I haven't found a manual but the HP website says this:- HP LaserJet 4L Printer - Intelligent On/Off ISSUE: Intelligent On/Off replaces the power switch. SOLUTION: The HP LaserJet 4L printer goes into Intelligent Off mode after 15 minutes of non-use using only 5 watts of power per hour (180 watts on the average during printing). The printer powers on instantly when you: * send a job to the printer * touch the front button * open the printer's top door * insert paper into the printer If I find any references to online manuals, I'll let you know. Rik