HP LaserJet M9040/M9050 Service Manual - Page 164
Tray 1, Tray 1 driver PCA, Tray 1 power supply, Tray 1 sequence of operation
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Tray 1 Tray 1 accommodates a wide variety of media. It picks up and feeds media directly into the paper path. Tray 1 driver PCA Tray 1 includes a driver PCA with a four-bit microcomputer (CPU-IC2501) that controls the operational sequence and the serial communications with the DC controller. The CPU drives a motor, a solenoid, and a clutch according to commands from the DC controller. Figure 5-35 Tray 1 operations Tray 1 power supply The power supply provides +24 volts DC to the motor, the solenoid, and the clutch, and +3.3 volts DC for the IC and the sensors. Tray 1 sequence of operation If no media is detected by the paper path senor, the Tray 1 pickup roller is returned to its initial position whenever any of the following occurs: ● The door is closed ● The product returns from sleep mode ● Tray 1 is installed Tray 1 picks up media according to the following sequence: 1. Receives a pickup command 2. Turns on the pickup solenoid (SL2501) to places the pickup roller in contact with the media surface 3. Turns on the feed clutch (CL2501) to rotate the pickup roller and the feed roller to pick up the media. 146 Chapter 5 Theory of operation ENWW
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