Daewoo 531X Service Manual
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Contents
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3SERVICING PRECAUTIONS General Servicing Precautions1. Always unplug the AC power cord from the AC power source before:a. Removing or reinstalling any component, circuit board, module, or any other instrument assembly.b. Disconnecting or reconnecting any electrical plug or other electrical connection.c. Connecting a test substitute in parallel with an electrolytic capacitor in the instrument.d. Discharging the picture tube anode.2. Test high voltage only by measuring it with an appropriate high voltage meter or other voltagemeasuring device (DVM, FETVOM. etc.) equipped with a suitable high voltage probe. Do not test highvoltage by “drawing an arc”.3. Discharge the picture tube anode only by: (a) first connecting one end of an insulated clip lead to thedegaussing or line grounding system shield at the point where the picture tube socket ground lead isconnected, and then (b) touching the other end of the insulated clip lead to the picture tube anodebutton, using an insulating handle to avoid personal contact with high voltage.4. Do not any spray chemicals on or near this instrument, or any of its assemblies.5. Unless otherwise specified in this service manual, only clean electrical contacts by applying thefollowing mixture to the contacts with a pipe cleaner, cotton-tipped stick, or comparable nonabrasiveapplicator: 10% (by volume) Aceton and 90% (by volume) isopropyl alchohol (90%-99% strength).6. Do not damage any plug/socket B+ voltage interlocks with which instruments covered by this servicemanual might be equipped.7. Do not apply AC power to this instrument and/or any other of its electrical assemblies unless all thesolid-state device heat sinks are correctly installed.8. Always connect the test instrument ground lead to the appropriate instrument chassis ground beforeconnecting the test instrument positive lead. Always remove the test instrument ground lead last.9. Only use the test fixtures specified in this service manual with this instrument.CAUTION: Before servicing instruments covered by this service manual, its supplements, andaddendum, please read and follow the SAFETY PRECAUTIONS of this manual.NOTE: If unforeseen circumstances create conflict between the following servicing precautions and anyof the safety precautions on page 1 of this manual, always follow the safety precautions.Remember: Safety First.CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitorsmay result in a explosion.CAUTION: This is a flammable mixture. Unless specified in this service manual, lubrication of contacts isnot required.CAUTION: Do not connect the test fixture ground strap to any heatsink in this instrument. |
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