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HP LaserJet M4345 MFP - Scanner system; Electrical system

HP LaserJet M4345 MFP
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Scanner system
The scanner system adds copying and sending functions to the standard MFP printing function. The
scanner assembly consists of an automatic document feeder (ADF) and a flatbed scanner glass
surface.
Original documents that are fed through the ADF are delivered to the ADF output bin, which is
underneath the ADF input tray. Printed copies are delivered to the output device that is attached to
the print engine.
The scanner unit has built-in duplexing capability for scanning two-sided documents.
NOTE The MFP delivers two-sided printed copies of original documents only when a duplex
printing unit is installed in the print engine. If a duplex printing unit is not installed, the copies
are printed on one side of the page. If a duplex printing unit is installed, the printed copies can
be either one-sided or two-sided, depending on the instructions from the user.
Figure 4-64 ADF mechanical structure on page 198 shows a cross-section of the ADF.
Figure 4-64 ADF mechanical structure
Electrical system
The scanner assembly electrical system consists of the following components:
The charged-coupled device (CCD) PCA
The inverter PCA
The scanner PCA
The ADF PCA
The ADF LED PCA
The scanner assembly is connected to the print-engine formatter through a flat, flexible cable.
Figure 4-65 Scanner assembly electrical structure on page 199 shows the scanner assembly electrical
structure.
198 Chapter 4 Theory of operation ENWW
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