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Precaution Statements
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 and input terminals).
Insulation Checking Procedure: Disconnect
the power cord from the AC source and turn
the power switch ON. Connect an insulation
resistance meter (500V) 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.
Always connect an 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 for Electrostatically Sensitive Devices (ESDs)
1,
1-2
Some semiconductor ("solid state") devices are
easily damaged by static electricity. Such
components are called Electrostatically
Sensitive Devices (ESDs); examples include
integrated circuits and some field-effect
transistors. The following techniques will
reduce the occurrence of component damage
caused by static electricity.
Immediately before handling any
semiconductor components or assemblies,
drain the electrostatic charge from your body
by touching a known earth ground.
Alternatively, wear a discharging wrist-strap
device. (Be sure to remove it prior to applying
power - this is an electric shock precaution.)
After removing an ESD-equipped assembly,
place it on a conductive surface such as
aluminum foil to prevent accumulation of
electrostatic charge.
Do not use freon-propelled chemicals. These
can generate electrical charges that damage
ESDs.
Use only a grounded-tip soldering iron when
soldering or unsoldering ESDs.
Use only an anti-static solder removal device.
Many solder removal devices are not rated as
"anti-static," these can accumulate sufficient
electrical charge to damage ESDs.
Do not remove a replacement ESD from its
protective package until you are ready to
install it. Most replacement ESDs are packaged
with leads that are electrically shorted together
by conductive foam, aluminum foil or other
conductive materials.
8.
Samsung
immediately before removing the protective
material from the leads of a replacement ESD,
touch the protective material to the chassis or
circuit assembly into which the device will be
installed.
Minimize body motions when handling
unpackaged replacement ESDs. Motions such
as brushing clothes together, or lifting a foot
from a carpeted floor can generate enough
static electricity to damage an ESD.
SER-6500 / SER-6540 / SER-6540F
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