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YST-SW105

SERVICE  MANUAL

SUBWOOFER SYSTEM

YST-SW105

1 0 0 7 6 6

CONTENTS

TO SERVICE PERSONNEL .......................................... 1
SPECIFICATIONS .......................................................... 1
INTERNAL VIEW ........................................................... 2
REAR PANELS .............................................................. 2
DISASSEMBLY PROCEDURES ................................... 3

CONFIRMATION OF AUTO STANDBY OPERATION ...... 4
BLOCK DIAGRAM ......................................................... 4
PRINTED CIRCUIT BOARD ...................................... 5~7
SCHEMATIC DIAGRAM ................................................ 8
PARTS LIST ............................................................. 9~15

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-SW105

P.O.Box 1, Hamamatsu, Japan

Summary of Contents for YST-SW105

Page 1: ...ormed 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 o...

Page 2: ...ose 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 ohm shunted by 0 15µF Leakage current must not exceed 0 5mA Be sure to test for leakage with the AC plug in both polarities SPECIFICATIONS ...

Page 3: ...YST SW105 1 2 3 4 5 Right side internal view 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 REAR PANELS U C models R model A model B G model T model 2 ...

Page 4: ...g 3 Use an Allen wrench 3 mm to unscrew the Front Panel Ass y 2 Removal of Rear Panel Remove 12 screws 3 in Fig 4 and remove the rear panel At this time disconnect the connector CB3 of MAIN P C B 1 When removing the rear panel replace the packing 3 P C B Operation Check a Disconnect the connector CB9 of MAIN P C B 4 b Connect the connector CB3 of MAIN P C B 1 and CB9 of MAIN P C B 4 by using an ex...

Page 5: ...me required for operation check connect a 10kΩ resistor at both ends of R60 on the MAIN P C B 2 3 Connect the output signal from the signal generator to the INPUT 2 of the unit 4 Set the signal generator for the sine wave of 100Hz 8mV 5 Turn on the power switch Confirmation 1 Set the AUTO STANDBY switch to the LOW position AUTO STANDBY OFF HIGH LOW 2 Turn on the STANDBY ON switch The display LED l...

Page 6: ...Y ON B A S S HIGH CUT VOLUME From MAIN 1 MAIN P C B 4 TOVL E MAIN BASS V2 15 15 PWS VCC 1 9 1 1 8 9 15 From MAIN 6 From MAIN 2 From MAIN 3 To MAIN 4 SPEAKER MAIN P C B 1 RE RE VCC E PWS V1 VCC PWS 15 15 V2 BASS MAIN E TOVL BL 15 15 15 TOVL E E SP SP ー 5 PRINTED CIUCUIT BOARD Foil side ...

Page 7: ...O STANDBY LOW HIGH OFF INPUT 2 OUTPUT INPUT 1 E E TOVL 15 15 15 SWL SWH2 SWH1 SO E 1 1 8 9 From MAIN 5 From MAIN 7 R T models From MAIN 8 J U C A B G models From MAIN 3 To MAIN 1 MAIN P C B 2 SWL SWH2 SWH1 SO E V1 PWS E VCC WH BE OR GY R60 1MΩ 6 PRINTED CIUCUIT BOARD Foil side ...

Page 8: ...AGE SELECTOR YE BE GR RE BR BL To MAIN 1 POWER TRANSFORMER J U C A B G models From MAIN 2 MAIN P C B 8 MAIN P C B 6 RE WH BE RE BL To MAIN 1 POWER TRANSFORMER From MAIN 9 MAIN P C B 7 MAIN P C B 6 RE WH RE BL YE BR GR BE BE RE BL R T models 7 PRINTED CIUCUIT BOARD Foil side ...

Page 9: ...15 2SC2240 2SA970 2SC2878 E C B 1SS133 MTZ15C MTZJ24B MTZJ12C µPC4570HA Anode Cathode 1 9 M51848L µPC1237HA NJM78L08A TDA7293V 1 8 NJM4558L 1 8 OUT COM IN S GD 1 15 V c c V o 1 V m1 V m1 V E E V m2 V m2 V o 2 V c c 1 2 3 4 5 6 7 8 9 1 2 VIN VOUT GND 1 2 3 4 8 6 5 7 OUT1 IN1 IN1 Vcc IN2 IN2 OUT2 Vcc 2 3 4 10 9 1 8 6 5 7 11 13 14 12 15 OUT PWVs BUFFER DRV Vs Vs STBY GND PWVs BOOT LOADER BOOT STRAP C...

Page 10: ...DULE 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 P...

Page 11: ... 82uF 50V C62 VE326200 C MYLAR ML 0 15uF 50V C63 VE326200 C MYLAR ML 0 15uF 50V C64 VE326200 C MYLAR ML 0 15uF 50V C65 UM417100 C EL 10uF 50V C66 UM417100 C EL 10uF 50V C74 UR837100 C EL 10uF 16V C84 UR847100 C EL 10uF 25V RT C100 UR838100 C EL 100uF 16V C101 UA655470 C MYLAR 0 47uF 50V s D1 VN011300 DIODE BRG D3SBA20 4A 200V D2 VG440900 DIODE ZENR MTZJ15C 15V D3 VG440900 DIODE ZENR MTZJ15C 15V D4...

Page 12: ... s RY1 VU161600 RELAY DC OSA SS 224DM3 s RY2 V2712300 RELAY DC SDT S 112LMR RT s RY2 VU349800 RELAY DC SDT SS 112DM UCABG SW1 VS066500 SW PUSH SPPH13 W SW2 VD179500 SW SLIDE SSSU12 SW4 VS066500 SW PUSH SPPH13 W SW6 V7182300 VOLT SELCT R8140213 RT s T1 XV443A00 TRANS PWR UC s T1 XV445A00 TRANS PWR ABG s T1 XW607A00 TRANS PWR RT TE1 VT658100 TERM WRAP 352 TX119 TE2 VT658100 TERM WRAP 352 TX119 TE3 V...

Page 13: ...3 2 3 1 5 8 5 20 5 17 5 18 5 17 5 18 5 5 21 5 1 5 21 5 36 21 5 15 5 11 5 38 5 23 21 5 34 5 38 5 33 21 21 13 5 37 5 7 5 6 5 19 5 22 5 1 5 1 5 1 5 32 5 32 5 32 5 1 5 1 5 35 5 35 5 24 5 12 5 39 5 1 5 1 5 16 5 13 5 14 5 35 5 25 2 11 22 12 21 1 203 3 R T models 9 1 6 7 8 2 3 5 4 12 EXPLODED VIEW ...

Page 14: ...ER TRANSFORMER BG s 5 6 V2689600 POWER CORD 10A SPT 2 2m UC s 5 6 V6792800 POWER CORD 7 5A 2m A s 5 6 V6893100 POWER CORD 2 5A 250V 2m G s 5 6 V6977100 POWER CORD 6 0A 2m B s 5 6 VZ555600 POWER CORD 10A 250V 2m RT 5 7 CB072750 CORD STOPPER SR 4N 4 5 8 CB069250 BINDING TIE BK 1 5 11 V7026400 REAR PANEL UC 5 11 V7026500 REAR PANEL RT 5 11 V7026600 REAR PANEL A 5 11 V7026700 REAR PANEL BG 5 12 V70268...

Page 15: ...TE SCREW 4x12 MFZN2 BL 5 39 VK173200 SCREW TRANSISTOR 3x15 SP FCM3 11 V5984800 PACKING 12 V5984900 BUSH B 13 V7636500 REAR COVER 21 EP040070 BIND HEAD TAPPING SCREW 4x20 ZMC2 BL 22 V5537800 HEXAGON SOCKET TAPPING SCREW 4x20 MFZN2BL BL 22 V7275700 HEXAGON SOCKET TAPPING SCREW 4x20 MFNI33 CH ACCESSORIES 203 V5982400 NON SKID PAD 4 pcs set 14 ...

Page 16: ...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 HF45 4750 8...

Page 17: ...YST SW105 ...

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