ESD/Repair
V
material in which the replacement assembly was shipped. If this should
not be the case, any claim for a possible refund will be null and void.
• Unpacked ESD sensitive components should only be handled in ESD
protected areas (EPA, e.g. area for field service, repair or service bench)
and only be touched by persons who wear a wristlet that is connected to
the ground potential of the repair or service bench by a series resistor.
The equipment to be repaired or serviced as well as all tools and electri-
cally semi-conducting work, storage, and floor mats should also be con-
nected to this ground potential.
• The terminals of ESD sensitive components must not come in uncon-
trolled contact with electrostatically chargeable (voltage puncture) or
metallic surfaces (discharge shock hazard).
• To prevent undefined transient stress of the components and possible
damage due to inadmissible voltages or compensation currents, electri-
cal connections should only be established or separated when the
equipment is switched off and after any capacitor charges have decayed.
E Repair
Removal of housing parts, shields, etc. exposes energized parts. For this
reason the following precautions must be observed:
• Maintenance may only be performed by trained personnel in accordance
with the applicable regulations.
• The equipment must be switched off and disconnected from the AC
power outlet before any housing parts are removed.
• Even if the equipment is disconnected from the power outlet, parts with
hazardous charges (e.g. capacitors, picture tubes) must not be touched
until they have been properly discharged. Do not touch hot components
(power semiconductors, heat sinks, etc.) before they have cooled off.
• If maintenance is performed on a unit that is opened and switched on, no
un-insulated circuit components and metallic semiconductor housings
must be touched, neither with your bare hands nor with un-insulated
tools.
Certain components pose additional hazards:
• Explosion hazard from lithium batteries, electrolytic capacitors and
power semiconductors (watch the component’s polarity. Do not short
battery terminals. Replace batteries only by the same type).
• Implosion hazard from evacuated display units.
• Radiation hazard from laser units (non-ionizing), picture tubes (ioniz-
ing).
• Caustic effect of display units (LCD) and components containing liquid
electrolyte.
Such components should only be handled by trained personnel who are
properly protected (e.g. safety goggles, gloves).
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