Panasonic SB-WA340 User manual

ORDERNO. MD0310441C2
ActiveSubwooferSystem
SB-WA340EBS1
Colour
(S1)...SilverType
1

SPECIFICATIONS
Specification
Activesubwoofer
Type 1way, 1speakersystem, bass-
ref.
Woofer 17 cm conetype
Impedance 4
Outputsound pressurelevel 80 dB/W (1.0m)
Frequencyrange 40 Hz-220 Hz(-16 dB)
45 Hz-180 Hz(-10 dB)
Dimensions(W xHxD) 160 x450 x424 mm
Mass Approx. 12 kg
General
Powersupply AC230-240 V, 50 Hz
Powerconsumption 250 W
Powerconsumption in standby
mode 0.7W
Note:
Specificationsaresubjectto changewithoutnotice.
Mass and dimensionsareapproximate.
System :SC-HT1000EBS MusicCenter:SA-HT1000EBS
Frontspeakers:SB-PF1000P-S (x2)
Centerspeaker:SB-PC1000P-S (x1)
Surround speakers:SB-PS1000P-S (x2)
ActiveSubwoofer:SB-WA340EBS1
System :SC-HT1000EGS MusicCenter:SA-HT1000EGS
Frontspeakers:SB-PF1000P-S (x2)
Centerspeaker:SB-PC1000P-S (x1)
Surround speakers:SB-PS1000P-S (x2)
ActiveSubwoofer:SB-WA340EBS1
1. SafetyPrecautions
1.1. GENERALGUIDELINES
2

1. Whenservicing, observetheoriginal leaddress. Ifashortcircuit
isfound, replace all parts whichhavebeenoverheatedor
damagedbytheshortcircuit.
2. Afterservicing, see toitthat all theprotectivedevices suchas
insulation barriers, insulation papersshieldsareproperlyinstalled.
3. Afterservicing, make thefollowing leakagecurrentchecks to
preventthecustomerfrombeing exposedtoshock hazards.
1.1.1. LEAKAGE CURRENTCOLDCHECK
1. Unplug theACcordand connect ajumperbetweenthetwoprongs
on theplug.
2. Measuretheresistance value, withanohmmeter, betweenthe
jumperedACplug and eachexposedmetalliccabinet parton the
equipmentsuchas screwheads, connectors, control shafts, etc.
Whentheexposedmetallicparthas areturnpathtothechassis,
thereading shouldbebetween1M and 5.2 . / Whenthe
exposedmetal does nothaveareturnpathtothechassis, the
reading must be . Fig. 1
1.1.2. LEAKAGE CURRENTHOTCHECK (See Figure1.)
1. Plug theACcorddirectlyintotheACoutlet. Donotuse an
isolation transformerforthischeck.
2. Connect a1.5k , 10 watts resistor, inparallel witha0.15 F
capacitors, betweeneachexposedmetallicparton theset and a
good earthground suchas awaterpipe, as showninFigure1.
3. Use anACvoltmeter, with1000 ohms/voltormoresensitivity, to
measurethepotential across theresistor.
4. Check eachexposedmetallicpart, and measurethevoltageat
3

eachpoint.
5. Reverse theACplug intheACoutlet and repeat eachoftheabove
measurements.
6. Thepotential at anypointshouldnotexceed0.75 volts RMS. A
leakagecurrenttester(Simpson Model 229 orequivalent) maybe
usedtomake thehotchecks, leakagecurrentmust notexceed1/2
milliamp. Incase ameasurementisoutsideofthelimits specified,
thereisapossibilityofashock hazard, and theequipmentshould
berepairedand recheckedbeforeitisreturnedtothecustomer.
2. Handling the Lead-free Solder
2.1. Aboutleadfree solder(PbF)
Distinction ofPbF P.C.B. :
P.C.B.s(manufactured)using leadfree solderwill have aPbF stampon theP.C.B.
Caution:
-Pbfree solderhas ahighermelting pointthat standardsolder;
Typicallythemelting pointis50 -70°F(30 -40°C)higher. / Please
use ahigh temperaturesoldering iron. Incase ofthesoldering iron
withtemperaturecontrol, please set itto700 ±20°F(370 ±10°C).
-Pbfree solderwill tend tosplashwhenheatedtoo high (about
1100°F/600°C).
-Whensoldering orunsoldering, please completelyremoveall ofthe
solderon thepinsorsolderarea, and besuretoheat thesoldering
points withthePbfree solderuntil itmelts enough.
3. BeforeRepairand Adjustment
DisconnectACpower, dischargePowerSupplyCapacitorsC546, C547, C548, C549 through a10
, 1Wresistor toground.
DONOTSHORT-CIRCUITDIRECTLY(withascrewdriverblade, for instance), as thismay destroy
solidstatedevices.
Afterrepairsarecompleted, restorepowergraduallyusing avariac, toavoidovercurrent.
Currentconsumption atAC230-240V, 50HzinNOSIGNALmodeshouldbe~500 mA.
4. Protection Circuitry
Theprotection circuitrymay have operatedifeitherofthefollowing conditionsarenoticed:
-Nosound isheardwhenthepoweristurnedon.
-Sound stopsduring aperformance.
Thefunction ofthiscircuitryistopreventcircuitrydamageif, for example, thepositive and
negative speakerconnection wires are
“shorted”, or ifspeakersystemswithanimpedance less thantheindicatedratedimpedance of
4

theamplifierareused.
Ifthisoccurs, followtheprocedureoutlines below:
1. Turnoff thepower.
2. Determinethecause oftheproblemand correct it.
3. Turnon thepoweronce againafteroneminute.
Note:
Whentheprotection circuitryfunctions, theunitwill notoperateunless thepowerisfirstturned
off and thenon again.
5. Connection of the SpeakerCables
-Besuretoconnect speakercables beforeconnecting theACpower
supplycord.
-Theloadimpedance ofanyspeakerusedwiththisunitmust be4 .
-Besuretoconnect thecablefromtherightspeakertotheright
terminal and thecablefromtheleft speakertotheleft terminal.
1. Stripoff theoutercovering, and twist thecenterconductor. Make
surethebareendsofthewires arenotunravelled. (Iftheyare,
twist themtightagain.)
2. Insertthewiretotherearpanel oftheunitand close thelever.
Notes :
-To preventdamagetocircuitry, nevershort-circuitpositive(+)and
negative(-) speakerwires.
-Besuretoconnect onlypositive(red)wires topositive(+)terminals
and negative(black) wires tonegative(-) terminals.
6. DisassemblyProcedure
“ATTENTIONSERVICER”
5

Somechassiscomponentsmay have sharp edges.
Becareful whendisassembling and servicing.
1. Thissection describes procedures forchecking theoperation of
themajorprintedcircuitboardsand replacing themain
components.
2. Forreassemblyafteroperation checks orreplacement, reverse the
respectiveprocedures.
Special reassemblyprocedures aredescribedonlywhenrequired.
3. Select itemsfromthefollowing index whenchecks orreplacement
arerequired.
Contents
-DisassemblyoftheSpeakerUnit
-MainComponentReplacementProcedures
6.1. DisassemblyoftheSpeakerUnit
Step1:Remove 2screwsfrom therearpanel.
6

Step2:Remove all screws.
Step3:Remove theStand Base.
Step4:Remove all screwsfrom thespeakerbottom.
Step5:Pull thePower/AmpUnitas shown.
7

Step6:Release theconnector CN506 and pull outthePower/AmpUnit.
Step7:PushtheNetFramefrom twoholes insidetheunit.
Step8:Remove theNetFrame.
Step9:Remove all thescrews.
8

Step10:Remove theSpeaker.
Step11 &12:Remove all thescrews.
Step13:Release theconnector CN507.
Step14:Remove the2screws.
9

Step15 &16:Remove all thescrews.
Step17:Place thePowerPCB as shownfor checking.
Checking for ACInletPCB.
6.2. MainComponentReplacementProcedures
10