Bedienungsanleitung Samsung Sam4S SPS-325 (Seite 4 von 291) (Englisch)

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1-2 Servicing Precautions

WARNING: First read the-Safety Precautions-section of this manual. If some unforeseen circumstance creates a

conflict between the servicing and safety precautions, always follow the safety precautions.

WARNING: An electrolytic capacitor installed with the wrong polarity might explode.

1. Servicing precautions are printed on the cabinet.

Follow them.

2. Always unplug the units 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

electrolytic capacitor

3. 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.

4. 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.

5. Check the insulation between the blades of the AC

plug and accessible conductive parts (examples :

metal panels and input terminals).

6. 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 AC plug.

The insulation resistance between each blade of the

AC plug and accessible conductive parts (see

above) should be greater than 1 megohm.

7. 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 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. 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.

2. 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.)

3. After removing an ESD-equipped assembly, place

it on a conductive surface such as aluminum foil to

prevent accumulation of electrostatic charge.

4. Do not use freon-propelled chemicals. These can

generate electrical charges that damage ESDs.

5. Use only a grounded-tip soldering iron when

soldering or unsoldering ESDs.

6. 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.

7. 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. 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.

9. 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.

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