Yamaha A-S2000 - Amplifier, Руководство по обслуживанию

Страница: 63 / 90

W102
CB52
CB72
CB54
CB75
CB55
IC102
W103
CB21
CB22
W303C
W104
CB24 W317 CB26
W303D
W303B
W303A
W316
W318
W315
W314
W304D
W304B
W304A
IC303 IC301
IC302 IC300
W304C
CB74
CB76
CB73
W204
W203
CB71
IC202
CB84
CB79 CB80
CB77 CB78
CB57 CB58
CB59
CB64
CB60
W202
A
1
2
3
4
5
6
7
8
9
10
B C D E F G H I J K L M N
A-S2000
63
★ All voltages are measured with a 10M Ω /V DC electronic voltmeter.
★
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.
MAIN
AC89.5
AC48.5
DC51.4
DC51.4
AC38.5 AC38.5 AC38.5 AC38.5
DC51.4
DC51.4
58.2 58.2
58.2
58.2
2.9
2.9
3.4
-1.8
2.9
-2.0
60.2
-60.7
58.2
58.2
60.1
60.8
59.4
58.2
0.6
-50.9
0.6
-1.8
60.8
59.4
58.8
0.6
58.2
0.6
0
-50.9
50.9
-51.9
-51.4
-51.9
-52.4
-1.8
-51.2
-1.8
1.8
-52.4
-53.1
-1.8
-1.8
-53.1
-52.5
60.6
-53.3
-53.0
-0.8
-1.7
-0.7
-0.7 -1.0
-1.0
-0.9
60.6
-1.7
-1.7
-1.7
-1.7
-1.7
-50.9
-53.2
60.8
-1.7
0
60.8 60.8
0
0.9 5.1
1.3 -0.7
12.7 -0.7
60.7
1.3
-0.5
50.8
50.3
-1.0
0.5
50.3
6.6
0
6.1
6.1
57.4
6.6
0
6.1
0.6 0.6
0
0
-1.0
-45.0
0.5
-45.5
-45.0
-1.0
-45.5
0
0
-22.1
-20.9
-1.0
-22.1
-39.8
-45.0
-57.3
0
1.1
0
22.0
39.8
21.2
1.1
22.2
0
0.6
61.1
-61.0
32.2
-32.2
24.6
0
4.6
-24.4
24.6
4.4
0
-23.8
-10.8
-15.5
-16.5
-15.6
4.8
4.6
33.6
33.6
-52.7
-53.8
5.1
34.1
-53.9
-52.8
5.1
0
-16.5
-15.6
-24.5 24.9
0
4.4
3.7
-16.5
-15.5
5.1
0
0
4.8
-16.5
-10.8
33.8
5.1
5.1
33.7 5.1
33.7
-52.7
-53.8
5.1
33.8
-53.9
-52.5
39.6
21.2
1.1
1.1
0
0.2
0
-0.1
-1.0
-0.5
-1.0
-45.5
-45.0
-45.0
0.5
-45.6
-45.0
6.1
50.4
6.1
6.6
0
6.0
6.6
57.4
60.8
12.6
-50.9
-51.6
-52.1
60.8
60.8
60.7
0
-1.5
-1.5
-1.5
-51.6
-52.5
-53.1
-1.5
-52.5
-53.1
-1.5
-52.5
-53.1
60.6
-53.1
-53.1
-1.2
-1.5
-1.2 -1.5
-1.2
60.6
-1.5
-53.1
-52.5
-1.5
-53.1
-52.5
-1.5
-53.1
-52.5
-1.5
60.8
58.8
58.8
59.5
60.2
59.8
60.2 58.3
58.3
0.6
0.6 0.6
0.6
58.8
-50.9
-56.7
-59.5
58.3
58.3
58.3
3.6
4.1
3.6
-1.4
-1.6
4.1
-1.4
58.3
58.3
3.6
4.1
-1.6
-1.4
3.6
0
-50.9
-55.7
-1.5
-52.6
-52.1
-1.5
-50.9
58.3
60.2
60.8
60.8
-60.7
-51.6
-1.5
-52.1
-51.6
-53.1
-53.1
-1.5
-53.1 -53.1
-1.5
-1.5
-52.5
-51.0
-0.6
-1.2
-0.6
-1.2
6.6
6.0
0.5
0
0 0.5
-57.2
-20.9
-21.8
-39.8
0
-21.8
-0.1
0.5
0
-0.5
-1.0
22.0
0.6
0
22.0
1.1
50.9
50.4
1.1
34.1
-15.5
-10.8
-15.5
-16.5 -16.5
-15.6
-10.8
-10.8
0
0
-16.5
-15.6
-10.8
-10.8
0
-16.5
-10.8
23.8
0.6
3.2
-23.8
3.7
6.6
0.5
6.1
1.1
0
-51.6
-52.2
-51.6
-52.2
-52.5
-53.1
-52.5
-52.6
-53.1
-53.1
-53.1
-53.5
-53.5
-53.3
-1.8
-52.4
-53.1
-1.8
60.8
60.8
59.8
3.4
3.4
-1.8
1.8
2.9
0
0.9 5.1
Ground point
Ground point
OUT L
IC102, 202 : LM61CIZ
Temperature sensor
MAIN (1)
MAIN (2)
MAIN (3)
MAIN (4)
MAIN (5)
Idling adjustment
Idling adjustment
#
#
# #
#
#
#
#
# #
#
#
Head phone DC offset
Head phone DC offset
Note) Those parts marked with “#” are not included in the P.C.B. ass’y.
（マーク＃の部品は、基板に含まれません。）
to FUNCTION (2)_CB406
P
age 61
J3
to FUNCTION (2)_CB405
P
age 61
J7
to FUNCTION (3)_CB25
Page 62 C6
to FRONT (11)_CB34
Page 66 B3
To POWER TRANSFORMER
T
o
PO
WER
TRANSFORMER
T
o
PO
WER
TRANSFORMER
To POWER TRANSFORMER
to MAIN (3)_W318
M2
to MAIN (2)_CB73
K8
to MAIN (2)_CB72
C9
to MAIN (1)_CB52
C5
to MAIN (2)_CB75
F6
to MAIN (1)_CB55
F1 to MAIN (3)_W314
M2
to MAIN (3)_W315
M2
to FRONT (2)_CB504
Page 64 C9
to FR
ONT (1)_CB521
P
age 64
K8
to FRONT (12)_W101A, W101B
Page 66 H4
to FRONT (13)_W201A, W201B
Page 66 H8
安全対策
・ この製品の内部には高電圧部分があり危険です。修理の際は、絶縁性の手袋を使用するなどの安全対策を行ってください。
・ 下記箇所には電源をOFFにした後も電荷が残り、高電圧が維持されており危険です。
修理作業前に放電用抵抗（5 kΩ/10 W）を下記箇所の端子間に接続して放電してください。放電所用時間は約30秒間です。
1. MAIN （ 3 ） P.C.B. のC308
2. MAIN （ 3 ） P.C.B. のC309
3. MAIN （ 3 ） P.C.B. のC335
4. MAIN （ 3 ） P.C.B. のC336
Safety measures
• Some internal parts in this product contain high voltages and are dangerous. Be sure to take safety measures during servicing, such as wearing insulating gloves.
• Note that positions indicated below are dangerous even after the power is turned off because an electric charge remains and a high voltage continues to exist there.
Before starting any repair work, perform discharge by connecting a discharge resistor (5k-ohms/10W) between terminals at following positions. The time required for
discharging is about 30 seconds.
1. C308 on MAIN (3) P.C.B..
2. C309 on MAIN (3) P.C.B.
.
3. C335 on MAIN (3) P.C.B..
4. C336 on MAIN (3) P.C.B.
.
5 k-ohms
10 W
5 k-ohms
10 W
5 k-ohms
10 W
5 k-ohms
10 W