Read Sharp AR-C270 (serv.man10) Service Manual online
5) Change the height balance of the front frame side scanner rail.
Perform procedures 2) – 5) until there is no difference between
the left distortion and the right distortion.
the left distortion and the right distortion.
6) When there is no difference between the left distortion and the
right distortion, change the height of the scanner rail on the front
frame side.
frame side.
7) Set the test chart made in procedure 1) on the document table,
and make a copy on A3 (11
×
17") paper. Check that the main
scanning distortion is within the specified range.
Repeat procedures 6) – 7) until the main scanning direction distor-
tion is within the specified range.
Repeat procedures 6) – 7) until the main scanning direction distor-
tion is within the specified range.
ADJ M12
Image focus (main scanning direction
copy magnification ratio) adjustment
(CCD position adjustment)
copy magnification ratio) adjustment
(CCD position adjustment)
This adjustment must be performed in the following cases:
•
When the CCD unit is removed from the machine.
•
When the CCD unit is replaced.
•
When the copy image focus is improper.
•
When the copy magnification ratio in the main scanning direction is
improper.
improper.
1) Enter the SIM 48-1 mode.
2) Set the set item B to 50 (initial value).
3) As shown in the figure below, place a scale on the original table.
4) Make a normal copy on A4 paper.
5) Compare the scale image length and the actual scale length.
6) Obtain the main scanning direction copy magnification ratio ac-
cording to the following formula.
Main scanning direction copy magnification ratio
=
(
Original length – Copy length
)
Original length
×
100 [%]
(Example) Fit 10mm of the scale with 10mm of the copied scale and
compare them.
Main scanning direction copy magnification ration
Main scanning direction copy magnification ration
=
100 – 99
100
×
100 = 1
7) Remove the original guide L and R, and remove the table glass.
8) Remove the dark box cover.
9) Remove the slide pin of the front cover unit.
10) Loosen the CCD unit fixing screws.
∗
Never loosen the screws which are not indicated in the figure
above. If loosened, the CCD unit must be replaced.
above. If loosened, the CCD unit must be replaced.
10
20
30
40
50
60
70
80
90
50
100110
120130140
10
20
90
100
110
10
20
90
100
110
1.0mm
100mm scale
(Original)
(Original)
Copy image
(1mm (1%)
shorter than the
original)
(1mm (1%)
shorter than the
original)
7 – 20
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