picture tube to the CRT ground of receiver beforehandling the tube.
8. After servicing make the following leakage current checks to
prevent the customer from being exposed to shock hazards.
1.2. LEAKAGE CURRENT COLD CHECK
1. Unplug the AC cord and connect a jumper between the two prongs
on the plug.
2. For physically operated power switches, turn power on. Otherwise
skip step 2.
3. Measure the resistance value, with an ohmmeter, between the
jumpered AC plug and each exposed metallic cabinet part on the
receiver, such as screwheads, connectors, etc. When the exposed
metallic part has a return path to the chassis, the readingshould
be between 1 M and 12 M . When the exposed metal does not
have a return path to the chassis, the reading must be infinity.
1.3. LEAKAGE CURRENT HOT CHECK
1. Plug the AC cord directly into the AC outlet.
Do not use a isolation transformer for this check.
2. Connect a 1.5 k , 10 W resistor, in parallel with a 0.15 F
capacitor, between each exposed metallic part on the set and a
good earth ground, as shown in Figure 1.
3. Use an AC voltmeter, with 1 k /V 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 V RMS.
A leakage current tester (Simpson Model 229 equivalent) may be
used to make the hot checks. Leakage current must not exceed 1/2
mA. In case a measurement is outside of the limits specified, there
is a possibility of shock hazard, and thereceiver should be
repaired and rechecked before it is returned to the customer.
Figure 1
4
Summary of Contents for PV 20DF63
Page 1: ...ORDER NO MKE0303602C1 B6 B22 TV DVD Combination PV 20DF63 PV 27DF63 SPECIFICATIONS 1 ...
Page 15: ...5 1 8 WIRE AND LEAD POSITION DIAGRAM Fig 8 15 ...
Page 18: ...Fig D2 18 ...
Page 19: ...Fig D3 19 ...
Page 20: ...6 1 1 1 Notes in chart 1 Removal of DVD Ass y Fig D4 20 ...
Page 38: ...7 3 TEST POINTS AND CONTROL LOCATION 38 ...
Page 41: ...11 2 CHASSIS FRAME SECTION 2 41 ...
Page 42: ...11 3 CHASSIS FRAME SECTION 3 42 ...
Page 43: ...11 4 PACKING PARTS AND ACCESSORIES SECTION 43 ...
Page 54: ...R6012 ERJ6GEYJ561V MGF CHIP 1 10W 560 54 ...
Page 90: ...13 2 CHASSIS FRAME SECTION 2 90 ...
Page 91: ...13 3 CHASSIS FRAME SECTION 3 91 ...
Page 92: ...13 4 PACKING PARTS AND ACCESSORIES SECTION 92 ...
