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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
sequence:
1
Receives a pickup command.
2
Turns on the pickup solenoid (SL2501), which brings the pickup roller in contact with the surface
of the media.
3
Turns on the feed clutch (CL2501) to rotate the pickup roller and feed roller, picking up the
media.
4
Feeds the media to the between-page adjustment position, turns off CL2501, and feeds media to
the printer.
5
Receives a feed-stop command, stops the motor, and returns to a standby state.
102 Chapter 5 Theory of operation
C8519-90912

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