Sharp AR-C150 Service Manual page 28

AR-C150
While the automatic color balance adjustment by the serviceman al-
lows adjustment even when the machine environment is changed lar-
gely, 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.)
b. Note for performing the color balance adjustment
(Auto adjustment)
1) The print engine section must be properly adjusted. (ADJ M2 –
M16)
2) CCD gamma adjustment must be properly adjusted. (ADJ M1)
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.
c. Adjustment procedure
(Auto color balance adjustment by the serviceman)
1) Enter the SIM 46-24 mode.
2) Select A3 or 11 x 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 SERVICE key on the operation panel and press the EX-
ECUTE 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.
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.
9) Press the OK key on the operation panel.
The initial setup of half tone image correction is performed accord-
ing to this adjustment data.
10) Check that the color balance check patch image printed at last is
within the specified range shown below.
High density
C
M
Y
Bk
Max
O N M
1) The max. density
section is not blurred.
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.
11) Execute the half tone image correction. (Forcible execution)
(SIM 44-26)
12) 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.)
If the copy color balance and the density are not in the specified
level, perform the following procedures.
13) Perform initial setup of half tone image correction. (SIM 44-21)
14) Perform half tone image correction. (Forcible execution) (SIM
44-26)
7 – 23
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.
A