HP Color LaserJet Professional CP5220 Service Manual - Page 74
Paper-feeder jam detection,
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The operational sequence of the cassette lift-up is as follows: 1. The PF lifter motor rotates to raise the lifter. 2. When the PF paper-stack surface sensor detects the surface of the paper stack, the PF lifter motor stops. 3. The lifter motor rotates again when the PF paper-stack surface detects that the paper surface is lowered during a print operation. The paper feeder controller PCA determines a PF lifter motor failure and notifies the formatter through the DC controller when the PF paper-stack surface sensor does not detect the stack surface within a specified period after the PF lifter motor starts rotating. Figure 1-49 Paper-feeder cassette lift operation SR3 PF cassette media presence sensor SR2 PF media stack surface sensor Lifting plate Lifter PF cassette media presence sensor flag PF lifter motor M2 PF media stack surface flag Paper-feeder jam detection The paper feeder uses the PF paper-feed sensor (SR1) to detect the presence of print-media and to check whether print-media is being fed correctly or has jammed. Figure 1-50 Paper-feeder jam detection SR1 Paper feeder 1 The paper feeder detects the following jams: PF pickup delay jam PF residual paper jam PF door open jam The PF paper-feed sensor does not detect the leading edge of paper within a specified period, including a retry, after the PF pickup solenoid is turned on. The PF paper-feed sensor detects a presence of paper when the printer is turned on, when the door is closed or when the automatic delivery is performed. A door open is detected during paper-feed operation. 62 Chapter 1 Theory of operation ENWW