My M477fdw Laser Jet Pro has started waking itself up a minute or two after going to sleep. It used to go into standby / sleep mode just fine.
It's connected to my wifi and hardwired to a desktop. I've rebooted the desk top, tried leaving it powered off and disconnecting the printer cable. none of those actions helped so I don't believe the desktop computer is involved. Is there a setting buried in the printer that causes this or something buried in a queue? I've checked all the queus I know of an there's nothing sitting there. I've changed the "go to sleep in X minutes" setting. No help. Rebooting the printer doesn't change anything.
Any idea what's making the thing wake up all the time?
May the printer connected to a phone line? for my experience, such behavior may occur due to a phone line condition.
If it is connected to a phone line, please unplug the phone cable and check if that may make any difference then.
If it makes a difference, try replacing the phone cable to another 2-wire phone cable, if this is a DSL line also make sure it is properly connected through an ADSL Micro-filter to its Phone port and try replacing the Micro-filter, if these make no difference please clarify what phone line type the printer is connected to, assuming it is.
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