Handling replaceable units
This section describes the precautions that you must take and the general procedures
that you must follow when removing, installing, and storing any replaceable unit.
Avoiding electrostatic discharge (ESD) damage
When replacing or installing hardware units, you can inadvertently damage the
sensitive electronic circuits in the equipment by simply touching them. Electrostatic
charge that has accumulated on your body discharges through the circuits. If the air in
the work area is very dry, running a humidifier in the work area will help decrease the
risk of ESD damage. Follow the procedures below to prevent damage to the
equipment.
Be aware of the following requirements:
l
Provide enough room to work on the equipment.
l
Clear the work site of any unnecessary materials or materials that naturally build
up electrostatic charge, such as foam packaging, foam cups, cellophane wrappers,
and similar items.
l
Do not remove replacement or upgrade units from their antistatic packaging until
you are ready to install them.
l
Before you begin service, gather together the ESD kit and all other materials you
will need.
l
Once servicing begins, avoid moving away from the work site; otherwise, you may
build up an electrostatic charge.
l
Use ESD anti-static gloves or an ESD wristband (with strap).
If using an ESD wristband with a strap:
n
Attach the clip of the ESD wristband to the ESD bracket or bare metal on a
cabinet/rack or enclosure.
n
Wrap the ESD wristband around your wrist with the metal button against your
skin.
n
If a tester is available, test the wristband.
Emergency procedures (without an ESD kit)
In an emergency when an ESD kit is not available, use the following precautions to
reduce the possibility of an electrostatic discharge by ensuring that your body and the
subassembly are at the same electrostatic potential.
NOTICE
These precautions are not a substitute for the use of an ESD kit. Follow them only in
the event of an emergency.
l
Before touching any unit, touch a bare (unpainted) metal surface of the cabinet/
rack or enclosure.
l
Before removing any unit from its antistatic bag, place one hand firmly on a bare
metal surface of the cabinet/rack or enclosure, and at the same time, pick up the
unit while it is still sealed in the antistatic bag. Once you have done this, do not
Safety precautions for handling replaceable units
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Unity 480/F, Unity 680/F, Unity 880/F
Installation and Service Guide
