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Kenwood NX-900 Service Manual

800mhz digital transceiver
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Download this manual See also: Instruction Manual
800MHz DIGITAL TRANSCEIVER
NX-900
SERVICE MANUAL
Metallic cabinet
(A01-2194-11)
Modular jack
(E58-0522-05)
RF coaxial receptacle (N)
(E04-0170-15)
GENERAL .....................................................2
SYSTEM SET-UP .........................................4
REALIGNMENT ...........................................5
INSTALLATION ............................................7
DISASSEMBLY FOR REPAIR ....................14
CIRCUIT DESCRIPTION ............................17
COMPONENTS DESCRIPTION .................23
PARTS LIST ...............................................26
EXPLODED VIEW ......................................39
PACKING ....................................................40
TROUBLE SHOOTING ..............................41
This product complies with the
RoHS
CONTENTS
directive for the European market.
© 2011-1 PRINTED IN JA PAN
B51-8951-00 ( N ) 469
Key top
Panel assy
(K29-9401-03)
(A62-1162-12)
Packing (Phone jack)
(G53-1616-03)
Packing (D-sub outer)
(G53-1626-03))
DC cord (Pig tail)
(E30-7520-25)
ADJUSTMENT ..........................................44
TERMINAL FUNCTION .............................66
DISPLAY UNIT (X54-3680-10) ...............76
INTERCONNECTION DIAGRAM ..............83
SCHEMATIC DIAGRAM ............................84
LEVEL DIAGRAM ....................................100
BLOCK DIAGRAM ...................................102
SPECIFICATIONS ....................................107
This product uses Lead Free solder.

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  • Page 1: Table Of Contents

    800MHz DIGITAL TRANSCEIVER NX-900 SERVICE MANUAL © 2011-1 PRINTED IN JA PAN B51-8951-00 ( N ) 469 Metallic cabinet Key top Panel assy (A01-2194-11) (K29-9401-03) (A62-1162-12) Modular jack (E58-0522-05) Packing (Phone jack) (G53-1616-03) Packing (D-sub outer) (G53-1626-03)) RF coaxial receptacle (N)

  • Page 2: General

    Neither is any liability assumed for dam- the fi rmware under the license of Digital Voice Systems, Inc. ages resulting from the use of the information contained herein. Kenwood reserves the right to make changes to any products herein at any time for improvement purposes. GENERAL...
  • Page 3 D-sub Antenna on many factors and is beyond the scope of this manual. connector jack cap Your KENWOOD dealer can help you select an antenna sys- tem that will best serve your particular needs. Ignition sense cable 4-2. Radio location...

  • Page 4: System Set-Up

    NX-900 SYSTEM SET-UP Frequency range RF power Type Merchandise received RX 851~870MHz TX 806~825MHz NX-900 K 851~870MHz Choose the type of transceiver Are you using See page 9. KRK-10 the remote kit? (Option) Are you using See page 7. KCT-46...

  • Page 5: Realignment

    NX-900 REALIGNMENT 1. Modes 5. PC Mode 5-1. Preface User mode The transceiver is programmed by using a personal com- puter, programming interface (KPG-46/46A) and program- Panel test mode Panel tuning mode ming software (KPG-111D: ver. 2.30 or later). The programming software can be used with a PC. Fig- ure 1 shows the setup of a PC for programming.
  • Page 6 NX-900 REALIGNMENT 5-3. KPG-46/KPG-46A description 7. If writing ends successfully, the checksum is calculated and a result is displayed. (PC programming interface cable: Option) 8. If you want to continue programming other transceivers, The KPG-46/46A is required to interface the transceiver repeat steps 4 to 7.

  • Page 7: Installation

    NX-900 REALIGNMENT 7. The other slave can be continuously cloned. When the • How to enter the password with the microphone key- [ ] key on the master is pressed while the master dis- pad; plays “END”, the master displays “CLONE MODE”.
  • Page 8 NX-900 INSTALLATION 5. Place the relay unit at the position shown in Figure 2-2 2. Horn Alert/P.A. Relay Unit (KAP-2: Option) and secure it to the chassis with a screw. The Horn alert (max. 2A drive), Public address and Exter- 6.
  • Page 9 NX-900 INSTALLATION ■ Install the KRK-10 main panel onto the transceiver 3. Control Head Remote Kit (KRK-10: Option) 4. Insert the fl at cable that was removed in step 2 above The KRK-10 remote kit is used to remotely operate the into the connector (CN1) of the interface unit (A/2) of the transceiver.
  • Page 10 NX-900 INSTALLATION 10. Install the molded cover ( !3 ) over the connector on the ■ Connect the KRK-10 main panel to the rear main panel and secure it with two screws ( !4 ). panel with the cable 11. Insert the other 14-pin connector of the cable into the 8.
  • Page 11 NX-900 INSTALLATION ■ Connection Procedure 5. External Speaker (Option) Insert the crimp terminal into the Square plug supplied 5-1. KES-3 with the KAP-2. The KES-3 is an external speaker for the 3.5-mm-diameter speaker jack. ■ Connection Procedure 1. Connect the KES-3 to the 3.5-mm-diameter speaker jack on the rear of the transceiver.
  • Page 12 NX-900 INSTALLATION 6. GPS Receiver Connection 3M Double coated cushion 6-1. Installing the GPS receiver No. 4016 (or No. 4416) 30 x 25 mm 1. Remove the cabinet, top packing and shielding plate of the transceiver. 2. Remove the front panel from the transceiver.
  • Page 13 NX-900 INSTALLATION 6-2. Installing the GPS receiver together with the VGS- 1. Remove the cabinet, top packing and shielding plate of the transceiver. GPS receiver 2. Remove the front panel from the transceiver. 3. Attach a cushion to the bottom of the VGS-1 as shown in Figure 6-5.

  • Page 14: Disassembly For Repair

    NX-900 DISASSEMBLY FOR REPAIR ■ Removing the speaker hardware fi xture 1. Precautions on Disassembly (J21-8481-03) and holder (J19-5485-12) ■ TX-RX PCB (TX-RX unit A/2) Disassembly 1. Remove the speaker lead from the holder hook. ( q ) 1. Remove all screws and antenna terminals on the TX-RX 2.
  • Page 15 NX-900 DISASSEMBLY FOR REPAIR 2. Precautions on Reassembly ■ TX-RX PCB (TX-RX unit A/2) Reassembly 1. With the TX-RX PCB turned over, insert the flat cable from the D-sub PCB (TX-RX unit B/2) into the connector (CN600) on the TX-RX PCB.
  • Page 16 NX-900 DISASSEMBLY FOR REPAIR ■ D-sub cap installation procedure To improve water resistance, fi t the D-sub cap into the D-sub terminal hardware fi xture of the transceiver in the fol- lowing order: 1. Fit the left side ( q ) of the D-sub cap into the hardware fi...

  • Page 17: Circuit Description

    CIRCUIT DESCRIPTION 1. Overview 2. Frequency Confi guration NX-900 is an 800MHz Mobile transceiver designed to The receiver is a double-conversion super heterodyne operate in the frequency range of 806 to 870MHz. The unit using the first intermediate frequency (IF) of 58.05MHz consists of a receiver, transmitter, phase-locked loop (PLL) and the second IF of 450kHz.
  • Page 18 NX-900 CIRCUIT DESCRIPTION 3-3. IF circuit The second IF signal is passed through the ceramic fi lter (CF201,CF202) to reject the adjacent channel signal. The fi l- The fi rst IF signal is passed through a four-pole mono- tered second IF signal is amplifi ed by the AGC amplifi er.
  • Page 19 NX-900 CIRCUIT DESCRIPTION 4-2. Baseband Circuit 4. Transmitter System The audio signal output from the baseband circuit is con- 4-1. Audio Band Circuit verted to digital data of a sampling frequency of 48kHz. This The signal from the microphone goes through the...
  • Page 20 NX-900 CIRCUIT DESCRIPTION 5-3. PLL IC (IC3) 5. PLL Frequency Synthesizer The PLL IC compares the differences in phases of the 5-1. VCTCXO (X1) VCO oscillation frequency and the VCTCXO reference fre- VCTCXO (X1) generates a reference frequency of quency, returns the difference to the VCO CV terminal and 19.2MHz for the PLL frequency synthesizer.
  • Page 21 NX-900 CIRCUIT DESCRIPTION 6-4. Key Detection Circuit 6. Control Circuit Keys are detected using the Key scan circuit in IC911. The control circuit consists of the ASIC (IC510) and its The /KI* and KO* signals that are normally pulled up go low peripheral circuits.
  • Page 22 The compander reduces noise by utilizing a compressor signal is adjusted by changing the output level of IC717 and and an expander. The NX-900 contains a DSP (IC717) to per- the resulting signal is routed to the VCO and PLL IC (IC3).

  • Page 23: Components Description

    NX-900 COMPONENTS DESCRIPTION Display unit (X54-3680-10) TX-RX unit (X57-8060-10) Ref. No. Part Name Description Ref. No. Part Name Description IC901 AFO/BLC switch Temperature sensor IC902 AF buffer AMP (AFO) PLL IC IC903 Voltage regulator (5C) Buffer AMP (VCO tune) IC904...
  • Page 24 NX-900 COMPONENTS DESCRIPTION Ref. No. Part Name Description Ref. No. Part Name Description IC707 RXAF/RXEI switch Q413 Transistor DC switch (80T) IC708 AF switch (TXO/TXI) Q414 Transistor DC switch (80R) SUM AMP Q415 Transistor DC switch (50R) IC709 (AI/TONE/MI1 MI2)/(MOD/DI)
  • Page 25 NX-900 COMPONENTS DESCRIPTION Ref. No. Part Name Description D409 Diode DC/DC converter (50M) D410~412 Diode Reverse protection, DC/DC D501,502 Diode Line protection D504 Diode Reverse current prevention (RXD) Reverse current prevention D506 Diode (OR G_RXD2) Reverse current prevention D507 Diode...

  • Page 26: Parts List

    NX-900 PARTS LIST 2 2 0 CC45 Color* 010 = 1pF 0 = 22pF 1 = Type ... ceramic, electrolytic, etc. 4 = Voltage rating 100 = 10pF 2 = Shape ... round, square, etc. 5 = Value 101 = 100pF Multiplier 3 = Temp.
  • Page 27 NX-900 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.
  • Page 28 NX-900 PARTS LIST DISPLAY UNIT (X54-3680-10) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation C965 CK73HB1A104K CHIP C 0.10UF R953 RK73GB2A271J CHIP R 1/10W C966,967 CK73HB1H102K CHIP C...
  • Page 29 NX-900 PARTS LIST TX-RX UNIT (X57-8060-10) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation C83,84 CC73HCH1H101J CHIP C 100PF TX-RX UNIT (X57-8060-10) CK73HB1A104K CHIP C 0.10UF CK73HB0J105K CHIP C 1.0UF...
  • Page 30 NX-900 PARTS LIST TX-RX UNIT (X57-8060-10) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation C160 CC73HCH1H020B CHIP C 2.0PF C255 CC73FCH1H020B CHIP C 2.0PF C161 CC73HCH1H070B CHIP C 7.0PF...
  • Page 31 NX-900 PARTS LIST TX-RX UNIT (X57-8060-10) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation C446 CS77BA1C4R7M CHIP TNTL 4.7UF 16WV C596 CK73HB1A104K CHIP C 0.10UF C447 CK73HB1A224K CHIP C 0.22UF...
  • Page 32 NX-900 PARTS LIST TX-RX UNIT (X57-8060-10) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation ✽ C770 CK73HB1A104K CHIP C 0.10UF C946 C93-1847-05 CHIP C 4.3PF C773 CK73HB1A104K CHIP C 0.10UF...
  • Page 33 NX-900 PARTS LIST TX-RX UNIT (X57-8060-10) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation L34-4608-15 AIR-CORE COIL L916,917 L40-1575-71 SMALL FIXED INDUCTOR (15NH) L34-4607-15 AIR-CORE COIL L919 L92-0163-05...
  • Page 34 NX-900 PARTS LIST TX-RX UNIT (X57-8060-10) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation RK73HB1J102J CHIP R 1.0K 1/16W R208 RK73HB1J153J CHIP R 1/16W RK73HB1J221J CHIP R 1/16W...
  • Page 35 NX-900 PARTS LIST TX-RX UNIT (X57-8060-10) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation R405 RK73HH1J274D CHIP R 270K 1/16W R556-558 RK73HB1J104J CHIP R 100K 1/16W R406 RK73HH1J104D...
  • Page 36 NX-900 PARTS LIST TX-RX UNIT (X57-8060-10) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation R662,663 RK73HB1J474J CHIP R 470K 1/16W R760 RK73HB1J152J CHIP R 1.5K 1/16W R664-674 RK73HB1J104J...
  • Page 37 NX-900 PARTS LIST TX-RX UNIT (X57-8060-10) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation R837 RK73HB1J472J CHIP R 4.7K 1/16W D103 MA4PH633 DIODE R838 RK73HB1J000J CHIP R 1/16W...
  • Page 38 NX-900 PARTS LIST TX-RX UNIT (X57-8060-10) Desti- Desti- Ref. No. Ad dress Parts No. Description Ref. No. Ad dress Parts No. Description parts nation parts nation IC511 TC7SH08FU-F MOS-IC Q901,902 QSX6 TRANSISTOR IC512,513 TC7SET08FU-F MOS-IC Q903 SSM3K15TE(F) IC514 TC7WBD125AFK MOS-IC...

  • Page 39: Exploded View

    NX-900 EXPLODED VIEW A : N09-2292-05 B : N67-3008-48 C : N87-2606-43 D : N87-2608-48 IC715 IC403 IC102 TX-RX unit A/2 (X57-) TX-RX unit B/2 (X57-) Display unit (X54-) Parts with the exploded numbers larger than 700 are not supplied.

  • Page 40: Packing

    NX-900 PACKING 64 Microphone 8 Instruction manual (T91-0639-55) (B62-2308-00) 23 Fuse (Blade type)15A/32V (F52-0024-05) 49 Holder (MIC) (J19-1584-15) 45 Packing fixture (H12-4274-03) 12 DC cord assy (E30-7523-55) 61 Screw set 56 Bracket 46 Packing fixture (N99-2039-05) (J29-0726-03) (H12-4275-02) 44 Inner carton case...

  • Page 41: Trouble Shooting

    NX-900 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 42 NX-900 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 R408. If the ASIC side is 0V, SBC R408 3.3V...
  • Page 43 Use the KPG-110SM on the NXDN Trunking System side to reprogram the NXDN ESN number. ■ Supplied Accessories of “Service TX-RX Unit” • When a new printed circuit board is used, the Kenwood ESN changes, as does the Transceiver information dis- Item (Including Part Number)

  • Page 44: Adjustment

    NX-900 ADJUSTMENT Controls “FNC” not appears on the sub LCD display Function Display Power switch Microphone key Volume Up/Down key Channel Up/Down key [PTT] Transmit Use as the DTMF keypad. [0] to [9] If a key is pressed during and [A]...
  • Page 45 NX-900 ADJUSTMENT ■ Frequency and Signaling Panel Tuning Mode The transceiver has been adjusted for the frequencies ■ Preparations for tuning the transceiver shown in the following table. When required, readjust them Before attempting to tune the transceiver, connect the following the adjustment procedure to obtain the frequen- unit to a suitable power supply.
  • Page 46 NX-900 ADJUSTMENT ■ 2 reference level adjustments frequency ■ 3 reference level adjustments frequency Receive Assist Tuning point RX (MHz) TX (MHz) Tuning point RX (MHz) TX (MHz) 851.100000 806.000000 851.100000 806.000000 Center 859.900000 815.000000 High 869.900000 825.000000 High 869.900000 825.000000...
  • Page 47 NX-900 ADJUSTMENT ■ Adjustment item and Display Aw (Analog As (Analog An (Analog Nn (NXDN Nv (NXDN Adjusutment Main LCD Very Narrow) Adjust item Wide 5k) Wide 4k) Narrow) Narrow) Order Sub-LCD display item display Number Adjustment range 1 point ADJ...
  • Page 48 NX-900 ADJUSTMENT ■ Panel tuning mode fl ow chart Note: In this Panel tuning mode fl ow chart, the Adjustment item name is modifi ed. Panel test mode Adjustment Item N/W/VN [Receive Assist] LCD Display ] hold For all adjustment items, press the...
  • Page 49 NX-900 ADJUSTMENT CW ID Deviation Very CWID Narrow ] press ] hold [ ] [ ] [ ] [ ] RSSI (Reference) Wide RSSI (Reference) Wide RSSI (Reference) RSSI (Reference) Very Narrow RRSSI RRSSI RRSSI RRSSI Narrow ] press ] hold 3 reference level Adjustments [ ]...
  • Page 50 NX-900 ADJUSTMENT Test Equipment Required for Alignment Test Equipment Major Specifi cations Frequency Range 800 to 900MHz 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 51 NX-900 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 806.049194~ check PTT: ON Channel: 1 806.050806MHz...
  • Page 52 NX-900 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 VTVM Ext.
  • Page 53 NX-900 ADJUSTMENT Condition Measurement Adjustment Specifi cations / Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 5. RTC 1) Adj item: [RTC] 1) Adj item: [RTC [Panel tuning mode] Adjustment of the (Real-time Adjust: [✳✳✳]...
  • Page 54 NX-900 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: [HILMT] 1) Adj item: [High Power [Panel 17.5W ±0.5W Transmit Adjust: [✳✳✳✳]...
  • Page 55 NX-900 ADJUSTMENT Condition Measurement Adjustment Specifi cations / Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 3. High 1) Adj item: [HIPWR] 1) Adj item: [High Power [Panel 15.0W ±1.0W Transmit Adjust: [✳✳✳✳]...
  • Page 56 NX-900 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 1337Hz 1331~1363Hz Deviation Adjust: [✳✳✳✳]...
  • Page 57 NX-900 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: [Aw ADEV] 1) Adj item: [Maximum Deviation [Panel 4200Hz 4150~4250Hz Deviation Adjust: [✳✳✳✳]...
  • Page 58 NX-900 ADJUSTMENT Condition Measurement Adjustment Specifi cations / Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 1) Adj item: [As DQT] 1) Adj item: [DQT De- Deviation [Panel Write the value as 0.55~0.65kHz Deviation Adjust: [✳✳✳✳]...
  • Page 59 NX-900 ADJUSTMENT Condition Measurement Adjustment Specifi cations / Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment DTMF 1) Adj item: [As DTMF] 1) Adj item: [DTMF Deviation [Panel Write the value as 2.30~2.50kHz Deviation Adjust: [✳✳✳✳]...
  • Page 60 NX-900 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)”, this signaling is composed of three elements [Balance, Maximum Deviation (Analog Wide 5k) and QT Deviation (Wide 5k)].
  • Page 61 NX-900 ADJUSTMENT Receiver Section Condition Measurement Adjustment Specifi cations / Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 1. AF level [Panel test mode] 1) Test Channel [Panel Volume Up/Down 2.83V±0.3V setting 1) CH-Sig: 1-1 Channel: 1 Ext.SP...
  • Page 62 NX-900 ADJUSTMENT Condition Measurement Adjustment Specifi cations / Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 3. Open 1) Adj item: [An SQL] 1) Adj item: [Open [Panel tuning mode] “Open Squelch” Squelch *6 Adjust: [✳✳✳]...
  • Page 63 NX-900 ADJUSTMENT Condition Measurement Adjustment Specifi cations / Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 4. Low RSSI 1) Adj item: [An LRSSI] 1) Adj item: [Low RSSI [Panel tuning mode] at –118dBm Adjust: [✳✳✳]...
  • Page 64 NX-900 ADJUSTMENT Condition Measurement Adjustment Specifi cations / Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 5. High RSSI 1) Adj item: [An HRSSI] 1) Adj item: [High [Panel tuning mode] at –80dBm Adjust: [✳✳✳]...
  • Page 65 NX-900 ADJUSTMENT Condition Measurement Adjustment Specifi cations / Item Test- Remarks Panel tuning mode PC test mode Unit Terminal Unit Parts Method equipment 6. Tight 1) Adj item: [An SQLT] 1) Adj item: [Tight [Panel tuning mode] Squelch Adjust: [✳✳✳]...

  • Page 66: Terminal Function

    NX-900 TERMINAL FUNCTION Display unit (X54-3680-10) Pin No. Name Function Pin No. Name Function J901 (MIC jack) CN901 (to TX-RX unit A/2 CN597) MIC key backlight control Speaker input Power output of switched power supply DC13.6V±15%, 200mA typ Ground Ground...
  • Page 67 NX-900 TERMINAL FUNCTION Pin No. Name Function Pin No. Name Function No connection Speaker input 5V output Control signal output of PA function SHIFT Control signal output of Beat-shift function Control signal output of Horn alert function 8~11 Ground Ground...
  • Page 68 NX-900 TERMINAL FUNCTION Pin No. Name Function Pin No. Name Function AUXIO9 AUXIO5 AUXIO4 Refer to “D-sub 25-pin connector specifi ca- AUXIO3 tion” described on pages 73 to 75. AUXIO8 AUXIO2 TXD2 AUXIO1 RXD2 Refer to “D-sub 25-pin connector specifi ca- tion”...
  • Page 69 NX-900 TERMINAL FUNCTION Rating and Condition Pin Name I/O Signal Type Parameter Unit –0.3 OPT5 I/O Digital/CMOS Out/CMOS In VOH (Io=–2mA) VOL (Io=2mA) DGND AGND Input Level Vp-p OPT9 Analog Coupling Capacitor 0.01 µF (STON) Input Impedance kΩ Input Level...
  • Page 70 NX-900 TERMINAL FUNCTION Rating and Condition Pin Name I/O Signal Type Parameter Unit Ouput Voltage (Iout=100mA) Power Output Current RXD2 Digital/CMOS In with Interrupt –10 Baud Rate 19200 VOH(Io=-8mA) TXD2 Digital/CMOS Out VOL(Io=8mA) Baud Rate 19200 Output Voltage (Iout=100mA) 4.65...
  • Page 71 NX-900 TERMINAL FUNCTION Rating and Condition Pin No. Pin Name I/O Signal Type Parameter Unit DGND AGND Input Amplitude Vp-p Analog Coupling Capacitor µF Input Impedance kΩ Output Amplitude 50.0 mVp-p Analog Coupling Capacitor µF Allowable Load kΩ AGND Output Voltage...
  • Page 72 NX-900 TERMINAL FUNCTION Rating and Condition Pin No. Pin Name I/O Signal Type Parameter Unit Input Level mVp-p Analog Coupling Capacitor µF Input Impedance kΩ –0.3 OPT6 I/O Digital/CMOS Out/CMOS In VOH (Io=–2mA) VOL (Io=2mA) Output Voltage (Iout=100mA) Power Output Current CN595 26-pin connector specifi...
  • Page 73 NX-900 TERMINAL FUNCTION Pin No. Pin Name Device Connection Description/Function ANI board VGS-1 VGS Audio signal input ANI board VGS-1 VGS Audio signal output ANI board AGND VGS-1 AGND AGND ANI board Note: 80C and 50C can not be used simultaneously.
  • Page 74 NX-900 TERMINAL FUNCTION Rating and Condition Pin No. Pin Name Parameter Unit Voltage Swing (3kΩ Load) ±5 ±9 TXD1 Serial data output 1. Digital Baud Rate 11520 RS-232C level. –0.5 AUXIO9 I/O Digital AUX input/output 9. VOH (Io=–1.5mA) VOL (Io=1.5mA)
  • Page 75 NX-900 TERMINAL FUNCTION Rating and Condition Pin No. Pin Name Parameter Unit GND (Ground) Output Level 0.28 Vp-p Coupling Capacitor µF allowable Load kΩ Detected signal Analog Freq. Response (STD Dev) Wide; 20~4800Hz –6 output. Freq. Response (STD Dev) Wide; 4800-7200Hz –24...

  • Page 76: Pc Board

    NX-900 PC BOARD DISPLAY UNIT (X54-3680-10) Component side view (J79-0157-39) LEFT D929 D914 C922 R922 D935 DM/KVL HK/RXD LEFT DOWN PTT/TXD BLC/AFO DISPLAY UNIT (X54-3680-10) Foil side view (J79-0157-39) CP909 R907 IC905 R963 D904 R952 R935 C927 C948 CP917 IC901...
  • Page 77 NX-900 PC BOARD DISPLAY UNIT (X54-3680-10) Component side view (J79-0157-39) Ref. No. Address Ref. No. Address R988 R990 Q913 D924 R976 R989 R960 Q913 R991 C958 D908 D925 RIGHT D911 D926 D912 D927 D936 D914 D928 D915 D929 D916 D930...

  • Page 78: Tx-Rx Unit (X57-8060-10) (A/2)

    NX-900 PC BOARD TX-RX UNIT (X57-8060-10) (A/2) Component side view (J79-0302-19 A/2) J701 EXT. SP Q403 R401 C480 CN705 C805 IC715 R826 C820 D408 C132 C485 C131 C486 C128 L401 C123 R943 R105 R944 IC403 L106 L402 C258 R104 L403...
  • Page 79 NX-900 PC BOARD TX-RX UNIT (X57-8060-10) (A/2) Component side view (J79-0302-19 A/2) Ref. No. Address Ref. No. Address Q405 R890 Q406 Q411 IC102 Q501 IC102 Q709 IC103 IC201 IC202 IC203 D108 IC403 D202 IC406 D404 C849 R972 IC407 D405 C848...
  • Page 80 NX-900 PC BOARD TX-RX UNIT (X57-8060-10) (A/2) Foil side view (J79-0302-19 A/2) Ref. No. Address Ref. No. Address Ref. No. Address IC401 7M Q903 11R IC402 IC404 C946 IC405 C189 IC408 5M C947 IC409 L113 IC501 12P Q150 C195 IC503 12Q...
  • Page 81 NX-900 PC BOARD TX-RX UNIT (X57-8060-10) (A/2) Foil side view (J79-0302-19 A/2) C811 C810 R410 D406 D401 Q401 C479 Q402 C475 R825 L405 C445 C801 C446 + Q404 C802 C415 D407 C468 D409 R430 Q414 C443 C804 C454 IC405 C441...

  • Page 82: Tx-Rx Unit (X57-8060-10) (B/2)

    NX-900 PC BOARD TX-RX UNIT (X57-8060-10) (B/2) Component side view (J79-0302-19 B/2) C905 C906 C904 Component side D906 Layer 1 J79-0302-19 B/2 C903 C915 Layer 2 C902 Layer 3 Layer 4 Layer 5 Ref. No. Address Layer 6 D905 CN901...

  • Page 83: Interconnection Diagram

    NX-900 INTERCONNECTION DIAGRAM...

  • Page 84: Schematic Diagram

    NX-900 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8060-10) (A/2) X2_CLKIN X2_CLKIN PLL_MOD DGND 33M_1 33M_1 33M_1 C518 C512 0.1u R521 47k R520 47k 3.31V 1.49V D[15] D[14] D[13] D[12] D[11] D[10] D[9] D[8] C503 D[7] 0.1u D[6] D[5] D[4] D[3] D[2] D[1]...
  • Page 85 NX-900 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8060-10) (A/2) X2_CLKIN X2_CLKIN X2_CLKIN PLL_MOD 33M_1 3.31V DQ11 L501 IC501 DQ13 FLASH MEMORY DQ15 VSS1 CN904 CLKoUT VSS2 R504 100k GPIo0 GPIo1 GPIo2 3.33V GPIo3 R541 100 3.31V GPIo4 /MCCSXCN IC718 C515 GPIo5 TC7SH08FU-F...
  • Page 86 NX-900 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8060-10) (A/2) X2_CLKIN X2_CLKIN ASQDET R720 R577 100k R569 XTALI XTALo C623 0.01u A12 DSPCK /RINT /HINT USRCKI ADD0 ADD1 ADD2 ADD3 ADD4 ADD5 ADD6 ADD7 ADD8 ADD9 ADD10 ADD11 ADD12 ADD13 ADD14 ADD15 ADD16...
  • Page 87 NX-900 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8060-10) (A/2) X2_CLKIN X2_CLKIN ASQDET R603 3.33V DGND3 DGND2 DGND1 C547 0.1u DVDIo7 C548 0.1u DVDIo6 C549 0.1u DVDIo5 C550 0.1u DVDIo4 C551 0.01u DVDIo3 C552 1u DVDIo2 DVDIo1 C554 0.1u 3.31V DVDD10 C555 0.1u DVDD9 C556 0.1u...
  • Page 88 NX-900 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8060-10) (A/2) X2_CLKIN IC511 TC7SH08FU-F 3.33V 3.31V R596 R114 IC508 oUTY SM5023CNDH-G X502 L77-3015-05 C530 (CPS/FSX0) 0.01u 0.33V oUTPUT R594 INHN BUFFER AMP (18.432MHz) C531 0.1u BSHIFT 33GPS D501,502 LINE PROTECTION D501 1SS388F C828 D502...
  • Page 89 NX-900 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8060-10) (A/2) 3.32V BUFFER AMP (2nd IF DET) 3.33V C729 0.1u IC706 TC75W51FK(F) MIC AA C707 R716 0.1u R725 R722 450k R748 R753 C742 R766 C748 C710 C732 0.1u 100k 0.1u 1.67V 0.01u 0.01u LPF/SUM AMP MIC SUM2 1.67V...
  • Page 90 NX-900 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8060-10) (A/2) 33A_ 2 R833 100 33A_ 2 SDO0 /INAMT R834 100 R729 SCK0 100k R835 100 /EVCS C722 ASQ DET VoUT3 BPF/BUFFER VCO_MOD VoUT4 VoUT2 AMP (SQ) IC719 VIN4 VoUT1 R2A20178NP VIN5 VIN1 ASQ BPF...
  • Page 91 NX-900 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8060-10) (A/2) R825 C801 C802 R828 Q710 R823 DTC363EU 4.7k AUDIO R662 470k MUTE Q709 SWITCH MUTE R663 470k /INAMT RT1N141U-T111 /INT25P C591 0.01u LINE PROTECTION (AID9) IC514 5.01V TC7WBD125AFK I2CCK I2CDT Io1.2 Io1.1 IC517 PCA9535BS Io1.0...
  • Page 92 NX-900 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8060-10) (A/2) IC715 LA4425A AF POWER CN705 R831 C810 470p TX-RX UNIT (X57-8060-10) (B/2) : D-SUB25 D901 D903 D907 D911 J701 LINE LINE LINE LINE PROTECTION PROTECTION PROTECTION PROTECTION (BER CK) (AUXIO1) (AUXIO3) (AUXIO8) EXT.SP...
  • Page 93 NX-900 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8060-10) (A/2) R : 13.60V T : 13.52V L401 L402 CN401 L403 IC405 LT1616ES6-PBF R : 13.59V T : 13.49V SHDN 5.02V L404 D409 CN402 BooST 1SS388F D404 D405 SURGE REVERSE L405 ABSORPTION PROTECTION IC405,D407,409...
  • Page 94 NX-900 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8060-10) (A/2) TA : 3.60V BUFFER AMP OTHER : 0V (RF) BUFFER AMP 4.83V D927 (VCO) D7,10 220n 2SC5636 1.88V FREQUENCY FREQUENCY 3.75V VCO 1 MODULATION CONTROL CONTROL R976 150k 17.5n 150p 0.5p 1SV278F MCH3914(8)-H C862 1.5p...
  • Page 95 NX-900 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8060-10) (A/2) C973 C975 C938 C967 C969 C970 C971 L914 L915 C977 L919 1.5p 5.6n 5.6n FL : 7.60V FH : 7.55V R938 TX DRIVE AMP C982 FL : 5.97V FL : 2.04V D101 Q151 FH : 5.60V...
  • Page 96 NX-900 SCHEMATIC DIAGRAM TX-RX UNIT (X57-8060-10) (A/2) IC102 RA45H76871101 POWER MODULE FL : 2.17V FH : 2.18V FL : 13.40V FH : 13.41V TX POWER L159 L160 L161 C169 C165 C121 C245 R168 R102 DETECT 1.5n 8.2n 8.2n D103 D109...
  • Page 97 NX-900 SCHEMATIC DIAGRAM DISPLAY UNIT (X54-3680-10) R924 R925 "PF4" VOL UP R922 CN902 CH UP "PF3" VOL DOWN R923 CH DOWN "PF2" "PF1" TX-RX UNIT (X57-8060-10) (A/2) CN597 CN901 D908,911,912 KEY MATRIX C580 100p 3.12V C581 POWER 100p C582 100p...
  • Page 98 NX-900 SCHEMATIC DIAGRAM DISPLAY UNIT (X54-3680-10) 8.00V 7.97V Q910 12A02CH TX/RX LED 7.27V BACK TX/RX LED (BUSY) LIGHT (TX) R :0V R : 5.00V Q905 Q906 D915-926 D927-936 T : 5.00V T : 0V RT1N141U-T111 RT1N141U-T111 BACK LIGHT BACK LIGHT...
  • Page 99 NX-900 SCHEMATIC DIAGRAM DISPLAY UNIT (X54-3680-10) CN905 -4.29V C956 0.01u 33C-2 C955 Q913 UPA672T-A R976 100p FLASH MEMORY IC913 29LV16BT7KDDA 3.30V 3.30V /CS0 R900 VSS1 RESET /CS1 BUS BUFFER BUS BUFFER DQ10 RY/BY (A1-A2) (D0-D7) 3.30V R986 DQ11 RESET /CS3...

  • Page 100: Level Diagram

    NX-900 LEVEL DIAGRAM Receiver Section Radio Frequency 58.05MHz 450kHz –120.5dBm –107.5dBm –122.0dBm –106.0dBm –8 –119.0dBm –122.5dBm –117.5dBm –120.5dBm –74.0dBm –82.0dBm RF AMP 1st Mixer IF AMP IF AMP FM SYSTEM IC IF AM L906 L907 XF202 CF203 IC716 Q205 Q204...
  • Page 101 NX-900 LEVEL DIAGRAM 450kHz Audio Frequency –81.5dBm –82.0dBm –68.0dBm 180mVrms 218mVrms 218mVrms 88mVrms 4.00Vrms (EVOL) IF AMP IF AMP (ASIC) (RXAF SMF) (RX SUM) VOL=20 (SP AMP) IC201 IC704 IC510 IC701 IC711 IC719 IC715 J701 AF VTVM AF level obtained when the AF output level is adjusted for 4.00V/4Ω...

  • Page 102: Block Diagram

    NX-900 BLOCK DIAGRAM TX-RX UNIT (X57-806) 2SC5383-T111 Ripple DCin CN401 FILTER (13.6V) F401 LM73CIMKX-0 F53-0328-05 I2CCK TEMP CN402 DCDC I2CDT SENSOR Converter IC402 ASSIST IC405 BUFF XC6204B332P-G 2SK3737-5 LT1616ES6-PBF L77-3016-05 3.3V AVR XC221A1200MRG VCTCXO IC408 BUFF XC6204B332M-G 19.2MHz 3.3V AVR...
  • Page 103 NX-900 BLOCK DIAGRAM SC5383-T111 2SC5383-T111 Ripple FILTER /T_R T/R SW SSM6L05FU-F D103 SSM3J05FU-F MA4PH633 00MRG 806-825MHz(TX) D925,926 851-870MHz(TX/RX) RKP351KW-1P2 D920,921 D101,205 PRE- RN142S HVC131 DRIVE DRIVE FINAL RFRF POWER Q5,Q6 BUFF COUPLER MODULE MCH3914(8)-H Q150 Q151 IC102 Q420 2SK3077F RD01MUS1-T113...
  • Page 104 NX-900 BLOCK DIAGRAM CN905 LCD Connector...
  • Page 105 NX-900 MEMO...
  • Page 106 NX-900 MEMO...

  • Page 107: Specifications

    Audio Distortion ..........Less than 3% Modulation ..........16K0F3E, 14K0F3E, 11K0F3E, 8K30F1E, 8K30F1D, 8K30F7W, 4K00F1E, 4K00F1D, 4K00F7W, 4K00F2D Analog measurements made per TIA/EIA 603 and specifi cations shown are typical. Kenwood reserves the right to change specifi cations without prior notice or obligation.
  • Page 108 Suite 2504, 25/F, Tower 2, Nina Tower, No. 8 Yeung Uk Road, Bp 58416 Villepinte, 95944 Roissy Ch De Gaulle Cedex Tsuen Wan, New Territories, Hong Kong KENWOOD House, Dwight Road, Watford, Herts., 1 Ang Mo Kio Street 63, Singapore 569110 WD18 9EB United Kingdom...
  • Page 109 NX-900 NX-900 PC BOARD PC BOARD DISPLAY UNIT (X54-3680-10) Component side view (J79-0157-39) DISPLAY UNIT (X54-3680-10) Component side view (J79-0157-39) Ref. No. Address Ref. No. Address R988 R990 Q913 D924 R976 R989 R960 Q913 R991 C958 D908 D925 LEFT RIGHT...
  • Page 110 NX-900 NX-900 PC BOARD PC BOARD TX-RX UNIT (X57-8060-10) (A/2) TX-RX UNIT (X57-8060-10) (A/2) Component side view (J79-0302-19 A/2) Component side view (J79-0302-19 A/2) J701 EXT. SP Q403 R401 C480 Ref. No. Address Ref. No. Address Q405 R890 Q406 CN705...
  • Page 111 NX-900 NX-900 PC BOARD PC BOARD TX-RX UNIT (X57-8060-10) (A/2) TX-RX UNIT (X57-8060-10) (A/2) Foil side view (J79-0302-19 A/2) Foil side view (J79-0302-19 A/2) Ref. No. Address Ref. No. Address Ref. No. Address IC401 7M Q903 11R IC402 C811 C810...
  • Page 112 NX-900 PC BOARD TX-RX UNIT (X57-8060-10) (B/2) Component side view (J79-0302-19 B/2) C905 C906 C904 Component side D906 Layer 1 J79-0302-19 B/2 C903 C915 Layer 2 C902 Layer 3 Layer 4 Ref. No. Address Layer 5 Layer 6 D905 CN901...
  • Page 113 TX-RX UNIT (X57-8060-10) (A/2) X2_CLKIN X2_CLKIN X2_CLKIN X2_CLKIN X2_CLKIN X2_CLKIN X2_CLKIN X2_CLKIN X2_CLKIN X2_CLKIN T : 13.52V R : 13.60V C973 C975 IC102 ASQDET ASQDET L401 OTHER : 0V TA : 3.60V BUFFER AMP (RF) BUFFER AMP RA45H76871101 POWER MODULE R603 LA4425A IC715...
  • Page 114 TX-RX UNIT (X57-806) 2SC5383-T111 2SC5383-T111 Ripple Ripple DCin CN401 FILTER FILTER (13.6V) F401 LM73CIMKX-0 /T_R F53-0328-05 I2CCK TEMP CN402 DCDC I2CDT SENSOR Converter T/R SW IC402 ASSIST IC405 BUFF SSM6L05FU-F XC6204B332P-G LT1616ES6-PBF L77-3016-05 2SK3737-5 D103 3.3V AVR SSM3J05FU-F MA4PH633 VCTCXO XC221A1200MRG 806-825MHz(TX) IC408...
  • Page 115 Radio Frequency 58.05MHz 450kHz Audio Frequency –120.5dBm –107.5dBm –122.0dBm –106.0dBm –81.5dBm –119.0dBm –122.5dBm –117.5dBm –120.5dBm –74.0dBm –82.0dBm –68.0dBm 180mVrms 218mVrms 218mVrms 88mVrms 4.00Vrms (EVOL) RF AMP 1st Mixer IF AMP IF AMP FM SYSTEM IC IF AMP IF AMP L906 L907 XF202 CF203...

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