Lenovo ThinkPad X20 ThinkPad X20, X21, X22, X23, X24 Hardware Maintenance Manu - Page 51

Fn key combinations, The following table shows the function of each combination

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Memory Fan 1. If two DIMMs are installed, remove one of them and run Diagnostics --> Memory Test - Quick. 2. If the problem does not recur, replace the DIMM, remove the other one, and run the test again. 3. If the test does not detect the error, run Diagnostics --> Memory Test - Full. 1. Turn on the computer and check the air turbulence at the louver near the power switch. 2. Run Diagnostics --> Other Devices --> IBM Fan. Fn key combinations The following table shows the function of each combination of Fn with a function key. The Fn key works independently from the operating system. Key Combination Result Fn + F1 Reserved. Fn + F2 Reserved. Fn + F3 Standby mode. Fn + F4 Suspend mode. Fn + F5 Reserved. Fn + F6 Reserved. Fn + F7 Switch between the LCD, the external monitor, and both the LCD and external monitor. Fn + F8 Reserved. Fn + F9 Reserved. Fn + F12 Hibernation mode. Fn + PgUp ThinkLight On/Off. Fn + Home The LCD becomes brighter. Fn + End The LCD becomes less bright. Chapter 3. ThinkPad X20, X21, X22, X23, X24 47

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Memory
1.
If two DIMMs are installed, remove one
of them and run
Diagnostics
-->
Memory Test - Quick
.
2.
If the problem does not recur, replace
the DIMM, remove the other one, and
run the test again.
3.
If the test does not detect the error, run
Diagnostics
-->
Memory Test - Full
.
Fan
1.
Turn on the computer and check the air
turbulence at the louver near the power
switch.
2.
Run
Diagnostics
-->
Other Devices
-->
IBM Fan.
Fn key combinations
The following table shows the function of each combination
of Fn with a function key.
The Fn key works independently from the operating
system.
Key Combination
Result
Fn + F1
Reserved.
Fn + F2
Reserved.
Fn + F3
Standby mode.
Fn + F4
Suspend mode.
Fn + F5
Reserved.
Fn + F6
Reserved.
Fn + F7
Switch between the LCD, the external
monitor, and both the LCD and external
monitor.
Fn + F8
Reserved.
Fn + F9
Reserved.
Fn + F12
Hibernation mode.
Fn + PgUp
ThinkLight On/Off.
Fn + Home
The LCD becomes brighter.
Fn + End
The LCD becomes less bright.
Chapter 3. ThinkPad X20, X21, X22, X23, X24
47