Yamaha RX-797, Service Manual

Page: 33 / 46

A B C D E F G H
1
2
3
4
5
6
I J K
7
8
RX-797
33
* 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.
■
SCHEMATIC DIAGRAM (MAIN)
0
0.9
6.0
0
0
0.7
0.6
0.6 0.6
0.1 0.1
-54.7
-54.7 -55.8
-55.8
-55.8
-54.7
-54.1
-54.8
-54.7
-54.7
-54.7
-54.7
-54.8
-54.8
-55.3
-54.8
1.2
1.2
1.1
1.6
0.6
0.6
55.7
55.7
55.7
55.7
55.6
55.4
-1.0
-1.1 -1.1
-0.4
-0.5
-0.5
-0.5
0
0
0
0
0
0
0
0
0
0
0
0.1
0.6
0.6
0.6
0.7
0.7 0.7
0.1 0.1
1.2
1.2
1.2
-54.2
55.4
55.7
55.7
55.7 55.2
54.6
54.6
54.6
55.2
55.7
-54.2
-54.2
-54.8
-54.8
-54.8
-54.8
-54.8
-54.7
-54.7
-54.8 -54.7
-54.7
-55.3 -55.3
-54.2
-0.5
-0.5
-0.5
-1.0
-1.0
-1.0
-0.5
0
0 0
0
0
0
0
0
0
0
0
0
0
0.8
0.1
0.1
0
0.2
0.2
4.7
4.9
6.9
4.9
4.8
5.4
3.4
3.7
23.9
23.9
-18.3
-28.3
-28.2
-28.5
-22.8
-29.1
-29.1
-29.1
-29.1
-29.1
-29.1
-29.1
9.9
9.9
~
~
~ ~
~
~
~
~
~
~
-29.1
-29.1
9.8
0
0
54.6 54.6
55.2
55.2
55.2
55.2
0.1
0
0.9
6.0
15.1
15.6
15.6
-15.5
-15.5
19.1
19.1
-21.5
-21.6
-21.6
19.1
19.1
19.1
19.2 19.2
19.1
55.7 (45.1)
AC81.4
-55.8
(-45.1)
-5.7 -19.6
-33.2 0.1
-19.6
-19.6
-19.6
0
0 0
0
0 0
0
0 0.7
0.1
-32.6
19.0
-19.6
-14.9
-14.8
-19.0
AC66.0
AC30.9
AC6.5
2
CH1
2
CH2
TO OPERATION (1) W802
Page 32 E-8
TO FUNCTION (2) CB605 TO POWER TRANSFORMER
Page 31 F-4
T
O
OPERA
TION (2)
W404
P
age 32 E-2
T
O
MAIN (2) CB257
P
age 33 K-6
TO MAIN (5) W291
TO POWER TRANSFORMER
or
Page 33 I-4
TO POWER TRANSFORMER
T
O
PO
WER
TRANSFORMER
SPEAKERS
Vout
+Vs
GND
IC101, 102 : LM61CIZ
Temperature Sensor
IC252 : TC4013BP
Dual D Flip Flop
1
2
3
4
5
6
7
1Q
1CP
1CL
1PR
1DATA
1Q
VSS
14
13
12
11
10
9
8
VDD
2Q
2CP
2CL
2PR
2DATA
Q
CP
CL
Q
D
PR
2Q
Q
CP
CL
Q
D
PR
Point
w
CH 1 : (+) of C272
CH 2 : Collector of Q271
↑
AC POWER ON
(Connect the power cable)
↑
AC POWER OFF
(Disconnect the power cable)
↑
AC POWER ON
(Connect the power cable)