"For pluggable equipment, the socket-outlet shall be installed near SAFETY NOTICE:
the
equipment and shall be easily accessible.
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.
5. Check the insulation between the blades of the 1.
Servicing precautions are printed on the cabinet.
AC plug and accessible conductive parts
Follow them.
(examples : metal panels and input terminals).
2. Always unplug the units AC power cord from
6. Insulation Checking Procedure:
the AC power source before attempting to:
Disconnect the power cord from the AC source
(a) Remove or reinstall any component or and turn the power switch ON. Connect an
assembly (b) Disconnect an electrical plug or insulation resistance meter (500V) to the
connector (c) Connect a test component in
blades of AC plug.
parallel with an electrolytic capacitor
The insulation resistance between each blade
3. Some components are raised above the printed of the AC plug and accessible conductive parts
circuit board for safety. An insulation tube or
(see above) should be greater than 1 megaohm.
tape is sometimes used. The internal wiring is sometimes clamped to prevent contact with 7. Never defeat
any of the B+ voltage interlocks. thermally hot components. Reinstall all such Do not apply AC power to the
unit (or any of its elements to their original position. assemblies) unless all solid-state heat sinks are 4. After
servicing, always check that the screws, correctly installed.
components and wiring have been correctly 8. Always connect an instrument’s ground lead to reinstalled.
Make sure that the portion around the instrument chassis ground before the serviced part has not been
damaged. connecting the positive lead ; always remove the instrument’s ground lead last.
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.)
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