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YST-SW325
SUBWOOFER SYSTEM
YST-SW325 SERVICE MANUAL
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 ........................................................... 15~22
DISASSEMBLY PROCEDURES ............. 6~7
ADJUSTMENTS / 8~9
2005 All rights reserved.
100961
P.O.Box 1, Hamamatsu, Japan
'05.07
YST-SW325
YST-SW325
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 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 3A, 125V FUSE."
CAUTION
F1: REPLACE WITH SAME TYPE 3A, 125V FUSE.
ATTENTION
F1: UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 3A, 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
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)
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-SW325
YST-SW325
I SPECIFICATIONS /
Type / .... Advanced Yamaha Active Servo Technology II · DIMENSIONS
Output Power / (100 Hz, 5 ohms, 10% T.H.D.) ... 150 W
Dynamic Power / (5 ohms) ... 170 W 374.4 (14-3/4")
315 (12-7/16") 2.8 315 (12-7/16") 56.6
Input Sensitivity / (50 Hz, 150 W/5 ohms, L+R) (1/8") (2-3/16")
INPUT1 (SP) ........................................................ 1.5 V
INPUT2 (PJ) ....................................................... 60 mV
Input Impedance /
380 (15")
INPUT1 (SP) .............................................. 2.2 k-ohms
INPUT2 (PJ) ................................................ 12 k-ohms
Frequency Response / ........ 25 Hz to 180 Hz
Driver / .................. 20 cm (8") cone,
Magnetic Shielding Type
Unit : mm (inch)
Input Section /
: 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
(HIGH / LOW / OFF), Phase Switch Advanced Yamaha Active Servo Technology is a
(NORM / REV), Voltage Selector (R, L unique system to let the speaker unit have a perfectly
models) linear motion by the speaker and amplifier
Power Supply / combination.
U, C models ...................................... AC 120 V, 60 Hz
R, L models ..... AC 110 120 / 220 240 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 .......................... 70 W
J model ................................................................. 60 W
QD-Bass Technology
Standby Power Consumption / ...... 0.5 W
QD-Bass (Quatre Dispersion Bass) technology is a
Dimensions / (W x H x D) .... 315 x 380 x 374 mm
Yamaha unique technology to radiate the sound
(12-7/16" x 15" x 14-3/4")
efficiently in four horizontal direction.
Weight / .............................. 13.0 kg (28 lbs. 10 oz.)
Finish
Cherry Color .......... U, C, R, T, K, A, B, G, L, J models
Black Color ............ U, C, R, T, K, A, B, G, L, J models
Accessories /
Speaker cable (4 m) x 2 (J model), Subwoofer Cable (5
m) x 1 (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-SW325
YST-SW325
I INTERNAL VIEW
1 2 3 4 5 6 7
B A0 9 8
1 MAIN (8) P.C.B.
Front Side Rear Side 2 Driver
3 MAIN (3) P.C.B.
4 MAIN (4) P.C.B.
5 MAIN (2) P.C.B.
6 MAIN (1) P.C.B.
7 MAIN (10) P.C.B.
8 Power Transformer
9 MAIN (6) P.C.B.
0 MAIN (7) P.C.B.
A MAIN (9) P.C.B. (R, L models)
B MAIN (5) P.C.B.
I REAR PANELS
U, C models R model
4
YST-SW325
YST-SW325
T model K model
A model B, G models
L model J model
5
YST-SW325
YST-SW325
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
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 1 screw (5). (Fig. 2)
* Screws (5) are identified with arrow marks ( ).
h. Remove the Rear Cover. (Fig. 2)
6
YST-SW325
YST-SW325
CB2
3
4
CB3
5
3 4
Fig. 2
When Checking the P.C.B.:
· Assemble Rear Panel Ass'y and Control Unit.
· Connect all the connectors removed during dis-
assembly back to the original positions.
· Spread cloth first and place the Rear Panel
Ass'y and Control panel on it. (Fig. 3)
Rear Panel Ass'y Rubber Sheet and Cloth
Control Unit
Fig. 3
7
YST-SW325
YST-SW325
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
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. (Fig. 1)
4) Connect the oscilloscope CH2 input to the red side of
the connector cable, which is connected with the load
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
28 Vp-p
28 Vp-p
8
A B C D E F G H I J
YST-SW325
1 G 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 10k resistor at both ends of R72 on
the MAIN (2) P.C.B. (Fig. 2)
3) Connect the output signal from the signal generator to
the INPUT 2 / L/MONO terminal of the unit.
PS AMP 4) Set the signal generator for the sine wave of 100Hz,
8mV.
2
5) Turn on the power switch located on the rear panel.
PS A Confirmation
AMP 1) Set the AUTO STANDBY switch to the LOW position.
DRIVER
3 2) Turn on the STANDBY/ON switch.
The display LED lights up (green) and its color changes
PS to red after 4 to 5 seconds.
PS AMP B 3) Turn off the STANDBY/ON switch.
AMP
The display LED goes off.
4) Set the AUTO STANDBY switch to the HIGH position.
PROTECTION
4
5) Turn on the STANDBY/ON switch.
The display LED lights up (green) and its color remains
unchanged even after time have elapsed.
MAIN (10) P.C.B.
6) Turn off the STANDBY/ON switch.
The display LED goes off.
After confirmation
D34 1) Turn off the power switch.
5 A B
2) Disconnect the 10k resistor connected to both ends of
R72.
MAIN (2) P.C.B.
D33
6 R72
R72
10 k
GND 10k
7
Fig. 1 Fig. 2
9
A B C D E F G H I J
YST-SW325
1
I BLOCK DIAGRAM
SW7 SW3
HIGH CUT FILTER B.A.S.S.
+ VR1 PASS PASS MOVIE MOVIE +B
SW1
PHASE VOLUME
L IC1A SELECT POWER DRIVER
OFF OFF MUSIC MUSIC PS AMP Q24C, 32
3 IC1B NORM 4 IC2A AMP
+ 1 6 IC3B RY1
7 + 2 5 IC4A IC4B IC3A 4 + 8
5 + 3 + 7 3 5 3 11 +
2 6 + 1 + 7 + 1 13
INPUT 1 REV 2 6 2 IC9
+ 3
10
6
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, 6
HIGH CUT A.N.I.C
VR2 IC8 IC5
+ 0.1
L
Q29, 31
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/MONO 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)
D2 D3 POWER
Q4 G R G R INDICATOR
7
10
A B C D E F G H I J
YST-SW325
1
I PRINTED CIRCUIT BOARD (Foil side) Lead Free Solder Used
MAIN (3) P. C. B.
HIGH CUT VOLUME
STANDBY/ON B.A.S.S. HIGH CUT FILTER
MAIN (8) P. C. B. OFF MOVIE PASS
ON MUSIC ON
POWER
INDICATOR
2
LEDR
E1
3 LEDG
MAIN (1) P. C. B.
LEDG
LEDR
E1
MAIN (2)
(CB1)
PWS
VCC
AUT
+V1
4 E
PWS
VCC
+15
-15
AUT
E
MA
SIG
E
AUT
MAIN (10)
+15 (W3)
-15
MAIN (4) P. C. B.
MAIN (10)
5 (W7A) OUTPUT / INPUT 1 INPUT 2 PHASE
NORM REV
BASE
PWS
CUR
VCC
OUT
AUT
+15
-V2
-15
· Semiconductor Location
Ref. no. Location Ref. no. Location
D2 B2 IC1 F6
6 D3 B2 IC2 H6
D6 C4 IC3 H3
D10 B4 IC4 F3
D16 C6 Q4 C4
D17 C6 Q10 B5
D19 C6 Q11 C5
D20 C6 Q18 C6
D32 C5 Q19 C6
SIG
+B
E
-B
D36 B6 Q23 C5
E D37 C6 Q28 C5
AUT
MAIN (10) (W6A) +15
-15
Circuit No. U, C, J R, L T, K, B, G A
L4, 5 X X O X
7 C82 X X O X
J33, 106 O O X O
11
A B C D E F G H I J K
YST-SW325
· Semiconductor Location
Ref. no. Location Ref. no. Location Ref. no. Location Ref. no. Location Ref. no. Location
I PRINTED CIRCUIT BOARD (Foil side) Lead Free Solder Used
1 Circuit No. U, C, J R, L T, K, B, G A D1 B4 D21 I6 D30 I5 IC9 K3 Q29 J4
C25 X O X X D4 B5 D22 I2 D31 I5 Q1 B5 Q30 I3
R46 X O X X D5 B4 D23 I5 D33 I5 Q2 B5 Q31 I3
D4 X O X X D7 J5 D24 I2 D34 J2 Q3 B5 Q32 K2
Q1 X O X X D9 J5 D25 I5 D35 H3 Q5 J4 Q33 K5
Q2 X O X X D12 J4 D26 I2 IC5 I2 Q6 J4 Q34 H3
C27 X O X X D13 J4 D27 I3 IC6 B6 Q9 B6
C28 O X O O D15 J4 D28 I3 IC7 B6 Q24A I5
U, C, R, A, B, G, J models R52 O X O O D18 H6 D29 I5 IC8 A5 Q24C I3
MAIN (2) P. C. B.
MAIN (5) P. C. B. MAIN (7) P. C. B. MAIN (6) P. C. B. 1 9
2
POWER
OFF
BE ON DRIVER
BE WH
GY RE
13
OR
3
MAIN (1)
TRANSFORMER
GY
WH (W7B)
OR
POWER
BASE
PWS
CUR
VCC
OUT
AUT
+15
-V2
-15
GY
PWS
VCC
+15
-15
AUT
E
MA
WH
4
MAIN (3)
(CB3)
R, T, K, L models
1
MAIN (1)
MAIN (1)
MAIN (7) P. C. B. MAIN (6) P. C. B.
(W6B)
(W1)
5
AUT
PWS
MAIN (9) P. C. B.
VCC R, L models +B
+V1 E
E BE
-B
BR BE YE GY
BE
AUTO GY
STANDBY
TRANSFORMER
VOLTAGE SELECTOR
6 POWER
OFF
LOW BR
HIGH
YE
WH
R72
add 10 k-ohms
7 CONFIRMATION OF MAIN (10) P. C. B.
AUTO STANDBY OPERATION
12
A B C D E F G H I J K L
YST-SW325
SCHEMATIC DIAGRAM
1
POWER AMP