Yamaha NS-SW300 Service Manual page 24

A B
NS-SW300/NS-SW200
1
MAIN (1)
(Side A)
T, B, G, L, H models
2
3
RE
SP+
DRIVER
NF
SUBWOOFER
WH
SP-
4
MAIN (2)
(Side A)
• Semiconductor Location
Ref no. Location Ref no. Location
D14 D5 Q33A C2
Q33C E2
D21 F3
5
D31 E3 Q35A E3
D32 E3 Q35C D3
U, T, A, B, G, L, H, J models
D33 E3 Q40 D2
D34 D3 Q42 D2
D35 D3 Q43A C2
D36 D3 Q43C E2
D37 D2 Q45A E2
D40 D2 Q45C D2
Q50 F3
IC4 C5
Q30 C3 Q51 I5
Q31 D3 Q52 I5
6
Q32 C3
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
24
C D
W4
T, B, G, L, H models
SUB-
TRANSFORMER
R, S models
W5
E F G
NS-SW200
5 k-ohms
10 W
RE
W2
W7A3
BL
W7A2
RE
W7A1
MAIN (6)
(W7B1, W7B2, W7B3)
5 k-ohms
10 W
MAIN (7)
(W11B, W12B)
(U, T, A, B, G, L, H, J models)
MAIN (9)
(W11B, W12B)
(R, S models)
BE
W12A
GY
W9A
MAIN (5)
(W9B, W10B)
OR
W10A
AC IN
WH
W11A
H I
MAIN (3)
(Side A)
VOL
SGND
SIG
-15D
+15D
+5V
SW
ASE
LEDG
LEDR
MAIN (4)
W3
T, B, G, L, H models
U, R, A, S, J models
CB5
CB2
J
(CB1)
MAIN (8)
(CB3)
U, R, A, S, J models
T, B, G, L, H models