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1 Precautions
1-2 Servicing Precautions
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Warning: An electrolytic capacitor installed with the wrong polarity might explode.
Caution: Before servicing instruments covered by this service manual and its supplements, 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.
1-2-1 General Servicing Precautions
1.
Servicing precautions are printed on the
cabinet. Follow them.
Always unplug the unit's AC power cord
from the AC power source before attempting
to: (a) remove or reinstall any component or
assembly, (b) disconnect an electrical plug or
connector, (c) connect a test component in par-
allel with an electrolytic capacitor.
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.
After servicing, always check that the screws,
components and wiring have been correctly
reinstalled. Make sure that the portion around
the serviced part has not been damaged.
Check the insulation between the blades of the
AC plug and accessible conductive parts
(examples: metal panels, input terminals and
earphone jacks).
Insulation Checking Procedure: Disconnect the
power cord from the AC source and turn the
power switch ON. Connect an insulation
resistance meter (500 V) to the blades 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.
Never defeat any of the B+ voltage interlocks.
Do not apply AC power to the unit (or any of
its assemblies) unless all solid-state heat sinks
are correctly installed.
8.
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.
1-2-2. Insulation Checking Procedure
Disconnect the attachment plug from the AC
outlet and turn the power on. Connect the
insulation resistance meter (500 V) to the blades of
the attachment plug. The insulation resistance
between each blade of the attachment plug and
accessible conductive parts (see note) should be
more than 1 Mega ohm.
Note: Accessible conductive parts include metal
panels, input terminals, earphone jacks, etc.
Samsung Electronics SyncMaster 15GLi
1-3
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