Yamaha RX-797 Service Manual page 33

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