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YST-MS201
POWERED MULTIMEDIA SPEAKERS
YST-MS201 SERVICE MANUAL
L R
YST-MS201
FROM FROM
SUBWOOFER SUBWOOFER
POWERED MULTIMEDIA SPEAKERS
YST-MS201 VOLUME
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.
s CONTENTS
TO SERVICE PERSONNEL .......................................... 1 IC BLOCK DIAGRAM .................................................... 5
SPECIFICATIONS .......................................................... 1 SCHEMATIC DIAGRAM ................................................ 6
REAR PANELS .............................................................. 2 PARTS LIST ............................................................. 7~11
DISASSEMBLY PROCEDURES ................................... 3
PRINTED CIRCUIT BOARD .......................................... 4
100725
P.O.Box 1, Hamamatsu, Japan
YST-MS201
s TO SERVICE PERSONNEL
1. Critical Components Information
Components having special characteristics are marked s
and must be replaced with parts having specifications equal
to those originally installed. AC LEAKAGE
WALL EQUIPMENT TESTER OR
2. Leakage Current Measurement (For 120V Models Only) OUTLET UNDER TEST EQUIVALENT
When service has been completed, it is imperative to verify
that all exposed conductive surfaces are properly insulated
from supply circuits.
q Meter impedance should be equivalent to 1500 ohm shunted
by 0.15µF.
INSULATING
q Leakage current must not exceed 0.5mA. TABLE
q Be sure to test for leakage with the AC plug in both polarities.
WARNING: CHEMICAL CONTENT NOTICE!
The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or plastic (where
applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency (and
possibly other entities) to cause cancer and/or birth defects or other reproductive harm.
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC 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.
s SPECIFICATIONS
Type Active Servo Technology Power Supply
Driver U.S.A. and Canada models AC 120V, 60 Hz
Satellite 8.5 cm (3-3/8") x 4.5 cm (1-3/4") cone U.K. and Europe models AC 230V, 50 Hz
Magnetically shielded type Australia model AC 240V, 50 Hz
Subwoofer 12 cm (4-3/4") cone Dimensions (W x H x D)
Magnetically shielded type (JA1287) Satellite 70 x 195 x 145 mm
Amplifier Output (2-3/4" x 7-11/16" x 5-11/16")
Satellite 6 W + 6 W (1 kHz, 4 at T.H.D.=10%) Subwoofer 193 x 207 x 214 mm
Subwoofer 18 W (100 Hz, 4 at T.H.D.=10%) (7-5/8" x 8-1/8" x 8-7/16")
Input Sensitivity 200 mV (1 kHz, 4 at 6 W) Weight
Input Impedance 20 k Satellite 0.6 kg (1.3 lb.) / R ch unit
0.5 kg (1.1 lb.) / L ch unit
Frequency Response 45 Hz to 20 kHz Subwoofer 2.8 kg (6.2 lb.)
(Satellite + Subwoofer)
Finish White, Black
Accessory AC Adaptor (DC 15V, 1.2A) x 1
* Specifications subject to change without notice.
J ......... Japan model U .... U.S.A. model
C ........ Canada model R .... General model
A ........ Australia model B ..... British model
G ........ Europe model
1
YST-MS201
s Dimensions
195 (7-11/16")
207 (8-1/8")
POWERED MULTIMEDIA SPEAKERS
YST-MS201 VOLUME
128 (5-1/16")
60 (2-3/8") 60 (2-3/8") 145 (5-11/16")
70 (2-3/4") 193 (7-5/8") 70 (2-3/4") 214 (8-7/16")
s REAR PANELS (Subwoofer)
U, C models A model
B, G models J model
2
YST-MS201
s DISASSEMBLY PROCEDURES
(Subwoofer)
(Remove parts in disassembly order as numbered.)
1. Removal of Rear Panel Ass'y
Remove 8 screws (1) and then remove the Rear Panel
Ass'y.
2. Removal of Front Grille Ass'y
a. Insert the tip of flat tip (-) screwdriver to slot located at
bottom side of the Front Grille Ass'y.
b. Pry the Front Grille Ass'y by applying force to the
screwdriver.
note) Take special care not to cause damage to the
cabinet when using the screwdriver.
3. Removal of Speaker
Remove 4 screws (2) and then remove the Speaker.
1
1 1
11
1
1
1
2
2
2
2
3
A B C D E F G H I
YST-MS201
1
s PRINTED CIRCUIT BOARD (Parts side) s IC BLOCK DIAGRAM
µPC4570HA TDA7370BV
Dual OP-Amp. Quad Power Amp.
OUT
IN
E
Vcc Vcc
13 3
A1
SP+ +
1 OUT1
Subwoofer
SP- 1 2 INPUT1 4
2 - -
A2 INV.
STAND-BY 7 +
2 OUT2
INPUT2 5
A3
+
15 OUT3
INPUT3 12
A4 INV.
+
14 OUT4
3
INPUT4 11 19 CLIP DET
6 8 9
SVR PW-GND S-GND
NJM78L06A
PSW
VCC Regulator
SP+
SP-
OR
IR
E CON2
IL
OL
VIN
4 RSP+
RSPG CON4
DC+
DC-
VOUT
RSPG
RSP+
PSW
OUT
VCC
DC+
Right Speaker
SP+
DC-
OR
SP-
OL
IN
IR
IL
E
E
GND
5
RSPG
RSP+
PSW
VCC
OR
OL
IR
IL
E
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
BASS TO LEFT DC IN TO RIGHT 2SC1815 1SS133 µPC4570HA NJM78L06A TDA7370BV
6 SPEAKER 15V SPEAKER 2SA1015 Anode
9
OUT 1
E Cathode COM IN
CB
1 8
7
VOLUME
4 5
A B C D E F G H I J
YST-MS201
1
s SCHEMATIC DIAGRAM
3
2
4
3
2 6
4 8
7
2
6
8 3 6
7 2 8
4 7
3
4
3
2
4
6
5 8
7
5 All voltage are measured with a
10M/V DC electric volt meter.
5 Components having special
characteristics are marked s and
must be replaced with parts having
specifications equal to those
6
originally installed.
5 Schematic diagram is subject to
change without notice.
s
7
6
s WARNING YST-MS201
PARTS LIST Components having special characteristics are marked s and must be
replaced with parts having specifications equal to those originally in-
stalled.
s ELECTRICAL PARTS q 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.
ABBREVIATIONS IN THIS LIST ARE AS FOLLOWS:
C.A.EL.CHP : CHIP ALUMI.ELECTROLYTIC CAP L.EMIT : LIGHT EMITTING MODULE
C.CE : CERAMIC CAP LED.DSPLY : LED DISPLAY
C.CE.ARRAY : CERAMIC CAP ARRAY LED.INFRD : LED,INFRARED
C.CE.CHP : CHIP CERAMIC CAP MODUL.RF : MODULATOR,RF
C.CE.ML : MULTILAYER CERAMIC CAP PHOT.CPL : PHOTO COUPLER
C.CE.M.CHP : CHIP MULTILAYER CERAMIC CAP PHOT.INTR : PHOTO INTERRUPTER
C.CE.SAFTY : RECOGNIZED CERAMIC CAP PHOT.RFLCT : PHOTO REFLECTOR
C.CE.TUBLR : CERAMIC TUBULAR CAP PIN.TEST : PIN,TEST POINT
C.CE.SMI : SEMI CONDUCTIVE CERAMIC CAP PLST.RIVET : PLASTIC RIVET
C.EL : ELECTROLYTIC CAP R.ARRAY : RESISTOR ARRAY
C.MICA : MICA CAP R.CAR. : CARBON RESISTOR
C.ML.FLM : MULTILAYER FILM CAP R.CAR.CHP : CHIPRESISTOR
C.MP : METALLIZED PAPER CAP R.CAR.FP : FLAME PROOF CARBON RESISTOR
C.MYLAR : MYLAR FILM CAP R.FUS : FUSABLE RESISTOR
C.MYLAR.ML : MULTILAYER MYLAR FILM CAP R.MTL.CHP : CHIP METAL FILM RESISTOR
C.PAPER : PAPER CAPACITOR R.MTL.FLM : METAL FILM RESISTOR
C.PLS : POLYSTYRENE FILM CAP R.MTL.OXD : METAL OXIDE FILM RESISTOR
C.POL : POLYESTER FILM CAP R.MTL.PLAT : METAL PLATE RESISTOR
C.POLY : POLYETHYLENE FILM CAP RSNR.CE : CERAMIC RESONATOR
C.PP : POLYPROPYLENE FILM CAP RSNR.CRYS : CRYSTAL RESONATOR
C.TNTL : TANTALUM CAP R.TW.CEM : TWIN CEMENT FIXED RESISTOR
C.TNTL.CHP : CHIP TANTALUM CAP R.WW : WIRE WOUND RESISTOR
C.TRIM : TRIMMER CAP SCR.BND.HD : BIND HEAD B-TITE SCREW
CN : CONNECTOR SCR.BW.HD : BW HEAD TAPPING SCREW
CN.BS.PIN : CONNECTOR,BASE PIN SCR.CUP : CUP TITE SCREW
CN.CANNON : CONNECTOR,CANNON SCR.TERM : SCREW TERMINAL
CN.DIN : CONNECTOR,DIN SCR.TR : SCREW,TRANSISTOR
CN.FLAT : CONNECTOR,FLAT CABLE SUPRT.PCB : SUPPORT,P.C.B.
CN.POST : CONNECTOR,BASE POST SURG.PRTCT : SURGE PROTECTOR
COIL.MX.AM : COIL,AM MIX SW.TACT : TACT SWITCH
COIL.AT.FM : COIL,FM ANTENNA SW.LEAF : LEAF SWITCH
COIL.DT.FM : COIL,FM DETECT SW.LEVER : LEVER SWITCH
COIL.MX.FM : COIL,FM MIX SW.MICRO : MICRO SWITCH
COIL,OUTPT : OUTPUT COIL SW.PUSH : PUSH SWITCH
DIOD.ARRAY : DIODE ARRAY SW.RT.ENC : ROTARY ENCODER
DIODE.BRG : DIODE BRIDGE SW.RT.MTR : ROTARY SWITCH WITH MOTOR
DIODE.CHP : CHIP DIODE SW.RT : ROTARY SWITCH
DIODE.VAR : VARACTOR DIODE SW.SLIDE : SLIDE SWITCH
DIOD.Z.CHP : CHIP ZENER DIODE TERM.SP : SPEAKERTERMINAL
DIODE.ZENR : ZENER DIODE TERM.WRAP : WRAPPING TERMINAL
DSCR.CE : CERAMIC DISCRIMINATOR THRMST.CHP : CHIP THERMISTOR
FER.BEAD : FERRITE BEADS TR.CHP : CHIP TRANSISTOR
FER.CORE : FERRITE CORE TR.DGT : DIGITAL TRANSISTOR
FET.CHP : CHIP FET TR.DGT.CHP : CHIP DIGITAL TRANSISTOR
FL.DSPLY : FLUORESCENT DISPLAY TRANS : TRANSFORMER
FLTR.CE : CERAMIC FILTER TRANS.PULS : PULSE TRANSFORMER
FLTR.COMB : COMB FILTER MODULE TRANS.PWR : POWERTRANSFORMER ASS'Y
FLTR.LC.RF : LC FILTER,EMI TUNER.AM : TUNER PACK,AM
GND.MTL : GROUND PLATE TUNER.FM : TUNER PACK,FM
GND.TERM : GROUND TERMINAL TUNER.PK : FRONT-ENDTUNER PACK
HOLDER.FUS : FUSE HOLDER VR : ROTARY POTENTIOMETER
IC.PRTCT : IC PROTECTOR VR.MTR : POTENTIOMETER WITH MOTOR
JUMPER.CN : JUMPER CONNECTOR VR.SW : POTENTIOMETER WITH ROTARY SW
JUMPER.TST : JUMPER,TEST POINT VR.SLIDE : SLIDEPOTENTIOMETER
L.DTCT : LIGHT DETECTING MODULE VR.TRIM : TRIMMER POTENTIOMETER
Note) Those parts marked with "#" are not included in the P.C.B. ass'y.
7
YST-MS201
s ELECTRICAL PARTS
New Parts
8
YST-MS201
New Parts
A B C D E
YST-MS201
1
s EXPLODED VIEW 11
9-9
9-1 9-10
11
9-2 9-8
6
9-9
2
9-8 9-7
9-9 9-10
9-5 11
9-9
9-2
3
9-3
7 8
9-4
7
4
4
3 5
12
8
5
1-1
1 2
2-1
6
1.8 m
1-2
200 1.8
7 m
2-2
9
YST-MS201
s MECHANICAL PARTS
New Parts
10
YST-MS201
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 HJ35 3100 HF85 3100 10 k HF45 7100 HF45 7100
1.8 HJ35 3180 11 k HF45 7110 HF45 7110
2.2 HJ35 3220 HF85 3220 12 k HJ35 7120 HF85 7120
3.3 HJ35 3330 HF85 3330 13 k HF45 7130 HF45 7130
4.7 HJ35 3470 HF85 3470 15 k HF45 7150 HF45 7150
5.6 HJ35 3560 HF85 3560 18 k HF45 7180 HF45 7180
10 HF45 4100 HF45 4100 22 k HF45 7220 HF45 7220
15 HJ35 4150 HF85 4150 24 k HF45 7240 HF45 7240
22 HF45 4220 HF45 4220 27 k HJ35 7270 HF85 7270
27 HJ35 4270 HF85 4270 30 k HF45 7300 HF45 7300
33 HF45 4330 HF45 4330 33 k HF45 7330 HF45 7330
39 HJ35 4470 HF85 4390 36 k HF45 7360 HF45 7360
47 HF45 4470 HF45 4470 39 k HF45 7390 HF45 7390
56 HF45 4560 HF45 4560 47 k HF45 7470 HF45 7470
68 HF45 4680 HF45 4680 51 k HF45 7510 HF45 7510
75 HF45 4750 HF45 4750 56 k HF45 7560 HF45 7560
82 HF45 4820 HF45 4820 62 k HF45 7620 HF45 7620
91 HF45 4910 HF45 4910 68 k HF45 7680 HF45 7680
100 HF45 5100 HF45 5100 82 k HF45 7820 HF45 7820
110 HJ35 5110 HF85 5110 91 k HF45 7910 HF45 7910
120 HF45 5120 HF45 5120 100 k HF45 8100 HF45 8100
150 HF45 5150 HF45 5150 110 k HF45 8110 HF45 8110
160 HJ35 5160 120 k HF45 8120 HF45 8120
180 HF45 5180 HF45 5180 150 k HF45 8150 HF45 8150
200 HF45 5200 HF45 5200 180 k HF45 8180 HF45 8180
220 HF45 5220 HF45 5220 220 k HJ35 8220 HF85 8220
270 HF45 5270 HF45 5270 270 k HF45 8270 HF45 8270
330 HF45 5330 HF45 5330 300 k HF45 8300 HF45 8300
390 HF45 5390 HF45 5390 330 k HF45 8330 HF45 8330
430 HF45 5430 HF45 5430 390 k HJ35 8390 HF85 8390
470 HF45 5470 HF45 5470 470 k HF45 8470 HF45 8470
510 HF45 5510 HF45 5510 560 k HJ35 8560 HF85 8560
560 HF45 5560 HF45 5560 680 k HJ35 8680 HF85 8680
680 HF45 5680 HF45 5680 820 k HJ35 8820 HF85 8820
820 HF45 5820 HF45 5820 1.0 M HF45 9100 HF45 9100
910 HF45 5910 HF45 5910 1.2 M HJ35 9120
1.0 k HF45 6100 HF45 6100 1.5 M HJ35 9150 HF85 9150
1.2 k HF45 6120 HF45 6120 1.8 M HJ35 9180 HF85 9180
1.5 k HF45 6150 HF45 6150 2.2 M HJ35 9220 HF85 9220
1.8 k HF45 6180 HF45 6180 3.3 M HJ35 9330 HF85 9330
2.0 k HJ35 6200 HF85 6200 3.9 M HJ35 9390
2.2 k HF45 6220 HF45 6220 4.7 M HJ35 9470 HF85 9470
2.4 k HJ35 6240 HF85 6240
2.7 k HF45 6270 HF45 6270
3.0 k HF45 6300 HF45 6300 1/4W Type
3.3 k HF45 6330 HF45 6330 HF45
3.6 k HJ35 6360 HF85 6360 1/4W Type 1/6W Type
3.9 k HF45 6390 HF45 6390 HJ35 HF85
4.7 k HF45 6470 HF45 6470 10mm
5mm
5.1 k HF45 6510 HF45 6510
5.6 k HF45 6560 HF45 6560
6.8 k HF45 6680 HF45 6680
8.2 k HF45 6820 HF45 6820
9.1 k HF45 6910 HF45 6910
: Not available
11