Schematic Diagram - Yamaha RX-397 Service Manual

A B
RX-397
SCHEMATIC DIAGRAM (OPERATION)
1
2
PURE DIRECT OFF
0.1
0.1
0
3
0.1
0.1
0
4
5
-21.2
-14.4
-19.6
-21.3
-19.3
-14.8
-15.8
-13.9
-12.7
-12.7
-13.9
-12.4
6
4.8
-19.8
-19.4
0
7
8
30
C D E
14.5 13.1
13.1
0
0
0
-14.4
0
0 -14.4
0
PURE DIRECT ON
-21.4
-16.0
-21.4
-21.4
-13.1
-18.8
-19.9
~
~
-12.7
-18.8
4.8
2.1
2.1
-21.6
0
4.7
4.7
4.7
4.7
0
-22.3
-22.3
-21.6 -27.7 -27.7
-28.8
Page 31 B-2
TO MAIN (1) CB103
F G H
IC301, 401, 751: NJM2068MD-TE
Dual OP-Amp
OUT 1 1 8 +V CC
–IN 2 7 OUT
1 2
+ – + –
+IN 1 3 6 –IN 2
–V 4 5 +IN
CC 2
PURE DIRECT OFF
14.0
0
0
0.1
0
0
0.1
-14.0
IC431: LB1641
Motor Driver
3 2 8 10 9 7
0
0.6
0.8
1.4
1.8 4 VZ
1.8
14.1
14.1
0.8
0.6
IN 1 5 INPUT LOGIC IN 2
6
GND 1
Page 31 J-5
TO MAIN (2) W293
I J
IC801: M66003-0131FP
Display Driver
Display code
CGROM
RAM
44 SEG00
(35 bit x 166)
(8-bit x 60)
Segment 19 SEG25
Code
output
write 17 SEG26
circuit
CGROM
Serial dot data 9 SEG34
CS 2 data (35 bit x 16)
write
receive
SCK 3
Code/
circuit
SDATA 4
command
45 SEG35
control
circuit
DIG11/
52
SEG42
DIG12/
51
SEG41
code Segment DIG13/
50
select
digit SEG40
select/ DIG14/
49
XIN 7
Clock output SEG39
timing Display
generator clock scan pulse circuit DIG15/
XOUT controller 48
6
SEG38
DIG16/
47
SEG37
DIG17/
46
SEG36
63 DIG00
Digit
RESET 1 output
circuit
Vcc1 8
53 DIG10
Vcc2 18
Vss 5
Vp 64
12.6
0
0
0
0
0
0
-12.6
* 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.
K L