Lenovo ThinkPad 390X User's Reference for ThinkPad 390 - Page 50

Handling Your Computer Do not turn your computer over while the AC Adapter is plugged in. This could break the adapter plug. Do not use your computer when the temperature is below 5°C or above 35°C (41°F to 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, a magnet, a TV, a refrigerator, or large audio speakers. Do not hard-mount your computer in a vehicle or anywhere that it is subject to strong vibration. See "Ruggedized Mobile Computers" on page 37 for information on a more appropriate model for demanding applications. Do not crush, drop, or physically punish the external or removable hard disk, or bay device when it is outside your computer. Do not press on the middle part of the diskette drive or CD-ROM drive. Do not insert a diskette at an angel. Not inserting the diskette straight into the drive can damage the head. 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. Do not touch the surface of a compact disc; handle the compact disc only by its edges. Do not connect the modem to 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 telephone company. Many hotels or office buildings use digital telephone extension lines, so check before connecting the telephone cable in such places. Do not leave the base of your computer in contact with your lap or any part of your body for an extended period when the computer is functioning or when the battery is charging. Your computer dissipates some heat during normal operation. This heat is 34 ThinkPad 390 User's Reference