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 milliamp. 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 re-checked before it is
returned to the customer.
Fig. 1
Summary of Contents for DMR-BWT955GL
Page 2: ...2 ...
Page 3: ...3 ...
Page 36: ...36 5 Location of Controls and Components ...
Page 37: ...37 ...
Page 52: ...52 Item FL Display Key Operation Mode Name Description Remote controller key ...
Page 70: ...70 9 12 6 Grease ...
Page 74: ...74 10 1 2 Checking and Repairing of BD Drive ...
Page 75: ...75 10 1 3 Checking and Repairing of Main P C B ...
Page 76: ...76 10 1 4 Checking and Repairing of Digital P C B ...
Page 77: ...77 ...
Page 87: ...Model No DMR BWT955GL SCHEMATIC DIAGRAM NOTICE ...
Page 88: ...Model No DMR BWT955GL PART LIST NOTICE ...
Page 89: ...Model No DMR BWT955GL ABBREVIATION ...
Page 90: ...Model No DMR BWT955GL POWER SECTION MAIN P C B ...
Page 91: ...Model No DMR BWT955GL MAIN NET SECTION MAIN P C B ...
Page 92: ...Model No DMR BWT955GL FRONT SECTION MAIN P C B ...
Page 93: ...Model No DMR BWT955GL HDD BRIDGE SECTION HDD BRIDGE P C B ...
Page 94: ...Model No DMR BWT955GL AUDIO IO SECTION DIGITAL P C B ...
Page 95: ...Model No DMR BWT955GL DDR3 CH 0 SECTION DIGITAL P C B ...
Page 96: ...Model No DMR BWT955GL DDR3 CH 1 SECTION DIGITAL P C B ...
Page 97: ...Model No DMR BWT955GL DIGI NET SECTION DIGITAL P C B ...
Page 98: ...Model No DMR BWT955GL DIGITAL POWER SECTION DIGITAL P C B ...
Page 99: ...Model No DMR BWT955GL ETHER SECTION DIGITAL P C B ...
Page 100: ...Model No DMR BWT955GL EXBUS PERI SECTION DIGITAL P C B ...
Page 101: ...Model No DMR BWT955GL PEAKS PRO4 SECTION DIGITAL P C B ...
Page 102: ...Model No DMR BWT955GL PRO4 POWER SECTION DIGITAL P C B ...
Page 103: ...Model No DMR BWT955GL SATA SD USB SECTION DIGITAL P C B ...
Page 104: ...Model No DMR BWT955GL TIMER SECTION DIGITAL P C B ...
Page 105: ...Model No DMR BWT955GL VIDEO HDMI SECTION DIGITAL P C B ...
Page 106: ...Model No DMR BWT955GL DIGITAL AUDIO SECTION DIGITAL P C B ...
Page 107: ...Model No DMR BWT955GL DIGITAL TUNER SECTION DIGITAL P C B ...
Page 108: ...Model No DMR BWT955GL MAIN P C B COMPONENT SIDE ...
Page 109: ...Model No DMR BWT955GL MAIN P C B FOIL SIDE ...
Page 110: ...Model No DMR BWT955GL D AUDIO P C B COMPONENT SIDE ...
Page 111: ...Model No DMR BWT955GL D AUDIO P C B FOIL SIDE ...
Page 112: ...Model No DMR BWT955GL FRONT P C B COMPONENT SIDE ...
Page 113: ...Model No DMR BWT955GL FRONT P C B FOIL SIDE ...
Page 114: ...Model No DMR BWT955GL DIGITAL P C B COMPONENT SIDE ...
Page 115: ...Model No DMR BWT955GL DIGITAL P C B FOIL SIDE ...
Page 116: ...Model No DMR BWT955GL HDD BRIDGE P C B COMPONENT SIDE ...
Page 117: ...Model No DMR BWT955GL HDD BRIDGE P C B FOIL SIDE ...
Page 132: ...Model No DMR BWT955GL Exploded View ...
Page 133: ...Model No DMR BWT955GL Mechanism View ...
