Sharp AR-280 Service Manual page 40

AR-405
(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 20
(Longer than
the original)
4) Execute SIM 48-1.
1/21/1999
× 100%
90 100 110
90 100 110
90 100 110
7 – 12
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%.
Paper exit direction
a > Magnification ration in the main scanning direction
b > Magnification ratio in the sub scanning direction
[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) Copy image position, image loss, void area
adjustment
Before performing this adjustment, check that SIM 50-5 is set to 50. If
not, set it to 50.
This adjustment uses SIM 50-2 and SIM 50-1.
The above two simulations are used in the following manner.
Sim 50-2: Rough adjustment
SIM 50-1: Fine adjustment
If the desired value is obtained by SIM 50-2, there is no need to
perform SIM 50-1.
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