2 - F - 6
WRITE UNIT
[5] Image Write Control
RESET
MEE V/V
M V/V
M CLK CHG
DCORR
I YOBI 1
RXA 0
RXA 1
MTN V/V
MAPC CAL
MIND CHG
CORR
425-A2
425-A3
425-A4
425-A5
425-A6
425-A7
425-A8
425-A9
425-A10
425-B1
425-B2
425-B3
425-B4
425-B6
425-B7
425-B8
425-B9
425-B10
442-3
442-5
442-7
442-9
481-A2
481-A3
481-A4
481-A5
481-A6
481-A7
481-A8
481-A9
481-A10
481-B1
481-B2
481-B3
481-B4
481-B6
481-B7
481-B8
481-B9
481-B10
423-3
423-5
423-7
423-9
423-11
423-12
428-B1
428-B50
428-A1
428-A50
IP REQ
INDEX
TXA 1
IPB
TXA 0
O YOBI 1
M INDEX 1
M INDEX 2
S INDEX 1
S INDEX 2
HLVL
IPR
M40 PWR A
M40 PWR B
M40 DRIVE A
M40 DRIVE A'
M40 DRIVE B
M40 DRIVE B'
LD1 APC CONT 1
LD1 APC CONT 2
LD1 VIDEO
LD1 ALM
LD1 IRCLK
LD1 INC
LD1 U/D
LD1 C/S
LD1 LPR
LD2 APC CONT 1
LD2 APC CONT 2
LD2 VIDEO
LD2 ALM
LD2 IRCLK
LD2 INC
LD2 U/D
LD2 C/S
LD2 LPR
424-1
424-2
424-3
424-4
424-5
424-6
421-3
421-4
421-5
421-7
421-8
421-9
421-10
421-11
421-12
422-3
422-4
422-5
422-7
422-8
422-9
422-10
422-11
422-12
420-40
420-1
IPB
M40
CB
440-3
440-4
440-5
440-7
440-8
440-9
440-10
440-11
440-12
LDB1
441-3
441-4
441-5
441-7
441-8
441-9
441-10
441-11
441-12
LDB2
411-1
411-40
ADB
INDEXSB
E-RDH
RDH IFB
450-A1
450-A50
450-B1
450-B50
The analog image data from the CCD sensor is A/D-converted
by the ADB (A/D converter board), then sent to the IPB (image
processing board) where it is data-processed. The processed
image data is converted into laser beam and applied to the
drum with the control signals from the CB. There are two
lasers which are used to write two lines of image data in a
single scan. The write start position of each laser is detected
by the INDXSB (index sensor board). The E-RDH (electronic
RDH) can store digitized image data. Various editing func-
tions can be carried out based on this data.
1. Operation
a. Image processing
The following processing is done by the IPB (image process-
ing board).
(1) Shading correction
<Implementation timing>
a) White correction
* When the machine is switched ON
* Every 1000 copies
b) Black correction
* When the Copy button is pressed
(2) Brightness/density conversion
(3) AES processing
(4) Text/dot pattern judgement
(5) Filtering
(6) Magnification change processing
(7) Copy γ correction
(8) Write density control
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