Precautions
1-2 Servicing Precautions
Warning 1 : First read the OSafety Precautions� section of this manual. If some unforeseen circumstance creates a
conflict between the servicing and safety precautions, always follow the safety precautions.
Warning 2 : An electrolytic capacitor installed with the wrong polarity might explode.
1. Servicing precautions are printed on the 6. Insulation Checking Procedure: Disconnect the
cabinet. Follow them.power cord from the AC source and turn the
power switch ON. Connect an insulation
2. Always unplug the unitOs AC power cord fromresistance meter (500V) to the blades of the AC
the AC power source before attempting to: (a)plug.
Remove or reinstall any component or
assembly, (b) Disconnect an electrical plug orThe insulation resistance between each blade
connector, (c) Connect a test component inof the AC plug and accessible conductive parts
parallel with an electrolytic capacitor.(see above) should be greater than 1 megohm.
3. Some components are raised above the printed7. Never defeat any of the B+ voltage interlocks.
circuit board for safety. An insulation tube orDo not apply AC power to the unit (or any of
tape is sometimes used. The internal wiring isits assemblies) unless all solid-state heat sinks
sometimes clamped to prevent contact withare correctly installed.
thermally hot components. Reinstall all such
elements to their original position.8. Always connect a test instrumentOs ground
lead to the instrument chassis ground before
4. After servicing, always check that the screws,connecting the positive lead; always remove
components and wiring have been correctlythe instrumentOs ground lead last.
reinstalled. Make sure that the portion around
the serviced part has not been damaged.9. When some parts inside the optical engine
(except lamp) are damaged, replace the whole
5. Check the insulation between the blades of theoptical engine.
AC plug and accessible conductive parts
(examples: metal panels, input terminals and
earphone jacks).
OCAUTION : Double-pole/neutral fusing�
Samsung Electronics1-3 |
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