Yamaha RX-497 Service Manual page 31

A B
SCHEMATIC DIAGRAM (MAIN)
1
IC102 : LM61CIZ
Temperature Sensor
+Vs
Vout
Page 30 D-8
GND
TO OPERATION (1) W801
2
6.0
0.9
0
6.0
0
29.3
3
5.2
5.2
4.2
3.6
4
5
0.6 0.6
0.1 0.1
-49.8 -50.6
6
7
-49.8 -50.6
0.1 0.1
0.6 0.6
8
C D E
TO POWER TRANSFORMER
Page 29 F-3
TO FUNCTION (2) CB605
29.3 29.3 29.3
-0.4
15.3 35.9
36.0
5.2 15.3
14.7
29.3
15.3
5.2 29.3
4.3 0
15.3
0
3.6
0
0
-15.1
-14.5
22.4
51.0
50.9
51.0
0
51.0
1.1
-0.5
0.5
50.9
1.1
0
0
-0.4
0
-1.1
0
0
-0.4
-0.5
-1.1
0
-51.1
-1.1
-51.1
-49.8
-50.3
-50.3
-49.8
-51.1
-51.1
-1.0
-1.0 0
-0.5
0
0
-1.0
0
-0.4 0
0
50.7
1.1
0.6
0.6
1.1
51.0
51.0
F G
36.0
51.0
(37.3)
0 0
AC74.2
0 0
-36.1
-51.1
(-37.3)
AC54.3
H I
Point w
CH 1 : (+) of C252
CH 2 : Collector of Q251
↑ ↑
AC POWER ON AC POWER OFF
(Connect the power cable) (Disconnect the power cable)
IC252 : TC4013BP
Dual D Flip Flop
1
1Q 14 VDD
Q
1Q 2 Q 13 2Q
Q
3 2Q
1CP CP Q 12
1CL 4 CL CP 11 2CP
5 D 10
1DATA CL 2CL
TO POWER CABLE
1PR 6 PR D 9 2DATA
VSS 7 PR 8 2PR
TO POWER TRANSFORMER
2 2
CH2 CH1
4.8
4.9
4.7 ~
0
4.7 ~
4.9
0.2
0.2
4.7
0
0
0 0 ~
0
0
0.8
0.1
9.8 1.1
~
9.8 0
~
J K
RX-497
↑
AC POWER ON
(Connect the power cable)
Page 30 G-5
TO POWER TRANSFORMER
TO OPERATION (12) CB282
or
Page 31 G-5
TO MAIN (4) W291
~
~
~
~ ~ ~
~ AC5.1
~ ~
~ ~
~ ~
~ ~ ~
~
~ ~
~
~ ~
~
0 ~
0.1 9.8
~
1.0
* 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.
31