3
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.
4. 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.
5. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
6. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.
1.2.
Touch-Current Check
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2. Connect a measuring network for touch currents 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 Leakage Current Tester (Simpson 228 or equivalent) to measure the potential across the measuring network.
4. Check each exposed metallic part, and measure the voltage at each point.
5. Reserve the AC plug in the AC outlet and repeat each of the above measure.
6. The potential at any point (TOUGH CURRENT) expressed as voltage U
1
and U
2
, does not exceed the following values:
For a. c.: U
1
= 35 V (peak) and U
2
= 0.35 V (peak);
For d. c.: U
1
= 1.0 V,
Note:
The limit value of U
2
= 0.35 V (peak) for a. c. and U
1
= 1.0 V for d. c. correspond to the values 0.7 mA (peak) a. c. and 2.0
mA d. c.
The limit value U
1
= 35 V (peak) for a. c. correspond to the value 70 mA (peak) a. c. for frequencies greater than 100 kHz.
7. In case a measurement is out 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
Summary of Contents for TH-P54Z1D
Page 24: ...24 6 4 No Picture ...
Page 41: ...41 9 1 4 Adjustment Volume Location 9 1 5 Test Point Location ...
Page 42: ...42 ...
Page 54: ...54 11 3 Wiring Display unit 1 11 4 Wiring Display unit 2 ...
Page 55: ...55 11 5 Wiring Display unit 3 11 6 Wiring Display unit 4 ...
Page 56: ...56 11 7 Wiring Display unit 5 11 8 Wiring Display unit 6 ...
Page 57: ...57 12 Schematic Diagram 12 1 Schematic Diagram Note ...
Page 146: ...146 ...
Page 148: ...148 14 1 2 Exploded View 2 Display unit ...
Page 149: ...149 14 1 3 Exploded View 3 Display unit ...
Page 150: ...150 14 1 4 Packing 1 ...
Page 151: ...151 14 1 5 Packing 2 ...
Page 152: ...152 14 1 6 Packing 3 ...
Page 153: ...153 14 1 7 Packing 4 Pedestal stand ...
Page 154: ...154 14 1 8 Packing 5 ...
Page 155: ...155 14 1 9 Packing 6 ...
Page 156: ...156 14 1 10 Packing 7 ...
Page 162: ...162 14 2 Electrical Replacement Parts List 14 2 1 Replacement Parts List Notes ...
