Original Exposure System; Construction; Specifications/Controls/Functions; Major Components - Canon imageRUNNER 2545 Series Service Manual

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Technology > Original Exposure System > Construction > Major Components

Original Exposure System

Construction

■ Specifications/controls/functions

The major specifications, controls and functions of the original exposure system are described
below.
Item
Original exposure Indirect exposure by LED (LED & photoconductive body)
Original scan In book mode Scan by movement of CCD
In ADF mode Stream reading with CCD fixed
Read resolution B/W: 600 dpi (main scanning) x 600 dpi (sub scanning)
(Color SEND): 300 dpi (sub scanning)
Gradation 256 gradation
Carriage position detection CCD HP sensor (S22)
Magnification 25% to 400%
Main scanning Image is processed on main controller PCB
direction
Sub scanning In book mode: speed change by carriage travel, image process on
main controller PCB *1
direction
In ADF mode: original feed speed change, image process on main
controller PCB *1
Lens Gauss lens
CCD 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
CCD unit drive control By scanner motor (M21)
Original size In book mode Main scanning direction: by CCD
detection
Sub scanning direction: by reflection sensor (AB/INCH)
In ADF mode Main scanning direction: by photo interrupter on DADF
Sub scanning direction: by photo interrupter on DADF
*1 Controls differ depending on magnifications. Refer to [Magnifications] for more information.
2 Technology > Original Exposure System > Construction > Major Components
Specification/function
T-2-1

■ Major Components

Following shows major components of document exposure system.
PCB2
S26
S21
S22
H5
Item Notation
Scanner motor M21 Pulse motor: controls the carriage drive
CCD HP sensor S22 Detects CCD home position
Copyboard Cover Open/Closed S21 Ends original size identification with the copy board
Sensor (front) cover at 5 deg
Copyboard Cover Open/Closed S26 Detects the copyboard cover open/close. Starts original
Sensor (rear) size identification with the copy board cover at 30 deg.
Original Size Sensor 0 S24 Helps identify original size(AB, INCH/AB/K, A)
Original Size Sensor 0 S29 Helps identify original size(INCH/A)
Original Size Sensor 1 S25/28 Helps identify original size(AB, INCH/AB/K, INCH/A, A)
CCD unit - Indirect exposure by LED (LED & photoconductive
body)
Reader Heater (Option) H5 Prevents condensation on the copyboard glass

Reader relay PCB

PCB2 Controls the reader unit drive and image process
2-3
M21
H5
S28
S25
S24/29
CCD unit
F-2-4
Specification/function
T-2-2
2-3