MX-1800N (serv.man14). Section 6 - Adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 55

MX-1800N  ADJUSTMENTS  6 – 55

(Abnormal end (Auto transition))

9) After completion of the operation, cancel SIM 44-26.
10) Use SIM 64-5 to print the print test pattern again.

Set each set value to the default and touch [EXECUTE] key.
The print test pattern is printed out.
The print density must be changed gradually from the lighter
level to the darker level. The density changing direction must
not be reversed. The density level of each color must be
almost at the same level.
If the color balance is customized, use SIM 67-27 to register
the color balance as the service target.
If the color balance is not customized, this procedure is not
required.
If the customized color balance is registered as the service tar-
get, the automatic color balance adjustment can be made in
the next color balance adjustment.
In the next color balance adjustment, select the service target
color balance in the automatic color balance adjustment mode
to make an adjustment to the similar color balance as the reg-
istered color balance.

a. General
When the automatic color balance adjustment is executed, a cer-
tain color balance (gamma) is used as the target.
There are following three kinds of the target.
• Factory color balance (gamma) target
• Service color balance (gamma) target
• User color balance (gamma) target
In the above three, only the service color balance target can be set
to a desired level.

This adjustment is required in the following cases.
* When the copy color balance/density adjustment (manual adjust-

ment) is executed with SIM 67-25.

* When a U2 trouble occurs.
* When the MFP PWB is replaced.
* When the EEPROM on the MFP PWB is replaced.
* When the user requests for customizing the color balance.
* When the service color balance target gamma is judged as

improper.

• Color balance target for the printer color balance adjustment

K

M

Y

C

SIMULATION NO.44-26

TEST

HALF TONE DENSITY CORRECT EXECUTION

[S_VALUE]

#1: ERR, #2: ERR, #3: ERR, #4: ERR, #5: ERR

#6: ERR, #7: ERR, #8: ERR, #9: ERR, #10: ERR

#11: ERR, #12: ERR, #13: ERR, #14: ERR,#15: ERR

1/1

EXECUTE

CLOSE

0

A

Factory color 
balance (gamma) 
target

There are three kinds of the color balance target, 
and each of them is specified according to the 
machine design. Use SIM 67-26 to select one of 
them as the factory target. The default setting 
(factory setting) is the color balance (DEF1) 
which emphasizes color reproduction.

B

Service color 
balance (gamma) 
target

This target is used when the user requests to 
customize the color balance to user’s desired 
level. In advance, the user’s unique color 
balance must be registered as the service color 
balance target. 
The above registration (setting) is made by the 
serviceman with SIM 67-25 to adjust the color 
balance and with SIM 67-27 to register it. 
This color balance target is used when the user 
executes the color balance adjustment. 
When, therefore, the service color balance target 
is changed, the color balance target of the user’s 
color balance adjustment is also changed. 
When, however, SIM 67-28 is executed, the color 
balance is set to the factory color balance target 
set with SIM 67-26. 
The default setting (factory setting) of the color 
balance is same as the factory color balance 
target. (Emphasized on color reproduction 
(DEF1))
If the user does not request for customizing the 
color balance, be sure to use SIM 67-28 to set 
the color balance to the factory color balance 
target.

C

User color 
balance (gamma) 
target

Same color balance as the service color balance 
(gamma) target
When the service color balance target is 
changed, this color balance target is also 
changed accordingly.