AR-C270 (serv.man11). (Section 7) Settings Adjustments M17-M20 - Sharp Copying Equipment Service Manual (repair manual). Page 6

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 copy 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.
While the automatic color balance adjustment by the serviceman al-
lows adjustment even when the machine environment is changed
largely, providing normal color balance. If there is a basic problem in
the machine, repair it and adjust to provide normal color balance.
The above points must be fully understood for proper operation.

When this adjustment is performed, the color balance adjustment of
all the copy modes are changed.
(However, the color balance adjustment level of the user program is
not changed.)

1) The print engine section must be properly adjusted. (ADJ M1 –

M16)

2) CCD gamma adjustment must be properly adjusted. (ADJ

M17/ADJ 1)

3) When setting the color patch image (adjustment pattern) paper on

the original table, place 5 sheets of white paper on the color patch
image paper.

4) Be sure to use the specified color paper.

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)

1) Enter the SIM 46-24 mode.

2) Select A3 or 11 

×

 17 paper (auto select) and press the EXECUTE

key.
The color patch image (adjustment pattern) is printed.

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

dure 2) on the original table so that the dark density side of the
color patch image comes to the left side. Place 5 sheets of white
paper on the color patch image (adjustment pattern) paper.

4) Press the FACTORY key on the operation panel and press the

EXECUTE key.
The copy color balance adjustment (step 1) is automatically per-
formed, and the color balance check patch image is printed. Wait
for a while until the operation menu of procedure 5) is displayed.
When the color balance is customized by the manual color bal-
ance (SIM 46-21) according to the user’s request and then the
color balance is registered as the service target by SIM 63-7, se-
lect the service target in order to adjust to that color balance.

NOTE: (Descriptions on the factory and the service key button in the

color balance automatic adjustment menu)

There are two kinds of gamma targets for the color balance
automatic adjustment: factory and service. The factory key
button and the service key button are used to select between
them.

Factory target gamma: Standard color balance (Fixed)

Service target gamma: Color balance can be customized ac-
cording to the user request. (Variable)

When shipping from the factory, the service target gamma
data are same as the factory target gamma data.

Both are set to the standard color balance gamma.

In the service target, a customized color balance can be reg-
istered with SIM 63-7. In the factory target, it cannot be
changed.

5) Press the REPEAT key on the operation panel.

6) Press the EXECUTE key.

The color patch image (adjustment pattern) is printed. 

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

dure 6) 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.

8) Press the EXECUTE key.

The copy color balance adjustment (step 2) is automatically per-
formed, and the color balance check patch image is printed.
Wait for a while until the operation menu of procedure 9) is dis-
played.

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