Sharp AR-280 Service Manual page 63

·
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%.
·
For fine errors which cannot be adjusted with this adjust-
ment, use the next simulation SIM 48-1.
(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)
Scale a
10 20 30 40 50 60 70 80 90 50 100 110 120 130 140
Scale b
3) Make a normal copy and obtain the main/sub scanning direction
magnification ratios.
Copy magnification ratio (MRCP)
(Original
dimension – Copy dimension)
=
Original dimension
(Example 1)
Copy A
10 20
(Shorter than
the original)
Scale
10 20
(Original)
(Example 2)
Copy B
10
(Longer than
the original)
illust: AR-280
´ 100%
90 100 110
90 100 110
20 90 100 110
4) Execute SIM 48-1.
(AR-501/505/507)
(Other models)
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
·
When the copy dimension is greater than the original
When the value is changed by one step, the ratio is changed
by about 0.1%.
Paper exit direction
a > Magnification ratio in the main scann ing direction
b > Magnification ratio in the sub scanning direction
[AR-280/281 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 scanning
direction is within the specified range.
9) Press the CA key to cancel the simulation.
6 – 13
¯
Make the value greater.
¯
Make the value smaller.
7/13/2000