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SUBWOOFER SYSTEM
YST-SW225 SERVICE MANUAL
YST-SW225
FRONT VIEW TOP VIEW
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 ....................................................... 10
SPECIFICATIONS / ........................................ 3 PRINTED CIRCUIT BOARD .................................. 11~12
INTERNAL VIEW ........................................................... 4 SCHEMATIC DIAGRAM .............................................. 13
REAR PANELS .......................................................... 4~5 PARTS LIST ........................................................... 15~23
DISASSEMBLY PROCEDURES ............. 6~7
ADJUSTMENTS / 8~9
100895
P.O.Box 1, Hamamatsu, Japan
'04.07
YST-SW225
AC LEAKAGE
I 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.
G Meter impedance should be equivalent to 1500 ohm 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 4A, 125V FUSE."
CAUTION
F1: REPLACE WITH SAME TYPE 4A, 125V FUSE.
ATTENTION
F1: UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 4A, 125V.
WARNING: CHEMICAL CONTENT NOTICE!
The solder used in the manufacturing process except soldering of the P.C.B. ass'y contains LEAD. In addition, other
YST-SW225
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 /
All P.C.B.s used for this product are soldered with lead
free soldering material which is an alloy of Sn+Ag+Cu (tin
+ silver + copper).
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-SW225
I SPECIFICATIONS /
Type / ...... Advanced Yamaha Active Servo Technology · DIMENSIONS
Output Power / (100 Hz, 5 ohms, 10% T.H.D.) ... 120 W
Dynamic Power / (5 ohms) ... 150 W 349.4 (13-3/4")
290 (11-7/16") 2.8 290 (11-7/16") 56.6
Input Sensitivity / (1/8") (2-3/16")
INPUT1 (SP) ........................................................ 1.5 V
INPUT2 (PJ) ....................................................... 70 mV
350 (13-3/4")
Input Impedance /
INPUT1 (SP) ................................................ 2.2 kohms
INPUT2 (PJ) .................................................. 12 kohms
Frequency Response / ........ 28 Hz to 200 Hz
Driver / .................. 8" (20 cm) cone,
Magnetic Shielding Type
Input Section / Unit : mm (inch)
: mm ( )
INPUT1 ............................................. Speaker Terminal
INPUT2 ................................................... RCA Pin Jack
Operation Section /
Top Panel ....... STANDBY/ON Switch, B.A.S.S. Switch,
High Cut Filter Switch, Volume Control,
High Cut Control, LED Indicator
Rear Panel ..... Power Switch, Auto Standby Switch Advanced YST
YST-SW225
(HIGH / LOW / OFF), Phase Switch Advanced Yamaha Active Servo Technology is a
(NORM / REV), Voltage Selector (L, R unique system to let the speaker unit have a perfectly
models only) linear motion by the speaker and amplifier
Power Supply / combination.
U, C models ...................................... AC 120 V, 60 Hz
R, L models ..... AC 240 220 / 120 110 V, 50/60 Hz
T model ............................................. AC 220 V, 50 Hz
K model ............................................. AC 220 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
Power Consumption /
U, C, R, T, K, A, B, G, L models .......................... 65 W
J model ................................................................. 50 W
QD-Bass Technology
Standby Power Consumption / ...... 0.5 W
QD-Bass (Quatre Dispersion Bass) technology is a
Dimensions / (W x H x D) ... 290 x 350 x 349 mm
Yamaha unique technology to radiate the sound
(11-7/16" x 13-3/4" x 13-3/4")
efficiently in four horizontal direction.
Weight / ................................ 11.5 kg (25 lbs. 6 oz.)
Finish
Cherry Color ........................ C, R, T, K, G, L, J models
White Color .................... R, T, K, A, B, G, L, J models
Silver Color ......................... U, C, T, A, B, G, L models
Black Color ....................................... U, C, T, A models
Accessories /
Subwoofer Cable (5 m) x 1 (J model), Speaker cable (4
m) x 2 (J model), Nonskid Pad x 4
* Specifications are subject to change without notice due to product
improvements.
U .......... U.S.A. model A ...... Australian model
C .......... Canadian model B ...... British model
R .......... General model G ...... European model
T .......... Chinese model L ....... Singapore model
K .......... Korean model J ....... Japanese model
3
YST-SW225
I INTERNAL VIEW
1 2 3 45 6
1 MAIN (8) P.C.B.
2 Driver
3 MAIN (10) P.C.B.
4 MAIN (1) P.C.B.
5 MAIN (2) P.C.B.
6 MAIN (3) P.C.B.
7 MAIN (4) P.C.B.
8 Power Transformer
7 9 MAIN (5) P.C.B.
8
9
Front Side Right Side
YST-SW225
I REAR PANELS
U, C models R model
4
YST-SW225
T model K model
A model B, G models
YST-SW225
L model J model
5
YST-SW225
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
YST-SW225
Base
2 2
Connector
Driver
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)
c. Disconnect the connector (CB2) connected to the MAIN
(8) P.C.B. (Fig. 2)
d. Remove 5 screws (4). (Fig. 2)
e. Remove the Control Unit from the Rear panel. (Fig. 2)
f. Disconnect the connector (CB3) connected to the MAIN
(3) P.C.B. (Fig. 2)
g. Remove 2 screws (5). (Fig. 2)
* Screws (5) are identified with arrow marks ( ).
h. Remove the Rear Cover. (Fig. 2)
6
YST-SW225
CB2
3
5
4
CB3
5
YST-SW225
3 4
Fig. 2
When Checking the P.C.B.:
· Rear Panel Ass'y and Control Unit are
assembled.
· 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. 3)
Rubber Sheet and Cloth
Fig. 3
7
YST-SW225
I ADJUSTMENTS /
G Confirmation of Power Amp operation
For the power amplifier which has been repaired, it is
absolutely necessary to confirm that a correct A B
waveform is obtained at points indicated by A
and B
in
the schematic diagram according to the following
procedure.
Devices required
Signal generator
8 or 6 load resistor
Oscilloscope (dual trace type)
Connection
1) Connect the output signal from the signal generator to
the input terminal of the unit.
2) Disconnect the connector terminal connected to the
speaker unit and reconnect it to the load resistor.
3) Connect the HOT side of the oscilloscope CH1 probe to
the point A or B indicated in the figure and the GND side
to the GND of the main unit.
4) Connect the oscilloscope CH2 input to the red side of
the connector cable, which is connected with the load
YST-SW225
resistor.
At this time, the GND terminal of CH2 must be left
unconnected.
Setting
1) Set the signal generator to the sine wave, 100 Hz and
minimum output level settings.
2) Set the volume of the unit to the minimum position.
3) Turn on the power to the unit.
4) Adjust the output level of the signal generator and the
volume of the unit so that the output level observed at
oscilloscope CH2 is 28 Vp-p.
Waveform observation
With the settings made as described above, observe
the waveform obtained at CH1 for judgment.
Point A (Cathode of D34) Point B (Anode of D33)
V : 20 V/div H : 2 msec/div V : 20 V/div H : 2 msec/div
DC range 1 : 1 probe DC range 1 : 1 probe
8
A B C D E F G H I J
YST-SW225
1 G Idling Adjustment Schematic Diagram /
To stabilize operation of the amplifier, turn ON the power
with no input signal and wait for 2 to 3 minutes in non
loaded condition before the adjustment.
Confirm that the voltage across the terminals TP1 and TP2
is 10 mV to 300 mV.
If it exceeds 300 mV, open (cut off) R110.
PS AMP
IDLING CURRENT ADJ.
ADJ
2
G Confirmation of AUTO STANDBY operation
Setting PS
1) Turn off the power switch located on the rear panel. AMP
2) In order to shorten the time required for operation POWER
check; connect a 10k resistor at both ends of R72 on DRIVE A
the MAIN (2) P.C.B. (Refer to page 12)
3) Connect the output signal from the signal generator to DRIVER
the INPUT 2 / L/MONO terminal of the unit.
4) Set the signal generator for the sine wave of 100Hz,
8mV.
3 5) Turn on the power switch located on the rear panel.
POWER B
Confirmation DRIVE
1) Set the AUTO STANDBY switch to the LOW position.
PS AMP
2) Turn on the STANDBY/ON switch. PS AMP
4
The display LED lights up (green) and its color changes
to red after 4 to 5 seconds.
3) Turn off the STANDBY/ON switch.
The display LED goes off.
4) Set the AUTO STANDBY switch to the HIGH position. DC 10 mV to 300 mV
5
5) Turn on the STANDBY/ON switch. Printed Circuit Board /
The display LED lights up (green) and its color remains
unchanged even after time have elapsed.
MAIN (1) P.C.B. MAIN (10) P.C.B.
6) Turn off the STANDBY/ON switch.
The display LED goes off.
After confirmation
1) Turn off the power switch. IDLING CURRENT ADJ.
2) Disconnect the 10k resistor connected to both ends of D34 D33
6 TP1
R72. R110
B
GND A
TP2
DC 10 mV to 300 mV
7
9
A B C D E F G H I J
YST-SW225
1
I BLOCK DIAGRAM
SW7 SW3
HIGH CUT FILTER B.A.S.S.
+ VR1 PASS PASS MOVIE MOVIE POWER +B
SW1 PRE DRIVE
PHASE VOLUME Q13--17 DRIVE
L IC1A SELECT Q25, 26 DRIVER
ON ON MUSIC MUSIC Q20, 21 PS AMP Q24C, 32
3 IC1B IC2A
+ 1 6 3 IC3B RY1
7 2 5 IC4A IC4B IC3A
5 + 4 + + 7 3 5 3
2 6 + 1 + 7 + 1
INPUT 1 2 6 2 +
+
2 L.P.F. L.P.F. H.P.F. H.P.F.
PS AMP Q24A, 33
R 6dB/oct 12dB/oct 12dB/oct 12dB/oct
+ B
LIMITER
Q5--8
HIGH CUT A.N.I.C
VR2 IC8 IC5
+ 0.1
L
3
OUTPUT
8
OFF
R 4
L TIMER 3
+ R72
IC7
Q10, 11 PROTECTION
H 6
Q23, 28, 30, 34
AUTO STANDBY 7
SW2
MUSIC +
L SENSOR C39
OFF IC6
4 INPUT 2 Q9
L
R
+B
H AUTO POWER POWER SUPPLY RY2
ON/OFF CIRCUIT D21 F1
+15 Q18
POWER
REGULATOR
SW5
15 Q19
5
B
Q3
SUB
POWER SUPPLY
D1
T1
REGULATOR REGULATOR
6 IC8 Q1, 2
STANDBY/ON D4
D10 D6
SW4
(R, L models only)
D2 D3
Q4 G R G R
7
10
A B C D E F G H I J
YST-SW225
1
I PRINTED CIRCUIT BOARD (Foil side) Lead Free Solder Used
MAIN (3) P. C. B. HIGH CUT VOLUME
· Semiconductor Location
MAIN (8) P. C. B. Ref. no. Location Ref. no. Location
STANDBY/ON B.A.S.S. HIGH CUT FILTER
D2 B2 IC4 G3 OFF MOVIE PASS
D3 B2 IC5 B6
D6 C4 Q4 B4 ON MUSIC ON
D7 B4 Q5 B4
D9 B4 Q6 B4
D10 B4 Q7 B4
2 D12 B4 Q8 B4
D13 B4 Q10 C6
D15 B5 Q11 C6
D16 C5 Q13 C4
D17 C5 Q14 B5
D19 B7 Q15 B5
D20 B7 Q16 B5
D36 C7 Q17 C4
D37 C7 Q18 B7
LEDG
LEDR
IC1 G6 Q19 C7
E1
IC2 I6 Q20 C5
IC3 I3 Q21 C5
3
MAIN (1) P. C. B. LEDG
E1
LEDR
SIG
E
AUT
MA +15
E -15
C79
AUT
-15
+15
VCC
PWS
4
AUT
PWS
PWS
VCC
+15
-15
AUT
E
MA
VCC
+V1
E
MAIN (2)
+B1
MAIN (4) P. C. B.
DR+
TR-B
5 DR- OUTPUT / INPUT 1 INPUT 2 PHASE
OUT
-B1
AYST
+15 NORM REV
E
POW
MAIN (10)
6
SIG
E
G AUT
+15
AC
-15
+B
SG
-B
7 MAIN (10)
11
A B C D E F G H I J K
YST-SW225 · Semiconductor Location
Ref. no. Location Ref. no. Location Ref. no. Location Ref. no. Location
D1 C4 D27 J5 IC7 B6 Q25 J4
1
I PRINTED CIRCUIT BOARD (Foil side) Lead Free Solder Used D4
D5
B5
B4
D28
D29
J5
J2
IC8
Q1
B5
B5
Q26
Q28
J3
H4
D18 H6 D30 J2 Q2 B5 Q29 I3
D21 I6 D31 J2 Q3 B5 Q30 I4
GY OR MAIN (5) P. C. B. D22 I5 D32 H4 Q9 B6 Q31 I4
D23 I2 D33 I3 Q22 J3 Q32 J5
D24 I5 D34 I4 Q23 I4 Q33 J2
D25 I2 D35 I3 Q24A J2 Q34 I4
WH RE D26 J5 IC6 B6 Q24C J5
MAIN (7) P. C. B. MAIN (6) P. C. B.
2 POWER
2SD1889
ON OFF
BE
BE
2SB1340
TRANSFORMER
+B1
OR DR+
3 TR-B
POWER
GY DR-
WH OUT
MAIN (1)
-B1
AYST
2SC1846S
+15
E
POW
WH
2SD1889
4 MAIN (2) P. C. B.
2SB1340
R, L models
MAIN (7) P. C. B. MAIN (6) P. C. B.
5
MAIN (1)
AUT
PWS MAIN (9) P. C. B. G
MAIN (1)
VCC AC
+V1 +B
E BE
SG
-B
BR BE YE
BE
AUTO GY
STANDBY
TRANSFORMER
VOLTAGE SELECTOR
6
GY POWER
OFF
LOW BR
HIGH
YE
MAIN (10) P. C. B.
WH
R72
add 10 kohms
7 CONFIRMATION OF
AUTO STANDBY OPERATION
12
A B C D E F G H I J K L
YST-SW225
SCHEMATIC DIAGRAM
1
VOLUME HIGH CUT L.P.F.
14.7 50.1
0 50.1
0
0 LIMITER PS AMP
OUTPUT
0
INPUT1
0 0
14.7 49.5 50.1
14.7 49.6
0 49.6