Service Hints & Tips
Do not place any objects between the display and keyboard or
under the keyboard.
Do not pick up or hold your computer by the display. When
picking up your open computer, hold it by the bottom (keyboard)
half.
Do not modify or tape the latches to keep the display open or
closed.
Do no turn your computer over while the AC Adapter is plugged
in. This could break the adapter plug.
Do not use or store your computer where the temperature is
below 5° C or above 35°C (41°F and 95°F).
Do not place your computer closer than 13 cm (5 in.) from any
electrical appliance that generates a strong magnetic field, such
as a motor, magnet, TV, refrigerator, or large audio speakers.
Do not hard-mount your computer in a vehicle or anywhere that it
is subject to strong vibration. See the section on ruggedized
mobile computers for information on a more appropriate model
for demanding applications.
Do not crush, drop, or physically punish the external or remov-
able hard disk, diskette, or CD-ROM drive when it is outside of
your computer.
Do not press on the middle part of the diskette drive.
Do not insert a diskette at an angle. Not inserting the diskette
straight into the drive can damage the drive.
Do not place more than one label on a diskette. Multiple or loose
labels can detach or tear and then lodge in the drive.
Do not touch the lens on the CD-ROM tray. You should hold the
compact disc by the edges and not touch its surface.
Do not connect a PBX (private branch exchange) or other digital
telephone extension line. Your computer can use only a
public-switched telephone network (PSTN). Use of a phone
line other than PSTN can damage your modem. If you are not
sure which kind of phone line you are using, contact your tele-
phone company. Many hotels or office buildings use digital tele-
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ThinkPad 390X User's Reference
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