Yamaha AX-497 Servise Manual - Page 21
Browse online or download pdf Servise Manual for Amplifier Yamaha AX-497. Yamaha AX-497 36 pages. Stereo amplifier
Also for Yamaha AX-497: Owner's Manual (23 pages), Owner's Manual (24 pages)
Print Page
- 1. Table of Contents
- 2. Important Notice
- 3. To Service Personnel
- 4. Impedance Selector
- 5. Remote Control Panel
- 6. Front Panel
- 7. Rear Panels
- 8. Specifications
- 9. Internal View
- 10. Disassembly Procedures
- 11. Adjustment
- 12. IC Data / Block Diagram
- 13. Pin Connection Diagram / Printed Circuit Board
- 14. Parts List
- 15. Exploded View
- 16. Remote Control Rax15
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
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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