Adjust The Image Focus In Spf Back-Face Mode (Cis) - Sharp AR-M550N Service Manual

: Feb. 9 2004
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4) Make a normal copy on A4 paper.
5) Compare the copied image of the scale and the actual scale length
in terms of length.
100mm scale
10
(Original)
Copy image
(1mm (1%)
10
shorter than
the original)
If the copied image of the scale is of almost the same length as the
actual scale but is not satisfactorily focused, do the following steps.
6) Remove the table glass and dark box cover.
7) To prevent the CCD unit optical axis from being deviated, mark the
CCD unit base as illustrated below.
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8) Loosen two fixing screws of the CCD unit.
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Note: The screws cross-marked in the illustration must not be loos-
ened.
Loosening these screws could possibly change the CCD unit base
optical axis. Once the optical axis has been changed, it cannot be cor-
rected through on-site adjustments. Solving such a problem requires
the replacement of the entire scanner unit.
20 90 100 110
0.8mm
20 90 100 110
AR-M550/M620/M700 SETTING AND ADJUSTMENTS 7 - 15
9) Slide the CCD unit in the arrow direction (CCD sub-scanning direc-
tion) to change its mounted position.
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If the copied image is not satisfactorily focused and larger than the
original, slide the unit in direction B.
If the copied image is not satisfactorily focused and smaller than the
original, slide the unit in direction A.
Note: After adjusting the CCD unit position, fix the CCD unit so that it
is in parallel with the marker line added in step 7, referring to the
graduations on the front and rear frames sides of the CCD unit
base.
Repeat steps 4 to 9 until the copied image of the scale is of almost the
same size as the actual scale and the image is satisfactorily focused.
ADJ 5B Adjust the image focus in SPF back-face
mode (CIS)
This adjustment is needed in the following situations:
• The CIS unit has been removed.
• The CIS unit has been replaced.
• Copied/scanned/faxed images are not correctly focused.
• The SPF unit has been removed.
• The SPF unit has been replaced.
1) Make a duplex copy in SPF mode.
2) Make sure that the copied image on the back side of the paper is
satisfactorily focused.
If the image is not satisfactorily focused, do the following steps.
3) Remove the rear frame and front frame cabinet of the SPF unit.
4) Adjust the focus by turning the CIS focus adjusting screws on the
front and rear frame sides, respectively.
B
A