Why does my hp printer make noise (reset? recallibrate?) when I'm not using my computer?

[Noreen b]

I'll be sitting on the couch and it will just start making noise, not sure what it's doing but it happens several times a day.

 

[Laid back]

Depending on printer type. The laser will periodically recharge the toner supply since it gets outdated from heat. A inkjet will perform maintenance to clean the heads. Suggest you turn the unit off if it will be more than a couple of hours before you plan to use it again.

 

[poppawick]

I would think it has an internal clock that resest it's self. I have a MCF 210C that resets it's self every night at midnight. It even changes it's self for the time changes in Spring and Fall.