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 TX-P50S20B
Page 20: ...20 7 4 No Picture ...
Page 40: ...40 12 3 Wiring 2 ...
Page 41: ...41 12 4 Wiring 3 ...
Page 42: ...42 ...
Page 43: ...43 13 Schematic Diagram 13 1 Schematic Diagram Note ...
Page 83: ...83 A B C D E F G H I 1 2 3 4 5 6 P BOARD COMPONENT SIDE ETX2MM806MEH ...
Page 96: ...96 15 1 2 Exploded View 2 ...
Page 97: ...97 15 1 3 Packing 1 ...
Page 98: ...98 15 1 4 Packing 2 ...
Page 99: ...99 15 1 5 Mechanical Replacement Parts List ...
Page 102: ...102 15 2 Electrical Replacement Parts List 15 2 1 Replacement Parts List Notes ...
