On HP Futuresmart printers, the card reader beeps every 15 to 20 minutes and at the same time the printer wakes up from sleep mode and warms up by performing a noisy page feeder and print engine mechanical test. It then waits for few minutes and goes back to sleep as there is no print job.
The following symptoms might be seen:
USB badge reader not working, USB errors, and other performance issues occur after the printer wakes from sleep mode when the Auto Off after sleep setting is enabled on an HP LaserJet Enterprise or HP PageWide Enterprise printer that has a USB badge reader accessory installed.
This is due to the energy saving setting in the HP printer configuration, Auto Off after sleep. This setting must be disabled when there is any USB device connected to the printer, otherwise it wakes the printer from sleep mode after few minutes.
To disable the setting: