AR-C270 (serv.man11). (Section 7) Settings Adjustments M17-M20 - Sharp Copying Equipment Service Manual (repair manual). Page 16

If it is difficult to adjust the color balance adjustment (Manual) with
SIM 46-21 satisfactorily, do not register the service target gamma
data with SIM 63-7.

5) Press the EXECUTE key.

The color patch image (adjustment pattern) is read.

6) Press the REPEAT key and set the second color patch image (ad-

justment pattern) on the original table.

The color balance (gamma) target setup level of each color can be
checked with K/C/M/Y keys.

The setup level values must be in the ascending sequence of B - 0. If
there is no change or the sequence is reversed, it is judged as an ab-
normality.

In case of an abnormality, resolve the problem and check again.

7) Press the OK key.

The color balance (gamma) corresponding to the color patch im-
age (adjustment pattern) printed in the copy color balance adjust-
ment (manual adjustment) (ADJ M17/ADJ 3) is set as the service
target.

Do not execute this procedure unless there is any special reason.

∗

Only when the factory target is judged as abnormal in the
automatic color balance adjustment by SIM 46-24, this procedure
is required in the following case:

∗

When the ICU EEPROM data are destroyed by U2 trouble.

When SIM 63-8 is executed, the service target gamma data are
changed to the default target gamma data determined by the machine
design.

When the color balance adjustment (Auto) is executed with the serv-
ice target gamma data set to the default target gamma, a virtually sat-
isfactory result will be obtained.

1) Enter the SIM 63-8 mode.

2) Press the EXECUTE key.

3) Press the YES key.

The service target becomes the same as the default (standard)
target.

NOTE for SIM 46-1 and 46-2:

The major purpose of these simulations is to delete background copy
simply.

SIM 46-1 and 46-2 are used to adjust the copy density in the low-den-
sity area, and they do not affect the density in the high-density area.

Note that the tone and the color phase may be changed greatly if the
set value is changed greatly.

When an extreme background copy is produced, use ADJ M17/ADJ 3
Color balance adjustment (Manual) (SIM 46-21) instead of this proce-
dure.

The adjustment result of SIM 46-1 is reflected evenly to all the color
copy modes.

The adjustment result of SIM 46-2 is reflected evenly to all the mono-
chrome copy modes.

1) Enter the SIM 46-1 or 46-2 mode.

(AR-C150)

(AR-C250/C160/C270)

2) Select the copy mode to be adjusted with the scroll key.

3) Enter the adjustment value with the 10-key, and press the [OK]

key.

To increase the density in the low-density area, set a greater adjust-
ment value. To reduce the density, set a lower adjustment value. The
adjustment in the low-density area can be adjusted individually for
each copy mode.

The greater the set value is, the greater the density in the low-density
area is, and vice versa. (The density in the high-density area is not
changed.)

4) Cancel the simulation mode, and make a copy in the normal mode

to check the copy density in the white area and the low-density
area by using the test chart (UKOG-0283FCZZ).

In this simulation mode, press CLOSE key to jump to the normal copy
mode and make actual copies of the service chart and user docu-
ments. In this manner, the adjustment result can be checked.

The adjustment can be performed also by switching between the
simulation mode and the normal copy mode alternately and checking
the adjustment result with actual copies.

7 – 39