Panasonic SB-WA870EB Bedienungsanleitung

nActive subwoofer

Type 1 way, 1 speaker system (Bass

reflex)

Speaker unit Impedance 4 Ω

Woofer 20 cm Cone type

Output sound pressure 84 dB/W (1.0 m)

Frequency range 34 Hz-220 Hz (-16 dB)

38 Hz-190 Hz (-10 dB)

Dimensions (W x H x D) 248 x 417 x 476.6 mm

Mass 16.4 kg

nGeneral

Power consumption 390V

Power supply

Continental Europe and Russia AC 230V, 50Hz

The United Kingdom, Australia and

N.Z. AC 230V-240V, 50Hz

Power consumption in standby

mode 0.7 W

1 Safety Precautions 3

1.1. GENERAL GUIDELINES 3

distribution is a violation of law.

SB-WA870EB

SB-WA870EG

Colour

(S)...Silver Type

Notes :

1. Specifications are subject to change without notice.

2. Mass and dimensions are approximate.

SB-HT870P-S consists of :

SB-PF921P-S x 2, SB-PS921P-S x 2 and SB-PC920P-S x 1

nSystem : SC-HT870 (E) Music Center: SA-HT870 (E)

Satellite Speakers: SB-HT870 (P)

Active Subwoofer: SB-WA870 (EG)

nSystem : SC-HT870 (EB) Music Center: SA-HT870 (EB)

Satellite Speakers: SB-HT870 (P)

Active Subwoofer: SB-WA870 (EB)

nSystem : SC-HT870 (EG) Music Center: SA-HT870 (EG)

Satellite Speakers: SB-HT870 (P)

Active Subwoofer: SB-WA870 (EG)

2 Handling the Lead-free Solder 4

2.1. About lead free solder (PbF) 4

Active Subwoofer System

Specification

CONTENTS

Page Page

ORDER NO. MD0403127C2

http://www.Datasheet4U.com

3 Before Repair and Adjustment 4

4 Protection Circuitry 4

5 Connection of the Speaker Cables 5

6 Disassembly Procedure 6

6.1. Disassembly flow chart 6

6.2. Disassembly of the Speaker Unit and Checking of the

P.C.B. 7

6.3. Main Component Replacement Procedures 12

7 Connection of the Speaker Wiring 14

8 Block Diagram 15

9 Schematic Diagram 16

10 Printed Circuit Board 21

11 Wiring Connection Diagram 26

12 Illustration of IC 痴, Transistors and Diodes 27

13 Parts Location and Replacement Parts List 28

13.1. Cabinet 29

13.2. Electrical Parts List 31

13.3. Packing Materials & Accessories Parts List 34

13.4. Packaging 34

SB-WA870EB / SB-WA870EG

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, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly

installed.

3. After servicing, make the following leakage current checks to prevent the customer 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. Measure the resistance value, with an ohmmeter, 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. In case a measurement is outside of the limits

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

the customer.

SB-WA870EB / SB-WA870EG

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 lead free solder will have a PbF stamp on the P.C.B.

Caution:

Pb free solder has a higher melting point that 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.

3 Before Repair and Adjustment

Disconnect AC power, discharge Power Supply Capacitors C601, C602, C603, C604 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 230V, 50Hz in NO SIGNAL mode should be ~1000 mA (EG ONLY).

Current consumption at AC 240V, 50Hz in NO SIGNAL mode should be ~1000 mA (EB ONLY).

4 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-WA870EB / SB-WA870EG

5 Connectio n 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.

Notes :

To prevent damage to circuitry, never short-circuit positive (+) and negative (-) speaker wires.

Be sure to connect only positive (Copper) wires to positive (+) terminals and negative (Silver) wires to negative (-) terminals.

SB-WA870EB / SB-WA870EG

Some chassis components may have sharp edges.

Be careful when disassembling and servicing.

6 Disassem bly 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.

Contents

Disassembly of the Speaker Unit

Main Component Replacement Procedures

6.1. 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.

SB-WA870EB / SB-WA870EG

Step 1: Remove all the screws.

Step 2: Remove the stand base.

Steps 3 & 4: Remove all the screws from the bottom of the

speaker unit.

Step 5: Use the Steel Ruler to slot into the hole of the bottom

cabinet of speaker.

Step 6: Use the Wood Chip to slot between the Net Frame and

the Steel Ruler as arrow shown.

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

SB-WA870EB / SB-WA870EG

Step 7: Use the Screwdriver slightly lift up the Net Frame as

arrow shown.

Step 8: Take note of the bosses which glued to the unit .

Assembly of Net Frame.

Clean up all the glue at the 6 Boss points and

replace with the normal glue.

Replace the Net Frame firmly back into the cabinet.

Step 9: Remove the Net Frame from the cabinet of speaker.

Step 10: Remove all the screws from the subwoofer.

SB-WA870EB / SB-WA870EG

Step 11: Remove the subwoofer by detact the 2 wires.

Step 12: Remove the screws.

Step 13: Pull out the Power Amp unit slightly as shown.

Note: Be careful of attach wire at CN606.

Step 14: Release the connector CN606 then pull out the entire

Power Amp unit.

Step 15: Remove all the screws.

Step 16: Release the connector CN507 to remove the rear

panel.

Step 17: Remove all the screws.

SB-WA870EB / SB-WA870EG

Step 18: Remove all the screws.

Step 19: Remove all the screws.

Step 20: Detach the connector CN503 and remove the

transformer.

Checking for the Transformer, Amplifier and AC Inlet P.C.B.

Step 21: Place the Transformer P.C.B., Amplifier

P.C.B. and the AC Inlet P.C.B. as shown for

checking.

Steps 22: Release the AC Inlet P.C.B. as arrow

shown.

Checking for the Power and Speaker Interface P.C.B.

SB-WA870EB / SB-WA870EG

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