IBM ThinkPad T21 Hardware Maintenance Manual page 51

Indicator
4 Scroll lock
5 Power on
6 Battery
7 Standby
status
8 Ultrabay
status
Meaning
Green:
Green:
Green:
Blinking green:
Orange:
Blinking orange:
Green:
Blinking green:
Green:
Blinking green:
Turn off:
Note: If you are using Windows 2000 or
Windows XP, the Ultrabay status indicator
does not blink while an Ultrabay 2000 device
is being detached. Instead, a message box
pops up when the process is completed; then
the indicator turns off.
ThinkPad T20, T21, T22 and T23 series
Scroll Lock mode is enabled. Arrow
keys can be used as screen-scroll
function keys, but not to move the
cursor. To enable or disable Scroll
Lock mode, press Fn + ScrLk key.
Not all application programs
support this function.
This indicator stays lighted
whenever the computer is on. If
the power-on indicator is on and
the standby indicator is off, the
system is ready to use. If both the
power-on indicator and the standby
indicator are on, you can use the
computer after it returns from the
standby mode and the standby
indicator goes off.
The battery is fully charged.
The battery has enough power to
operate, but is being charged.
The battery power is low. The
battery needs to be charged.
The battery needs to be charged
when the indicator starts blinking
orange, the computer beeps three
times.
The computer is in standby mode.
The computer is entering standby
mode or hibernation mode, or is
resuming normal operation. This
indicator does not blink in Windows
2000, Windows Me, and Windows
XP.
An Ultrabay 2000 device is
installed and in use.
An Ultrabay 2000 device is in the
process of being detached.
An Ultrabay 2000 device is ready
to be attached or detached.
Product overview
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