Yamaha PORTATONE PSR E403 Service Manual page 17

IC BLOCK DIAGRAM
SN74LV32APWR (X5647A00)
DMLCD: IC207
Quad 2 Input OR
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
BA5417 (XV771A00)
PNJKSTB(PNJK): IC551
POWER AMP
T . S . D
ST. BY
BS BS
FILTER
1 2 3 4 5 6 7 8 9 10
（ICブロック図）
SN74LV138APWR (X7284A00)
DMLCD: IC401, 402
3 to 8 Demultiplexer
A 1
Select
2
B
3
C
4
G2A
Enable
5
G2B
6
G1
Output
7
Y7
8
GND
11 12 13 14 15
BA4510F-E2 (X7300A00)
DMLCD: IC502
Dual Operational Amplifier
16 Vcc
A
B Y0 15
YO
14
C Y1 Y1
G2A Y2 13 Y2
Output
G2B Y3 12 Y3
11
G1 Y4
Y4
Y7 Y5 10 Y5
Y6
9
Y6
PSR-E403
Output 1 VCC
1 +V 8
-Input 1 Output 2
2 7
- +
+Input 1 -Input 2
3 6
+ -
VEE +Input 2
4 -V 5
17