MX-6240N, MX-7040N (serv.man17). Service Manual (Revised May 2017). - Sharp Copying Equipment Service Manual (repair manual). Page 125

MX-7040N  ADJUSTMENTS AND SETTINGS  5 – 69

Watermark adjustment in the system setting
System setting - Security setting - Watermark print - 
Contrast tab

CAUTION:

Note for adjusting the watermark with SIM46-54
When the color balance automatic adjustment is executed with
SIM46-74 or SIM46-24 but the containing characters are
reproduced, use SIM46-54 to execute the color balance auto-
matic adjustment for each dither.
However, note the following items.
-  When either of item K or L of the PATTERN mode is 42, the

adjustment must be executed for the both modes of
WOVEN1 and WOVEN2 of SIM46-54.

-  When either of item K or L of the PATTERN mode is 43, the

adjustment must be executed for the both modes of
WOVEN3 and WOVEN4 of SIM46-54.

-  WOVEN1 and WOVEN2 must be adjusted in a pair as well

as WOVEN3 and WOVEN4.
If it is ignored, the containing characters remain reproduced.

 

Requisite condition before execution of the printer color bal-
ance/density adjustment
Before execution of the printer color balance/density adjustment,
the copy color balance/density adjustment must have been com-
pleted properly.

This adjustment is required in the following cases.
* Basically same as when the copy color balance/density adjust-

ment is required.

* After the copy color balance/density adjustment.

 

a. General
The color balance adjustment (auto adjustment) is used to adjust
the print density of each color (Cyan, Magenta, Yellow, Black) auto-
matically with SIM 67-24 or the user program.
When this adjustment is executed, the color balance adjustments
of all the print modes are revised.

There are following two modes in the auto color balance adjust-
ment.
1)

Auto color balance adjustment by the serviceman (SIM 67-24
is used.)

2)

Auto color balance adjustment by the user (The user program
mode is used.) (The color balance target is the service target.)
The auto color balance adjustment by the user is provided to
reduce the number of service calls.
If the print color balance is lost for some reasons, the user can
use this color balance adjustment to recover the balance.
When, however, the machine has a fatal problem or when the
machine condition is greatly changed, this function does not
work effectively.
On the other hand, the auto color balance adjustment by the
serviceman functions to recover the normal color balance
though the machine condition is greatly changed. If the
machine has a fatal problem, repair and adjust it for obtaining
the normal color balance.
To perform the adjustment, the above difference must be fully
understood.

Character 
appearing

To increase the 
text density

Decrease the contrast value. 
(Default: 5)

To decrease the 
text density

Increase the contrast value. 
(Default value: 5)

Background 
appearing

To increase the 
text density

Increase the contrast value. 
(Default value: 5)

To decrease the 
text density

Decrease the contrast value. 
(Default: 5)