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SUBWOOFER SYSTEM




YST-RSW300
YST-RSW300 SERVICE MANUAL




Status indicator




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
REAR PANELS .......................................................... 3­4 PRINTED CIRCUIT BOARDS ................................ 11­12
SPECIFICATIONS ...................................................... 4­5 SCHEMATIC DIAGRAM .............................................. 13
INTERNAL VIEW ........................................................... 5 REPLACEMENT PARTS LIST .............................. 15­19
DISASSEMBLY PROCEDURES ............................... 6­7
CHECKS AND ADJUSTMENTS ................................ 8­9




101052 2007 All rights reserved.
This manual is copyrighted by YAMAHA and may not be copied or
redistributed either in print or electronically without permission.
P.O.Box 1, Hamamatsu, Japan
'07.04
YST-RSW300



I TO SERVICE PERSONNEL AC LEAKAGE
1. Critical Components Information WALL EQUIPMENT TESTER OR
OUTLET UNDER TEST EQUIVALENT
YST-RSW300




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
that all exposed conductive surfaces are properly insulated
INSULATING
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.


For U model
"CAUTION"
"F1: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 6A,
125V FUSE."

For C model
CAUTION
F1: REPLACE WITH SAME TYPE 6A, 125V FUSE.
ATTENTION
F1: UTILISER UN FUSIBLE DE RECHANGE DE MÉME TYPE DE 6A, 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.




About lead free solder
All of the P.C.B.s installed in this unit and solder joints are soldered using the lead free solder.
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:
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
YST-RSW300



I REAR PANELS




YST-RSW300
U, C models R model




K model A model




3
YST-RSW300
YST-RSW300




B, G models L model




I SPECIFICATIONS
Type ....... Advanced Yamaha Active Servo Technology II Power Supply
Output Power (100 Hz, 5 ohms, 10% T.H.D.) ...... 250 W U, C models ........................................ AC 120 V, 60 Hz
R, L models ........ AC 110/120/220/230-240 V, 50/60 Hz
Dynamic Power (5 ohms) ...................................... 270 W
K model ............................................... AC 220 V, 60 Hz
Input Sensitivity (50 Hz, 250 W/5 ohms, L+R) A model ............................................... AC 240 V, 50 Hz
INPUT1 (SP) .......................................................... 1.0 V B, G models ........................................ AC 230 V, 50 Hz
INPUT2 (PJ) ......................................................... 50 mV
Power Consumption ............................................... 80 W
Input Impedance
Standby Power Consumption
INPUT1 (SP) ................................................ 2.2 k-ohms
................................................. 0.5 W (Reference data)
INPUT2 (PJ) .................................................. 12 k-ohms
Dimensions (W x H x D)
Frequency Response ........................... 20 Hz to 160 Hz
..... 372 x 400 x 428.2 mm (14-5/8" x 15-3/4" x 16-7/8")
Driver ........................................ 25 cm (10") cone woofer,
Weight ............................................... 20 kg (44 lbs. 1oz.)
Magnetic shielding type
Finish
Input Section
Cherry color .................... U, C, R, K, A, B, G, L models
INPUT1 ............................................... Speaker terminal
Black color ...................... U, C, R, K, A, B, G, L models
INPUT2 ..................................................... RCA pin jack
Accessories ........................................... Nonskid pad x 4
Operation Section
Front panel ....................................... STANDBY/ON key
* Specifications are subject to change without notice due to prod-
VOLUME control
uct improvements.
HIGH CUT control
Status indicator U ........... U.S.A. model C ........... Canadian model
Rear panel .................................. POWER ON/OFF key R ........... General model K ........... Korean model
AUTO STANDBY (HIGH / LOW / OFF) key A ........... Australian model B ........... British model
G ........... European model L ........... Singapore model
PHASE (NORM / REV) key
VOLTAGE SELECTOR key (R, L models)




4
YST-RSW300




YST-RSW300
· DIMENSIONS




400 (15-314")
29.6 26.6
(1-3/16") (1-1/16")
372 (14-5/8")
372 (14-5/8") 428.2 (16-7/8")

Unit: mm (inch)




Advanced YST II
Advanced Yamaha Active Servo Technology II is a
unique system to let the speaker unit have a perfectly
linear motion by the speaker and amplifier combination.




I INTERNAL VIEW

1 2 3 45 6 1 MAIN (8) P.C.B.
2 MAIN (4) P.C.B.
3 MAIN (2) P.C.B.
4 MAIN (1) P.C.B.
5 MAIN (10) P.C.B.
6 MAIN (3) P.C.B.
7 MAIN (6) P.C.B.
8 POWER TRANSFORMER
9 MAIN (11) P.C.B.
(U, C, K, A, B, G models)
MAIN (7) P.C.B.
(R, L models)
0 MAIN (9) P.C.B.
(R, L models)
A MAIN (5) P.C.B.




A 0 9 8 7




5
YST-RSW300



I DISASSEMBLY PROCEDURES
YST-RSW300




(Remove parts in the order as numbered.)
Disconnect the power cable from the AC outlet.
Spread a rubber sheet and cloth, then place the main unit upside down on it.

1. Removal of Front Grille Ass'y 2. Removal of Driver
* The front grille ass'y is fixed to the cabinet with dow- a. Remove 4 screws (1)and then remove the driver.
els at 5 locations. (Fig. 1)
As a flatblade screwdriver is used for removal, use b. Disconnect the connector connected to the terminal of
special care not to cause damage to the cabinet the driver. (Fig. 1)
ass'y.
a. Using the flatblade screwdriver inserted in the gap be-
tween the front grille ass'y and the cabinet ass'y (bot-
tom side first), push up the front grille ass'y. (Fig. 1)
b. Remove the front grille ass'y by lifting a metalblade up.
(Fig. 1)
* When installing the front grille ass'y, apply quick-dry-
ing bond or the like to dowels and then fit them into
dowel holes for secure installation. (The front grille
ass'y will come off easily if its dowels are fitted into
dowel holes without applying quickdrying bond or
the like.)


Bottom side




Cabinet ass'y




Driver


Front grille ass'y
1




Rubber sheet and cloth
Connector
Terminal
Terminal




Dowels
Flatblade screwdriver

Bottom side



Metalblade




Dowels


6 Fig. 1
YST-RSW300




3. Removal of Rear Panel Ass'y
Front panel
a. Remove 8 screws (2). (Fig. 2) d. Remove 2 screws (3). (Fig. 2) Knob hole
* Screws (2) are identified with arrow marks ( ). * Screws (3) are identified with arrow marks ( ).
CB9
b. Pull out the rear panel ass'y together with the cover. e. Remove the cover. (Fig. 2)
Cable
(Fig. 2) f. Disconnect the connectors (CB9 and CB10). (Fig. 2)
Bush
c. Remove bush. (Fig. 2) Switch cover ass'y
* The bush once removed cannot be reused. Be sure
to use a new bush for replacement. L-shaped metal part
or the like


Front panel
5
Bottom side Knob 4


Fig. 3

Cover
Bush




When Checking the P.C.B.:
to CB10 · Connect all the connectors removed during disassem-
to CB4 bly back to the original positions.
2
· Spread cloth first and place the rear panel ass'y and
switch cover ass'y on it. (Fig. 4)



3




Rubber sheet and cloth
to CB9
3



2

Fig. 2 Switch cover ass'y




4. Removal of Front Panel Ass'y
* The front panel once removed cannot be reused. c. Remove 2 screws (5). (Fig. 3)
Be sure to use a new front panel for replacement. d. Pull out the switch cover ass'y. (Fig. 3)
Before installing the new front panel, be sure to remove e. Remove bush. (Fig. 3) Rear panel ass'y
Rubber sheet and cloth
the double sided adhesive tape remaining from the old * The bush once removed cannot be reused. Be sure
front panel completely. to use a new bush for replacement.
Fig. 4
a. Remove 2 knobs (4). (Fig. 3) f. Remove the switch cover ass'y together with the cable/
b. Insert L-shaped metal parts or the like into the volume CB9. (Fig. 3)
knob hole and high-cut knob hole in the front panel and
pull the panel gradually away from the cabinet to re-
move it.


7
YST-RSW300



I CHECKS AND ADJUSTMENTS
G Confirmation of power amplifier operation
For the power amplifier which has been repaired, it is absolutely necessary to confirm that a correct waveform is obtained G Idling adjustment
at points indicated by A and B in the schematic diagram according to the following procedure. 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.
Devices required Setting Confirm that the voltage across the terminals TP1 and TP2 is 20 mV to 350 mV.
Signal generator 1) Set the signal generator to the sine wave, 100 Hz If it exceeds 350 mV, open (cut off) R136.
8-ohm or 6-ohm load resistor and minimum output level settings.
Oscilloscope (dual trace type) 2) Set the volume of the main unit to the minimum po- Attention:
sition. If the idling current exceeds 350 mV after a power amplifier repair, check for a defective component before cutting the
Connection resistor.
3) Turn on the power to the main unit.
1) Connect the output signal from the signal genera-
4) Adjust the output level of the signal generator and MAIN (1) P.C.B.
tor to the input terminal of the main unit.
the volume of the main unit so that the output level
2) Disconnect the connector terminal connected to
observed at oscilloscope CH2 is 26 Vp-p to 28 Vp-p.
the speaker unit and reconnect it to the load resis- R136
tor. Waveform observation
3) Connect the HOT side of the oscilloscope CH1 With the settings made as described above, observe
probe to the point A or B indicated in the figure and the waveform obtained at CH1 for judgment.
the GND side to the GND of the main unit. (Fig. 1) PS AMP
POWER
4) Connect the oscilloscope CH2 input to the red side DRIVE A
PS
of the connector cable, which is connected with the AMP
load resistor. D29
At this time, the GND terminal of CH2 must be left
unconnected.
D30
DRIVER
Point A (Cathode of D29/D30) Point B (Anode of D27/D28) WOOFER
D28
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 TP2 PS AMP
D27
PS
POWER AMP B
DRIVE
26-28 Vp-p
DC 20 mV to 350 mV
TP1




26-28 Vp-p




TP2
B A

TP1 GND
DC 20 mV to 350 mV




D28
D27


D29
D30
R136




Fig. 1
8
YST-RSW300




G Confirmation of AUTO STANDBY operation setting
1) Turn off the "POWER ON/OFF" key located on the rear panel.
2) In order to shorten the time required for operation check; connect a 10 k-ohms resistor at both ends of R45 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 main unit.
4) Set the signal generator for the sine wave of 100 Hz, 8 mV.
5) Turn on the "POWER ON/OFF" key located on the rear panel.

Confirmation
1) Set the "AUTO STANDBY" key to the LOW posi- 4) Set the "AUTO STANDBY" key to the HIGH posi-
tion. tion.




2) Turn on the "STANDBY/ON" key. 5) Turn on the "STANDBY/ON" key.
The status indicator lights up (green) and its color The status indicator lights up (green) and its color
changes to red after 2 to 8 seconds. remains unchanged even after time have elapsed.
3) Turn off the "STANDBY/ON" key. 6) Turn off the "STANDBY/ON" key.
The status indicator goes off. The status indicator goes off.

After confirmation
1) Turn off the "POWER ON/OFF" key.
2) Disconnect the 10 k-ohms resistor connected to both ends of R45.




R45

10 k-ohms

10 k-ohms

R45




9
A B C D E F G H I J
YST-RSW300


1
I BLOCK DIAGRAM
+ SW1 VR1
PHASE VOLUME +B
L IC11A SELECT PRE DRIVE POWER DRIVE
3 IC11B NORM IC10A DRIVER
1 6 7 IC7A Q3-15 Q17A, Q17C PS AMP Q22C, Q24A
­ 7 8 6 IC7B WOOFER
5 6 + 8 4 RY1
2 7 + 2
3 ­
INPUT 1 REV +
+ 5k-ohms + ­
L.P.F. L.P.F. H.P.F.
2 R 6dB/oct 12dB/oct 12dB/oct
PS AMP Q22A, Q24C
­
-B


HIGH CUT A.N.I.C.
40-140Hz IC8
VR2
+ 0.1

L
­ LIMITER
Q10, Q12
3
OUTPUT
AUTO STANDBY
+ SW2 8
OFF
R 4
­ LOW TIMER 3
Q16, Q19 Q26-28
IC201
HIGH 6
PROTECTION
7
POWER SUPPLY POWER
MUSIC + D25
L/ C27 TRANSFORMER
SENSOR
4 MONO OFF IC4 +B
+
INPUT 2 LOW
Q1 C76

R +
HIGH C77
PROTECTION
D202 -B
Q30-33 POWER ON/OFF
POWER SUPPLY RY2 SW5
AUTO STANDBY CIRCUIT D2 F1
IC6
+12
+ +




REGULATOR
C45 C40
5 AC IN
+ +
C46 C41
-12
IC1
D203


R60
Q13 (U, C, K, A, B, G models)


RY2 SUB
POWER SUPPLY
6 D3
T1
REGULATOR REGULATOR
IC202 Q5, Q8
STANDBY/ON
SW4 (R, L models)




STATUS
D201
INDICATOR
7 G R




10
A B C D E F G H I J
YST-RSW300


1
I PRINTED CIRCUIT BOARDS

MAIN (3) P.C.B. MAIN (10) P.C.B.

MAIN (4) (CB4) MAIN (2) (W1)




TOVL




TOVL
MAIN




MAIN
PWS




PWS




OCD
VCC




VCC
RY+
+V2




+V1




+V1
+12




+12




+12
RY-
-12




-12




-12
SP
E




E




E




E




E
CB9 CB3 CB1
W2
2




TOVL
PWS
IC10




+V1



+12
-12
E
9 1
W3
REV
PHASE


NORM




Ref no. Location
Q4 F6
BE
Q6 F6
HIGH




4 5 W6A1
Q7 F6 BL
3
STANDBY




IC201
IC201
AUTO




Q9 F6 IC1
LOW




IC6
W6A2
IN COM OUT COM IN OUT BE
Q10 E5
OFF




1 8
Q11 G6 W6A3
Q12 E5
Q14 G6 MAIN (6)
(W6B1, W6B2, W6B3)
Q15 F6
L /MONO / R
INPUT 2




Q16 I2
Q17A E4
PJ1
PJ1




Q17C H4
Q19 I2
4 Q20 F4 MAIN (1) P.C.B.
9 IC4 1 Q21 G5
Q22A F5
Q22C H5
Q24A G4
+




(W5B1, W5B2, W5B3)
Q24C F4
L




Q26 G3




MAIN (6)
Q27 G3
INPUT1/OUTPUT

-