Yamaha NX-A01 Service Manual
Also see for NX-A01 - Speaker Sys: Product bulletinOwner's manualOwner's manual
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NX-A016NX-A01 TROUBLESHOOTINGCheck thecable connectionsReconnect cablesand check againCheck the fault in thepower supply section(1) +12V and +12VA for system is OK?(2) +5V for system is OK?Trouble of microproce-ssor (IC501) or LEDs(D506, 509-511) circuitin MAIN (2) P.C.B.Good conditionCheck the power supplyDoesstatus indicator lightwhen "STANDBY/ON" keyis pressed?Step 1OKNGNGNOOKYESStep 2Step 3• When the status indicator does not light evenwhen "STANDBY/ON" key is pressed• When no sound is producedCheck thecable connectionsReconnect cablesand check again• Trouble of audio circuit(IC301 and peripheral cir-cuit) in MAIN (1) P.C.B.• Trouble of amplifier circuit(IC304 and peripheral cir-cuit) in MAIN (1) P.C.B.• Trouble of microprocessor(IC501) circuitin MAIN (2) P.C.B.Good conditionIs the sound produced?Check the powerwhen the power isturned on.Step 1OKNGNGNOOKYESStep 2Step 3(1) +12V and +12VA for system is OK?(2) +VA and +5V for system is OK?Check the fault in thepower supply section• Trouble of microprocessor (IC501) circuit inMAIN (2) P.C.B.Checkmicroprocessor (IC501)clockMicroprocessor (IC501)may work wellX'tal (XL501)defectiveTrouble of RESET circuit(Q501 and peripheral cir-cuit)14 and 15 pins of microprocessor (IC501) is OK?18 pin of microprocessor (IC501) is OK?Step 1OKNGNGOKStep 2Check the RESET signal |
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