YAMAHA YST-SW012.pdf

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SUBWOOFER SYSTEM
YST-SW012
SERVICE MANUAL
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.
YST-SW012
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
SPECIFICATIONS .......................................................... 3
INTERNAL VIEW ........................................................... 4
REAR PANELS .......................................................... 5~6
DISASSEMBLY PROCEDURES
...............................
7~8
BLOCK DIAGRAM ......................................................... 8
PRINTED CIRCUIT BOARD .......................................... 9
SCHEMATIC DIAGRAM .............................................. 10
PARTS LIST ........................................................... 11~15
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
I
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.
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.
G
WALL
OUTLET
EQUIPMENT
UNDER TEST
AC LEAKAGE
TESTER OR
EQUIVALENT
INSULATING
TABLE
Meter impedance should be equivalent to 1500 ohms shunted
by 0.15µF.
G
G
Leakage current must not exceed 0.5mA.
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.”
YST-SW012
CAUTION
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.
MAIN P.C.B.
Side A
Side A
–
SMT
Side B
Lead Free Solder
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)
Caution:
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
Output Power
..................... 50 W (100 Hz, 5 ohms 10% T.H.D)
Input Sensitivity
......................... 50 mV (50 Hz, 50 W / 5 ohms)
Dynamic Power
.................................................. 100 W, 5 ohms
Input Impedance
....................................................... 12 k-ohms
Frequency Response
....................................... 28 Hz to 200 Hz
Driver
............................................... 20cm (7-7/8") Cone Woofer
Magnetic Shielding Type
Input Section
INPUT ......................................................................... RCA Pin jack
Operation Section
Power Switch, Volume Control, LED indicator
Power Supply
U, C models .................................................... AC 120 V, 60 Hz
R, T, K, L models ............. AC 110-120 / 220-240 V, 50 / 60 Hz
A model ........................................................... AC 240 V, 50 Hz
B, G models .................................................... AC 230 V, 50 Hz
Power Consumption
......................................................... 45 W
Dimensions
(W x H x D) ......................... 290 x 290 x 327.5 mm
(11-7/16" x 11-7/16" x 12-7/8")
Weight
....................................................... 8.5 kg (18 lbs. 11 oz.)
Finish
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
U .......... U.S.A. model
R .......... General model
K .......... Korean model
B .......... British model
L .......... Singapore model
C ...... Canadian model
T ....... Chinese model
A ...... Australian model
G ...... European model
Accessories
Nonskid pad x 4, Subwoofer Cable (5m) x 1
*
Specifications are subject to change without notice due to
product improvements.
YST-SW012
Advanced YST II
This subwoofer system employs
Advanced Yamaha Active Servo
Technology II which Yamaha has
developed for reproducing higher
quality super-bass sound.
This super bass sound adds a more
realistic, theater-in-the-home effect
to your stereo system.
• DIMENSIONS
327.5 (12-7/8")
290 (11-7/16")
25
(1")
290 (11-7/16")
12.5
(1/2")
290 (11-7/16")
Unit: mm (inch)
3
YST-SW012
I
INTERNAL VIEW
1
2
1
2
3
4
5
6
7
MAIN (1) P.C.B.
MAIN (3) P.C.B.
MAIN (5) P.C.B. (U, C, A, B, G models)
MAIN (4) P.C.B. (R, T, K, L models)
MAIN (2) P.C.B.
MAIN (9) P.C.B. (R, T, K, L models)
Power Transformer
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
Power Indicator
R model
Power Indicator
YST-SW012
T model
Power Indicator
K model
Power Indicator
5

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