(4) A-9V , A+9V: used to supply power for audio power amplifying chip F4558 and mute circuit.
(5) D+3V3: power supply of MT1389, FLASH, U211SDRAM and 74HCU04.
(7) A+5V (pin 1, 2 of XS504): supply power for power amplifier board A/D conversion ship Cs5340.
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