Yamaha AX-496, Руководство по обслуживанию

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A
1
2
3
4
5
6
7
8
9
B C D E F G H I J K L
AX-496
★ All voltage are measured with a 10M
W
/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.
26
SCHEMATIC DIAGRAM
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
BC
E
2SA1695
2SC4466 2SA1145
2SA970
2SC2705
2SC1815
2SA1015
2SC2240
2SA893A
2SC1890A S4VB20 2SA1358 2SC4488 2SD1915F
2SC1740S
DTC144ES
2SA933S
E E
C
C
B
B
E
C B
+
–
~
~
E
C
B
DIODES
Anode
Cathode
NJM2068LD
1
8
LB1641 LC78211
1
10
TC4053BP
1
8
16
M37478M4-408SP
1
21
42
1
15
30
2 3
P1
5
IN 1
1
GND
4 VZ
6
IN 2
OUT
1
8
VCC 2
10
OUT
2
9
P2
INPUT LOGIC
PRE DRIVER
7
VCC 1
8 7 6 5 4 3 2 1
OUT
1
–
Vcc
+IN
2
–
IN
2
OUT
2
+Vcc
+IN
1
–
IN
1
NJM2068LD
LC78211
Point
1
and
2
Emitter of Q108
Collector of Q104
Point
3
Pin 20 of IC101
LB1641
AX-496
To MAIN (1)
see page 27
CD/DVD DIRECT
AMP OFF
CD/DVD DIRECT AMP ON
CD/DVD DIRECT AMP &
PURE DIRECT OFF
To MAIN (1)
see page 27
To/From MAIN (3)
see page 27
12.6
-12.7
14.2
-14.3
0
0
0
0
0 0 0
0
0
0
0
0
0
0
0
0
0
0 0
0
0
0 0
0
0
0 0 0 0
0 0
0
0
0 0 0 0 0 0 0 0 0 0 0
0
0 0.5
0.5
0.7
0.7 0.7
1.8 1.8
14.8 14.8
0
0
0
0 0
0
14.7
14.7
14.7
14.7
-14.8
-14.8
4.8 4.8
0
0
0
0
0
0 0 0 0 0
0
0
0
0
0.7
0.7
4.8
4.7 4.7 4.7 4.7 4.7 4.7
4.7
4.8
4.8 2.9 4.8 4.8
4.8
4.8 4.8 4.8
4.8
4.8 4.8 4.8
4.8 4.8 4.8 4.8 4.8
4.7 4.7 1.8 0.9
1.7
4.7
4.7
4.7 4.8 0.2 4.8 4.8
4.8
2.2 2.3 0 0
0
0
4.8
0
0.9
0.6
0
0
0
0
0
0
0
0
0
0
1
2
3
0
6.1
6.1
5.4
5.4
5.4
4.8
4.7
6.5
6.5
12.1
12.8 12.8
12.8
4.8
0
0
0
0
0
0
0
-14.2
14.2
0
0
4.8
4.8
0.7
-1.7
-2.0
-5.0
14.6
14.6
1.7
0
0
0
0
0
0
0
0.1
0.1
-0.1
-0.1
-14.3
-14.3
14.3
14.3
0
PHONO EQ AMP
CD BUFFER
INPUT SELECTOR
MOTOR DRIVER
SYSTEM
CONTROL
RESET
PROTECTION
VOLUME AMP
TONE CONTROL AMP
8
7
5
6
8
7
5
6
2
1
4
3
2
1
4
3
8
7
5
6
2
3
4
1