Operating Environment; Electrical Current Safety Information - Lenovo ThinkCentre M90p Safety And Warranty Manual

• Airflow temperatures into the computer should not exceed 35°C (95°F).
• Do not install air filtration devices. They may interfere with proper cooling.

Operating environment

The optimal environment in which to use your computer is 10°C-35°C (50°F-95°F)
with humidity ranging between 35% and 80%. If your computer is stored or
transported in temperatures less than 10°C (50°F), allow the cold computer to rise
slowly to an optimal operating temperature of 10°C-35°C (50°F-95°F) before use.
This process could take two hours in extreme conditions. Failure to allow your
computer to rise to an optimal operating temperature before use could result in
irreparable damage to your computer.
If possible, place your computer in a well-ventilated and dry area without direct
exposure to sunshine.
Keep electrical appliances such as an electric fan, radio, high-powered speakers,
air conditioner, and microwave oven away from your computer because the strong
magnetic fields generated by these appliances can damage the monitor and data
on the hard disk drive.
Do not place any beverages on top of or beside the computer or other attached
devices. If liquid is spilled on or in the computer or an attached device, a short
circuit or other damage might occur.
Do not eat or smoke over your keyboard. Particles that fall into your keyboard
can cause damage.

Electrical current safety information

DANGER
Electrical current from power, telephone, and communication cables is
hazardous.
To avoid a shock hazard:
• To prevent possible shock hazard, do not use your computer during a
lightning storm.
• Do not connect or disconnect any cables or perform installation,
maintenance, or reconfiguration of this product during an electrical storm.
• Connect all power cords to a properly wired and grounded electrical
outlet.
• Connect to properly wired outlets any equipment that will be attached
to this product.
• When possible, use one hand only to connect or disconnect signal cables.
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ThinkCentre Safety and Warranty Guide