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YST-SW005
SUBWOOFER SYSTEM
YST-SW005 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.
s CONTENTS
TO SERVICE PERSONNEL .......................................... 1 DISASSEMBLY PROCEDURES ................. 4
SPECIFICATIONS ........................................ 1 CONFIRMATION OF AUTO STANDBY
INTERNAL VIEW ...................................... 2 OPERATION 5
YST-SW005
BLOCK DIAGRAM ................. 2 PRINTED CIRCUIT BOARD .................... 6~7
REAR PANELS ......................................... 3 SCHEMATIC DIAGRAM .............................. 8
PARTS LIST ............................................... 9~15
100799
P.O.Box 1, Hamamatsu, Japan
YST-SW005
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 Power Consumption
U, C, R, T, K, A, B, G models ............................. 60 W
Output Power J model ................................................................ 32 W
J, U, C models ............ 55 W/100 Hz, 5 10% T.H.D. Standby Power Consumption ..... 0.8 W
R, T, K, A, B models ... 50 W/100 Hz, 5 10% T.H.D. Dimensions (W x H x D) ..... 200 x 365 x 375 mm
Input Sensitivity (100 Hz, 50 W/5, L+R) (7-7/8" x 14-3/8" x 14-3/4")
INPUT 1 (SP) ....................................................... 0.7 V Weight ................................ 8.5 kg (18 lbs. 12 oz.)
INPUT 2 (PJ) ...................................................... 30 mV Finish
Input Impedance Black color / Cherry color ......................... All models
INPUT 1 (SP) ..................................................... 2.2 k Silver color .............................................. U, C models
INPUT 2 (PJ) ....................................................... 12 k Accessory
Frequency Response U, C, R, T, K, A, B, G models ........... Nonskid Pad x 4
30 Hz200Hz J model
Driver ................ 16 cm (6.5") cone
magnetic shielding type
Input Section U ........ U.S.A. model C .... Canadian model
YST-SW005
INPUT 1 ............................................. Speaker terminal A ........ Australian model B .... British model
INPUT 2 ................................................... RCA pin jack G ........ European model R .... General model
Power Supply T ........ Chinese model K .... Korean model
J model ........................................... AC100V, 50/60Hz J ......... Japanese model
U, C models ........................................ AC120V, 60Hz
R, T, K models .......... AC110/120/220/240V, 50/60Hz Specifications are subject to change without notice due
A model ............................................... AC240V, 50Hz to product improvements.
B, G models ........................................ AC230V, 50Hz
1
YST-SW005
· DIMENSIONS
s INTERNAL VIEW
1 2 3 4
365 (14-3/8")
32
200 (7-7/8") (1-1/4") 335 (13-3/16") 8 (5/16")
375 (14-3/4")
Unit : mm (inch)
5 6 7 8
1 MAIN P. C. B. (3) 5 MAIN P. C. B. (4)
2 MAIN P. C. B. (2) 6 MAIN P. C. B. (5)
3 MAIN P. C. B. (1) 7 Power Transformer
4 MAIN P. C. B. (6) 8 Driver
s BLOCK DIAGRAM
+
HIGH
VR1 SW1
L VOLUME
IC1A LOW
2 IC1B
- 1 6 IC7A
L.P.F
- + - 7 5 IC7B
6dB/oct
SPEAKER
+ + 7 3
3 + 1 2
INPUT 1 5 - 10 RY1
L.P.F 6 2 - IC2
6dB/oct L.P.F H.P.F
12dB/oct 1
- 12dB/oct
POWER
AMP A.N.I.C
R
+ IC10, Q16
0.1
LIMITER
+
Q5, 6, 7, 8
D4,D5,D22,D23
L
D6
4
- IC3
OUTPUT PROTECTION
-
+B
POWER SUPPLY POWER
R D1 SW3
T2 F1 RY2
+15 Q9
+
8
4 REGULATOR
TIMER 3
-15 Q10
R60 IC5
YST-SW005
L
6 -B
INPUT 2 7
Q11
R SUB
POWER SUPPLY
AUTO R, T ONLY D11
STANDBY REGULATOR REGULATOR T1
Q12 +
H SW2 MUSIC C46 Q13, 14
IC9
SENSOR D16
L
IC4 D9 D15
OFF
AUTO POWER ON/OFF CIRCUIT
D17
Q15
2
YST-SW005
s REAR PANELS
J model U, C models R, T, K models
VOLUME VOLUME
0 10 0 10
AUTO HIGH AUTO HIGH
STANDBY HIGH CUT STANDBY HIGH CUT
LOW LOW
HIGH HIGH
LOW LOW
OFF OFF
R L
INPUT2 R L /MONO INPUT2 R L /MONO
R L
+ + + + + +
INPUT1 INPUT1
FROM AMPLIFIER R L FROM AMPLIFIER R L
OUTPUT OUTPUT
TO SPEAKERS
R L TO SPEAKERS
R L
+ + + + + +
MODEL NO. YST-SW005 POWER POWER
120 VOLTS 60 WATTS
60Hz ON ON
MODEL NO. YST-SW005
MODEL NO. YST-SW005
PS
E MADE IN CHINA 110 - 120/220 - 240 VOLTS
100 V 32 W 50/60Hz OFF 60 WATTS 50/60Hz OFF
SER. NO.
MADE IN CHINA
ATTENTION :RISQUE DE CHOC ELECTRIQUE SER. NO.
SER. NO. NE PAS OUVRIR.
WARNING :TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK. DO NOT EXPOSE
THIS APPLIANCE TO RAIN OR MOISTURE.
®
C US
110V-120V VOLTAGE
220V-240V SELECTOR
R model
A model B, G models
VOLUME VOLUME
0 10 0 10
AUTO HIGH AUTO HIGH
STANDBY HIGH CUT STANDBY HIGH CUT
LOW LOW
HIGH HIGH
LOW LOW
OFF OFF
INPUT2 R L /MONO INPUT2 R L /MONO
+ + + +
INPUT1 INPUT1
FROM AMPLIFIER R L FROM AMPLIFIER R L
OUTPUT OUTPUT
TO SPEAKERS
R L TO SPEAKERS
R L
+ + + +
MODEL NO. YST-SW005 POWER MODEL NO. YST-SW005 POWER
240 VOLTS 60 WATTS 230 VOLTS 60 WATTS
50Hz ON 50Hz ON
MADE IN CHINA MADE IN CHINA
SER. NO. OFF SER. NO. OFF
YST-SW005
N89
3
YST-SW005
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 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)
2. Removal of Driver unit and Replacement of LED
a. Remove 4 screws (1) in Fig. 2, and remove the Driver
unit.
b. Disconnect the cord connected to the Driver unit.
c. Remove 4 screws (2) and pull out the port section
forward. LED can then be replaced.
2
2
2 2
1
1
1
Fig. 1 1 Fig. 2
q For repairing P.C.B.
1. Removal of Rear Panel
Remove 14 screws (2) in Fig. 3, and remove the rear
panel. At this time, disconnect the connector CB5 of
MAIN P.C.B. (1).
* When reassembling the rear panel which has been
removed from the rear panel, be sure to replace the
packing to prevent the air leakage.
2. P.C.B. Operation Check
Connect the connector CB5 of MAIN P.C.B. (1).
YST-SW005
3
CB5
Fig. 3
4
YST-SW005
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) at the cord
stopper to prevent the air leakage as shown in Fig. 4.
Apply rapid cures bond
Glue List
Place Name
Cord stopper 5 minutes epoxy or 2051 (Revertex
Finewaters SDN.BHD.) or VYLOK 917DH
(National Starch & Chemical (M) SDM.BHD.)
Fig. 4
s CONFIRMATION OF AUTO
STANDBY OPERATION
Setting
1) Turn off the power switch.
2) In order to shorten the time required for operation
check; connect a 10k resistor at both ends of R60 on
the MAIN P.C.B. (1).
3) Connect the output signal from the signal generator to
the INPUT 2 of the unit.
4) Set the signal generator for the sine wave of 100Hz,
8mV.
5) Turn on the power switch.
Confirmation
1) Set the AUTO STANDBY switch to the LOW position.
AUTO
STANDBY
HIGH
LOW
OFF
2) Turn on the POWER switch.
The display LED lights up (green) and its color changes
to red after 5 to 10 seconds.
3) Turn off the POWER switch.
The display LED goes off.
4) Set the AUTO STANDBY switch to the HIGH position.
AUTO
STANDBY
HIGH
LOW
OFF
5) Turn on the POWER switch.
YST-SW005
The display LED lights up (green) and its color remains
unchanged even after time have elapsed.
6) Turn off the POWER switch.
The display LED goes off.
After confirmation
1) Turn off the power switch.
2) Disconnect the 10k resistor connected to both ends of
R60.
5
A B C D E
YST-SW005
1
s PRINTED CIRCUIT BOARD (Component side)
To MAIN (4)
BE
WH
MAIN P. C. B. (1)
VOLTAGE
SELECTOR
220V-240V
RE
YE
2 110V-120V
To MAIN (5)
R, T, K models
· Semiconductor Location
Ref. No. Location
Q5 C6
3 Q6 C6
Q7 C6
Q8 C6
Q9 C4
Q10 C5
Q11 B2
Q12 B5
Q13 B3
SUBO
From MAIN (5) E Q14 B3
Q15 B4
Q16 B7
D1 D4
4
D2 C4
D3 C5
D4 C6
E
D5 C6
To MAIN (6) +V2
D6 C6
+V1
D7 C7
D8 C7
AUTO STANDBY D9 B5
OPERATION D10 B2
D15 B4
R60 D16 B4
5 1k D19 B7
D20 B7
From MAIN (2) D21 B6
D22 C6
D23 C6
E
IC2 D6
SWL
SWH2 MAIN
IC3 C7
SWH1 +15
S0 -15
IC4 B6
IC5 B5
IC9 B4
From MAIN (2) IC10 B7
6
YST-SW005
WH
SPEAKER
7
RE
6
A B C D E
YST-SW005
1
s PRINTED CIRCUIT BOARD (Component side)
MAIN P. C. B. (6)
To MAIN (1)
E
+V2 From MAIN (1)
+V1
S0 -15
SWH1 +15
SWH2 MAIN
2 SWL
E
MAIN P. C. B. (3)
LOW
HIGH CUT
OFF LOW HIGH
HIGH
STANDBY
AUTO
3
VOLUME
INPUT2
From MAIN (1)
4
FROM AMPLIFIER
BE
WH
INPUT1
POWER
TO SPEAKERS
OUTPUT
MAIN P. C. B. (4)
5
MAIN P. C. B. (2)
SUBO
To MAIN (1) E
6
RE
From MAIN (1)
· Semiconductor Location
Ref. No. Location
D11 D6 YE
D17 C2
IC1 B4
IC7 D3 MAIN P. C. B. (5)
7
7
A B C D E F G H I J K L
YST-SW005
SCHEMATIC DIAGRAM
MAIN (2) MAIN (1)
1
POWER AMP.
14.3
0
0
0
0.1
0.1
0
-32.5
14.3
1.2
-1.2
0
-33.2
33.2
-14.3
2 LIMITTER
0 13.2
0 0
0 0 0 0
0
0
WH
0 0 0 0
3 -13.2
RE
PROTECTION
IC2 : STK404-050AF
AF Power Amp.
0 TR7
3.5
2.2
0.8
0
2.9
0
0
0
4