1.1.1. Leakage Current Cold Check
1. Unplug the AC cord and connect a jumper between the two
prongs on the plug.
2. Measure the resistance value, with an ohmmeter, between
the jumpered AC plug and each exposed metallic cabinet
part on the equipment such as screwheads, connectors,
control shafts, etc. When the exposed metallic part has a
return path to the chassis, the reading should be between
1M
Ω
and 5.2M
Ω
.
When the exposed metal does not have a return path to
the chassis, the reading must be
.
Figure 1
1.1.2. Leakage Current Hot Check (See
Figure 1.)
1. Plug the AC cord directly into the AC outlet. Do not use an
isolation transformer for this check.
2. Connect a 1.5k
Ω
, 10 watts resistor, in parallel with a 0.15µF
capacitors, 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 an AC voltmeter, with 1000 ohms/volt or more
sensitivity, to measure the potential across the resistor.
4. Check each exposed metallic part, and measure the
voltage at each point.
5. Reverse the AC plug in the AC outlet and repeat each of the
above measurements.
6. The potential at any point should not exceed 0.75 volts
RMS. A leakage current tester (Simpson Model 229 or
equivalent) may be used to make the hot checks, leakage
current
must
not
exceed
1/2
milliamp.
In
case
a
measurement is outside 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.
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
TH-42PW4 / TH-42PWD4
Содержание Viera TH-42PW4
Страница 7: ...4 Service Hint 7 TH 42PW4 TH 42PWD4 ...
Страница 8: ...5 Location of Lead Wiring 8 TH 42PW4 TH 42PWD4 ...
Страница 32: ...10 Option Setting How to access the Option menu 32 TH 42PW4 TH 42PWD4 ...
Страница 34: ...34 TH 42PW4 TH 42PWD4 ...
Страница 35: ...11 IC Block Diagram TH 42PW4 TH 42PWD4 35 ...
Страница 36: ...INPUTA A TH 42PW4 TH 42PWD4 36 ...
Страница 38: ...12 2 P Board US model A B C D E F G H I 1 2 3 4 5 6 P BOARD FOIL SIDE TXN P10JAS TH 42PW4 TH 42PWD4 38 ...
Страница 40: ...A B C D E F G H I 1 2 3 4 5 6 P BOARD COMPONENT SIDE US Model TXN P10JAS TH 42PW4 TH 42PWD4 40 ...
Страница 41: ...12 3 P1 Board Except US A B C D E F G H I 1 2 3 4 5 6 P1 BOARD FOIL SIDE TXNP11JASE TH 42PW4 TH 42PWD4 41 ...
Страница 43: ...A B C D E F G H I 1 2 3 4 5 6 P1 BOARD COMPONENT SIDE Except US TXNP11JASE TH 42PW4 TH 42PWD4 43 ...
Страница 73: ...13 5 P Board US model Schematic Diagrams TH 42PW4 TH 42PWD4 73 ...
Страница 75: ...13 7 P1 Board Except US Schematic Diagrams TH 42PW4 TH 42PWD4 75 ...
Страница 76: ...13 8 F and P3 Board Except US Schematic Diagram TH 42PW4 TH 42PWD4 76 ...
Страница 77: ...13 9 P5 P6 P7 and P8 Board Except US Schematic diagram TH 42PW4 TH 42PWD4 77 ...
Страница 79: ...13 11 HX Board Schematic Diagrams TH 42PW4 TH 42PWD4 79 ...
Страница 80: ...13 12 H Board Option TY 42TM4H Schematic Diagram TXN H10JKS TH 42PW4 TH 42PWD4 80 ...
Страница 82: ...13 14 HY Board 1 2 Option TY 42TM4Y Schematic Diagrams TH 42PW4 TH 42PWD4 82 ...
Страница 83: ...13 15 HY Board 2 2 Option TY 42TM4Y Schematic Diagrams TH 42PW4 TH 42PWD4 83 ...
Страница 84: ...13 16 HZ Board 1 2 Option TY 42TM4Z Schematic Diagram TH 42PW4 TH 42PWD4 84 ...
Страница 85: ...13 17 HZ Board 2 2 Option TY 42TM4Z Schematic Diagram TH 42PW4 TH 42PWD4 85 ...
Страница 87: ...13 19 J Board 1 5 Schematic Diagrams TH 42PW4 TH 42PWD4 87 ...
Страница 88: ...13 20 J Board 2 5 Schematic Diagrams TH 42PW4 TH 42PWD4 88 ...
Страница 89: ...13 21 J Board 3 5 and H3 Board Schematic Diagrams TH 42PW4 TH 42PWD4 89 ...
Страница 90: ...13 22 J Board 4 5 Schematic Diagrams TH 42PW4 TH 42PWD4 90 ...
Страница 91: ...13 23 J Board 5 5 Schematic Diagrams TH 42PW4 TH 42PWD4 91 ...
Страница 93: ...13 25 D Board 1 14 Schematic Diagrams TH 42PW4 TH 42PWD4 93 ...
Страница 94: ...13 26 D Board 2 14 Schematic Diagrams TH 42PW4 TH 42PWD4 94 ...
Страница 95: ...13 27 D Board 3 14 Schematic Diagrams TH 42PW4 TH 42PWD4 95 ...
Страница 96: ...13 28 D Board 4 14 Schematic Diagrams TH 42PW4 TH 42PWD4 96 ...
Страница 97: ...13 29 D Board 5 14 Schematic Diagrams TH 42PW4 TH 42PWD4 97 ...
Страница 98: ...13 30 D Board 6 14 Schematic Diagrams TH 42PW4 TH 42PWD4 98 ...
Страница 99: ...13 31 D Board 7 14 Schematic Diagrams TH 42PW4 TH 42PWD4 99 ...
Страница 100: ...D Board Schematic Diagram is Continued TH 42PW4 TH 42PWD4 100 ...
Страница 101: ...13 32 D Board 8 14 Schematic Diagrams TH 42PW4 TH 42PWD4 101 ...
Страница 102: ...13 33 D Board 9 14 Schematic Diagrams TH 42PW4 TH 42PWD4 102 ...
Страница 103: ...13 34 D Board 10 14 Schematic Diagrams TH 42PW4 TH 42PWD4 103 ...
Страница 104: ...13 35 D Board 11 14 Schematic Diagrams TH 42PW4 TH 42PWD4 104 ...
Страница 105: ...13 36 D Board 12 14 Schematic Diagrams TH 42PW4 TH 42PWD4 105 ...
Страница 106: ...13 37 D Board 13 14 Schematic Diagrams TH 42PW4 TH 42PWD4 106 ...
Страница 107: ...13 38 D Board 14 14 Schematic Diagrams TH 42PW4 TH 42PWD4 107 ...
Страница 108: ...13 39 C1 Board Schematic Diagrams TH 42PW4 TH 42PWD4 108 ...
Страница 109: ...13 40 C2 Board Schematic Diagrams TH 42PW4 TH 42PWD4 109 ...
Страница 110: ...13 41 C3 Board and V1 Board Schematic Diagrams TH 42PW4 TH 42PWD4 110 ...
Страница 111: ...13 42 C4 Board Schematic Diagrams TH 42PW4 TH 42PWD4 111 ...
Страница 113: ...13 44 SC Board 1 2 Schematic Diagrams TH 42PW4 TH 42PWD4 113 ...
Страница 114: ...13 45 SC Board 2 2 Schematic Diagrams TH 42PW4 TH 42PWD4 114 ...
Страница 116: ...13 47 SU Board Schematic Diagrams TH 42PW4 TH 42PWD4 116 ...
Страница 117: ...13 48 SD Board Schematic Diagrams TH 42PW4 TH 42PWD4 117 ...
Страница 119: ...13 50 SS SS2 SS3 and S1 Board Schematic Diagrams TH 42PW4 TH 42PWD4 119 ...
Страница 120: ...TH 42PW4 TH 42PWD4 120 ...
Страница 122: ...TH 42PW4 TH 42PWD4 122 ...
Страница 126: ...16 Replacement Parts List 16 1 Relpacement Parts List Notes 126 TH 42PW4 TH 42PWD4 ...
