3
1 Safety Precautions
1.1.
General Guidelines
1. When conducting repairs and servicing, do not attempt to modify the equipment, its parts or its materials.
2. When wiring units (with cables, flexible cables or lead wires) are supplied as repair parts and only one wire or some of the
wires have been broken or disconnected, do not attempt to repair or re-wire the units. Replace the entire wiring unit instead.
3. When conducting repairs and servicing, do not twist the Fasten connectors but plug them straight in or unplug them straight
out.
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 (TOUCH 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-P50VT30E
Page 23: ...23 7 4 No Picture ...
Page 39: ...39 ...
Page 40: ...40 ...
Page 46: ...46 ...
Page 48: ...48 12 3 Wiring 2 ...
Page 49: ...49 12 4 Wiring 3 ...
Page 50: ...Model No TX P50VT30E J Schematic Diagram Note S 1 ...
Page 51: ...Model No TX P50VT30E J Replacement Parts List Note S 2 ...
Page 52: ...Model No TX P50VT30E J P Board 1 2 and P2 Board S 3 ...
Page 53: ...Model No TX P50VT30E J P Board 2 2 S 4 ...
Page 54: ...Model No TX P50VT30E J A Board 1 17 S 5 ...
Page 55: ...Model No TX P50VT30E J A Board 2 17 S 6 ...
Page 56: ...Model No TX P50VT30E J A Board 3 17 S 7 ...
Page 57: ...Model No TX P50VT30E J A Board 4 17 S 8 ...
Page 58: ...Model No TX P50VT30E J A Board 5 17 S 9 ...
Page 59: ...Model No TX P50VT30E J A Board 6 17 S 10 ...
Page 60: ...Model No TX P50VT30E J A Board 7 17 S 11 ...
Page 61: ...Model No TX P50VT30E J A Board 8 17 S 12 ...
Page 62: ...Model No TX P50VT30E J A Board 9 17 S 13 ...
Page 63: ...Model No TX P50VT30E J A Board 10 17 S 14 ...
Page 64: ...Model No TX P50VT30E J A Board 11 17 S 15 ...
Page 65: ...Model No TX P50VT30E J A Board 12 17 S 16 ...
Page 66: ...Model No TX P50VT30E J A Board 13 17 S 17 ...
Page 67: ...Model No TX P50VT30E J A Board 14 17 S 18 ...
Page 68: ...Model No TX P50VT30E J A Board 15 17 S 19 ...
Page 69: ...Model No TX P50VT30E J A Board 16 17 S 20 ...
Page 70: ...Model No TX P50VT30E J A Board 17 17 S 21 ...
Page 71: ...Model No TX P50VT30E J K S and V Board S 22 ...
Page 72: ...Model No TX P50VT30E J C1 Board S 23 ...
Page 73: ...Model No TX P50VT30E J C2 Board 1 2 S 24 ...
Page 74: ...Model No TX P50VT30E J C2 Board 2 2 S 25 ...
Page 75: ...Model No TX P50VT30E J C3 Board 1 2 S 26 ...
Page 76: ...Model No TX P50VT30E J C3 Board 2 2 S 27 ...
Page 77: ...Model No TX P50VT30E J SC Board 1 4 S 28 ...
Page 78: ...Model No TX P50VT30E J SC Board 2 4 S 29 ...
Page 79: ...Model No TX P50VT30E J SC Board 3 4 S 30 ...
Page 80: ...Model No TX P50VT30E J SC Board 4 4 S 31 ...
Page 81: ...Model No TX P50VT30E J SS Board 1 2 S 32 ...
Page 82: ...Model No TX P50VT30E J SS Board 2 2 and SS2 Board S 33 ...
Page 83: ...Model No TX P50VT30E J P Board Foil side S 34 ...
Page 84: ...Model No TX P50VT30E J P Board Component side S 35 ...
Page 85: ...Model No TX P50VT30E J P2 Board S 36 ...
Page 86: ...Model No TX P50VT30E J A Board Foil side S 37 ...
Page 87: ...Model No TX P50VT30E J A Board Component side S 38 ...
Page 88: ...Model No TX P50VT30E J K S and V Board S 39 ...
Page 89: ...Model No TX P50VT30E J C1 Board S 40 ...
Page 90: ...Model No TX P50VT30E J C2 Board S 41 ...
Page 91: ...Model No TX P50VT30E J C3 Board S 42 ...
Page 92: ...Model No TX P50VT30E J SC Board Foil side S 43 ...
Page 93: ...Model No TX P50VT30E J SC Board Component side S 44 ...
Page 94: ...Model No TX P50VT30E J SS Board Foil side S 45 ...
Page 95: ...Model No TX P50VT30E J SS Board Component side S 46 ...
Page 96: ...Model No TX P50VT30E J SS2 Board S 47 ...
Page 141: ...Model No TX P50VT30E J Exploded View 1 S 92 ...
Page 142: ...Model No TX P50VT30E J Exploded View 2 S 93 ...
Page 143: ...Model No TX P50VT30E J Packing 1 S 94 ...
Page 144: ...Model No TX P50VT30E J Packing 2 S 95 ...
