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POWERED MULTIMEDIA SPEAKERS
YST-MS50(M) SERVICE MANUAL
The contents of this Service Manual are applicable to the products with serial numbers of Z200001 and up.
POWERED
MULTIMEDIA
SPEAKERS YST-MS50
BASS
0
10
POWERED
MULTIMEDIA
SPEAKERS
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, 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: 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
YST-MS50(M)
unit.
s CONTENTS
TO SERVICE PERSONNEL . . . . . . . . . . . . . . . . . . . . 1 PRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . . 6 8
FRONT AND REAR PANELS . . . . . . . . . . . . . . . 1 2 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . 10
INTERNAL VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 15
DISASSEMBLY PROCEDURES . . . . . . . . . . . . . . . . . 5 PARTS LIST FOR CARBON RESISTORS . . . . . . . . 16
100778
YST-MS50(M)
s TO SERVICE PERSONNEL
AC LEAKAGE
1. Critical Components Information WALL EQUIPMENT 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
from supply circuits. TABLE
q Meter impedance should be equivalent to 1500 ohm shunted q Leakage current must not exceed 0.5mA.
by 0.15µF.
q Be sure to test for leakage with the AC plug in both
polarities.
"CAUTION"
"F1 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 2.0A, 250V FUSE."
A V
CAUTION
F1 : REPLACE WITH SAME TYPE 2.0A, 250V FUSE.
ATTENTION
F1 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 2.0A, 250V.
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 REASON 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 FRONT AND REAR PANELS
w Satellite Speakers Front Panel w Satellite Speakers Rear Panel
Lch Rch Lch Rch
YST-MS50(M)
1
YST-MS50(M)
w Subwoofer Front Panel
w Subwoofer Rear Panel
YST-MS50(M)
U and C models B and G models A model
2
YST-MS50(M)
s SPECIFICATIONS
Type ................................. Advanced Active Servo Technology q DIMENSIONS
Output Power
Satellite ................. 20W+20W (1kHz, 4 ohms at T.H.D.=10%) q Satellite Speaker
Subwoofer ................... 40W (100Hz, 5 ohms at T.H.D.=10%)
Input Sensitivity ...................... 200mV (1kHz, 4 ohms at 20W)
Input Impedance ....................................................... 25 kohms
159 (6-1/4")
166(6-17/32")
Frequency Response .................................... 32 Hz to 20 kHz
Driver
Satellite
Tweeter ................................... 19mm (3/4") balanced dome
Magnetic shielding type
Midrange ........................................................ 8cm (3") cone
Magnetic shielding type 97 (3-13/16") 178 (7")
Subwoofer ................................................. 16cm (6-1/2") cone
Magnetic shielding type
Power Consumption ........................................................ 65 W q Subwoofer
Power Supply
U, C models .................................................... AC120V, 60 Hz
A model ........................................................... AC240V, 50 Hz
B, G models .................................................... AC230V, 50 Hz
Dimensions (W X H X D)
321 (12-5/8")
Satellite ..................................................... 97 x 159 x 178 mm
(3-13/16" x 6-1/4" x 7")
Subwoofer .............................................. 350 x 210 x 321 mm
(13-3/4" x 8-1/4" x 12-5/8")
Weight
Satellite ................................................ 0.7 kg (1 lbs. 9 oz) x 2
Subwoofer ................................................ 8 kg (17 lbs. 10 oz)
Finish ....................................................................... White color
210 (8-1/4")
Black color
Accessories
3.5mm stereo mini plug cable (1.8m) x 1
RCA pin plug cable (1.8m) x 1
8 pin plug cable (1.8m) x 1 350 (13-3/4")
8 pcs of nonskid pad x 1set
* Specifications subject to change without notice. Unit : mm (inch)
U . . . . . . . . . . . . . USA model
C . . . . . . . . . Canadian model
A . . . . . . . . Australian model
B . . . . . . . . . . . British model
G . . . . . . . . . European model
YST-MS50(M)
3
YST-MS50(M)
s INTERNAL VIEW
w 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.)
Lch Rch
q w e Satellite Speaker (L ch)
q MAIN (B) P.C.B.
Satellite Speaker (R ch)
w MAIN (C) P.C.B.
e MAIN (D) P.C.B.
w Subwoofer
r t
Subwoofer
r MAIN (E) P.C.B.
t MAIN (A) P.C.B.
y SPEAKER UNIT
(Subwoofer)
u MAIN (F) P.C.B.
y u YST-MS50(M)
4
YST-MS50(M)
s DISASSEMBLY PROCEDURES
(Remove parts in the order as numbered.)
q Disassemble of the Subwoofer 3. Removal of the Speaker
1. Removal of the Rear Panel Ass'y. a. Set up the front panel ass'y in the direction of the
a. Remove 8 screws ( q ) in Fig. 1, and remove the arrow, in Fig. 2.
rear panel ass'y. b. Remove 4 screws ( w ) in Fig. 2, and remove the
* Arrow marks ( ) are printed to identify the screws to be speaker.
removed.
b. Disconnect one connector in Fig. 1.
Front Panel Ass'y
c. Disconnect the Speaker cord in Fig. 1.
* When assembling the Rear Panel Ass'y, check to ensure
that the packing is not damaged so as to prevent air leak-
age from occurring.
2. Removal of the Front Panel Ass'y
The front panel assy is fixed to the cabinet with
dowels at 6 locations.
* As a screwdriver (for slotted head screw) is used
for removal, use special care not to cause damage
to the Cabinet.
a. Using the screwdriver insert in the gaps between the
front panel ass'y and cabinet (bottom side first), push
up the front panel ass'y.
b. Remove the front panel ass'y while taking it out. w
(Front panel ass'y can not to remove completely.)
Speaker
Fig. 2
Front Panel Ass'y
Dowels
Cabinet
Speaker Cord
Connector
YST-MS50(M)
q
Gaps
Rear Panel Ass'y
Fig. 1
5
A B C D E F G H
YST-MS50 (M)
s PRINTED CIRCUIT BOARD (Component side)
1
w Subwoofer q Semiconductor Location
MAIN ( A ) P. C. B. TO : SPEAKER (WOOFER)
Ref. No.
D2
Location
B2
FROM : POWER CORD D3
D4
F3
F2
WH
BL: U, C WH: U, C
RE
D5 E2
BR: A, B, G BE: A, B, G
D6 E3
D7 E3
D8 E3
WH
Ref. No. Location
IC1 F2
IC2 E3
IC4 C2
IC5 C2
BE IC6 E2
IC7 E3
FROM : MAIN ( E )
Ref. No. Location
2 Q3
Q4
F3
F2
Q5 E2
Q6 F2
Q7 E2
Q8 E2
FROM : MAIN ( F )
3
TO RIGHT
SPEAKER
4
SPEAKER
w Satellite Speaker (L ch)
TO LEFT
MAIN ( B ) P. C. B.
MAIN ( E ) P. C. B. MAIN ( F ) P. C. B.
SPEAKER SPEAKER
(MIDRANGE) (TWEETER)
+ + BASS
WH
BE
2.2µ
5
TO : MAIN ( A )
POWER
BL
RE
RE
TO
L SUB Wo. TO : MAIN ( A )
6 7
6
6
5
4
3
2
1
8
A
YST-MS50 (M)
RE
+
SPEAKER
(TWEETER)
2.2µ
(POWER)
+
B
SPEAKER
(MIDRANGE)
BL
RE
w Satellite Speaker (R ch)
MAIN ( C ) P. C. B.
R
(HEADPHONE)
C
INPUT1
s PRINTED CIRCUIT BOARD (Component side)
VOLUME
INPUT2
q
TO : MAIN ( D )
8 7 6
Q2
Q1
TO
IC3
5 4 3
2 1 SUB Wo.
MAIN ( D ) P. C. B.
Ref. No.
FROM : MAIN ( C )
B2
B2
B2
Location
D
Semiconductor Location
9
Rch SATELLITE SPEAKER VOLUME +12
JK1
JK4 IL 5 7
IR
INPUT 1
IC3
E
VR1 (NJM4556AL) (HEADPHONE)
JK3 3 1 Lch SATELLITE SPEAKER
INPUT 2
Q2 Q1 OL OR +
12 PWS RSP TWEETER
+
TWEETER
+12 12
1 2 PJ2
G
+12 TO E 3 5 TO +
4
SUB Wo. 6 7 8 SUB Wo.
MIDRENGE MIDRENGE
SW1 +
JK2
s BLOCK DIAGRAM
OFF ON RSP+
(POWER)
+B
PJ1 5
F
TO LEFT LSP+ 8
SPEAKER
RSP+ 9 18
Mute
Q3 PWS1 14
PWS
EQ Amp Power Amp.
+12 12 IC1,2 IC6 SP+
IC1 (NJM4558D) 12
(STK408-040E) 1 A. N. I. C
OL 5 7 SLI
Q8
+12 12 H. P. F SUBWOOFER
RSP JK5
12dB/oct 6 IC7 1
SP
1 2 +12 12 +12 12
G IC1
TO RIGHT E 3 4 5 OR 3 1 SRI 16 IC7
7 2
SPEAKER 6 7 8 (NJM4558D)
H. P. F
20
12dB/oct VR2
+12 12 +12 12
IC2 IC2
RSP+
G
6 7 3 1 SWI 17
Q6 Q7
3 +12 12
6dB/oct BASS 12dB/oct Q4 Q5
B
POWER
POWER TRANSFORMER
SW2
F1
+B
Rectifier
D2 Regulator
IC4
+ IN OUT
~ GND +12
IN OUT
~ 12
GND
IC5
H
B
A B C D E F G H I J K
YST-MS50 (M)
s SCHEMATIC DIAGRAM PIN CONNECTION DIAGRAM OF TRAN-
SISTORS, DIODES AND ICS.
1
1SS133 NJM4556AL
Anode
2.2µ
INPUT 2 SATELLITE +
8
TWEETER Cathode
L ch