雅马哈yamaha_ax-900_schSERVICE-MANUAL维修手册电器原理图

ABDPRINTED CIRCUIT BOARD(Pattern side)1Main Circuit Board(1)Note)*C357.3C350R418,4GF302Lspping3r416660696w1113NO1cG0:Main amplifier operation aheckTo check the wawedarm of the output (speakerl.remnove tifirst.(This will prevent muting transistors Q105 to 108 frofar as the relay-ON stap.)Then using the AC regulatorsgraduslly and observe the waveform.Main Circuit Board (3)Main Circuit Board(2FROM:TRANSFORMERTO:FUNCTION (1)TO:MAIN[31￥FROM:VOLTAGESELECTOF