Chapter 5
5-13
F-5-25
5.3.5 Dirt Sensor Control
5.3.5.1 Dust Detection in Stream Reading Mode
0008-7512
The machine uses the dust detection control mechanism to check for dust on the platen glass and the ADF platen roller, thus preventing reproduction of
dust, if any, in output images.
Timing of Control
1. at the end of a job
2. between sheets (for every sheet)
F-5-26
*Executed only if dust has been detected at all points (A, B, C, D, E) during the previous job. In such a case, the machine will use the point subjected to
least dust, and executes correction before starting a read operation.
Particulars of Control
- At the End of a Job (changing the stream reading dust read position)
The machine measures the light reflected by the surface of the platen roller, and detects the presence/absence of dust with reference to its intensity. If
the presence of dust is detected, the machine moves to the next point (5 points max.; A -> B -> C -> D -> E).
The machine uses the first point at which the absence of dust is detected as the read point for the next job.
1
A B
2
A B
3
A B
4
A B
1
A B
2
A B
3
A B
Original
size
A3
B4
A4R
A4
B5
B5R
A5
B6
none
Original
sensor 1
CCD point
of detection
AB-Configuration
Original
size
11"x17"
LGL
LTRR
LTR
STMTR
STMT
absent
CCD point
of detection
Inch-configuration
change absent
:change present
Original
sensor 3
Dust detection control*
Dust detection
control
Dust detection control
Start key
ON
1st
SCAN
2nd
SCAN
Summary of Contents for iR5570 Series
Page 1: ...Mar 29 2005 Service Manual iR6570 5570 Series ...
Page 2: ......
Page 6: ......
Page 26: ...Contents ...
Page 27: ...Chapter 1 Introduction ...
Page 28: ......
Page 30: ......
Page 55: ...Chapter 2 Installation ...
Page 56: ......
Page 58: ...Contents 2 9 3 Mounting the Cassette Heater 2 34 ...
Page 98: ......
Page 99: ...Chapter 3 Basic Operation ...
Page 100: ......
Page 102: ......
Page 110: ......
Page 111: ...Chapter 4 Main Controller ...
Page 112: ......
Page 114: ......
Page 135: ...Chapter 5 Original Exposure System ...
Page 136: ......
Page 181: ...Chapter 6 Laser Exposure ...
Page 182: ......
Page 184: ......
Page 192: ......
Page 193: ...Chapter 7 Image Formation ...
Page 194: ......
Page 198: ......
Page 259: ...Chapter 8 Pickup Feeding System ...
Page 260: ......
Page 350: ......
Page 351: ...Chapter 9 Fixing System ...
Page 352: ......
Page 401: ...Chapter 10 External and Controls ...
Page 402: ......
Page 406: ......
Page 448: ......
Page 449: ...Chapter 11 MEAP ...
Page 450: ......
Page 452: ......
Page 455: ...Chapter 12 Maintenance and Inspection ...
Page 456: ......
Page 458: ......
Page 468: ......
Page 469: ...Chapter 13 Standards and Adjustments ...
Page 470: ......
Page 505: ...Chapter 14 Correcting Faulty Images ...
Page 506: ......
Page 508: ......
Page 537: ...Chapter 15 Self Diagnosis ...
Page 538: ......
Page 540: ......
Page 565: ...Chapter 16 Service Mode ...
Page 566: ......
Page 568: ......
Page 633: ...Chapter 17 Upgrading ...
Page 634: ......
Page 636: ......
Page 641: ...Chapter 17 17 5 F 17 4 HDD Boot ROM Flash ROM System Software ...
Page 646: ...Chapter 17 17 10 F 17 11 8 Click START F 17 12 ...
Page 675: ...Chapter 17 17 39 F 17 59 2 Select the data to download F 17 60 3 Click Start ...
Page 677: ...Chapter 18 Service Tools ...
Page 678: ......
Page 680: ......
Page 683: ...Mar 29 2005 ...
Page 684: ......