Sharp AR-C150 Service Manual page 29

15) Use the test chart UKOG-0283FCZZ and check the copy color
balance and the density in Text/Photo mode. (Refer to the
section of the copy color balance and the density.)
Repeat procedures 13) – 15) until the specified level is obtained.
However, repetition is limited to three times.
If repetition of the above procedures does not set the copy color
balance and the density to the specified level, there may be some
other reason.
Investigate the reason and repair or fix the problem, then perform all
the procedures of print quality adjustment from the beginning.
If the above conditions are not satisfied, perform the manual adjust-
ment (SIM 46-21 (ADJ M17/ADJ3).
(Auto color calibration by the user (Auto color balance
adjustment))
1) Enter the user program mode.
2) Enter the copy mode.
3) Press the auto color calibration key.
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 3) 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.
ADJ 3 Copy color blance adjustment (Manual)
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 the color balance.
a. Note for the adjustment
This adjustment is performed only for the color patch whose result of
the previous automatic adjustment is unsatisfactory.
b. Adjustment procedures
Before performing the adjustment, check that the conditions below
are satisfied.
∗
The copy density level of each copy mode is set to the default
(center value).
∗
The gamma of each copy mode is set to the default (500).
(Set the gamma set value of SIM 46-20 to the default (500).)
∗
The user program mode color balance must be set to the default.
1) Enter the SIM 46-21 mode.
2) Select PAPER SEL with the scroll key and select A3 (11 × 17)
paper.
Enter the set value corresponding to the paper seed 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.
High density
C
M
Y
Bk
CMY
mixed
color
Max
O N M
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.
5) Select the color to be adjusted and select the adjustment point
with the scroll key.
6) Enter the adjustment value with the 10-key and press the OK key.
The adjustment value can be selected in the range of 245 – 755.
When SIM 46-24 is used to perform the automatic color balance
and the density adjustment, all the set values of this simulation are
set to 500.
To increase the density, increase the adjustment value. To
decrease the density, decease the adjustment value.
Repeat procedures 3) – 6) until the condition of procedure 4) is satis-
fied.
7 – 24
AR-C150
Fig. 1 PG image
Low density
L K J I H G F E D C B
3) B - E patches of each color of
Y, C, M, and Bk are copied very
slightly.
2) The patch A of each
color is not copied.
6) There is not so great
difference between
CMY mixed color and
BK monochrome.
A