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SUBWOOFER SYSTEM
YST-SW216 SERVICE MANUAL
YST-SW216
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, 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 .......................................................... 4~5 PARTS LIST ........................................................... 11~15
DISASSEMBLY PROCEDURES 6~7
100993 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-SW216
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.
YST-SW216
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
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-SW216
I SPECIFICATIONS
Type .................. Advanced Yamaha Active Servo Technology II Finish
Output Power ..................... 50 W (100 Hz, 5 ohms 10% T.H.D) Black color ....................................... U, C, R, A, B, G, L models
Input Sensitivity ....................... 50 mV (100 Hz, 50 W / 5 ohms) Accessories
Nonskid pad x 4
Dynamic Power .................................................. 100 W, 5 ohms
Input Impedance ....................................................... 12 k-ohms
* Specifications are subject to change without notice due to
Frequency Response ....................................... 25 Hz to 180 Hz product improvements.
YST-SW216
Driver ........................................... 25cm (9-13/16") Cone Woofer
Magnetic Shielding Type U .......... U.S.A. model C ...... Canadian model
Input/Output Section R .......... General model A ...... Australian model
INPUT1/OUTPUT ........................................... Speaker Terminal B .......... British model G ...... European model
INPUT2 ................................................................... RCA Pin jack L .......... Singapore model
Operation Section
Power Switch, Volume Control, High Cut Switch, LED indicator
Power Supply Advanced YST II
U, C models .................................................... AC 120 V, 60 Hz This subwoofer system employs
R, L models ...................... AC 110-120 / 220-240 V, 50 / 60 Hz Advanced Yamaha Active Servo
A model ........................................................... AC 240 V, 50 Hz Technology II which Yamaha has
B, G models .................................................... AC 230 V, 50 Hz
developed for reproducing higher
Power Consumption ......................................................... 45 W quality super-bass sound.
Dimensions (W x H x D) ......................... 340 x 340 x 384.5 mm This super bass sound adds a more
(13-3/8" x 13-3/8" x 15-1/8")
realistic, theater-in-the-home effect
Weight ..................................................... 11.2 kg (24 lbs. 11 oz.)
to your stereo system.
· DIMENSIONS
384.5 (15-1/8")
340 (13-3/8") 32 340 (13-3/8") 12.5
(1-1/4") (1/2")
340 (13-3/8")
Unit: mm (inch)
3
YST-SW216
I INTERNAL VIEW
1 2 1 MAIN (2) P.C.B.
2 MAIN (1) P.C.B.
3 MAIN (5) P.C.B.
4 MAIN (3) P.C.B.
5 MAIN (9) P.C.B. (R, L models)
6 Power Transformer
7
YST-SW216
MAIN (6) P.C.B.
8 MAIN (7) P.C.B. (U, C, A, B, G models)
MAIN (10) P.C.B. (R, L models)
8 7 6 5 4 3
I REAR PANELS
U, C models R model
Power Indicator Power Indicator
4
YST-SW216
A model B, G models
Power Indicator Power Indicator
YST-SW216
L model
Power Indicator
5
YST-SW216
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 7 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.
YST-SW216
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
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
Dowel Dowel
Metalblade
Flatblade screwdriver
Dowel
Fig. 1
6
YST-SW216
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)
YST-SW216
Rubber Sheet and Cloth
Fig. 2
7
YST-SW216
8
YST-SW216
VR1
VOLUME
+ IC4B POWER
7 IC4A AMP
8 3 IC5A +B DRIVER
L 6 + 2 4 IC5B
4 + + 2 6 + 9 RY1
8 2
10
IC1
1 +
INPUT 1 8
L.P.F. L.P.F. H.P.F.
6dB/oct 12dB/oct 12dB/oct -B
I BLOCK DIAGRAM
R A.N.I.C
+ SW8
IC6 R28
HIGH LOW 0.1
+ HIGH CUT
LIMITER
L
Q5, 6
D4, 5, 22, 23
OUTPUT PROTECTION
Q17~20
D7, 25
R
+
PJ1
L
INPUT 2
R
+B
F1
T1 Q9, D2 +15V
POWER
SW5
D1
REGULATOR
POWER SUPPLY
Q10, D3 -15V
-B
A B C D E F G H I J
YST-SW216
MAIN (1) P.C.B. (Side A)
1
I PRINTED CIRCUIT BOARD Lead Free Solder Used
SP+ 10 1
DRIVER
SP-
MAIN (2) P.C.B. (Side A)
OUTPUT / INPUT 1 INPUT 2 HIGH VOLUME
TO SPEAKERS FROM AMPLIFIER CUT
2 R L
+ - - + 0 10
RE
L /MONO / R
POWER RE
HIGH LOW INDICATOR
WH
BL
RE
3
9 1
1 9
C91
1 9 -V
-15
+15
E
MAIN
· Semiconductor Location
-V
-15
+15
E
MAIN
4 Ref. no. Location Ref. no. Location Ref. no. Location
D1 J2 D24 J3 Q5 G3
D2 H4 D25 F3 Q6 G3 Power
D3 I4 D28 I3 Q9 H4 MAIN (3) P.C.B. (Side A) Transformer
D4 H2 D29 I3 Q10 H4 WH MAIN (7) P.C.B. (Side A) BE RE
D5 H2 IC1 H2 Q17 F3
D6 G2 IC4 B3 Q18 F3 U, C, A, B, G models
D7 F2 IC5 D3 Q19 F3
D8 E3 IC6 G3 Q20 F3
D22 G2 Q1 F3
D23 G2 Q2 F3
BL
Circuit No. U, C, R, A, L B, G U, C, A, B, G models
5
C79 X O
C91 X O
R, L models WH RE
WH
WH BE BE
MAIN (6) P.C.B.
220V-240V
BE Power
BE Transformer (Side A)
6 SELECTOR
BE
VOLTAGE
POWER BR
ON OFF
AC IN RE
BR YE
110V-120V
WH
MAIN (10) P.C.B.
7 MAIN (9) P.C.B. (Side A) R, L models
MAIN (5) P.C.B. (Side A) RE BE YE
(Side A) R, L models
9
A B C D E F G H I J
YST-SW216
1
I SCHEMATIC DIAGRAM
MAIN (1) POWER AMP
1.1
14.2
-36.0
35.9
0
0.3
0.3
0
-35.7
35.9
1.7
-1.1
35.8
35.8
LIMITER 0
-10.0
2
0
MAIN (2)
0.3
0.3
0.3
0.3
0.3 0.2 0
0 0.3 0.2
0
INPUT 1/OUTPUT 0
0.3 -0.1 0
-0.1
14.2
DRIVER
0
0
0
-14.0 L.P.F.
24.2
3
INPUT 2 VOLUME 0.8
-13.9 A.N.I.C 14.2
1.3
L.P.F. H.P.F.
0.1
0 0
0 -14.0 0 0
1.3
0 14.2 0
0.8 0
0 0 0.1
0.1
0 0
C91
s11
-10 0.8
0 0
0
-1.9
PROTECTION
0
-34.3
36.0 30.2
4 30.2 14.2
14.8
0
REGULATOR 0
-14.5
AC 53.3 -30.4 -30.4 -13.9
MAIN (10) MAIN (6) MAIN (7) MAIN (6) POWER -36.0
SUPPLY
U, C, A, B, G models
5
POWER
MAIN (9) MAIN (3)
MAIN (5)
s11 C91 X X 0.01 X
IC1: STK404-070Y60W IC4~6: µPC4570HA-A
AF Power Amp Dual OP-Amp
TR7
6 R1 R4
TR6
1 2
- + + -
TR1 TR2 R5
TR8
C2 1 2 3 4 5 6 7 8 9
C1
R, L models Vcc Vo1 -Vm1 +Vm1 VEE +Vm2 -Vm2 Vo2 Vcc
R2
TR5
D1
R3 R6