Yamaha FSW150 - YST Subwoofer - 75 Watt User manual

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.
YST-FSW150/
YST-FSW050
■CONTENTS
TO SERVICE PERSONNEL .......................................... 2
SPECIFICATIONS / 参考仕様 ........................................ 3
INTERNAL VIEW ........................................................... 4
FRONT PANELS ............................................................ 5
REAR PANELS .......................................................... 6–7
DISASSEMBLY PROCEDURES/分解手順 ........... 8–11
BLOCK DIAGRAM ....................................................... 12
PRINTED CIRCUIT BOARDS ................................ 13–14
SCHEMATIC DIAGRAMS ...................................... 15–16
REPLACEMENT PARTS LIST .............................. 17–25
101061
SERVICE MANUAL
SUBWOOFER SYSTEM
YST-FSW150/YST-FSW050
2007 All rights reserved.
This manual is copyrighted by YAMAHA and may not be copied or
redistributed either in print or electronically without permission.
P.O.Box 1, Hamamatsu, Japan
'07.08
• YST-FSW150
• YST-FSW050

YST-FSW150/YST-FSW050
2
YST-FSW150/
YST-FSW050
WALL
OUTLET EQUIPMENT UNDER TEST
AC LEAKAGE
TESTER OR
EQUIVALENT
INSULATING
TABLE
WARNING: CHEMICAL CONTENT NOTICE!
The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or plastic (where
applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency (and
possibly other entities) to cause cancer and/or birth defects or other reproductive harm.
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REA-
SON 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 s
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 0.15µF.
●Leakage current must not exceed 0.5mA.
●Be sure to test for leakage with the AC plug in both polarities.
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
■TO SERVICE PERSONNEL
For U model
“CAUTION”
“F1: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 1.6A,
125V FUSE.”
For C model
CAUTION
F1: REPLACE WITH SAME TYPE 1.6A, 125V FUSE.
ATTENTION
F1: UTILISER UN FUSIBLE DE RECHANGE DE MÉME TYPE DE 1.6A, 125V.

YST-FSW150/YST-FSW050
3
435 (17-1/8")
151 (5-15/16")
130 (5-1/8")21
(13/16")
350 (13-3/4") 7
(1/4")
3
(1/8") 360 (14-3/16")
(5-15/16")
151
437 (17-3/16")
(14-11/16")
373
Stand
縦置き用スタンド
When installing the unit vertically
（本機を縦置きにする場合）
163 (6-7/16")
142 (5-9/16")21
(13/16")
(13-3/4")
350
350 (13-3/4") 7
(1/4")
3
(1/8") 360 (14-3/16")
(6-7/16")
163
352 (13-7/8")
When installing the unit vertically
（本機を縦置きにする場合）
(14-3/16")
360
Type / 型式 ....... Advanced Yamaha Active Servo Technology II
Output Power / 出力 (100 Hz, 5 ohms, 10% T.H.D.)
[YST-FSW150] .................................................................. 75 W
[YST-FSW050] .................................................................. 50 W
Dynamic Power / ダイナミックパワー (5 ohms)
[YST-FSW150] ................................................................ 130 W
[YST-FSW050] ................................................................ 100 W
Input Sensitivity / 入力感度 (50 Hz, 75 W / 5 ohms, INPUT (PJ))
[YST-FSW150] .............................................................. 100 mV
[YST-FSW050] ................................................................ 50 mV
Input Impedance / 入力インピーダンス
INPUT (PJ) ................................................................ 12 k-ohms
Frequency Response / 再生周波数帯域
[YST-FSW150] .................................................30 Hz to 160 Hz
[YST-FSW050] .................................................35 Hz to 160 Hz
Driver / スピーカーユニット (Magnetic shielding type)
........................................................... 16 cm (6.5") cone woofer
Input Section / 入力部
INPUT .................................................................... RCA pin jack
Operation Section / 操作部
Front panel ..... Power switch, Volume control, Power indicator
Bottom panel ............................. Vo ltage selector (R, L models)
Power Supply / 電源
U, C models .................................................... AC 120 V, 60 Hz
R, L 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
J model ....................................................... AC 100 V, 50/60 Hz
Power Consumption / 消費電力
[YST-FSW150]
U, C, R, T, A, B, G, L models ......................................... 70 W
J model ........................................................................... 45 W
[YST-FSW050]
U, C, R, T, K, A, B, G, L models .................................... 40 W
J model ........................................................................... 25 W
Dimensions / 外形寸法 (W x H x D)
[YST-FSW150] .......................................... 435 x 151 x 360 mm
(17-1/8" x 5-15/16" x 14-3/16")
[YST-FSW050] .......................................... 350 x 163 x 360 mm
(13-3/4" x 6-7/16" x 14-3/16")
Weight / 質量
[YST-FSW150] ........................................9.4 kg (20 lbs. 12 oz.)
[YST-FSW050] ........................................8.5 kg (18 lbs. 12 oz.)
Finish
[YST-FSW150]
Black Color ........................... U, C, R, T, A, B, G, L, J models
Silver Color ........................... U, C, R, T, A, B, G, L, J models
[YST-FSW050]
Black Color ...................... U, C, R, T, K, A, B, G, L, J models
Silver Color ...................... U, C, R, T, K, A, B, G, L, J models
Accessories / 付属品
Subwoofer cable (5 m) x 1, System control cable (5 m) x 1,
Stand (with PAD x 2) x 1 (YST-FSW150 model),
Screw x 2 (YST-FSW150 model), Nonskid pad x 4
* 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。
• DIMENSIONS / 寸法図
Advanced Yamaha Active Servo Tech-
nology II
Advanced Yamaha Active Servo Technol-
ogy is a unique system to let the speaker
unit have a perfectly linear motion by the
speaker and amplifier combination.
アドバンスドヤマハアクティブサーボテクノロ
ジーII
アドバンスドヤマハアクティブサーボテクノロ
ジーは、スピーカーとアンプの組み合わせによ
り振動板を効率よくスムーズに動かし最大音圧
時のリニアリティを大幅に改善したユニークな
システムです。
■SPECIFICATIONS / 参考仕様
U .......... U.S.A. model
C .......... Canadian model
R .......... General model
T .......... Chinese model
K .......... Korean model
A .......... Australian model
B .......... British model
G .......... European model
L .......... Singapore model
J ........... Japanese model
YST-FSW150
YST-FSW050
Unit: mm (inch)
単位：mm（インチ）
Unit: mm (inch)
単位：mm（インチ）

YST-FSW150/YST-FSW050
4
1
2
3
4
5
6
7
8
Power Transformer
MAIN (7) P.C.B. (U, C, T, A, B, G, J models)
MAIN (8) P.C.B. (R, L models)
MAIN (4) P.C.B.
MAIN (6) P.C.B. (R, L models)
Driver Woofer
MAIN (1) P.C.B.
MAIN (2) P.C.B.
MAIN (3) P.C.B.
6 7
8
1 2 3 54
■INTERNAL VIEW
YST-FSW150 YST-FSW050
1
2
3
4
5
6
7
8
Power Transformer
MAIN (7) P.C.B. (U, C, T, K, A, B, G, J models)
MAIN (8) P.C.B. (R, L models)
MAIN (6) P.C.B. (R, L models)
Driver Woofer
MAIN (4) P.C.B.
MAIN (1) P.C.B.
MAIN (2) P.C.B.
MAIN (3) P.C.B.
6 7
8
4 51 32

YST-FSW150/YST-FSW050
5
YST-FSW150/
YST-FSW050
Power indicator
Power indicator
■FRONT PANELS
R, L models
U, C, J models
R, L models
U, C, J models
YST-FSW150
YST-FSW050
• Front view
• Bottom view
• Front view
• Bottom view

YST-FSW150/YST-FSW050
8
YST-FSW150/
YST-FSW050
■DISASSEMBLY PROCEDURES / 分解手順
Fig. 1
Disconnect the power cable from the AC outlet.
• Required tools
• Flatblade screwdriver
• Metalblade or the like (with wider blade end)
* Used when removing the bottom grille ass’y and
front panel ass’y.
1. Removal of driver
a. Turn the main unit bottom up.
* The bottom grille ass’y is fixed to the cabinet ass’y
with dowels at 4 locations. As a flatblade screwdriver
is used for removal, use special care not to cause
damage to the cabinet ass’y.
b. First, insert a flatblade screwdriver at 4 dowel positions
and push up the bottom grille ass’y. (Fig. 1)
c. Next, using the metalblade or the like, push the bottom
grille ass’y upward until it comes off. (Fig. 1)
Note: • Removing the bottom grille ass’y with the
flatblade screwdriver only without using the
metalblade or the like may cause damage to
the bottom grille ass’y.
• When installing the bottom grille ass’y, apply
quick-drying bond or the like to dowels and
then fit them into dowel holes for secure instal-
lation. (The bottom grille ass’y will come off
easily if its dowels are fitted into dowel holes
without applying quick-drying bond or the like.)
AC電源コンセントから、電源コードを抜いてください。
・ 必要なツール
・ マイナスドライバー
・ヘラ等（先端の幅が広いもの）
※ ボトムグリルASSYおよびフロントパネルASSYを取り
外す時に使用します。
1. スピーカーユニットの外し方
a. 本機を上下反転します。
* ボトムグリルASSYは4箇所のダボでキャビネットASSY
に固定されています。取り外しの際、キャビネットASSY
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4箇所のダボ位置へ差し込み、ボ
トムグリルASSYを押し上げます。（Fig.1）
c. 次にヘラ等を使い、徐々に上面ヘ押し上げて、ボトムグリル
ASSYを取り外します。（Fig.1）
注意： ・ ボトムグリルASSYを取り外す際、ヘラ等を使わず
マイナスドライバーだけを使って取り外すと、ボト
ムグリルASSYが破損する場合があります。
・ ボトムグリルASSYを取り付ける場合、ボトムグリ
ルASSYのダボに速乾ボンドなどを塗って取り付け
ます。（ボトムグリルASSYのダボへ速乾ボンドな
どを塗らずに差し込むだけでは、簡単に外れてしま
います。）
Metalblade
ヘラ
Dowel
ダボ
Dowel
ダボ
Bottom grille ass'y
ボトムグリルASSY
Flatblade screwdriver
マイナスドライバー
Dowel
ダボ

YST-FSW150/YST-FSW050
9
YST-FSW150/
YST-FSW050
2. Removal of bottom panel ass’y
a. Remove 2 screws (2) and then remove 2 legs. (Fig. 3)
b. Remove 12 screws (3). (Fig. 3)
* Screws (3) are identified with arrow marks ( ).
c. Pull out the bottom panel ass’y. (Fig. 3)
d. Remove CB1-5 and then remove the bottom panel
ass’y. (Fig. 3)
2. ボトムパネルASSYの外し方
a. 2のネジ2本を外し、レッグ2個を取り外します。（Fig.3）
b. 3のネジ12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. ボトムパネルASSYを引き出します。（Fig.3）
d. CB1〜CB5を外し、ボトムパネルASSYを取り外します。
（Fig.3）
Fig. 3
Fig. 2
Driver
スピーカーユニット
Connector
コネクター
1
Leg
レッグ
Leg
レッグ
Bottom panel ass'y
ボトムパネルASSY
2
2
3
3
CB1
CB2
CB3
CB4
CB5
MAIN (1) P.C.B. MAIN (2) P.C.B.
d. 1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）
e. 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）
d. Remove 4 screws (1) and then pull out the driver. (Fig. 2)
e. Disconnect the connector connected to the terminal of
the Driver. (Fig. 2)

YST-FSW150/YST-FSW050
10
YST-FSW150/
YST-FSW050
3. フロントパネルASSYの外し方
* フロントパネルASSYはダボでキャビネットASSYに固定さ
れています。取り外しの際、キャビネットASSYに傷が付かな
いよう十分注意してください。
a. ブッシュ2個を外します。（Fig.4）
※ 一度外した古いブッシュは使用できません。古いブッシュ
を外した場合、新しいブッシュに交換してください。
b. 最初にマイナスドライバーを2箇所のダボ位置へ差し込み、フ
ロントパネルASSYを押し上げます。（Fig.4）
c. 次にヘラ等を使い、徐々に上面ヘ押し上げて、フロントパネル
ASSYを取り外します。（Fig.4）
注意： ・ フロントパネルASSYを取り外す際、ヘラ等を使わ
ずマイナスドライバーだけを使って取り外すと、フ
ロントパネルASSYが破損する場合があります。
・ フロントパネルASSYを取り付ける場合、フロント
パネルASSYのダボに速乾ボンドなどを塗って取り
付けます。（フロントパネルASSYのダボへ速乾ボ
ンドなどを塗らずに差し込むだけでは、簡単に外れ
てしまいます。）
3. Removal of front panel ass’y
* The front panel ass’y is fixed to the cabinet ass’y with
dowels. As a flatblade screwdriver is used for removal,
use special care not to cause damage to the cabinet
ass’y.
a. Remove 2 bushings. (Fig. 4)
* Used bushing, once removed, cannot be reused. Be
sure to use a new bushing in place of the removed
used bushing.
b. First, insert a flatblade screwdriver at 2 dowel positions
and push up the front panel ass’y. (Fig. 4)
c. Next, using the metalblade or the like, push the front
panel ass’y upward until it comes off. (Fig. 4)
Note: •Removing the front panel ass’y with the
flatblade screwdriver only without using the
metalblade or the like may cause a damage to
the front panel ass’y.
•When installing the front panel ass’y, apply
quick-drying bond or the like to dowels and
then fit them into dowel holes for secure instal-
lation. (The front panel ass’y will come off eas-
ily if its dowels are fitted into dowel holes with-
out applying quick-drying bond or the like.)
Fig. 4
Bushing
ブッシュ
Front panel ass'y
フロントパネルASSY
Metalblade
ヘラ
Flatblade screwdriver
マイナスドライバー
Dowel
ダボ
Dowel
ダボ
YST-FSW150
Bushing
ブッシュ
Front panel ass'y
フロントパネルASSY
Metalblade
ヘラ
Flatblade screwdriver
マイナスドライバー
Dowel
ダボ
YST-FSW050
Dowel
ダボ

YST-FSW150/YST-FSW050
11
YST-FSW150/
YST-FSW050
Fig. 5
4. リアパネルASSYの外し方
a. 4のネジ8本を外します。（Fig.5）
※ 取り外す4のネジには矢印（ ）が印刷されています。
b. リアパネルASSYを取り外します。（Fig.5）
c. ブッシュ2個を外します。（Fig.5）
※ 一度外した古いブッシュは使用できません。古いブッシュ
を外した場合、新しいブッシュに交換してください。
d. 5のネジ4本を外し、リアカバーを取り外します。（Fig.5）
4. Removal of rear panel ass’y
a. Remove 8 screws (4). (Fig. 5)
* Screws (4) are identified with arrow marks ( ).
b. Remove the rear panel ass’y. (Fig. 5)
c. Remove 2 bushings. (Fig. 5)
* Used bushing, once removed, cannot be reused. Be
sure to use a new bushing in place of the removed
used bushing.
d. Remove 4 screws (5) and then remove the rear cover.
(Fig. 5)
Rear panel ass'y
リアパネルASSY
Rear cover
リアカバー
Bushing
ブッシュ
4
4
5
When Checking the P.C.B.:
•Connect all the connectors removed during disassem-
bly back to the original positions.
•Spread the rubber sheet and cloth for insulation pur-
pose and place the bottom panel ass’y, front panel
ass’y and rear panel ass’y on them. (Fig. 6)
P.C.B.チェックをする場合には
・ 分解の際に外したコネクターをすべて元通りに接続します。
・ 絶縁のためにゴムシートと布を敷き、その上にボトムパネル
ASSY、フロントパネルASSY、リアパネルASSYを置いて
チェックします。（Fig.6）
Fig. 6
Rubber sheet and cloth
ゴムシートと布
Rear panel ass'y
リアパネルASSY
Front panel ass'y
フロントパネルASSY
Bottom panel ass'y
ボトムパネルASSY

YST-FSW150/YST-FSW050
12
YST-FSW150/
YST-FSW050
■BLOCK DIAGRAM
IC3
7
5
6-
---
+
+
-
L.P.F.
6dB/oct H.P.F.
12dB/oct
DRIVER
WOOFER
INPUT
PJ1
VR1
VOLUME
POWER
AMP.
RY1
PROTECTION
3
2
10
9
12
+B
-
+
-B
IC2
Q5,6,7,8
Q2,4,9,12
R59
0.1
POWER
SUPPLY
D20
D1
AC5
F1 T1
POWER
POWER
INDICATOR
SW1
+B
-B
+15
-15
IC4
IC5
REGULATOR
A.N.IC
LIMITER
+
+
Q10,11 RY2
JK1
SYSTEM CONTROL
1
3
2
S1
+10
S2
IC1A
IC6B
IC1B
DRIVER
S3
S0
S4
57
L.P.F.
12dB/oct
+
IC6A
31
AC IN
YST-FSW150/YST-FSW050

ABCDE FGH I J
1
2
3
4
5
6
7
YST-FSW150/YST-FSW050
13
W2
IC1
W3A
W3B
CB3 CB9
CB1
CB8
CB2
IC6
IC5
CB7 CB6
W6A
IC4
W7A
CB5
JK1
W1
W12A CB11 CB12
W14A
W11A
W13A
W7BW6B
W10B3 W10B2 W10B1
W6BW14BW13B
W12BW7B
W11B
W10B1
W10B2
W10B3
IC3
CB4
IC2
W10A3 W10A2 W10A1
W9 W8
G3
C56
C53
C8
G4
L2
MAIN (3) P.C.B. (Side A)
MAIN (1) P.C.B. (Side A)
MAIN (2) P.C.B. (Side A) MAIN (4) P.C.B. (Side A) (Side A)
MAIN (6) P.C.B. (Side A)
MAIN (7) P.C.B.
(Side A)
U, C, T, A, B, G, J models
R, L modelsR, L models
MAIN (8) P.C.B.
VOLUME
POWER
OFF/SYSTEM ON Power indicator
INPUT
SYSTEM
CONNECTOR
VO LTAGE
SELECTOR
220-240V110-120V
1
8
WH
BE
YE
BR
BR
BE
BE
RE
YE
WH
BE
RE
BE WH
AC2
BE
WH
AC1
LED LEDG -15 +15 S2 E S3
S1 +10 E
S4
E
SO
PRT
E3
R1A R1B
+15
-15
S4 E SO PRT E3 R1A R1B +15 -15 AC5 -B 15G +B
AC5
-B
15G
+B
S1 +10 E
AC IN
BE
SP+
SP-
WH
S3
S2
+15
-15
LEDG
LED
E
DRIVER
WOOFER
COM
COM
IN
OUT
IN
OUT
18
112
18
B, G models
B, G models
B, G models
U, C, R, T, A, L, J models
B, G models
■PRINTED CIRCUIT BOARDS
YST-FSW150
• Semiconductor Location
D1 D2
D3 C5
D4 C6
D5 D7
D6 B7
D7 C4
D8 C5
D9 C5
D10 B7
D11 C4
D12 C7
D13 C5
D14 B6
D15 C7
D16 C7
D17 B6
D18 G2
D19 H3
D20 F2
Ref no. Location Ref no. Location
IC1 C3
IC2 G3
IC3 G1
IC4 C5
IC5 C5
IC6 D6
Q2 C7
Q4 C6
Q5 D6
Q6 C6
Q7 C7
Q8 C7
Q9 C7
Q10 B7
Q11 C6
Q12 C7
Q13 H1
Q14 I1

2
ABCDEFGH I J
1
3
4
5
7
YST-FSW150/YST-FSW050
6
14
W2
IC1
W3A
W3B
CB3 CB9
CB1
CB8
CB2
IC6
IC5
CB7 CB6
W6A
IC4
W7A
CB5
JK1
W1
W12A CB11 CB12
W14A
W11A
W13A
W7B
W6B
W10B3 W10B2 W10B1
W6B W14B W13B W12B W7B W11B
W10B1
W10B2W10B3
IC3
CB4
IC2
W10A3 W10A2 W10A1
W9 W8
G3
C56
C53
C8
G4
L2
MAIN (3) P.C.B. (Side A)
MAIN (1) P.C.B. (Side A)
MAIN (2) P.C.B. (Side A) MAIN (4) P.C.B. (Side A)
(Side A)
(Side A)
MAIN (6) P.C.B. (Side A)
MAIN (7) P.C.B.
U, C, T, K, A, B, G, J models
R, L modelsR, L models
MAIN (8) P.C.B.
VOLUME
POWER
INPUT
SYSTEM
CONNECTOR
1
8
WH
BE
YE
BR
YE
WH
BE
RE
BR
BE
RE
BE WH
AC2
BE
WH
AC1
LED LEDG -15 +15 S2 E S3
S1 +10 E
S4
E
SO
PRT
E3
R1A R1B
+15
-15
S4 E SO PRT E3 R1A R1B +15 -15 AC5 -B 15G +B
AC5
-B
15G
+B
S1 +10 E
AC IN
BE
SP+
SP-
WH
BE
S3
S2
+15
-15
LEDG
LED
E
DRIVER
WOOFER
COM
COM
IN
OUT
IN
OUT
18
112
18
OFF/SYSTEM ON
K, B, G models
K, B, G models
K, B, G models
K, B, G models
VO LTAGE
SELECTOR
220-240V110-120V
U, C, R, T, A, L, J models
Power indicator
YST-FSW050
•Semiconductor Location
D1 D2
D3 C5
D4 C6
D5 D7
D6 B7
D7 C4
D8 C5
D10 B7
D11 C4
D12 C7
D14 B6
D15 C7
D16 C7
D17 B6
D18 H2
D19 I3
D20 F2
IC1 C3
Ref no. Location Ref no. Location
IC2 H3
IC3 G1
IC4 C5
IC5 C5
IC6 D6
Q2 C7
Q4 C6
Q5 D6
Q6 D6
Q7 C7
Q8 C7
Q9 C7
Q10 B7
Q11 C6
Q12 C7
Q13 H1
Q14 I1

JK1
IC1
IC1
W2
W1
W3B
W3A
CB3
CB2
CB1
IC6
IC6
IC4
IC2
IC2
IC3
CB4
W8
W9
W10A3
W10A2
W10A1
CB8
CB9
IC5
CB6
CB5
W6A
W10B3
W10B2
W10B1
W10B3
W6A
W6B
W14B
W13B
W12B
W7B
W11B
W14A
W13A
CB11 CB12
W12A
W11A
W7A
W10B2
W10B1
W7A
CB7
W6B
W7B
A
1
2
3
4
5
6
7
8
9
10
BCDEFGH I J K LMN
YST-FSW150/YST-FSW050
15
★All voltages are measured with a 10MΩ/V DC electronic voltmeter.
★Components having special characteristics are marked sand must be replaced
with parts having specifications equal to those originally installed.
★Schematic diagram is subject to change without notice.
SCHEMATIC DIAGRAMS
MAIN
YST-FSW150
0
-4.9
0
0
+14.8
0
0
0
-15.2
0
0
0
+14.8
0
0
0
0
0
0
0
0
0
0
0
0
+14.8
0
0
00
0
-15.2
0
0
0
0
-12.6 +14.8
+31.2
-15.2
-36.8
-31.5
-31.5 -37.1 -42.6
+1.4
+1.4
+0.9
00
0
+1.4
+1.4
+0.8
0
+0.2
+0.8
0
0 -0.5 -0.2 +14.8
+14.2
0
+14.2
0
-11.2
+31.2 +36.8 +42.4
0
-15.2
-6.8
-15.2
+14.8
0
0
0
0
0.2 0.2
-42.1
+14.8
+1.2
-42.6
-1.1
+1.8
+42.4
0 0
0
0
+42.4
+42.4
+42.4
-11.2
+24.6
0
+42.4-42.6
AC 62.4V
V723510
JG-11-T
FG64410
0.01/50
FG65122
22P
s16
s17
L2
J502 O O O
O
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
IC5:NJM79M15FA
Voltage regulator
COMMON
OUTPUT
INPUT
INPUT
OUTPUT
COMMON
IC4: NJM78M15FA
Voltage regulator
IC1, 2, 6: NJM4558L
Dual operational amplifier
87654321
OUT1
–Vcc
+IN2
–IN2
OUT2
+Vcc
+IN1
–IN1
IC3: STK404-120
Power amplifier
SUB
PT1
TR3
C1
C2
R2
R1
TR1 TR2
TR6
TR7
TR8
TR5
TR4 D1 R3 R6
R5
R4
811 12
1254 6 7 9 10
3
NJM79M15FA
1: OUT
2: IN
3: COM
NJM78M15FA
1: OUT
2: COM
3: IN
NJM4558L
1
8
STK404-120
1
12
1SR139
Anode
Cathode
1SR400
1SS133
Anode
Cathode
1SS176
D3SBA20 4A 200V
1234
MTZJ5.6B
MTZJ12C
MTZJ24B
ECB
2SA970 2SA1015-Y
1233: Base
2: Collector
1: Emitter
2SC1815
ECBECB
2SC2240
2SC2878
MAIN (3)
MAIN (4)
MAIN (2)
MAIN (1)
MAIN (7)
MAIN (8)
MAIN (6)
AC IN
POWER
TRANSFORMER
POWER
TRANSFORMER
INPUT
SYSTEM
CONNECTOR
VO LTAG E
SELECTOR
PROTECTION
DRIVER
DRIVER
WOOFER
POWER
SUPPLY
(R, L models) (U, C, T, A, B, G, J models)
L.P.F.
L.P.F.
H.P.F.
LIMITER
REGULATOR
A.N.IC
POWER AMP.
4.7K
s17
s16
4.7K
–
+

JK1
IC1
IC1
W2
W1
W3B
W3A
CB3
CB2
CB1
IC6
IC6
IC4
IC2
IC2
IC3
CB4
W8
W9
W10A3
W10A2
W10A1
CB8
CB9
IC5
CB6
CB5
W6A
W10B3
W10B2
W10B1
W10B3
W6A
W6B
W14B
W13B
W12B
W7B
W11B
W14A
W13A
CB11 CB12
W12A
W11A
W7A
W10B2
W10B1
W7A
CB7
W6B
W7B
A
1
2
3
4
5
6
7
8
9
10
BCDEFGH I J K LMN
YST-FSW150/YST-FSW050
16
★All voltages are measured with a 10MΩ/V DC electronic voltmeter.
★Components having special characteristics are marked sand must be replaced
with parts having specifications equal to those originally installed.
★Schematic diagram is subject to change without notice.
MAIN
YST-FSW050
AC 51.2V
0
0
+15.0
0
0
0
-15.1
0
0
0
0
+15.0
0
0
0
-15.1
0
0
+15.0
0
0
-15.1
0
0
+12.6
-15.1
-29.6
+15.0
+29.3 +34.8
-34.9 -34.9
0
0
0
0
0
00
00
0
+28.9
-34.5
0
-7.1
00
+1.3
+1.3
+0.7
+0.7
+0.8
+1.3 +1.3
0
00
0
000
0
0
00
0
+15.0
+14.4
+14.4
0
0
+34.7
-34.8
+23.9
0
0
-15.1 0
0
0
+15.1
0
0
0
+34.7
+34.7
+34.7
0
0
+0.2 +0.2
0
+1.8
-34.3
+15.0
+1.2
+1.2
-34.8
+34.7
0 0
V723510
JG-11-T
FG64410
0.01/50
FG65122
22P
s16
s17
L2
J502 O O O
O
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
IC5:NJM79M15FA
Voltage regulator
COMMON
OUTPUT
INPUT
INPUT
OUTPUT
COMMON
IC4: NJM78M15FA
Voltage regulator
IC1, 2, 6: NJM4558L
Dual operational amplifier
87654321
OUT1
–Vcc
+IN2
–IN2
OUT2
+Vcc
+IN1
–IN1
IC3: STK404-120
Power amplifier
SUB
PT1
TR3
C1
C2
R2
R1
TR1 TR2
TR6
TR7
TR8
TR5
TR4 D1 R3 R6
R5
R4
811 12
1254 6 7 9 10
3
NJM79M15FA
1: OUT
2: IN
3: COM
NJM78M15FA
1: OUT
2: COM
3: IN
NJM4558L
1
8
STK404-120
1
12
1SR139
Anode
Cathode
1SR400
1SS133
Anode
Cathode
1SS176
D3SBA20 4A 200V
1234
MTZJ5.6B
MTZJ12C
MTZJ24B
ECB
2SA970 2SA1015-Y
1233: Base
2: Collector
1: Emitter
2SC1815
ECBECB
2SC2240
2SC2878
MAIN (3)
MAIN (4)
MAIN (2)
MAIN (1)
MAIN (7)
MAIN (8)
MAIN (6)
AC IN
POWER
TRANSFORMER
POWER
TRANSFORMER
INPUT
SYSTEM
CONNECTOR
VO LTAG E
SELECTOR
PROTECTION
DRIVER
DRIVER
WOOFER
POWER
SUPPLY
(R, L models) (U, C, T, K, A, B, G, J models)
L.P.F.
H.P.F.
LIMITER
REGULATOR
A.N.IC
POWER AMP.
L.P.F.
3.3K
s17
s16
3.3K
–
+

17
YST-FSW150/YST-FSW050
YST-FSW150/
YST-FSW050
■REPLACEMENT PARTS LIST
ABBREVIATIONS IN THIS LIST ARE AS FOLLOWS:
C.A.EL.CHP : CHIP ALUMI.ELECTROLYTIC CAP
C.CE : CERAMIC CAP
C.CE.ARRAY : CERAMIC CAP ARRAY
C.CE.CHP : CHIP CERAMIC CAP
C.CE.ML : MULTILAYER CERAMIC CAP
C.CE.M.CHP : CHIP MULTILAYER CERAMIC CAP
C.CE.SAFTY : RECOGNIZED CERAMIC CAP
C.CE.TUBLR : CERAMIC TUBULAR CAP
C.CE.SMI : SEMI CONDUCTIVE CERAMIC CAP
C.EL : ELECTROLYTIC CAP
C.MICA : MICA CAP
C.ML.FLM : MULTILAYER FILM CAP
C.MP : METALLIZED PAPER CAP
C.MYLAR : MYLAR FILM CAP
C.MYLAR.ML : MULTILAYER MYLAR FILM CAP
C.PAPER : PAPER CAPACITOR
C.PLS : POLYSTYRENE FILM CAP
C.POL : POLYESTER FILM CAP
C.POLY : POLYETHYLENE FILM CAP
C.PP : POLYPROPYLENE FILM CAP
C.TNTL : TANTALUM CAP
C.TNTL.CHP : CHIP TANTALUM CAP
C.TRIM : TRIMMER CAP
CN : CONNECTOR
CN.BS.PIN : CONNECTOR,BASE PIN
CN.CANNON : CONNECTOR,CANNON
CN.DIN : CONNECTOR,DIN
CN.FLAT : CONNECTOR,FLAT CABLE
CN.POST : CONNECTOR,BASE POST
COIL.MX.AM : COIL,AM MIX
COIL.AT.FM : COIL,FM ANTENNA
COIL.DT.FM : COIL,FM DETECT
COIL.MX.FM : COIL,FM MIX
COIL,OUTPT : OUTPUT COIL
DIOD.ARRAY : DIODE ARRAY
DIODE.BRG : DIODE BRIDGE
DIODE.CHP : CHIP DIODE
DIODE.VAR : VARACTOR DIODE
DIOD.Z.CHP : CHIP ZENER DIODE
DIODE.ZENR : ZENER DIODE
DSCR.CE : CERAMIC DISCRIMINATOR
FER.BEAD : FERRITE BEADS
FER.CORE : FERRITE CORE
FET.CHP : CHIP FET
FL.DSPLY : FLUORESCENT DISPLAY
FLTR.CE : CERAMIC FILTER
FLTR.COMB : COMB FILTER MODULE
FLTR.LC.RF : LC FILTER,EMI
GND.MTL : GROUND PLATE
GND.TERM : GROUND TERMINAL
HOLDER.FUS : FUSE HOLDER
IC.PRTCT : IC PROTECTOR
JUMPER.CN : JUMPER CONNECTOR
JUMPER.TST : JUMPER,TEST POINT
L.DTCT : LIGHT DETECTING MODULE
L.EMIT : LIGHT EMITTING MODULE
LED.DSPLY : LED DISPLAY
LED.INFRD : LED,INFRARED
MODUL.RF : MODULATOR,RF
PHOT.CPL : PHOTO COUPLER
PHOT.INTR : PHOTO INTERRUPTER
PHOT.RFLCT : PHOTO REFLECTOR
PIN.TEST : PIN,TEST POINT
PLST.RIVET : PLASTIC RIVET
R.ARRAY : RESISTOR ARRAY
R.CAR. : CARBON RESISTOR
R.CAR.CHP : CHIP RESISTOR
R.CAR.FP : FLAME PROOF CARBON RESISTOR
R.FUS : FUSABLE RESISTOR
R.MTL.CHP : CHIP METAL FILM RESISTOR
R.MTL.FLM : METAL FILM RESISTOR
R.MTL.OXD : METAL OXIDE FILM RESISTOR
R.MTL.PLAT : METAL PLATE RESISTOR
RSNR.CE : CERAMIC RESONATOR
RSNR.CRYS : CRYSTAL RESONATOR
R.TW.CEM : TWIN CEMENT FIXED RESISTOR
R.CEMENT : CEMENT RESISTOR
SCR.BND.HD : BIND HEAD B-TIGHT SCREW
SCR.BW.HD : BW HEAD TAPPING SCREW
SCR.CUP : CUP TIGHT SCREW
SCR.TERM : SCREW TERMINAL
SCR.TR : SCREW,TRANSISTOR
SUPRT.PCB : SUPPORT,P.C.B.
SURG.PRTCT : SURGE PROTECTOR
SW.TACT : TACT SWITCH
SW.LEAF : LEAF SWITCH
SW.LEVER : LEVER SWITCH
SW.MICRO : MICRO SWITCH
SW.PUSH : PUSH SWITCH
SW.RT.ENC : ROTARY ENCODER
SW.RT.MTR : ROTARY SWITCH WITH MOTOR
SW.RT : ROTARY SWITCH
SW.SLIDE : SLIDE SWITCH
TERM.SP : SPEAKER TERMINAL
TERM.WRAP : WRAPPING TERMINAL
THRMST.CHP : CHIP THERMISTOR
TR.CHP : CHIP TRANSISTOR
TR.DGT : DIGITAL TRANSISTOR
TR.DGT.CHP : CHIP DIGITAL TRANSISTOR
TRANS : TRANSFORMER
TRANS.PULS : PULSE TRANSFORMER
TRANS.PWR : POWER TRANSFORMER ASS’Y
TUNER.AM : TUNER PACK,AM
TUNER.FM : TUNER PACK,FM
TUNER.PK : FRONT-ENDTUNER PACK
VR : ROTARY POTENTIOMETER
VR.MTR : POTENTIOMETER WITH MOTOR
VR.SW : POTENTIOMETER WITH ROTARY SW
VR.SLIDE : SLIDE POTENTIOMETER
VR.TRIM : TRIMMER POTENTIOMETER
• ELECTRICAL COMPONENT PARTS
WARNING
●Components having special characteristics are marked sand must be replaced with parts having specifications
equal to those originally installed.
●s印のある部分は、安全確保部品を示しています。部品の交換が必要な場合、パーツリストに記載されている部品を使用してください。
● 部品価格ランクは、予告なく変更することがあります。

18
YST-FSW150/YST-FSW050
YST-FSW150/
YST-FSW050
RefNo. PartNo. Description Remarks Markets 部 品 名 ランク
P.C.B. MAIN
✻New Parts＊新規部品
YST-FSW150
      
      
      
      
      
      
s      
      
s      
      
      
      
       
      
      
      
      
     
       
      
      
s      
      
      
      
      
      
      
      
      
      
      
      
      
       
      
      
      
      
      
     
      
      
      
     
      
      
s      
       
       
      
      
      
      
      

19
YST-FSW150/YST-FSW050
YST-FSW150/
YST-FSW050
RefNo. PartNo. Description Remarks Markets 部 品 名 ランク
P.C.B. MAIN
✻New Parts＊新規部品
YST-FSW150
      
      
      
      
      
      
      
      
      
      
s      
s      
s       
s       
    
     
      
      
s      
      
      
      
      
      
     
      
      
      
      
      
      
      
      
      
      
s      
      
s      
      
      
      
      
      
      
      
     
      
     
s      
s      
s     
s       
      

20
YST-FSW150/YST-FSW050
YST-FSW150/
YST-FSW050
RefNo. PartNo. Description Remarks Markets 部 品 名 ランク
P.C.B. MAIN
✻New Parts＊新規部品
YST-FSW050
      
      
      
      
      
      
s      
      
s      
      
      
      
       
      
      
      
      
     
       
      
      
s      
      
      
      
      
      
      
      
      
      
      
      
      
       
      
      
      
      
      
     
      
      
      
     
      
      
s      
       
       
      
      
      
      
      