Lenovo ThinkPad T420 4236 User Manual page 216

• Before you install any of the following devices, touch a metal table or a grounded metal object. This action
reduces any static electricity from your body. The static electricity could damage the device.
– Memory module
– Mini-PCI Card
– ExpressCard
– CompactFlash
– Smart card
– Memory card, such as SD card, SDHC card, SDXC card, and MultiMediaCard.
Note: Not all listed devices are included in your computer.
This action reduces any static electricity from your body. The static electricity could damage the device.
• When transferring data to or from a flash media card, such as an SD card, do not put your computer
in sleep (standby) or hibernation mode before the data transfer is complete. To do so might cause
damage to your data.
Take care in setting passwords
• Remember your passwords. If you forget a supervisor or hard disk password, Lenovo will not reset it, and
you might have to replace your system board, or hard disk drive or solid state drive.
Care for the fingerprint reader
The following actions could damage the fingerprint reader or cause it not to work properly:
• Scratching the surface of the reader with a hard, pointed object.
• Scraping the surface of the reader with your fingernail or anything hard.
• Using or touching the reader with a dirty finger.
If you notice any of the following conditions, gently clean the surface of the reader with a dry, soft, lint-free
cloth:
• The surface of the reader is dirty or stained.
• The surface of the reader is wet.
• The reader often fails to enroll or authenticate your fingerprint.
Register your computer
• Register your ThinkPad products with Lenovo (go to http://www.lenovo.com/register). This can help
authorities return your computer to you if it is lost or stolen. Registering your computer also enables
Lenovo to notify you about possible technical information and upgrades.
Be sure not to modify your computer
• Only an authorized ThinkPad repair technician should disassemble and repair your computer.
• Do not modify or tape the latches to keep the display open or closed.
Tips on using the built-in modem
• Your computer modem may use only an analog telephone network, or public-switched telephone network
(PSTN). Do not connect the modem to a PBX (private branch exchange) or any other digital telephone
extension line because this could damage your modem. Analog phone lines are often used in homes,
while digital phone lines are often used in hotels or office buildings. If you are not sure which kind of
phone line you are using, contact your telephone company.
198
User Guide