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CONTENTS

TO SERVICE PERSONNEL .......................................... 2
SPECIFICATIONS / 

参考仕様

........................................ 3

INTERNAL VIEW ........................................................... 4
REAR PANELS .......................................................... 4~5
DISASSEMBLY PROCEDURES

 / 分解手順

............. 6~7

ADJUSTMENTS / 

調整 ..............................................

8~9

BLOCK DIAGRAM ....................................................... 10
PRINTED CIRCUIT BOARD .................................. 11~12
SCHEMATIC DIAGRAM .............................................. 13
PARTS LIST ........................................................... 15~22

TOP VIEW

FRONT VIEW

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.

 2005                                         All rights reserved.

P.O.Box 1, Hamamatsu, Japan

YST-SW325

 '05.07

1 0 0 9 6 1

SERVICE  MANUAL

SUBWOOFER SYSTEM

YST-SW325

Summary of Contents for YST-SW325 - Subwoofer - 170 Watt

Page 1: ...epresentative 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 Y...

Page 2: ...C 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 About Lead Free Solder 無鉛ハンダについて Side A Side B SMT REFLOW Pro...

Page 3: ...100 V 50 60 Hz Power Consumption 消費電力 U C R T K A B G L models 70 W J model 60 W Standby Power Consumption 待機時消費電力 0 5 W Dimensions 外形寸法 W x H x D 315 x 380 x 374 mm 12 7 16 x 15 x 14 3 4 Weight 質量 13 0 kg 28 lbs 10 oz Finish Cherry Color U C R T K A B G L J models Black Color U C R T K A B G L J models Accessories 付属品 Speaker cable 4 m x 2 J model Subwoofer Cable 5 m x 1 J model Nonskid Pad x 4 S...

Page 4: ...ls Front Side Rear Side 1 MAIN 8 P C B 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 1 2 3 4 5 6 7 8 9 0 A B 2 3 4 5 6 7 8 B A 9 0 INTERNAL VIEW ...

Page 5: ...YST SW325 5 YST SW325 T model B G models J model L model K model A model ...

Page 6: ... the MAIN 8 P C B Fig 2 d Remove 5 screws 4 Fig 2 e Remove the Control Unit from the Rear panel Fig 2 f Disconnect the connector CB3 connected to the MAIN 3 P C B Fig 2 g Remove 1 screw 5 Fig 2 Screws 5 are identified with arrow marks h Remove the Rear Cover Fig 2 DISASSEMBLY PROCEDURES 分解手順 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 1 スピーカーユニットの外し方 a のネジ4本を外し ベースを取り外します Fig 1 b のネジ4本を外し スピーカーユニット...

Page 7: ... Control Unit コントロールユニット Fig 3 When Checking the P C B Assemble Rear Panel Ass y and Control Unit Connect all the connectors removed during dis assembly back to the original positions Spread cloth first and place the Rear Panel Ass y and Control panel on it Fig 3 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 てます 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 ゴムシートと布を敷き その上にリアパネルASSY とコントロールユニットを置いてチェックします Fig 3 Fig 2 ...

Page 8: ...ected Setting 1 Set the signal generator to the sine wave 100 Hz and minimum output level settings 2 Set the volume of the unit to the minimum position 3 Turn on the power to the unit 4 Adjust the output level of the signal generator and the volume of the unit so that the output level observed at oscilloscope CH2 is 28 Vp p Waveform observation With the settings made as described above observe the...

Page 9: ...Y switch to the HIGH position 5 Turn on the STANDBY ON switch The display LED lights up green and its color remains unchanged even after time have elapsed 6 Turn off the STANDBY ON switch The display LED goes off After confirmation 1 Turn off the power switch 2 Disconnect the 10kΩ resistor connected to both ends of R72 オートスタンバイ動作確認 設定 1 リアパネルにある主電源スイッチをOFFにします 2 動作確認時間を短縮するため MAIN 2 P C B にある R72の...

Page 10: ... D3 G R Q4 2 HIGH CUT VR2 PROTECTION H L OFF OFF L H R72 C39 TIMER IC7 MUSIC SENSOR IC6 8 4 6 3 7 Q9 REGULATOR IC8 Q3 L R INPUT 1 L MONO R INPUT 2 L R OUTPUT IC2A 3 2 7 4 SW1 PHASE SELECT POWER AMP LIMITER RY1 IC8 IC5 Q5 6 0 1 Q24C 32 PS AMP Q24A 33 PS AMP B B H P F 12dB oct 15 B 15 B REGULATOR POWER SUPPLY D21 Q18 Q19 F1 POWER SW5 STANDBY ON SW4 R L models REGULATOR Q1 2 D4 SUB POWER SUPPLY D1 RY...

Page 11: ...AIN 10 W3 OFF ON MOVIE MUSIC PASS ON LEDR AUT PWS PWS VCC 15 15 AUT V2 BASE CUR OUT VCC V1 E B B E E1 LEDG LEDR E1 LEDG Circuit No U C J R L T K B G A L4 5 X X O X C82 X X O X J33 106 O O X O Ref no Location D2 B2 D3 B2 D6 C4 D10 B4 D16 C6 D17 C6 D19 C6 D20 C6 D32 C5 D36 B6 D37 C6 Semiconductor Location Ref no Location IC1 F6 IC2 H6 IC3 H3 IC4 F3 Q4 C4 Q10 B5 Q11 C5 Q18 C6 Q19 C6 Q23 C5 Q28 C5 PWS...

Page 12: ...ation D21 I6 D22 I2 D23 I5 D24 I2 D25 I5 D26 I2 D27 I3 D28 I3 D29 I5 Ref no Location D30 I5 D31 I5 D33 I5 D34 J2 D35 H3 IC5 I2 IC6 B6 IC7 B6 IC8 A5 Ref no Location IC9 K3 Q1 B5 Q2 B5 Q3 B5 Q5 J4 Q6 J4 Q9 B6 Q24A I5 Q24C I3 Ref no Location Q29 J4 Q30 I3 Q31 I3 Q32 K2 Q33 K5 Q34 H3 CONFIRMATION OF AUTO STANDBY OPERATION R72 add 10 k ohms OFF LOW HIGH MAIN 1 W6B MAIN 3 CB3 MAIN 1 W7B DRIVER 1 13 9 1 ...

Page 13: ...78L08A T3 µPC4570HA A LB8555D Anode Cathode E C B B C E B C E IC9 STK404 140S AF Power Amp STK404 140S 1 13 0 0 0 0 0 0 0 0 0 14 5 14 4 0 0 0 0 0 0 0 0 0 0 0 0 0 8 0 4 6 4 6 5 3 0 0 0 0 AC12 1 0 0 0 1 9 1 9 1 4 8 0 12 4 12 5 0 1 4 0 4 0 0 6 7 6 8 4 1 0 1 4 6 6 8 0 14 3 14 3 14 5 14 5 14 4 0 0 14 5 1 9 1 8 2 5 7 3 8 0 5 9 6 6 7 8 7 8 7 2 6 2 3 1 2 5 5 7 0 1 1 2 0 1 2 0 1 2 0 14 5 15 0 15 0 0 0 14 9...

Page 14: ...ET 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 COU...

Page 15: ...FTY 1500pF 250V 規格認定コン KH 01 C17 VE326200 C MYLAR 0 15uF 50V マイラーコン C18 UR867100 C EL 10uF 50V ケミコン 01 C19 UA654220 C MYLAR 0 022uF 50V J マイラーコン 01 C20 UA655220 C MYLAR 0 22uF 50V J マイラーコン 01 s C21 V6185300 C CE SAFTY 0 01uF 275V 規格認定コン C22 23 VE326200 C MYLAR 0 15uF 50V マイラーコン C24 UR867100 C EL 10uF 50V ケミコン 01 C25 UR778470 C EL 470uF 63V RL ケミコン C26 UR867100 C EL 10uF 50V ケミコン 01 C27 UR867100 C ...

Page 16: ...2 VS079300 LED SPR 39MVW 2色 LED 01 D3 VS079300 LED SPR 39MVW 2色 LED 01 D4 VG440300 DIODE ZENR MTZJ12C 12V RL ツェナーダイオード 01 D5 VD631600 DIODE 1SS133 176 ダイオード 01 D6 VD631600 DIODE 1SS133 176 ダイオード 01 D7 VD631600 DIODE 1SS133 176 ダイオード 01 D9 VD631600 DIODE 1SS133 176 ダイオード 01 D10 VD631600 DIODE 1SS133 176 ダイオード 01 D12 13 VD631600 DIODE 1SS133 176 ダイオード 01 D15 VD631600 DIODE 1SS133 176 ダイオード 01 D16 17...

Page 17: ...17600 TR TT2042MT トランジスタ Q34 iC224030 TR 2SC2240 GR BL トランジスタ 01 R5 HV756470 R CAR FP 4 7KΩ 1 4W 不燃化カーボン抵抗 01 R6 HV756470 R CAR FP 4 7KΩ 1 4W 不燃化カーボン抵抗 01 R9 13 HV756220 R CAR FP 2 2KΩ 1 4W 不燃化カーボン抵抗 01 R52 HV753220 R CAR FP 2 2Ω 1 4W JUCTKABG 不燃化カーボン抵抗 01 R73 HB028100 R MTL FLM 100KΩ 1 4W 金属被膜抵抗 R80 HV755100 R CAR FP 100Ω 1 4W 不燃化カーボン抵抗 01 R81 HB026330 R MTL FLM 3 3KΩ 1 4W 金属被膜抵抗 01 R100 HV754100...

Page 18: ... 06 SW7 VY858600 SW PUSH SPUP19145A プッシュSW 04 s T1 X4335A00 TRANS J サブトランス 05 s T1 X4336A00 TRANS UC サブトランス s T1 X4337B00 TRANS RL サブトランス s T1 X5785A00 TRANS TK サブトランス s T1 X5784A00 TRANS A サブトランス s T1 X4338A00 TRANS BG サブトランス TE3 V9065900 TERM SP MSP 108V 01 PBSN スピーカーターミナル 04 TP2 VT969000 PIN TEST IRS 2049 テストポイントピン 01 VR1 WD673100 VR A5KΩ 二連ロータリーVR 03 VR2 WD673000 VR C10KΩ 二連ロータリーVR 03 ...

Page 19: ...11 4 6 4 5 4 31 4 32 4 6 4 32 4 32 4 35 4 11 4 16 4 7 4 32 3 5 3 4 3 5 3 3 3 11 3 4 3 1 4 23 4 37 4 1 1 4 4 1 1 3 4 1 1 4 2 6 4 2 6 5 4 1 1 10 4 1 1 1 4 1 1 4 1 11 4 1 11 4 1 13 4 1 11 4 1 8 4 1 14 4 1 14 2 4 1 1 4 1 1 4 2 1 4 2 3 4 2 4 9 4 1 1 8 4 1 1 Replace this Bush with the new article when remove the Rear Panel Ass y リ アパネルAss yを外した場合は このブ ッ シュ を新品に交換して く だ さ い ...

Page 20: ...34A00 POWER TRANSFORMER BG 電源トランス s 4 5 V9436200 POWER CABLE 2m J 電源コード s 4 5 V2689600 POWER CABLE 2m UC 電源コード 05 s 4 5 WD042000 POWER CABLE 2m R 電源コード s 4 5 VZ555600 POWER CABLE 2m T 電源コード 05 s 4 5 V8012900 POWER CABLE 2m K 電源コード 06 s 4 5 WC883100 POWER CABLE 2m A 電源コード s 4 5 V6977100 POWER CABLE 2m B 電源コード s 4 5 V6893100 POWER CABLE 2m GL 電源コード 4 6 CB072750 CORD STOPPER SR 4N 4 コードストッパー 01 4 7 C...

Page 21: ...pe Part No 1 0 Ω HJ35 3100 HF85 3100 1 8 Ω HJ35 3180 2 2 Ω HJ35 3220 HF85 3220 3 3 Ω HJ35 3330 HF85 3330 4 7 Ω HJ35 3470 HF85 3470 5 6 Ω HJ35 3560 HF85 3560 10 Ω HF45 4100 HF45 4100 15 Ω HJ35 4150 HF85 4150 22 Ω HF45 4220 HF45 4220 27 Ω HJ35 4270 HF85 4270 33 Ω HF45 4330 HF45 4330 39 Ω HJ35 4470 HF85 4390 47 Ω HF45 4470 HF45 4470 56 Ω HF45 4560 HF45 4560 68 Ω HF45 4680 HF45 4680 75 Ω HF45 4750 HF4...

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