AR-C270 (serv.man11). (Section 7) Settings Adjustments M17-M20 - Sharp Copying Equipment Service Manual (repair manual). Page 8

4) Press the EXECUTE key.

The color patch image (adjustment pattern) is printed.

5) Set the color patch image (adjustment pattern) printed in proce-

dure 4) on the original table so that the darker density side comes
to the left side. Place 5 sheets of white paper on the color patch
image (adjustment pattern) paper.

6) Press the EXECUTE key. 

The copy color balance adjustment (step 2) is automatically per-
formed. After completion of the adjustment, the display returns to
the original menu. 

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.

The color balance adjustment (Manual) is used to manually adjust
each color copy density (C, Y, M, K) (15 points for each color) when
the result of the previous automatic adjustment is unsatisfactory or
when a fine adjustment is required, or when the user requests to
change (customize) the color balance.

This adjustment is performed only for the color patch whose result of
the previous automatic adjustment is unsatisfactory.

If the color balance is out of the normal conditions, execute SIM 46-
24 to make the color balance adjustment (Manual) and then execute
this adjustment. This sequence leads to a better work efficiency.

Before execution of the copy quality check and the copy quality ad-
justment, be sure to execute the following corrections forcibly to set
the image forming section to the optimum state.

•

Execute the process correction forcibly. (SIM 44-6)

•

Execute the half-tone image correction forcibly. (SIM 44-26)

∗

Before executing the copy color balance adjustment (Manual),
perform SIM 44-6 to make a compulsory process correction,
updating the developing bias voltage and the main charger voltage
to the latest levels.

When EXECUTE key is pressed, the operation is started.

It takes several minutes to complete the operation. When the opera-
tion is completed, "COMPLETE" is highlighted.

After completion of the operation, cancel the simulation.

1) Enter the SIM 46-21 mode.

(AR-C150/C250)

(AR-C160/C270)

2) Select PAPER SEL with the scroll key and select A3 (11 

×

 17) pa-

per.
Enter the set value corresponding to the paper feed section with
A3 (11 

×

 17) paper in it, and press the OK key.

3) Press the [EXECUTE] key.

The color balance adjustment pattern is printed.

4) Check that the printed pattern is in the following specification or in

the desired color balance.
If not, perform the following procedures.

Max

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

C

M

Y

Bk

Fig. 1 PG image

High density

Low density

CMY
mixed
color

1) The max. density
     section is not blurred.

5) The gray balance for CMY mixed color
    patch is not shifted so much.

4) Patch for each of C, M, Y, BK

The patch density is identical between patches or not
reversed.
The patch density is changed gradually.

3) B - E patches of each color of
    Y, C, M, and Bk are copied very
     slightly.

2) Patch A of each Y/M/C/Bk
    color is not copied.

6) There is not so great 
    difference between
    CMY mixed color and
    BK monochrome.

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