Texas Instruments 4000M - Manual (Page 14)

Operating Guidelines
Usage
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Never pick up or carry your unit by the LCD.
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Never use the computer in harsh environments where it could be
subjected to rapid temperature changes and excessive dust.
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Never expose the computer to excessive vibration.
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Never expose the hard disk or floppies to strong magnetic fields, such
as those generated by audio system speakers or telephone handsets.
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Be sure the wall outlet supplies the voltage required by the AC
Adapter. Check the labels on the bottom of the computer case and on
the AC Adapter.
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Avoid leaving your computer in storage for more than two weeks
without a charged battery if the computer is not connected to the AC
Adapter. The battery that maintains the configuration, time, and date
will discharge.
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To avoid overheating the computer, never place anything on top of the
computer when it is recharging or operating.
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Before moving an active computer, press the Standby button to put the
computer into sleep mode and close the display (see Standby and
Suspend in the next section).
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Do not try to force the cover beyond its fully opened position-about
180 degrees.
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