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SUBWOOFER SYSTEM
YST-SW315 SERVICE MANUAL
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,
YST-SW315
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 ADJUSTMENTS / 8~10
SPECIFICATIONS / ........................................ 3 PRINTED CIRCUIT BOARD .................................. 11~12
INTERNAL VIEW ........................................................... 3 SCHEMATIC DIAGRAM .............................................. 13
BLOCK DIAGRAM ......................................................... 4 PARTS LIST ........................................................... 15~23
REAR PANELS .......................................................... 4~5
DISASSEMBLY PROCEDURES ............. 6~7
100855
P.O.Box 1, Hamamatsu, Japan
YST-SW315
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 6A, 125V FUSE."
CAUTION
F1: REPLACE WITH SAME TYPE 6A, 125V FUSE.
ATTENTION
F1: UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 6A, 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-SW315
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-SW315
s SPECIFICATIONS /
Type / Advanced Yamaha Active Servo Technology Weight / 19 kg (41 lbs. 14 oz.)
Output Power / 250 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, 250 W / 5 , L + R) Black Color ...................................... U, C, A, B, G, R, T, J models
INPUT2 (PJ) ........................... 50 mV (50 Hz, 250 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 / 20 Hz to 160 Hz * Specifications are subject to change without notice due to product
improvements.
Driver / 10" (25 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
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)
350(13-3/4") 382(15-7/16") 27
Power Supply /
355(14") (1-1/16")
U, C models ........................................................ AC 120 V, 60 Hz
A model ............................................................... AC 240 V, 50 Hz
B, G models ........................................................ AC 230 V, 50 Hz
350(13-3/4")
YST-SW315
R, T, K models ................... AC 240 / 220 / 120 / 110 V, 50/60 Hz
430(16-15/16")
J model .......................................................... AC 100 V, 50/60 Hz
Power Consumption /
U, C, A, B, G, R, T, K models ............................................... 80 W
J model ................................................................................ 100 W
Standby Power Consumption / 0.5 W
(3-1/8")
Dimension / (W x H x D) ................... 350 x 430 x 382 mm
80
(13-3/4" x 16-15/16" x 15-1/16")
Unit: mm (inch)
s INTERNAL VIEW
1 2 3 4 5 6
1 MAIN (8) P.C.B.
2 MAIN (4) P.C.B.
3 MAIN (2) P.C.B.
4 MAIN (10) P.C.B.
5 MAIN (3) P.C.B.
6 MAIN (1) P.C.B.
7 MAIN (5) P.C.B.
8 MAIN (11) P.C.B.
9 POWER TRANSFORMER
0 MAIN (6) P.C.B.
7 8 9 0
3
YST-SW315
s BLOCK DIAGRAM
+ VR1 +B
SW1 PRE DRIVE
PHASE VOLUME Q2--10 POWER DRIVE
L IC11A SELECT
Q1C, 17C, 24A DRIVER
Q28, 29 Q16A/C, 26A/C PS AMP Q27, 31
3 IC11B IC10A B.P.F.
1 6 7 IC7A RY1
7 8 6 IC7B Q201--204
5 6 + 8 4 IC10B
2 7 + 2 4
INPUT 1 3 + 2
3
+
L.P.F. L.P.F. H.P.F. Q1A, 17A, 24C
12dB/oct PS AMP
R 6dB/oct 12dB/oct B.A.S.S. Q30, 32
SELECT
+ SW3 B
HIGH CUT A.N.I.C
VR2 IC8
Q25
+ D12, 13, 19 0.1
L
LIMITER
Q18--21
D6, 14, 33, 34
OUTPUT
8
OFF
R 4
L TIMER 3 Q37, 38 IC3
+ R252
IC201 D36 Q22, 23
H 6
PROTECTION
AUTO STANDBY 7
SW2 POWER SUPPLY
MUSIC + D1
L SENSOR C227
OFF IC4 +B
INPUT 2 Q205
L
R
H AUTO POWER
ON/OFF CIRCUIT B
POWER SUPPLY RY2
D2 F1
+12 IC6
POWER
REGULATOR
SW5
12 IC1
Q209
SUB
YST-SW315
POWER SUPPLY
D11
T1
REGULATOR REGULATOR
IC202 Q207, 208
STANDBY/ON D203
D9 D202
SW4
(R, T, K models only)
D201
Q206
s REAR PANELS
U, C models A model
4
YST-SW315
B, G models R model
T model K model
YST-SW315
J model
5
YST-SW315
s DISASSEMBLY PROCEDURE
(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
YST-SW315
Driver
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 disconnect the
connector (CB4). (Fig. 2)
Front Panel Ass'y
CB4
3
3
Fig. 2
6
YST-SW315
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)
c. Remove 2 screws (5). (Fig. 3)
* Screws (5) are identified with arrow marks ( ).
d. Remove the cover. (Fig. 3)
e. Disconnect the connectors (CB9 and CB10). (Fig. 3)
to CB4
to CB9
4
to CB10
5
YST-SW315
5
4
Fig. 3
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)
Note:
Replace this Bush (V7324600) with the new
article when remove the Rear Panel Ass'y.
Rubber Sheet and Cloth
Fig. 4
7
YST-SW315
s ADJUSTMENTS /
q 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 andA 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-SW315
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.
Normal
Point A (Cathode of D29)
V : 20V/div H : 2 msec/div
DC range 1 : 1 probe
Abnormal
+B or GND level
0V
Becomes constant
Normal
Point B (Anode of D31)
V : 20 V/div H : 2 msec/div
DC range 1 : 1 probe
Abnormal
0V
-B or GND level
Becomes constant
8
YST-SW315
q Idling Adjustment
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 TP11 and
TP12 is 10 mV to 200 mV.
If it exceeds 200 mV, open (cut off) R172.
q 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 R252 on
the MAIN (3) P.C.B. (Refer to page 11)
3) Connect the output signal from the signal generator to
the INPUT 2 / L/MONO terminal of the unit.
4) Set the signal generator for the sine wave of 100Hz,
8mV.
5) Turn on the power switch located on the rear panel.
Confirmation
1) Set the AUTO STANDBY switch to the LOW position.
YST-SW315
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.
2) Disconnect the 10k resistor connected to both ends of
R252.
9
YST-SW315
Schematic Diagram /
POWER DRIVE PS AMP
A
DRIVER
B
YST-SW315
IDLING CURRENT DC 10 mV
ADJ to
200 mV
Test Points /
MAIN (1) P.C.B.
Point A Point B
D29 D31
TP11 (+)
TP12 (-)
DC 10 mV to 200 mV
MAIN (2) P.C.B.
Idling Current Adjustment
R172
10
A B C D E F G H I J
YST-SW315
1
s PRINTED CIRCUIT BOARD (Foil side)
· Semiconductor Location
Ref. No. Location Ref. No. Location
D1 J6 Q1C H5
D2 J3 Q2 H3 MAIN (4) P.C.B. MAIN (2) P.C.B.
MAIN (10) P.C.B.
BASS
BASS
TOVL
TOVL
MAIN
PWS
PWS
VCC
VCC
MA2
MA1
D3 H3 Q3 H3
+V2
+V1
+V1
+12
+12
LIM
-12
-12
E
E
E
D4 H2 Q4 H3
D5 H3 Q5 H3
D6 F3 Q6 H3
2 D7 E6 Q7 H3
D9 I2 Q8 H3
D12 E3 Q9 G5
D13 F3 Q10 G3 MAIN (3) P.C.B.
D14 F3 Q16A F5
D15 H6 Q16C H5
TR-C
TR-E
TR-B
D19 E3 Q17A G5
D20 G2 Q17C H5
D21 F6 Q18 F2
D22 G3 Q19 F2 BE
D23 G6 Q20 F3 CONFIRMATION OF
AUTO STANDBY
3 D24 H6 Q21 F3 OPERATION
BL
R
D25 G3 Q22 H6 R252 BE
D26 G3 Q23 H6 add 10k
INPUT1/OUTPUT
D27 G7 Q24A G6
+B1
D28 G6 Q24C F6
-B1
E
D29 G6 Q25 F3
D30 F6 Q26A F7
DR2+
DR1+
AVST
DR1-
DR2-
OUT
D31 F6 Q26C G7
-V
D32 F6 Q27 H2 MAIN (6) P.C.B.
D33 F6 Q28 H2
D34 F3 Q29 G3
4
D36 I2 Q30 G3
L
IC1 I3 Q31 G6
IC3 H7 Q32 F6
IC4 B5 Q37 I2 MAIN (1) P.C.B.
IC6 I3 Q38 I2
IC8 E2 Q201 B7
MAIN (6) P.C.B.
IC10 C6 Q202 B6
INPUT2
IC11 B4 Q203 B7
IC201 B5 Q204 B7
Q1A F5 Q205 C6
5
OFF
STANDBY
AUTO
LOW
HIGH
TR-C
TR-E
TR-B
+B1
-B1
E
RE
NORM
PHASE
BASS
TOVL
PWS
MA2
MA1
BL
+V1
+12
LIM
-12
E
6
REV
RE
DRIVER
+
7
DR2+
DR1+
AVST
DR1-
DR2-
OUT
-V
11
A B C D E F G H I J
YST-SW315
1
s PRINTED CIRCUIT BOARD (Foil side)
MAIN (2) P.C.B. MAIN (5) P.C.B. MAIN (4) P.C.B. MAIN (10) P.C.B. MAIN (8) P.C.B.
BASS
TOVL
MAIN
PWS
VCC
+V2
+12
-12
E
OR STANDBY/ON
LEDG
LEDR
E1
BE
2 AC POWER
LEDG
LEDR
E1
GY
OR B.A.S.S. STANDBY/ON
VOLUME HIGH CUT
GY 10 0 150Hz 50Hz MOVIE
MUSIC · Semiconductor Location
WH
3 Ref. No. Location
D11 B2
D201 I2
D202 H2
D203 B2
D204 B2
VCC
+V1
IC7 G2
E
IC202 B3
MAIN (10) P.C.B. Q206 H2
Q207 B2
J, U, C, A, B, G models Q208 A2
4 Q209 B2
R, T, K models
MAIN (11) P.C.B. MAIN (7) P.C.B.
BE WH BE BE GR BR YE BL RE WH
MAIN (9) P.C.B.
5
GR
YE
RE
BR
6
BE BL
RE BL RE BE BL BE RE BL RE BE BL BE VOLTAGE
SELECTOR
MAIN (1) P.C.B. MAIN (10) P.C.B. MAIN (1) P.C.B. MAIN (10) P.C.B.
7 MAIN (6) P.C.B. MAIN (6) P.C.B.
12
A B C D E F G H