Yamaha A-S3000, Service Manual

Page: 58 / 101

CB305
IC302
IC304
IC303
W312
W306
W314
W308
CB308
CB301
CB306
CB302
CB304
W311
W306
IC301
W313
W307
MAIN (3)
(Side A)
HPGND HPGND HPGND
MAIN (2)
(W208)
FRONT (16)
(W415, W416)
FRONT (15)
(W413, W114)
MAIN (2)
(W201)
FUNCTION (2)
(W52)
FUNCTION (1)
(W501)
FUNCTION (2)
(W51)
MAIN (2)
(+B3, -B3, +B4, -B4)
-27V
AGND
+27V
PRV
AGND
POWER TRANSFORMER
POWER TRANSFORMER
POWER TRANSFORMER
POWER TRANSFORMER
PSVA2
PSVA1
+5S
PRV
MG
5 k-ohms
10 W
5 k-ohms
10 W
5 k-ohms
10 W
5 k-ohms
10 W
MAIN (1)
(W101)
AGND
-PB
AGND
+PB
AGND
-PB
+PB
AGND
Capacitor
Capacitor
WH
RE
BL
RE
BL
RE
RE
WH
WH
BE
GR
RE
WH
BE
GR
RE
BL
RE
BL
RE
MAIN (1)
(+B1, -B1, +B2, -B2)
A B C D E F G H I J
1
2
3
4
5
6
7
58
A-S3000
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 the capacitors 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, connect a discharging resistor (5 k-ohms/10 W) to the terminals
of each capacitor indicated below to discharge electricity. The time required for discharging is about 30 seconds per each.
C317–C320 on MAIN (3) P.C.B.
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。
・ 下記のコンデンサには電源を 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 k Ω /10 W）を下記の各コンデンサの端子間に接続して放電してください。放電所用時間は各々約 30 秒間です。
MAIN（3）P.C.B. の C317~C320
Ref no. Location
D301 H4
D302 H5
D303 G4
D304 G4
D305 E3
D306 F3
• Semiconductor Location
Ref no. Location
D307 G5
D308 G5
D303 G4
D304 G4
D305 E3
D306 F3
Ref no. Location
D307 G5
D308 G5
D319 G5
D330 D5
D331 D5
D332 D4
Ref no. Location
D333 D4
D334 C4
D335 C5
IC301 G4
IC302 G5
IC303 D4
Ref no. Location
IC304 D5
Q304 F5