Sharp AR-285 (serv.man11) Service Manual ▷ View online
1) Set A3 white paper on the original table as shown below.
2) With the original cover open, make a normal (X 1.0) copy.
3) Measure the black distance at the lead edge and the rear edge of
the copy paper.
If La = Lb, the procedures 4) through 7) are not required.
4) Loosen the fixing screw of the front or the rear frame mirror base
drive pulley.
•
If La < Lb, turn the rear frame mirror base drive pulley in
direction B. (Do not move the mirror base drive pulley shaft.)
direction B. (Do not move the mirror base drive pulley shaft.)
•
If La > Lb, turn the rear frame mirror base drive pulley in
direction A. (Do not move the mirror base drive pulley shaft.)
direction A. (Do not move the mirror base drive pulley shaft.)
5) Tighten the fixing screw of the mirror base drive pulley.
6) Perform procedures 1) through 3).
7) If La is not equal to Lb, perform procedures 4) and 5).
If La = Lb, the adjustment is completed.
Repeat procedures 1) through 6) until La = Lb.
Repeat procedures 1) through 6) until La = Lb.
(4) Main scanning direction distortion adjustment (Lower
rail height adjustment)
When there is no distortion in the direction of mirror base scanning
and there is sub scanning direction distortion, it can be adjusted by
changing the No. 2/3 mirror base unit rail height.
and there is sub scanning direction distortion, it can be adjusted by
changing the No. 2/3 mirror base unit rail height.
•
Before this adjustment, perform the horizontal image distortion ad-
justment in the laser scanner section.
justment in the laser scanner section.
This adjustment must be performed in the following cases:
•
When the mirror base wire is replaced.
•
When the copy lamp unit and no. 2/3 mirror unit are replaced.
•
When the mirror unit rail is replaced and moved.
•
When a copy shown below is made.
1) Make an original for the adjustment.
Draw parallel lines at 10mm from both sides of an A3 white paper.
2) Make a copy of the adjustment original on an A3 white paper at
the normal magnification ratio.
(Fit the paper edge and the glass holding plate edge.)
3) Measure the distances between the lines and the corners (4 posi-
tions of La, Lb, Lc, Ld).
When La = Lb = Lc = Ld, there is no need for adjustment.
Allow a little space.
Glass holding plate
Fit the paper edge and
the glass holding plate edge.
the glass holding plate edge.
A3 white paper
Paper exit direction
La: Lead edge black background section
Lb: Rear edge black background section
Lb: Rear edge black background section
A
Front side
Rear side
B
Original
Copy
10mm
10mm
10mm
10mm
Parallel line
White paper
Parallel line
La
Lb
Ld
Lc
Paper exit
direction
direction
7 – 9
4) Move the mirror base B rail position up and down (in the arrow
direction) to adjust.
•
When La > Lb, move the mirror base B rail on the paper
exit side upward by the half of the difference of La – Lb.
exit side upward by the half of the difference of La – Lb.
•
When La < Lb, move the mirror base B rail on the paper
exit side downward by the half of the difference of Lb - La.
exit side downward by the half of the difference of Lb - La.
Example: When La = 12mm and Lb = 9mm, move the
mirror base B rail on the paper exit side 1.5mm
upward.
upward.
•
When Lc > Ld, move the mirror base B on the paper feed
side downward.
side downward.
•
When Lc < Ld, move the mirror base B on the paper feed
side upward.
side upward.
When moving the mirror base rail, hold the mirror base rail
handle.
handle.
5) Adjust so that La = Lb and Lc = Ld.
6) After completion of the adjustment, manually turn the mirror base
drive pulley to make full scanning of mirror base A and mirror
base B and check that they do not make contact.
base B and check that they do not make contact.
If the mirror base rail is moved extremely, the mirror base may
be brought into contact. Be careful of that.
be brought into contact. Be careful of that.
(5) Main scanning direction magnification ratio
adjustment (CCD unit installing position adjustment)
1) Execute SIM 48-1.
2) Set each value to 50 (initial value).
3) As shown in the figure below, put 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) Put the scale so that 50mm of the scale is at the
center of the original.
Main scanning direction copy magnification ratio
=
100 – 98
100
×
100 = 2
7) Remove the original guide L and R, and remove the table glass.
8) Remove the dark box cover.
10
20
30
40
50
60
70
80
90
50
100
110
120130
140
A4
10
20
90
100
110
1mm
10
20
90
100
110
100mm scale
(Original)
(Original)
Copy image
(2mm (2%)
shorter than the
original)
(2mm (2%)
shorter than the
original)
1mm
7 – 10
9) Remove the slide pin of the front cover unit.
10) Insert the slid pin as shown below and make positioning in the
vertical direction.
11) Insert the slide pin as shown below and make positioning in the
horizontal direction.
(Initial position positioning is completed.)
Never loosen the screws which are not indicated in the figure.
If loosened, the adjustment cannot be made and the unit must be
replaced.
If loosened, the adjustment cannot be made and the unit must be
replaced.
12) Make a sample copy in the initial position and measure the
magnification ration again.
13) Change the installing position in the horizontal direction to adjust
the magnification ratio.
•
When the copy image is longer than the original, move in
the direction of B.
the direction of B.
•
When the copy image is shorter than the original, move in
the direction of A.
the direction of A.
•
One scale of scribe line corresponds to 0.2%.
•
For fine errors which cannot be adjusted with this
adjustment, use the next simulation SIM 48-1.
adjustment, use the next simulation SIM 48-1.
Never loosen a screw other than these ones.
A
B
7 – 11
(6) Main/sub scanning direction magnification ratio
adjustment
1) Before this adjustment, perform the previous adjustment of CCD
unit installation position.
2) Place a scale on the original table as shown. (Scale a and scale b
may be placed together or individually.)
•
After warming up, the ready lamp lights up.
•
The current set value is displayed simultaneously. (0
∼
20)
3) Make a normal copy and obtain the main/sub scanning direction
magnification ratios.
Copy magnification ratio (MRCP)
=
(
Original dimension – Copy dimension
)
Original dimension
×
100%
4) Execute SIM 48-1.
5) Change value A so that the magnification ratio in the sub scanning
direction is within the specified range.
6) Change value B so that the magnification ratio in the main scan-
ning direction is within the specified range.
•
Adjustment specification: Within
±
0.8%
•
When the copy dimension is smaller than the original
↓
Make the value greater.
•
When the copy dimension is greater than the original
↓
Make the value smaller.
When the value is changed by one step, the ratio is changed by
about 0.1%.
about 0.1%.
[AR-280 only]
7) Make a copy of A3 original with SPF, and measure the magnifica-
tion ratio in the sub scanning direction.
8) Change value C so that the magnification ratio in the sub scan-
ning direction is within the specified range.
9) Press the CA key to cancel the simulation.
(7) Image loss and void area adjustment
Before performing this adjustment, check that SIM 50-5 is set to 50. If
it is not, set SIM 50-5 to 50.
it is not, set SIM 50-5 to 50.
1) Place a scale on the document table and make a copy at 100%.
In this case, the following conditions must be satisfied.
The lead edge of the scale must be completely copied.
The paper transport direction must be in parallel with the
scale image direction.
scale image direction.
10
20
30
40
50
60
70
80
90
50
10
0
0
110
120
130
140
10
20
30 40 50 60 70
80 90
50 100 110 120 130 140
Scale a
Scale b
10
20
90
100
110
10
20
90
100
110
10
20
90
100
110
Scale
(Original)
(Original)
(Example 1)
Copy A
(Shorter than
the original)
Copy A
(Shorter than
the original)
(Example 2)
Copy B
(Longer than
the original)
Copy B
(Longer than
the original)
Paper exit direction
a > Magnification ration in the main scanning direction
b > Magnification ratio in the sub scanning direction
b > Magnification ratio in the sub scanning direction
Scale
7 – 12
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