Read Sharp AR-285 (serv.man11) Service Manual online
(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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