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SUBWOOFER SYSTEM
YST-SW205/305 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, 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.
YST-SW205 YST-SW305
I CONTENTS YST-SW205/305
TO SERVICE PERSONNEL .......................................... 1 ADJUSTMENTS .............................................................. 7~8
SPECIFICATIONS .......................................................... 2 BLOCK DIAGRAM ......................................................... 9
INTERNAL VIEW ........................................................... 3 PRINTED CIRCUIT BOARD .................................. 10~15
REAR PANELS .......................................................... 4~5 SCHEMATIC DIAGRAM ........................................ 16~17
DISASSEMBLY PROCEDURES ................................... 6 PARTS LIST ........................................................... 18~31
100768
P.O.Box 1, Hamamatsu, Japan
YST-SW205/305
I TO SERVICE PERSONNEL
1. Critical Components Information AC LEAKAGE
Components having special characteristics are marked s WALL EQUIPMENT TESTER OR
and must be replaced with parts having specifications equal OUTLET UNDER TEST EQUIVALENT
to those originally installed.
2. Leakage Current Measurement (For 120V Models Only)
When service has been completed, it is imperative to verify
that all exposed conductive surfaces are properly insulated
from supply circuits.
INSULATING
G Meter impedance should be equivalent to 1500 ohm shunted TABLE
by 0.15µF.
G Leakage current must not exceed 0.5mA.
G Be sure to test for leakage with the AC plug in both polarities.
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.
YST-SW205/305
1
YST-SW205/305
I SPECIFICATIONS Specifications are subject to change without notice due to product improvements.
YST-SW205 YST-SW305
Type Advanced Yamaha Active Servo Technology
Output Power 150 W/100 Hz, 5 10% T.H.D. 200 W/100 Hz, 5 10% T.H.D.
Input Sensitivity
INPUT 1 (SP) 0.8 V (50 Hz, 150 W/5, L+R) 1.0 V (50 Hz, 200 W/5, L+R)
INPUT 2 (PJ) 40 mV (50 Hz, 150 W/5, L+R) 50 mV (50 Hz, 200 W/5, L+R)
Input Impedance
INPUT 1 (SP) 2.2 k
INPUT 2 (PJ) 12 k
Frequency Response 23 Hz ~ 170Hz 20 Hz ~ 160Hz
Driver Unit 20 cm (8") cone 20 cm (8") cone
magnetic shielding type x 1 magnetic shielding type x 2
Input Section
INPUT 1 Speaker terminal
INPUT 2 RCA pin jack
Power Supply
U, C models AC120V, 60Hz
A model AC240V, 50Hz
B, G models AC230V, 50Hz
R, T models AC110/120/220/240V, 50/60Hz
Power Consumption 70 W 80 W
Standby Power Consumption 0.8 W 0.8 W
Dimensions (W x H x D) 235 x 485 x 402 mm 235 x 585 x 445 mm
(9-5/16" x 19-1/16" x 15-13/16") (9-5/16" x 23" x 17-1/2")
Weight 15 kg (33 lbs. 1 oz.) 21 kg (48 lbs. 8 oz.)
Finish
All models Black color / Cherry color
Accessory Nonskid Pad x 4
U ....... U.S.A. model C ....... Canada model A ....... Australia model B ....... British model
G ....... Europe model R ....... General model T ........ China model
· DIMENSIONS
585 (23")
485 (19-1/16")
YST-SW205/305
235 (9-5/16") 32 351 (13-13/16") 19 235 (9-5/16") 32 394 (15-1/2") 19
(1-1/4") 402 (15-13/16") (3/4") (1-1/4") 445 (17-1/2") (3/4")
Unit : mm (inch)
YST-SW205 YST-SW305
2
YST-SW205/305
I INTERNAL VIEW
1
1
2 2
3 7 3 7
4 8 4
8
5 5
9 9
6 6
0 0
YST-SW205 YST-SW305
1 MAIN (5) P. C. B. 7 MAIN (1) P. C. B.
2 MAIN (4) P. C. B. 8 MAIN (2) P. C. B.
3 MAIN (10) P. C. B. 9 MAIN (6) P. C. B.
4 MAIN (3) P. C. B. 0 Power Transformer
5 MAIN (9) P. C. B. [R, T models only]
6 MAIN (8) P. C. B. [U, C, A, B, G models]
MAIN (7) P. C. B. [R, T models]
YST-SW205/305
3
YST-SW205/305
I REAR PANELS
YST-SW205
U, C models A model B, G model
70 WATTS
R model T model
YST-SW205/305
4
YST-SW205/305
YST-SW305
U, C models A model B, G model
80WATTS
80WATTS
R model T model
YST-SW205/305
5
YST-SW205/305
I DISASSEMBLY PROCEDURES
(Remove parts in the order as numbered.)
G For exchanging the driver unit
1. Removal of Front Grille
The front grille is fixed to the cabinet with dowels at 6 locations.
As a screwdriver (for slotted head screw) is used for removal, use
special care not to cause damage to the cabinet.
a. Apply the block to the rear panel so as to avoid damage to the
Terminal of the rear panel.
b. Use the screwdriver inserted in the gap between the front grille
and the cabinet (bottom side first), push up the front grille. (Fig. 1)
c. Remove the front grille by lifting it up. (Fig. 1)
Fig. 1
2. Removal of Driver unit
a. Remove 4 (8 when YST-SW305) screws (1) in Fig. 2, and
remove the Driver unit.
b. Remove the cable cord.
G For repairing P.C.B.
Repairing P.C.B. is possible without removing front grille.
1. Removal of Front Panel Ass'y
Remove 2 screws (2) and then remove the Front Panel Ass'y in
Fig. 3.
* Use an Allen wrench (3 mm) to unscrew the Front Panel Ass'y.
2. Removal of Rear Panel 1
Remove 4 screws (3) and 12 screws (4) in Fig. 4, and remove Fig. 2
the rear panel. At this time, disconnect the connector CB3 of
MAIN (2) P.C.B.
* When removing the rear panel, replace the packing.
3. P.C.B. Operation Check Front Panel Ass'y
a. Disconnect the connector CB9 of MAIN (5) P.C.B. Main (5) P.C.B.
b. Connect the connector CB3 of MAIN (2) P.C.B. and CB9 of MAIN
(5) P.C.B. by using an extension cable. (Fig. 4)
Extension cable : V7278000 (9P, 700 mm) 2 Fig. 3
2
44 4
3
YST-SW205/305
Extension cable CB3
4
3
CB9
4
4
Fig. 4
6
YST-SW205/305
I ADJUSTMENTS
G Confirmation of Power Amp operation G Idling Adjustment
For the power amplifier which has been repaired, it is To stabilize operation of the amplifier, turn ON the power
absolutely necessary to confirm that a correct waveform with no input signal and wait for 2 to 3 minutes in non loaded
is obtained at points indicated by A and B in the condition before the adjustment.
schematic diagram according to the following procedure. Adjust VR1 so that the voltage between terminals TP11 and
TP12 is 30mV to 200mV.
Devices required
Signal generator
G Confirmation of AUTO STANDBY operation
8 or 6 load resistor
Setting
Oscilloscope (dual trace type)
1) Turn off the power switch.
Connection 2) In order to shorten the time required for operation check;
1) Connect the output signal from the signal generator to the connect a 10k resistor at both ends of R60 on the MAIN
input terminal of the unit. (3) P.C.B.
2) Disconnect the connector terminal connected to the 3) Connect the output signal from the signal generator to the
speaker unit and reconnect it to the load resistor. L/MONO terminal of the unit.
3) Connect the HOT side of the oscilloscope CH1 probe to 4) Set the signal generator for the sine wave of 100Hz,
the point A or B indicated in the figure and the GND side 8mV.
to the GND of the main unit. 5) Turn on the power switch.
4) Connect the oscilloscope CH2 input to the red side of the
connector cable, which is connected with the load Confirmation
resistor. 1) Set the AUTO STANDBY switch to the LOW position.
At this time, the GND terminal of CH2 must be left AUTO
unconnected. STANDBY
OFF HIGH
Setting LOW
1) Set the signal generator to the sine wave, 100Hz and
minimum output level settings.
2) Turn on the STANDBY/ON switch.
2) Set the volume of the unit to the minimum position.
The display LED lights up (green) and its color changes
3) Turn on the power to the unit.
to red after 5 to 10 seconds.
4) Adjust the output level of the signal generator and the
3) Turn off the STANDBY/ON switch.
volume of the unit so that the output level observed at
The display LED goes off.
oscilloscope CH2 is 28Vp-p.
4) Set the AUTO STANDBY switch to the HIGH position.
Waveform observation AUTO
With the settings made as described above, observe the STANDBY
waveform obtained at CH1 for judgment. OFF
LOW
HIGH
Normal
Point A (Cathode of D29) 5) Turn on the STANDBY/ON switch.
V : 20V/div H : 2 msec/div The display LED lights up (green) and its color remains
DC range 1 : 1 probe unchanged even after time have elapsed.
6) Turn off the STANDBY/ON switch.
YST-SW205/305
The display LED goes off.
Abnormal
+B or GND level After confirmation
0V
Becomes constant 1) Turn off the power switch.
2) Disconnect the 10k resistor connected to both ends of
R60.
Normal
Point B (Anode of D31)
V : 20V/div H : 2 msec/div
DC range 1 : 1 probe
Abnormal
0V
-B or GND level
Becomes constant
7
YST-SW205/305
Schematic Diagram (Ex.: YST-SW205)
1.8
-1.0
-1.6
POWER DRIVE PS AMP
66.1 66.1
66.1
65.7 65.5 66.1
66.1 65.5
4.4 65.9 66.1 66.1
4.4 3.3 2.7 66.1
65.5 66.1
65.1
65.9 2.7
1.8 3.3 2.7
1.8
3.3
66.1 2.7
1.2 1.2 0
1.2 2.7 2.7
0.6
66.1
A
0.6 0.1
66.0
66.0 0
0.1
0.1
IDLING CURRENT ADJ.
0.1 DC 30 mV to 200 mV
-0.5
-0.5 -2.7
-1.0
-2.7
-1.0 -2.7 0
-1.6 -69.7
-1.6
-1.0
4.9
-66.7
-3.6 -3.3
-2.7
B
-4.2 -66.7
-2.7
-65.5 -3.6 -2.7
-66.7
-66.7
-4.2 -66.7 -66.7
-66.7 -66.0 -66.7
-66.3
-66.7 -66.7
Test Points (Ex.: YST-SW205)
Main (1) P.C.B.
Point A Point B
D29
D31
TP11 (+)
DC 30 mV to 200 mV
TP12 (-)
Main (2) P.C.B. YST-SW205/305
VR1
8
7
6
5
4
3
2
1
9
A
YST-SW305
+ VR3 +B
SW2 PRE DRIVE
PHASE VOLUME Q2--10 POWER DRIVE
L Q1C, 17C, 24A SPEAKER
IC11A SELECT Q27--30 Q16A/C, 26A/C PS AMP
3 IC11B IC1A B.P.F Q27, 31
1 6 4 IC7A Q33--36 RY1
7 6 2 IC7B
3 + 4
YST-SW205/305
5 8 IC1B
2 + 2 6
INPUT 1 + 8
+
SPEAKER
L.P.F. L.P.F. H.P.F. Q1A, 17A, 24C
12dB/oct PS AMP
R 6dB/oct 12dB/oct BASS L.P.F. Q30, 32
SELECT 12dB/oct
+ SW4 B
YST-SW205
HIGH CUT A.N.I.C
B
VR2 IC8, 9 SPEAKER
Q25
I BLOCK DIAGRAM
+ D12, 13, 19 0.1
L
LIMITER
Q18--21
D6, 14, 33, 34
OUTPUT
8
R PWR
4
D8
TIMER 3 IC3
+ R60
IC5 Q22, 23
6
PROTECTION
7
POWER SUPPLY
MUSIC
D1
L SENSOR C46
C
IC4 Q12 +B
INPUT 2
R
AUTO STANDBY AUTO POWER
SW3 ON/OFF CIRCUIT
H/L B
POWER SUPPLY RY2
D2 F1
OFF
+12 IC6
POWER
SW5
REGULATOR
12 IC10
D
Q11
SUB
POWER SUPPLY
R, T ONLY D11
T1
REGULATOR REGULATOR
PWR IC12 Q13, 14
STANDBY/ON D15
D9 D17
SW1
D18
E
Q15
A B C D E
YST-SW205/305
YST-SW205
1
I PRINTED CIUCUIT BOARD (Foil side)
MAIN (1) P. C. B. From MAIN (6)
RE
RE
BL
From
MAIN
(2)
2
+B1
-B1
E
3
1
Q16C
8
Q1C
Q17C
4 A
From
MAIN
(2)
Q9
B
TR-C
TR-E
TR-B
Q17A
5
IDLING TEST POINT
DC 30 mV to 200 mV
Q1A
From
MAIN
YST-SW205/305
(2)
Q16A
DR1+
DR2+
OUT
DR2-
6 DR1-
AYST
+V1
SP-
SP+
7 +
SPEAKER
10
A B C D E
YST-SW205/305
YST-SW305
1
I PRINTED CIUCUIT BOARD (Foil side)
MAIN (1) P. C. B. From MAIN (6)
RE
RE
BL
From
MAIN
(2)
2
+B1
-B1
E
3
1
Q16C
8
Q1C
Q17C
4 A
From
MAIN
(2)
Q9
B
TR-C
TR-E
TR-B
Q17A
5
IDLING TEST POINT
DC 30 mV to 200 mV
Q1A
From
MAIN
(2)
Q16A
DR1+
DR2+
OUT
DR2-
6 DR1-
AYST
+V1
SP-
SP+
7
SP+
SP-
+ +
SPEAKERS
11
A B C D E
YST-SW205/305
YST-SW205 YST-SW305
1
I PRINTED CIUCUIT BOARD (Foil side)
MAIN (2) P. C. B. From MAIN (6)
BE
BE
BL
2
VCC
E
E
PWS
+V1
To
From MAIN
+B1
-B1
E
3 MAIN (1)
(3)
4
TR-C
TR-B
TR-E
To MAIN (1)
5
IDLING CURRENT ADJ.
MA1
E
DR1+
DR2+
AYST
DR2-
DR1-
OUT
+V1
TOVL
BASS
YST-SW205/305
+12
-12
To
LIM
MA2
MAIN
(1)
6 From
MAIN
(4)
TOVL
E
MA1
BASS
+V2
1
1
+12
-12
PWS
VCC
7 To
MAIN
9
9
(5)
12
A B C D E
YST-SW205/305
YST-SW205 YST-SW305
1
I PRINTED CIUCUIT BOARD (Foil side)
To MAIN (10)
MAIN (3) P. C. B.
OR
GY
2
8 1 9 1
3
SWH2
SWH1
PWS
SWL
VCC
WH
+V1
BE
SO
E
E
To
To MAIN (4) MAIN U, C, A, B, G models: To
MAIN (8)
(2) R, T models: To MAIN (7)
4 MA2
LIM
-12
+12