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WorkCentre C2424 Service Manual
Document Feeder Functions
The WorkCentre C2424 Copier-Printer includes a Duplexing Automatic Document
Feeder (DADF). It is capable of automatically feeding original documents from the
input tray and scanning either a single-sided document or both sides of a double-sided
document.
Input Tray:
The input tray feeds document originals into the DADF for simplex
(single-sided) or duplex (double-sided) scanning. It has a capacity of 50 originals.
Output Tray:
Original documents fed through the DADF exit to the output tray.
Media Present Sensor/Media In Sensor:
The media in sensor detects the
presence of original documents in the input tray. After a delay to allow for adjusting
the feed guides, the media will stage to the this media staged sensor.
Media Staged Sensor:
This sensor, located within the DADF scanhead, detects
whether media has been fed into the DADF to a predetermined (staged) point. When
the scanner detects this point, it starts collecting data from the Charge Coupled
Device (CCD).
DADF Cover Open Sensor:
This optical sensor detects the status of the DADF
access cover. When the cover is open, DADF operation is inhibited; given sufficient
time, an error message appears on the control panel display instructing the user to
close the access cover.
Pick Roller and Separator Pad:
The pick roller is the first of several feed rollers.
It is designed to work with the separator pad to ensure that only one sheet of media is
fed at a time.
Feed Rollers and Idler Rollers:
Three additional feed rollers in the DADF are
responsible for media transport through the media path. They include associated idler
rollers to maintain proper media tension. This ensures proper imaging while
providing the minimal chance for damage to the original document(s).
Drive Motor:
A stepper motor is housed in the DADF to drive the pick and feed
rollers, and moves the calibration shutter into position. The connection is through a
toothed belt and gear drive. This connection and the vibration mounts that the motor
is mounted to help reduce vibrations introduced into the system.
DADF scanhead and Lamp:
The DADF utilizes a stationary scanhead containing
the imaging CCD. This scanhead is only for scanning the second side of a duplex
original. The lamp is a Cold Cathode Flourescent Lamp (CCFL).
Note
The CCFL is powered through a chopper board. It is supplied with a variable DC
input (Up to +24 VDC) and gen600 VDC to +900 VDC depending on the
supply voltage.
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