1 x 500-sheet and 3 x 500-sheet high-capacity input
feeder
The optional 1 x 500-sheet and 3 x 500-sheet high-capacity input (HCI) feeders are installed under the
device. The HCI controls paper pickup and feeding to the entrance of the device.
1 x 500-sheet HCI 3 x 500-sheet HCI
Figure 4-31 HCI paper path
The HCI driver PCA controls the HCIs. The PCA CPU controls the operational sequence and the serial
communication with the DC controller. The 1 x 500-sheet HCI has one PCA. The 3 x 500-sheet HCI has
three identical PCAs.
The DC controller sends commands to the PCA at specified intervals. The PCA drives each load (for
example, motors and solenoid). The PCA also returns status information to the DC controller.
The device supplies 24 Vdc to the HCI. The HCI driver PCA generates the 3.3 Vdc for component
devices such as sensors and ICs from the 24 Vdc.
The DC controller commands the HCI driver PCA at the specified time.
138 Chapter 4 Theory of operation ENWW
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