AR-C270 (serv.man11). (Section 7) Settings Adjustments M17-M20 - Sharp Copying Equipment Service Manual (repair manual). Page 5

Check the color balance and the density by making copies of Sharp
gray chart and the serviceman chart.

To check the copy color balance and the density, use Sharp gray
chart and the serviceman chart and set the copy density in the
Text/Printed Photo mode (AR-C160/C250/C270) Text/Photo mode
(AR-C150) to Manual 3 and make a copy in the color mode and in the
black and-white mode.

At that time, all the color balance adjustments of the user adjustment
mode must be set to the default (center).

Be sure to use the specified paper for color.

The copy image density of Sharp gray chart must be as follows:

NOTE: Use the color test chart (UKOG-0283FCZZ) to check the

color balance.

(Color copy)

<AR-C150/C250/C160/C270>

(Black-and-white copy)

<AR-C150>

<AR-C250/C160/C270>

Check the color balance of Serviceman chart copy is as shown below.

(Color copy)

<AR-C150/C160/C250/C270>

This adjustment must be performed in the following cases:

•

When the CCD unit is replaced.

•

When a U2 trouble occurs.

•

When the PCU main PWB is replaced.

•

When the EEPROM of the PCU main PWB is replaced.

•

When replacing a part in the scanner (reading) section.

When the CCD unit is replaced, be sure to perform this adjustment.

1) Check that the table glass and No. 1, 2, 3 mirrors and lenses are

free from dust and dirt. (If there is dust and dirt, clean with alco-
hol.)

2) Check that there is no dirt or scratch on BK1 and BK2 patches of

SIT chart (UKOG-0280FCZZ).

If there is dirt, clean with alcohol.

If there is scratch, replace the chart with new one.

1) Set the SIT chart (UKOG-0280FCZZ) to the left edge of the origi-

nal table, and fit the center of SIT chart with the center of the glass
holder.

When SIT chart is not available, execute SIM 63-5 to set the CCD
gamma to the default. This method, however, provides a lower adjust-
ment accuracy than the method by using SIT chart.

NOTE: Check that the SIT chart (UKOG-0280FCZZ) is closely

placed on the original table.

2) With the SIT chart fixed, close the original cover.

3) Enter the SIM 63-03 mode, and press the [EXECUTE] key.

The automatic adjustment is started. During the automatic adjust-
ment, the [EXECUTE] key is highlighted. When the adjustment is
completed, the key returns to the normal display.

NOTE: The SIT chart (UKOG-0280FCZZ) is affected by light (espe-

cially by ultraviolet rays) and temperature and humidity. Put it
in a bag (clear file, etc.) and store in a dark place.

This adjustment must be performed in the following cases:

•

When a consumable part (developer, OPC drum, the transfer belt)
is replaced.

•

When the CCD unit is replaced.

•

When a U2 trouble occurs.

•

When the ICU main PWB is replaced.

•

When the EEPROM of the ICU main PWB is replaced.

The color balance adjustment (auto adjustment) is the automatic ad-
justment of cyan, magenta, yellow, and black copy density with SIM
46-24.

(There are following two modes of auto color balance adjustment.)

1

2

3

4

5

6

7

8

9

10

W

SHARP gray chart

Patch 2 is clearly copied. 

Patch 1 is slightly copied.

1

2

3

4

5

6

7

8

9

10

W

SHARP gray chart

Patches 1 and 2 are not copied.

Patch 4 is copied.

Patch 3 is slightly copied.

1

2

3

4

5

6

7

8

9

10

W

SHARP gray chart

Patch 1 is not copied.

Patch 3 is copied.

Patch 2 is slightly copied.

Serviceman chart (Color patch section)

The background may
be slightly copied.

No great difference with
the original (Whole copy
of the patch section)

Patch 7 and the following must be copied.
Density balance of each color must be proper.

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