2.1.1. 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
2.1.2. 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
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.
2 Safety precautions
2.1. 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.
2.2. Caution for fuse replacement
5
DMR-EH60PC / DMR-EH60PL / DMR-EH60GT
Summary of Contents for DMR-EH60PC
Page 2: ...2 DMR EH60PC DMR EH60PL DMR EH60GT ...
Page 4: ...1 Specifications 4 DMR EH60PC DMR EH60PL DMR EH60GT ...
Page 7: ...4 Precaution of Laser Diode 7 DMR EH60PC DMR EH60PL DMR EH60GT ...
Page 9: ...7 Each Button 9 DMR EH60PC DMR EH60PL DMR EH60GT ...
Page 10: ...10 DMR EH60PC DMR EH60PL DMR EH60GT ...
Page 15: ...Error Occurring Disc State 15 DMR EH60PC DMR EH60PL DMR EH60GT ...
Page 30: ...14 2 Checking and Repairing of Digital P C B 30 DMR EH60PC DMR EH60PL DMR EH60GT ...
Page 31: ...14 3 Checking and Repairing of Main P C B 31 DMR EH60PC DMR EH60PL DMR EH60GT ...
Page 33: ...14 4 Checking and Repairing of DVD RAM Drive 33 DMR EH60PC DMR EH60PL DMR EH60GT ...
Page 34: ...14 5 Checking and Repairing of HDD 34 DMR EH60PC DMR EH60PL DMR EH60GT ...
Page 48: ...DMR EH60PC DMR EH60PL DMR EH60GT 48 ...
Page 72: ...DMR EH60PC DMR EH60PL DMR EH60GT 72 ...
Page 73: ...22 Exploded Views 22 1 Casing Parts Mechanism Section 73 DMR EH60PC DMR EH60PL DMR EH60GT ...
Page 74: ...22 2 Packing Accessories Section 74 DMR EH60PC DMR EH60PL DMR EH60GT ...
