Scanning Operation; Process Of Detection Of Original Size; Scanning Of An Original Placed On The Original Glass; Scanning Of An Original Placed On The Radf - Toshiba e-STUDIO206L Service Manual

3.9.4

Description of Operation

[ 1 ] Scanning operation

Motor speed-reduction pulley
Motor pulley
•

Scanning of an original placed on the original glass

This motor drives the carriages-1 and -2 through the timing belt and carriage wire. First, the scan
motor drives the carriages-1 and -2 to their respective home positions. The home positions are
detected when the carriage-1 passes the carriage home position sensor (S7). When the [START]
button is pressed, the both carriages start to move and scan the original on the glass.
•

Scanning of an original placed on the RADF

It stops at the scanning position and starts scanning, and performs shading correction before
scanning and at constant intervals during scanning.
• Scanning speed
In case of the 4-line CCD, the carriage speed of the original in the color scanning mode is half of
that in the black and white scanning mode. In case of the 3-line CCD, it becomes the same
speed.
3.9.5

Process of detection of original size

[ 1 ] e-STUDIO206L/256/306/356/456/506
Reflection type photosensors are placed on the base frame of the scanner unit as shown in the figure
below. Each sensor consists of an infrared Light Emitting Diode (LED) on the light-emitting side and a
phototransistor on the light-receiving side.
When there is an original on the original glass, light beams from the LEDs are reflected by the original
and led to the phototransistors. This means that the presence/absence of an original is detected by
whether there is a reflection or not (when a black image is scanned).
e-STUDIO206L/256/306/356/456/506 / 207L/257/307/357/457/507
OUTLINE OF THE MACHINE
Wire pulley
Scan motor
Fig. 3-33
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Carriage-1
Carriage-2
Idler pulley