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-PWT550GL
Page 2: ...2 ...
Page 3: ...3 ...
Page 26: ...26 3 10 1 2 Description of the diagnosis code screen Each of the diagnosis code details ...
Page 33: ...33 5 Location of Controls and Components ...
Page 34: ...34 ...
Page 35: ...35 ...
Page 50: ...50 Item FL Display Key Operation Mode Name Description Remote controller key ...
Page 67: ...67 9 11 6 Grease ...
Page 71: ...71 10 1 2 Checking and Repairing of BD Drive ...
Page 72: ...72 10 1 3 Checking and Repairing of Main P C B ...
Page 73: ...73 10 1 4 Checking and Repairing of Digital P C B ...
Page 74: ...74 ...
Page 83: ...Model No DMR PWT550GL GZ SCHEMATIC DIAGRAM NOTICE ...
Page 84: ...Model No DMR PWT550GL GZ PART LIST NOTICE ...
Page 85: ...Model No DMR PWT550GL GZ ABBREVIATION ...
Page 86: ...Model No DMR PWT550GL GZ POWER SECTION POWER P C B ...
Page 87: ...Model No DMR PWT550GL GZ MAIN NET SECTION MAIN P C B ...
Page 88: ...Model No DMR PWT550GL GZ FRONT SW SECTION MAIN P C B ...
Page 89: ...Model No DMR PWT550GL GZ SATA DIGITAL P C B ...
Page 90: ...Model No DMR PWT550GL GZ AUDIO IO SECTION DIGITAL P C B ...
Page 91: ...Model No DMR PWT550GL GZ DDR3 CH 0 SECTION DIGITAL P C B ...
Page 92: ...Model No DMR PWT550GL GZ DDR3 CH 1 SECTION DIGITAL P C B ...
Page 93: ...Model No DMR PWT550GL GZ DEMOD SECTION DEMOD P C B ...
Page 94: ...Model No DMR PWT550GL GZ DIGI NET SECTION DIGITAL P C B ...
Page 95: ...Model No DMR PWT550GL GZ DIGITAL POWER SECTION DIGITAL P C B ...
Page 96: ...Model No DMR PWT550GL GZ ETHER SECTION DIGITAL P C B ...
Page 97: ...Model No DMR PWT550GL GZ EXBUS PERI SECTION DIGITAL P C B ...
Page 98: ...Model No DMR PWT550GL GZ PEAKS PRO4 SECTION DIGITAL P C B ...
Page 99: ...Model No DMR PWT550GL GZ PRO4 POWER SECTION DIGITAL P C B ...
Page 100: ...Model No DMR PWT550GL GZ SATA SD USB SECTION DIGITAL P C B ...
Page 101: ...Model No DMR PWT550GL GZ TIMER SECTION DIGITAL P C B ...
Page 102: ...Model No DMR PWT550GL GZ VIDEO HDMI SECTION DIGITAL P C B ...
Page 103: ...Model No DMR PWT550GL GZ MAIN P C B COMPONENT SIDE ...
Page 104: ...Model No DMR PWT550GL GZ MAIN P C B FOIL SIDE ...
Page 105: ...Model No DMR PWT550GL GZ DIGITAL P C B COMPONENT SIDE ...
Page 106: ...Model No DMR PWT550GL GZ DIGITAL P C B FOIL SIDE ...
Page 107: ...Model No DMR PWT550GL GZ FRONT SW P C B COMPONENT SIDE ...
Page 108: ...Model No DMR PWT550GL GZ FRONT SW P C B FOIL SIDE ...
Page 109: ...Model No DMR PWT550GL GZ SATA P C B COMPONENT SIDE ...
Page 110: ...Model No DMR PWT550GL GZ SATA P C B FOIL SIDE ...
Page 122: ...Model No DMR PWT550GL GZ Exploded View ...
Page 123: ...Model No DMR PWT550GL GZ Mechanism View ...
