HP LaserJet 9040/9050 Service Manual - Page 109
Tray 1, Tray 1 driver PCA, Power supply, Sequence of operation
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Tray 1 Tray 1 is a multipurpose tray that picks up and feeds media into the printer. Tray 1 driver PCA A driver PCA in the tray holds a four-bit microcomputer (CPU-IC2501) that controls its operational sequence and serial communications with the DC controller PCA. The CPU drives a motor, solenoid, and clutch according to commands sent from the DC controller PCA. Figure 33. Tray 1 block diagram Power supply The power supply is +24 Vdc that is supplied to drive the motor, solenoid, and clutch, and +3.3 Vdc for the IC and sensors. Sequence of operation When 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 PCA 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 Tray 1 93