Yamaha NX-A01 Service Manual

Also see for NX-A01 - Speaker Sys: Product bulletin Owner's manual Owner's manual

Contents

A B C D E F G H I J K LNX-A0115123456789MAIN 1/2SCHEMATIC DIAGRAMS All voltages are measured with a 10MΩ/V DC electronic volt meter. Components having special characteristics are marked s and must be replacedwith parts having specifications equal to those originally installed. Schematic diagram is subject to change without notice.12.212.012.0000.76.76.712.09.00.70.700000002.62.55.15.15.15.15.15.112.00.70.712.012.0000.712.00.10.19.04.50.14.54.54.54.54.54.50.10.1004.54.54.54.54.53.94.54.54.54.54.54.54.512.012.00.7000000004.84.84.82.62.512.012.00.70.712.012.012.06.80.15.206.80 5.21.3LMAIN (1)VOLTAGEREGULATORCHOPPERREGULATORPORTABLEINno_useno_useNo replacement part avilable.TESTVSSCEDICLVDDVrefRVrefLVrefCCBINTERFACEZERO CROSSDETMULTIPLEXERMULTIPLEXERLOGIC CIRCUITCONTROLCIRCUITZERO CROSSDETNO SIGNALTIMERTIMLOUT 567891011 12 13 14 15 16 17 18 19 20212223242526272829301234ROUTLBASS2LBASS1LTRELINLSELOL4L3L2L1R1NCNCR2R3R4RSELORINRTRERBASS1RBASS2IC301 : LC75348MSingle-chip electronic volume and tone control systemVOUTGNDVINThermalProtectionBandgapReferenceNOISEBYPASSCONTIC306 : NJM2370UVoltage regulator1 2 35 41. CONTROL2. GND3. NOISE BYPASS4. V OUT5. V INIC304 : YDA138Digital audio power amplifierVoltageregulatorOvercurrentdetectioncircuitOverheatdetectioncircuitON/OFFcircuitQ+-RSF/F25413COMPWM COMP.VIN VOUTON/OFF controlOadjV refERROR AMP.Soft startOscillatorIC305 : PQ1CZ38M2ZPHChopper regulators+-DC IN 12Vto MAIN(2)_CB502Page 16 I2