Sharp Mobilon HC-4000 Operation Manual page 60

The backup battery is low
message appears.
You cannot hear any sound.
Communication with your desktop
PC does not function properly.
Cannot access the inserted PC
Card.
Pressing the RESET button does
not reset the unit.
The unit does not operate even
though it is connected to an AC
power source.
The keyboard does not work
The unit cannot communicate with
a ZR Series unit or other handheld
PCs correctly.
Cannot recharge the battery pack
(HC-4500).
Charging cannot start (HC-4500).
Backlight disappears (HC-4500).
58
Replace the backup battery
(see page 24).
Use Volume & Sounds in Control Panel
applet to adjust the sound volume.
Make sure the serial cable is connected
to the serial ports securely (see page 30).
Make sure the serial port on your desktop
PC is the same one selected during the
Windows CE Services installation.
Make sure the card is inserted correctly
(see page 34) and is a recommended
card.
Remove the main and backup batteries,
and setup the unit again (see page 19).
WARNING: this procedure will cause the
loss of all data in the unit!
If the main batteries become depleted,
then the unit will not operate even when
connected to an AC power source.
Replace the main batteries with two new
ones and try again (see page 21).
Recharge the battery pack with the unit
turned off, and try again (see page 26)
Reset the unit (see page 29).
Make sure their infrared ports are facing
each other (see page 32).
Make sure the unit is turned off,
otherwise charging cannot start.
Charging will not start if the ambient
temperature is too low or too high. Be
sure to perform charging at a
temperature between 15 °C and 30 °C
(59 °F - 86 °F).
You cannot charge the battery pack while
the Notification indicator is blinking in
amber.
Is the unit near a magnet or object with
strong magnetic field? Backlight may
disappear due to magnetic field effect.