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Yamaha YST-SW325 Service Manual
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Yamaha YST-SW325 Service Manual

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See also: Owner's Manual
YST-SW325
FRONT VIEW
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.
I CONTENTS
TO SERVICE PERSONNEL .......................................... 2
SPECIFICATIONS / 参考仕様 ........................................ 3
INTERNAL VIEW ........................................................... 4
REAR PANELS .......................................................... 4~5
ADJUSTMENTS / 調整 .............................................. 8~9
1 0 0 9 6 1

SUBWOOFER SYSTEM

SERVICE MANUAL
TOP VIEW
IMPORTANT NOTICE
BLOCK DIAGRAM ....................................................... 10
PRINTED CIRCUIT BOARD .................................. 11~12
SCHEMATIC DIAGRAM .............................................. 13
PARTS LIST ........................................................... 15~22
2005
All rights reserved.
P.O.Box 1, Hamamatsu, Japan
'05.07

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Summary of Contents for Yamaha YST-SW325

  • Page 1: Table Of Contents

    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.

  • Page 2: To Service Personnel

    YST-SW325 I TO SERVICE PERSONNEL AC LEAKAGE WALL EQUIPMENT TESTER OR OUTLET UNDER TEST EQUIVALENT 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)

  • Page 3: Rear Panels

    YST-SW325 I SPECIFICATIONS / 参考仕様 • DIMENSIONS / 寸法図 Type / 型式 ..Advanced Yamaha Active Servo Technology II Output Power / 出力 (100 Hz, 5 ohms, 10% T.H.D.) ... 150 W 374.4 (14-3/4") Dynamic Power / ダイナミックパワー (5 ohms) ... 170 W 315 (12-7/16")
  • Page 4 YST-SW325 I INTERNAL VIEW MAIN (8) P.C.B. Front Side Rear Side Driver MAIN (3) P.C.B. MAIN (4) P.C.B. MAIN (2) P.C.B. MAIN (1) P.C.B. MAIN (10) P.C.B. Power Transformer MAIN (6) P.C.B. MAIN (7) P.C.B. MAIN (9) P.C.B. (R, L models) MAIN (5) P.C.B.
  • Page 5 YST-SW325 T model K model A model B, G models L model J model...

  • Page 6: Disassembly Procedures / 分解手順

    YST-SW325 I DISASSEMBLY PROCEDURES / 分解手順 （番号順に部品を取り外してください。） (Remove parts in the order as numbered.) Disconnect the power cable from the AC outlet. AC電源コンセントから、電源コードを抜いてください。 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. a. ①のネジ4本を外し、ベースを取り外します。 （Fig. 1）...
  • Page 7 YST-SW325 MAIN (8) P.C.B. Rear Panel Ass'y リアパネル ASSY MAIN (3) P.C.B. Rear Cover リアカバー Control Unit コントロールユニット Fig. 2 When Checking the P.C.B.: P.C.B.チェックをする場合には ・ リアパネルASSYとコントロールユニットを組み立 • Assemble Rear Panel Ass'y and Control Unit. • Connect all the connectors removed during dis- てます。...
  • Page 8 YST-SW325 I ADJUSTMENTS / 調整 G Confirmation of Power Amp operation ●パワーアンプの動作の確認 パワーアンプを修理した場合、下記の手順に従って、回路 For the power amplifier which has been repaired, it is absolutely necessary to confirm that a correct 図に示してあるA点とB点で正しい波形が得られることを必 ず確認してください。 waveform is obtained at points indicated by A and B in the schematic diagram according to the following procedure.
  • Page 9 YST-SW325 G Confirmation of AUTO STANDBY operation ●オートスタンバイ動作確認 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 （2） P.C.B.にある check; connect a 10kΩ resistor at both ends of R72 on R72の両端に10 kΩの抵抗を取り付けます。...

  • Page 10: Block Diagram

    YST-SW325 I BLOCK DIAGRAM HIGH CUT FILTER B.A.S.S. PASS PASS MOVIE MOVIE VOLUME PHASE DRIVER POWER IC1A SELECT PS AMP Q24C, 32 MUSIC MUSIC IC1B IC2A NORM IC3B – – IC4A IC4B IC3A – – – INPUT 1 – –...

  • Page 11: Printed Circuit Board

    YST-SW325 I PRINTED CIRCUIT BOARD (Foil side) Lead Free Solder Used MAIN (3) P. C. B. HIGH CUT VOLUME STANDBY/ON B.A.S.S. HIGH CUT FILTER MAIN (8) P. C. B. MOVIE PASS MUSIC POWER INDICATOR MAIN (1) P. C. B. MAIN (2)
  • Page 12 YST-SW325 • Semiconductor Location Ref. no. Location Ref. no. Location Ref. no. Location Ref. no. Location Ref. no. Location I PRINTED CIRCUIT BOARD (Foil side) Lead Free Solder Used Circuit No. U, C, J R, L T, K, B, G...

  • Page 13: Schematic Diagram

    YST-SW325 SCHEMATIC DIAGRAM POWER AMP L.P.F. VOLUME HIGH CUT +14.5 +14.5 62.8 PS AMP 63.0 63.3 63.0 63.0 62.8 62.4 62.8 HIGH CUT -5.7 FILTER L.P.F. DRIVER H.P.F. H.P.F. -14.4 -14.3 +14.5 -14.3 -2.1 -2.1 LIMITER -5.6 PHASE -14.1 14.1 -4.7...

  • Page 14: Parts List

    YST-SW325 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. ●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。...
  • Page 15 YST-SW325 P.C.B. MAIN Ref. No Part No. Description Remarks Markets 部 品 名 Rank WF610500 P.C.B. MAIN ＰＣＢ メイン     WF610600 P.C.B. MAIN ＰＣＢ メイン     WF610700 P.C.B. MAIN ＰＣＢ メイン     WF610800 P.C.B. MAIN ＰＣＢ メイン     WF610900 P.C.B. MAIN ＰＣＢ メイン     WF611000 P.C.B. MAIN ＰＣＢ メイン     VB390100 CN.BS.PIN ベースピン VB858200 CN.BS.PIN...
  • Page 16 YST-SW325 P.C.B. MAIN Ref. No Part No. Description Remarks Markets 部 品 名 Rank UR867220 C.EL 22uF ケミコン         01 UR867220 C.EL 22uF ケミコン         01 UA654100 C.MYLAR 0.01uF 50V J マイラーコン       01 UA654680 C.MYLAR 0.068uF 50V J マイラーコン       02 C53-54 UR867220 C.EL 22uF ケミコン        ...
  • Page 17 YST-SW325 P.C.B. MAIN Ref. No Part No. Description Remarks Markets 部 品 名 Rank IC3-4 XM922A00 NJM4558L ＩＣ IC5-6 XB247A00 uPC4570HA-A ＩＣ X2020A00 LB8555D アンプＩＣ ＳＩＬ    04 X4472A00 NJM78L08A-T3 電源ＩＣ         * s IC9 X6832A00 STK404-140S アンプＩＣ        V6415800 JACK.PIN ピンジャック     WB543700 WB54370 L=70 #18 スタイルピン      ...
  • Page 18 YST-SW325 P.C.B. MAIN Ref. No Part No. Description Remarks Markets 部 品 名 Rank s SW5 V8377400 SW.POWER SY16-52-4 パワースィッチ s SW6 WC906700 SW.SLIDE SDKPA40300 スライドＳＷ       06 VY858600 SW.PUSH SPUP19145A プッシュＳＷ       04 s T1 X4335A00 TRANS サブトランス       05 * s T1 X4336A00 TRANS サブトランス      ...
  • Page 19 YST-SW325 I EXPLODED VIEW 4-2-1 4-2-4 4-2-3 4-32 4-11 4-35 4-35 4-2-6 4-1-14 4-32 (10) 4-1-1 4-1-13 4-32 4-1-11 4-32 4-1-14 4-1-1 4-2-6 4-37 4-1-1 4-31 4-1-8 4-1-11 4-1-1 4-19 4-16 4-1-1 4-1-11 4-23 4-1-1 3-11 4-32 4-1-1 4-1-1 4-21...
  • Page 20 YST-SW325 I MECHANICAL PARTS Ref. Ref. Part No. Description Remarks Markets 部 品 名 Rank Part No. Description Remarks Markets 部 品 名 Rank WF601200 CABINET ASS'Y キャビネットＡＳＳＹ 4-35 VT669300 PW HEAD B-TIGHT SCREW 3x8-8 MFC2 ＰＷヘッドＢタイトネジ WF601300 CABINET ASS'Y キャビネットＡＳＳＹ 4-37 VA847600 BIND HEAD P-TIGHT SCREW 4x12 MFZN2BL バインドＰタイトネジ...
  • Page 21 YST-SW325 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. 1.0 Ω 3100 3100 10 kΩ 7100 7100 HJ35 HF85 HF45 HF45 1.8 Ω ❊ 3180 11 kΩ...

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