Basic Sequence Of Operation In Response To A Press On The Start Key (Book) - Canon imageRUNNERC1022 Service Manual

5.2.3 Basic Sequence of Operation in Response to a Press on the Start Key (book)

Color imageRUNNER C1030 / Color imageRUNNER C1030iF
Reader motor
(M12)
Document lamp
(LAMP1,2)
Reader HP sensor
(SR717)
*1 Gain correction: The gain ratio of the analog video signal output from CCD is adjusted to be a fixed value.
*2 Move shading correction: Even when the document density is constant, the CCD output level does not become constant due to the following reasons.
- Variation in pixels for CCD
- Difference of the transmitted light intensity between the center and the surrounding of the lens
- Difference of the light intensity between the center and the surrounding of the document lamp
- Deterioration of the document lamp
Shading correction is performed to correct unevenness of the CCD output level.
1. Document lamp ON
(At lamp OFF only)
2. Gain -
offset correction
3. Move shading correction
4. Original scanning
* Book Position: the position at which the motor is accelerated to prepare for reading.
Move shading correction *2
HP shift
Book Position shift
Gain correction *1
Start key ON
STBY
HP Book Position
F-5-7
Home position
(Shading position)
Book Position *
F-5-8
Scan movement HP shift
SREADY
Read end position
: Motor forward
: Motor reverse
: Document lamp ON
: Reader HP sensor ON
Read start position
HP
Read end position
Chapter 5
0025-8938
5-5