D. Image Density Adjustment - Sharp AR-280 Service Manual

(8) Original off-center adjustment
1) Place the reference original for the off-center adjustment on the
original table.
2) Execute SIM 50-12.
(AR-501/505/507)
(Other models)
3) Press the PRINT button after lighting the RPL, and a copy 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.
Paper exit
direction
Paper center
In the case of A
In the case of B
Adjustment specification:
(One point of the set value corresponds to the change of
about 0.1mm.)
[In the case of the AR-280]
4) Make a copy of A4 (8 1/2 ´ 11)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 (8 1/2 ´ 11) 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.
7/13/2000
A B
decrease the set value.
increase the set value.
Within ± 1.7mm

D. Image density adjustment

The image density adjustment is required for the following copy qual-
ity mode by using the simulation.
There are two methods; the collective adjustment and the individual
adjustment of the copy quality mode.
Copy mode (AR-280/285/335)
Copy quality mode
Binary Auto mode
value mode
Character mode
Character/Photo mode
Photo mode
Multi value Auto mode
(Hifi) mode
Character mode
Character/Photo mode
Photo mode
Copy mode (AR-250/281/286/287/336/337/405/407)
Copy quality mode
Binary Auto mode
value
Character mode
mode
Character/Photo mode
Photo (error diffusion)
mode
Copy mode (AR-287/337/407/501/505/507)
Copy quality mode
Binary Auto mode
value mode
Character mode
Character/Photo mode
Photo (error diffusion)
mode
(1) Test chart setting
1) Place a test chart (UKOG-0162FCZZ) on the original table.
2) Place several sheets of A3 (11 ´ 17) white paper (Sharp's speci-
fied paper) on the test chart at the center reference.
UKOG-0162FCZZ
1 2 3 4
6 – 16
Collective Individual
adjustment adjustment
SIM46-2
SIM46-9
SIM46-10
SIM46-11
SIM46-3
SIM46-5
SIM46-6
SIM46-7
Collective Individual
adjustment adjustment
SIM46-2
SIM46-9
SIM46-10
SIM46-11
Collective Individual
adjustment adjustment
SIM46-2
SIM46-9
SIM46-10
SIM46-11
5 6 7 8 9 10
illust: AR-280
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