156 Netfinity 3500-M20 – Type 8657 Models 21Y, 22Y, 31Y, 32Y,
• Wear safety glasses when you are: hammering, drilling
soldering, cutting wire, attaching springs, using sol-
vents, or working in any other conditions that might be
hazardous to yo ur eyes.
• After service, reinstall all safety shields, guards, labels,
and ground wires. Re plac e any sa fety device that is
wo rn or de fec ti ve .
• Reinstall al l cove rs correctly before returning the
mac hine to th e customer.

El ectric al safety

CAUTION:
Electrical current from power, telephone, and communi-
cation cables can be hazardous. To avoid personal
injury or equipment damage, disconnect the attached
p ower co rds, telec om mu nic ation sy ste m s, netw orks ,
and modems before you open the server covers, unless
instructed otherwise in the installation and configura-
tion pr oc ed ure s.
Observe the following rules when working on electrical
equipment.
Important: Use only approved tools and test equipment.
Some hand tools have handles covered with a
soft material that does not insulate you when
working with live electrical currents.
Many customers have, near their equipment,
rubber floor mats that contain small conductive
fib ers t o decre ase el ectr ost atic di scha rges . Do
not us e t h is ty pe o f ma t to p r ot ec t yo ur se lf f r om
electrica l shoc k.
• Find the room emergency power-off (EPO) switch, dis-
connecting s witch, or elect rical ou tlet. If an elect rical
ac cident occ urs, you can then operate th e switch or
unplug the power co rd quickly.
• Do not work alone under hazardous conditions or near
equipment that has hazardous voltages.
• Disconnect all power before:
— Performing a mechanical inspection
— Working near power supplies
— Removing or installing main units
• Before you start to work on the machine, unplug the
power cord. If you cannot unplug it, ask the customer
to power-off the wall box that supplies power to the
machine and to lock the wall box in the off position.
• If you need to work on a machine that has exposed
electrical circuits, observe the following precautions: