AOC CM-736, Руководство по обслуживанию

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2. PRECAUTIONS AND NOTICES
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SAFETY PRECAUTIONS
1. Observe all caution and safety related notes located inside the display cabinet.
2. Operation of the display with the cover removed, may cause a serious, shock hazard from the
display power supply. Work on the display should not be attempted by anyone who is not
thoroughly familiar with precautions necessary when working on high voltage equipment.
3. Do not install, remove or handle the picture tube in any manner unless shatter-proof goggles are
worn. People who are not so equipped should be kept away while handling picture tube. Keep
picture tube away from the body while handling.
4. The picture tube is constructed to limit X-RAY radiation to 0.5 mR/HR. For continued
protection,use the designated replacement tube only, and adjust the voltages so that the designat
-ed maximum rating at the anode will not be exceeded.
5. Before returning a serviced display to the customer, a thorough safety test must be performed
to verify that the display is safe to operate without danger or shock. Always perform an AC
leakage current check on the exposed metallic parts of the cabinet, such as screwheads. Test
method for current leakage is described as follow.
(a) Plug the AC line cord directly into rated AC outlet (do not use a line isolation transformer
during this check).
(b) Use an AC voltameter having 5000 ohms per volt or with more sensitivity in the following
manner : Connect a 1500 ohms 10 Watt resistor, paralleled by a O.15mfd, AC type capacitor
between a known good earth ground (water pipe, conduit, etc.) and the exposed metallic
parts simultaneously. Measure the AC voltage across the combination of 1500 ohms
resistor and 0.15mfd capacitor.
(c) Reverse the AC plug at the AC outlet and repeat AC voltage measurements for each exposed
metal lic part.
(d) Voltage measured must not exceed 2.8 volts RMS. This corresponds to 2 milliamp AC.
Any value exceeding this limit constitutes a potential shock hazard and must be corrected
immediately.
2 - 2 PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety visual inspections and the
protection afforded by them cannot necessarily be obtained by using replacement components
rated for higher voltage, wattage, etc. 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 safety
characteristics as specified in the parts list may create
shock, fire, X-RAY radiation or other
hazards.
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