Yamaha PSR-1500 Service Manual page 34

PSR-1500/PSR-3000
(X5154A00)
LT1945EMS#TR
DC-DC Converter
DM: IC017 (PSR-1500)
NFB1 SW1
1 10
SHDN1 PGND
2 9
GND V
IN
3 8
SHDN2 PGND
4 7
FB2
5 6 SW2
µPC4570G2
(XF291A00)
Dual Operational Amplifier
AM: IC013,050,055,064,093
DAC1A: IC302,402,404
Output A
1
Inverting
2
Input A
- +
Non-Inverting
3
+
Input A
-DC Voltage Supply
4 -V
(XQ619A00)
LA4705NA
Power Amplifier
AM: IC051
34
V
IN
C1
V
OUT1
R1
NFB1
(EXTERMINAL)
1
R2
(EXTERMINAL)
NJM12904M(TE1)
Operational Amplifier
DJK: IC070
Output A
+DC Voltage
Inverting
+V 8
Supply
Output B Non-Inverting
7
Inverting
6
-
Input B
Non-Inverting
5
Input B
C3
L1
L2
D1
V SHDN1 SW1
IN
8 2 10
R5 R6
80k 80k
A1
+
ENABLE
-
Q1
Q2 400ns
Q3
X10
ONE-SHOT
DRIVER
R3
RESET
60k
+
R4
0.12Ω
280k
-
42mV
A2
SWITCHER 1
PGND
GND
3 9
(X5475A00)
+DC Voltage
1 +V 8
Supply
Output B
2 7
Input A - +
Inverting
3 6
+ -
Input A Input B
Non-Inverting
Ground
4 5
Input B
D2
L3
V V
OUT1 OUT2
C2 C4
SW2 SHDN2
6 4
V
IN
R6B R5B
40k 40k
A1B
+
ENABLE
-
Q1B
400ns
Q3B O2B
ONE-SHOT
X10
DRIVER
R3B
RESET
30k
+
R4B
0.12Ω
140k
-
42mV
A2B
SWITCHER 2
PGND
7
µPC4574G2
(XE518A00)
Quad Operational Amplifier
AM: IC021,022,031,032,043
OUT A
1
2 - +
-IN A
+IN A
3
+V
DD 4 +V
+IN B 5
6
-IN B
OUT B 7
V
IN
V
OUT2
R1B
FB2
(EXTERMINAL)
5
R2B
(EXTERMINAL)
14 OUT D
13
-IN D
+ -
+IN D
12
-V
11 SS
-V
+IN C
10
+ - 9 -IN C
8 OUT C