SB-WA535EE (sm).pdf

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ORDER NO. MD0507276C3
Active Subwoofer System
SB-WA535EE
Colour
(S)... Silver Type
Specification
n Active subwoofer
Type
1 way, 2 speaker system (Bass
reflex)
n System : SC-HT535 (EE)
Music Center: SA-HT535 (EE)
Satellite Speakers: SB-HT535 (EG)
Active Subwoofer: SB-WA535 (EE)
Speaker unit(s)
1. Woofer
13 cm Cone type
2. Woofer
13 cm Cone type
Note :
Specifications are subject to change without notice.
Mass and dimensions are approximate.
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)
201.5 x 368.2 x 491.5 mm
Mass
11.3 kg
n General
Power consumption
250 W
Power supply
AC 230V, 50Hz
CONTENTS
Page
Page
1 Safety Precautions
3
4 Protection Circuitry
4
1.1.GENERAL GUIDELINES
3
5 Connection of the Speaker Cables
5
2 Handling the Lead-free Solder
4
6 Disassembly Procedure
6
2.1.About lead free solder (PbF)
4
6.1.Disassembly flow chart
6
3 Before Repair and Adjustment
4
© 2005 Matsushita Electric Industrial Co. Ltd.. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
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SB-WA535EE
6.2.Disassembly of the Speaker Unit and Checking of the
P.C.B.
11 Printed Circuit Board
21
8
11.1. Power P.C.B.
21
7 Voltage Measurement and Waveform Chart
14
11.2. AC Inlet P.C.B. and Transformer P.C.B.
23
7.1.Voltage Measurement
14
12 Wiring Connection Diagram
24
7.2.Waveform Chart
15
13 Illustration of ICs, Transistors and Diodes
25
8 Block Diagram
16
14 Parts Location and Replacement Parts List
26
9 Notes of Schematic Diagram
17
14.1. Cabinet
27
10 Schematic Diagram
18
14.2. Electrical Parts List
30
10.1. Power Circuit
18
14.3. Packing Materials & Accessories Parts List
32
10.2. Transformer Circuit and AC Inlet Circuit
20
14.4. Packaging
32
2
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SB-WA535EE
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 1M
Ω
and 5.2
Ω
.
Fig. 1
1.1.2. LEAKAGE CURRENT HOT CHECK (See Figure 1.)
, 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 repaired and rechecked before it is returned to
the customer.
3
.
When the exposed metal does not have a return path to the chassis, the reading must be
1.Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2.Connect a 1.5k
Ω
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SB-WA535EE
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 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.
, 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 ~410 mA.
Ω
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.
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.
4
3 Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C546~C549 through a 10
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SB-WA535EE
5 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 4
Ω
.
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.
·
5
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