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YST-SW105
SUBWOOFER SYSTEM
YST-SW105 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.
YST-SW105
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 .......................................... 1 CONFIRMATION OF AUTO STANDBY OPERATION ...... 4
SPECIFICATIONS .......................................................... 1 BLOCK DIAGRAM ......................................................... 4
INTERNAL VIEW ........................................................... 2 PRINTED CIRCUIT BOARD ...................................... 5~7
REAR PANELS .............................................................. 2 SCHEMATIC DIAGRAM ................................................ 8
DISASSEMBLY PROCEDURES ................................... 3 PARTS LIST ............................................................. 9~15
100766
P.O.Box 1, Hamamatsu, Japan
YST-SW105
s 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
q Meter impedance should be equivalent to 1500 ohm shunted TABLE
by 0.15µF.
q Leakage current must not exceed 0.5mA.
q 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.
s SPECIFICATIONS
Type .......... Advanced Yamaha Active Servo Technology Weight ........................................... 9.5 kg (20 lbs. 15 oz.)
Output Power ................ 100 W/100 Hz, 5 10% T.H.D. Finish
Input Sensitivity (50 Hz, 100 W/5, L+R) All models ........................... Black color / Cherry color
INPUT 1 (SP) ....................................................... 1.4 V Accessory .............................................. Nonskid Pad x 4
INPUT 2 (PJ) ...................................................... 65 mV
Input Impedance U ........ U.S.A. model C .... Canada model
INPUT 1 (SP) ..................................................... 2.2 k G ........ Europe model B .... British model
INPUT 2 (PJ) ....................................................... 12 k A ........ Australia model R .... General model
Frequency Response ............................... 30 Hz200Hz T ........ China model
Driver Unit .............................................. 20 cm (8") cone
magnetic shielding type x 1 Specifications are subject to change without notice due
Input Section to product improvements.
INPUT 1 ............................................. Speaker terminal
INPUT 2 ................................................... RCA pin jack · DIMENSIONS
Power Supply
U, C models ........................................ AC120V, 60Hz
A model ............................................... AC240V, 50Hz
365 (14-7/20")
B, G models ........................................ AC230V, 50Hz
R, T models ............... AC110/120/220/240V, 50/60Hz
Power Consumption ............................................... 80 W
Standby Power Consumption .............................. 0.8 W
Dimensions (W x H x D) ................ 235 x 365 x 312 mm
(9-5/16" x 14-7/20" x 12-1/4")
235 (9-5/16") 32 260 (10-1/4") 20
(1-1/4") 312 (12-1/4") (3/4")
Unit : mm (inch)
1
YST-SW105
s INTERNAL VIEW
1 MAIN P. C. B. (4)
1 2 MAIN P. C. B. (3)
2 3 MAIN P. C. B. (1)
4 MAIN P. C. B. (2)
5 Power Transformer
3
4
5
Right side internal view
s REAR PANELS
U, C models R model A model
B, G model T model
2
YST-SW105
s DISASSEMBLY PROCEDURES
(Remove parts in the order as numbered.)
q For exchanging the driver unit
1. Removal of Front Grille
The front grille is fixed to the cabinet with dowels at 4 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
Fig. 1
and the cabinet (bottom side first), push up the front grille. (Fig. 1)
c. Remove the front grille by lifting it up. (Fig. 1)
2. Removal of Driver unit
a. Remove 4 screws (1) in Fig. 2, and remove the Driver unit.
b. Remove the cable cord.
q 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. 1 Fig. 2
2. Removal of Rear Panel
Remove 12 screws (3) in Fig. 4, and remove the rear panel. At
Front Panel Ass'y
this time, disconnect the connector CB3 of MAIN P.C.B. (1). Main P.C.B. (4)
* When removing the rear panel, replace the packing.
3. P.C.B. Operation Check
a. Disconnect the connector CB9 of MAIN P.C.B. (4). 2
b. Connect the connector CB3 of MAIN P.C.B. (1) and CB9 of MAIN
P.C.B. (4) by using an extension flexible flat cable. (Fig. 4) 2 Fig. 3
Extension flexible flat cable : V7113100 (9P, 450 mm)
3
q Installation of power switch Extension flexible flat cable 3
Rapid cures bond (such as 5 minutes epoxy) is required to fix the
power switch. 3
As shown in Fig. 5, apply rapid cures bond (such as 5 minutes
epoxy) to the power switch (the area which contacts the rear CB9 CB3
panel), insert it in the rear panel and make sure it is fixed.
(Inserting the power switch in the rear panel only would not be 3
sufficient for its secure installation.)
q Precaution for installation of power cord
After connecting the power cord, be sure to apply the rapid cures
bond (such as 5 minutes epoxy) to the cord stopper as shown in
Fig. 6.
Fig. 4
Glue List
Place Name
Cord stopper 5 minutes epoxy or 2051 (Revertex Finewaters Apply rapid cures bond Apply rapid cures bond
SDN.BHD.) or VYLOK 917DH (National Starch &
Chemical (M) SDM.BHD.)
Power switch 5 minutes epoxy or Diabond 1620B
Fig. 5 Fig. 6
3
YST-SW105
s CONFIRMATION OF AUTO STANDBY OPERATION
Setting 4) Set the AUTO STANDBY switch to the HIGH position.
1) Turn off the power switch. AUTO
2) In order to shorten the time required for operation STANDBY
check; connect a 10k resistor at both ends of R60 on OFF
LOW
HIGH
the MAIN P.C.B. (2).
3) Connect the output signal from the signal generator to
the INPUT 2 of the unit. 5) Turn on the STANDBY/ON switch.
4) Set the signal generator for the sine wave of 100Hz, The display LED lights up (green) and its color remains
8mV. unchanged even after time have elapsed.
5) Turn on the power switch. 6) Turn off the STANDBY/ON switch.
The display LED goes off.
Confirmation
1) Set the AUTO STANDBY switch to the LOW position. After confirmation
AUTO 1) Turn off the power switch.
STANDBY 2) Disconnect the 10k resistor connected to both ends of
OFF
LOW
HIGH R60.
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.
s BLOCK DIAGRAM
+
VR3
L VOLUME
IC1A
2 IC1B L.P.F
- 1 6 IC7A
- + - 7 6 IC7B
6dB/oct
SPEAKER
+ - 8 4
3 - 2 2
INPUT 1 5 + 14 RY1
L.P.F 7 3 + IC2
+15 + +
6dB/oct L.P.F H.P.F
C17 C18 3
- 12dB/oct 12dB/oct
POWER
AMP A.N.I.C
R
MUSIC
+ Q16, 18 IC6, 8
MOVIE BASS Q20 0.1
SW4
HIGH
CUT
VR2
LIMITER
+
Q5, 6, 7, 8
D4,D5
L
D6
4
- IC3
OUTPUT PROTECTION
-
+B
POWER SUPPLY POWER
R D2 SW5
F1 RY2
+15 Q9
+
8
4 REGULATOR
TIMER 3
-15 Q10
R60 IC5
L
6 -B
INPUT 2 7
Q11
R SUB
POWER SUPPLY
R, T ONLY D11
AUTO STANDBY/ON
REGULATOR REGULATOR T1
STANDBY + SW1
H SW2 MUSIC C46 Q13, 14
IC12
SENSOR D15
L IC4 Q12
D9 D17
OFF
AUTO POWER ON/OFF CIRCUIT
D18
Q15
4
A B C D E
YST-SW105
1
s PRINTED CIUCUIT BOARD (Foil side)
MAIN P. C. B. (1)
From MAIN (6)
RE
RE
2 BL
VCC
E From MAIN (2)
PWS
+V1
VCC
3 PWS
-15
+15
+V2
BASS
1
MAIN
E
TOVL
To MAIN (4)
1
-15
+15
+15
TOVL
E
E
From MAIN (3)
8
1
4
15
9
SP+ SPEAKER
SP-
+
9
5
MAIN P. C. B. (4) MAIN P. C. B. (5)
POWER
VOLUME HIGH CUT B.A.S.S. STANDBY / ON SW5
6
OR
GY
9 1
7
BASS
TOVL
MAIN
PWS
VCC
+V2
+15
-15
E
From MAIN (1) To MAIN (2)
5
A B C D E
YST-SW105
1
s PRINTED CIUCUIT BOARD (Foil side)
From MAIN (3) From MAIN (7) (R, T models)
From MAIN (8) (J, U, C, A, B, G models)
MAIN P. C. B. (2) R60 To MAIN (1)
SWH2
SWH1
1M
PWS
SWL
VCC
+V1
SO
E
E
2
WH
BE
8 1 9 1
3
OR
GY
4
From MAIN (5)
From MAIN (2)
MAIN P. C. B. (3) To MAIN (1)
TOVL
+15
+15
-15
E
E
5
SWL
SWH2 8 1
SWH1
SO
E
6
HIGH LOW OFF
AUTO
STANDBY
INPUT 2
7 + +
OUTPUT / INPUT 1
6
A B C D E
YST-SW105
1
s PRINTED CIUCUIT BOARD (Foil side)
MAIN P. C. B. (7) MAIN P. C. B. (6) MAIN P. C. B. (9) (R, T models)
(R, T models)
WH POWER TRANSFORMER
GR
RE RE
2 YE
BL RE
BL
YE
BR
BR
GR RE
BL
BE
3 BE
VOLTAGE SELECTOR
BE
To MAIN (7)
To MAIN (1)
From MAIN (9)
4
MAIN P. C. B. (8) MAIN P. C. B. (6)
(J, U, C, A, B, G models)
POWER TRANSFORMER
WH RE
5
BL
BE RE
6
To MAIN (1)
From MAIN (2)
7
7
A B C D E F G H I J K L
YST-SW105
SCHEMATIC DIAGRAM
1
14.8
0
45.6
0
14.1 IC2 : TDA7293V
0 14.7
100W DMOS Audio Amp.
0.4
14.7
45.6
16.1
0 +Vs BUFFER DRV +PWVs
0
7 11 13
0.7 0 2
IN-
14
0 0 OUT
-45.7
3
IN+
0
12 BOOT
0
11.3
12.6
2 4 LOADER
SGND
6 BOOT
-45.7
STRAP
10 5
MUTE THERMAL S/C CLIP DET
MUTE
SHUTDOWN PROTECTION
9 STBY
STBY
0 1 8 15
14.8
14.0
0 11.4 STBY-GND -Vs -PWVs
0 0 0
0
-14.4 0
0 0
0
0
0
0
0
0 0 0
3 -14.4
0 0
14.7
0
0
-1.8
0
IC1 : NJM4558L
OP Amp. 3.3