Technics SX-PX554 Service Manual page 78

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MAC
PC1
COMPUTER
PC2
MIDI
IC1
SOFT,
SODU,
MRXD MTXD
SUST
H E
COM MKB1
SW1
JK1
CN1
CN8
IC3
CRXD CTXD MAC,PC1,
PC2,MIDI
16BIT
MICROCOMPUTER
IC6 IC8
D0 D19 D8 D15
4M BIT 256K BIT
PROGRAMMED STATIC
ROM RAM
A1 A18 A1 A15
09/08/2012
IC1
DECODER
SWITCHES
&
DIODES
CN2
CN4
KDB0
KF0 KF3, KS0
A1 A20
D0 D15
DATA BUS
IC9
D0 D7
256K BIT
STATIC
RAM
A1 A15
ADDRESS BUS
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F
MKB2
CN8 CN4
IC2
DECODER
CN9 CN7
SWITCHES & DIODES
IC10
SDOMIX RXD,TXD,SCKIN,SCKOUT
KDB4 KDB0 KDB4
KS3 KF0 KF3, KS0 KS3
TONE
A1 A4
GENERATOR
LSI
D0 D15
IC16
SDOMIX
TONE
D0 D15
GENERATOR
LSI
A1 A4
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IC3
DECODER
D0 D15
D0 D7
A0 A14
A0 A19
D0 D15
D0 D7
A0 A14
A0 A19