5
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 1M
Ω
and 5.2M
Ω
.
When the exposed metal does not have a return path to
the chassis, the reading must be
.
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 1.5k
Ω
, 10 watts resistor, in parallel with a
0.15
μ
F 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 milliampere. 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.
Figure 1
Содержание DMR-BWT720EB
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Страница 7: ...7 2 2 Precaution of Laser Diode ...
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Страница 72: ...72 9 2 7 How to Clean the Lens of Optical Pick UP Follow the 9 2 1 Upper Base Ass y ...
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Страница 95: ...Model No DMR BWT720EB Front R FL Front R FL P C B ...
Страница 96: ...Model No DMR BWT720EB Rear USB Rear USB P C B ...
Страница 97: ...Model No DMR BWT720EB T2 Tuner T2 Tuner P C B ...
Страница 98: ...Model No DMR BWT720EB Digital Net DN Digital P C B ...
Страница 99: ...Model No DMR BWT720EB Digital Power DP Digital P C B ...
Страница 100: ...Model No DMR BWT720EB Peaks Pro 3 PK Digital P C B ...
Страница 101: ...Model No DMR BWT720EB Pro3 Exbus EX Digital P C B ...
Страница 102: ...Model No DMR BWT720EB Pro3 Peri RE Digital P C B ...
Страница 103: ...Model No DMR BWT720EB DDR3 CH0 16 D0 Digital P C B ...
Страница 104: ...Model No DMR BWT720EB DDR3 CH1 16 D1 Digital P C B ...
Страница 105: ...Model No DMR BWT720EB HDMI 1 H1 Digital P C B ...
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Страница 107: ...Model No DMR BWT720EB Ether USB EU Digital P C B ...
Страница 108: ...Model No DMR BWT720EB Video IO VI Digital P C B ...
Страница 109: ...Model No DMR BWT720EB DV1394 DV Digital P C B ...
Страница 110: ...Model No DMR BWT720EB Audio IO AU Digital P C B ...
Страница 111: ...Model No DMR BWT720EB Timer TM Digital P C B ...
Страница 112: ...Model No DMR BWT720EB Main P C B Component Side ...
Страница 113: ...Model No DMR BWT720EB Main P C B Foil Side ...
Страница 114: ...Model No DMR BWT720EB AV IO P C B Component Side ...
Страница 115: ...Model No DMR BWT720EB AV IO P C B Foil Side ...
Страница 116: ...Model No DMR BWT720EB Front L P C B Component Side ...
Страница 117: ...Model No DMR BWT720EB Front L P C B Foil Side ...
Страница 118: ...Model No DMR BWT720EB Front R FL P C B Component Side ...
Страница 119: ...Model No DMR BWT720EB Front R FL P C B Foil Side ...
Страница 120: ...Model No DMR BWT720EB Rear USB P C B Component Side ...
Страница 121: ...Model No DMR BWT720EB Rear USB P C B Foil Side ...
Страница 122: ...Model No DMR BWT720EB T2 Tuner P C B Component Side ...
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Страница 124: ...Model No DMR BWT720EB Digital P C B Component Side ...
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