Yamaha YSTMS50B User manual

SERVICE MANUAL
■ CONTENTS
TO SERVICE PERSONNEL . . . . . . . . . . . . . . . . . . . .1
FRONT AND REAR PANELS . . . . . . . . . . . . . . . 1 – 2
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
INTERNAL VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
DISASSEMBLY PROCEDURES . . . . . . . . . . . . . . . . . 5
100778
SERVICE MANUAL
YST-MS50(M)
POWERED MULTIMEDIA SPEAKERS
PRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . . 6 – 8
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . .10
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 – 15
PARTS LIST FOR CARBON RESISTORS . . . . . . . . 16
The contents of this Service Manual are applicable to the products with serial numbers of Z200001 and up.
YST-MS50
(M)
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
unit.
IMPORTANT NOTICE
BASS
0
10
SPEAKERS
MULTIMEDIA
POWERED
YST-MS50
POWEREDMULTIMEDIA SPEAKERS
VOLUME

YST-MS50(M)
YST-MS50
(M)
■TO SERVICE PERSONNEL
1. Critical Components Information
Components having special characteristics are marked Z
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
from supply circuits.
●Meter impedance should be equivalent to 1500 ohm shunted
by 0.15µF.
AC LEAKAGE
TESTER OR
EQUIVALENT
EQUIPMENT
UNDER TEST
INSULATING
TABLE
WALL
OUTLET
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.
1
■FRONT AND REAR PANELS
●Leakage current must not exceed 0.5mA.
●Be sure to test for leakage with the AC plug in both
polarities.
▼ Satellite Speakers Front Panel ▼ Satellite Speakers Rear Panel
Lch Rch Lch Rch
“CAUTION”
“F1 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 2.0A, 250V FUSE.”
CAUTION
F1 : REPLACE WITH SAME TYPE 2.0A, 250V FUSE.
ATTENTION
F1 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 2.0A, 250V.
AV

YST-MS50(M)
YST-MS50
(M)
▼ Subwoofer Front Panel
2
▼ Subwoofer Rear Panel
U and C models
A modelB and G models

YST-MS50(M)
YST-MS50
(M)
■SPECIFICATIONS
Type ................................. Advanced Active Servo Technology
Output Power
Satellite................. 20W+20W (1kHz, 4 ohms at T.H.D.=10%)
Subwoofer ................... 40W (100Hz, 5 ohms at T.H.D.=10%)
Input Sensitivity ......................200mV (1kHz, 4 ohms at 20W)
Input Impedance ....................................................... 25 kohms
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
Subwoofer................................................. 16cm (6-1/2") cone
Magnetic shielding type
Power Consumption ........................................................ 65 W
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)
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
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
8 pcs of nonskid pad x 1set
* Specifications subject to change without notice.
● Satellite Speaker
U . . . . . . . . . . . . . USA model
C . . . . . . . . . Canadian model
A . . . . . . . . Australian model
B . . . . . . . . . . . British model
G . . . . . . . . .European model
3
Unit : mm (inch)
● DIMENSIONS
97 (3-13/16")
178 (7")
166(6-17/32")
159 (6-1/4")
● Subwoofer
210 (8-1/4") 321 (12-5/8")
350 (13-3/4")

YST-MS50(M)
YST-MS50
(M)
■INTERNAL VIEW
4
▼ Satellite Speakers
▼ Subwoofer
w
qe
r
y u
t
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)
qMAIN (B) P.C.B.
Satellite Speaker (R ch)
wMAIN (C) P.C.B.
eMAIN (D) P.C.B.
Lch Rch
Subwoofer
rMAIN (E) P.C.B.
tMAIN (A) P.C.B.
ySPEAKER UNIT
(Subwoofer)
uMAIN (F) P.C.B.

YST-MS50(M)
YST-MS50
(M)
■DISASSEMBLY PROCEDURES
(Remove parts in the order as numbered.)
Fig. 2
Fig. 1
●Disassemble of the Subwoofer
1. Removal of the Rear Panel Ass’y.
a. Remove 8 screws ( q) in Fig. 1, and remove the
rear panel ass’y.
* Arrow marks ( ) are printed to identify the screws to be
removed.
b. Disconnect one connector in Fig. 1.
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.
(Front panel ass’y can not to remove completely.)
3. Removal of the Speaker
a. Set up the front panel ass’y in the direction of the
arrow, in Fig. 2.
b. Remove 4 screws ( w) in Fig. 2, and remove the
speaker.
Dowels Front Panel Ass’y
Cabinet
Connector
Gaps
Speaker Cord
Rear Panel Ass’y
Speaker
Front Panel Ass’y
q
w
5

ABCDEFGH
1
2
3
4
5
6
YST-MS50(M)
6 7
MAIN ( A ) P. C.B. TO : SPEAKER (WOOFER)
FROM :POWER CORD
WH
BE
FROM :MAIN ( F )
FROM :MAIN ( E )
TO RIGHT
SPEAKER
TO LEFT
SPEAKER
RE WH
WH: U, C
BE: A, B, G
BL: U, C
BR: A, B, G
MAIN ( E ) P. C.B.
BASS
TO : MAIN ( A )
MAIN ( F ) P. C.B.
POWER
WH BE
TO : MAIN ( A )
MAIN ( B ) P. C.B.
TO
SUB Wo.
L
+– + –
2.2µ
SPEAKER
(MIDRANGE) SPEAKER (TWEETER)
BL
RE RE
■PRINTED CIRCUIT BOARD (Component side)
▼ Satellite Speaker (L ch)
▼ Subwoofer Ref. No. Location
D2 B2
D3 F3
D4 F2
D5 E2
D6 E3
D7 E3
D8 E3
Ref. No. Location
IC1 F2
IC2 E3
IC4 C2
IC5 C2
IC6 E2
IC7 E3
● Semiconductor Location
Ref. No. Location
Q3 F3
Q4 F2
Q5 E2
Q6 F2
Q7 E2
Q8 E2

ABCDEFGH
1
2
3
4
5
6
YST-MS50(M)
■BLOCK DIAGRAM
8 9
MAIN ( C ) P. C.B.
TO : MAIN ( D )
VOLUME
(HEADPHONE)
(POWER)
21
7
5
8
43
6
MAIN ( D ) P. C.B.
TO SUB Wo. INPUT2 INPUT1
R
+–
+
–
2.2µ
SPEAKER
(MIDRANGE)
SPEAKER
(TWEETER)
RE
BL
RE
FROM :MAIN ( C )
Q2
Q3
Q8
SW1
POWER
SW2
F1
D2 IC4
GND
IN
+
–
OUT
IC5
GND
IN OUT
~
POWER
TRANSFORMER
Regulator
(POWER)
Q1
3
5
VOLUME
VR1
VR2
IR
JK4
INPUT 1
INPUT 2
JK3
Rch SATELLITE SPEAKER
Lch SATELLITE SPEAKER
IL
31G
4
76
JK2
8
25
+12
+12
+12
PWS
TO
SUBWo.
TO LEFT
SPEAKER
TO RIGHT
SPEAKER
OL
1
7
IC3
(NJM4556AL)
OR RSP–
RSP+
TWEETER
MIDRENGE
+
+
JK1
(HEADPHONE)
–
–
TWEETER
MIDRENGE
+
+
–
–
SUBWOOFER
SP+
SP–
E
–12
31G
4768
25
+12
E
OL
PWS
OR
RSP–
RSP+
JK5 –12
–12
3
5
–12
–12
+12
+12
1
7
H. P. F
12dB/oct
H. P. F
12dB/oct
–12
+12
–6dB/oct
–12
+12
–12dB/oct
EQ Amp
IC1,2
(NJM4558D)
Mute
Power Amp.
IC6
(STK408-040E)
IC1
IC2 IC2
IC1
IC7
IC7
(NJM4558D)
+12 –12
27
20
1
18
+12
16
–12
6
+12
7
–12
317
SWI
SRI
SLI
PWS1
RSP+
LSP+
PJ1
TO
SUB Wo.
PJ2
16
12
14
9
85
3
1
+B
–B
–B
+B
BASS
Rectifier
Q6 Q7
Q5Q4
~
A. N. I. C
ON
OFF
■PRINTED CIRCUIT BOARD (Component side)
▼ Satellite Speaker (R ch)
Ref. No. Location
IC3 B2
Q1 B2
Q2 B2
● Semiconductor Location

ABCDEFGH
1
2
3
4
5
6
IJK
7
8
YST-MS50(M)
■SCHEMATIC DIAGRAM
* All voltage are measured with a 10MΩ/V DC electric volt meter.
* Components having special characteristics are marked Zand
must be replaced with parts having specifications equal to those
originally installed.
* Schematic diagram is subject to change without notice.
10
IC1, 2, 7 : NJM4558D
Dual OP-Amp
IC3 : NJM4556AL
Dual OP-Amp
–IN1
2
+IN1
3
–VCC
4
+IN2
5
–IN2
6
OUT2
7
+VCC
8
OUT1
1
–
+
–
+
IC6 : STK408-040E
3 Channels AF Power Amp
2019181716151413121110987654321
THERMAL
SENSOR
SUB CH.1–
+CH.3
–
+
–
+
CH.2
SUB GND
N. C.
CH.2 –VCC CH.1 –VCC
CH.1,2,3 +VCC
CH.1 OUT CH.2 OUT
PRE –VCC
PRE +VCC
CH.1 IN
CH.1 NF
C. C. C. BIAS
CH.2 NF
CH.2 IN
CH.3 NF
CH.3 IN
CH.2 –VCC
CH.3 OUT
LIMITER
A.N.I.C
POWER AMP
LPF
HPF
PHONE AMP
POWER SUPPLY
0
0
0
00
0
11.7
00
0
-11.5
0
0
0
11.4
11.7 11.4
10.4
00
0
11.7
00
0
-11.5
0
0
0
-11.5
0
0
0
11.7
0
-27.1
-0.2 -0.2 -0.1 -0.1
-24.3
-0.1 -0.1
25.6
-25.5
0 0
27.1 -27.1 -27.1
0
0
0
00
0
00
0
0
0
0
00
11.7
-11.5
-1.5 0
0
0
0
0
00
00
0
0.2
-11.5
0.2 0
11.7
11.7
0
27.1
-11.5
0
-27.1
-27.1
AC43.2 27.1
+
–
+
–
SATELLITE
MIDRANGE
L ch
SATELLITE
TWEETER
L ch
2.2µ
+
–
+
–
SATELLITE
MIDRANGE
R ch
SATELLITE
TWEETER
R ch
2.2µ
RE
BL
TO
SUB Wo.
(HEADPHONE)
TO RIGHT
SPEAKER
TO LEFT
SPEAKER
MAIN (C)
VOLUME
(POWER)
INPUT 2
INPUT 1
WOOFER
+
–
MAIN ( D )
RE
BL
MAIN ( B )
TO
SUB Wo.
MAIN ( F )
POWER MAIN ( E )
BASS
MAIN ( A )
WH
RE
BE
WH
BL
WH BR
BE
ONOFF
NJM4556AL
NJM4558D
1SS133
Anode
Cathode
B
C
E
2SA1015 (O, Y)
2SC1815 (Y, GR)
2SC2878 (A, B)
RBV-402
D
GS
NJM78M12FA
STK408-040E
PIN CONNECTION DIAGRAM OFTRAN-
SISTORS, DIODES AND ICS.
+
–
2SK304 (E)
1
20
1: OUTPUT
2: COMMON
3: INPUT 321
NJM79M12FA
1:COMMON
2:INPUT
3:OUTPUT
321
1
4
8
1
8
–+
OUT 1
–IN 1
–V CC
+V CC
OUT 2
1
2
3
45
+IN 1 –IN 2
+IN 2
–+
6
7
8

YST-MS50(M)
YST-MS50
(M)
11
ABBREVIATIONS IN THIS LIST ARE AS FOLLOWS :
C.A.EL.CHP : CHIP ALUMI. ELECTROLYTIC CAP
C.CE : CERAMIC CAP
C.CE.ARRAY : CERAMIC CAP ARRAY
C.CE.CHP : CHIP CERAMIC CAP
C.CE.ML : MULTILAYER CERAMIC CAP
C.CE.M.CHP : CHIP MULTILAYER CERAMIC CAP
C.CE.SAFTY : RECOGNIZED CERAMIC CAP
C.CE.TUBLR : CERAMIC TUBULAR CAP
C.CE.SMI : SEMI CONDUCTIVE CERAMIC CAP
C.EL : ELECTROLYTIC CAP
C.MICA : MICA CAP
C.ML.FLM : MULTILAYER FILM CAP
C.MP : METALLIZED PAPER CAP
C.MYLAR : MYLAR FILM CAP
C.MYLAR.ML : MULTILAYER MYLAR FILM CAP
C.PAPER : PAPER CAPACITOR
C.PLS : POLYSTYRENE FILM CAP
C.POL : POLYESTER FILM CAP
C.POLY : POLYETHYLENE FILM CAP
C.PP : POLYPROPYLENE FILM CAP
C.TNTL : TANTALUM CAP
C.TNTL.CHP : CHIP TANTALUM CAP
C.TRIM : TRIMMER CAP
CN : CONNECTOR
CN.BS.PIN : CONNECTOR, BASE PIN
CN.CANNON : CONNECTOR, CANNON
CN.DIN : CONNECTOR, DIN
CN.FLAT : CONNECTOR, FLAT CABLE
CN.POST : CONNECTOR, BASE POST
COIL.MX.AM : COIL, AM MIX
COIL.AT.FM : COIL, FM ANTENNA
COIL.DT.FM : COIL, FM DETECT
COIL.MX.FM : COIL, FM MIX
COIL.OUTPT : OUTPUT COIL
DIOD.ARRAY : DIODE ARRAY
DIODE.BRG : DIODE BRIDGE
DIODE.CHP : CHIP DIODE
DIODE.VAR : VARACTOR DIODE
DIOD.Z.CHP : CHIP ZENER DIODE
DIODE.ZENR : ZENER DIODE
DSCR.CE : CERAMIC DISCRIMINATOR
FER.BEAD : FERRITE BEADS
FER.CORE : FERRITE CORE
FET.CHP : CHIP FET
FL.DSPLY : FLUORESCENT DISPLAY
FLTR.CE : CERAMIC FILTER
FLTR.COMB : COMB FILTER MODULE
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
Note) Those parts marked with “#” are not included in the P.C.B. ass'y.
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 POINT
PLST.RIVET : PLASTIC RIVET
R.ARRAY : RESISTOR ARRAY
R.CAR : CARBON RESISTOR
R.CAR.CHP : CHIP RESISTOR
R.CAR.FP : FLAME PROOF CARBON RESISTOR
R.FUS : FUSABLE RESISTOR
R.MTL.CHP : CHIP METAL FILM RESISTOR
R.MTL.FLM : METAL FILM RESISTOR
R.MTL.OXD : METAL OXIDE FILM RESISTOR
R.MTL.PLAT : METAL PLATE RESISTOR
RSNR.CE : CERAMIC RESONATOR
RSNR.CRYS : CRYSTAL RESONATOR
R.TW.CEM : TWIN CEMENT FIXED RESISTOR
R.WW : WIRE WOUND RESISTOR
SCR.BND.HD : BIND HEAD B-TITE SCREW
SCR.BW.HD : BW HEAD TAPPING SCREW
SCR.CUP : CUP TITE SCREW
SCR.TERM : SCREW TERMINAL
SCR.TR : SCREW, TRANSISTOR
SUPRT.PCB : SUPPORT, P.C.B.
SURG.PRTCT : SURGE PROTECTOR
SW.TACT : TACT SWITCH
SW.LEAF : LEAF SWITCH
SW.LEVER : LEVER SWITCH
SW.MICRO : MICRO SWITCH
SW.PUSH : PUSH SWITCH
SW.RT.ENC : ROTARY ENCODER
SW.RT.MTR : ROTARY SWITCH WITH MOTOR
SW.RT : ROTARY SWITCH
SW.SLIDE : SLIDE SWITCH
TERM.SP : SPEAKER TERMINAL
TERM.WRAP : WRAPPING TERMINAL
THRMST.CHP : CHIP THERMISTOR
TR.CHP : CHIP TRANSISTOR
TR.DGT : DIGITAL TRANSISTOR
TR.DGT.CHP : CHIP DIGITAL TRANSISTOR
TRANS : TRANSFORMER
TRANS.PULS : PULSE TRANSFORMER
TRANS.PWR : POWER TRANSFORMER ASS’y
TUNER.AM : TUNER PACK, AM
TUNER.FM : TUNER PACK, FM
TUNER.PK : FRONT-END TUNER PACK
VR : ROTARY POTENTIOMETER
VR.MTR : POTENTIOMETER WITH MOTOR
VR.SW : POTENTIOMETER WITH ROTARY SW
VR.SLIDE : SLIDE POTENTIOMETER
VR.TRIM : TRIMMER POTENTIOMETER
■ELECTRICAL PARTS
PARTS LIST ■ WARNING
Components having special characteristics are marked Zand 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
List. For the parts No. of the carbon resistors, refer to last page.

YST-MS50(M)
YST-MS50
(M)
12
P.C.B. MAIN
Schm
Ref. PART NO. Description Remarks
New Parts
*
Schm
Ref. PART NO. Description Remarks
New Parts
*
* AAX31030 P.C.B. MAIN(UC) 353086
* AAX31040 P.C.B. MAIN(ABG) 353090
CB1 VB858700 CN.BS.PIN 8P
CB4 VD004600 CN.BS.PIN 3P
CB5 VP206500 HOLDER.FUS EYF‑52BC
CB6 VP206500 HOLDER.FUS EYF‑52BC
C1 VJ836900 C.EL 10uF16V
C2 VV020100 C.EL 220uF10V
C3 FG211470 C.CE 47pF50V
C4 VJ836900 C.EL 10uF16V
C5 VV020100 C.EL 220uF10V
C6 FG211470 C.CE 47pF50V
C7 VJ836900 C.EL 10uF16V
C8 VJ836900 C.EL 10uF16V
ZC9 VS741700 C.CE.SAFTY 0.01uF275V
C10 VF964800 C.EL 100uF16V
C11 UA654330 C.MYLAR 0.033uF50V
C12 UA654330 C.MYLAR 0.033uF50V
C13 VJ836900 C.EL 10uF16V
C14 UA654330 C.MYLAR 0.033uF50V
C15 UA654330 C.MYLAR 0.033uF50V
C16 VJ836900 C.EL 10uF16V
C17 UR759470 C.EL 4700uF35V
C18 UR857470 C.EL 47uF35V
C19 UR759470 C.EL 4700uF35V
C20 UR857470 C.EL 47uF35V
C21 FG212470 C.CE 470pF50V
C22 FG212470 C.CE 470pF50V
C23 UA655100 C.MYLAR 0.1uF50V
C24 VJ836900 C.EL 10uF16V
C25 UR866220 C.EL 2.2uF50V
C26 UR867100 C.EL 10uF50V
C27 UR866220 C.EL 2.2uF50V
C28 VJ836900 C.EL 10uF16V
C29 UR867100 C.EL 10uF50V
C30 UA655100 C.MYLAR 0.1uF50V
C31 UM397330 C.EL 33uF16V
C32 UA655150 C.MYLAR 0.15uF50V
C33 UA655390 C.MYLAR 0.39uF50V
C34 UJ668100 C.EL 100uF50V
C35 UJ668100 C.EL 100uF50V
C36 UM397330 C.EL 33uF16V
C37 FG211150 C.CE 15pF50V
C38 FG211150 C.CE 15pF50V
C39 UA655100 C.MYLAR 0.1uF50V
C40 VJ837200 C.EL 47uF16V
C41 VJ837200 C.EL 47uF16V
C42 UM397330 C.EL 33uF16V
C43 UA653390 C.MYLAR 3900pF50V
C44 UA655180 C.MYLAR 0.18uF50V
C45 UA653470 C.MYLAR 4700pF50V
C46 VD916400 C.EL 2.2uF50V
C47 VD916400 C.EL 2.2uF50V
C48 UA654470 C.MYLAR 0.047uF50V
C49 UA654470 C.MYLAR 0.047uF50V
C50 FG214100 C.CE 0.01uF50V
C51 FG214100 C.CE 0.01uF50V
C52 UA653100 C.MYLAR 1000pF50V
C53 UA653100 C.MYLAR 1000pF50V
C54 VJ839100 C.EL 1uF50V
C55 VJ839100 C.EL 1uF50V
C56 UA655100 C.MYLAR 0.1uF50V
C57 UA655100 C.MYLAR 0.1uF50V
C58 UA655470 C.MYLAR 0.47uF50V
C59 UA655100 C.MYLAR 0.1uF50V
C60 VJ836900 C.EL 10uF16V
C61 VJ836900 C.EL 10uF16V
D1 VY660300 LED(gr) SLP‑277B‑51
ZD2 VC971500 DIODE.BRG RBV‑4024.0A200V 069612
D3 iF004600 DIODE 1SS133
D4 iF004600 DIODE 1SS133
D5 iF004600 DIODE 1SS133
D6 iF004600 DIODE 1SS133
D7 iF004600 DIODE 1SS133
D8 iF004600 DIODE 1SS133
ZF1 KB000660 FUSE 400mA250V(ABG)
ZF1 VT951300 FUSE 2A250V(UC)
IC1 XN324A00 IC NJM4558DV
IC2 XN324A00 IC NJM4558DV
IC3 XP844A00 IC NJM4556AL
IC4 XJ602A00 IC NJM78M12FA
IC5 XD343A00 IC NJM79M12FA
ZIC6 XV809A00 IC STK408‑040E25W
IC7 XN324A00 IC NJM4558DV
JK1 V3666400 JACK.MNI HTJ‑035‑27A
JK2 V3317500 JACK.DIN 8P
JK3 V3317400 JACK.MNI 1P
JK4 V3317400 JACK.MNI 1P
JK5 VV881000 CN.DIN
8PCMS5008‑0101
PJ1 V3407500 JACK.PIN 1P
PJ2 VU581900 JACK.PIN 1P
Q1 iC287820 TR 2SC2878A,B
Q2 iC287820 TR 2SC2878A,B
Q3 iA101590 TR 2SA1015O,Y
Q4 iC1815M0 TR 2SC1815Y,GR
Q5 iA101590 TR 2SA1015O,Y
Q6 iC1815M0 TR 2SC1815Y,GR
Q7 iA101590 TR 2SA1015O,Y
Q8 V3028000 FET 2SK304E
ZR37 HV455100 R.CAR.FP 100Ω1/4W
ZR38 HV455100 R.CAR.FP 100Ω1/4W
R39 HV453470 R.CAR.FP 4.7Ω1/4W
R46 HV453470 R.CAR.FP 4.7Ω1/4W
R55 HV456100 R.CAR.FP 1KΩ1/4W
R57 HV454820 R.CAR.FP 82Ω1/4W
R58 HV453470 R.CAR.FP 4.7Ω1/4W

YST-MS50(M)
YST-MS50
(M)
13
P.C.B. MAIN
Schm
Ref. PART NO. Description Remarks
New Parts
*
Schm
Ref. PART NO. Description Remarks
New Parts
*
R59 VE869300 R.MTL.OXD 0.12W
ZR60 HV453100 R.CAR.FP 1Ω1/4W
ZR61 HV453100 R.CAR.FP 1Ω1/4W
SW1 VS066500 SW.PUSH SPPH13‑W
Z* SW2 V8377400 SW.POWER SY16‑52‑4 354986
VR1 V2261700 VR A50KΩ
VR2 VZ496100 VR A5KΩ
BB070700 GND.MTL
V4097600 HOLDER.LED LH‑5‑14
Ei030086 SCR.BND.HD 3x8MFZN2Y
Ei330166 SCR.BND.HD 3x16MFC2BL

ABCDE
1
2
3
4
5
6
7
YST-MS50(M)
■EXPLODED VIEW
14
6-3
6-3-1
(E)
5-1 8
202 x 1
204 x 1
201 x 1 203 x 1
6-12
6-4
6-6
1
5-6
302
301
5-7
5-33
5-31
5-8
5-20
5-12
5-17
5-17
5-1
5-14 5-31
5-15
5-15
5-16
5-16
5-32
5-34
5-11
6-12
5-5
5-1
6-1
6-2
6-11
2
20 20
(A)
(F)

Ref.
No. PARTNO. Description Remarks Markets
New Parts
*
YST-MS50(M)
YST-MS50
(M)
■MECHANICAL PARTS
15
* 1 AAX31070 CABINETASS'Y WH 353458
* 1 AAX31060 CABINETASS'Y BL 353457
* 2 X2009A00 DRIVER,WOOFER 16cmJA1687 353214
* 5‑1 AAX31030 P.C.B.ASS'Y MAIN 353086 UC
* 5‑1 AAX31040 P.C.B.ASS'Y MAIN 353090 ABG
Z* 5‑5 X2113A00 POWERTRANSFORMER 353131 UC
Z* 5‑5 X2114A00 POWERTRANSFORMER 353132 A
Z* 5‑5 X2115A00 POWERTRANSFORMER 353133 BG
Z* 5‑6 V8366300 POWERCORD 353587 UC
Z* 5‑6 V8366500 POWERCORD 355104 A
Z* 5‑6 V8366600 POWERCORD 355105 B
Z* 5‑6 V8366400 POWERCORD 355106 G
5‑7 CB072750 CORDSTOPPER SR‑4N‑4 078569
5‑8 CB069250 BINDINGTIE BK‑1 080558
* 5‑11 AAX31170 REARPANEL 353582 UC
* 5‑11 AAX31180 REARPANEL 353583 A
* 5‑11 AAX31190 REARPANEL 353584 BG
* 5‑12 AAX31050 COVER 352528
* 5‑14 AAX31020 BUTTONPOWER 352529
5‑15 V2583100 PACKING,A 044414
5‑16 V2583200 PACKING,B 044415
* 5‑17 AAX31130 PACKING,MOLD 5x55 335431
5‑20 VZ655300 BUSH 084849
5‑31 EN335030 BINDHEADBONDINGTAP.SCREW 3x10MFC2BL 075321
5‑32 EX601360 BINDHEADP‑TITESCREW 3x10MFC2BL
5‑33 ED330086 BINDHEADSCREW 3x8MFC2BL 075573
5‑34 EK396010 BINDHEADS‑TITESCREW 4x8MFC2BL 075180
6‑1 V3370900 FRONTPANEL WH 049622
6‑1 V3371000 FRONTPANEL BL 049623
6‑2 V3374600 PORT 050337
* 6‑3 AAX31150 FRONTGRILLEASS'Y WH 353371
* 6‑3 AAX31160 FRONTGRILLEASS'Y BL 353372
6‑3‑1 V3371600 EMBLEM
6‑4 V3374700 KNOB,VOLUME WH 049656
6‑4 V3374800 KNOB,VOLUME BL 049677
6‑6 V2490000 PORTRING 044359
6‑11 EK093030 BINDHEADP‑TITESCREW 3x10MFZN2Y
6‑12 EP600280 BINDHEADP‑TITESCREW 3x8MFZN2Y 018079
8 VZ655300 BUSH 084849
20 Ei340206 BINDHEADTAPPINGSCREW 4x20MFZN2BL
ACCESSORIES
201 VS494400 CABLE,MINIPLUG 1.8m1pc 040878
202 VT309500 RCAPINCABLE 1.8m1pc 019086
203 VZ663800 DINPLUGCABLE 8P1.8m1pc 354879
204 VS104300 NONSKIDPAD 8pcs/set 011716
* 301 AAX31080 SATELLITESPEAKERUNIT LWH 351937L
* 301 AAX31100 SATELLITESPEAKERUNIT LBL 351942L
* 302 AAX31090 SATELLITESPEAKERUNIT RWH 351937R
* 302 AAX31110 SATELLITESPEAKERUNIT RBL 351942R

Parts List for Carbon Resistors
1/6W Type Part No.
HF45 7100
HF45 7110
HF85 7120
HF45 7130
HF45 7150
HF45 7180
HF45 7220
HF45 7240
HF85 7270
HF45 7300
HF45 7330
HF45 7360
HF45 7390
HF45 7470
HF45 7510
HF45 7560
HF45 7620
HF45 7680
HF45 7820
HF45 7910
HF45 8100
HF45 8110
HF45 8120
HF45 8150
HF45 8180
HF85 8220
HF45 8270
HF45 8300
HF45 8330
HF85 8390
HF45 8470
HF85 8560
HF85 8680
HF85 8820
HF45 9100
❊
HF85 9150
HF85 9180
HF85 9220
HF85 9330
❊
HF85 9470
1/4W Type Part No.
HF45 7100
HF45 7110
HJ35 7120
HF45 7130
HF45 7150
HF45 7180
HF45 7220
HF45 7240
HJ35 7270
HF45 7300
HF45 7330
HF45 7360
HF45 7390
HF45 7470
HF45 7510
HF45 7560
HF45 7620
HF45 7680
HF45 7820
HF45 7910
HF45 8100
HF45 8110
HF45 8120
HF45 8150
HF45 8180
HJ35 8220
HF45 8270
HF45 8300
HF45 8330
HJ35 8390
HF45 8470
HJ35 8560
HJ35 8680
HJ35 8820
HF45 9100
HJ35 9120
HJ35 9150
HJ35 9180
HJ35 9220
HJ35 9330
HJ35 9390
HJ35 9470
Value
10 kΩ
11 kΩ
12 kΩ
13 kΩ
15 kΩ
18 kΩ
22 kΩ
24 kΩ
27 kΩ
30 kΩ
33 kΩ
36 kΩ
39 kΩ
47 kΩ
51 kΩ
56 kΩ
62 kΩ
68 kΩ
82 kΩ
91 kΩ
100 kΩ
110 kΩ
120 kΩ
150 kΩ
180 kΩ
220 kΩ
270 kΩ
300 kΩ
330 kΩ
390 kΩ
470 kΩ
560 kΩ
680 kΩ
820 kΩ
1.0 MΩ
1.2 MΩ
1.5 MΩ
1.8 MΩ
2.2 MΩ
3.3 MΩ
3.9 MΩ
4.7 MΩ
1/6W Type Part No.
HF85 3100
❊
HF85 3220
HF85 3330
HF85 3470
HF85 3560
HF45 4100
HF85 4150
HF45 4220
HF85 4270
HF45 4330
HF85 4390
HF45 4470
HF45 4560
HF45 4680
HF45 4750
HF45 4820
HF45 4910
HF45 5100
HF85 5110
HF45 5120
HF45 5150
❊
HF45 5180
HF45 5200
HF45 5220
HF45 5270
HF45 5330
HF45 5390
HF45 5430
HF45 5470
HF45 5510
HF45 5560
HF45 5680
HF45 5820
HF45 5910
HF45 6100
HF45 6120
HF45 6150
HF45 6180
HF85 6200
HF45 6220
HF85 6240
HF45 6270
HF45 6300
HF45 6330
HF85 6360
HF45 6390
HF45 6470
HF45 6510
HF45 6560
HF45 6680
HF45 6820
HF45 6910
1/4W Type Part No.
HJ35 3100
HJ35 3180
HJ35 3220
HJ35 3330
HJ35 3470
HJ35 3560
HF45 4100
HJ35 4150
HF45 4220
HJ35 4270
HF45 4330
HJ35 4470
HF45 4470
HF45 4560
HF45 4680
HF45 4750
HF45 4820
HF45 4910
HF45 5100
HJ35 5110
HF45 5120
HF45 5150
HJ35 5160
HF45 5180
HF45 5200
HF45 5220
HF45 5270
HF45 5330
HF45 5390
HF45 5430
HF45 5470
HF45 5510
HF45 5560
HF45 5680
HF45 5820
HF45 5910
HF45 6100
HF45 6120
HF45 6150
HF45 6180
HJ35 6200
HF45 6220
HJ35 6240
HF45 6270
HF45 6300
HF45 6330
HJ35 6360
HF45 6390
HF45 6470
HF45 6510
HF45 6560
HF45 6680
HF45 6820
HF45 6910
Value
1.0 Ω
1.8 Ω
2.2 Ω
3.3 Ω
4.7 Ω
5.6 Ω
10 Ω
15 Ω
22 Ω
27 Ω
33 Ω
39 Ω
47 Ω
56 Ω
68 Ω
75 Ω
82 Ω
91 Ω
100 Ω
110 Ω
120 Ω
150 Ω
160 Ω
180 Ω
200 Ω
220 Ω
270 Ω
330 Ω
390 Ω
430 Ω
470 Ω
510 Ω
560 Ω
680 Ω
820 Ω
910 Ω
1.0 kΩ
1.2 kΩ
1.5 kΩ
1.8 kΩ
2.0 kΩ
2.2 kΩ
2.4 kΩ
2.7 kΩ
3.0 kΩ
3.3 kΩ
3.6 kΩ
3.9 kΩ
4.7 kΩ
5.1 kΩ
5.6 kΩ
6.8 kΩ
8.2 kΩ
9.1 kΩ
1992
1/4W Type
HF45
1/6W Type
HF85
1/4W Type
HJ35
10mm 5mm
YST-MS50
(M)
YST-MS50(M)
16