Yamaha KB-180 Service Manual - Page 16

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Yamaha KB-180 Service Manual
KB-180/SKB-180
AK4385ET (X6040A00) DAC (Digital to Analog Converter)
PIN
NAME
I/O
NO.
1
MCLK
I
2
BICK
I
3
SDTI
I
4
LRCK
I
5
PDN
I
6
CSN
I
7
CCLK
I
8
CDTI
I

IC BLOCK DIAGRAM

SN74LV32APWR (X5647A00)
Quad 2 Input OR
DMLCD: IC207
1A
1
1B
2
1Y
3
2A
4
2B
5
2Y
6
GND
7
LA4625 ( XY209A00 )
Power Amplifier
AM: IC551
DC
2
RIPPLE
FILTER
PREDRIVER
IN1
1
+
IN
-
PREDRIVER
PRE-GND
3
BIAS
CIRCUIT
STANDBY
STBY
4
SW
PREDRIVER
IN2
6
+
IN
-
PREDRIVER
POP NOISE
PREVENTION
CIRCUIT
5
7
ON TIME
POP
16
FUNCTION
Master Clock
Audio Serial Data Clock
Audio Serial Date Input
L/R Clock
Power Down mode
Chip Select
Control Data Input
Control Data Input
SN74LV138APWR (X7284A00)
3 to 8 Demultiplexer
DMLCD: IC401, 402
Vcc
14
4B
13
Select
4A
12
4Y
11
G2A
Enable
3B
10
G2B
3A
9
Output
3Y
8
GND
V
CC
14
OUTPUT PIN TO V
CC
SHORT PROTECTOR
-OUT1
13
POWER
LOAD SHORT
POWER
PWR-GND1
12
PROTECTOR
GND1
11
+OUT1
POWER
OUTPUT PIN TO GND
OVER VOLTAGE/
SHORT PROTECTOR
SURGE
V
CC
THERMAL
OUTPUT PIN TO GND
SHUT DOWN
SHORT PROTECTOR
-OUT2
9
POWER
LOAD SHORT
POWER
PWR-GND2
10
PROTECTOR
GND2
+OUT2
8
POWER
OUTPUT PIN TO V
CC
SHORT PROTECTOR
PIN
NAME
I/O
NO.
9
AOUTR-
O
10
AOUTR+
O
11
AOUTL-
O
12
AOUTL+
O
13
Vss
-
14
VDD
-
15
DZFR
O
16
DZFL
O
A
1
16
Vcc
A
2
B
Y0
15
B
YO
3
14
C
C
Y1
Y1
4
13
G2A
Y2
Y2
Output
5
12
G2B
Y3
Y3
6
11
G1
Y4
G1
Y4
7
Y7
Y7
Y5
10
Y5
Y6
8
9
Y6
DMLCD: IC501
FUNCTION
Rch Analog out(-)
Rch Analog out(+)
Lch Analog out(-)
Lch Analog out(+)
Ground
Power Supply
Rch Data Zero Input Detect
Lch Data Zero Input Detect
BA4510F-E2 (X7300A00)
Dual Operational Amplifier
DMLCD: IC502
Output 1
VCC
1
+V
8
-Input 1
Output 2
2
7
-
+
+Input 1
-Input 2
3
6
+
-
VEE
+Input 2
4
-V
5