Canon imageRUNNER ADVANCE 4551i Service Manual page 765

■ IMG-RDR
COPIER > OPTION > IMG-RDR
DFDST-L1 1
Detail
Use Case
Adj/Set/Operate Method
Caution
Display/Adj/Set Range
Default Value
Related Service Mode
Supplement/Memo
DFDST-L2 1
Detail
Use Case
Adj/Set/Operate Method
Caution
Display/Adj/Set Range
Default Value
Related Service Mode
Supplement/Memo
Adj img crrct level: stream read, front
To set whether to perform image correction between originals in the Scanner Unit (for front side)
at stream reading based on the result of dust detection.
- In the case of DADF (reverse model)
Increase the value when black lines appear. As the value is larger, the image is more likely to be
corrected because the machine is more likely to respond to small dust.
Decrease the value if a fine image portion is unclear as a result of dust detection correction control.
As the value is smaller, the image is less likely to be corrected because the machine is less likely
to respond to dust.
- In the case of DADF (1-path model)
Set one of 1 to 255 when black lines appear. Dust detection is performed and image is corrected
as needed.
Set 0 if a fine image portion is unclear as a result of dust detection correction control. In that case,
dust detection is not performed.
- When black line occurs due to dust
- Upon user's request
1) Enter the setting value, and then press OK key.
2) Turn OFF/ON the main power switch.
In the case of DADF (reverse model), a fine image portion may be unclear if the value is too large.
If the value is too small, black lines may appear on the image.
0 to 255
0: OFF
1 to 255: ON (DADF (1-path model) only)
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COPIER> OPTION> IMG-RDR> DFDST-L2
Black lines may appear on the image if there is dust. With dust detection correction control, the
image is corrected to prevent black lines once dust is detected.
Adj dust dtct level: stream read, front
- In the case of DADF (reverse model)
To adjust dust detection level for dust avoidance control that is executed in the Scanner Unit (for
front side) after a stream reading job is completed.
- In the case of DADF (1-path model)
To adjust dust detection level for dust avoidance control that is executed in the Scanner Unit (for
front side) at start of the first stream reading after power-on.
Decrease the value in the case of frequent display of cleaning instruction at the time of dust
detection. As the value is smaller, dust is less likely to be detected. When 0 is set, the cleaning
instruction is not displayed.
Increase the value when black lines appear. As the value is larger, the small dust is more likely to
be detected.
- When black line appears due to dust
- Upon user's request
1) Enter the setting value, and then press OK key.
2) Turn OFF/ON the main power switch.
If the value is too large, the cleaning instruction screen may appear too often since even small dust
that will not appear on the image can be detected.
If the value is too small, black lines may appear on the image.
0 to 255
0: OFF
200
COPIER> OPTION> IMG-RDR> DFDST-L1
With the dust avoidance control, reading position is adjusted to minimize dust to be least detected.
The control is performed at start of the first job after power-on in the case of DADF (1-path model);
whereas it is performed every time a job is completed in the case of DADF (reverse model).
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8. Service Mode