Yamaha AX-496 Service Manual page 20

A B
AX-496
SCHEMATIC DIAGRAM
1
2
From FUNCTION (7)
3
see page 26
-15.2
4
To/From FUNCTION (1)
see page 26
5
0
-2.5
0
From FUNCTION (6)
see page 26
6
0
-2.5
0
7
8
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
2SD1915F 2SA1145 2SC4488
2SC1740S 2SA970
DTC144ES 2SC2705
2SA933S 2SC1815
2SA1015
2SC2240
2SA893A
2SC1890A
E
C B E
C
B
9
27
C D E
23.6
0.1
15.2 18.4
18.3
15.8
0
0
15.8
-18.3
0
0
-15.8
-15.8
-18.3
POWER AMP
50.0
49.5
49.5
50.0
49.0
1.1
1.1
0.5
1.1
-0.5
-1.1
0.6 0.6
0
0
48.8 48.7
-0.5
-48.8 -48.7
-1.1 -1.1
-50.0
-48.1
-48.8
-48.8 -48.7 -48.8
0
-48.7
-49.3
-0.3
-49.1 -49.1
-49.0
-49.0
-49.0 -49.0
-49.0 -49.0
-50.0
-48.3
-1.1
-1.1
-49.0 -49.0
-0.5
-49.0
-49.0
0
0
0.6 0.6
-1.1
-0.5
1.1
0.6
1.1 1.1
48.9
50.0
49.2
49.3
50.0
2SA1695
2SA1358 S4VB20 DIODES
2SC4466
Anode
–
~
~
+
B
Cathode
C
B
E C
E B C
E
F G
AX-496
12.8
12.8
6.2
0.1
0.7
0
0
POWER SUPPLY
RELAY DRIVER
IMPEDANCE SELECTOR
42.9 0
POWER SUPPLY
23.6 42.9
AC78.0
50.1
0.1
43.1
0.1 0.1
0.7 0.7 0
0 0
0 0 0
-50.0
50.0
50.0
50.0
50.0
0.5
0
0
0
0
0
-0.5
-50.0
0
0
0
0
-50.0
-0.5
0
0
0
0
0.5 50.0
50.0
All voltage are measured with a 10MW/V DC electric volt meter.
Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
Schematic diagram is subject to change without notice.
H I
POWER
AC12.6
5.8
J K L
= used