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SUBWOOFER SYSTEM
YST-SW215 SERVICE MANUAL
IMPORTANT NOTICE
YST-SW215
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.
s CONTENTS
TO SERVICE PERSONNEL .......................................... 2 BLOCK DIAGRAM ......................................................... 8
INTERNAL VIEW ........................................................... 2 PRINTED CIRCUIT BOARD .................................... 9~10
SPECIFICATIONS / ........................................ 3 SCHEMATIC DIAGRAM .............................................. 11
REAR PANELS .......................................................... 3~4 PARTS LIST ........................................................... 13~20
DISASSEMBLY PROCEDURES ............. 5~6
CONFIRMATION OF AUTO STANDBY OPERATION /
7
100854
P.O.Box 1, Hamamatsu, Japan
YST-SW215
AC LEAKAGE
s TO SERVICE PERSONNEL WALL EQUIPMENT TESTER OR
1. Critical Components Information
OUTLET UNDER TEST EQUIVALENT
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 INSULATING
that all exposed conductive surfaces are properly insulated TABLE
from supply circuits.
q Meter impedance should be equivalent to 1500 ohm shunted q Leakage current must not exceed 0.5mA.
by 0.15µF. q 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 4A, 125V FUSE."
CAUTION
F1: REPLACE WITH SAME TYPE 4A, 125V FUSE.
YST-SW215
ATTENTION
F1: UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 4A, 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.
s INTERNAL VIEW
1 2 3 4 5
1 MAIN (8) P.C.B.
2 MAIN (4) P.C.B.
3 MAIN (1) P.C.B.
4 MAIN (3) P.C.B.
5 MAIN (2) P.C.B.
6 POWER TRANSFORMER
7 MAIN (7) P.C.B.
8 MAIN (6) P.C.B.
9 MAIN (5) P.C.B.
6 7 8 9
2
YST-SW215
s SPECIFICATIONS /
Type / Advanced Yamaha Active Servo Technology Weight / 11.5 kg (25 lbs. 6 oz.)
Output Power / 120 W (100 Hz, 5 , 10% T.H.D.) Finish
Input Sensitivity / Cherry Color ............................... U, C, A, B, G, R, T, K, J models
INPUT1 (SP) ............................... 1 V (50 Hz, 120 W / 5 , L + R) Black Color ...................................... U, C, A, B, G, R, T, J models
INPUT2 (PJ) ........................... 50 mV (50 Hz, 120 W / 5 , L + R) Accessories /
Input Impedance / Subwoofer Cable (3 m) x 1 (J model), Speaker cable (4 m) x 2 (J
INPUT1 (SP) ....................................................................... 2.2 k model), Nonskid Pad x 4
INPUT2 (PJ) ......................................................................... 12 k
Frequency Response / 28 Hz to 200 Hz * Specifications are subject to change without notice due to product
improvements.
Driver / 8" (20 cm) cone, Magnetic Shielding Type
Input Section /
INPUT1 .............................................................. Speaker Terminal U .......... U.S.A. model C ...... Canadian model
INPUT2 .................................................................... RCA Pin Jack A .......... Australian model B ...... British model
Operation Section / G .......... European model R ...... General model
T .......... Chinese model K ...... Korean model
Front Panel ....... STANDBY/ON Switch, B.A.S.S. Switch, Volume J ........... Japanese model
YST-SW215
Control, High Cut Control, LED Indicator
Rear Panel ....... Power Switch, Auto Standby Switch (HIGH /
LOW / OFF), Phase Switch (NORM / REV), · DIMENSIONS
Voltage Selector (R, T, K models only)
322(12-11/16") 27
Power Supply / 290(11-7/16") (1-1/16")
295(11-5/8")
U, C models ........................................................ AC 120 V, 60 Hz
A model ............................................................... AC 240 V, 50 Hz
B, G models ........................................................ AC 230 V, 50 Hz
290(11-7/16")
R, T, K models ................... AC 240 / 220 / 120 / 110 V, 50/60 Hz
(2-3/4") 360(14-3/16")
J model .......................................................... AC 100 V, 50/60 Hz
Power Consumption /
U, C, A, B, G, R, T, K models ............................................... 95 W
J model .................................................................................. 70 W
Standby Power Consumption / 0.5 W
Dimensions / (W x H x D) ................. 290 x 360 x 322 mm
70
(11-7/16" x 14-3/16" x 12-11/16")
s REAR PANELS
U, C models A model
3
YST-SW215
B, G models R model
YST-SW215
T model K model
J model
4
YST-SW215
s 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
YST-SW215
Base
2 2
Connector
Speaker Unit
Fig. 1
2. Removal of Front Panel Ass'y
a. Remove 4 screws (3). (Fig. 2)
* Use an Allen wrench (2.5mm) to unscrew the Front
Panel Ass'y.
b. Pull out the front panel ass'y and remove CB4. (Fig. 2)
Front panel Ass'y
CB4
3
3
Fig. 2
5
YST-SW215
3. Removal of Rear Panel Ass'y
a. Remove 8 screws (4). (Fig. 3)
* Screws (4) are identified with arrow marks ( ).
b. Pull out the rear panel ass'y. (Fig. 3)
a. Remove 2 screws (5). (Fig. 3)
* Screws (5) are identified with arrow marks ( ).
b. Remove the rear cover. (Fig. 3)
YST-SW215
4
5
5
Fig. 3 4
When Checking the P.C.B.:
· Connect all the connectors removed during
disassembly back to the original positions.
· Spread cloth first and place the rear panel ass'y
on it. (Fig. 4)
Rubber sheet and cloth
Fig. 4
6
YST-SW215
s CONFIRMATION OF AUTO STANDBY OPERATION /
Setting
1) Turn off the power switch located on the rear panel.
2) In order to shorten the time required for operation
check; connect a 10 k resistor at both ends of R252
on the MAIN P.C.B. (3).
3) Connect the output signal from the signal generator to
the L / MONO terminal of the unit.
4) Set the signal generator for the sine wave of 100 Hz, 8
mV.
5) Turn on the power switch located on the rear panel.
Confirmation
1) Set the AUTO STANDBY switch to the LOW position.
YST-SW215
2) Turn on the STANDBY/ON switch.
The display LED lights up (green) and its color changes
to red after 5 to 10 seconds.
3) Turn off the STANDBY/ON switch.
The display LED goes off.
4) Set the AUTO STANDBY switch to the HIGH position.
5) Turn on the STANDBY/ON switch.
The display LED lights up (green) and its color remains
unchanged even after time have elapsed.
6) Turn off the STANDBY/ON switch.
The display LED goes off.
After Confirmation
1) Turn off the power switch located on the rear panel.
2) Disconnect the 10 k resistor connected to both ends
of R252.
7
YST-SW215
8
+ SW1 VR1
PHASE VOLUME
L IC11A SELECT
YST-SW215
3 IC11B IC10A B.P.F. L.P.F
1 6 7 Q201--204
7 8 6 IC7A 6dB/oct
5 6 + 8 4 IC7B DRIVER
2 + 2 4 IC10B
INPUT 1 + 2 3
12 RY1
IC1
L.P.F. L.P.F. H.P.F.
R 6dB/oct 12dB/oct 12dB/oct BASS L.P.F. 1
SELECT 12dB/oct POWER
+ SW3 A.N.I.C
AMP
HIGH CUT IC2, Q16
VR2 0.1
+
s BLOCK DIAGRAM
L
OUTPUT LIMITER
Q5, 6, 7, 8
D4, 5, 22, 23
R
+ Q21, 22 1 IC3
D24 Q1, 2
PROTECTION
L
+B
INPUT 2 POWER SUPPLY POWER
D1 SW5
T2 F1 RY2
R
+15 Q9
8
4 REGULATOR
TIMER 3
-15 Q10
R252 IC201
OFF
6 -B
L 7
H
Q209
SUB
POWER SUPPLY
D203
AUTO REGULATOR T1
STANDBY Q205 + REGULATOR
SW2 MUSIC C227 Q207, 208
IC202
SENSOR D204
IC4 STANDBY/ON
D9 D202 SW4 (R, T, K models only)
OFF
L
H AUTO POWER ON/OFF CIRCUIT
D12
Q206
A B C D E F G H I J
YST-SW215
1
s PRINTED CIRCUIT BOARD (Foil side)
· Semiconductor Location
Ref. No. Location DRIVER
D1 J3
D2 I4
D3 J4 MAIN (6) P.C.B.
D4
D5
F3
F3
MAIN (3) P.C.B. MAIN (1) P.C.B.
2 D6 H3
D7 F3
D9 H4
D12 I6
D19 H3
D20 G3
D21 G3 +
D22 F4 RE
D23 F4
D24 J3
D202 H6
3 IC1 H2
REV
BL
PHASE
IC2 H4
IC3 H4
BASS
RE
TOVL
PWS
MA1
MA2
NORM
+V1
+15
IC4 D5
LIM
-15
E
IC7 F6
IC10 C3
IC11 D5
HIGH
IC201 D4
STANDBY
Q1 G3
AUTO
LOW
Q2 G3
Q5 F4
4
OFF
Q6 F4
Q7 F3
Q8 G3
Q9 I4
Q10 J4
INPUT2
Q16 G4
Q21 H4
BASS
TOVL
VCC
PWS
+V1
MA1
MA2
+V1
+15
LIM
Q22 H4
-15
E
E
Q201 D2
Q202 D3
MAIN (2) P.C.B.
BASS
TOVL
MAIN
PWS
VCC
Q203 D2
+V2
+15
5
-15
E
Q204 D2
Q205 C4
Q206 H6
MAIN (4) P.C.B. MAIN (8) P.C.B.
L
INPUT1/OUTPUT
LEDG
LEDR
6
E1
LEDG
LEDR
R
E1
B.A.S.S. STANDBY/ON
VOLUME HIGH CUT
7
9
A B C D E F G H I J
YST-SW215
1
s PRINTED CIRCUIT BOARD (Foil side)
AC POWER
MAIN (1) P.C.B.
VCC
+V1
E
2
OR
· Semiconductor Location
WH
OR
Ref. No. Location
D203 B3
D204 A3
D205 B3
GY
MAIN (5) P.C.B. IC202 A2
GY
Q207 A3
Q208 A3
Q209 A3
3
BE
MAIN (2) P.C.B.
R, T, K models
4
J, U, C, A, B, G models
MAIN (7) P.C.B.
BE WH RE BL YE BR GR BE BE
MAIN (7) P.C.B.
WH
MAIN (9) P.C.B.
5
GR
YE
RE
BR
6
BL
BE
VOLTAGE
MAIN (6) P.C.B. MAIN (6) P.C.B. SELECTOR
RE BL RE RE BL RE
7
MAIN (1) P.C.B. MAIN (1) P.C.B.
10
A B C D E F G H I J K L
YST-SW215
SCHEMATIC DIAGRAM
IC1: STK404-120
1 Power Amp.
B.P.F L.P.F
-14.6
0
10.7
0 0 0
10.7
0
0 10.0
14.8
14.0
0.1 10.7
0 0
0.1 0.7
0
L.P.F. 0
2
POWER AMP PROTECTION
0 0 50.1
1.2
-1.1
50.1
-50.2
0.3
0.3
-49.6
IC2, 4, 7, 10: µPC4570HA
0
0
0
0 -14.6 0.1
-0.1 50.0 Dual OP-Amp
50.3
1.2
14.8
14.8 LIMITER 0
-0.3
0
14.9
1 2
0 0 0
8.0
5.4
4.6
4.6
- + + -
0 0
0.1 0 12 3 4 5 6 7 8 9
0 Vcc Vo1 -Vm1 +Vm1 VEE +Vm2 -Vm2 Vo2 Vcc
0
1.5
6.6
8.0
0
3 0.1 0
0 0
0 0 0
0.1
-14.8
6.8 8.0 4.9
6.7 0
3.9 1.4
3.9 0
0
IC3 : TA7317P
Protector
AUTO POWER ON / OFF CIRCUIT PROTECTION 8