HP Color LaserJet Enterprise CP4020 Service Manual - Page 95
Paper-feeder cassette lift operation,
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Paper-feeder cassette lift operation The paper feeder keeps the paper stack surface at the correct pickup position. The cassette lift operation occurs under the following conditions: ● The product is turned on. ● The cassette is inserted. ● The paper stack surface of the cassette lowers. The sequence occurs as follows: 1. The PD lifter motor rotates and the lifter moves up. 2. When the tray media-stack-surface sensor detects the stack surface of the paper, the PD lifter motor stops. 3. The PD lifter motor rotates again to lift the lifter when the PD cassette media-stack-surface sensor detects the stack surface, and then lowers during printing. If a tray media-stack-surface sensor does not detect a stack surface within a specified period after the PD lifter motor starts rotating, the paper feeder driver determines that the PD lifter motor has failed and through the DC controller notifies the formatter. Figure 1-50 Paper-feeder cassette lift PD cassette media stack surface sensor 1 SR1/SR5/SR12 PD cassette media stack surface sensor 2 SR2/SR8/SR9 PD cassette media presence sensor SR3/SR6/SR11 PD cassette media stack surface sensor lever Lifting plate PD cassette media presence sensor lever M1/M3/M4 M PD lifter motor Lifter The paper-feeder driver notifies the formatter if either of the paper-feeder media-stack surface sensors fails to detect the stack surface within a specified period from when a lift-up operation starts. ENWW Optional paper feeder 63