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 screw heads, 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 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 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.
6
TH-37PH9UK / TH-42PH9UK
Содержание TH-37PH9UK
Страница 5: ...1 Applicable signals 5 TH 37PH9UK TH 42PH9UK ...
Страница 30: ...8 1 2 Location of Lead wiring 2 The lead wiring is dressed as shown in figure 30 TH 37PH9UK TH 42PH9UK ...
Страница 33: ...8 2 2 Location of Lead wiring 2 The lead wiring is dressed as shown in figure 33 TH 37PH9UK TH 42PH9UK ...
Страница 37: ...9 4 Adjustment Volume Location 9 4 1 TH 37PH9UK 9 4 2 TH 42PH9UK 37 TH 37PH9UK TH 42PH9UK ...
Страница 38: ...9 5 Test Point Location 9 5 1 TH 37PH9UK 9 5 2 TH 42PH9UK 38 TH 37PH9UK TH 42PH9UK ...
Страница 42: ...10 2 IIC mode structure following items value is sample data 42 TH 37PH9UK TH 42PH9UK ...
Страница 44: ...44 TH 37PH9UK TH 42PH9UK ...
Страница 46: ...46 TH 37PH9UK TH 42PH9UK ...
Страница 49: ...3 Remarks Above Fan function is operated during the fans are installed 49 TH 37PH9UK TH 42PH9UK ...
Страница 52: ...13 Option Setting 52 TH 37PH9UK TH 42PH9UK ...
Страница 54: ...54 TH 37PH9UK TH 42PH9UK ...
Страница 87: ...15 Block and Schematic Diagram 15 1 Schematic Diagram Notes TH 37PH9UK TH 42PH9UK 87 ...
Страница 161: ...16 Parts Location 16 1 Exploded View 16 1 1 TH 37PH9UK 161 TH 37PH9UK TH 42PH9UK ...
Страница 162: ...16 1 2 TH 42PH9UK 162 TH 37PH9UK TH 42PH9UK ...
Страница 163: ...16 1 3 Escutcheon part location enlarged view for 37 42 inch 163 TH 37PH9UK TH 42PH9UK ...
Страница 164: ...16 2 Cable relation 16 2 1 TH 37PH9UK 16 2 2 TH 42PH9UK 164 TH 37PH9UK TH 42PH9UK ...
Страница 165: ...16 3 Packing summary 165 TH 37PH9UK TH 42PH9UK ...
Страница 167: ...18 Replacement Parts List 18 1 Replacement Parts List Notes 167 TH 37PH9UK TH 42PH9UK ...