Locating Frus And Crus - Lenovo ThinkPad P72 Hardware Maintenance Manual

• Blinks for three times: The computer is initially connected to power.
• On: The computer is on (in normal mode).
• Off: The computer is off or in hibernation mode.
• Blinks rapidly: The computer is entering sleep or hibernation mode.
• Blinks slowly: The computer is in sleep mode.
3 Numeric Lock indicator
When this indicator is on, you can use the numeric keypad to type numbers.
4 Fingerprint reader indicator
This indicator shows the status of fingerprint reader.
1 Off: The fingerprint reader is not ready for tapping.
2
Solid white: The fingerprint reader is ready for tapping.
3
Amber, blinking: The fingerprint cannot be authenticated.
5 Caps Lock indicator
When this indicator is on, you can type uppercase letters by directly pressing the letter keys.
6
Microphone-mute indicator
When this indicator is on, the microphones are muted.
7 Fn Lock indicator
This indicator shows the status of Fn Lock function. For more information, see Chapter 6 "Using the special
keys" on page 47.
8 Speaker-mute indicator
When this indicator is on, the speakers are muted.
9 Wireless-status indicator
When this indicator is on, you can connect the computer to a wireless network or wireless device.
10 Device-access-status indicator
When this indicator is blinking, the storage device of your computer is reading or writing data. During this
period, do not put the computer into sleep mode, remove the storage device, or turn off the computer.
11 ac power status indicator
This indicator shows the ac power and battery power status of the computer.
• White: connected to ac power (battery power 90%–100%)
• Amber: connected to ac power (battery power 0%–90%)
• Off: not connected to ac power

Locating FRUs and CRUs

This topic introduces the following service parts:
• "Major FRUs" on page 55
• "LCD FRUs" on page 57
• "Miscellaneous parts" on page 58
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Chapter 7 Locations