Yamaha Portatone YPT-300 Service Manual - Page 13

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Yamaha Portatone YPT-300 Service Manual
IC BLOCK DIAGRAM
HD74LV32AFPEL (IS003200)
Quad 2 Input OR
DMLCD: IC204
1A
Vcc
1
14
1B
4B
2
13
1Y
4A
3
12
2A
4Y
4
11
2B
3B
5
10
2Y
3A
6
9
GND
3Y
7
8
AK4385ET (X6040A00)
D/A Converter
DMLCD: IC431
MCLK
DZFL
1
16
2
15
BICK
DZFR
3
14
SDTI
VDD
LRCK
4
13
VSS
5
12
PDN
AOUTL+
CSN
AOUTL-
6
11
7
CCLK
7
10
8
AOUTR+
CDTI
AOUTR-
8
9
NJM4580E (X2331A00)
Dual Operational Amplifier
DMLCD: IC432
A Output
-
A
INPUT
A+INPUT
-
V
De-emphasis
CSN
µP
Control
CCLK
Interface
CDTI
8X
LRCK
Audio
Interpolator
Data
BICK
Interface
8X
SDTI
Interpolator
PDN
+
V
1
+V
8
B Output
2
7
-
+
-
B
INPUT
3
6
+
-
B +INPUT
4
-V
5
MCLK
Clock
Divider
∆Σ
SCF
Modulator
∆Σ
SCF
Modulator
PSR-E303/YPT-300
SN74LV138ANSR (ISO013810)
DECODER
DMLCD: IC831,832
A
1
16
A
Select
2
B
Y0
15
B
3
14
C
Y1
C
4
G2A
G2A
Y2
13
Enable
5
G2B
Y3
12
G2B
6
11
G1
Y4
G1
Output
7
Y7
10
Y7
Y5
Y6
8
GND
9
VDD
VSS
DZFL
DZFR
AOUTL+
AOUTL-
AOUTR+
AOUTR-
Vcc
YO
Y1
Y2
Output
Y3
Y4
Y5
Y6
13