Scanning/image capture system system
Optical assembly
The scanner is a carriage-type platen scanner which includes the frame, glass, LED optics, and a
scanner controller board (SCB) attached to the bottom of the assembly. The scanner has a sensor to
detect legal-sized media and a switch to indicate when the ADF is opened.
The ADF and control-panel assembly are attached to the scanner assembly. If the scanner fails, it can
be replaced as a whole unit. The scanner replacement part does not include the ADF, SCB, or control-
panel assembly.
The HP Color LaserJet CM3530 contains an interconnect board (ICB) which has an NVRAM component
that is used to store critical engines values and formatter data. This NVRAM allows for simpler save/
restore process. When a formatter or DC controller is replaced, the critical engine values are copied
from NVRAM on the ICB to the new component.
Automatic document feed system
If the ADF fails, it can be replaced as a whole-unit replacement part.
Control panel
The control panel is a USB connected device with its own diagnostic capabilities. Calibration of the
control-panel touch screen does not require a special boot-key sequence. See .
The control panel also includes a hardware integration pocket where third-party USB solutions, such as
card readers, can be installed.
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 product scans the document using the ADF. If no paper is
present when copies are made, the product scans the document using the scanner glass.
174 Chapter 5 Theory of operation ENWW
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