Printed Circuit Boards - Yamaha NS-SW300 Service Manual

A B
NS-SW300/NS-SW200

■ PRINTED CIRCUIT BOARDS

1
MAIN (1)
(Side A)
2
RE W7A1
BL
W7A2
3
RE W7A3
MAIN (8)
(W7B1, W7B2, W7B3)
4
5 k-ohms
5 k-ohms
10 W
10 W
MAIN (2)
(Side A)
5
R, S models
U, T, K, A, B, G, L, H, J models
MAIN (6)
6
(CB5)
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.
C85, C86 on MAIN (1) 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
7
（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（1）P.C.B. の C85、C86
20
C D E
T, K, B, G, L, H models
SUB-
TRANSFORMER
GY
W9A
OR
W10A
WH
W11A
W5
F G
NS-SW300
MAIN (6)
(CB4)
W4
WH
SP-
NF
RE
SP+
T, K, B, G, L, H models
MAIN (9)
(W11B, W12B)
(U, T, K, A, B, G, L, H, J models)
MAIN (10) • Semiconductor Location
(W11B, W12B)
(R, S models)
Ref no. Location
D14 D5
D21 B3
D31 D3
D32 D3
BE
D33 D3
W12A
D34 E3
D35 E3
D36 D3
MAIN (5)
(W9B, W10B)
D37 D3
D38 D3
D39 D3
D40 D3
AC IN
IC4 C6
Q30 E2
Q31 D2
Q32 E2
Q33A F4
Q33C C4
Q35A C3
Q35C E2
Q40 E4
Q42 F3
Q43A E4
Q43C C4
Q45A D4
Q45C E4
Q50 B2
H I
MAIN (3)
(Side A)
W1
DRIVER
SUBWOOFER
J
MAIN (4)
(CB1)
ACRYON
+5V
ASE
-12
+12
BASW
SGND
SIG1
MAIN (6)
(CB3)