Panasonic SB-WA933 Manuale utente

ORDERNO. MD0508312C1

Active Subwoofer System

SB-WA933P

Colour

(S)...Silver Type

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SPECIFICATIONS

Specification

Activesubwoofer

Type 1way, 2speaker system (Bass

reflex)

Speaker unit(s) Impedance 4

1. Woofer 15 cm (5-7/8”) Conetype

2. Woofer 15 cm (5-7/8”) Conetype

Output sound pressure 84 dB/W(1.0m)

Frequencyrange 34 Hz-220 Hz (-16 dB)

38 Hz-190 Hz (-10 dB)

Dimensions(WxH xD) 285 mm x402 mm x520 mm

(11-7/32” x15-13/16” x20-15/32”)

Mass 15 kg(33.1lbs)

General

Power supply AC 120V, 60Hz

Power consumption 390 W

System: SC-HT933(P) MusicCenter: SA-HT933(P)

SatelliteSpeakers: SB-HT920(P)

ActiveSubwoofer: SB-WA933(P)

Note:

Specificationsare subject tochangewithout notice.

Mass and dimensionsare approximate.

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Unauthorized copying and distribution isaviolation of law.

1. Safety Precautions

1.1. GENERALGUIDELINES

1. When servicing, observe the original lead dress. Ifashort circuit

isfound, replace all parts which have been overheated or

damaged bythe short circuit.

2. After servicing, ensure that all the protective devices such as

insulation barriers, insulation papers shields are properly

installed.

3. After servicing, check for leakage current to prevent from being

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exposed to shock hazards.

(This “SafetyPrecaution” is appliedonlyinU.S.A.)

1. Before servicing, unplug the power cord to prevent an electric

shock.

2. When replacing parts, use onlymanufacturer’srecommended

components for safety.

3. Check the condition of the power cord. Replace ifwear or damage

isevident.

4. After servicing, be sure to restore the lead dress, insulation

barriers, insulation papers, shields, etc.

5. Before returning the serviced equipment to the customer, be sure

to make the following insulation resistance test to prevent the

customer from being exposed to ashock hazard.

1.1.1. LEAKAGE CURRENTCOLD CHECK

1. Unplug the AC cord and connect ajumper between the two

prongs on the plug.

2. Using an ohmmeter measure the resistance value, between the

jumpered AC plug and each exposed metalliccabinet part on the

equipment such as screwheads, connectors, control shafts, etc.

When the exposed metallicpart has areturn path to the chassis,

the reading shouldbe between 1M and 5.2 . / When the

exposed metal does not have areturn path to the chassis, the

reading must be . Fig. 1

1.1.2. LEAKAGE CURRENTHOTCHECK (See Figure1.)

1. Plug the AC cord directlyinto the AC outlet. Donot use an

isolation transformer for thischeck.

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2. Connect a1.5k , 10 watts resistor, inparallel with a0.15 F

capacitors, between each exposed metallicpart on the set and a

good earth ground such as awater pipe, as showninFigure 1.

3. Use an AC voltmeter, with 1000 ohms/voltor more sensitivity, to

measure the potential across the resistor.

4. Check each exposed metallicpart, and measure the voltage at

each point.

5. Reverse the AC plug inthe AC outlet and repeat each of the above

measurements.

6. The potential at anypoint shouldnot exceed 0.75 volts RMS. A

leakage current tester (Simpson Model 229 or equivalent) maybe

used to make the hot checks, leakage current must not exceed 1/2

milliamp. Shouldthe measurement isoutside of the limits

specified, there isapossibilityof ashock hazard, and the

equipment shouldbe examine and rechecked before itisreturned

to the customer.

1.1.3. Caution forfuse replacement

2. Handling the Lead-free Solder

2.1. About lead free solder (PbF)

Distinction of PbF P.C.B. :

P.C.B.s (manufactured) using leadfree solderwill have a PbF stampon the P.C.B.

Caution:

-Pb free solder has ahigher melting point than standard solder:

Typicallythe melting point is50 -70°F (30 -40°C)higher. / Please

use ahigh temperature soldering iron. Incase of the soldering

iron with temperature control, please set itto 700 ± 20°F (370 ±

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10°C).

-Pb free solder will tend to splash when heated too high (about

1100°F/600°C).

-When soldering or unsoldering, please completelyremove all of

the solder on the pins or solder area, and be sure to heat the

soldering points with the Pb free solder until itmelts enough.

3. Before Repair and Adjustment

Disconnect AC power, discharge PowerSupplyCapacitors C601 ~ C604 through a 10 , 1 W

resistortoground.

DO NOTSHORT-CIRCUITDIRECTLY (witha screwdriverblade, forinstance), as this may

destroysolidstate devices.

Afterrepairs are completed, restore powergraduallyusing a variac, toavoidovercurrent.

Current consumption at AC 120V, 60Hz inNO SIGNALmode (volume at min) shouldbe ~1000

mA .

4. Protection Circuitry

The protection circuitrymayhave operatedif eitherof the following conditions are noticed:

-Nosound isheard when the power isturned on.

-Sound stops during aperformance.

The function of this circuitryis toprevent circuitrydamage if, forexample, the positive and

negative speakerconnection wires are

“shorted”, orif speakersystems withanimpedance less thanthe indicatedratedimpedance of

the amplifierare used.

If this occurs, followthe procedure outlines below:

1. Turn off the power.

2. Determine the cause of the problem and correct it.

3. Turn on the power once againafter one minute.

Note :

Whenthe protection circuitryfunctions, the unit will not operate unless the poweris first turned

off and thenon again.

5. Connection of the Speaker Cables

-Besure to connect speaker cables before connecting the AC

power supplycord.

-The load impedance of anyspeaker used with thisunitmust be 4 .

-Besure to connect the cablefrom the right speaker to the right

terminal and the cablefrom the left speaker to the left terminal.

1. Stripoff the outer covering, and twist the center conductor. Make

sure the bare ends of the wires are not unravelled. (Iftheyare,

twist them tight again.)

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2. Insert the wire to the rear panel of the unitand close the lever.

6. Disassembly Procedure

“ATTENTION SERVICER”

Some chassis components mayhave sharpedges.

Be careful whendisassembling and servicing.

1. Thissection describes procedures for checking the operation of

the major printed circuitboards and replacing the main

components.

2. For reassemblyafter operation checks or replacement, reverse

the respective procedures.

Special reassemblyprocedures are described onlywhen required.

3. Select items from the following index when checks or

replacement are required.

6.1. Disassemblyflow chart

The following chart is the procedure fordisassembling the casing and inside parts forinternal

inspection whencarrying out the servicing.

To assemble the unit, reverse the steps showninthe chart below.

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6.1.1. Disassemblyof the WooferSpeakers

6.1.2. Disassemblyof the PowerAmpUnit

6.2. Disassemblyof the Speaker Unitand Checking of the P.C.B.

6.2.1. Disassemblyof the Front Panel Unit

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Step1: Slot ina steel rulerintothe holes togive a gapbetweenthe Front Panel unit and the

speakercabinet assemblyunit as arrowshown.

Steps 2: Slot a piece of wood chipinbetweenthe Front Panel unit and the steel ruleras arrow

shown.

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Step3: Use the screwdriverslightlylift up the Front Panel unit as arrowshown.

Note:

Be careful withthe bosses whichare gluedtothe unit.

Step4: Remove the Front Panel unit fromthe speakercabinet assemblyunit as arrowshown.

-Assemblyof the Front Panel unit.

Step 1: Clean up the remaining glue at the 8boss points and

replace with the normal glue.

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