AR-C330 (serv.man5). ARC330-Service Manual - Sharp Copying Equipment Service Manual (repair manual). Page 117

AR-C330  SETTING AND ADJUSTMENTS  7 - 38

This adjustment is the CCD gamma adjustment (CCD calibration)
for the copy document copy mode, and is different from the CCD
gamma adjustment (CCD calibration) in the normal document
copy mode (ADJ M17/ADJ 1). There are above two kinds of the
CCD gamma adjustment (CCD calibration), and both adjustments
are required.

This adjustment is required in the following cases:

• After completion of the CCD gamma adjustment (CCD calibra-

tion) (Normal original copy mode) (ADJ M17/ADJ 1)

∗

Check that the table glass, No. 1/2/3 mirrors, and the lens sur-
face are free from dirt and dust.
(If dirt or dust is found, clean with alcohol.)

∗

Check that the patches of BK1 and BK2 of the SIT chart
(UKOG-0280 FCZZ are free from dirt or dust.
If dirt or dust is found, clean with alcohol.
If any damage is found, replace with a new one.

∗

Since this adjustment is based on the normal document copy
mode CCD gamma adjustment (CCD calibration) (ADJ M17/
ADJ 1), the said adjustment must have been completed before
execution of this adjustment.
The copy color balance must also have been adjusted properly.

1) Place the SIT chart (UKOG-0280FCZZ) on the left edge of the

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

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

contact with the document table.

2) Close the document cover without shifting the SIT chart

(UKOG-0280FCZZ).

3) Make a copy in the Text/Printed Photo mode. (Be sure to use

the specified copy paper.)

4) Set the copy made in procedure 3) on the document table so

that the center of the copy paper comes to the center of the
left edge of the document table.

5) Enter the SIM 63-09 mode and press the [EXECUTE] key.

The automatic adjustment is performed. During the adjustment,
the [EXECUTE] key is highlighted. When the adjustment is com-
pleted, the [EXECUTE] key returns to the normal display.

6) Cancel the simulation mode.

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

(especially ultra-violet rays) and temperature and humid-
ity. Store it in a clear file (nylon file) in a dark place.

The gamma of black toner component images is changed to
adjust the reproduction of the profile of the black character and
line optionally. Especially the thickness of fine black character and
line is changed.

Since the black toner component image quantity differs depending
on the copy mode, be careful of the copy mode selection to check
the adjustment result. Check in the Text/Printed Photo mode.

This adjustment is valid only in the following copy modes:

• Text copy mode

• Text Printed Photo copy mode

• Text Photo copy mode

The black toner component ratio is greatest in the Text copy
mode, and smallest in the Text Photo copy mode.

This adjustment is required in the following cases when the default
was changed:

• When U2 trouble occurs.

• When the ICU MAIN PWB is replaced.

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

1) Enter the SIM 46-27 mode.

2) Enter the adjustment value with the 10-key.

The greater the adjustment value is, the greater the density is,
and vice versa.

Normally set to the default (50).

3) Press the [OK] key.

4) Cancel the simulation, and make a copy in the Text/Printed

Photo mode to check the reproduction of fine black character
and line.

Use a document with black characters and lines on it for
checking.