4 Safety Precautions
4.1. 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.
4.1.1. 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 1M
Ω
and 5.2M
Ω
.
When the exposed metal does not have a return path to the chassis, the reading must be
.
Figure 1
4.1.2. 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 1.5k
Ω
, 10 watts resistor, in parallel with a 0.15µF capacitor, 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 out 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.
4
Summary of Contents for SC-TM900DVD
Page 9: ...10 Operation Procedures 9 ...
Page 10: ...10 ...
Page 11: ...11 Disc information 11 ...
Page 12: ...12 ...
Page 15: ...15 ...
Page 35: ...Step 2 Remove DVD traverse deck by rotating to the arrow direction 35 ...
Page 39: ...39 ...
Page 40: ...16 17 3 Replacement for the traverse deck Follow the Step 1 Step 10 of item 16 17 2 40 ...
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Page 65: ...18 3 1 Cassette Deck Section 18 3 2 Adjustment Point 18 3 Alignment Points 65 ...
Page 77: ...20 Voltage Measurement This section is not available at time of issue 77 ...
Page 107: ...35 6 6 7 7 7 7 7 7 6 U 2 2 2 0 2 1 2 2 1 2 2 1 2 1 2 2 2 4 6 35 ...
Page 109: ...0 7 7 7 2 2 2 3 4 6 EW ODEL GT IC OTE ATERIAL 3IZE MODIFIED 0 4 25 ...
Page 110: ...2 0 7 2 0 5NIT MM 0ARTS NO AME PPROVED HECKED 3 ...
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Page 139: ...26 1 Deck Mechanism RAA3413 S 26 1 1 Deck Mechanism Parts Location 139 ...
Page 140: ...140 ...
Page 142: ...26 2 DVD Loading Mechanism 26 2 1 DVD Loading Mechanism Parts Location 142 ...
Page 143: ...143 ...
Page 145: ...26 3 Cabinet 26 3 1 Cabinet Parts Location 145 ...
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Page 188: ...3 Connection of the Wiring Diagram 4 Cabinet Parts Location 5 service m speaker 11 ...
Page 192: ...3 Connection of the Wiring Diagram 9 service m speaker ...
Page 193: ...4 Cabinet Parts Location 3 10 service m speaker ...
Page 198: ...3 Connection of the Wiring Diagram 4 Cabinet Parts Location 15 service m speaker ...
Page 203: ...3 Connection of the Wiring Diagram 4 Cabinet Parts Location 20 service m speaker ...
