Yamaha P-250 Service Manual page 21

IC BLOCK DIAGRAM
TC74VHC14FT (XV890A00)
Hex Inverter
DM: IC006
1A 1 1 VDD
1Y 6A
2 2
2A 6Y
3 3
2Y 4 4 5A
3A 5 5 5Y
3Y 6 6 4A
GND 4Y
7 7
SN75C1168NSR (XU073A00)
Line Driver/Receiver
DJK: IC002
1B 1 16 Vcc
1A 2 1D
15
1R 3 14 1Y
1DE 1Z
4
13
2R 5 2DE
12
2A 6 11 2Z
2B 7 2Y
10
GND 2D
8
9
M5229FP (XY487A00)
7 Band Graphic Equalizer
AJK: IC300, 400
IN1
1 20
NF1
2 19
IN2
3 18
NF2
4 17
IN3
5 16
NF3
6 15
IN4
7 14
NF4
8 13
IN5
9 12
NF5
10 11
（IC ブロック図）
TC74VHC32FT (XY945A00)
Quad 2 Input OR
DM: IC007
1A
1
1B
2
1Y
3
2A
4
2B
5
2Y
6
GND
7
TC7SU04F (XY447A00)
Inverter Gate
DJK: IC001
NC 1
IN
2
VSS 3
µPC4570G2 (XF291A00)
Dual Operational Amplifier
AJK: IC100
DM: IC033-35
PN-EQ: IC100
PNL: IC073
-Vcc
GND
+Vcc
Output A
1
OUTPUT
Inverting
2
INVERTED
Input A
INPUT
Non-Inverting
3
NON-INVRTED
Input A
INPUT
-DC Voltage Supply -V
4
NF7
IN7
NF6
IN6
Vcc
14
4B
13
4A
12
4Y
11
3B
10
3A
9
3Y
8
5 VDD
4 OUT
+DC Voltage
+V 8
Supply
Output B
7
- +
Inverting
6
+ -
Input B
Non-Inverting
5
Input B
TC74VHCT245AFT (XT744A00)
Octal 3-State Bus Transceiver
DM: IC009, 010
D1R Vcc
1 20
A1 2 19 G
A2 3 18 B1
A3 4 17 B2
A4 B3
5 16
A5 B4
6 15
A6 B5
7 14
A7 8 13 B6
A8 9 12 B7
GND 10 11 B8
TC7WH32FU(TE12L) (XY364A00)
Dual 2 Input OR Gate
DM: IC013
1A 1 8 Vcc
1Y
1B 2 7
2Y
3 6 2B
2A
GND 4 5
LA6517M-TE-R (XT131A00)
Dual Low Voltage Power Amplifier
AJK: IC200
1
NC 16 NC
NC 2 15 NC
OUT1 3 Amp1 INPUT-1
14
Vcc 4 INPUT+1
13
Thermal Shut
Doun and
Current Limiter
OUT2 5 INPUT+2
12
Amp2
6
VEE 11 INPUT-2
NC NC
7 10
NC NC
8
9
P-250
21