Hardware reference guide

7535 Hardware Reference Guide 11
Chapter 2: The Hardware
The Keyboard Backlight
2.5.1 The Keyboard Backlight
The 7535 has a backlight behind its keyboard. This backlight can only be turned off
and on, not adjusted for brightness, but it can be configured to turn on when the
ambient light level drops below a configured value.
2.6 The LEDs
The 7535 has four tri-coloured indicator LEDs.
Figure 2.2 Indicator LEDs
2.6.1 Charge LED
The lower-right LED is reserved for internal charger/power status. This indicator is
active even when the 7535 is inserted in a docking station (and in suspend mode) so
that the charge status of the battery can be detected easily.
Table 2.1 Charge LEDs
Function Charge LED Behaviour
External power not available. LED off.
Fully charged to within 95% of charge
capacity.
LED displays solid green colour.
Quick charge successfully completed to
within 75% of charge capacity.
LED flashes slow green.
Charge in progress. LED displays solid yellow colour.
Cell temperature out of range for charge. LED flashes yellow.
Unable to charge battery. LED displays solid red colour.
Charge circuit failure. LED flashes fast red.
Charge LED
User Application
Scan LED
Radio LED
LED