Yamaha Portable Grand DGX-630, Service Manual

Page: 27 / 81

27
DGX-630/YPG-635
■
IC BLOCK DIAGRAM
（IC ブロック図）
SN74LV08APWR (X4463A00)
Quad 2 Input AND
1
2
3
1A
1Y
4
2A
5
2B
6
2Y
7
VSS
1B
14
13
12
VDD
4A
11
4Y
10
3B
9
3A
8
3Y
4B
DM: IC13
SN74LV14APWR (X6688A0R)
Hex Inverter
1
1A
2 1Y
3
2A
4
2Y
5
3A
6
3Y
7 GND
14
VDD
13 6A
12
6Y
11
5A
10
5Y
9
4A
8 4Y
DM: IC20
SN74AHCT1G08DCKR (X0158A0R)
Single 2-Input Positive-AND Gate
1
2
3
A
B
GND
5
4
Vcc
Y
INPUTS
FUNCTION TABLE
OUTPUT
A B Y
H
L
L
H
X
L
H
L
X
DM: IC12,15
NJM4580E(TE2) (X2331A0R)
Dual Operational Amplifier
1
2
3
4 -V
8
7
6
5
Output A +V
Non-Inverting
Input A
-DC Voltage Supply
+DC Voltage
Supply
Output B
Inverting
Input B
Non-Inverting
Input B
Inverting
Input A
+ -
+ -
DM: IC16
R5520H001B-T1-F
(X7569A00)
USB High-Side Power Switch
GATE
CONTROL
5 OUT
3 FLG
2
GND
4 IN
1
EN
CURRENT
LIMIT
UVLO
THERMAL
SHUTDOWN
FLAG
DELAY
1 5
2
3 4
EN
FLG
OUT
IN
GND
DM: IC18
-OUT2
+OUT2
RIPPLE
FILTER
BIAS
CIRCUIT
STANDBY
SW
POP NOISE
PREVENTION
CIRCUIT
PREDRIVER
PREDRIVER
POWER
POWER
LOAD SHORT
PROTECTOR
OUTPUT PIN TO V
CC
SHORT PROTECTOR
OUTPUT PIN TO V
CC
SHORT PROTECTOR
OUTPUT PIN TO GND
SHORT PROTECTOR
OUTPUT PIN TO GND
SHORT PROTECTOR
PREDRIVER
PREDRIVER
POWER
POWER
OVER VOLTAGE/
SURGE
THERMAL
SHUT DOWN
LOAD SHORT
PROTECTOR
V
CC
-OUT1
+OUT1
POWER
GND2
+
-
IN
+
-
IN
IN2
POWER
GND1
14 2
1
3
4
6
7 5
8
10
9
11
12
13
IN1
PRE-GND
STBY
ON TIME POP
PWR-GND2
PWR-GND1
V
CC
DC
LA4625 (XY209A0R)
Power Amplifier 13.5W
AM: IC201
MC34063EBD-TR (X7371A00)
DC-DC Converter
DM: IC19
S Q
R
Q2
Q1
100
Ipk
Oscillator CT
Comparator
+
±
1.25 V
Reference
Regulator
Drive
Collector
Ipk
Sense
VCC
Comparator
Inverting
Input
Switch
Collector
Switch
Emitter
Timing
Capacitor
Gnd
8
7
6
5 4
3
2
1