Schematic Diagram - Yamaha RX-797 Service Manual

A B
RX-797
SCHEMATIC DIAGRAM (OPERATION)
1
CD DIRECT AMP ON
CD DIRECT AMP OFF
2
PURE DIRECT OFF
0
13.0
0
0
3
0
0 0
4 -12.8
CD DIRECT AMP OFF
5
-21.1
-19.5
-21.1
-16.2
-17.8
-19.4
-17.8
-16.0
-16.1
-16.2
-17.8
-21.2
6
4.8
-19.5
-19.4
0 0
7
8
32
C D E
11.7
13.9
0 0
0 0
0
-14.6
0
0 -14.6
0
PURE DIRECT ON
-16.2
-16.2
-16.2
-19.5
-17.8
-16.2
-16.2
-14.6
2.1
2.2
0
4.8
4.8
4.8
4.8
0 0
Page 33 B-1
TO MAIN (4) CB283
F G
IC301, 302, 401, 751:
NJM2068MD-TE
Dual OP-Amp
15.1 13.7
15.1 13.7
OUT 1 1 8 +V CC
–IN 2 7 OUT
1 2
+ – + –
3
+IN 1 6 –IN 2
–V CC 4 5 +IN 2
0.1
0
IC431: LB1641
Motor Driver
0
0.6
0.8
0 0.8
4.7
4.7
15.1
13.4
0.8
0.6
IN 1 5
GND 1
-15.7
-18.5
-18.5
-21.3
H I
PURE DIRECT OFF
14.4
0.1
0.1
0.1
0.7
-14.3
3 2 8 10 9 7
IC801: M66003-0131FP
Display Driver
4 VZ Display code
RAM
(8-bit x 60)
Code
write
Serial dot data
CS 2 data
write
receive
SCK 3
Code/
INPUT LOGIC 6 IN 2 circuit
SDATA 4
command
control
circuit
code
select
XIN 7
Clock
timing Display
generator clock
XOUT controller
6
RESET 1
Vcc1 8
Vcc2 18
Vss 5
Vp 64
14.7
0
0 0
CD DIRECT AMP OFF
0
0
0
-14.5
14.7
0
0
0
0
0
0
0
0
0 0
-14.5
J K
CGROM
44 SEG00
(35 bit x 166)
Segment 19 SEG25
output
17 SEG26
circuit
CGROM
9 SEG34
(35 bit x 16)
45 SEG35
DIG11/
52
SEG42
DIG12/
51
SEG41
Segment DIG13/
50
digit SEG40
select/ DIG14/
49
output SEG39
scan pulse circuit DIG15/
48
SEG38
DIG16/
47
SEG37
DIG17/
46
SEG36
63 DIG00
Digit
output
circuit
53 DIG10
0.8
CD DIRECT AMP ON
0.8
* All voltages are measured with a 10M Ω /V DC electronic volt meter.
* Components having special characteristics are marked Z and
must be replaced with parts having specifications equal to
those originally installed.
* Schematic diagram is subject to change without notice.
L