HP Color LaserJet CM2320 Service Manual - Page 120
ADF paper path and ADF sensors,
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ADF paper path and ADF sensors The following diagram shows the ADF paper path during a two-sided (duplexed) copy job. The paper enters the product from the ADF input tray and passes through the paper path for the first time (callout 1). The product then pulls the paper back through the path (callout 2) in order to reorient the page and scan the second side. The paper then travels back to the end of the paper path, where it is pulled in one more time to travel through the paper path (callout 3) in order for the product to reorient the page again before sending it out of the paper path and pulling in the next sheet. Figure 5-24 ADF paper path routes during duplex job Pick roller Paper present sensor ADF door open flag Separation pad Stack stop Pre-pick roller Picks top sheet 1 INPUT TRAY Cleanout Form sensor 2 PAGE EJECTS FULLY OUTPUT AREA 3 Prescan rollers ADF glass Postscan rollers The paper-present sensor determines if paper is in the ADF. The form sensor detects the top and bottom edges of the document. One other sensor detects an open ADF door. 108 Chapter 5 Theory of operation ENWW