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SUBWOOFER SYSTEM
YST-SW011 SERVICE MANUAL
IMPORTANT NOTICE
YST-SW011
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.
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 ........................................................... 11~17
DISASSEMBLY PROCEDURES ............. 7~8
100944
P.O.Box 1, Hamamatsu, Japan
'05.02
YST-SW011
I TO SERVICE PERSONNEL
AC LEAKAGE
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 Leakage current must not exceed 0.5mA.
G Meter impedance should be equivalent to 1500 ohms
shunted 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
F1: REPLACE WITH SAME TYPE 1.6A, 125V FUSE.
YST-SW011
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-SW011
I SPECIFICATIONS / Advanced YST
Advanced Yamaha Active Servo
Technology is a unique system to
Type / Advanced Yamaha Active Servo Technology let the speaker unit have a per-
Output Power / (100 Hz, 5 ohms, 10% T.H.D.)
fectly linear motion by the speaker
........................................................................................ 50 W
and amplifier combination.
Input Sensitivity / (50 Hz, 50W / 5 ohms)
INPUT (PJ)
...................................................................................... 50 mV
Dynamic Power / (5 ohms)
...................................................................................... 100 W
Input Impedance /
INPUT (PJ) ............................................................. 12 k-ohms
Frequency Response /
....................................................................... 30 Hz to 200 Hz
YST-SW011
Driver / (Magnetic Shielding Type) QD-Bass Technology
....................................................................... 8" (20 cm) cone QD-Bass (Quatre Dispersion
Input Section / Bass) technology is a Yamaha
INPUT ............................................................... RCA Pin Jack unique technology to radiate the
sound efficiently in four horizontal
Operation Section /
direction.
Rear Panel .... Power Switch, Volume Control, LED Indicator,
Voltage Selector (R, T, K, L models)
Power Supply /
U, C models .................................................. AC 120 V, 60 Hz
R, L models ................... AC 110-120 / 220-240 V, 50 / 60 Hz
T model ................................. AC 110-120 / 220-240 V, 50 Hz
K model ................................. AC 110-120 / 220-240 V, 60 Hz
A model ......................................................... AC 240 V, 50 Hz
B, G models .................................................. AC 230 V, 50 Hz
J model ................................................. AC 100 V, 50 / 60 Hz · DIMENSIONS /
Power Consumption / 302.5 (11-15/16") 12.5
U, C, R, T, K, A, B, G, L models ................................... 45 W 290 (11-7/16") 290 (11-7/16") (1/2")
J model ........................................................................... 30 W
Dimensions / (W x H x D)
290.5 (11-7/16")
361 (14-3/16")
............................................................. 290 x 361 x 302.5 mm
(11-7/16" x 14-3/16" x 11-15/16")
Weight /
.............................................................. 10.0 kg (22 lbs. 1 oz.)
Finish
Cherry Color ............................. R, T, K, A, B, G, L, J models
Black Color ........................... U, C, R, T, A, B, G, L, J models
70.5
(2-13/16)
Silver Color ...................... U, C, R, T, K, A, B, G, L, J models
Unit : mm (inch)
Accessories /
Subwoofer Cable (5 m) x 1, Nonskid Pad x 4
* Specifications are subject to change without notice due to
product improvements.
U .......... U.S.A. model C ...... Canadian model
R .......... General model T ....... Chinese model
K .......... Korean model A ...... Australian model
B .......... British model G ...... European model
L .......... Singapore model J ....... Japanese model
3
YST-SW011
I INTERNAL VIEW
1 2
YST-SW011
3
8 7 6 5 4
Rear Panel
1 MAIN (3) P.C.B.
2 MAIN (1) P.C.B.
3 MAIN (6) P.C.B.
4 MAIN (7) P.C.B. (U, C, A, B, G, J models)
MAIN (10) P.C.B. (R, T, K, L models)
5 Power Transformer
6 MAIN (9) P.C.B. (R, T, K, L models)
7 MAIN (2) P.C.B.
8 MAIN (4) P.C.B.
4
YST-SW011
I REAR PANELS
U, C models R model
POWER INDICATOR POWER INDICATOR
YST-SW011
T model K model
POWER INDICATOR POWER INDICATOR
5
YST-SW011
A model B, G models
POWER INDICATOR POWER INDICATOR
YST-SW011
L model J model
POWER INDICATOR POWER INDICATOR
6
YST-SW011
I DISASSEMBLY PROCEDURES /
(Remove parts in the order as numbered.)
Disconnect the power cable from the AC outlet.
1. Removal of Driver
a. Remove 4 screws (1) and then remove the Base. (Fig. 1)
b. Remove 4 screws (2) and then remove the Driver. (Fig. 1)
c. Disconnect the connector connected to the terminal of the
Driver. (Fig. 1)
1 1
Base
YST-SW011
2 2
Driver
Connector
Fig. 1
2. Removal of Rear Panel Ass'y
a. Remove 8 screws (3). (Fig. 2)
* Screws (3) are identified with arrow marks ( ).
b. Pull out the rear panel ass'y. (Fig. 2)
3
3
Fig. 2
7
YST-SW011
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 them. (Fig. 3)
YST-SW011
Rubber Sheet and Cloth
Fig. 3
I BLOCK DIAGRAM
VR1
VOLUME
INPUT POWER
IC4A AMP
3 IC5A
- 2 4 IC5B
+ +B RY1 DRIVER
4 + 2 6 +
PJ1 8 2 9
- 10
1 IC1
+
8
L.P.F. L.P.F. H.P.F. -B
6dB/oct 12dB/oct 12dB/oct
A.N.I.C
IC2
Q16 R28
D19~21 0.1
LIMITER
Q5,6,7,8
+B
D4,5,22,23 2
F1
T1 IC3
+15 Q9,D2
POWR POWER PROTECTION
REGULATER SUPPLY SW1
D1
Q10,D3
-15
-B
8
A B C D E F G H I J
YST-SW011
MAIN (1) P. C. B. (Lead Type Device)
1
I PRINTED CIRCUIT BOARD (Foil side) Lead Free Solder Used
MAIN (3) P. C. B. (Lead Type Device)
DRIVER
C73
VOLUME
WH
2
RE
RE
J42
INPUT BL
-15 RE
+15
-V
E
MAIN
3
Circuit No. U, C, A, B, G, J R, T, K, L
POWER F2 X O
INDICATOR CB4, 5 X O
SW2 X O
W7 X O
W8 X O
W9 X O
W10 X O
MAIN
E
-V
+15
-15
4 · Semiconductor Location
Ref. no. Location Ref. no. Location Ref. no. Location Ref. no. Location
D1 I2 D19 G3 IC2 G3 Q6 F3
MAIN (7) P. C. B. MAIN (6) P. C. B.
D2 H4 D20 F3 IC3 H3 Q7 E3 MAIN (2) P. C. B. (Lead Type Device)
D3 I4 D21 F3 IC4 B3 Q8 F3 (Lead Type Device) BE RE
D4 E3 D22 E3 IC5 B2 Q9 I4 (Lead Type Device) U, C, A, B, G, J models
D5 F3 D23 F3 Q1 F2 Q10 I4
D6 G2 D24 J3 Q2 G2
D7 F2 IC1 G1 Q5 E3
Power BL
WH Transformer
U, C, A, B, G, J models
5
WH BE
WH RE
R, T, K, L models
WH
POWER
BE
ON/OFF
RE BE YE
BE
BE
6
BE
BR
SELECTOR
VOLTAGE
BR
Power
Transformer
MAIN (4) P. C. B. RE
(Lead Type Device) YE R, T, K, L models
R, T, K, L models
MAIN (10) P. C. B.
7
MAIN (9) P. C. B. WH
(Lead Type Device)
(Lead Type Device)
9
A B C D E F G H I J
YST-SW011
1
I SCHEMATIC DIAGRAM
POWER AMP.
MAIN (3) MAIN (1)
L.P.F.
-1.1
9 14.4
0.2
0.2
0
-32.6
14.5
1.2
-33.0
33.0
0.1
4 5 -14.2
2 6
0
LIMITER
1.8
3 0 0.1 8 s9
s10
0 7 0
0.1 33.0
3
INPUT 0 2 s10 32.6
4 32.9
0
0 0.1
5 -14.2 L.P.F. H.P.F.
-0.7
0.1
2 14.5
0 0 0
VOLUME -1.8 0 0
0 (J, U, C, R, T, L)
L=450
0 (K, A, B, G)
7 0 L=520
0 8
0 L1
6 0
0.1
0
9 14.4 0 0
DRIVER
0 0 0
s11
-14.3
PROTECTION
-0.7
-0.7
3
0
0
0
1.1
0
1.4
3.2
0
-1.8
0
0 -0.2
7
IC2, 4, 5: µPC4570HA
0 8 3 Dual OP-Amp
6 -0.2 0 0 2 -0.3
0 4 0
5 -14.2 0
1 14.4
23.9 1.1
1 2
- + + -
A.N.I.C. 1 2 3 4 5 6 7 8 9
Vcc Vo1 -Vm1 +Vm1 VEE +Vm2 -Vm2 Vo2 Vcc
4
-30.1
MAIN (10) 0
+33.0
REGULATOR
MAIN (6) MAIN (7) MAIN (6) WC05070 WC05070
30.3 14.4
AC 49.1
15.0
15.0
0 C18 0.068 0.033 0.033 0.068
R93, 94 4.7k 10.0k 10.0k 4.7k
K1T25,0X12,0X15 K1T25,0X12,0X15
0 s11 L1 X X