Yamaha RX-777, Service Manual

Page: 22 / 32

A
1
2
3
4
5
6
7
8
9
B C D E F G H I J K L
SCHEMATIC DIAGRAM (MAIN)
28
RX-777
2SA1708
2SC4488
E
C
B
1SR139
1SS133
1SS270A
MTZJ16A
MTZJ27D
S5VB20
2SA1694
2SC4467
2SA1358
2SC3421
2SC1740S
2SD1915F
DTA123ESTP
2SA893A
2SA970
2SA1015
2SA1145
2SC1815
2SC1890A
2SC2705
E
C
B
Anode
Cathode
+
–
~
~
E
C B
B
C E
E
C
B
★ All voltage are measured with a 10M
Ω
/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.
MUTING
POWER AMP
PROTECTION
MAIN POWER SUPPLY
SUB POWER SUPPLY
R223
1P 82
D2375 (Q/P)
0
0
-14.6
-14.6
0
0
14.8
15.4
15.4
0
0
-15.4
-15.4
-14.8
15.7
18.5
-6.3
-19.5
18.6
18.6
18.5
-26.7
0
-27.4
~
0.7
0.7
0
0
18.5
0.5
-19.5
-19.5
-0.1
18.6
-19.5
-0.1
18.6
0
18.6
18.5
18.6
-19.5
0
0
15.6 18.6
0
0
56.6
(45.6)
-56.5
(-45.5)
0
AC
30.5
AC
82.4
AC
4.2V
14.0
9.7
0.1
0.1
0
14.0
6.3
0
14.0
6.2
6.3
0 6.2
AC
66.5
AC
12.6
-14.3
0
56.2
0
-14.3
56.6
56.4
0
-0.5
1.1
-0.5
55.4
-0.5
0
56.5
56.5
0.6 1.1
56.0
0.6
56.6
56
55.4
1.1
-1.1
-1.1
-54.9
-55.5
-1.1
-0.5
-56.5
-56.5
-0.6
0
0
0
0
0
0
-55.5
0.6
-55.5
-55.4
0.6
-55.4
0
-55.4
-0.5
56.6
1.1
-1.1
-55.5
-55.4
-56.1
-54.9
-55.5
-56.5
-56.5
-0.5
-56.5
0
0.6
0
56.6
0
56.2
56.6
0
-0.5
1.1
0.6
56.6
0
0.6
0
-0.5
-1.1
55.4
0.6
-55.5
-55.5
-56
56
1.1
55.4
55.4
56
56.6
-1.1
-0.5
-56.5
0
-55.5
-55.5
-56.0
-55.4
-54.9
-55.5
-55.4
-56.0
0
0.6
-55.5
0
0.6
-55.4
-55.5
-55.4
56
56.5
-14.3
-14.3
0
P27
D1
P27 G7
P26
H6
2.2K
2.2K
R224