Panasonic SB-WA1000E User manual

nSPEAKER SECTION
Type 1 way 2 speaker system
Bass-reflex type
Speaker
Woofer (1 & 2) 17 cm cone type x 2
Sound pressure level 83 dB/W (1.0 m)
Frequency range (with amp) 28 Hz - 300 Hz (at -16 dB)
32 Hz - 240 Hz (at -10 dB)
nAMPLIFIER SECTION
Output power 100 W (6 Ω)x2(THD0.9%)
Input sensitivity / Input Impedance 300 mV/33 kΩ(RCA jack)
Phase switching NORMAL/REVERSE
Low pass filter 50 Hz - 200 Hz Variable
nGENERAL
Power supply AC 230 V, 50Hz
Power consumption 150 W
Dimensions (W x H x D) 254 mm x 496 mm x 500 mm
Mass Approx. 22 kg
Power consumption in input
standby condition:
1.5 W
1 Safety Precautions 3
©2006 Matsushita Electric Industrial Co. Ltd.. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
SB-WA1000E
Colour
(S)... Silver Type
Note :
Specifications are subject to change without notice.
nSystem : SB-TP1000E-S Speaker System : SB-FS1000E-S
Active subwoofer : SB-WA1000E-
S
Active subwoofer : SB-
WA1000GN-S
SB-TP1000E-S consists of SB-FS1000E-S (x 1) & SB-WA1000E-S (x
1)
SB-FS1000E-S consists of SB-FC1000LE-S (x 1), SB-FC1000RE-S
(x 1) & SB-HS1000E-S (x 2)
Active Subwoofer System
Specification
CONTENTS
Page Page
ORDER NO. MD0607260CE

1.1. General Guidelines 3
1.2. Before Repair and Adjustment 4
1.3. Protection Circuitry 4
2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices 5
3 About Lead-Free Solder (PbF) 6
3.1. Service caution based on legal restrictions 6
4 Accessory 7
5 Operating Instructions Procedures 8
5.1. Subwoofer operation 8
6 Assembling and Disassembling 11
6.1. Caution 11
6.2. Disassembly flow chart 11
6.3. Disassembly of Front net frame unit 12
6.4. Disassembly of Woofer (1) 12
6.5. Disassembly of Rear net frame unit 13
6.6. Disassembly of Woofer (2) 13
6.7. Disassembly and checking of Level control P.C.B and LED
P.C.B 14
6.8. Disassembly of the Stand base 16
6.9. Disassembly of Amp unit 16
6.10. Disassembly of Rear panel assembly 18
6.11. Disassembly of Fan unit 18
6.12. Disassembly and checking of AC inlet P.C.B, Power P.C.B
and Transformer P.C.B 19
6.13. Replacement of the Power IC 20
7 Voltage Measurement and Waveform Chart 21
7.1. Voltage Measurement 21
7.2. Waveform Chart 22
8 Connection of the Speaker wiring 23
9 Wiring Connection Diagram 24
10 Block Diagram 25
11 Notes Of Schematic Diagram 27
12 Schematic Diagram 29
12.1. Power Circuit 29
12.2. Level Control Circuit, Transformer Circuit and LED Circuit
30
12.3. AC Inlet Circuit 31
13 Printed Circuit Board 33
13.1. Power P.C.B 33
13.2. Level Control P.C.B, LED P.C.B, Transformer P.C.B and
AC Inlet P.C.B 34
14 Illustration of IC's, Transistors and Diodes 35
15 Exploded view 36
15.1. Cabinet Parts Location 36
15.2. Packaging 38
16 Replacement Parts List 39
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SB-WA1000E

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 checks 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 .
Figure 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 repaired and re-checked before it is returned
to the customer.
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SB-WA1000E

1.2. Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C508 & C703 through a 10Ω, 1W 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 V, 50 Hz in NO SIGNAL mode should be 200~700 mA.
1.3. 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.
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SB-WA1000E

2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and
semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage
caused by electro static discharge (ESD).
1. Immediately before handling any semiconductor component or semiconductor-equiped assembly, drain off any ESD on your
body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap,
which should be removed for potential shock reasons prior to applying power to the unit under test.
2. After removing an electrical assembly equiped with ES devices, place the assembly on a conductive surface such as aluminium
foil, to prevent electrostatic charge build up or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static solder remover device. Some solder removal devices not classified as “anti-static (ESD protected)” can
generate electrical charge to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most
replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminium foil or
comparable conductive material).
7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be installed.
Caution
Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8. Minimize body motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing
together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) sufficient to
damage an ES device).
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SB-WA1000E