MX-4100N, MX-4101N, MX-5000N, MX-5001N (serv.man13). Service Manual-Section 5-Adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 13

MX-4101N  ADJUSTMENTS  5 – 13

 

This adjustment is needed in the following situations:
* When the color shift occurs.
* When the LSU unit is replaced.
* When the LSU unit is removed from the main unit.
* When a color image registration mistake occurs.
* When the unit is installed or when the installing site is changed.

(Required depending on the cases.)

* When there is an uneven density area or a difference in color

balance in the main scanning direction (back and forth).

* When the color phase is not matched by the color balance

adjustment.

* When the OPC drum drive unit is replaced.
* When the primary transfer unit is replaced.

NOTE: This adjustment can be executed efficiently by executing

the following procedures in advance.
The black (K) image skew, however, must be properly
adjusted for that.

1)

Press [REGIST] button in SIM50-22 mode to execute the auto-
matic image registration adjustment.

2)

The current skew level is displayed on the SKEW display
menu.

3)

Put down the displayed skew level value.

(Meaning of the skew level value)
* When "R" is displayed in front of the value, turn and click the

skew adjustment screw (LSU) clockwise by the number of the
value.

* When "L" is displayed in front of the value, turn and click the

skew adjustment screw (LSU) counterclockwise by the number
of the value.

At that time, the fractional part after the decimal point is rounded.

NOTE: The K (black) image skew level cannot be checked with

this adjustment.
To check and adjust the K (black) image skew, follow the
procedures below and execute the adjustment.

1)

Enter SIM61-4 mode.

2)

Select the paper feed tray with A3 (11" x 17") paper in it by
changing the value of set item B.

3)

Press [EXECUTE] key.
The check pattern is printed out.

4)

Check the printed black image for any skew.
Measure the right angle level by using the six cross patterns
printed in black.
There are following two methods of checking the black image
for any skew (right angle).
Method 1: 
Measure the length of the diagonal lines of the rectangle print
pattern. Check the difference in the length of the diagonal lines
for judgment of good or no good
Method 2: 
Compare the right angle of vertical side/horizontal side of the
rectangle print pattern and the right angle sides of A3 or 11 x
8.5 paper for judgment of good or no good.
(NOTE) In the case of Method 2, the right angle of paper to be
used may not be exact. Be sure to check the right angle of
paper to be used in advance.
(Method 1)
a) Measure the length of the diagonal lines of the rectangle
print pattern.

b) Calculate the difference between the measured lengths C
and D of the diagonal lines.
c) Check to insure that the difference between C and D is in
the following range. C – D = 

±0.8mm

If the difference between C and D is in the above range, there
is no need to adjust.

or end of print

EXECUTE

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Diagonal line D

Diagonal line C