Panasonic SB-WA920PP User manual

ORDERNO. MD0403057C1
A6
ActiveSubwooferSystem
SB-WA920PP
Colour
(S)...SilverType
SPECIFICATIONS
Specification
1

Activesubwoofer
Type 1way, 1speakersystem (Bass
reflex)
Speakerunit Impedance 4
Woofer 20 cm (7-7/8”)Conetype
Outputsound pressure 84 dB/W (1.0m)
Frequencyrange 34 Hz-220 Hz(-16 dB)
38 Hz-190 Hz(-10 dB)
Dimensions(W xHxD) 285 x418 x475 mm
(11-7/32”x16-15/32”x18-11/16”)
Mass 15 kg (33 lb.)
General
Powerconsumption 390V
Powersupply AC120V, 60Hz
Note:
Specificationsaresubjectto changewithoutnotice.
Mass and dimensionsareapproximate.
SB-HT920P-S consistsof:
SB-PF920P-S x2, SB-PS920P-S x2and SB-PC920P-S x1
System :SC-HT920 (P) MusicCenter:SA-HT920 (P)
SatelliteSpeakers:SB-HT920 (P)
ActiveSubwoofer:SB-WA920 (PP)
System :SC-HT920 (PC) MusicCenter:SA-HT920 (PC)
SatelliteSpeakers:SB-HT920 (P)
ActiveSubwoofer:SB-WA920 (PP)
1. SafetyPrecautions
1.1. GENERALGUIDELINES
1. Whenservicing, observetheoriginal leaddress. Ifashortcircuit
isfound, replace all parts whichhavebeenoverheatedor
damagedbytheshortcircuit.
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2. Afterservicing, see toitthat all theprotectivedevices suchas
insulation barriers, insulation papersshieldsareproperlyinstalled.
3. Afterservicing, make thefollowing leakagecurrentchecks to
preventthecustomerfrombeing exposedtoshock hazards.
(This“SafetyPrecaution”isappliedonlyinU.S.A.)
1. Beforeservicing, unplug thepowercordtopreventanelectric
shock.
2. Whenreplacing parts, use onlymanufacturer’srecommended
components forsafety.
3. Check thecondition ofthepowercord. Replace ifwearordamage
isevident.
4. Afterservicing, besuretorestoretheleaddress, insulation
barriers, insulation papers, shields, etc.
5. Beforereturning theservicedequipmenttothecustomer, besure
tomake thefollowing insulation resistance test topreventthe
customerfrombeing exposedtoashock hazard.
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
3

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
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
4

, 1Wresistor toground.
DONOTSHORT-CIRCUITDIRECTLY(withascrewdriverblade, for instance), as thismay destroy
solidstatedevices.
Afterrepairsarecompleted, restorepowergraduallyusing avariac, toavoidovercurrent.
Currentconsumption atAC120V, 60HzinNOSIGNALmodeshouldbe~1000 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
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.
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Notes :
-To preventdamagetocircuitry, nevershort-circuitpositive(+)and
negative(-) speakerwires.
-Besuretoconnect onlypositive(Copper)wires topositive(+)
terminalsand negative(Silver)wires tonegative(-) terminals.
6. DisassemblyProcedure
“ATTENTIONSERVICER”
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
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-DisassemblyoftheSpeakerUnit
-MainComponentReplacementProcedures
6.1. Disassemblyflow chart
Thefollowing chartistheprocedurefor disassembling thecasing and insidepartsfor internal
inspection whencarrying outtheservicing.
Toassembletheunit, reverse thestepsshowninthechartbelow.
6.2. DisassemblyoftheSpeakerUnitand Checking oftheP.C.B.
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Step1:Remove all thescrews.
Step2:Remove thestand base.
Steps3&4:Remove all thescrewsfrom thebottom ofthespeakerunit.
Step5:Use theSteel Rulertoslotintotheholeofthebottom cabinetofspeaker.
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Step6:Use theWood ChiptoslotbetweentheNetFrameand theSteel Ruleras arrowshown.
Step7:Use theScrewdriverslightlylift up theNetFrameas arrowshown.
Step8:Take noteofthebosses whichgluedtotheunit.
-AssemblyofNet Frame.
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Cleanup all theglueatthe4Boss pointsand replace withthenormal glue.
Replace theNetFramefirmlyback intothecabinet.
Step9:Remove theNetFramefrom thecabinetofspeaker.
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Step10:Remove all thescrewsfrom thesubwoofer.
Step11:Remove thesubwooferbydetaching the2wires.
Step12:Remove thescrews.
Step13:Pull outthePowerAmpunitslightlyas shown.
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Step14:Release theconnector CN506 thenpull outtheentirePowerAmpunit.
Step15:Remove all thescrews.
Step16:Release theconnector CN507 toremove therearpanel.
Step17:Remove all thescrews.
Step18:Remove all thescrews.
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Step19:Remove all thescrews.
Step20:Detachtheconnector CN503 and remove thetransformer.
-Checking fortheTransformer, Amplifierand ACInlet P.C.B.
Step21:Place theTransformerP.C.B., AmplifierP.C.B. and theACInletP.C.B. as shownfor
checking.
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Steps22:Release theACInletP.C.B. as arrowshown.
-Checking forthePowerand CD OpenP.C.B.
Step23:Place thePowerP.C.B. and theCD OpenP.C.B. as shownfor checking.
6.3. MainComponentReplacementProcedures
6.3.1. ReplacementofthePowerICsand Transistors
Step1:DesolderthePowerICand Transistor terminals.
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Steps2&3:Remove thescrews.
Step4:ReplacementofthePowerIC601 and Transistors(Q601 &Q602).
Steps5:DesolderthePowerICand Transistor terminals.
Steps6&7:Remove thescrews.
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Step8:ReplacementofthePowerIC501 and Transistors(Q511 &Q512).
7. Connection of the SpeakerWiring
8. Block Diagram
9. SchematicDiagram
(All schematicdiagramsmay bemodifiedatanytimewiththedevelopmentofthenew
technology)
Note:
-Thevoltagevalueand waveformsarethereference voltageofthis
unitmeasuredbyDC electronicvoltmeter(high impedance) and
oscilloscopeon thebasisofchassis. Accordingly, theremayarise
someerrorinvoltagevalues and waveformsdepending upon the
internal impedance ofthetesterorthemeasuring unit.
-Importance safetynotice :
Components identifiedbymarkhavespecial characteristics
importantforsafety. Furthermore, special parts whichhave
purposes offire-retardant(resistors), high-qualitysound
(capacitors), low-noise (resistors), etc. areused. Whenreplacing
anyofcomponents, besuretouse onlymanufacturer'sspecified
parts shownintheparts list.
Caution !
IC, LSIand VLSIaresensitive tostaticelectricity.
Secondarytroublecanbepreventedbytaking careduring repair.
-Covertheparts boxes madeofplastics withaluminiumfoil.
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-Putaconductivemat on theworktable.
-Ground thesoldering iron.
-DonottouchthepinsofIC, LSI orVLSI withfingersdirectly.
10. Printed Circuit Board
11. Wiring Connection Diagram
12. Illustration of IC’s, Transistorsand Diodes
13. PartsLocation and Replacement PartsList
Notes:
-Importantsafetynotice:
Components identifiedbymarkhavespecial characteristics
importantforsafety.
Furthermore, special parts whichhavepurposes offire-retardent
(resistors), high-qualitysound (capacitors), low noise (resistors),
etc areused.
Whenreplacing anyofthese components, besuretouse only
manufacturer’sspecifiedparts shownintheparts list.
-TheparenthesizedindicationsintheRemarks columnsspecifythe
areas orcolour. (Refertothecoverpageforarea orcolour)
Parts withoutthese indicationscanbeusedforall areas.
-Capacitorvalues areinmicrofarads( F)unless specified
17

otherwise, P=Pico-farads(pF), F=Farads.
-Resistance values areinohms, unless specifiedotherwise, 1K=
1,000 (OHM).
-Themarking (RTL)indicates that theRetention Timeislimitedfor
thisitems. Afterthediscontinuation ofthisassemblyin
production, theitemwill continuetobeavailableforaspecific
period oftime. Theretention period ofaavailabilityisdependent
on thetypeofassembly, and inaccordance withthelaws
governing partand product retention. Aftertheend ofthisperiod,
theassemblywill no longerbeavailable.
-[M]MarkingsintheRemarks columnsindicates parts suppliedby
PAVCSG.
13.1. Cabinet
13.1.1. Cabinet Parts Location
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13.1.2. Cabinet Parts List
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Ref. No. PartNo. PartName& Description Remarks
CABINETAND CHASSIS
1RFKHBWA920PP SUBWOOFER ASS’Y [M]
1-1 RKA0147-K LEGCUSHION [M]
2RGKX0255-S STAND ORNAMENT [M]
3RYQX0136-S FRONTPANELUNIT [M]
3-1 RGLX0097-Q LIGHTINGCHIP [M]
4REM0072-3 FAN [M]
5RGRX0038A-A REAR PANEL [M]
6RHD30092 SCREW [M]
7RMC0158-S TR-FIXTURE [M]
8RMGX0039-KJ TRANSRUBBER [M]
9RMN0203 PCBHOLDER [M]
10 RMNX0135 SPACER [M]
11 RMQX0091 EVAPACKING(WOOFER) [M]
12 RMRX0047-J LED HOLDER [M]
13 SHE187-6J PCBSUPPORT [M]
14 XTB3+12JFZ SCREW [M]
15 XTB3+16AFZ SCREW [M]
16 XTB3+20JFZ SCREW [M]
17 XTB4+12AFZ SCREW [M]
18 XTBS3+8JFZ1 SCREW [M]
19 XTS4+20JFZ SCREW [M]
20 XTW3+15T SCREW [M]
21 XYC26+CJ6FZ SCREW [M]
22 XTB4+16AFZ SCREW [M]
13.2. Electrical Parts List
Ref. No. PartNo. PartName& Description Remarks
PRINTED CIRCUITBOARD
REPX0436A POWER P.C.B./ AC INLETP.C.B./ TRANSFORMER P.C.B./ LED P.C.B. [M](RTL)
REPX0435A AMPLIFIER P.C.B./ SPEAKER INTERFACEP.C.B. [M](RTL)
INTEGRATED CIRCUITS
IC501 RSN311W64B-P IC HIC [M]
IC502 C0AABB000055 IC AMP [M]
IC601 RSN312H24-P IC POWER [M]
TRANSISTORS
Q501 KTC3199GRTA TRANSISTOR [M]
Q502 KTC3199GRTA TRANSISTOR [M]
Q503 KTC3199GRTA TRANSISTOR [M]
Q505 KTC3199GRTA TRANSISTOR [M]
Q506 B1GCCFJJ0015 TRANSISTOR [M]
Q511 B1BACG000009 TRANSISTOR [M]
Q512 B1BCCG000021 TRANSISTOR [M]
Q513 KTC3199GRTA TRANSISTOR [M]
Q514 KTC3199GRTA TRANSISTOR [M]
Q515 KTC3199GRTA TRANSISTOR [M]
20