Canon iR105 Service Manual page 14

CONTENTS
CHAPTER 3 MAIN CONTROLLER
1 Basic Operation .................................. 3-1
1.1 Functional Construction ............ 3-1
1.2 Outline of the Electrical
Circuitry ..................................... 3-2
1.2.1 Outline ................................. 3-2
1.2.2 Main Controller PCB ........... 3-2
1.2.3 Hard Disk Drive ................... 3-2
1.3 Start-Up Sequence ..................... 3-4
1.3.1 Outline ................................. 3-4
1.3.2 Start-Up Sequence ............... 3-5
1.3.3 Construction of the System
Software ............................... 3-6
1.4 Inputs/Outputs the Major
PCBs .......................................... 3-7
1.4.1 Connection Diagram of
the Major PCBs ................... 3-7
2 Digital Image Processing .................... 3-8
2.1 Outline ....................................... 3-8
2.2 Input Image Processing .............. 3-9
2.2.1 Image Data from
the Reader Unit .................... 3-9
2.2.2 Enlargement/Reduction
(main scanning direction) .... 3-9
2.2.3 Edge Emphasis .................... 3-9
2.2.4 Edit Processing .................... 3-9
2.2.5 Density Conversion
(LUT) ................................... 3-9
2.2.6 Binary Processing
(error diffusion method
T-BIC) .................................. 3-9
2.2.7 Binary
(dither screen method) ....... 3-10
2.3 Controlling the Image
Memory .................................... 3-10
2.3.1 Compression/Expansion,
Rotation, and Enlargement/
Reduction ........................... 3-10
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3 Soft Counters .................................... 3-12
4 Controlling the Power Supply .......... 3-14
COPYRIGHT© 2001 CANON INC.
2.3.2 SDRAM ............................. 3-10
2.4 Output Image Processing ......... 3-11
2.4.1 Smoothing ......................... 3-11
2.4.2 Thickening
(PDL output only) ............. 3-11
2.4.3 Binary-Binary Conversion
(read image output only) ... 3-11
4.1 Outline ..................................... 3-14
4.2 Power Supply Mode ................ 3-14
4.3 Standby Mode
(normal operation) ................... 3-14
4.4 Power Save Mode .................... 3-14
4.5 Low Power Mode ..................... 3-15
4.5.1 Shift from Standby Mode
(standby → low power) ..... 3-15
4.5.2 Shift to Standby Mode
(low power → standby) ..... 3-15
4.6 Sleep Mode .............................. 3-15
4.6.1 Shift from Standby Mode
(standby → sleep) .............. 3-15
4.6.2 Shift from Low-Power
Mode (low power
→ sleep) ............................. 3-15
4.6.3 Return to Standby Mode
(sleep → standby) .............. 3-15
4.7 OFF Mode ................................ 3-16
4.7.1 Shift from Standby Mode
(standby → OFF mode) ..... 3-16
4.7.2 Shift from Low-Power
Mode (low-power
→ OFF mode) .................... 3-16
4.7.3 Return to Standby Mode
(OFF mode → standby) ..... 3-16
4.8 Power Supply OFF Mode ........ 3-16
2000 2000 2000 2000 CANON iR105 REV.0 JULY 2001