Dell Precision 3540 Service Manual page 16

Power button with fingerprint reader will have no LED and will leverage the available LED's in the system to provide indication of the system
status
• Power Adapter LED:
– The LED on Power adapter connector illuminates white when power is supplied from electrical outlet.
• Battery Indicator LED:
– If the computer is connected to an electrical outlet, the battery light operates as follows:
1 Solid white -the battery is charging. When the charge is complete the LED turns off.
– If the computer is running on a battery, the battery light operates as follows:
1 Off -the battery is adequately charged (or the computer is turned off).
2 Solid amber -the battery charge is critically low. A low battery state is approximately 30 minutes or less of battery life
remaining.
• Camera LED
– White LED activates when camera is on.
• Mic Mute LED:
– When activated (muted), the mic mute LED on the F4 Key should illuminate WHITE.
• RJ45 LEDs:
–
Table 2. LED on either side of RJ45 port
Link speed indicator (LHS)
Green
16 Technology and components
Activity indicator (RHS)
Amber