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8) Before returning the set to your customer, always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, screwheads, metal overlays, control shafts etc. to
be sure the set is safe to operate without danger of electrical shock. Plug the AC line cord directly into a
220V AC outlet (do not use a line isolation transformer during this check). Use an AC voltmeter having
5000 ohms per volt or more sensitivity in the following manner:
Connect a 1500 ohm 10 watt resistor, paralleled by a 0.15µF, AC type capacitor, between a known good
earth ground (water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure the AC
voltage across the combination of 1500 ohm resistor and 0. 15µF capacitor. Reverse the AC plug at the AC
outlet and repeat AC voltage measurements for each exposed metallic part. Voltage measured must not
exceed 0.3 volts RMS. This corresponds to o.2 milliamp. AC. Any value exceeding this limit constitutes a
potential shock hazard and must be corrected immediately.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in the chassis have special safety-related characteristics. These
characteristics are often passed unnoticed by a visual inspection and the X-RAY RADIATION protection
afforded by them cannot necessarily be obtained by using replacement components rated for higher wattage,
etc. Replacement parts which have these special safety characteristics are identified in this manual and its
supplement electrical components having such features are shaded on the schematic diagram and the parts list.
Before replacing any of these components, read the parts list in this manual carefully. The use of substitute
replacement parts which do not have the same characteristics as specified in the parts list may create shock,
fire, X-RAY RADIATION or other hazards.
B+ CHECK
1) Prepare the test equipment.
2) Use the DC voltameter at DC 370V position to test B+ test point, i.e. B+.
AC VOLTMETER
Place this probe on
each exposed
metallic part.
Good earth ground
such as a water
pipe, conduit, etc.
1500ohm
10watt
0.15 FD
μ
Summary of Contents for M2019
Page 1: ...COLOR TELEVISION M2019 TS2019 ...
Page 14: ...12 ...
Page 17: ...15 1 2 3 4 5 6 7 8 9 10 11 12 Vcc GND AN7522N ...
Page 18: ...16 Power Amplifier Thermal Protection Flyback Generator 1 7 4 5 3 6 2 TEA8172 ...
Page 39: ...18 ...