Yamaha NS-SW300 User manual

P.O.Box 1, Hamamatsu, Japan
SERVICE MANUAL
SUBWOOFER
NS-SW300/NS-SW200
101279
'13.12
■CONTENTS
TO SERVICE PERSONNEL ............................................2
FRONT PANELS .............................................................3
REAR PANELS ...........................................................4–8
SPECIFICATIONS / 参考仕様 ................................... 8–10
INTERNAL VIEW .......................................................... 11
SERVICE PRECAUTIONS / サービス時の注意事項 ..... 12
DISASSEMBLY PROCEDURES / 分解手順 ........... 13–16
BLOCK DIAGRAMS ................................................ 17–18
WIRING DIAGRAMS ..................................................... 19
PRINTED CIRCUIT BOARDS .................................20–27
PIN CONNECTION DIAGRAMS ...................................28
SCHEMATIC DIAGRAMS .......................................29–30
REPLACEMENT PARTS LIST ................................31–45
IMPORTANT NOTICE
This manual has been provided for the use of authorized Yamaha Retailers and their service personnel.
It has been assumed that basic service procedures inherent to the industry, and more specifically Yamaha Products, are already known
and understood by the users, and have therefore not been restated.
WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result in personal injury,
destruction of expensive components, and failure of the product to perform as specified. For these reasons, we advise
all Yamaha product owners that any service required should be performed by an authorized Yamaha Retailer or the
appointed service representative.
IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute authorization, certification or
recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form.
The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, and service
departments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefore, inevitable and specifications
are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributor's
Service Division.
WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body may have
accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss).
IMPORTANT: Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.
Copyright (c) Yamaha Corporation All rights reserved.
This manual is copyrighted by Yamaha and may not be copied or
redistributed either in print or electronically without permission.
NS-SW300/NS-SW200

This product contains chemicals known to the State of California to cause cancer, or birth defects or other reproductive
harm.
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON
WHATSOEVER!
Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or
expose eyes to solder/flux vapor!
If you come in contact with solder or components located inside the enclosure of this product, wash your hands before
handling food.
1. Critical Components Information
Components having special characteristics are marked ⚠and
must be replaced with parts having specifications equal to those
originally installed.
2. Leakage Current Measurement (For 120V Models Only)
When service has been completed, it is imperative to verify
that all exposed conductive surfaces are properly insulated
from supply circuits.
• Meter impedance should be equivalent to 1500 ohms shunted
by 0.15 μF.
■TO SERVICE PERSONNEL
• Leakage current must not exceed 0.5mA.
• Be sure to test for leakage with the AC plug in both polarities.
WARNING: CHEMICAL CONTENT NOTICE!
WALL
OUTLET EQUIPMENT UNDER TEST
AC LEAKAGE
TESTER OR
EQUIVALENT
INSULATING
TABLE
本機に搭載されているすべての基板およびハンダ付けに
よる接合部は無鉛ハンダでハンダ付けされています。
無鉛ハンダにはいくつかの種類がありますが、修理時に
は下記のような無鉛ハンダの使用を推奨します。
󱾁 Sn+Ag+Cu（錫+銀+銅）
󱾁 Sn+Cu（錫 + 銅）
󱾁 Sn+Zn+Bi（錫 + 亜鉛 + ビスマス）
注意：
無鉛ハンダの融点温度は通常の鉛入りハンダに比べ 30 〜
40℃程度高くなっていますので、それぞれのハンダに合っ
たハンダごてをご使用ください。
All of the P.C.B.s installed in this unit and solder joints are
soldered using the lead free solder.
Among some types of lead free solder currently available,
it is recommended to use one of the following types for
the repair work.
• Sn + Ag + Cu (tin + silver + copper)
• Sn + Cu (tin + copper)
• Sn + Zn + Bi (tin + zinc + bismuth)
Caution:
As the melting point temperature of the lead free solder
is about 30°C to 40°C (50°F to 70°F) higher than that of
the lead solder, be sure to use a soldering iron suitable
to each solder.
About lead free solder / 無鉛ハンダについて
For U model
“CAUTION”
NS-SW300 “F1: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME
TYPE 6A, 125V FUSE.”
NS-SW200 “F1: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME
TYPE 3A, 125V FUSE.”
For C model
CAUTION
NS-SW300 F1: REPLACE WITH SAME TYPE 6A, 125V FUSE.
NS-SW200 F1: REPLACE WITH SAME TYPE 3A, 125V FUSE.
ATTENTION
NS-SW300 F1: UTILISER UN FUSIBLE DE RECHANGE DE MÉME TYPE DE 6A, 125V.
NS-SW200 F1: UTILISER UN FUSIBLE DE RECHANGE DE MÉME TYPE DE 3A, 125V.
2
NS-SW300/NS-SW200
NS-SW300/NS-SW200

Front view Side view
Indicator
インジケーター
Front view
Bottom view
Side view
U model
Indicator
インジケーター
■FRONT PANELS
NS-SW300
NS-SW200
3
NS-SW300/NS-SW200
NS-SW300/NS-SW200

■REAR PANELS
U model
R model
T model
K model
NS-SW300
4
NS-SW300/NS-SW200
NS-SW300/NS-SW200

B, G models
A model L, H models
S model
5
NS-SW300/NS-SW200
NS-SW300/NS-SW200

NS-SW200
U model R model
J model
6
NS-SW300/NS-SW200
NS-SW300/NS-SW200

A model
T model B, G models
L, H models
7
NS-SW300/NS-SW200
NS-SW300/NS-SW200

■SPECIFICATIONS /
参考仕様
NS-SW300
S model
J model
Type / 型式
......................... Advanced Yamaha Active Servo Technology II
PWM Digital Drive High Efficient Amplifier
Output Power / 出力 (100 Hz, 5 ohms, 10 % T.H.D.)
......................................................................................... 250 W
Input Sensitivity / 入力感度 (50 Hz, 250 W/5 ohms, L+R)
INPUT (SP) ......................................................................... 1.5 V
INPUT (PJ) ....................................................................... 60 mV
Input Impedance / 入力インピーダンス
INPUT (SP) ................................................................2.2 k-ohms
INPUT (PJ) .................................................................12 k-ohms
Frequency Response / 再生周波数帯域
..........................................................................20 Hz to 160 Hz
Driver / スピーカーユニット
SUBWOOFER ........................... 25 cm (9-7/8") cone woofer x 1
Magnetic shielding type / 防磁型
Input Section / 入力部
INPUT1 ............................................................ Speaker terminal
INPUT2, 3 .............................................................. RCA pin jack
Operation Section / 操作部
Front panel .................................................... STANDBY/ON key
VOLUME control
Indicator (Green, Red)
Rear panel ................................................POWER ON/OFF key
AUTO STANDBY (HIGH / LOW / OFF) switch
PHASE (NORM / REV) switch
B.A.S.S. (MOVIE / MUSIC) switch
HIGH CUT control switch
VOLTAGE SELECTOR switch (R, S models)
Power Supply / 電源
U model ........................................................... AC 120 V, 60 Hz
R, S models ...........................AC 110–120/220–240 V, 50/60 Hz
T model ............................................................ AC 220 V, 50 Hz
K model ............................................................ AC 220 V, 60 Hz
A model ............................................................ AC 240 V, 50 Hz
B, G models ..................................................... AC 230 V, 50 Hz
L, H models ......................................... AC 220–240 V, 50/60 Hz
J model ....................................................... AC 100 V, 50/60 Hz
Power Consumption / 消費電力
U, R, T, K, A, B, G, L, S, H models ..................................... 80 W
J model ............................................................................ 100 W
Standby Power Consumption / 待機消費電力
...............................................................................0.3 W or less
Dimensions / 外形寸法 (W x H x D)
...................... 350 x 366 x 420 mm (13-3/4" x 14-3/8" x 16-1/2")
Weight / 質量
...................................................................... 18.0 kg (39.7 lbs.)
Finish / 仕上げ
B, G models .................................................... WH (White color)
R, T, K, G, L, S, H models .............................. RW (Brown color)
R, T, K, A, B, G, L, S, H, J models .....................BL (Black color)
U, R, T, K, A, B, G, L, S, H models ......... PN (Piano black color)
Accessories / 付属品
System control cable (5 m) ....................................................x 1
Subwoofer cable (5 m) (J model) ..........................................x 1
8
NS-SW300/NS-SW200
NS-SW300/NS-SW200

Type / 型式
......................... Advanced Yamaha Active Servo Technology II
PWM Digital Drive High Efficient Amplifier
Output Power / 出力 (100 Hz, 5 ohms, 10 % T.H.D.)
......................................................................................... 130 W
Input Sensitivity / 入力感度 (50 Hz, 130 W/5 ohms, L+R)
INPUT (SP) ......................................................................... 1.2 V
INPUT (PJ) ....................................................................... 50 mV
Input Impedance / 入力インピーダンス
INPUT (SP) ................................................................2.2 k-ohms
INPUT (PJ) .................................................................12 k-ohms
Frequency Response / 再生周波数帯域
..........................................................................28 Hz to 200 Hz
Driver / スピーカーユニット
.................................................. 20 cm (7-7/8") cone woofer x 1
Magnetic shielding type / 防磁型
Input Section / 入力部
INPUT1 ............................................................ Speaker terminal
INPUT2, 3 .............................................................. RCA pin jack
Operation Section / 操作部
Front panel .................................................... STANDBY/ON key
VOLUME control
Indicator (Green, Red)
Rear panel ................................................POWER ON/OFF key
AUTO STANDBY (HIGH / LOW / OFF) switch
PHASE (NORM / REV) switch
HIGH CUT control switch
VOLTAGE SELECTOR switch (R, S models)
Power Supply / 電源
U model ........................................................... AC 120 V, 60 Hz
R, S models ...........................AC 110–120/220–240 V, 50/60 Hz
T model ............................................................ AC 220 V, 50 Hz
A model ............................................................ AC 240 V, 50 Hz
B, G models ..................................................... AC 230 V, 50 Hz
L, H models ......................................... AC 220–240 V, 50/60 Hz
J model ....................................................... AC 100 V, 50/60 Hz
Power Consumption / 消費電力
U, R, T, A, B, G, L, S, H models ......................................... 67 W
J model .............................................................................. 55 W
Standby Power Consumption / 待機消費電力
...............................................................................0.3 W or less
Dimensions / 外形寸法 (W x H x D)
............................ 290 x 306 x 351 mm (11-3/8" x 12" x 13-7/8")
Weight / 質量
...................................................................... 11.2 kg (24.7 lbs.)
Finish / 仕上げ
B, G, S models ................................................ WH (White color)
R, T, G, L, S, H models ................................... RW (Brown color)
R, T, A, B, G, L, S, H, J models .........................BL (Black color)
U, R, T, A, B, G, L, H models ................. PN (Piano black color)
Accessories / 付属品
System control cable (5 m) ....................................................x 1
Subwoofer cable (5 m) (J model) ..........................................x 1
NS-SW200
*Specifications are subject to change without notice due to
product improvements.
※ 参考仕様および外観は予告なく変更されることがあります。
U .......................U.S.A. model
R ....................General model
T .................... Chinese model
K ..................... Korean model
A ................Australian model
B ......................British model
G .................European model
L .................Singapore model
S .................. Brazilian model
H ..........................Thai model
J .................. Japanese model
9
NS-SW300/NS-SW200
NS-SW300/NS-SW200

Front view Side view
Front view
Bottom view
Bottom view
Side view
350 (13-3/4")
265 (10-3/8")
420 (16-1/2")
350 (13-3/4")
290 (11-3/8")
16
(5/8")
45
(1-3/4")
45 (1-3/4")
45
(1-3/4")
45 (1-3/4")
44
(1-3/4")
26
(1")
351 (13-7/8")
290 (11-3/8")
35
(1-3/8")
26
(1")
40
(1-5/8")
45
(1-3/4")
40
(1-5/8")
45
(1-3/4")
366 (14-3/8")
260 (10-1/4")
250 (9-7/8")
207 (8-1/8")
350 (13-3/4")
16
(5/8") 306 (12")
290 (11-3/8")
ø 60
205 (8-1/8")
200 (7-7/8")
ø 60
•DIMENSIONS /
寸法図 NS-SW300
NS-SW200
Unit: mm (inch)
単位：mm（インチ）
Unit: mm (inch)
単位：mm（インチ）
10
NS-SW300/NS-SW200
NS-SW300/NS-SW200

■INTERNAL VIEW
MAIN (4) P.C.B.
MAIN (3) P.C.B.
MAIN (6) P.C.B.
MAIN (1) P.C.B.
MAIN (8) P.C.B.
POWER TRANSFORMER
MAIN (9) P.C.B. (U, T, K, A, B, G, L, H, J models)
MAIN (10) P.C.B. (R, S models)
MAIN (5) P.C.B.
MAIN (11) P.C.B. (R, S models)
MAIN (2) P.C.B.
MAIN (4) P.C.B.
MAIN (3) P.C.B.
MAIN (8) P.C.B.
MAIN (1) P.C.B.
MAIN (6) P.C.B.
POWER TRANSFORMER
MAIN (7) P.C.B. (U, T, A, B, G, L, H, J models)
MAIN (9) P.C.B. (R, S models)
MAIN (5) P.C.B.
MAIN (10) P.C.B. (R, S models)
MAIN (2) P.C.B.
Rear view
Front view Front view
Rear view
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
2
3
11
2
3
4
4
10 9 6 587 10 9 6 587
NS-SW300 NS-SW200
11
NS-SW300/NS-SW200
NS-SW300/NS-SW200

■SERVICE PRECAUTIONS / サービス時の注意事項
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（1）P.C.B. の C85、C86
詳しくは “PRINTEDCIRCUITBOARDS” を参照してくだ
さい。
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 and C86 on MAIN (1) P.C.B.
For details, refer to “PRINTED CIRCUIT BOARDS”.
12
NS-SW300/NS-SW200
NS-SW300/NS-SW200

Front grille assembly
フロントグリル Ass'y
Cabinet assembly
キャビネット Ass'y Bottom side
底面
Metalblade
ヘラ
MAIN (4) P.C.B.
CB1
Flatblade screwdriver
マイナスドライバー
Rubber sheet and cloth
ゴムシートと布
to CB1
■DISASSEMBLY PROCEDURES / 分解手順
Fig. 1
NS-SW300 NS-SW200
Disassembly procedures of the NS-SW300 and NS-
SW200 are almost the same. For that reason, we
explain disassembly procedure of the NS-SW300 as a
representative here.
1. Removal of Front Grille Assembly
a. Spread a rubber sheet and cloth for protection of this
unit against any damage and place this unit on cloth
with its bottom side facing up. (Fig. 1)
*The front grille assembly is fixed to the cabinet
assembly with dowels at 11 locations.
As a flatblade screwdriver is used for removal, use
special care not to cause damage to the cabinet
assembly.
b. First, insert a flatblade screwdriver at 3 dowel positions
and push up the front grille assembly. (Fig. 1)
c. Next, using the metalblade or the like, push the front
grille assembly upward until it comes off. (Fig. 1)
d. Remove CB1. (Fig. 1)
e. Remove the front grille assembly. (Fig. 1)
Notes:
• Removing the front grille assembly with the flatblade
screwdriver only without using the metalblade or the
like may cause damage to the front grille assembly.
• When installing the front grille assembly, apply quick-
drying bond or the like to dowels and then fit them
into dowel holes for secure installation. (The front
grille assembly will come off easily if its dowels are
fitted into dowel holes without applying quick-drying
bond or the like.)
(Remove parts in the order as numbered.)
Disconnect the power cable from the AC outlet.
NS-SW300 と NS-SW200 の分解手順はほぼ同じです。そ
のため、ここでは代表として NS-SW300 の分解手順で説
明します。
1. フロントグリル Ass'y の外し方
a. 本機に傷などが付かないようにゴムシートと布を敷
き、本機を底面が上になるように置きます。（Fig.1)
※ フロントグリル Ass'y は 11 箇所のダボでキャビ
ネット Ass'y に固定されています。
取り外しの際、キャビネット Ass'y に傷が付かない
よう十分注意してください。
b. 最初にマイナスドライバーを 3 箇所のダボ位置へ差し
込み、フロントグリル Ass'y を押し上げます。（Fig.1）
c. 次にヘラ等を使い、フロントグリル Ass'y が外れるま
で徐々に上面ヘ押し上げていきます。（Fig.1）
d. CB1 を外します。（Fig.1）
e. フロントグリル Ass'y を外します。（Fig.1）
注意：
・ フロントグリル Ass'y を外す際、ヘラ等を使わずマイ
ナスドライバーだけを使って外すと、フロントグリル
Ass'y が破損する場合があります。
・ フロントグリル Ass'y を取り付ける場合、フロントグ
リル Ass'y のダボに速乾ボンドなどを塗って取り付け
ます。（ダボへ速乾ボンドなどを塗らずに差し込んだ
場合、フロントグリル Ass'y は容易に外れてしまいま
す。）
( 番号順に部品を取り外してください。)
AC 電源コンセントから、電源コードを抜いてください。
13
NS-SW300/NS-SW200
NS-SW300/NS-SW200

Fig. 2
2. Removal of Front Panel
a. Remove the VOLUME knob and POWER knob. (Fig. 2)
b. Remove 6 screws (①). (Fig. 2)
c. Remove the front panel together with the MAIN (4)
P.C.B. (Fig. 2)
3. Removal of Driver
a. Remove 4 screws (②) and then pull out the driver.
(Fig. 2)
b. Disconnect the connector connected to the terminal
of the driver. (Fig. 2)
c. Remove the driver. (Fig. 2)
2. フロントパネルの外し方
a. VOLUME つまみと POWER つまみを外します。（Fig.2）
b. ①のネジ 6 本を外します。（Fig.2)
c. フロントパネルと MAIN（4）P.C.B. を一緒に外します。
（Fig.2）
3. スピーカーユニットの外し方
a. ②のネジ 4 本を外し、スピーカーユニットを引き出し
ます。（Fig.2)
b. スピーカーユニットの端子に接続されているコネク
ターを外します。（Fig.2)
c. スピーカーユニットを外します。（Fig.2）
Driver
スピーカーユニット
Rubber sheet and cloth
ゴムシートと布
Cabinet assembly
キャビネット Ass'y Bottom side
底面
Connectors
コネクター
②
②
Front grille assembly
フロントグリル Ass'y
Front panel
フロントパネル
VOLUME knob
VOLUME つまみ
POWER knob
POWER つまみ
MAIN (4) P.C.B.
CB1
①
①
14
NS-SW300/NS-SW200
NS-SW300/NS-SW200

Rear panel assembly
リヤパネル Ass'y
Rubber sheet and cloth
ゴムシートと布
Cover assembly
カバー Ass'y
MAIN (1) P.C.B.
W1
CB6
to CB6
to CB1
to DRIVER
③
③
④
④
*The old bushing, once removed, cannot be reused
as it may cause air leakage.
Be sure to install a new one for its replacement.
※外した古いブッシュは、空気漏れの原因となる
恐れがあるため、再利用できません。
新しいものに交換してください。
Bushing (Front panel side)
ブッシュ（フロントパネル 側 ）
Bushing (Cover assembly side)
ブッシュ（カバー Ass'y 側）
Fig. 3
4. Removal of Rear Panel Assembly
a. Remove the bushing (Font panel side). (Fig. 3)
b. Remove 8 screws (③). (Fig. 3)
*Screws (③) are identified with arrow marks ( )
c. Pull out the rear panel assembly. (Fig. 3)
d. Remove 2 screws (④). (Fig. 3)
*Screws (④) are identified with arrow marks ( )
e. Remove the bushing (cover assembly side). (Fig. 3)
f. Remove the cover assembly. (Fig. 3)
g. Remove CB6. (Fig. 3)
h. Remove the rear panel assembly. (Fig. 3)
4. リアパネル Ass'y の外し方
a. ブッシュ（フロントパネル側）を外します。（Fig.3)
b. ③のネジ 8 本を外します。（Fig.3)
※ 取り外す③のネジには矢印（ ）が印刷されてい
ます。
c. リアパネル Ass'y を引き出します。（Fig.3）
d. ④のネジ 2 本を外します。（Fig.3)
※ 取り外す④のネジには矢印（ ）が印刷されてい
ます。
e. ブッシュ（カバー Ass'y 側）を外します。（Fig.3)
f. カバー Ass'y を外します。（Fig.3）
g. CB6 を外します。（Fig.3）
h. リアパネル Ass'y を外します。（Fig.3）
15
NS-SW300/NS-SW200
NS-SW300/NS-SW200

P.C.B. をチェックする場合には：
・ ゴムシートと布を敷き、その上に本機を置いてチェッ
クします。（Fig.4）
・ 外したケーブル（コネクター）をすべて接続します。
When checking the P.C.B.:
• Spread the rubber sheet and cloth. Then place this
unit on the cloth and check it. (Fig. 4)
• Reconnect all cables (connectors) that have been
disconnected.
Rear panel assembly
リヤパネル Ass'y
Rubber sheet and cloth
ゴムシートと布
*The old bushing, once removed, cannot be reused
as it may cause air leakage.
Be sure to install a new one for its replacement.
※外した古いブッシュは、空気漏れの原因となる
恐れがあるため、再利用できません。
新しいものに交換してください。
Fig. 4
16
NS-SW300/NS-SW200
NS-SW300/NS-SW200

RY1
T1
VR2
INPUT 1
+
+
-
-
L
R
+
+
-
-
L
R
OUTPUT
INPUT 2
L/
MONO
R
IC9B
INPUT 3
LFE
2
36
5-
+
1IC6A
L.P.F
12dB/oct
HIGH CUT
VR1
IC7B
+
-
-
+-
+
6
5
7
+
-
IC9A
IC6B
IC7A
+
-IC8A
77 5
6
2
3
17
5
6
SW1
PHASE
AUTO STANDBY
NORM
REV
Timer
IC1
OFF
LOW
HIGH
7
4
6
8
3
SW2
OFF
LOW
HIGH
+
AUTO STANDBY CIRCUIT
B.A.S.S
Q43C,Q45A
PS Amplifier
Q43A,Q45C
PS Amplifier
+B
-B
R180
0.1
Power Drive
Q33A,Q33C
Pre Drive
Q25-Q32
+
-
DRIVER
SUBWOOFER
A.N.I.C
Limitter
Q11,12,14,15
-
+
IC10A
1
IC2
IC3
Regulator
Regulator Regulator
SW5
RY2F1
+12
-12
D10
Power
Supply
Sub-Power
Supply
Power
Supply
C51
+
C52
C61 ++
+
C62
+B
-B
+
+
C85
C86
D21
D6
D7
RY2
IC4
(R, S models)
(U, T, K, A, B, G, L, H, J models)
D14
3
2
-
+
SW3
IC10B
6
7
8
MOVIE
MUSIC
IC8B
+
-
H.P.F
12dB/oct
7
5
6
-
+1
3
2
Protection Protection
Q17,19,22,24
Protection
Q6,8,9,13
STATUS
Indicator
D1
RGControl
Q2,4
SYSTEM
CONNECTOR
DCIN
AC IN
Power
transformer
Sub-
transformer
Music
Sensor
IC5
POWER
ON/OFF
STANDBY/ON
SW6
MAIN • See page 29 →
SCHEMATIC DIAGRAM
ABCDEFGH I J
1
2
3
4
5
6
7
NS-SW300/NS-SW200
17
■BLOCK DIAGRAMS
NS-SW300

RY1
T1
INPUT 1
+
+
-
-
L
R
+
+
-
-
L
R
OUTPUT
INPUT 2
L/
MONO
R
IC9B
INPUT 3
LFE
-
+
IC6B
L.P.F
12dB/oct
HIGH CUT
VR1
IC7B
+
-
-
++
-
IC9A
IC6A
IC7A
+
-7
5
6
2
3
17
5
6
SW1
PHASE
Timer
IC1
OFF
LOW
HIGH
7
4
6
8
3
AUTO STANDBY
SW2
OFF
LOW
HIGH
Music
Sensor
IC5
+
AUTO STANDBY CIRCUIT
Q43C,Q45A
PS Amplifier
Q43A,Q45C
PS Amplifier
+B
-B
R180
0.1
Power Drive
Q33A,Q33C
Pre Drive
Q25-Q32
+
-
DRIVER
SUBWOOFER
A.N.I.C
Limitter
Q11,12,14,15
Q51
Q52
Regulator
Regulator Regulator
SW5
RY2F1
+15
-15
D21
Power
Supply
Sub-Power
Supply
+
C61 ++
+
C62
RY2
STANDBY/ON
SW6
IC4
(R, S models)
(U, T, A, B, G, L, H, J models)
D14
Protection Protection
Q17,19
STATUS
Indicator
D1
RGControl
Q2,4
SYSTEM
CONNECTOR
DCIN
AC IN
Power
transformer
Sub-
transformer
Q40,42
Q22,24
Q16,18,20,21
C85
C86
D41
2
3
1
T2
7+
-
7
5
6
3
2
1
2
3
-
+1
VR1
VOLUME
6
57
-
+
H.P.F
12dB/oct
IC8A
NORM
REV
IC8B
POWER
ON/OFF
MAIN • See page 30 →
SCHEMATIC DIAGRAM
ABCDEFGH I J
1
2
3
4
5
6
7
18
NS-SW300/NS-SW200
NS-SW200

Cord Stopper Cord Stopper
Power cable Power cable
100 mm
(3-7/8") 120 mm
(4-3/4")
W5
CB5
W7B1
W7B2
W7B3
W8B1
W8B2
W8B3
CB4
W3W1
CB3
W4
PN1
CB6 W7A1
W8A1
W1
W3
W8A2
W8A3
R, S models
R, S models
R, S models
W7A2
W7A3
MAIN (6)
MAIN (2) MAIN (2)
MAIN (11)
MAIN (5)
MAIN (10)MAIN (9)
MAIN (8)
MAIN (5)
MAIN (7)MAIN (9)
MAIN (6)
MAIN (1)
MAIN (3)
MAIN (3)
MAIN (8)
MAIN (1)
MAIN (2)
MAIN (2)
MAIN (10)
CB5
CB4
W2 W5
W4
W1
CB6
CB2
CB3
Side viewRear view
Side viewRear view
POWER
TRANSFORMER POWER
TRANSFORMER
to MAIN (4)
(CB1)
to MAIN (4)
(CB1)
to DRIVER
to DRIVER
U, T, A, B, G, L, H, J models
R, S modelsU, T, K, A, B, G, L, H, J models
ABCDEFGH I J
1
2
3
4
5
6
7
NS-SW300/NS-SW200
19
■WIRING DIAGRAMS
•OVERALL ASSEMBLY
NS-SW200NS-SW300

W4
CB6
W7A1
W7A2
W7A3
W5
IC4
W12A
W9A
W10A
W11A
W1
W3
JK1
MAIN (1) (Side A)
MAIN (3) (Side A)
MAIN (2) (Side A)
WH
RE
BE
GY
WH
OR
DRIVER
SUBWOOFER
SP+
SP-
NF
MAIN (6)
(CB4)
MAIN (5)
(W9B, W10B)
MAIN (9) (W11B, W12B)
(U, T, K, A, B, G, L, H, J models)
MAIN (10) (W11B, W12B)
(R, S models)
+12 -12 SP SIG2 SPRYON OCDET SGND E2 LIMT
5 k-ohms
10 W
5 k-ohms
10 W
MAIN (8)
(W7B1, W7B2, W7B3)
RE
RE
BL
AC IN
SUB-
TRANSFORMER
MAIN (6)
(CB5)
MAIN (6)
(CB3)
MAIN (4)
(CB1)
SW
+5V
+12D
-12D
SIG
SGND
VOL ASE
LEDR
LEDG
E2
ACRYON
+5V
+12
-12
ASE
ACRYON
+5V
SIG1
BASW
SGND
SYSTEM
CONNECTOR
AUTO
STANDBY
OFFLOWHIGH
B.A.S.S.
MUSICMOVIEREVNORM
PHASE HIGH CUT
140Hz40Hz
INPUT1 / OUTPUT
FROM AMPLIFIER/
TO SPEAKERS
INPUT2 /
NORMAL INPUT3 /
LFE
L / MONO / R
+--+
RL
T, K, B, G, L, H models
T, K, B, G, L, H models
U, T, K, A, B, G, L, H, J models
R, S models
ABCDEFGH I J
1
2
3
4
5
6
7
20
NS-SW300/NS-SW200
■PRINTED CIRCUIT BOARDS
• Semiconductor Location
NS-SW300
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
（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
Ref no. Location
D14 D5
D21 B3
D31 D3
D32 D3
D33 D3
D34 E3
D35 E3
D36 D3
D37 D3
D38 D3
D39 D3
D40 D3
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