Yamaha RX-V1500 Service Manual page 81

A B C
SCHEMATIC DIAGRAM (OPERATION)
1
2
-25.7
3
-30.5
-33.3
4
5.4 5.4
-30.8 -30.8
-30.5 -30.5
5
6
OPE(1)
OPE(2)
7
8
9
10
D E F
FL DISPLAY
INPUT
SELECTOR
5.1 0 5.1
-33.1
-28.2
-30.7
FL DRIVER -33.1
IR
-23.9
-28.3
REMOTE -23.9
-28.3
-26.1
-21.6
-33.1
-23.6
-33.1
-21.3
-33.1
-33.1
-30.6 5.4
-28.3 2.3
-28.3 2.4
5.4
-25.6 0
-28.2 4.9
-30.8
-28.7 4.9
-30.6
-26.3 3.2
-30.8 3.1
IC902: SN74AHCT1G32DCKR
2-Input or Gate
A 1 5
B 2
GND 3 4
IC901: M66003-0101FP
FL Display Driver
CS 2 Serial
data
SCK 3 receive
circuit
SDATA 4
XIN 7
Clock
timing
generator clock
XOUT 6
RESET
1
Vcc1 8
Vcc2 18
Vss 5
Vp 64
G H
Page 79 I1
to FUNCTION
5.4 5.4 5.4
-28.5 -28.7 -25.6
-28.6 -26.1 -26.1
5.4 5.4
-28.3 -28.3
-28.5 -28.5
IC904: µPC4570G2
IC903: NJM4556AL
Dual OP-Amp Dual OP-Amp
V+
8
Vcc
OUT 1 1 8 +V CC
–IN 2 7 OUT
1 2
+ – + –
2, 6 OUTPUT
Y –INPUT
+IN 3 6 –IN
1 2
1, 7
+INPUT
3, 5
–V CC 4 5 +IN 2
V–
4
Display code
RAM CGROM
(35 bit x 166) 44 SEG00
(8-bit x 60)
Segment 19 SEG25
Code
output
write 17 SEG26
circuit
CGROM
9 SEG34
dot data
(35 bit x 16)
write
Code/
command
SEG35
control 45
circuit
DIG11/
52
SEG42
DIG12/
51
SEG41
code DIG13/
Segment
50
select digit SEG40
select/ DIG14/
49
output SEG39
Display
controller scan pulse circuit DIG15/
48
SEG38
DIG16/
47
SEG37
DIG17/
46
SEG36
63 DIG00
Digit
output
circuit
53 DIG10
I J K
OPE(3)
1 4.9
2 3
0.1 0.3
4 0
0.3
0
4.9
HEADPHONE AMP
9.7 9.0
9.0
8
4
0
3
0
0
0.7
0
0
0.7
0
6
0
5
0
4
-9.4
-9.7 -9.4
11.5
11.5
0
0
0
0
0
0
0
-12.0
★ All voltages are measured with a 10MΩ/V DC electronic volt meter.
★ Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
★ Schematic diagram is subject to change without notice.
L M N
RX-V1500/DSP-AX1500
2
0
x: NOT USED
O: USED / APPLICABLE
7
0
MIC
81