Sharp AR-285 (serv.man11) Service Manual ▷ View online
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
2) Cut the paper along the lead edge of the scale image.
3) Place the scale on the document table as shown below.
Place the scale at the center along the document guide as
shown below.
shown below.
4) Execute SIM 50-2.
5) Set IMAGE LOSS and DEN-A to 20.
6) Set L1, L2, and L3 to 0.
7) Make a copy at 400%. (Document table mode)
8) Measure the dimension of L1 and L2 of the scale copy image.
7) Enter the actual measurement value of distance L1 to L1 on the
operation panel in the unit of 0.1mm.
8) Enter the actual measurement value of distance L2 to L2 on the
operation panel in the unit of 0.1mm.
9) Set the document made in procedure 1) and procedure 2) on the
SPF and make a copy at 200%. (SPF mode)
10) Measure the dimension of L3 of the scale copy image.
11) Multiple the measured values (mm) with 10, and enter the prod-
ucts to L1, L2, and L3.
12) Set the copy magnification ratio to 100% and make a copy.
Change the set value of DEN-B and adjust the rear edge void
area.
area.
If the adjustment is incomplete or if a fine adjustment is required,
change the adjustment values.
change the adjustment values.
When the adjustment value is changed by 1, the following items
are changed on the copy by 0.1mm.
are changed on the copy by 0.1mm.
Code
Adjustment item
Adjustment
value
Note
A L1
Distance between the image lead
edge and 10mm of the scale
edge and 10mm of the scale
When the image
lead edge is varied
depending on the
copy magnification
ratio, change the set
value.
lead edge is varied
depending on the
copy magnification
ratio, change the set
value.
B L2
Distance between the paper lead
edge and the image lead edge
edge and the image lead edge
C L3
Distance between the image lead
edge and 10mm of the scale
(SPF mode)
edge and 10mm of the scale
(SPF mode)
When the image
lead edge is varied
depending on the
copy magnification
ratio, change the set
value.
lead edge is varied
depending on the
copy magnification
ratio, change the set
value.
D IMAGE
LOSS
Lead edge image
loss
loss
1.5 to
3.0mm
3.0mm
When the set value
is increased, the
image loss is
increased.
is increased, the
image loss is
increased.
E DEN-A Lead edge void area 1.5 to
3.0mm
When the set value
is increased, the
void area is
increased.
is increased, the
void area is
increased.
F DEN-B Rear edge void area 1.5 to
3.0mm
When the set value
is increased, the
void area is
increased.
is increased, the
void area is
increased.
100
110
120
130
150
140
10
20
90
30
80
70
60
50
40
Scale lead edge
Paper
Cut the paper along this line.
10
20
30 40 50 60 70
80 90
50 100 110 120 130 140
Scale
Paper (White paper)
10
20
30
40
50
L1
L2
Paper lead
edge
edge
400% enlargement copy
10
20
30
40
50
L3
L2
Paper lead
edge
edge
200% enlargement copy
7 – 13
(8) Original off-center adjustment
1) Place the reference original for the off-center adjustment on the
original table.
2) Execute SIM 50-12.
3) Press the PRINT button after lighting the RPL, and a coy will be
made. If the arrow image on the copy paper is shifted from the
center line as shown below, change the set value and adjust.
center line as shown below, change the set value and adjust.
In the case of A
decrease the set value.
In the case of B
increase the set value.
Adjustment specification:
Within
±
1.7mm
(One point of the set value corresponds to the change of about
0.1mm.)
0.1mm.)
[In the case of the AR-280]
4) Make a copy of A4 original with the SPF, and measure the off-
center.
5) Change value C so that the off-center is within the specified
range.
[In the case of the AR-285/335]
4) Make a copy of A4 original with the RADF, and measure the
off-center.
5) Change value B so that the off-center is within the specified
range.
6) Press the CA key to cancel the simulation.
D. Image process
••
Image density adjustment
The adjustment simulations for each mode are as shown in the table
below.
below.
Adjustment for
each density
mode
Each
adjustment
2-value
mode
mode
Auto mode
SIM46-2
Character mode
SIM46-9
Character/Photo
mode
mode
SIM46-10
Photo mode
SIM46-11
HiFi mode
Auto mode
SIM46-3
Text mode
SIM46-5
Text/Photo mode
SIM46-6
Photo mode
SIM46-7
(1) Test chart setting
1) Place a test chart (UKOG-0162FCZZ) on the original table.
2) Place several sheets of A3 white paper (Sharp’s specified paper)
on the test chart at the center reference.
Test chart comparison
UKOG-0162FCZZ
DENSITY No.
1
2
3
4
5
6
7
8
9
10
W
UKOG-0089CSZZ
DENSITY No.
0.1
0.2
0.3
0.5 1.9
0
KODAK GRAY
SCALE
1
2
3
4
19
A
SHARP
CORPORATION
MADE IN JAPAN
Image loss
Lead edge void area
Rear edge void area
A
B
Paper exit
direction
direction
Paper center
UKOG-0162FCZZ
1
10
W
2
3
4
5
6
7
8
9
7 – 14
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