YST-SW320 ■ CONTENTS TO SERVICE PERSONNEL . . . . . . . . . . . . . . . . . . . . 1 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 REAR PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 DISASSEMBLY PROCEDURES . . . . . . . . . . . . . . . 3–4 ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–6 PRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . . . 7–12 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . 14 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15–22 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. IMPORTANT NOTICE 100720 SERVICE MANUAL YST-SW320 SUBWOOFER SYSTEM
23
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Audio | Video - YST-SW320 · 2006. 2. 20. · YST-SW320 YST-SW320 5 ADJUSTMENTS Idling Adjustment To stabilize operation of the amplifier, turn ON the power with no input signal and
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This manual has been provided for the use of authorized YAMAHARetailers and their service personnel.It has been assumed that basic service procedures inherent to the industry,and more specifically YAMAHA Products, are already known andunderstood by the users, and have therefore not been restated.
WARNING: Failure to follow appropriate service and safetyprocedures when servicing this product may result inpersonal injury, destruction of expensive components,and failure of the product to perform as specified. Forthese reasons, we advise all YAMAHA product ownersthat any service required should be performed by anauthorized YAMAHA Retailer or the appointed servicerepresentative.
IMPORTANT: The presentation or sale of this manual to any individualor firm does not constitute authorization, certificationor recognition of any applicable technicalcapabilities, or establish a principle-agent relationshipof 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 departmentsof YAMAHA are continually striving to improve YAMAHA products.Modifications are, therefore, inevitable and specifications are subject tochange without notice or obligation to retrofit. Should any discrepancyappear to exist, please contact the distributor's Service Division.
WARNING: Static discharges can destroy expensive components.Discharge any static electricity your body may haveaccumulated by grounding yourself to the ground bussin the unit (heavy gauge black wires connect to thisbuss).
IMPORTANT: Turn the unit OFF during disassembly and partreplacement. Recheck all work before you apply powerto the unit.
IMPORTANT NOTICE
1 0 0 7 2 0
SERVICE MANUAL
YST-SW320SUBWOOFER SYSTEM
YST-SW320Y
ST
-SW
32
0
TO SERVICE PERSONNEL
1. Critical Components InformationComponents having special characteristics are marked Zand must be replaced with parts having specifications equalto those originally installed.
2. Leakage Current Measurement (For 120V Models Only)When service has been completed, it is imperative to verifythat all exposed conductive surfaces are properly insulatedfrom supply circuits.
Meter impedance should be equivalent to 1500 ohm shuntedby 0.15µF.
AC LEAKAGETESTER OREQUIVALENT
EQUIPMENTUNDER TEST
INSULATINGTABLE
WALLOUTLET
WARNING: CHEMICAL CONTENT NOTICE!The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/orplastic (where applicable) components may also contain traces of chemicals found by the California Health andWelfare 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 FORANY REASON WHATSOEVER!
Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumesor expose eyes to solder/flux vapor!
If you come in contact with solder or components located inside the enclosure of this product, wash your handsbefore handling food.
1
Leakage current must not exceed 0.5mA.
Be sure to test for leakage with the AC plug in bothpolarities.
SPECIFICATIONS
Type . . . . . . . . . Advanced Yamaha Active Servo Technology
Driver . . . . . . . . . . . 25 cm (9-13/16") cone woofer (JA25600)Magnetically shielded type
* Specifications subject to change without notice.
U . . . . . . . . . . USA modelC . . . . . . Canadian modelA . . . . . Australian modelB . . . . . . . . British modelG . . . . . European modelR . . . . . . . General modelT . . . . . . . . . China model
YST-SW320Y
ST
-SW
32
0
REAR PANEL
U, C models A model
B, G models
R model T model
2
R, T models only
YST-SW320Y
ST
-SW
32
0
DISASSEMBLY PROCEDURES(Remove parts in the order as numbered.)
1. Removal of Front Panel Ass'yRemove 4 screws ( q ) and then remove the FrontPanel Ass'y in Fig. 1.
* Use an Allen wrench (3mm) to unscrew the FrontPanel Ass'y.
Fig. 2
Fig. 1
* When assembling the Rear Panel, check to ensure that
the gasket is not damaged so as to prevent air leakage
from occurring.
Fig. 3
3
2. Removal of Loud Speakera. Remove 8 screws ( w ) and then remove the Base
Ass'y in Fig. 2.b. Remove 4 screws ( e ) and then remove the Loud
Speaker in Fig. 2.
3. Removal of Rear Panel Ass'yRemove 12 screws ( r ) in Fig. 3.
* Arrow marks ( ) are printed to identify the screws to be
removed.
Installation of emblem1. Put the emblem into the cabinet at the specified posi-
tion.
2. Place a piece of cloth/wood on top of the emblem.
3. Using a mallet, hammer the emblem in place through
the cloth/wood.* Use special care not to cause damage to the emblem or
cabinet while hammering the emblem.
q
q
Front Panel Ass'y
Main (5) P.C.B.
w
w
w
w
ee
Loud Speaker
Base Ass'y
r
r
r
Rear Panel Ass'y
r
YST-SW320Y
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32
0
Glue List
Place Name
Cord stopper 5 minute epoxy or
2051(Revertex Finewaters SDN.BHD.) or
VYLOK 917DH (National Starch &
Chemical (M) SDM.BHD.)
Power switch 5 minute epoxy or Diabond 1620B
4
370 (14-9/16") 228340 (13-3/8")
432
(17"
)340
(13-
3/8"
)
340 (13-3/8") (5/16") (7/8")
Installation of power switchRapid cures bond (such as 5 minute epoxy) is required to fix the power switch.
As shown in Fig. A, apply rapid cures bond (such as 5 minute epoxy) to the power switch (the area which
contacts the rear 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 sufficient for its secure installation.)
Precaution for installation of power cordAfter connecting the power cord, be sure to apply the rapid cures bond (such as 5 minute epoxy) to the
cord stopper as shown in Fig. A,
Bond application diagram (Fig. A)
Dimensions
Units : mm (inch)
Apply rapid cures bond
Apply rapid cures bond
YST-SW320Y
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-SW
32
0
5
ADJUSTMENTS
Idling AdjustmentTo stabilize operation of the amplifier, turn ON thepower with no input signal and wait for 1 or 2 minutesin non loaded condition before the adjustment.Adjust VR1 so that the voltage between terminalsTP11 and TP12 is DC 50mV to 250mV.
Point A (Cathode of D29)V : 20V/div H : 2 msec/divDC range 1 : 1 probe
0V
Point B (Anode of D30)V : 20V/div H : 2 msec/divDC range 1 : 1 probe
0V
Confirmation of Power Amp operationFor the power amplifier which has been repaired, itis absolutely necessary to confirm that a correctwaveform is obtained at points indicated by A and Bin the schematic diagram according to the followingprocedure.
Devices requiredSignal generator8Ω or 6Ω load resistorOscilloscope (dual trace type)
Connection1) Connect the output signal from the signal generator
to the input terminal of YST-SW320.2) 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 theGND side to the GND of the main unit.
4) Connect the oscilloscope CH2 input to the red sideof the connector cable, which is connected with theload resistor.At this time, the GND terminal of CH2 must be leftunconnected.
Setting1) Set the signal generator to the sine wave, 100Hz and
minimum output level settings.2) Set the volume of YST-SW320 to the minimum
position.3) Turn on the power to YST-SW320.4) Adjust the output level of the signal generator and the
volume of YST-SW320 so that the output levelobserved at oscilloscope CH2 is 28Vp-p.
Waveform observationWith the settings made as described above, observethe waveform obtained at CH1 for judgment.
Normal Normal
Abnormal+B or GND levelBecomes constant
Abnormal-B or GND levelBecomes constant
Confirmation of AUTO STANDBY
Measuring Condition
R60 = 1MΩ
1MΩ//10kΩ
F = 100Hz
Input Level = 4mV
Load = Open
Rating
After 2 to 8 sec.
STANDBY
(LED become red)
Don't STANDBY
Remarks
VOLUME: MAX
HIGH CUT: MAX
AUTO STANDBY: LOW
VOLUME: MAX
HIGH CUT: MAX
AUTO STANDBY: HIGH
YST-SW320Y
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32
0
6
IDLING CURRENT ADJ.
DC 50mV to 250mV
A
B
RE
WH
Main (1) P.C.B
DC 50mV to 250mV
TP11 (+)
TP12 (-)
VR1
D30D29
Point A Point B
Schematic Diagram
Test Points
A B C D E
1
2
3
4
5
6
7
YST-SW320
PRINTED CIRCUIT BOARD (Foil side)
7
81
FROM : MAIN (2)
RE
WH
W19
W20
TO : SPEAKER
+V1AYSTDR–OUTDR+
–B1
E +B
1
RE
BL
RE
W7
W6
W5
TO : MAIN (6)
FROM : MAIN (2)
IDLING CURRENT ADJ.
Q16
C
Q1C
Q9
Q1A
Q17
CQ
17A
Q16
A
MAIN ( 1 ) P. C. B.
A
B
DC 50mV to 250mV
IDLING TEST POINT
A B C D E
1
2
3
4
5
6
7
YST-SW320
PRINTED CIRCUIT BOARD (Foil side)
8
9 1
9 1
BE
BL
BE
W16
W15
W14
TO : MAIN (6)
TO
: M
AIN
(1)
DR
+O
UT
DR
—A
YS
T+
V1
#17
W17
TO
: M
AIN
(3)
VC
CV
CC E E
PW
S+
V1
#2
W2
FR
OM
: M
AIN
(4)
MA1E
TOVL+12—12LIM
MA2
FR
OM
: M
AIN
(5)
TVOLE
MAIN+V2+12—12
PWSVCC
+B
1E —
B1 #1
8
W18
TO
: M
AIN
(1)
MAIN ( 2 ) P. C. B.
A B C D E
1
2
3
4
5
6
7
YST-SW320
PRINTED CIRCUIT BOARD (Foil side)
9
8
91
1
MA
IN (
3 )
P. C
. B.
MA
IN (
7 )
P. C
. B.
FR
OM
: M
AIN
(2)
+V1PWSEEVCCVCC
FR
OM
: M
AIN
(4)
SWLSWH2SWH1SO
R
, T m
od
els
W11
GR
W10
BR
TO
: V
OLT
AG
E S
ELE
CT
OR
OR
W12
GY
W13
TO
: M
AIN
(8)
W9
BE
GY
BL
OR
WH
BE
RE
W8
RE
TO
: P
OW
ER
CO
RD
TO
: P
OW
ER
TR
AN
SF
OR
ME
R
TO
: V
OLT
AG
E
S
ELE
CT
OR
A B C D E
1
2
3
4
5
6
7
YST-SW320
PRINTED CIRCUIT BOARD (Foil side)
10
81
91
MA
IN (
3 )
P. C
. B.
MA
IN (
7 )
P. C
. B.
OR
W12
BE
W
9
WH
W
8
GY
W13
TO
: M
AIN
(8)
FR
OM
: P
OW
ER
CO
RD
TO
: P
OW
ER
TR
AN
SF
OR
ME
R
FR
OM
: M
AIN
(2)
+V1PWSEEVCCVCC
FR
OM
: M
AIN
(4)
SWLSWH2SWH1SO
U
, C, A
, B, G
mo
del
s
A B C D E
1
2
3
4
5
6
7
YST-SW320
91
18
BASS PHASE AUTOSTANDBY
INPUT2
R L+ – – +
OUTPUTINPUT 1
MA2LIM–12+12
TOVLE
MA1
TO : MAIN (2)#1
W1
SW
LS
WH
2S
WH
1S
O
TO : MAIN (3)#4
W4
MAIN ( 4 ) P. C. B.
R, T, B, G ONLY
9 1
FROM : MAIN (2)
TOV
L EM
AIN
+V
2+
12 –12
PW
SV
CC
VOLUME HIGHCUT
SATNDBY/ON
MAIN ( 5 ) P. C. B.
11
PRINTED CIRCUIT BOARD (Foil side)
A B C D E
1
2
3
4
5
6
7
YST-SW320
W7
W6
W5
W14
W15
W16
FROM : POWER TRANSFORMER
RE
BL
RE
BE
BL
BE
TO : MAIN (2)
TO : MAIN (1)
MAIN ( 6 ) P. C. B.
W12
W13
OR
GY
TO : MAIN (3)
MAIN ( 8 ) P. C. B.
POWER
12
PRINTED CIRCUIT BOARD (Foil side)
A B C D E
1
2
3
4
5
6
7
YST-SW320
IC11
AIC
11B
IC7A
AU
TO S
TAN
DB
YS
W3
AU
TO P
OW
ER
O
N/O
FF
CIR
CU
IT
VR
3V
OLU
ME
L.P.
F.6d
B/o
ct
B.P
.FQ
33—
36
L.P.
F.12
dB/o
ct
36
1
57
68
IC7B
IC3
Q22
, 23
42
D8
D17
D9
D18
Q15
2
HIG
H C
UT
VR
2
PR
OT
EC
TIO
N
H/L
OF
F
PW
R
R60 C45
TIM
ER
IC5
MU
SIC
SE
NS
OR
IC4
8 4 6
3
7
Q12
PW
R
RE
GU
LATO
R
IC12
Q11
L R
+ – – +
INP
UT
1
L R
INP
UT
2
L R
+ – – +
OU
TP
UT
IC1A
4 32
SW
2P
HA
SE
SE
LEC
T
IC1B
L.P.
F.12
dB/o
ct
68
BA
SS
SE
LEC
TS
W4
+–
PR
E D
RIV
EQ
2—8,
10
PO
WE
R D
RIV
EQ
9, 1
6A/C
, 26A
/C,
Q28
, 29
A.N
.I.C
LIM
ITE
R
RY
1
IC8,
9Q
25D
12, 1
3, 1
9
Q18
—21
D6,
14,
33,
34
0.1
SP
EA
KE
R
Q1C
, 17C
, 24A
Q27
, 31
PS
AM
P
Q1A
, 17A
, 24C
Q30
, 32
PS
AM
P
–B+B
H.P
.F.
12dB
/oct
++
+12 –12
REGULATOR
PO
WE
R S
UP
PLY
D2
IC6
IC10
F1
PO
WE
R
SW
5
+B
–B
PO
WE
R S
UP
PLY
D1
STA
ND
BY
/ON
SW
1
R, T
ON
LYR
EG
ULA
TOR
Q13
, 14
D15
SU
B
PO
WE
R S
UP
PLY
D11
RY
2
T1
+
BLOCK DIAGRAM
13
A B C D E F G H
1
2
3
4
5
6
I J K
7
8
YST-SW320
SCHEMATIC DIAGRAM
VO1
2
–Vm1
3
+Vm1
4
VEE
5
+Vm2
6
–Vm2
7
VO2
8
VCC
9
VCC
1
1
– + –+
2
IC1, 4, 7—9 : µPC4570HADual OP-Amp
IC5 : M51848LCR Timer
* All voltage are measured with a 10MΩ/V DC electric volt meter.* Components having special characteristics are marked Z and
must be replaced with parts having specifications equal to thoseoriginally installed.
* Schematic diagram is subject to change without notice.
Z F1 KB001660 FUSE T1.6A 250V(ABG)Z F1 KB001660 FUSE T1.6A 250V(BG)Z F1 V5279400 FUSE 6A 250V(RT)Z F1 V5279400 FUSE 6A 250V(UCRT)Z F2 KB001660 FUSE T1.6A 250V(RT)
IC1 XB247301 IC uPC4570HAIC3 XF663A00 IC uPC1237HAIC4 XB247301 IC uPC4570HAIC5 XP741A00 IC M51848LIC6 XJ602A00 IC NJM78M12FAIC7 XB247301 IC uPC4570HAIC8 XB247301 IC uPC4570HAIC9 XB247301 IC uPC4570HAIC10 XD343A00 IC NJM79M12FAIC11 XM922A00 IC NJM4558LIC12 iG160100 IC NJM78L08A 8VL1 V5058100 COIL 120uHL2 V5058100 COIL 120uHL3 VR906600 COIL 0.95uH