Sharp AR-C150 Manuale Utente Scaricare il pdf (Pagina 27)

Copy color balance and density check

Check the color balance and the density by making copies of Sharp

gray chart and the serviceman chart.

a. Note for the copy color balance check

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/Photo mode to Manual 3 and make a copy in the color mode and

in the black and-white mode. At that time, the color balance adjust-

ment of the user program must be set to the default (center).

Be sure to use the specified paper for color.

[Sharp gray chart]

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

(Color copy)

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

color balance.

(Black-and-white copy)

[Serviceman chart (UKOG-0283FCZZ)]

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

(Color copy)

ADJ 1 CCD gamma adjustment

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

(1) Precautions for 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 al-

cohol.)

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.

(2) Adjustment procedures

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

original 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.

The life of the SIT chart is one year. Check the manufactur-

ing date specified on the chart and replace every one year.

If the SIT chart is not available, execute SIM 63-5 instead of the

above procedure. This sets the CCD gamma to the default. The ac-

curacy of this method is lower than the method using the SIT chart.

ADJ2 Auto color balance adjustment

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 the scanner (reading) section is cleaned.

• When a U2 trouble occurs.

• When the ICU main PWB is replaced.

• When the EEPROM of the ICU main PWB is replaced.

a. Outline

The color balance adjustment (auto adjustment) is the automatic ad-

justment of cyan, magenta, yellow, and black copy density with SIM

46-24 or the user program.

There are following two modes of auto color balance adjustment.

1) Auto color balance adjustment by the serviceman (with SIM 46-

24)

2) Auto color balance adjustment by the user (with the user program)

(The color balance target becomes the service target.)

The auto color balance adjustment by the user is provided in order to

reduce the number of service calls.

If the coy color balance is shifted by some reason, the user performs

the color balance adjustment to correct it.

If, however, there is a basic problem in the machine, or if the machine

environment is changed largely, this function does not serve as an ef-

fective means.

12345678910 W

SHARP GRAY CHART

SHARP gray chart

Patch 2 is clearly copied.

Patch 1 is slightly copied.

12345678910 W

SHARP GRAY CHART

SHARP gray chart

Patches 1 and 2 are not copied.

Patch 4 is copied.

Patch 3 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.

AR-C150

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Sharp AR-C150 Manuale Utente Pagina 27

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