Page 3-2 V10/V7.5/V5/V3.5 Installation and Operation Manual
Issue 3.5 Section 3 Operating Instructions
3.4 ELECTROSTATIC DISCHARGE
PROTECTION
The transmitter's assemblies contain
semiconductor devices that are susceptible to
damage from electrostatic discharge (ESD).
Observe the following precautions when
handling an assembly that contains these
devices:
NOTE
Electrostatic energy is produced when two
insulating materials are rubbed together. A
person wearing rubber-soled shoes, walking
across a nylon carpet or a waxed floor can
generate an extremely large electrostatic
charge. This effect is magnified during
periods of low humidity.
This high voltage may damage
semiconductor devices such as integrated
circuits, field-effect transistors, thyristors and
Schottky diodes unless adequate precautions
are taken.
3.4.1 Discharging of Personnel
Maintainers must be electrically discharged
by a suitable ground system (anti-static mats,
grounding straps) when removing an
assembly from the transmitter and while
handling the assembly for maintenance
procedures.
3.4.2 Handling/Storage
Place the assembly in an anti-static bag when
it is not installed in a host transmitter or when
it is not being subjected to maintenance
procedures. Electronic components should be
stored in anti-static materials.
3.4.3 Tools/Test Equipment
Testing and maintenance equipment,
including soldering and unsoldering tools,
should be suitable for contact with static
sensitive semiconductor devices.
3.4.4 Stress Current Protection
Always ensure the static sensitive
semiconductor devices are protected from
unnecessary stress current. This is achieved
by ensuring:
• Current is not flowing when an electrical
connection is broken.
• Voltages are not present on external
control/monitoring circuits when they are
connected.
3.5 CONTROLS AND INDICATORS
Nautel recommends the operator/maintainer
be familiar with the transmitter's controls and
indicators before operating the transmitter
and/or attempting to perform fault diagnostics.
In most cases, controls and indicators are
presented in an assembly-by-assembly
format. A mechanical drawing and an
associated table are provided as aids to
locating and understanding the assembly’s
controls and indicators.
NOTE
On some mechanical drawings, numbered
callouts are provided to cross-reference the
control/indicator to the description table.
The names used in the PANEL MARKING
column of the controls and indicators tables
are intended to be the closest possible
representation to the item’s label/silkscreen.
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