1-2. Servicing Precautions
Warning
• An electrolytic capacitor installed with the wrong polarity might explode.
Caution
• Before servicing units covered by this service manual, read and follow the Safety Precautions section of
this manual.
Note
• If unforeseen circumstances create conflict between the following servicing precautions and any of the
safety precautions, always follow the safety precautions.
Note
• Following the repair by a non-authorised service provider, self-repair or non-professional repair of the
product, Samsung is not liable for any damage to the product, any injury or any other product safety issue
caused by any attempt to repair the product which does not carefully follow these repair and maintenance
instructions. Any damage to the product caused by an attempt to repair the product by any person other
than a Samsung certified service provider will not be covered by the warranty.
1-2-1. General Servicing Precautions
1. Always unplug the unit’s AC power cord from the AC power source and disconnect the DC Power Jack before attempting to:
(a) remove or reinstall any component or assembly, (b) disconnect PCB plugs or connectors, (c) connect a test component
in parallel with an electrolytic capacitor.
2. Some components are raised above the printed circuit board for safety. An insulation tube or tape is sometimes used.
The internal wiring is sometimes clamped to prevent contact with thermally hot components. Reinstall all such elements to
their original position.
3. After servicing, always check that the screws, components and wiring have been correctly reinstalled.
Make sure that the area around the serviced part has not been damaged.
4. Check the insulation between the blades of the AC plug and accessible conductive parts (examples: metal panels, input
terminals and earphone jacks).
5. Insulation Checking Procedure: Disconnect the power cord from the AC source and turn the power switch ON.
Connect an insulation resistance meter (500V) to theblades of the AC plug.
The insulation resistance between each blade of the AC plug and accessible conductive parts (see above) should be greater
than 1 megohm.
6. Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the positive lead;
always remove the instrument’s ground lead last.
1-3
Precautions
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