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HP LaserJet 9000dn Service Manual: Optional Tray 1; Tray 1 Driver Pcb; Power Supply; Sequence Of Operation

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Optional tray 1

The optional tray 1 is a multipurpose tray that picks up and feeds media into the printer.

Tray 1 driver PCB

A driver PCB in the tray holds a four-bit microcomputer (CPU-IC2501) that controls its operational
sequence and serial communications with the DC controller PCB. The CPU drives a motor, solenoid,
and clutch according to commands sent from the DC controller PCB.
Figure 42.
Optional tray 1 block diagram

Power supply

The power supply is +24VDC supplied to drive the motor, solenoid, and clutch, and +3.3VDC for the
IC and sensors.

Sequence of operation

When the optional tray 1 is installed, the door is closed, or the printer returns from sleep mode, and
the paper path sensor (PS2502) does not detect the presence of media, the tray 1 driver PCB rotates
the motor to bring the pickup roller to its initial position. The tray proceeds with the following pickup
Receives a pickup command.
Turns on the pickup solenoid (SL2501), which brings the pickup roller in contact with the surface
of the media.
Turns on the feed clutch (CL2501) to rotate the pickup roller and feed roller, picking up the
Feeds the media to the between-page adjustment position, turns off CL2501, and feeds media to
the printer.
Receives a feed-stop command, stops the motor, and returns to a standby state.
102 Chapter 5 Theory of operation




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