HP LaserJet 9040/9050 Service Manual - Page 111
Tray 4, Tray 4 driver PCA, Power supply, Sequence of operation
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Tray 4 Tray 4 is a 2,000-sheet feeder that picks up and feeds media into the printer. Tray 4 driver PCA A driver PCA in tray 4 holds a 16-bit microcomputer (IC1) that controls the tray 4 operational sequence and serial communications with the formatter. The driver PCA drives the motors and clutch according to commands that the formatter sends. Figure 34. Tray 4 block diagram Power supply Tray 4 employs a remote switch method for the power supply unit. The formatter sends a power-on signal to the power supply unit through the driver PCA. When the signal is received, the power supply unit supplies +24 Vdc and +5 Vdc to the driver PCA. +24V is then supplied to the lifter, feed, and pickup motors to drive them. The +5 V is supplied to the sensors and also to the ICs on the driver PCA. The power unit utilizes a standalone switch so that tray 4 can be powered on without turning on the printer. This switch is used for standalone diagnostics. See "Tray 4 diagnostics" in chapter 7. Sequence of operation When tray 4 is loaded with media and closed, the paper deck starts lifting the stack to the pickup position. When the formatter instructs tray 4 to deliver media, the drive rollers pick up a sheet and feed it to the registration assembly. The tray 4 registration assembly adjusts the skew and transports the sheet to the printer. Tray 4 95