AIWA MM-VX100
Service Manual

IC DESCRIPTION IC, HD6473837UX
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 ~ 30 31 32 33 34 35 36 37 38 39 40 41 42 43 Pin Name LCD TP AVSS TEST X2 X1 VSS OSC1 OSC2 RESET MODE SDA SCL PWAD LCD RST KOUT0 KOUT1 NC DAC RST ENC/DEC DEC PUP DEC WRDY SCK2 NC SO2 PWR DEC PWR AMP VSS NC VCC LCD RD LCD WR LCD RS LCD CS KIN0 KIN1 KIN2 KIN3 KIN4 KIN5 KIN6 KIN7 I/O I � I O I � I O I I I/O I/O O O O O � O O I I O � O O O � � � O O O O I I I I I I I I LCD TEST PIN A/D Converter ground PIN Not for use in appllication systems. It should be connected to Vss. 32.768Khz crystal 32.768Khz crystal Ground 5MHz crystal 5MHz crystal When the this pin is driven low the chip is reset This pin controls system clock oscillation in the reset state. "IIC data line (MAS3507D,DAC3550A)" "IIC clock line (MAS3507D,DAC3550A)" Power down (AK4518) LCD RESET# (KS0713) Key scan out 0 Key scan out 1 Not connected DAC3550A RESET "H"=Encode (MP3/ADPCM), "L"=Decode(ADPCM) MAS3507D Power Up MAS2507D Ready MP3/ADPCM bitstreem clock out Not connected MP3/ADPCM bitstreem data out Power control Power control Ground Not connected 2.9V LCD read control pin LCD write control pin "LCD register select pin(L=control,H=data)" LCD chip select pin Key in 0(REPEAT/REC KEY)Pull-UP Key in 1(BASS/REW KEY)Pull-UP Key in 2(VOICE/STOP KEY)Pull-UP Key in 3(MP3/VOLUME_UP KEY)Pull-UP Key in 4(ERASE/VOLUME_DOWN KEY)Pull-UP Key in 5(A/B KEY) Pull-UP Key in 6(PLAY KEY)Pull-UP Key in 7(HOLD KEY)Pull-UP Description

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