2 Safety Precautions
2.1. 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 Faston 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.
2.2. 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
6
TH-42PX7A / TH-42PV7AZ / TH-42PV7HS / TH-42PV7M / TH-42PV7MR
Summary of Contents for Viera TH-42PX7A
Page 5: ...1 Applicable signals 5 TH 42PX7A TH 42PV7AZ TH 42PV7HS TH 42PV7M TH 42PV7MR ...
Page 22: ...9 4 No Picture 22 TH 42PX7A TH 42PV7AZ TH 42PV7HS TH 42PV7M TH 42PV7MR ...
Page 34: ...34 TH 42PX7A TH 42PV7AZ TH 42PV7HS TH 42PV7M TH 42PV7MR ...
Page 106: ...TH 42PX7A TH 42PV7AZ TH 42PV7HS TH 42PV7M TH 42PV7MR 106 ...
Page 108: ...16 2 Packing Exploded Views 1 108 TH 42PX7A TH 42PV7AZ TH 42PV7HS TH 42PV7M TH 42PV7MR ...
Page 109: ...16 3 Packing Exploded Views 2 109 TH 42PX7A TH 42PV7AZ TH 42PV7HS TH 42PV7M TH 42PV7MR ...
Page 110: ...16 4 Packing Exploded Views 3 110 TH 42PX7A TH 42PV7AZ TH 42PV7HS TH 42PV7M TH 42PV7MR ...
Page 111: ...16 5 Accessory 111 TH 42PX7A TH 42PV7AZ TH 42PV7HS TH 42PV7M TH 42PV7MR ...
Page 112: ...16 6 Replacement Parts List Notes 112 TH 42PX7A TH 42PV7AZ TH 42PV7HS TH 42PV7M TH 42PV7MR ...
