Sharp AR-BC260 Service Manual page 111

ADJ 7 Copy image focus (main
scanning direction copy
magnification ratio) adjustment
(CCD unit 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 copy image main scan-
ning direction is not proper.
• When the MFP main PWB is replaced.
• When the EEPROM of the MFP main PWB is replaced.
• When a U2 trouble occurs.
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
according to the following formula.
Main scanning direction copy magnification ratio
(Original dimension – Copy dimension)
=
Original dimension
(Example) Fit 10mm of the scale with 10mm of the copied scale
and compare them.
Main scanning direction copy magnification ration
100 – 99
= x 100 = 1
100
100mm scale
10 20
(Original)
Copy image
(1mm (1%)
10 20
shorter than
the original)
If the copy magnification ratio is not satisfactory, perform the
following procedure.
7) Remove the original guide L and R, and remove the table
glass.
8) Remove the dark box cover.
x 100 [%]
90 100 110
1.0mm
90 100 110
AR-BC260 SETTING AND ADJUSTMENTS 8 - 18
9) To prevent against the optical axis shift of the CCD unit, mark
the CCD unit base as shown in the figure below.
∗ This procedure must be performed when replacing the CCD
unit.
10) Loosen the two fixing screws of the CCD unit.
∗ Never loosen the screws marked with "✕ ✕ ✕ ✕ ."
If one of these screws is loosened, the CCD unit base posi-
tion and angle may be changed. If so, it cannot be adjusted
in the market, and therefore the whole scanner unit must be
replaced.
11) Slide the CCD unit in the arrow direction (CCD sub scanning
direction) to change the installing position.
When the copy image is longer than the original, move in the
direction of B.
When the copy image is shorter than the original, move in the
direction of A.
One scale of scribe line corresponds to 0.2%.
At that time, fix so that the CCD unit is in parallel with the scales
on the front frame side and on the rear frame side of the CCD unit
base.
∗ At that time, fix the CCD unit so that it is in parallel with the line
marked in procedure 9).
A
B