HP laserjet m712 Guide De Dépannage

The HCI lifts up the tray to keep the surface of the paper at the pickup position whenever the following

occurs:

●

The product is turned on

●

The cassette is installed

●

The paper stack surface lowers by pickup operation

  HCI lift-up operation

M3303

PS3201

PS3202

Wire

Tray

Pulley

HCI left cassette lifter motor

HCI left cassette

media stack surface 2

sensor

HCI left cassette media stack surface 1 sensor

The figure above illustrates the mechanism for the left cassette, but each HCI cassette has the same

mechanism.

The operational sequence of the lift-up is as follows:

The HCI cassette lifter motor rotates the pulley to reel the wire. Accordingly the tray moves up.

The HCI cassette lifter motor stops when the HCI cassette media stack surface 2 sensor detects the

paper surface.

The HCI cassette lifter motor rotates again when the HCI cassette media stack surface 1 sensor

detects that the stack surface lowers during a print operation.

The HCI controller determines an HCI cassette lifter motor failure and notifies the formatter through the

DC controller when the HCI cassette media stack surface 2 sensor does not detect the paper surface

within a specified period from when the HCI cassette lifter motor starts rotating.

The HCI controller detects whether the paper is loaded in the cassette by monitoring the HCI cassette

media out sensor.

The cassette media-presence detection is not performed during Sleep mode.

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Chapter 1   Theory of operation

ENWW