Kenwood NX-300 Service Manual
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Kenwood NX-300 Service Manual

Kenwood NX-300 Service Manual

Uhf digital transceiver
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See also: Service Manual , Instruction Manual
UHF DIGITAL TRANSCEIVER
NX-300
SERVICE MANUAL
NX-300 K3
Knob (Selector)
(K29-9408-13)
Knob (Volume)
(K29-9407-03)
Badge
(B43-1606-04)
Knob (PTT)
(K29-9405-03)
Plastic cabinet assy
(18 key)
(A02-4003-13)
Packing (18 key)
(G53-1766-11)
Does not come with antenna. Antenna is available as an option.
GENERAL ............................................................... 2
SYSTEM SET-UP ................................................... 2
REALIGNMENT ...................................................... 3
DISASSEMBLY FOR REPAIR ................................ 6
CIRCUIT DESCRIPTION ......................................... 9
COMPONENTS DESCRIPTION ........................... 15
PARTS LIST .......................................................... 17
EXPLODED VIEW ................................................. 28
PACKING .............................................................. 29
ADJUSTMENT ..................................................... 30
TERMINAL FUNCTION ........................................ 52
CONTROL UNIT (X53-4260-XX) .................... 64
TX-RX UNIT (X57-7370-10) ............................ 68
This product complies with the RoHS directive for the European market.
NX-300 K
Helical Antenna
(KRA-23:option)
CONTENTS
CONTROL UNIT (X53-4260-XX) .................... 72
TX-RX UNIT (X57-7370-10) ............................ 82
INTERCONNECTION DIAGRAM ......................... 86
BLOCK DIAGRAM ................................................ 88
LEVEL DIAGRAM ................................................. 92
KNB-47L (Li-ion BATTERY PACK) ................. 93
KNB-48L (Li-ion BATTERY PACK) ................. 93
SPECIFICATIONS .............................. BACK COVER
©
2007-10 PRINTED IN JAPAN
B51-8811-00 (S) 243
Knob (Selector)
(K29-9408-13)
Knob (Volume)
(K29-9407-03)
Badge
(B43-1606-04)
Knob (PTT)
(K29-9405-03)
Packing (6 key)
(G53-1765-11)
Plastic cabinet assy
(6 key)
(A02-4002-13)
This product uses Lead Free solder.

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  • Page 1: Table Of Contents

    UHF DIGITAL TRANSCEIVER NX-300 SERVICE MANUAL © 2007-10 PRINTED IN JAPAN B51-8811-00 (S) 243 NX-300 K3 NX-300 K Helical Antenna (KRA-23:option) Knob (Selector) Knob (Selector) (K29-9408-13) (K29-9408-13) Knob (Volume) Knob (Volume) (K29-9407-03) (K29-9407-03) Badge Badge (B43-1606-04) (B43-1606-04) Knob (PTT) Knob (PTT)

  • Page 2: General

    : components, kits, or chassis. If the part number is not known, Kenwood reserves the right to make changes to any products include the chassis or kit number of which it is a part, and a sufficient herein at any time for improvement purposes.

  • Page 3: Realignment

    NX-300 REALIGNMENT 1. Modes 2. How to Enter Each Mode Mode Operation User mode User mode Power ON Panel test mode ] + Power ON Unprogramming mode PC mode Received commands from PC Panel tuning mode Press the [ ] key, in Panel test mode...

  • Page 4: Clone Mode

    NX-300 REALIGNMENT 5-2. Connection procedure 6-3. Programming 1. Connect the transceiver to the computer using the inter- 1. Start up the firmware programming software (Fpro.exe face cable and USB adapter (When the interface cable is (version 4.0 or later)) KPG-36A, the KCT-53U can be used.).
  • Page 5 NX-300 REALIGNMENT Notes: Key guide on the Read authorization password input screen. • CONFRM ([ ] key):The password confirmation • Cannot be cloned if the password (overwrite password) is • DELETE ([ ] key): Delete the least digit from the current programmed to the target.

  • Page 6: Disassembly For Repair

    NX-300 DISASSEMBLY FOR REPAIR 1. Precautions for Waterproof • Do not remove the black sheet from the reverse side of the transceiver (refer to the illustration right). Removal of this sheet decreases the waterproof efficiency of the transceiver and may cause malfunctions if water seeps into the transceiver.
  • Page 7 NX-300 DISASSEMBLY FOR REPAIR 2. Mount the chassis onto the case 3. Precautions for Reassembly ■ Mounting the chassis onto the case Note: 1. Place the key top on the chassis. Then, fit the chassis After mounting the chassis onto the case, if the 18 key...
  • Page 8 NX-300 DISASSEMBLY FOR REPAIR ■ Forming the VOL/CH FPC, Cord ASSY and ■ Installing lithium cell (W09-0971-05) Universal connector FPC 1. Insert a lithium cell into one side of the socket (CN401). 2. Push the lithium cell with your fingers as shown in the Form the VOL/CH FPC, Cord ASSY and Universal figure to insert the lithium cell into the socket.

  • Page 9: Circuit Description

    CIRCUIT DESCRIPTION 1. Overview 2. Frequency Configuration The NX-300 is a UHF portable transceiver designed to The receiver is a double-conversion superheterodyne operate in the frequency range of 450 to 520MHz. The unit using the first intermediate frequency (IF) of 58.05MHz and consists of receiver, transmitter, phase-locked loop (PLL) the second IF of 450kHz.
  • Page 10 NX-300 CIRCUIT DESCRIPTION 3-3. Audio Amplifier Circuit Q406 Audio processing (high-pass filter, low-pass filter, de-em- phasized and so on) at FM mode and decoding at NXDN Q407 mode are processed by DSP. The audio signal from IC108 INAMT and IC102 goes through the amplifier (IC704). The signal then goes through a mute switch (IC707), amplifier (IC713), elec- tronic volume control (IC703), and AF amplifier (IC408).
  • Page 11 NX-300 CIRCUIT DESCRIPTION 4-3. VOX 4-5. APC Circuit IC716 (2/2) amplifies 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 amplifier (Q606) and keeps a constant rectified by D706.
  • Page 12 NX-300 CIRCUIT DESCRIPTION 5-3. PLL IC (IC502) The desired frequency is set for the PLL IC by the ASIC (IC108) through the 3-line "SDO1", "SCK1", "/PCS_RF" serial The PLL IC compares the differences in phases of the bus. Whether the PLL IC is locked or not is monitored by the VCO oscillation frequency and the VCTCXO reference ASIC through the “PLD”...
  • Page 13 NX-300 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 flash memory (IC101). The flash 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 oper-...
  • Page 14 NX-300 CIRCUIT DESCRIPTION TX-RX unit (X57) 8. Signaling Circuit F900 RF Final AMP 8-1. Encode (QT/DQT/LTR/DTMF/2-tone/MSK) Each signaling data signal of QT, DQT, LTR, DTMF, 2-tone 2.5A IC902 /SAVE and MSK is generated by the DSP circuit, superposed on a modulation signal and output from IC108.

  • Page 15: Components Description

    NX-300 COMPONENTS DESCRIPTION Control unit (X53-4260-XX) Ref. No. Part Name Description Q403 Transistor SB2 switch Ref. No. Part Name Description Q404 SB2 switch control LCD contrast Q405 AF AMP switch IC101 FLASH ROM Q406,407 Transistor Voltage regulator (AF AMP) IC102...
  • Page 16 NX-300 COMPONENTS DESCRIPTION TX-RX unit (X57-7370-10) Ref. No. Part Name Description D506,507, Variable Frequency control Ref. No. Part Name Description D510,511 capacitance diode IC404 OP AMP (RSSI/VAGC) D514~517 Variable Frequency control IC500 Temperature sensor capacitance diode IC501 DC AMP for TCXO MOD...

  • Page 17: Parts List

    E: Europe Les articles non mentionnes dans le Parts No. ne sont pas fournis. Y: AAFES (Europe) X: Australia M: Other Areas Teile ohne Parts No. werden nicht geliefert. NX-300 (Y50-6120-XX) CONTROL UNIT (X53-4260-XX) Ref. No. Address Parts No. Description Destination Ref.
  • Page 18 NX-300 PARTS LIST CONTROL UNIT (X53-4260-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts C131 CK73HB1A104K CHIP C 0.10UF K C466 CK73HB1E682K CHIP C 6800PF K C467,468 CK73HB1E103K CHIP C 0.010UF K...
  • Page 19 NX-300 PARTS LIST CONTROL UNIT (X53-4260-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts C780 CK73HB1A224K CHIP C 0.22UF K RK73HB1J331J CHIP R J 1/16W C781,782 CK73HB0J105K CHIP C 1.0UF RK73HB1J000J CHIP R...
  • Page 20 NX-300 PARTS LIST CONTROL UNIT (X53-4260-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts R174-178 RK73HB1J104J CHIP R 100K J 1/16W R471 RK73HB1J000J CHIP R J 1/16W R180,181 RK73HB1J104J CHIP R 100K...
  • Page 21 NX-300 PARTS LIST CONTROL UNIT (X53-4260-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts R740 RK73HB1J000J CHIP R J 1/16W R813 RK73HB1J273J CHIP R J 1/16W R741 RK73HB1J474J CHIP R 470K J 1/16W...
  • Page 22 NX-300 PARTS LIST CONTROL UNIT (X53-4260-XX) TX-RX UNIT (X57-7370-10) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts ∗ D707 DA221 DIODE Q411 SSM6N16FE-F LMC7101BIM5 MOS-IC Q412 SSM3K15TE(F) IC101 Note 1 ROM IC...
  • Page 23 NX-300 PARTS LIST TX-RX UNIT (X57-7370-10) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts C668 CC73GCH1H080B CHIP C 8.0PF C572 CK73FB0J106K CHIP C 10UF C669 CC73GCH1H040B CHIP C 4.0PF C573 CC73HCH1H050B CHIP C 5.0PF...
  • Page 24 NX-300 PARTS LIST TX-RX UNIT (X57-7370-10) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts C770 CC73HCH1H040B CHIP C 4.0PF C970,971 CK73HB1H102K CHIP C 1000PF K C771 CK73HB1H471K CHIP C 470PF C972-974 CK73GB1E105K CHIP C 1.0UF...
  • Page 25 NX-300 PARTS LIST TX-RX UNIT (X57-7370-10) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts ∗ X500 L77-3016-05 TCXO (19.2M/4P/12) R606 RK73HB1J331J CHIP R J 1/16W ∗ XF700 L71-0640-05 (58.05MHZ/16) R607 RK73HB1J222J CHIP R 2.2K...
  • Page 26 NX-300 PARTS LIST TX-RX UNIT (X57-7370-10) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts R721 RK73HB1J103J CHIP R J 1/16W R799 RK73HB1J000J CHIP R J 1/16W R722 RK73HB1J472J CHIP R 4.7K J 1/16W...
  • Page 27 NX-300 PARTS LIST TX-RX UNIT (X57-7370-10) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts IC901 XC9101D09AKR ANALOGUE IC IC902 TK11250CUCB MOS-IC ∗ IC903 TK71733S BI-POLAR IC Q503 2SC5383-T111 TRANSISTOR ∗ Q504 2SK879-F(Y)

  • Page 28: Exploded View

    NX-300 EXPLODED VIEW Control unit (X53) Option board unit (X57 B/2) TX-RX unit (X57 A/2) A :N08-0564-04 B :N09-2426-14 C :N09-2440-15 D :N09-6549-04 E :N09-6554-05 F :N14-0844-04 G :N30-3008-60 H :N83-2005-48 Parts with the exploded numbers larger than 700 are not supplied.

  • Page 29: Packing

    NX-300 PACKING 46. BELT CLIP 4. CAP (J29-0730-05) (B09-0712-03) 40. PACKING(CAP) (G11-1769-04) G. PAN HEAD MACHINE SCREW (N30-3008-60)x2 A. DRESSED SCREW (N08-0564-04) 11. INSTRUCTION MANUAL (B62-2014-00) Parts with the exploded numbers larger than 700 are not supplied.

  • Page 30: Adjustment

    NX-300 ADJUSTMENT Fault diagnosis of the BGA IC Overview: A flowchart 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-300 ADJUSTMENT When a normal value is confirmed. ● Checking the output signal 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/FALSH/SRAM may be broken.
  • Page 32 NX-300 ADJUSTMENT Controls [PTT] Transmit Use as the DTMF keypad. Selector [0] to [9] If a key is pressed during Power switch / Volume transmission, the DTMF Orange key [#], [ corresponding to the key that was presses is sent.
  • Page 33 NX-300 ADJUSTMENT ■ Frequency and Signaling • NXDN mode signaling The transceiver has been adjusted for the frequencies shown in the following table. When required, readjust them RAN1 RAN1 following the adjustment procedure to obtain the frequencies you want in actual operation.
  • Page 34 NX-300 ADJUSTMENT ■ Key operation ■ 5 reference level adjustments frequency Function Tuning point RX (MHz) TX (MHz) Push Hold (1 second) 450.05000 450.10000 [Selector] Low’ 467.55000 467.60000 Adjustment value up Continuation up Center 485.05000 485.10000 Adjustment value down Continuation down High’...
  • Page 35 NX-300 ADJUSTMENT Order Adjustment item Main LCD display Sub LCD display Adjustment range QT Deviation 1~1024 DQT Deviation 1~1024 LTR Deviation 1~1024 DTMF Deviation DTMF 1~1024 Single Tone TONE Deviation 1~1024 MSK Deviation 1~1024 CW ID Deviation CWID 1~1024 1 point ADJ...
  • Page 36 NX-300 ADJUSTMENT ■ Panel tuning mode flow chart Panel Test Mode ]hold LCD Contrast Adjustment Item N/W/VN CNTR LCD Display ]press [ ]hold For all adjustment items, press the ] key to write the adjustment value. Volume 1(CCW Max) VOL1...
  • Page 37 In order to turn the volume nut and the channel selector voltage drop may occur within the power cable, between the nut, use a recommendation tool. power supply and the battery jig, especially while the KENWOOD part No. : W05-1123-00 transceiver transmits. SCHEMATIC DIAGRAM 3. Battery Jig (W05-1370-00) –...
  • Page 38 NX-300 ADJUSTMENT 4. Universal connector • PC tuning Use the interface cable (KPG-36/36A) for PC tuning or the Connect the wires to the PCB in the connector case of lead wire with plug (E30-3287-18) and screw (N08-0535-08) interface cable. for panel tuning. Connect the plug to the universal connector For output the wires out of the connector case, need to of the transceiver and tighten the screw.
  • Page 39 NX-300 ADJUSTMENT Radio Check Section Condition Measurement Adjustment Item Specifications/ Test- Panel test mode PC test mode Unit Terminal Unit Parts Method equipment Remarks 1. Frequency 1) CH-Sig : 1-1 1) Test Channel f. counter Panel Check an internal +0.05/+0.55ppm...
  • Page 40 NX-300 ADJUSTMENT Condition Measurement Adjustment Item Specifications/ Test- Panel test mode PC test mode Unit Terminal Unit Parts Method equipment Remarks 5. Sensitivity 1) CH-Sig : 1-1 1) Test Channel Panel Check 12dB SINAD or check SSG output Channel : 1...
  • Page 41 NX-300 ADJUSTMENT Condition Measurement Adjustment Item Specifications/ Test- Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment Remarks 5. Assist 1) Adj item:[RAST] 1) Adj item:[Receive Panel [Panel The sub LCD display 2.5V± 0.1V voltage Adjust:[****] Assist]...
  • Page 42 NX-300 ADJUSTMENT Transmitter Section Condition Measurement Adjustment Item Specifications/ Test- Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment Remarks ± 0.2W 1. High power 1) Adj item:[HIPWR] 1) Adj item: [High Power Panel Panel [Panel 5.0W...
  • Page 43 NX-300 ADJUSTMENT Condition Measurement Adjustment Item Specifications/ Test- Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment Remarks 4. NXDN 1) Adj item:[Nn NDEV] 1) Adj item:[ Maximum Deviation Panel Panel [Panel 3056Hz 2995~3117Hz Deviation Adjust:[****] Deviation(NXDN...
  • Page 44 NX-300 ADJUSTMENT Condition Measurement Adjustment Item Specifications/ Test- Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment Remarks 6. QT Deviation 1) Adj item:[An QT] 1) Adj item:[QT Deviation Deviation Panel Panel [Panel Write the value as 0.35kHz±...
  • Page 45 NX-300 ADJUSTMENT Condition Measurement Adjustment Item Specifications/ Test- Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment Remarks 9. DTMF 1) Adj item:[An DTMF] 1) Adj item:[DTMF Deviation Panel Panel [Panel Write the value as 1.25kHz±0.05kHz Deviation...
  • Page 46 NX-300 ADJUSTMENT Condition Measurement Adjustment Item Specifications/ Test- Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment Remarks 13.VOX 1 1) Adj item:[VOX1] 1) Adj item:[VOX1] Panel Universal [Panel tuning mode] adjust Adjust:[***] AG : 1kHz/45mV at...
  • Page 47 NX-300 ADJUSTMENT Receiver Section Condition Measurement Adjustment Item Specifications/ Test- Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment Remarks 1. AF level [Panel test mode] 1) Test Channel Panel Panel Volume Turn the Volume 0.63V± 0.1V...
  • Page 48 NX-300 ADJUSTMENT Condition Measurement Adjustment Item Specifications/ Test- Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment Remarks 4. RSSI 1) Adj item:[An RRSSI] 1) Adj item:[RSSI Panel [Panel tuning mode] reference Adjust:[***] Reference(Analog AF VTVM Universal...
  • Page 49 NX-300 ADJUSTMENT Condition Measurement Adjustment Item Specifications/ Test- Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment Remarks 5. Squelch 1) Adj item:[An SQL] 1) Adj item:[Open Panel [Panel tuning mode] (Open) Adjust:[***] Squelch (Analog AF VTVM...
  • Page 50 NX-300 ADJUSTMENT Condition Measurement Adjustment Item Specifications/ Test- Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment Remarks 6. RSSI at 1) Adj item:[An LRSSI] 1) Adj item:[Low RSSI Panel [Panel tuning mode] -118dBm Adjust:[***] (Analog Narrow)]...
  • Page 51 NX-300 ADJUSTMENT Condition Measurement Adjustment Item Specifications/ Test- Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment Remarks 7. RSSI at 1) Adj item:[An HRSSI] 1) Adj item:[High RSSI Panel [Panel tuning mode] -80dBm Adjust:[***] (Analog Narrow)]...

  • Page 52: Terminal Function

    NX-300 TERMINAL FUNCTION Control unit (X53-4260-XX) Pin No. Name Function Power output after passing through the fuse Pin No. Name Function Power input after power switch CN404 Chip select output LED_G Green LED control output /RES LCD reset output /EMG...
  • Page 53 NX-300 TERMINAL FUNCTION Pin No. Name Function Pin No. Name Function RFAGC RF AGC control output RXEO SCK1 PLL clock output RXEI Refer to “CN710 26-pin connector specification” S_DET Battery select input OPT6 described on pages 56 to 59. No connection...
  • Page 54 NX-300 TERMINAL FUNCTION Option board unit (X57-7370-10 B/2) Pin No. Name Function /DSW APC voltage discharge switch control input Pin No. Name Function APC control input CN737 /APCSW APC switch control input OPT1 VCO_MOD VCO modulation input OPT3 Thermistor voltage output...
  • Page 55 NX-300 TERMINAL FUNCTION Universal connector Signal Rating and Condition Pin No. Name Function Type Parameter Unit EXT/INT speaker switch input. Digital L: External speaker ON H: Internal speaker ON [ 8Ω load ] Max output power Analog BTL output + for external speaker.
  • Page 56 NX-300 TERMINAL FUNCTION CN710 26-pin connector specification Rating and Condition Pin No. Name Signal Type Parameter Unit [Input] OPT1 OPT4 OPT5 Digital [Output] OPT8 OPT11 [Input] OPT3 OPT7 Digital OPT2 [Output] OPT6 [Input] 26P_RD Digital Baud rate 19200 [Output] 26P_TD...
  • Page 57 NX-300 TERMINAL FUNCTION Rating and Condition Pin No. Name Signal Type Parameter Unit Output Amplitude (1kHz, 60% deviation) while external MIC mVp-p while internal MIC mVp-p Analog Coupling Capacitor Ω Output Impedance 2.2k Allowable Frequency 3000 Output Amplitude (1kHz, 60% deviation)
  • Page 58 NX-300 TERMINAL FUNCTION CN710 26-pin connector specification Pin No. Name Device Conection Function [COR] Conv/LTR L: Not activity receiving H: Activity receiving [TOR] Conv/LTR L: Not activity receiving ANI board Aux Input H: Activity receiving (Sub Tone or LTR ID is OK)
  • Page 59 NX-300 TERMINAL FUNCTION Pin No. Name Device Conection Function ANI board Data Out Data signal input VGS-1 ANI board Tone Control Speaker mute signal input OPT8 VGS-1 ANI board Man-Down Man-Down output OPT11 VGS-1 ANI board MIC Mute MIC mute signal input...
  • Page 60 NX-300 TERMINAL FUNCTION CN737 Option board connector specification Rating and Condition Pin No. Name Signal Type Parameter Unit [Input] OPT1 OPT4 OPT5 Digital [Output] OPT8 OPT11 [Input] OPT3 OPT7 Digital OPT2 [Output] OPT6 [Input] 26P_RD Digital Baud rate 19200 [Output]...
  • Page 61 NX-300 TERMINAL FUNCTION Rating and Condition Pin No. Name Signal Type Parameter Unit Output Amplitude (1kHz, 60% deviation) mVp-p Coupling Capacitor RXEO Analog Ω Output Impedance 2.2k Allowable Frequency 3000 Input Amplitude (1kHz, 60% deviation) mVp-p Coupling Capacitor RXEI Analog Ω...
  • Page 62 NX-300 TERMINAL FUNCTION CN737 Option board connector specification Pin No. Name Device Conection Function [COR] Conv/LTR L: Not activity receiving H: Activity receiving [TOR] Conv/LTR L: Not activity receiving ANI board Aux Input H: Activity receiving (Sub Tone or LTR ID is OK)
  • Page 63 NX-300 TERMINAL FUNCTION Pin No. Name Device Conection Function ANI board Data Out Data signal input VGS-1 ANI board Tone Control Speaker mute signal input OPT8 VGS-1 ANI board Man-Down Man-Down output OPT11 VGS-1 ANI board MIC Mute MIC mute signal input...

  • Page 64: Pc Board

    NX-300 PC BOARD CONTROL UNIT (X53-4260-XX) -10: K, -11: K3 Component side view (J79-0131-19) J79-0131-19 Ref. No. Address Ref. No. Address Ref. No. Address IC415...
  • Page 65 NX-300 PC BOARD CONTROL UNIT (X53-4260-XX) -10: K, -11: K3 Component side view (J79-0131-19) CN22 CN23 /RES R406 C452 R500 CN24 Component side Layer 1 Layer 2 Layer 3 Layer 4 Layer 5 Layer 6 Foil side...
  • Page 66 NX-300 PC BOARD CONTROL UNIT (X53-4260-XX) -10: K, -11: K3 Foil side view (J79-0131-19) R402 D409 R472 C410 R496 R117 R442 C429 Q405 L410 R474 C440 IC413 C415 + IC405 R462 L401 R133 R489 C437 C416 R132 R471 C438 R490...

  • Page 67: Pc Board Control Unit (X53-4260-Xx)

    NX-300 PC BOARD CONTROL UNIT (X53-4260-XX) -10: K, -11: K3 Foil side view (J79-0131-19) R735 Q102 Q101 C712 R750 R117 R114 R112 R745 IC707 C115 R106 R793 C717 C722 R829 C767 R758 R755 R108 R753 C745 L710 C108 C118 D101...

  • Page 68: Tx-Rx Unit (X57-7370-10)

    NX-300 PC BOARD TX-RX UNIT (X57-7370-10) (A/2) Component side view (J79-0128-19 A/2) C630 C646 R541 R537 C640 R648 R652 R651 R530 R531 C534 R653 C641 R641 R654 Q607 R655 C542 Q608 C653 R659 R533 R660 R657 C536 R664 R658 R532...
  • Page 69 NX-300 PC BOARD TX-RX UNIT (X57-7370-10) (A/2) Component side view (J79-0128-19 A/2) C640 R648 R651 C641 C945 Side_G R654 Side_1 C971 C943 Side_2 C636 R655 TX-RX UNIT C913 C976 R921 (X57-7370-10) (B/2) Q608 R922 Q905 R659 R660 C964 D901 RXEO...
  • Page 70 NX-300 PC BOARD TX-RX UNIT (X57-7370-10) (A/2) Foil side view (J79-0128-19 A/2) C654 L614 TX-RX UNIT (X57-7370-10) (B/2) C668 C665 J79-0128-19 B/2 L612 C663 CN600 C662 C664 D709 26 POW OPT6 C803 RXEI D711 R915 L725 RXEO OPT2 OPT7 OPT11...
  • Page 71 NX-300 PC BOARD TX-RX UNIT (X57-7370-10) (A/2) Foil side view (J79-0128-19 A/2) C645 L610 C643 C547 R544 C648 R545 L508 C642 C548 R646 R542 C556 C632 C635 C557 D515 Q606 D517 Q603 L518 L519 C568 C566 C567 C565 C575 L521...

  • Page 72: Schematic Diagram

    NX-300 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4260-XX) -7.24V R406 /LCDRST IC402 LCD CONTRAST R407 TC7WZ245FK-F LMC7101BIM5 INPUT- INPUT+ R408 IC401 TC74LCX245FK 3.28V 5 V- OUTPUT -7.13V C402 0.1u C405 /CS4 2.2u16 IC401,402 IC403 -9.74V LM2682MMX BUS SW C403 4.92V 2.2u16 R409...
  • Page 73 NX-300 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4260-XX) 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 74 NX-300 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4260-XX) GPIo7 ASQDET AUD_IREFC X2_CLKIN AD12_IREFF R158 XTALI XTALo CN104 DSPCK /RINT USRCKI ADD0 ADD1 ADD2 ADD3 ADD4 ADD5 ADD6 ADD7 ADD8 L713 ADD9 ADD10 IC107 BUFFER SM5023CNDH-G ADD11 X102 ADD12 18.432MHz ADD13 C130 oUTPUT ADD14 0.01u...
  • Page 75 NX-300 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4260-XX) GPIo7 GPIo7 33A-1 IC108 ASIC R470 IFADCN 33MAS 33MAS 33A-1 33A-1 SPCS10 SPCS10 RESET X53-426 4/10...
  • Page 76 NX-300 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4260-XX) C459 GPIo7 L101 470p 33A-1 C460 L102 VOL SW/ENC 6800p C461 POWER SW/AF VOL 470p DGND3 CN403 DGND2 R501 DGND1 2.2k L714 R506 VOL_GND DVDIo7 L403 2.2k DVDIo6 L716 DVDIo5 R510 CHANNEL SELECTOR ENC3...
  • Page 77 NX-300 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4260-XX) D702 R819 MA2S111-F R790 CONTROL ASQDET Q701 R798 100k 2SA1832(GR)F C719 C755 47p OPT10 0.1u R803 OPT SW R747 ASQ DET NOISE ASQAPC IC711 DETECTOR TC75W51FK(F) D705 R824 SQL BPF/ RB706F-40 R739 C716 BPF/SQL DC AMP...
  • Page 78 NX-300 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4260-XX) 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 0.22u MA2S111-F...
  • Page 79 NX-300 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4260-XX) SWITCH UNIT (X41-3720-10) 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 80 NX-300 SCHEMATIC DIAGRAM CONTROL UNIT (X53-4260-XX) D405,406,IC407 DC/DC CONVERTER VOLTAGE L402 CONTROL REGULATOR (33M) L401 L410 D416 IC404 XC6204B332M 1SS388F R438 R548 3.284V 3.82V 100k IC407 R456 L702 LT1616ES6-PBF VOUT 470k R439 100k 3.82V Q402 SSM6N16FE-F IC405 LEVEL CONVERTER 3.82V 1.5V...
  • Page 81 NX-300 SCHEMATIC DIAGRAM ● Note : The components marked with a dot ( ) are parts of layer 1. CONTROL UNIT (X53-4260-XX) DC SW DC SW POWER SUPPLY CN402 7.49V Q414 Q415 EMD12 EMD12 BATT INT 7.49V 6.05V DC SW...

  • Page 82: Tx-Rx Unit (X57-7370-10)

    NX-300 SCHEMATIC DIAGRAM TX-RX UNIT (X57-7370-10) (A/2) CN900 SWITCH UNIT LED_G (X41-3710-10) LED_G CN901 C904 47p R928 /EMG C905 47p Side_G LED_R Side_G LED_R SIDE 1 Side_1 C906 47p Side_1 TX/RX LED TX/RX LED Side_2 Side_2 SWITCH R : 100mV...
  • Page 83 NX-300 SCHEMATIC DIAGRAM TX-RX UNIT (X57-7370-10) (A/2) /T R C543 R : 4.94V T : 4.98V R : 1.1V L504 C525 C553 T : 1.27V R : 0.79V C588 T : 0.81V Q505 2SC5636 BUFFER AMP IC500 TEMP SENSOR LM73CIMKX-0...
  • Page 84 NX-300 SCHEMATIC DIAGRAM TX-RX UNIT (X57-7370-10) (A/2) CN600 TH600 100k RF AMP Q602 L605 2SK3077F C621 R628 R620 C670 R : 5mV RF AMP T : 0.64V R : 4.75V R : 2.5mV 6.8n 470p Q601 BUFFER AMP T : 4.8V LOCAL SWITCH T : 2.37V...
  • Page 85 NX-300 SCHEMATIC DIAGRAM ● Note : The components marked with a dot ( ) are parts of layer 1. TX-RX UNIT (X57-7370-10) (A/2) R : 0.5mV RF FINAL AMP ANTENNA SWITCH T : 1.615V Q606 D606 L612 L613 L614 Strip line...

  • Page 86: Interconnection Diagram

    NX-300 INTERCONNECTION DIAGRAM 6KEY/SP/MIC SWITCH UNIT POWER SW/ CHANNEL X41-372 AF VOL SELECTOR CN403 CN23 /RES CONTROL PCB X53-426 CN405 CN710 CN701 CN737 UNIVERSAL CONNECTOR X57-737 B/2 OPTION PCB...
  • Page 87 NX-300 INTERCONNECTION DIAGRAM CORD ASSY X42-334 CN404 CN900 LED_G LED_G /EMG /EMG LED_R LED_R /SAVE /SAVE I2CCK I2CCK /5TC /5TC I2CSDA I2CSDA /T_R /T_R SWITCH UNIT ASSIST ASSIST X41-371 VAGC VAGC TCXO_MOD TCXO_MOD CN901 PGND RSSI RSSI PGND TX-RX PCB...

  • Page 88: Block Diagram

    NX-300 BLOCK DIAGRAM X53-4260-XX (Control unit) X102 18.432MHz SM5023CNDH-G IC107 TCXO IC101 IC103 Flash SRAM IC102 /DRST,DCLK,/SYMTIM, /RSSITIM,/DINT, /SWUP,FSDET,/HINT MCD1AF,/MCSCKAF,/MCCSAF,MCD0AF, IC401 TC7MZ245FK BUS SW MCD1CN,/MCCXCN,/MCD0CN,/ IC402 TC7WZ245FK-F 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 IC403 IC105...
  • Page 89 NX-300 BLOCK DIAGRAM IC404 L401 , D406 , D405 XC6204B332M IC407 LT1616ES6-PBF DCDC Converter IC405 D408 Q402 SSM6N16FE-F XC6205B152PRN 1SS301F /PSW DCSW Q408 IC414 Q401 SSM6N16FE-F EMD12 XC61CC5602NR IC406 /BINT RESET XC6204B332M IC416 S-812C31BPI-G SCTAM1 DCSW Q413 2SA1955A-F Q412 SSM3K15TE(F)
  • Page 90 NX-300 BLOCK DIAGRAM X57-7370-10 (TX-RX unit) CN900 Q507 I2CCK 2SC5383-T111 I2CSDA Ripple Filter IC500 Q510 SSM6L05FU /T_R LM73CIMKX-0 Q511 2SJ347F Temp. Q600 IC502 Sensor 2SC5636 TCXO_MOD Loop BUFF BUFF TCXO Filter IC501 X500 19.2MHz LMC7101BIM5 Q504 Q512 2SK879(Y)F 2SC5636 Q508,509 2SK508NV(K52)
  • Page 91 NX-300 BLOCK DIAGRAM TX/RX: 450~520MHz D606,607 D600,601 Q601 Q602 Q603 Q606 D709,711 HSC277*2 2SC5636 2SK3077F RD01MUS1 RD07MVS1B HVC131*4 Pre- Pre- Drive Final Drive Final Q610 EMD5 Q604 DC SW DC SW /APCSW 2SC5383-T111 IC600 /DSW TA75W01FUF 150C Q607 Q608 DTC144EE...

  • Page 92: Level Diagram

    NX-300 LEVEL DIAGRAM...

  • Page 93: Optional Accessories

    NX-300 OPTIONAL ACCESSORIES KNB-47L (Li-ion BATTERY PACK) KNB-48L (Li-ion BATTERY PACK) ■ External View ■ External View ■ Specifications ■ Specifications Voltage ....7.4V Voltage ....7.4V Battery capacity ... 1950mAh Battery capacity ... 2550mAh ■ Schematic Diagram ■ Schematic Diagram...

  • Page 94: Specifications

    Modulation ............... 16K0F3E, 11K0F3E, 8K30F1E, 8K30F1D, 8K30F7W, 4K00F1E, 4K00F1D, 4K00F7W, 4K00F2D Analog measurements made per TIA/EIA 603 KENWOOD reserves the right to change specifications without prior notice or obligation. 2967-3, Ishikawa-machi, Hachioji-shi, Tokyo, 192-8525 Japan P.O. BOX 22745, 2201 East Dominguez Street, Long Beach, Amsterdamseweg 37, 1422 AC Uithoorn, The Netherlands CA 90801-5745, U.S.A.
  • Page 95 NX-300 NX-300 PC BOARD PC BOARD CONTROL UNIT (X53-4260-XX) -10: K, -11: K3 CONTROL UNIT (X53-4260-XX) -10: K, -11: K3 Component side view (J79-0131-19) Component side view (J79-0131-19) CN22 CN23 /RES R406 C452 R500 CN24 J79-0131-19 Component side Layer 1 Ref.
  • Page 96 NX-300 NX-300 PC BOARD PC BOARD CONTROL UNIT (X53-4260-XX) -10: K, -11: K3 CONTROL UNIT (X53-4260-XX) -10: K, -11: K3 Foil side view (J79-0131-19) Foil side view (J79-0131-19) R402 R735 D409 R472 Q102 Q101 C712 C410 R750 R496 R117 R114...
  • Page 97 NX-300 NX-300 PC BOARD PC BOARD TX-RX UNIT (X57-7370-10) (A/2) TX-RX UNIT (X57-7370-10) (A/2) Component side view (J79-0128-19 A/2) Component side view (J79-0128-19 A/2) C630 C646 R541 R537 C640 R648 R652 R651 R530 R531 C534 R653 C641 R641 C945 Side_G...
  • Page 98 NX-300 NX-300 PC BOARD PC BOARD TX-RX UNIT (X57-7370-10) (A/2) TX-RX UNIT (X57-7370-10) (A/2) Foil side view (J79-0128-19 A/2) Foil side view (J79-0128-19 A/2) C645 L610 C643 C547 R544 C648 R545 L508 C642 C654 C548 R646 R542 C556 C632 C635...
  • Page 99 NX-300 SCHEMATIC DIAGRAM Note : The components marked with a dot ( ● ) are parts of layer 1. TX-RX UNIT (X57-7370-10) (A/2) C459 SWITCH UNIT (X41-3720-10) TH600 CN600 R : 0.5mV GPIo7 GPIo7 GPIo7 GPIo7 L101 470p D405,406,IC407 POWER SUPPLY...
  • Page 100 NX-300 NX-300 INTERCONNECTION DIAGRAM INTERCONNECTION DIAGRAM 6KEY/SP/MIC SWITCH UNIT POWER SW/ CHANNEL X41-372 AF VOL SELECTOR CORD ASSY X42-334 CN404 CN900 CN403 CN23 LED_G LED_G /EMG /EMG LED_R LED_R /SAVE /SAVE I2CCK I2CCK /5TC /5TC I2CSDA I2CSDA /T_R /T_R SWITCH UNIT...
  • Page 101 NX-300 NX-300 BLOCK DIAGRAM BLOCK DIAGRAM X53-4260-XX (Control unit) IC404 L401 , D406 , D405 XC6204B332M IC407 LT1616ES6-PBF DCDC X102 SM5023CNDH-G 18.432MHz Converter IC107 TCXO IC405 D408 Q402 SSM6N16FE-F XC6205B152PRN 1SS301F IC101 IC103 /PSW DCSW Flash Q408 IC414 SRAM Q401 SSM6N16FE-F...
  • Page 102 NX-300 NX-300 BLOCK DIAGRAM BLOCK DIAGRAM X57-7370-10 (TX-RX unit) CN900 Q507 I2CCK 2SC5383-T111 TX/RX: 450~520MHz I2CSDA Ripple Filter IC500 Q510 SSM6L05FU /T_R LM73CIMKX-0 Q511 2SJ347F D606,607 Temp. Q600 D600,601 Q601 Q602 Q603 Q606 D709,711 Sensor IC502 2SC5636 HSC277*2 2SC5636 2SK3077F...

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