Hewlett-Packard 340LX soft resetRemove the cover of the backup battery located on the bottom of 340lx and press the RED RESET button for 5 sec. The palmtop will reboot. All unsaved data will be lost!
Hewlett-Packard 340LX hard resetRemoving the main battery is one of the steps in resetting all information on a device. Take out the main batteries for at least 3 minutes, then insert them and turn on your HP 340LX device.
Removing HP Palmtop 340LX main AA batteries
The two AA main batteries are stored under the battery plate on the bottom of the device, below the hinge for the cover. Slide the cover plate off and remove the two AA batteries. Reverse the process to reinstall the battery.
Removing HP Palmtop 340LX back up battery
The backup battery is found under the small square door on the bottom of the device. Open the door and use the stylus to remove the old battery. Reverse the process to reinstall the battery.
HP 340lx Backup battery
The HP 340LX system uses one Li CR2032 battery for backup purposes. This backup battery will be used to maintain the system when the main batteries are removed from the system or when the main batteries are weak. The typical capacity of the backup battery is 180 mAh. The backup battery comes into operation when there is no ACIN signal and the VLB signal is active low. The Very Low Battery (VLB) signal is set to be low when the main battery voltage drops below 1.4 V. This signal is reset when the main batteries' voltages rise above 1.8 V.
If the backup battery is low, the device may function abnormally. The abnormalities may be related to the display, calibration, settings, sound, or other features. For example, the image on the screen will blink on and off or mix colors on the screen and/or the stylus may frequently need to be calibrated. Often the abnormality will occur with more frequency as the battery loses more power. The backup battery should be replaced AT LEAST every 6 months: sooner if the device is operated often with a low main battery.