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POWERED MULTIMEDIA SPEAKERS
YST-MS50
The contents of this Service Manual are applicable to the products with serial numbers of
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:
IMPORTANT:
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, inevita-
ble 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:
IMPORTANT:
CONTENTS
TO SERVICE PERSONNEL . . . . . . . . . . . . . . . . . . . . 1
FRONT AND REAR PANELS . . . . . . . . . . . . . . . 1 - 2
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INTERNAL VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
DISASSEMBLY PROCEDURES . . . . . . . . . . . . . . . . . 5
1 0 0 7 7 8
SERVICE MANUAL
SERVICE MANUAL
IMPORTANT NOTICE
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.
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.
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).
Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the
unit.
PRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . . 6 - 8
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . 10
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 - 15
PARTS LIST FOR CARBON RESISTORS . . . . . . . . 16
(M)
Z200001
and up.
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Table of Contents
Related Manuals for Yamaha YSTMS50B
Summary of Contents for Yamaha YSTMS50B
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Page 1: Table Of Contents
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
YST-MS50 TO SERVICE PERSONNEL AC LEAKAGE 1. Critical Components Information EQUIPMENT WALL TESTER OR Components having special characteristics are marked Z OUTLET UNDER TEST EQUIVALENT and must be replaced with parts having specifications equal to those 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 INSULATING... - Page 3 YST-MS50 Subwoofer Front Panel Subwoofer Rear Panel U and C models B and G models A model...
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Page 4: Specifications
YST-MS50 SPECIFICATIONS DIMENSIONS Type ......... Advanced Active Servo Technology Output Power Satellite ....20W+20W (1kHz, 4 ohms at T.H.D.=10%) Satellite Speaker Subwoofer ....40W (100Hz, 5 ohms at T.H.D.=10%) Input Sensitivity ...... 200mV (1kHz, 4 ohms at 20W) Input Impedance ............25 kohms Frequency Response ........ -
Page 5: Internal View
YST-MS50 INTERNAL VIEW Satellite Speakers Note: The Satellite Speakers are available by the speaker unit (L ch or R ch). Individual parts of the Satellite Speakers are not available. (See page 14 and 15 of the PARTS LIST.) Satellite Speaker (L ch) MAIN (B) P.C.B. -
Page 6: Disassembly Procedures
YST-MS50 DISASSEMBLY PROCEDURES (Remove parts in the order as numbered.) Disassemble of the Subwoofer 3. Removal of the Speaker a. Set up the front panel ass’y in the direction of the 1. Removal of the Rear Panel Ass’y. a. Remove 8 screws ( q ) in Fig. 1, and remove the arrow, in Fig. - Page 7 YST-MS50 PRINTED CIRCUIT BOARD (Component side) Subwoofer Semiconductor Location MAIN ( A ) P. C. B. Ref. No. Location TO : SPEAKER (WOOFER) FROM : POWER CORD BL: U, C WH: U, C BR: A, B, G BE: A, B, G Ref.
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Page 8: Printed Circuit Board
YST-MS50 PRINTED CIRCUIT BOARD (Component side) BLOCK DIAGRAM Satellite Speaker (R ch) MAIN ( C ) P. C. B. VOLUME (POWER) (HEADPHONE) Semiconductor Location Ref. No. Location TO : MAIN ( D ) MAIN ( D ) P. C. B. –... -
Page 9: Schematic Diagram
YST-MS50 SCHEMATIC DIAGRAM PIN CONNECTION DIAGRAM OF TRAN- SISTORS, DIODES AND ICS. 1SS133 NJM4556AL Anode INPUT 2 SATELLITE TWEETER – Cathode L ch INPUT 1 RBV-402 SATELLITE SUB Wo. NJM4558D MIDRANGE – VOLUME – L ch PHONE AMP 11.7 MAIN ( B ) 2SA1015 (O, Y) 2SC1815 (Y, GR) 2SC2878 (A, B) -
Page 10: Parts List
YST-MS50 WARNING PARTS LIST Components having special characteristics are marked Z 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 ELECTRICAL PARTS List. For the parts No. of the carbon resistors, refer to last page. ABBREVIATIONS IN THIS LIST ARE AS FOLLOWS : C.A.EL.CHP : CHIP ALUMI. - Page 11 YST-MS50 P.C.B. MAIN Schm Schm Ref. PART NO. Description Remarks Ref. PART NO. Description Remarks New Parts New Parts...
- Page 12 YST-MS50 P.C.B. MAIN Schm Schm Ref. PART NO. Description Remarks Ref. PART NO. Description Remarks New Parts New Parts...
- Page 13 YST-MS50 EXPLODED VIEW 6-12 6-11 5-33 5-31 6-3-1 5-32 6-12 5-15 5-34 5-16 5-15 5-11 5-16 5-31 5-14 5-17 5-12 5-17 5-20...
- Page 14 YST-MS50 MECHANICAL PARTS New Parts...
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Page 15: Parts List For Carbon Resistors
YST-MS50 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. 3100 3100 7100 10 k 7100 HJ35 HF85 HF45 HF45 3180 7110 11 k 7110 HJ35 HF45 HF45 3220...