Chapter 5
5-13
F-5-24
F-5-25
5.3.6 Dirt Sensor Control
5.3.6.1 Overview
0013-8592
/ / / / iR C3380i / iR C3380 / iR C2880i / iR C2880
When reading an original, the machine changes the point of reading or corrects image data in reference to the presence/absence of dust on the stream reading glass/
ADF platen roller, thereby avoiding the effects of dust on images. The machine executes this control only when the ADF is used and, in addition, when it is closed.
1. Timing of Control
(1) at the end of a job
(2) between sheets (each time a sheet is read)
(3) at the start of a job (only if any of the following is met)
(a) first job after power-on
(b) presence of dust at all points of detection at the end of the previous job
(c) failure of dust detection at the end of the previous job (e.g., the ADF is opened)
F-5-26
2. Particulars of Control
(1) At the End of a Job (dust detection)
The contact image sensor (CIS) checks the light reflected by the platen roller of the ADF at a point of reading to find out the presence/absence of dust. If the
presence of dust is detected, the contact image sensor moves to the next candidate point (2 times max.; A -> B -> C; B -> C -> A; or C -> A -> B).
The point identified will be used as the point of reading for the next job.
- For the control at the end of a job, the sensor will never move to point D.
- For the control at the end of a job, a message prompting cleaning of the glass surface will be indicated if an original is placed in the ADF while the presence of
dust has been detected at all points (A, B, C). The Start key is disabled until the message is cleared.
(2) At the Start of a Job (dust avoidance)
The same detection mechanism as used at the end of a job is executed; if the presence of dust is detected at all points (A, B, C), the sensor is moved to point D
for reading operation.
If the control is at the end of a job that takes place at point D, it will be after moving the sensor to point D.
CIS HP
Copyboard glass
AB-Configuration
A3
A4
B4
B5
A4R
A5
B5R
No original
Original
size
1
2
3
4
Original
sensor1
Inch-Configuration
11"X17"
LTR
LGL
LTR-R
STMT-R
No original
Original
size
1
2
3
Original
sensor2
: Change absent
: Change present
Main power
switch
ON
Dust detection control
Dust detection control
Dust detection control
STBY
WMUPR
Start key
ON
1st
SCAN
2nd
SCAN
Summary of Contents for iR C3380 series
Page 1: ...Aug 29 2006 Service Manual iR C3380 2880 Series...
Page 2: ......
Page 6: ......
Page 23: ...Chapter 1 Introduction...
Page 24: ......
Page 26: ......
Page 52: ......
Page 53: ...Chapter 2 Installation...
Page 54: ......
Page 127: ...Chapter 3 Basic Operation...
Page 128: ......
Page 130: ......
Page 136: ......
Page 137: ...Chapter 4 Main Controller...
Page 138: ......
Page 160: ......
Page 161: ...Chapter 5 Original Exposure System...
Page 162: ......
Page 188: ...Chapter 5 5 24 F 5 68 4 Remove the original sensor 2 hook 1 F 5 69...
Page 189: ...Chapter 6 Laser Exposure...
Page 190: ......
Page 192: ......
Page 206: ......
Page 207: ...Chapter 7 Image Formation...
Page 208: ......
Page 256: ......
Page 257: ...Chapter 8 Pickup Feeding System...
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Page 262: ......
Page 303: ...Chapter 9 Fixing System...
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Page 306: ......
Page 321: ...Chapter 10 Externals and Controls...
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Page 326: ......
Page 336: ...Chapter 10 10 10 F 10 10 2 Remove the check mark from SNMP Status Enabled...
Page 337: ...Chapter 10 10 11 F 10 11...
Page 359: ...Chapter 11 MEAP...
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Page 401: ...Chapter 12 RDS...
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Page 411: ...Chapter 13 Maintenance and Inspection...
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Page 416: ...Chapter 13 13 2 F 13 1 8 9 1 2 3 3 5 6 7 10 11 12 13 14 4...
Page 421: ...Chapter 14 Standards and Adjustments...
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Page 424: ......
Page 431: ...Chapter 15 Correcting Faulty Images...
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Page 434: ......
Page 459: ...Chapter 16 Self Diagnosis...
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Page 462: ......
Page 481: ...Chapter 17 Service Mode...
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Page 484: ......
Page 571: ...Chapter 18 Upgrading...
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Page 574: ......
Page 603: ...Chapter 19 Service Tools...
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Page 609: ...Aug 29 2006...
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