Yamaha YST-SW105 Service Manual
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YST-SW105
CONTENTS
TO SERVICE PERSONNEL .......................................... 1
SPECIFICATIONS .......................................................... 1
INTERNAL VIEW ........................................................... 2
REAR PANELS .............................................................. 2
DISASSEMBLY PROCEDURES ................................... 3
1 0 0 7 6 6

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 ......................................................... 4
PRINTED CIRCUIT BOARD ...................................... 5~7
SCHEMATIC DIAGRAM ................................................ 8
PARTS LIST ............................................................. 9~15
YST-SW105
P.O.Box 1, Hamamatsu, Japan

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Summary of Contents for Yamaha YST-SW105

  • Page 1: Table Of Contents

    YST-SW105 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

    If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food. SPECIFICATIONS Weight ........... 9.5 kg (20 lbs. 15 oz.) Type ..Advanced Yamaha Active Servo Technology Output Power ....100 W/100 Hz, 5 Ω 10% T.H.D. Finish Ω...
  • Page 3: Internal View

    YST-SW105 INTERNAL VIEW 1 MAIN P. C. B. (4) 2 MAIN P. C. B. (3) 3 MAIN P. C. B. (1) 4 MAIN P. C. B. (2) 5 Power Transformer Right side internal view REAR PANELS U, C models R model...
  • Page 4: Disassembly Procedures

    YST-SW105 DISASSEMBLY PROCEDURES (Remove parts in the order as numbered.) For exchanging the driver unit 1. Removal of Front Grille The front grille is fixed to the cabinet with dowels at 4 locations. As a screwdriver (for slotted head screw) is used for removal, use special care not to cause damage to the cabinet.
  • Page 5: Confirmation Of Auto Standby Operation

    YST-SW105 CONFIRMATION OF AUTO STANDBY OPERATION Setting 4) Set the AUTO STANDBY switch to the HIGH position. 1) Turn off the power switch. AUTO STANDBY 2) In order to shorten the time required for operation check; connect a 10kΩ resistor at both ends of R60 on HIGH the MAIN P.C.B.
  • Page 6: Printed Circuit Board

    YST-SW105 PRINTED CIUCUIT BOARD (Foil side) MAIN P. C. B. (1) From MAIN (6) From MAIN (2) BASS MAIN TOVL To MAIN (4) TOVL From MAIN (3) SPEAKER ー MAIN P. C. B. (5) MAIN P. C. B. (4) POWER...
  • Page 7 YST-SW105 PRINTED CIUCUIT BOARD (Foil side) From MAIN (3) From MAIN (7) (R, T models) From MAIN (8) (J, U, C, A, B, G models) To MAIN (1) MAIN P. C. B. (2) 1MΩ From MAIN (5) From MAIN (2) MAIN P.
  • Page 8 YST-SW105 PRINTED CIUCUIT BOARD (Foil side) MAIN P. C. B. (9) MAIN P. C. B. (7) MAIN P. C. B. (6) (R, T models) (R, T models) POWER TRANSFORMER VOLTAGE SELECTOR To MAIN (7) To MAIN (1) From MAIN (9) MAIN P.
  • Page 9: Schematic Diagram

    YST-SW105 SCHEMATIC DIAGRAM 14.8 IC2 : TDA7293V 14.1 14.7 100W DMOS Audio Amp. 14.7 BUFFER DRV +PWVs BOOT LOADER SGND BOOT STRAP MUTE CLIP DET MUTE THERMAL SHUTDOWN PROTECTION STBY STBY 14.8 14.0 11.4 STBY-GND -PWVs -14.4 -14.4 14.7 -1.8 IC1 : NJM4558L OP Amp.
  • Page 10: Parts List

    YST-SW105 WARNING PARTS LIST Components having special characteristics are marked s and must be replaced with parts having specifications equal to those originally in- stalled. ELECTRICAL PARTS 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 11 YST-SW105 P. C. B. MAIN Schm Schm Ref. PART NO. Description Markets Ref. PART NO. Description Markets V7097000 P.C.B. MAIN VE326200 C.MYLAR.ML 0.15uF V7097100 P.C.B. MAIN VE326200 C.MYLAR.ML 0.15uF V7097200 P.C.B. MAIN UM417100 C.EL 10uF V7097300 P.C.B. MAIN UM417100 C.EL...
  • Page 12 YST-SW105 P. C. B. MAIN Schm Schm Ref. PART NO. Description Markets Ref. PART NO. Description Markets HV753220 R.CAR.FP 2.2Ω 1/4W HV753220 R.CAR.FP 2.2Ω 1/4W UCABG HB026330 R.MTL.FLM 3.3KΩ 1/4W HB028100 R.MTL.FLM 100KΩ 1/4W HB027200 R.MTL.FLM 20KΩ 1/4W HB027100 R.MTL.FLM 10KΩ...
  • Page 13: Exploded View

    YST-SW105 EXPLODED VIEW 5-15 5-23 5-11 5-19 5-38 5-16 5-34 5-38 5-33 5-32 5-22 5-37 5-14 R, T models 5-36 5-32 5-35 5-13 5-32 5-39 5-25 5-21 5-12 5-24 5-20 5-35 (7),(8) 4-11 5-35 5-17 5-18 4-11 5-18 5-17 1 Adhesive is applied here.
  • Page 14 YST-SW105 MECHANICAL PARTS Ref. PART NO. Description Remarks Markets V7292200 CABINET ASS'Y V7292300 CABINET ASS'Y XZ951A00 LOUD SPEAKER JA2165 20cm 6Ω V7292400 FRONT GRILLE ASS'Y V7292500 FRONT GRILLE ASS'Y V2192200 EMBLEM YAMAHA VP161000 PUSH NUT SPN1.5 V7108500 FRONT PANEL UCRTABG...
  • Page 15 YST-SW105 Ref. PART NO. Description Remarks Markets 5-37 V6655200 BIND HEAD S-TITE SCREW MFZN2BL 5-38 VA847600 BIND HEAD P-TITE SCREW 4x12 MFZN2-BL 5-39 VK173200 SCREW, TRANSISTOR 3x15 SP FCM3 V5984800 PACKING V5984900 BUSH, B V7636500 REAR COVER EP040070 BIND HEAD TAPPING SCREW...
  • Page 16 YST-SW105 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...
  • Page 17 YST-SW105...

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