Yamaha YST-SW015 Service Manual
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YST-SW015
I CONTENTS
To Service Personnel .......................................... 2
Specifications / 参考仕様 ........................................ 2
Internal View ........................................................... 3
Rear Panels .......................................................... 3~4
Disassembly ProcedureS / 分解手順 ............. 5~6
Confirmation OF AUTO STANDBY OPERATION /
AUTO STANDBY動作確認 ............................................. 7
1 0 0 8 3 5

SUBWOOFER SYSTEM

SERVICE 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.
Block Diagram ......................................................... 8
Printed Circuit Board .................................... 9~10
Schematic Diagram .............................................. 11
Parts List ........................................................... 13~19
Parts List For Carbon Resistors ................................ 20
P.O.Box 1, Hamamatsu, Japan

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Summary of Contents for Yamaha YST-SW015

  • Page 1: Subwoofer System

    YST-SW015 SERVICE 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.
  • Page 2: To Service Personnel

    Cherry Color ..............All models Black Color ..............All models Silver Color ..............All models Type / 型式 ....Advanced Yamaha Active Servo Technology Accessories / 付属品 Output Power / 出力 ...... 70 W (100 Hz, 5 Ω, 10% T.H.D.) Subwoofer Cable (3 m) x 1 pc (J model), Input Sensitivity / 入力感度...
  • Page 3: Internal View

    YST-SW015 I INTERNAL VIEW 1 MAIN (8) P.C.B. 2 MAIN (4) P.C.B. 3 MAIN (3) P.C.B. 4 MAIN (1) P.C.B. 5 MAIN (9) P.C.B. (R, T, K models) 6 MAIN (2) P.C.B. 7 MAIN (5) P.C.B. 8 MAIN (7) P.C.B. (U, C, A, B, G, J models) MAIN (10) P.C.B.
  • Page 4 YST-SW015 B, G models R model T model K model J model...
  • Page 5 YST-SW015 I DISASSEMBLY PROCEDURE / 分解手順 (Remove parts in the order as numbered.) (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。 Disconnect the power cable from the AC outlet. 1. スピーカーユニットの外し方 1. Removal of Driver a. Remove 4 screws (1) and then remove the Base. (Fig.
  • Page 6 YST-SW015 3. リアパネルAss'yの外し方 3. Removal of Rear Panel Ass'y a. ④のネジ8本を外します。 (Fig. 3) a. Remove 8 screws (4). (Fig. 3) * Screws (4) are identified with arrow marks ( ※ 取り外す④のネジには矢印 ( ) が印刷されています。 b. Pull out the rear panel ass'y. (Fig. 3) b.
  • Page 7 YST-SW015 I CONFIRMATION OF AUTO STANDBY OPERATION / AUTO STANDBY動作確認 Setting ● 設定 1) Turn off the power switch located on the rear panel. 1) リアパネルにある主電源スイッチをOFFにします。 2) In order to shorten the time required for operation 2) 動作確認時間を短縮するため、MAIN P.C.B. (3) にある...
  • Page 8: Block Diagram

    YST-SW015 I BLOCK DIAGRAM...
  • Page 9 YST-SW015 • Semiconductor Location I PRINTED CIRCUIT BOARD (Foil side) Ref. No. Location MAIN (1) P. C. B. (Lead Type Device) MAIN (2) P. C. B. (Lead Type Device) Power Cable Driver U, C, A, B, G, J models: MAIN (7)
  • Page 10 YST-SW015 • Semiconductor Location • Semiconductor Location I PRINTED CIRCUIT BOARD (Foil side) Ref. No. Location MAIN (4) P. C. B. (Lead Type Device) MAIN (5) P. C. B. MAIN (8) P. C. B. (Lead Type Device) (Lead Type Device)
  • Page 11 YST-SW015 SCHEMATIC DIAGRAM IC1: NJM4558L Dual OP-Amp L.P.F. POWER AMP -14.5 INPUT IC2, 4, 7: µPC4570HA 14.6 Dual OP-Amp TIMER AUTO POWER ON/OFF LIMITER 14.6 14.6 13.9 14.5 Vcc Vo L.P.F. -14.6 IC5: LB8555D Timer PROTECTION DISCHARGE B.A.S.S. THRESHOLD CONTROL VOLTAGE A.N.I.C...
  • Page 12: Parts List

    YST-SW015 PARTS LIST I ELECTRICAL PARTS I WARNING Components having special characteristics are marked s and must be replaced with parts having specifications equal to those originally installed. Carbon resistors (1/6W or 1/4W) are not included in the ELECTRICAL PARTS List. For the parts No. of the carbon resistors, refer to last page.
  • Page 13 YST-SW015 P.C.B. MAIN Schm Ref. PART NO. Description Remarks Markets 部 品 名 Rank WA113100 P.C.B. MAIN PCB MAIN WA113200 P.C.B. MAIN PCB MAIN WA113300 P.C.B. MAIN PCB MAIN WA113400 P.C.B. MAIN PCB MAIN WA113500 P.C.B. MAIN PCB MAIN VB389900 CN.BS.PIN ベースピン VB390200 CN.BS.PIN コネクタベースポスト 01 VB390500 CN.BS.PIN コネクタベースポスト...
  • Page 14 YST-SW015 P.C.B. MAIN Schm Ref. PART NO. Description Remarks Markets 部 品 名 Rank FG644100 C.CE 0.01uF セラコン FG613100 C.CE 1000pF セラコン UR866100 C.EL ケミコン UA654680 C.MYLAR 0.068uF マイラーコン UR838330 C.EL 330uF ケミコン UR848220 C.EL 220uF ケミコン UR837100 C.EL 10uF ケミコン s C49 V6185300 C.CE.SAFTY...
  • Page 15 YST-SW015 P.C.B. MAIN Schm Ref. PART NO. Description Remarks Markets 部 品 名 Rank * s IC8 X3587A00 IC STK404-070 60W パワー IC iG160100 IC NJM78L08A 8V 電源IC VT666100 JACK.PIN ピンジャック iA097030 TR 2SA970 GR,BL トランジスタ iC287820 TR 2SC2878 A,B トランジスタ iC224030 TR 2SC2240 GR,BL トランジスタ...
  • Page 16 YST-SW015 P.C.B. MAIN Schm Ref. PART NO. Description Remarks Markets 部 品 名 Rank WA113000 VR A 5KΩ VOLUME ロータリーVR WA112800 VR SC 10KΩ HIGH CUT ロータリーVR V5995800 PLATE.GND アースプレート V7572400 HOLDER.LED LE56209-0 LEDホルダー ✻ New Parts * 新規部品 (マーク#の部品は、 基板に含まれません)...
  • Page 17 YST-SW015 I EXPLODED VIEW 4-32 4-22 4-11 4-32 4-36 4-32 4-34 4-32 4-32 4-37 4-32 R, T, K models 4-31 4-32 4-35 4-35 4-16 4-1 (1) 4-35 4-33 4-20 4-32 4-21 (7),(10) 4-18 4-19 3-11 *1 3-12 *1 3-3 はSW3とSW4に接着されているため部品...
  • Page 18 YST-SW015 I MECHANICAL PARTS Schm Schm Ref. PART NO. Description Remarks Markets 部 品 名 Rank Ref. PART NO. Description Remarks Markets 部 品 名 Rank WA192600 CABINET ASS'Y キャビネットASSY   ACCESSORIES 付属品 WA192700 CABINET ASS'Y キャビネットASSY   V3262500 SUBWOOFER CABLE 1P 3m サブウーハーケーブル WA192800 CABINET ASS'Y キャビネットASSY  ...
  • Page 19 YST-SW015 Parts List for Carbon Resistors Value 1/4W Type Part No. 1/6W Type Part No. Value 1/4W Type Part No. 1/6W Type Part No. YST-SW015 1.0 Ω 3100 3100 10 kΩ 7100 7100 HJ35 HF85 HF45 HF45 1.8 Ω ❊...

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