HP Pro 4300 C9H70UT C9H70UT#ABA manual Printing from the 500-sheet feeder

Printing from the 500-sheet feeder

Note The HP LaserJet 4200/4300 series printers support up to two optional 500-sheet feeders.

The paper-feeder driver controls the operation sequences of the 500-sheet feeder. An 8-bit microprocessor in the paper-feeder driver controls the 500-sheet feeder sequences and the communication with the DC controller PCA.

The paper-feeder driver drives the solenoid in response to the pickup command. The paper- feeder driver also returns the status of the paper feeder to the DC controller PCA.

The printer delivers a charge of +24 vdc to the paper feeder, which then generates +3.3 v for the integrated circuits.

Figure 22. 500-sheet feeder I/O block diagram

500-sheet feeder pickup and feeding

Three switches on the paper-feeder driver detect the media size and the presence of the 500- sheet tray. The relationship between the switch combinations and the paper sizes is the same as for the printer. See table 32 on page 83.

The main motor (M101) of the printer drives the paper feeder. When the DC controller PCA sends a print command to the paper feeder, the main motor of the printer begins to rotate. When the scanner motor reaches its prescribed speed, the paper-feeder driver receives the pickup command from the DC controller PCA and activates the paper-feeder pickup solenoid. (The main motor drives the pickup roller, feed roller, and separation roller.)

90 Theory of operation Q2431-90912