Panasonic SB-WA15E Bedienungsanleitung

nActive subwoofer

Type 1 Way 2 Speaker, Bass-ref.

Speaker unit (Woofer) 13 cm cone type, 4 Ω

Output sound pressure level 80 dB/W (1.0 m)

Frequency range 40 Hz-220 Hz (-16 dB)

45 Hz-180 Hz (-10 dB)

Dimensions (W x H x D) 200 x 367.5 x 492 mm

Mass 11.3 kg

nGeneral

Power supply AC 230-240 V, 50 Hz (EB)

AC 230 V, 50 Hz (E)

Power consumption 340 W

Power consumption (Standby

mode)

nSystem: SC-HT15EG-S Music Center: SA-HT15EG-S

Satellite speakers: SB-HT15P-S

Active subwoofer: SB-WA15E-S

1 Safety Precautions 3

rights reserved. Unauthorized copying and

distribution is a violation of law.

SB-WA15E

SB-WA15EB

Colour

(S)...Silver Type

nSystem: SC-HT15EP-S Music Center: SA-HT15EP-S

Satellite speakers: SB-HT15P-S

Active subwoofer: SB-WA15E-S

nSystem: SC-HT15EB-S Music Center: SA-HT15EB-S

Satellite speakers: SB-HT15P-S

Active subwoofer: SB-WA15EB-S

Note :

Specifications are subject to change without notice.

Mass and dimensions are approximate.

Active Subwoofer System

Specification

CONTENTS

Page Page

ORDER NO. MD0503091C2

1.1. GENERAL GUIDELINES 3

2 Caution for AC Mains Lead 4

3 Handling the Lead-free Solder 5

3.1. About lead free solder (PbF) 5

4 Before Repair and Adjustment 5

5 Protection Circuitry 5

6 Connection of the Speaker Cables 6

7 Disassembly Procedure 7

7.1. Disassembly flow chart 7

7.2. Disassembly of the Speaker Unit and Checking of the

P.C.B. 9

8 Voltage Measurement and Waveform Chart 14

8.1. Voltage Measurement 14

8.2. Waveform Chart 15

9 Block Diagram 16

10 Notes of Schematic Diagram 17

11 Schematic Diagram 18

11.1. Power Circuit 18

11.2. AC Inlet Circuit and Transformer Circuit 20

12 Printed Circuit Board 21

12.1. Power P.C.B. 21

12.2. AC Inlet P.C.B. and Transformer P.C.B. 23

13 Wiring Connection Diagram 24

14 Illustration of IC 痴, Transistors and Diodes 25

15 Parts Location and Replacement Parts List 26

15.1. Cabinet 27

15.2. Electrical Parts List 30

15.3. Packing Materials & Accessories Parts List 32

15.4. Packaging 32

SB-WA15E / SB-WA15EB

1 Safety Precautions

1.1. GENERAL GUIDELINES

1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or

damaged by the 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 exposed to shock hazards.

1.1.1. LEAKAGE CURRENT COLD CHECK

1. Unplug the AC cord and connect a jumper between the two prongs on the plug.

2. Using an ohmmeter measure the resistance value, between the jumpered AC plug and each exposed metallic cabinet part on

the equipment such as screwheads, connectors, control shafts, etc. When the exposed metallic part has a return path to the

chassis, the reading should be between 1MΩand 5.2Ω.

When the exposed metal does not have a return path to the chassis, the reading must be .

Fig. 1

1.1.2. LEAKAGE CURRENT HOT CHECK (See Figure 1.)

1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.

2. Connect a 1.5kΩ, 10 watts resistor, in parallel with a 0.15µF capacitors, between each exposed metallic part on the set and a

good earth ground such as a water pipe, as shown in Figure 1.

3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to measure the potential across the resistor.

4. Check each exposed metallic part, and measure the voltage at each point.

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

6. The potential at any point should not exceed 0.75 volts RMS. A leakage current tester (Simpson Model 229 or equivalent) may

be used to make the hot checks, leakage current must not exceed 1/2 milliamp. Should the measurement is outside of the limits

specified, there is a possibility of a shock hazard, and the equipment should be examine and rechecked before it is returned

to the customer.

SB-WA15E / SB-WA15EB

2 Caution for AC Mains Lead

SB-WA15E / SB-WA15EB

3 Handling the Lead-free Solder

3.1. About lead free solder (PbF)

Distinction of PbF P.C.B. :

P.C.B.s (manufactured) using lead free solder will have a PbF stamp on the P.C.B.

Caution:

Pb free solder has a higher melting point than standard solder: Typically the melting point is 50 - 70°F (30 - 40°C) higher.

Please use a high temperature soldering iron. In case of the soldering iron with temperature control, please set it to 700 ± 20°F

(370 ± 10°C).

Pb free solder will tend to splash when heated too high (about 1100°F/600°C).

When soldering or unsoldering, please completely remove all of the solder on the pins or solder area, and be sure to heat the

soldering points with the Pb free solder until it melts enough.

4 Before Repair and Adjustment

Disconnect AC power, discharge Power Supply Capacitors C546 ~ C549 through a 10 Ω, 1 W resistor to ground.

DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices.

After repairs are completed, restore power gradually using a variac, to avoid overcurrent.

Current consumption at AC 230-240V, 50Hz in NO SIGNAL mode (volume at min) should be ~620 mA (EB)

Current consumption at AC 230V, 50Hz in NO SIGNAL mode (volume at min) should be ~620 mA (E)

5 Protection Circuitry

The protection circuitry may have operated if either of the following conditions are noticed:

No sound is heard when the power is turned on.

Sound stops during a performance.

The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are

“shorted”, or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used.

If this occurs, follow the procedure outlines below:

1. Turn off the power.

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

3. Turn on the power once again after one minute.

Note :

When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.

SB-WA15E / SB-WA15EB

6 Connection of the Speaker Cables

Be sure to connect speaker cables before connecting the AC power supply cord.

The load impedance of any speaker used with this unit must be 4Ω.

Be sure to connect the cable from the right speaker to the right terminal and the cable from the left speaker to the left terminal.

1. Strip off the outer covering, and twist the center conductor. Make sure the bare ends of the wires are not unravelled. (If they are,

twist them tight again.)

2. Insert the wire to the rear panel of the unit and close the lever.

SB-WA15E / SB-WA15EB

Some chassis components may have sharp edges.

Be careful when disassembling and servicing.

7 Disassembly Procedure

“ATTENTION SERVICER”

1. This section describes procedures for checking the operation of the major printed circuit boards and replacing the

main components.

2. For reassembly after operation checks or replacement, reverse the respective procedures.

Special reassembly procedures are described only when required.

3. Select items from the following index when checks or replacement are required.

Disassembly of the Front Panel Unit

Disassembly of Woofer Speaker Unit 1

Disassembly of Woofer Speaker Unit 2

Disassembly of the Power Amp Unit

Disassembly of the Rear Panel and Fan Unit

Disassembly and checking of the AC Inlet P.C.B.

Disassembly and checking of the Power P.C.B. and Transformer P.C.B.

Replacement of Power ICs and Transistors

7.1. Disassembly flow chart

The following chart is the procedure for disassembling the casing and inside parts for internal inspection when carrying out the

servicing.

To assemble the unit, reverse the steps shown in the chart below.

7.1.1. Disassembly of the Woofer Speakers

SB-WA15E / SB-WA15EB

7.1.2. Disassembly of the Power Amp Unit

SB-WA15E / SB-WA15EB

7.2.1. Disassembly of the Front Panel

Unit

Step 1: Slot a steel ruler into the holes to give a gap between

the Front Panel unit and the speaker cabinet assembly unit.

Steps 2: Slot a piece of wood chip in between the Front Panel

unit and the steel ruler as arrow shown.

Step 3: Use the screwdriver slightly lift up the Front Panel unit

as arrow shown.

Note:

Be careful with the bosses which are glued to the unit.

Step 4: Remove the Front Panel unit from the speaker cabinet

assembly unit as arrow shown.

7.2. Disassembly of the Speaker Unit and Checking of the P.C.B.

SB-WA15E / SB-WA15EB

Assembly of the Front Panel unit.

Step 1: Clean up the remaining glue at the 6 boss points

and replace with the normal glue.

Step 2: Replace the Front Panel unit firmly back to the

speaker cabinet assembly unit.

7.2.2. Disassembly of Woofer Speaker

Unit 1

Follow Step (1) to Step (4) described in section 7.2.1.

Step 1: Remove 4 screws from the Woofer 1.

Step 2: Remove the Woofer 1 by detaching the (+) and (-)

wires.

7.2.3. Disassembly of Woofer Speaker

Unit 2

Follow Step (1) to Step (4) described in section 7.2.1.

SB-WA15E / SB-WA15EB

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