SERVICE MANUAL - Nexo

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NXAMP4x4KJIHGFEDCBA■ BLOCK DIAGRAM 1/5 1AC SupplyPower Supply BlockSee Page. 5Power Switch*1234Inter-Block SignalsINANH -> CONTROLANA_IN[1:4]Analog Audio SignalsPAANH -> CONTROLTEMP_PA[1:4]Temperature Data of Power Amplifier UnitsCLIP_PA[1:4]Clip Signals of Power Amplifier UnitsOUTANH -> CONTROLSENSE_U[1:4]SenseBack Signals of Amplifier Output VoltageSENSE_I[1:4]SenseBack Signals of Amplifier Output CurrentPSANHA. PSANHB -> COLNTROMAINS_AMAINS DataMAINS_BPSW_DETECTStatus of Power SwitchTEMP_PS_A[1:2]Temperature Signals of Power Supply UnitsTEMP_PS_B[1:2]VOLTAGE_PS_A[1:2]Output Voltage data of Power Supply UnitsVOLTAGE_PS_B[1:2]CONTROL -> PAANHANA-OUT[1:4]Analog Audio SignalsRELAY_PA1[1:4] Control Signals for Relays on Power Amplifier UnitsCONTROL -> OUTANHRELAY_OUT[1:4] Control Signals for Output RelaysCONTROL -> PSANHA, PSANHBRELAY_PS_A[1:2]Control Signals for Relays on Power Supply UnitRELAY_PS_B[1:2]SHUTDOWN_PS_AShutdown Signals for Power Supply CiricuitsSHUTDOWN_PS_BANALOG AUDIO INPUTs[+28dBu]MAXChannel 1Channel 2Channel 3Channel 4Analog Input BlockGAIN: -14dB+9AEMCBAFILTER-9AGAIN: -14dB+9AEMCBAFILTER-9AGAIN: -14dB+9AEMCBAFILTER-9AGAIN: -14dB+9AEMCBAFILTER-9AANALOG AUDIOANALOG AUDIO Signals[+14dBu]MAXANA_IN1AGND1ANA_IN2AGND2ANA_IN3AGND3ANA_IN4AGND4+9AAGND-9AControl BlockSee Page. 7+24A_B+24A_A+15A+5A-15AAGNDPA CONTROLRELAY_PA1ANALOG AUDIOANA_OUT1AGND1PA DATATEMP_PA1CLIP_PA1PA CONTROLRELAY_PA2ANALOG AUDIOANA_OUT2AGND2PA DATATEMP_PA2CLIP_PA2+5AAGND+B_A1+E_A1+15+E_A1PGND_A1-B_A1-E_A1+15-E_A1+5AAGND+B_A2+E_A2+15+_A2EPGND_A2-B_A2-E_A2+15-E_A2+5AAGNDPower Amplifier BlockSee Page. 6Power Amplifier BlockSee Page. 6POUT1POUT2Output BlockSee Page. 6FAN_CONTROL_[1:2]PAANH -> OUTPAHPOUT[1:4]FAN speed control signalsOutput of Power Amplifier UnitsCONNECTION POINTofAGND[1:4] & AGNDUser Interface BlockSee Page. 7(LCD,SW,Encorder,LED...)PA CONTROLRELAY_PA3+B_B1+E_B1+15+E_B1PGND_B1POUT3ReferencePointOfGroundingANALOG AUDIOANA_OUT3AGND3Power Amplifier BlockSee Page. 656Power Supply Lines+24A_A+24A_B+15A+9A+5A-9A-15A+5D+3.3D+B_A[1:2]+B_B[1:2]-B_A[1:2]-B_B[1:2]+E_A[1:2]+15+E_B[1:2]+15+E_A[1:2]+E_B[1:2]-E_A[1:2]+15-E_B[1:2]+15-E_A[1:2]-E_B[1:2]for Small Signal Analog Circuitsfor Digital CircuitsPositive Rail Voltage Line for Power Amplifier UnitsNegative Rail Voltage Line for Power Amplifier UnitsFor EEEngine DriveRS232 BLOCKGPI BLOCKES(OPTION)AC SupplyOUT RELAY CONTROLRELAY_OUT1RELAY_OUT2RELAY_OUT3RELAY_OUT4SENSE BACK SIGNALSSENSE_U1SENSE_U2SENSE_U3SENSE_U4SENSE_I1SENSE_I2SENSE_I3SENSE_I4CONNECTIONPOINTBetweenDGND & AGNDPA DATATEMP_PA3CLIP_PA3PA CONTROLRELAY_PA4ANALOG AUDIOANA_OUT4AGND4PA DATATEMP_PA4CLIP_PA4-_B1B-E_B1+15-E_B1+5AAGND+B_B2+E_B2+15+E_B2PGND_B2-B_B2-E_B2+15-E_B2Power Amplifier BlockSee Page. 6POUT47GND LinesAGND[1:4]AGNDDGNDfor Analog Audio Signals of Each Channnelfor Common Analog Circuitsfor Digital Circuits*1Power SwitchPower Supply BlockSee Page. 5PGND_A[1:2]PGND_B[1:2]Reference Voltage of Main Power Supplies8Note: *1) Two power switches drawn in this block diagram are included in one device of a parallel type.28CA1-2001022110-104
HGFEDCBANXAMP4x4■ BLOCK DIAGRAM 2/5 PSANHASUB POWER SUPPLY 1 MAIN POWER SUPPLY 1AC (V) B(V)100~120 165~198220~240 181~198NOTE)Voltage of +/-B with no LOADSUBTRANSFORMERAC VOLTAGEDETECT1FGEMIFILTERPSW+24RELAY DRIVECIRCUITPSW DETECTRELAYSWITCHINGCONTROLLERRELAYRELAY DRIVECIRCUIT+15VA+15VAVOLTAGESENCE+24+5VA+3.3VD+15VA+15VAOVERCURRENTDETECTOR200ApeakPS HEAT SINKTEMPERATURESENSORMAIN POWER SUPPLY 2OVERCURRENTDETECTOR200ApeakPS HEAT SINKTEMPERATURESENSOR+90 C+90 CSWITCHINGDRIVERCONTROLICSHUTDOWNCIRCUIT(LATCH)SWITCHINGDRIVERSHUTDOWNCIRCUIT(LATCH)MAIN TRANSFORMERPHASE SHIFTSWITCHINGPS VOLTAGEDETECTFAN CONTROLCIRCUITPS VOLTAGEDETECTFAN CONTROLCIRCUIT+B(B)-B(B)E+15V+E-E-E+15VOUT RELLAY+B(B)-B(B)E+15V+E-E-E+15VFAN(R)FAN(L)PS DATAMAINS_A/PSW_DETECTTEMP_PS_A1TEMP_PS_A2VOLTAGE_PS_A1VOLTAGE_PS_A2PS CONTROLRELAY_PS_A1RELAY_PS_A2SHUTDOWN_PS_AFAN_CONTROL_1FAN_CONTROL_22PSANHBRUSH CURRENT PROTECTIONSUB POWER SUPPLY 23SUBTRANSFORMERAC VOLTAGEDETECTMAIN POWER SUPPLY 3AC (V) B(V)100~120 165~198220~240 181~198NOTE)Voltage of +/-B with no LOAD+5DOVERCURRENTDETECTOR200ApeakPS HEAT SINKTEMPERATURESENSOR+90 CSWITCHINGDRIVERCONTROLICSHUTDOWNCIRCUIT(LATCH)MAIN TRANSFORMERPS VOLTAGEDETECTFAN CONTROLCIRCUIT+B(B)-B(B)E+15V+E-E-E+15VOUT RELLAYFAN(L)MAINS_BPS DATA4FGEMIFILTER+24RELAY DRIVECIRCUITRELAYSWITCHINGCONTROLLERRELAYRELAY DRIVECIRCUITVOLTAGESENCE+24+15VA+15VAMAIN POWER SUPPLY 4OVERCURRENTDETECTOR200ApeakPS HEAT SINKTEMPERATURESENSOR+90 CSWITCHINGDRIVERSHUTDOWNCIRCUIT(LATCH)PHASE SHIFTSWITCHINGPS VOLTAGEDETECTFAN CONTROLCIRCUIT+B(B)-B(B)E+15V+E-E-E+15VFAN(R)TEMP_PS_B1TEMP_PS_B2VOLTAGE_PS_B1VOLTAGE_PS_B2PS CONTROLRELAY_PS_B1RELAY_PS_B2SHUTDOWN_PS_BFAN_CONTROL_1FAN_CONTROL_25RUSH CURRENT PROTECTION28CA1-2001022110-205
Page 1 and 2:
SERVICE MANUAL■ CONTENTS PANEL LA
Page 3 and 4:
NXAMP4x4■ PANEL LAYOUT • Front
Page 5 and 6:
NXAMP4x4■ SERVICE PRECAUTIONS Saf
Page 7 and 8:
NXAMP4x4■ OVERALL ASSEMBLY WIRING
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NXAMP4x43. Wiring of the FANConnect
Page 11 and 12:
NXAMP4x4d, e) Fix the wires to the
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NXAMP4x4CN401YELLOW Fig. 20 NOTE:
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NXAMP4x4b-3) Then fasten these wire
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NXAMP4x4At the stage as shown in Fi
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NXAMP4x4o) Fasten the wires (WK0208
Page 21 and 22:
NXAMP4x48. Color of the connectors
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NXAMP4x412. Confirmation of Switch
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NXAMP4x4■ DISASSEMBLY PROCEDURES
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NXAMP4x43. PSANHA Circuit Board(Tim
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NXAMP4x45. PSANHB Circuit Board(Tim
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NXAMP4x48. Upper left (CH1) PA unit
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NXAMP4x412. Front Panel Assembly(Ti
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NXAMP4x416. Lower left DC Fan(Time
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■ LSI PIN DESCRIPTION NXAMP4x4
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NXAMP4x4CS4272-CZZR (X8487A0)CODECC
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NXAMP4x4NJU7630-M (X8682A0)Regulato
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NXAMP4x4SN74LVC157APWR (X6786A0)Dat
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NXAMP4x4• INANH Circuit Boardto C
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NXAMP4x4• CONTROL Circuit BoardAA
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NXAMP4x4• CONTROL Circuit BoardBP
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NXAMP4x4• OUTANH Circuit BoardPat
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NXAMP4x4• PN-AN Circuit BoardAEnc
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NXAMP4x4• PN-AN Circuit BoardBPat
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NXAMP4x4• PAANH Circuit BoardAA't
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NXAMP4x4• PSANHA, PSANHB Circuit
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NXAMP4x4• PSANHA, PSANHB Circuit
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NXAMP4x4• NX-DFLT Circuit BoardEx
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NXAMP4x43. Operation3-1. Entry of t
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NXAMP4x4Switch the GPI jig to the G
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NXAMP4x44-15. ANALOG testPress the
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NXAMP4x4■ 71
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NXAMP4x4 73
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NXAMP4x4 7
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NXAMP4x4
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NXAMP4x41-5. Other0 dBu is defined
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NXAMP4x44-7. Channel separation1) G
Page 83 and 84: NXAMP4x4■
Page 85 and 86: NXAMP4x4
Page 87 and 88: NXAMP4x4
Page 89 and 90: NXAMP4x45) Click the [Create] butto
Page 91 and 92: NXAMP4x4 91
Page 93 and 94: NXAMP4x4■ OVERALL ASSEMBLY 1/2 8
Page 95 and 96: NXAMP4x4■ OVERALL ASSEMBLY 2/2 2
Page 97 and 98: NXAMP4x4REF NO. PART NO. DESCRIPTIO
Page 101 and 102: NXAMP4x4■ LOCATIONS OF HEAT SINK
Page 103 and 104: NXAMP4x4■ HEAT SINK UNIT L100 PS
Page 105 and 106: NXAMP4x4■ HEAT SINK UNIT L60 PSA
Page 107 and 108: NXAMP4x4■ HEAT SINK UNIT L50 PSA
Page 109 and 110: NXAMP4x4■ HEAT SINK UNIT MP-5 PA
Page 111 and 112: NXAMP4x4■ ELECTRICAL PARTS REF NO
Page 115 and 116: NXAMP4x4CONTROLREF NO. PART NO. DES
Page 123 and 124: NXAMP4x4PAANHREF NO. PART NO. DESCR
Page 131 and 132: NXAMP4x4CIRCUIT DIAGRAM■ CONTENTS
Page 133: KJIHGFEDCBANXAMP4x4■ WIRING DIAGR
Page 137 and 138: HGFEDCBANXAMP4x4■ BLOCK DIAGRAM 4
Page 139 and 140: QPONMLKJIHGFEDCBANXAMP4x4■ CIRCUI
Page 145 and 146: HGFEDCBANXAMP4x4■ CIRCUIT DIAGRAM
Page 149 and 150: LKJIHGFEDCBANXAMP4x4■ CIRCUIT DIA
Page 151 and 152: LKJIHGFEDCBANXAMP4x4■ CIRCUIT DIA
Page 153: QPONMLKJIHGFEDCBANXAMP4x4■ CIRCUI
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SERVICE MANUAL - Nexo

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