11:10 AM PT -- Speer just entered a not guilty plea to all charges. His lawyer, Shawn Holley, said during Friday's arraignment, he's been sober now for 29 days and is currently in a Utah rehab facility. Sources connected to Speer tell TMZ, he's never had such an incident occur before and is "distraught and devastated." Holley tells TMZ, "Scott is doing everything in his power to address the issues which led to this incident."

Scott Speer's been hit with 5 felony charges for an alleged domestic violence incident that culminated with him trying to set fire to his family's home.

The L.A. County District Attorney's Office charged the "Step Up Revolution" filmmaker with arson and domestic violence as expected, but tacked on 3 more felony counts -- one each for child abuse, criminal threats and resisting arrest.

The details of the alleged child abuse are unclear, but he's looking at some serious prison time if he's convicted on all counts. On the arson charge alone he faces up to 8 years.

We broke the story ... Speer was arrested at his San Fernando Valley home last month after he allegedly roughed up his wife in a drunken rage and tried to burn the house down by igniting a broom.

Fortunately, he was unsuccessful, but he still got hauled off to jail when cops and firefighters showed up.