Yamaha AX-497 Servise Manual page 21

A B
SCHEMATIC DIAGRAM (FUNCTION)
1 Q Q
3 7 6 3 1 5 1 5 0
2
3
14.0
0
0
0
4
0
0
0
-14.1
14.0
0
0 0
T E
L 1 3 9 4 2 2 9 6 5 1 3
0
0
0
-14.1
5
14.0
0
0 0
0
0
6
0
-14.1
14.0
0
0 0
7
0
0
0
-14.1
IC451: NJU7313AM
Analog Function Switch
L1 2
L2 3
L3 4
L4 5
w w w
L-COM1 6
L5 7
L6 8
8
IC302, 454–457, 501, 502, 531, 532:
L-COM2 9
NJM2068MD-TE
.
Dual OP-Amp L7 10
L8 11
L-COM3 12
OUT 1 8 +V
1 CC
ST 14
–IN 1 2 7 OUT 2 CONTROL
+ – + – VDD 30
+IN 1 3 6 –IN 2
VEE 1
–V 4 5 +IN
CC 2
NC 13
C D E
14.2
15.6
0
0 0
0
0
0 0
-16.9
15.6
0
0
0.1
1K
1K
0
0 0.1
-15.7
0
0.7
0
0 CD/DVD DIRECT AMP ON
0.7
0
0
IC452: NJU7312AM
Analog Function Switch
29 R1 L1 2 29 R1
28 R2 L2 3 28 R2
27 27 IC421: LB1641
R3 L3 4 R3
Motor Driver
26 R4 L-COM1 5 26 R-COM1
25 R-COM1 L4 6 25 R4
24 R5 L5 7 24 R5
3 2 8
x a o
y
23 R6 L6 8 23 R6
22 R-COM2 22 R-COM2
L-COM2 9
i
21 R7 L7 10 21 R7
20 R8 L8 11 20 R8
19 R-COM3 L-COM3 12 19 R-COM3
17 DATA ST 14 17 DATA
CONTROL
CK VDD 30 CK
16 16
15 VSS VEE 1 15 VSS
IN 1 5 INPUT LOGIC
18 NC NC 13 18 NC GND 1
http://www.xiaoyu163.com F G
15.6 15.6
14.2
14.2 14.2
0
0
0
0 0
1.7
0.7
0
Q Q
3 7 6
CD/DVD DIRECT AMP OFF
Page 22 I-1
TO MAIN (2) W151
Point w
Point q (Pin 20 of IC301)
CH 1 : Emitter of Q309
CH 2 : Collector of Q304
10 9 7
u 1 6 3
.
VZ
4
6 IN 2
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H I
Page 22 B-6 TO MAIN (1) W2
2 4
8 9 9
PURE DIRECT ON
0
0
PURE DIRECT OFF
15.6
0
0.1
0.2
0
0
0
-16.7
4.3 4.9
4.9
5.0 5.0
-7.1
0
0
6.2
1 5.0
0
0
4.8 5.6
12.1
3 1 5 1 5 0 8 9 2
2
CH2
6.3
4.8
5.6 6.3
5.0
10.4
5.0
12.1
5.0
11.4
0
0
7.4 6.7
6.7
0
2.1 5.0
2.1 5.0
2.1 0.2
2.1 5.0
2.1 5.0
0
2.1 5.0
4.9
4.9
2.1 4.9
5.0 4.9
m
c o
↑ ↑ ↑
AC POWER ON AC POWER OFF AC POWER ON
(Connect the power cable) (Disconnect the power cable) (Connect the power cable)
J K
AX-497
2
8 9 9
14.7
0
14.7
0.1
0
0.1
0
0 0
-14.8
0
-14.8
Page 22 B-3
TO MAIN (1) CB1
Page 22 A-4
TO MAIN (3) CB201
Page 22 A-1
TO MAIN (5) CB221
Page 22 A-2
TO MAIN (6) CB226
4 9 8 2 9 9
2
CH1
* 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.
Z
21