Sharp MX-4100N Service Manual page 57

9) If the adjustment result reaches the satisfactory level, tighten
the adjustment screw.
(The black image skew adjustment is completed with the
above.)
10) In the above black image skew adjustment, check the color
image skew pattern printed when completion of the adjust-
ment.
*A: Rough adjustment print pattern
*B: Fine adjustment print pattern
In each Y/M/C color print pattern printed separately in the front
frame direction and in the rear frame direction, note the same
print color pattern and check to confirm that the difference in
the highest density sections is within ±1 step.
(Compare the front and the rear frame positions of the same-
color print color patterns. All the highest density sections of all
the print color patterns may not be aligned on a line. Compare
only the same-color patterns.)
If the above condition is not met, do the following:
11) Turn the image skew adjustment screw of the target color to
adjust.
M
Y
When each adjustment screw is turned, it clicks. Turn it by
5 - 6 clicks and the check pattern is changed by 1 step (1
dot size).
When the image skew pattern on the front frame side is
skewed in the arrow direction of A (to the smaller number) from
the rear frame side, turn the adjustment screw counterclock-
wise. When the image is skewed in the arrow direction of B (to
the larger number), turn the adjustment screw clockwise.
12) Print the check pattern.
13) Check the color image skew pattern.
Repeat procedures 11) - 13) until a satisfactory result is obtained.
The image skew adjustment (LSU unit) is executed by changing
the parallelism of the LSU unit scan laser beam for the OPC drum.
*B
*A
Direction A Direction B
*B
C
MX-5001N ADJUSTMENTS 5 – 15
ADJ 7
OPC drum phase adjustment
This adjustment is needed in the following situations:
* When the color shift occurs.
* When the photoconductor drum is replaced.
* When the OPC drum is removed from the main unit.
* When the OPC drum drive section is disassembled.
* When the OPC drum drive unit is replaced.
* U2 trouble has occurred.
* When the PCU MAIN PWB is replaced.
* When EEPROM on the PCU MAIN PWB is replaced.
* When the color image sensor (image registration sensor F) is
replaced.
* When the color image sensor (image registration sensor R) is
replaced.
7-A OPC drum phase adjustment
(Auto adjustment)
1) Enter SIM50-22 mode.
EXECUTE
2) Press [ALL] key.
(The machine enters the OPC drum phase adjustment mode/
image registration adjustment (auto adjustment) mode, and
both adjustments are executed simultaneously in this mode.)
The OPC drum phase adjustment and the image registration
adjustment can be individually executed by [REGIST] button
and [DRUM POS] button. Since, however, the image registra-
tion adjustment must be executed when the OPC drum phase
adjustment is completed, both adjustment are executed in this
adjustment simultaneously.
3) Press [EXECUTE] key.
The OPC drum phase adjustment and the image registration
adjustment are executed automatically.