HP Pro 4300 C9H70UT C9H70UT#ABA Sheet feeder lifting mechanism, sheet feeder lifting mechanism

1,500-sheet feeder lifting mechanism

The lifting mechanism maintains the media stack surface at a specific position inside the 1,500- sheet feeder. This allows the feeder to perform a stabilized pickup operation regardless of the size of the media loaded in the feeder. The lift plate inside of the feeder is lifted by two wire cables. A motor (M1) winds these wires up using pulleys in the feeder. When the front door of the feeder is opened, the pulley gears and the motor gear are disengaged and the lift plate lowers under its own weight. The lifting mechanism is active (the plate is in the raised position) when it is signaled by the DC controller PCA, the front door is closed, or during the print operation. The 1,500-sheet feeder control PCA driver stops the motor (M1) when the 1,500-sheet feeder paper stack position sensor (SR2) detects media.

If the 1,500-sheet feeder paper stack position sensor (SR2) does not detect media within about 30 seconds after the start of the lift operation, the paper-deck driver PCA detects a lifter motor failure and sends a signal to the DC controller PCA. An error message appears on the control- panel display.

Figure 26. 1,500-sheet feeder lifting mechanism

94 Theory of operation Q2431-90912