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SUBWOOFER SYSTEM
YST-SW012 SERVICE MANUAL
IMPORTANT NOTICE
This manual has been provided for the use of authorized YAMAHA
YST-SW012
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.
I CONTENTS
TO SERVICE PERSONNEL .......................................... 2 BLOCK DIAGRAM ......................................................... 8
SPECIFICATIONS .......................................................... 3 PRINTED CIRCUIT BOARD .......................................... 9
INTERNAL VIEW ........................................................... 4 SCHEMATIC DIAGRAM .............................................. 10
REAR PANELS .......................................................... 5~6 PARTS LIST ........................................................... 11~15
DISASSEMBLY PROCEDURES 7~8
100994 2005 All rights reserved.
This manual is copyrighted by YAMAHA and may not be copied or
redistributed either in print or electronically without permission.
P.O.Box 1, Hamamatsu, Japan
'05.12
YST-SW012
AC LEAKAGE
I TO SERVICE PERSONNEL WALL EQUIPMENT TESTER OR
OUTLET UNDER TEST EQUIVALENT
1. Critical Components Information
Components having special characteristics are marked s
and must be replaced with parts having specifications equal
to those originally installed.
2. Leakage Current Measurement (For 120V Models Only) INSULATING
When service has been completed, it is imperative to verify TABLE
that all exposed conductive surfaces are properly insulated
from supply circuits.
G Meter impedance should be equivalent to 1500 ohms shunted G Leakage current must not exceed 0.5mA.
by 0.15µF. G 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 1.6A,
125V FUSE."
CAUTION
YST-SW012
F1: REPLACE WITH SAME TYPE 1.6A, 125V FUSE.
ATTENTION
F1: UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 1.6A, 125V.
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.
About Lead Free Solder
The P.C.B.s installed in this unit are soldered using the following solder.
Side A Side B
MAIN P.C.B. Lead Free Solder
Side A SMT REFLOW Process
Solder Dip
Side B MI FLOW Process
Among some types of lead free solder currently available, it is recommended to use one of the following types for the repair
work.
· Sn + Ag + Cu (tin + silver + copper)
· Sn + Cu (tin + copper)
· Sn + Zn + Bi (tin + zinc + bismuth)
1. As the melting point temperature of the lead free solder is about 30°C to 40°C (50°F to 70°F) higher than that of the lead solder, be sure
to use a soldering iron suitable to each solder.
2. If lead solder must be used, be sure to remove lead free solder from each terminal section of the parts to be replaced and from the area
around it completely before soldering, or make sure that the lead free solder and lead solder melt together fully.
2
YST-SW012
I SPECIFICATIONS
Type .................. Advanced Yamaha Active Servo Technology II Accessories
Output Power ..................... 50 W (100 Hz, 5 ohms 10% T.H.D) Nonskid pad x 4, Subwoofer Cable (5m) x 1
Input Sensitivity ......................... 50 mV (50 Hz, 50 W / 5 ohms)
* Specifications are subject to change without notice due to
Dynamic Power .................................................. 100 W, 5 ohms
product improvements.
Input Impedance ....................................................... 12 k-ohms
Frequency Response ....................................... 28 Hz to 200 Hz U .......... U.S.A. model C ...... Canadian model
Driver ............................................... 20cm (7-7/8") Cone Woofer R .......... General model T ....... Chinese model
Magnetic Shielding Type K .......... Korean model A ...... Australian model
Input Section B .......... British model G ...... European model
INPUT ......................................................................... RCA Pin jack L .......... Singapore model
Operation Section
Power Switch, Volume Control, LED indicator
Power Supply
YST-SW012
U, C models .................................................... AC 120 V, 60 Hz Advanced YST II
R, T, K, L models ............. AC 110-120 / 220-240 V, 50 / 60 Hz This subwoofer system employs
A model ........................................................... AC 240 V, 50 Hz Advanced Yamaha Active Servo
B, G models .................................................... AC 230 V, 50 Hz
Technology II which Yamaha has
Power Consumption ......................................................... 45 W
developed for reproducing higher
Dimensions (W x H x D) ......................... 290 x 290 x 327.5 mm quality super-bass sound.
(11-7/16" x 11-7/16" x 12-7/8")
This super bass sound adds a more
Weight ....................................................... 8.5 kg (18 lbs. 11 oz.)
realistic, theater-in-the-home effect
Finish to your stereo system.
Silver color ............................. U, C, R, T, K, A, B, G, L models
Black color ................................... U, C, R, T, A, B, G, L models
Cherry color ...................................... R, T, K, A, B, G, L models
· DIMENSIONS
327.5 (12-7/8")
290 (11-7/16") 25 290 (11-7/16") 12.5
(1") (1/2")
290 (11-7/16")
Unit: mm (inch)
3
YST-SW012
I INTERNAL VIEW
1 2 1 MAIN (1) P.C.B.
2 MAIN (3) P.C.B.
3 MAIN (5) P.C.B. (U, C, A, B, G models)
MAIN (4) P.C.B. (R, T, K, L models)
4 MAIN (2) P.C.B.
5 MAIN (9) P.C.B. (R, T, K, L models)
6 Power Transformer
7 MAIN (7) P.C.B. (U, C, A, B, G models)
MAIN (10) P.C.B. (R, T, K, L models)
YST-SW012
7 6 5 4 3
4
YST-SW012
I REAR PANELS
U, C models R model
Power Indicator Power Indicator
YST-SW012
T model K model
Power Indicator Power Indicator
5
YST-SW012
A model B, G models
Power Indicator Power Indicator
YST-SW012
L model
Power Indicator
6
YST-SW012
I DISASSEMBLY PROCEDURES
(Remove parts in the order as numbered.)
Disconnect the power cable from the AC outlet.
1. Removal of Front Grille Ass'y 2. Removal of Driver
* The Front Grille Ass'y is fixed to the cabinet with dowels at 5 a. Remove 4 screws (1) and remove the Driver. (Fig.1)
locations. b. Disconnect the connector connected to the terminal of the
As a flatblade screwdriver is used for removal, use special Driver. (Fig. 1)
care not to cause damage to the Cabinet Ass'y.
3. Removal of Rear Panel Ass'y
a. Using the flatblade screwdriver inserted in the gap between
the Front Grille Ass'y and the Cabinet Ass'y (bottom side first), a. Remove 8 screws (2) and remove the Rear Panel Ass'y.
push up the Front Grille Ass'y. (Fig.1) (Fig.1)
b. Remove the Front Grille Ass'y by lifting a metalblade up. * Screws (2) are identified with arrow marks ( ).
(Fig.1)
* When installing the Front Grille Ass'y, apply quick-drying bond
YST-SW012
or the like to dowels and then fit them into dowel holes for
secure installation. (The Front Grille Ass'y will come off easily
if its dowels are fitted into dowel holes without applying quick-
drying bond or the like.)
2
Cabinet Ass'y
2
Driver
Front Grille Ass'y
Rear Panel Ass'y
1
Connector
Dowel
Metalblade
Flatblade screwdriver
Dowel
Fig. 1
7
YST-SW012
When Checking the P.C.B..
· Connect all the connectors removed during disassembly back to the original positions.
· Spread the Rubber Sheet and Cloth for insulation purpose and place the Rear Panel Ass'y on the Rubber Sheet and Cloth. (Fig. 2)
Rubber Sheet and Cloth
YST-SW012
Fig. 2
I BLOCK DIAGRAM
VR1
VOLUME POWER
INPUT IC4A
3 - AMP
IC5A
2 4 IC5B +B RY1 DRIVER
4 + + 2 6 +
8 2 9
PJ1 - - 10
-
1 IC1
+
8
L.P.F. H.P.F. -B
12dB/oct 12dB/oct
L.P.F. A.N.I.C
6dB/oct
IC6
R28
0.1
LIMITER
Q5, 6
+B
D4, 5, 22, 23
F1 PROTECTION
T1
Q9, D2 +15
Q17- 20
POWER POWER D7, 25
SW5 SUPPLY REGULATOR
D1
Q10, D3
-15
-B
8
A B C D E F G H I J
YST-SW012
MAIN (1) P.C.B. (Side A)
1
I PRINTED CIRCUIT BOARD Lead Free Solder Used
MAIN (3) P.C.B. (Side A)
SP- 10 1
DRIVER
SP+
0
VOLUME
1
10
2
WH
RE
9 1 · Semiconductor Location RE
INPUT BL
Ref. no. Location Ref. no. Location Ref. no. Location
D1 J2 D24 J3 Q5 G3
RE
D2 H4 D25 F3 Q6 G3
D3 I4 D28 I3 Q9 H4
D4 H2 D29 I3 Q10 I4
D5 H2 IC1 H2 Q17 F3
3 D6 G2 IC4 B3 Q18 F3
9
D7 F2 IC5 B2 Q19 F3
D8 C3 IC6 G3 Q20 F3 9 1
POWER D22 G2 Q1 F3
-V
-15 INDICATOR D23 G2 Q2 F3
+15
E
MAIN Circuit No. U, C, T, R, A, L K, B, G
C78 X O
J42 X O
L1 X O
-V
-15
+15
E
MAIN
4
MAIN (7) P.C.B. (Side A)
U, C, A, B, G models RE
MAIN (5) P.C.B. (Side A) MAIN (2) P.C.B. (Side A) BE
WH
U, C, A, B, G models
WH
BL
WH BE
5
R, T, K, L models
POWER RE
ON OFF
RE BE YE
220V-240V
WH BE
RE
6 BE
BE BR
BE
SELECTOR
VOLTAGE
BR
BL
RE
YE
110V-120V
RE
AC IN
WH
7 MAIN (9) P.C.B. MAIN (10) P.C.B.
(Side A) R, T, K, L models (Side A) R, T, K, L models
9
A B C D E F G H I J
YST-SW012
1
I SCHEMATIC DIAGRAM
MAIN (3) MAIN (1)
POWER AMP
L.P.F.
14.5
1.1
0.2
0.2
0
-34.9
-35.2
35.1
0
0
INPUT
0
1.7
-1.1
0 0
0 0 35.1
-14.6
14.5
35.0
35.0
LIMITER -8.1
0
2
-14.6
0 0
0 0 14.5
0.2 0.2
0
0.2
0
0
0.2 0.2 0.2 0 0 0
0.2
L.P.F.
0.2 0 0 0
H.P.F. DRIVER
VOLUME
0 -1.9
23.6
0.8
1.3
-14.5
A.N.I.C 14.5
0
3 1.3
1.3 0
0 0
1.3 0 0
0
0.1 0
0.7
-8.0 0 0.7
0 0
0
PROTECTION
-30.7 35.0
MAIN (10) 29.4 29.4 15.0
4 14.5
REGULATOR
-14.5
AC 52.0 -15.1
-29.6 -29.5
MAIN (7) U, C, A, B, G models POWER
-35.2
MAIN (5) SUPPLY
5 POWER
MAIN (2)
MAIN (9)
6 IC1: STK404-070 60W IC4~6: µPC4570HA-A
AF Power Amp Dual OP-Amp
TR7
R, T, K, L models
R1 TR6
R4
1 2
- + + -
TR1 TR2 R5
TR8
C2 1 2 3 4 5 6 7 8 9
C1
Vcc Vo1 -Vm1 +Vm1 VEE +Vm2 -Vm2 Vo2 Vcc
R2
TR5
D1
R3 R6
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS. TR3 TR4
2SA970 2SB1642 RBV-402 1SR139,400 STK404-070 60W µPC4570HA-A
2SC2240 2SD2531 1SS133,176 SUB
2SC2878 MTZJ15C 1 2 3 4 5 6 7 8 9 10
MTZJ24B Anode
MTZJ5.6B
7 9 # All voltages are measured with a 10MV DC electronic volt meter.
10 # Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
E BC
CB
E + Cathode 1 1 # Schematic diagram is subject to change without notice.
10
YST-SW012
PARTS LIST
I ELECTRICAL PARTS
I WARNING
G Components having special characteristics are marked s and must be replaced with parts having specifications equal to
those originally installed.
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
YST-SW012
C.CE.SMI : SEMI CONDUCTIVE CERAMIC CAP PLST.RIVET