HP LaserJet 5000 Service Manual - Page 122

Printing from Tray 1 The presence of paper in Tray 1 is detected by the Tray 1 Paper Sensor (PS401). When the Formatter PCA sends the /PRNT (print signal) to the printer, the CPU turns the Tray 1 pickup solenoid (SL404) on within the specified period of time for the main motor (M1) and the scanner motor to start and the printer to be ready to print. This turns the cam on and lifts the middle plate where the paper is loaded. The paper touches the Tray 1 feed roller. The Tray 1 feed roller rotates a full circle to feed one sheet of paper. Extra sheets are removed with the separation pad, and only one sheet is fed into the printer as the Tray 1 feed roller rotates. The paper passes through the registration roller paper sensor (PS403) and stops at the registration roller that is not turning, loops the leading edge of the paper and corrects its skew. The CPU turns the registration roller clutch (CL405) on within a specified loopforming time and feeds the paper through the transfer unit, the separation unit, the fuser, and the delivery unit, and outputs it onto the tray. EN Paper Feed System 5-31