HP M3027 Service Manual - Page 69
ADF/scanner system, ADF, Sensors in the ADF, ADF paper path,
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ADF/scanner system ADF If the ADF fails, it can be replaced as a whole-unit replacement part. Sensors in the ADF The ADF contains the following sensors: ● ADF-cover sensor. Detects whether the ADF cover is open or closed. ● Top-of-page sensor. Detects the top of the page before sending a page through the ADF and the end of the page after feeding/scanning is complete. ● Paper-present sensor. Detects whether a document is present in the ADF. If paper is present in the ADF when copies are made, the device scans the document using the ADF. If no paper is present when copies are made, the device scans the document using the scanner glass. ADF paper path The ADF feeds documents past the ADF glass for scanning. Figure 4-2 ADF path for single-sided documents on page 57 shows the path for single-sided documents. 34 5 1 2 6 8 7 Figure 4-2 ADF path for single-sided documents 1 Separation pad 5 2 Pickup roller 6 3 Stack stop 7 4 Pre-pick roller 8 ADF input tray Delivery/duplex-feed rollers ADF glass ADF feed rollers ENWW Basic operation 57