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 TH-P42XT50D
Page 21: ...21 7 4 No Picture ...
Page 30: ...30 ...
Page 36: ...36 ...
Page 38: ...38 11 3 Wiring 2 11 4 Wiring 3 ...
Page 39: ...Model No TH P42XT50D G M P S Schematic Diagram Note S 1 ...
Page 40: ...Model No TH P42XT50D G M P S Replacement Parts List Note S 2 ...
Page 41: ...Model No TH P42XT50D G M P S A Board 1 14 S 3 ...
Page 42: ...Model No TH P42XT50D G M P S A Board 2 14 S 4 ...
Page 43: ...Model No TH P42XT50D G M P S A Board 3 14 S 5 ...
Page 44: ...Model No TH P42XT50D G M P S A Board 4 14 S 6 ...
Page 45: ...Model No TH P42XT50D G M P S A Board 5 14 S 7 ...
Page 46: ...Model No TH P42XT50D G M P S A Board 6 14 and K Board S 8 ...
Page 47: ...Model No TH P42XT50D G M P S A Board 7 14 S 9 ...
Page 48: ...Model No TH P42XT50D G M P S A Board 8 14 S 10 ...
Page 49: ...Model No TH P42XT50D G M P S A Board 9 14 S 11 ...
Page 50: ...Model No TH P42XT50D G M P S A Board 10 14 S 12 ...
Page 51: ...Model No TH P42XT50D G M P S A Board 11 14 S 13 ...
Page 52: ...Model No TH P42XT50D G M P S A Board 12 14 S 14 ...
Page 53: ...Model No TH P42XT50D G M P S A Board 13 14 S 15 ...
Page 54: ...Model No TH P42XT50D G M P S A Board 14 14 S 16 ...
Page 55: ...Model No TH P42XT50D G M P S C1 Board S 17 ...
Page 56: ...Model No TH P42XT50D G M P S C2 Board S 18 ...
Page 57: ...Model No TH P42XT50D G M P S SN Board 1 4 S 19 ...
Page 58: ...Model No TH P42XT50D G M P S SN Board 2 4 S 20 ...
Page 59: ...Model No TH P42XT50D G M P S SN Board 3 4 S 21 ...
Page 60: ...Model No TH P42XT50D G M P S SN Board 4 4 S 22 ...
Page 61: ...Model No TH P42XT50D G M P S A Board Foil Side S 23 ...
Page 62: ...Model No TH P42XT50D G M P S A Board Component Side S 24 ...
Page 63: ...Model No TH P42XT50D G M P S K Board S 25 ...
Page 64: ...Model No TH P42XT50D G M P S C1 Board S 26 ...
Page 65: ...Model No TH P42XT50D G M P S C2 Board S 27 ...
Page 66: ...Model No TH P42XT50D G M P S SN Board S 28 ...
Page 86: ...Model No TH P42XT50D G M P S Exploded View 1 S 48 ...
Page 87: ...Model No TH P42XT50D G M P S Exploded View 2 S 49 ...
Page 88: ...Model No TH P42XT50D G M P S Accessories S 50 ...
