Mechanism; Reading System; Scanner Drive - Ricoh MP C2504 Field Service Manual

7. Detailed Descriptions

Reading System

Two scan modes are available: book mode (platen mode) and ADF mode (sheet-through method).
In book mode (platen mode), the scanner scans the document from left to right.
When the ADF is used (ADF mode), the scanner is fixed in the home position on the left side, and the
document is transported and read (sheet-through method).
Scanner
Scanner lamp
The light source is an LED. The LED emits little heat (low power consumption), and has excellent
light output rise characteristics.
CCD
The 3 line color CCD converts shade in the document to 3 color (B, G, and R) electrical signals.
The use of a 4.7 µm image CCD achieves low-cost and compactness.
Reflection plate (reflector)
The reflection plate reflects light from the scanner lamp, and collects light for the document read
unit. The light which illuminates the document is adjusted to be the same on the left and right so as
not to cast any shadow on the document.
White reference seal
A white reference seal for shading correction is affixed to the underside of the scale on the left of
the MFP. This is read by the scanner and CCD when the power is ON. The data read are
temporarily stored in a RAM, and used for correction of document image data.

Mechanism

Scanner Drive

The scanner is driven by the scanner motor [D] via the timing belt [C]. For each mode, reading is
completed in one pass.
Position control of the scanner carriage [B] is based on the scanner HP sensor [A].
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