.13V 3.28V 100p C402 0.1u /CS4 C405 2.2u16 IC401,402 BUS SW IC403 -9.74V LM2682MMX C403 4.92V 2.2u16 C401 R409 0.1u L707 VoUT VOLTAGE...
  • Page 79 NX-203 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4590-14) X2_CLKIN L712 R126 100 MCDIAF R127 0 DVSS7 R128 0 BCLKX1 MCSCKAF R135 100k CVSS8 FSDET CVDD5 C119 1u R141 100k INT3 INT3 CVSS9 INT2 DVDD5 C101 INT1 /DINT R150 1k 0.1u INT0 /SYMTIM...
  • Page 80 NX-203 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4590-14) GPIo7 ASQDET AUD_IREFC X2_CLKIN AD12_IREFF R158 XTALI XTALo CN104 DSPCK /RINT USRCKI ADD0 ADD1 ADD2 ADD3 ADD4 ADD5 L713 ADD6 ADD7 IC107 BUFFER ADD8 SM5023CNDH-G X102 ADD9 18.432MHz ADD10 C130 ADD11 oUTPUT 0.01u ADD12...
  • Page 81 NX-203 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4590-14) GPIo7 GPIo7 33A-1 IC108 ASIC R470 IFADCN 33MAS 33MAS 33A-1 33A-1 SPCS10 SPCS10 RESET X53-459 4/10...
  • Page 82 NX-203 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4590-14) C459 GPIo7 L101 470p 33A-1 C460 L102 VOL SW/ENC 6800p C461 POWER SW/AF VOL 470p DGND3 CN403 R501 DGND2 DGND1 2.2k L714 R506 VOL_GND DVDIo7 L403 2.2k L716 DVDIo6 R510 DVDIo5 CHANNEL SELECTOR ENC3...
  • Page 83 NX-203 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4590-14) D702 R819 DA2S101 R790 CONTROL ASQDET Q701 R798 100k 2SA1832(GR)F C719 OPT10 C755 47p 0.1u R803 OPT SW R747 ASQ DET NOISE ASQAPC IC711 DETECTOR TC75W51FK(F) D705 SQL BPF/ R824 KDR731 R739 C716 SQL DC AMP...
  • Page 84 NX-203 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4590-14) R : 5.14V Q406 Q406,407 2SB1132(Q,R) R471 VOLTAGE REGULATOR (AF AMP) R496 100k Q407 UMG3N Q405 IC413 AUDIO AF AMP SW TPA6201A1DRBR R459 SHUTDoWN Q405 C440 0.1u SSM6N16FE-F BYPASS C437 R489 D409 0.056u DA2S101...
  • Page 85 NX-203 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4590-14) SWITCH UNIT (X41-3840-10) CN23 AGND R20 1k 6_/KEYI0 6_/KEYI0 R21 1.2k BL_SB BL_SB R22 1k 6_KEYO1 6_KEYO1 6KEY R23 1k 6_KEYO0 6_KEYO0 R25 1.2k BL_SB R24 1k 6_KEYO2 6_KEYO2 R26 1k 6_/KEYI1 6_/KEYI1 D18,19...
  • Page 86 NX-203 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4590-14) D405,406,IC407 VOLTAGE REGULATOR (33M) DC/DC CONVERTER L402 L401 IC404 XC6204B332D-G 3.284V VOUT R438 3.82V 100k L702 IC407 R456 LT1616ES6-PBF 470k R439 D416 100k Q402 R548 47K SSM6N16FE-F D416 LEVEL CONVERTER 33A CONTROL R435 100k...
  • Page 87 NX-203 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4590-14) DC SW DC SW POWER SUPPLY CN402 7.49V Q414 Q415 EMD12 EMD12 BATT INT 7.49V 6.05V DC SW IC414 CN404 D408 XC61CC5602N-G Q408 R511 1k LED_G EMD12 LED_G DC/DC RESET CONVERTER R512 100 /EMG...
  • Page 88 NX-203 SCHEMATIC DIAGRAM TX-RX UNIT : (X57-8950-11) (A/2) R501 CN400 SWITCH UNIT LED_G LED_G (X41-3830-10) C441 47p CN401 /EMG R490 /PTT C442 47p LED_R LED_R Side_G Side_G C443 47p R500 SIDE 1 SIde_1 SIde_1 Side_2 Side_2 TX/RX LED C444 47p...
  • Page 89 NX-203 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8950-11) (A/2) /T_R Q1,2,13 R : 4.967V R : 4.66V BUFFER T : 0.37V T : 4.78V HVC131 HVC131 R : 3.265V SWITCH T : 95mV R : 2.225V 470p 470p 1000p D5,6 T : 2.4V...
  • Page 90 NX-203 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8950-11) (A/2) CN102 TH100 100k -t ° PRE-FINAL AMP Q103 RD01MUS1-T113 R : 0V DRIVE AMP T : 2.11V Q102 BUFFER AMP L105 2SK3077F C178 R124 C117 R : 4.769V R : 17.5mV T : 4.789V LOCAL SWITCH T : 1.596V...
  • Page 91 NX-203 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8950-11) (A/2) D105 R : 0.5mV ANTENNA T : 1.615V RF FINAL AMP SWITCH HVC131 L109 L110 L113 H : 2.44V L119 L118 L114 D104 Q106 C166 C136 L : 1.92V RD07MVS1BT122 1000p HVC131 C142...

  • Page 92: Block Diagram

    NX-203 BLOCK DIAGRAM Control unit (X53-4590-14) X102 18.432MHz SM5023CNDH-G IC107 TCXO IC101 IC103 Flash SRAM IC102 /DRST,DCLK,/SYMTIM,/RSSITIM, /DINT,/SWUP,FSDET,/HINT IC401 TC74LCX245FK MCD1AF,/MCSCKAF,/MCCSAF,MCD0AF,MCD1CN, BUS SW IC402 TC7WZ245FK-F /MCCXCN,/MCD0CN,/MCCSRCN,MCSCKCN D0~15,A0~20,/RD,/WR,/CS0,/CS2,/CS3,/CS4/HDS2,/HRDY /LCDRST TXD0 RXD0 IC703 RTS0 M62364FP-F(7/8) CTS0 LCDCNT /PTT IC105 /UDET XC6109C29AN- NJM2130F3-ZB...
  • Page 93 NX-203 BLOCK DIAGRAM L401 , D406 , D405 IC404 XC6204B332D IC407 LT1616ES6-PBF DCDC Converter IC717 D408 Q402 SSM6N16FE-F XC9235A15CM1 1SS301F DCDC DCSW /PSW Q408 IC414 Q401 SSM6N16FE-F EMD12 XC61CC5602NR IC406 RESET /BINT XC6204B332M IC416 S-812C31BPI-G DCSW SCTAM1 Q413 2SA1955A-F Q412 SSM3K15TE(F)
  • Page 94 NX-203 BLOCK DIAGRAM TX-RX unit (X57-8950-11) CN400 I2CCK 2SC5383-T111 I2CSDA Ripple Filter Q7 SSM6L05FU-F /T_R LM73CIMKX-0 Q9 2SJ347F Temp. Q100 Sensor SKY72300-362 2SC5636 TCXO_MOD Loop BUFF BUFF TCXO Filter X1 19.2MHz TLV2381IDBV 2SK879-F(Y) 2SC5636 Q8,10 2SK508NV(K52) D8 1SV325F BUFF D13 HVC376B...
  • Page 95 NX-203 BLOCK DIAGRAM TX/RX: 136~174MHz D104,105 D100,201 Q102 Q103 Q106 D209,211 HSC277*2 2SK3077 RD01MUS1-T113 RD07MVS1BT122 HVC131*4 Pre- Drive Final Final Q110 EMD5 Q104 DC SW DC SW /APCSW 2SC5383-T111 IC100 /DSW TA75W51FU Q105 Q107 LTC044EEBFS8 2SK1824-A DC SW Protect Q109...

  • Page 96: Level Diagram

    NX-203 LEVEL DIAGRAM...

  • Page 97: Optional Accessories

    NX-203 OPTIONAL ACCESSORIES KNB-50NC (Ni-MH Battery Pack) ■ External View ■ Specifi cations Voltage ................7 .2V Battery capacity ............2000mAh...

  • Page 98: Specifications

    Audio Distortion ..........Less than 3% 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 99 NX-203 MEMO...
  • Page 100 Communications Systems Business Unit Printed in Japan No.RQ076...
  • Page 101 NX-203 NX-203 PC BOARD PC BOARD CONTROL UNIT (X53-4590-14) CONTROL UNIT (X53-4590-14) Component side view (J79-0131-39) Component side view (J79-0131-39) CN22 CN23 /RES R406 C452 R500 CN24 J79-0131-39 Component side Layer 1 Ref. No. Address Ref. No. Address Ref. No. Address...
  • Page 102 NX-203 NX-203 PC BOARD PC BOARD CONTROL UNIT (X53-4590-14) CONTROL UNIT (X53-4590-14) Foil side view (J79-0131-39) Foil side view (J79-0131-39) R402 R735 D409 L719 R472 C712 R750 R496 R745 C429 Q405 R442 IC707 L410 R793 C717 C722 R474 R829 C767...
  • Page 103 NX-203 NX-203 PC BOARD PC BOARD TX-RX UNIT (X57-8950-11) (A/2) TX-RX UNIT (X57-8950-11) (A/2) Component side view (J79-0434-09 A/2) Component side view (J79-0434-09 A/2) C131 C152 C127 R165 C141 R144 R149 R147 R150 C143 C458 R164 Side_G R148 Side_1 C457...
  • Page 104 NX-203 NX-203 PC BOARD PC BOARD TX-RX UNIT (X57-8950-11) (A/2) TX-RX UNIT (X57-8950-11) (A/2) Foil side view (J79-0434-09 A/2) Foil side view (J79-0434-09 A/2) L112 C173 R162 C134 R163 L106 L118 R142 R137 R133 C154 L115 C130 C166 L108 TX-RX UNIT...
  • Page 105 POWER SW/ CHANNEL SWITCH UNIT AF VOL SELECTOR X41-384 6KEY/SP/MIC CORD ASSY CN403 CN23 CN404 CN400 X42-351 LED_G LED_G /EMG /EMG LED_R LED_R /SAVE /SAVE I2CCK I2CCK /5TC /5TC I2CSDA I2CSDA /T_R /T_R ASSIST ASSIST SWITCH UNIT VAGC VAGC X41-383 /RES TCXO_MOD TCXO_MOD...
  • Page 106 SWITCH UNIT (X41-3840-10) GPIo7 GPIo7 GPIo7 GPIo7 C459 DC SW DC SW L101 470p VOLTAGE REGULATOR (33M) D405,406,IC407 POWER SUPPLY CN402 ASQDET 33A-1 33A-1 C460 AGND CN23 DC/DC CONVERTER 7.49V Q414 Q415 X2_CLKIN X2_CLKIN AUD_IREFC AD12_IREFF L102 6800p VOL SW/ENC IC404 L401 L402...
  • Page 107 TX-RX UNIT : (X57-8950-11) (A/2) TH100 CN102 D105 R : 0.5mV ANTENNA R501 T : 1.615V 100k RF FINAL AMP HVC131 SWITCH CN400 L109 L110 L113 -t ° SWITCH UNIT LED_G /T_R PRE-FINAL AMP H : 2.44V Q106 L119 L118 L114 C166 D104...
  • Page 108 IC404 L401 , D406 , D405 XC6204B332D IC407 LT1616ES6-PBF X102 DCDC 18.432MHz Converter SM5023CNDH-G IC107 TCXO IC717 D408 Q402 SSM6N16FE-F XC9235A15CM1 1SS301F IC101 IC103 DCDC DCSW /PSW Flash Q408 IC414 SRAM Q401 SSM6N16FE-F IC102 EMD12 XC61CC5602NR IC406 /BINT RESET XC6204B332M IC416 S-812C31BPI-G /DRST,DCLK,/SYMTIM,/RSSITIM,...
  • Page 109 CN400 I2CCK 2SC5383-T111 I2CSDA Ripple TX/RX: 136~174MHz Filter Q7 SSM6L05FU-F /T_R LM73CIMKX-0 Q9 2SJ347F D104,105 Temp. Q100 D100,201 Q102 Q103 Q106 D209,211 Sensor SKY72300-362 2SC5636 HSC277*2 2SK3077 RD01MUS1-T113 RD07MVS1BT122 HVC131*4 Pre- TCXO_MOD Loop BUFF BUFF Drive Final Final TCXO Filter X1 19.2MHz TLV2381IDBV 2SK879-F(Y)

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