Page 1
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 AboutLead-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 ofWoofer (1)
12
6.5. Disassembly of Rear net frame unit
13
6.6. Disassembly ofWoofer (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
2
SB-WA1000E
Page 2
1 Safety Precautions
1.1. General Guidelines
1. Whenservicing, 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 installe d.
3. After servicing, check for leakage current checks to prevent from beingexpose d 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 anohmmeter measure the resistance value, between the jumpered AC plug and each exposed metalliccabine t part on
the equipment such as screwheads, connectors, control shafts, etc.When the exposedmetallic part has a return path to the
chassis, the reading should be between 1M-„¦and 5.2-„¦.
When theexpose d 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 isolatio n transformer for this check.
2. Conne ct a 1.5k-„¦, 10 watts resistor, in parallel with a 0.15µF capacitors, between each expose d 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 expose d 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.
3
SB-WA1000E