Construction; Specifications/Controls/Functions - Canon iR3245 Series Service Manual

5.1 Construction

5.1.1 Specifications/controls/functions

iR3225 / iR3225N / iR3235 / iR3235N / iR3245 / iR3245N
The major specifications, controls and functions of the original exposure system are described below.
Item
Original exposure
Original scan
Read resolution
Gradation
Scanning speed (in ADF mode) 51 ipm (single sided, A4,LTR)
Carriage position detection
Magnification
Lens
CCD
CCD unit drive control
Original size detection
*1 Controls differ depending on magnifications. Refer to [Magnifications] for more information.
Description
Indirect exposure by LED (LED & photoconductive body)
In book mode: scan by movement of CCD
In ADF mode: stream reading with CCD fixed
600 dpi (main scanning) x 600dpi (sub scanning)
256 gradation, 8 bit
CCD unit HP sensor (SR1)
25% to 400% (in ADF mode: 25% to 200%)
Main scanning direction: image is processed on main controller PCB.
Sub scanning direction:
In book mode: speed change by carriage travel, image process on reader controller PCB, image process on main
controller PCB *1
In ADF mode: original feed speed change, image process on reader controller PCB, image process on main
controller PCB *1 original feed speed change, image process on reader controller PCB, image
process on main controller PCB *1
Gauss lens
Number of lines: 4 (R, G, B, B/W)
Number of pixels: 7500 x 3 color lines, 7500 x 1 B/W line
Maximum original read width: 304mm
By reader motor (M1)
[1] in book mode
Main scanning direction: by CCD
Sub scanning direction: by reflection sensor
[2] in ADF mode
Width: by original width volume/photo interrupter on ADF
Length: by photo interrupter on ADF
Chapter 5
0019-4628
5-1