NewFEIMAS
Refer to Revision Record on page 2.
T.Anzai
Nov. 20, 2008
K.Okada
Rev
04
03
PAGE
35
/
138
PFU LIMITED
P1PA03334-B30X/6
Refer to Revision Record on page 2.
T.Anzai
July 7, 2008
K.Okada
Refer to Revision Record on page 2.
K.Okada
K.Okada
DESCRIPTION
CHECK
DATE
T.Anzai
APPR.
K.Okada
K.Okada
Aug.19, 2005
DESIG
N
DESIG
.
CUST.
I.Fujioka
I.Fujioka
T.Anzai
CHECK
fi-5530C/fi-5530C2
IMAGE SCANNER
MAINTENANCE MANUAL
APPR.
TITLE
DRAW.
No.
Feb.23, 2007
05
Section 2-2
2-2 Reading station
(1) Optical system
Documents are set in the ADF paper chute (Chute unit) facing front side down. The front side of a document is read by the
Optical unit in the Base unit, and the backside of a document is read by the Optical unit in the Upper unit. These two
optical units have the same parts number.
An image on a document is projected to a color CCD through lens and mirror system, and the image is converted to signals
with 10 bit per pixel at 600 dpi resolution.
(2) Light source
The scanner uses two lamps (White cold cathode discharge lamps), which lights the scanning area where the optical unit
reads in order to get sufficient CCD output. The lamp is turned ON or OFF by Inverter that is controlled by the Control
PCA.
The life of lamp is about 10000 hours, which lasts through the life of device. So the lamp is not a consumable.
(3) Gain controller
Before scanning a document, the scanner reads white background of the reading position (front and back) and adjusts the
gain of CCD amplifier. If the CCD output does not reach a certain level after the gain adjustment, Optical alarm is issued.
When the gain adjustment finishes successfully, the scanner feeds the document to the reading position at pre-determined
speed for specified output resolution. Then the leading edge of the document is detected by the Sensor TOP before the
reading position. When the document is fed from Sensor TOP by some pre-defined length (for front and back side scanning
which is determined by sub-scanning offset correction value), the scanner starts reading image. The scanner terminates
reading operation when the document size specified from the host is scanned (Standard size scanning), or when the Sensor
TOP detects the trailing edge of a document (Page end detection scanning).
White
Stored in White level memory
255
0
Left edge
Right edge
Center
Pixel
Black
Initial output
Standard output
Low output
Optical alarm
