Sharp MX 3501N - Color Laser - Copier, Service Manual, Page: 57 / 448

MX3500N ADJUSTMENTS 6 – 12
(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 satisfied, execute the procedures
below.
11) Turn the image skew adjustment screw of the target color to
adjust.
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 character)
from the rear frame side, turn the adjustment screw counter-
clockwise. When the image is skewed in the arrow direction of
B (to the larger character), turn the adjustment screw clock-
wise.
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.
ADJ 7
OPC drum phase adjustment
This adjustment must be executed in the following cases:
* When the OPC 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.
* When U2 trouble occurs.
* When the PCU MAIN PWB is replaced.
* When EEPROM on the PCU MAIN PWB is replaced.
7-A OPC drum phase adjustment (Auto
adjustment)
1) Enter SIM50-22 mode.
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.
* After completion of the adjustment, the drum motor stops and
[EXECUTE] button returns to the normal display and the adjust-
ment result is displayed.
MAIN, SUB: Image regist adjustment value is displayed.
( ) is the difference from the previous adjustment value.
Example: This time 105.0, previous time 103.0: 105.0 (+2)
PHASE: OPC drum phase adjustment value is displayed.
( ) is the previous adjustment value.
Example: This time 90
°
, previous time 45
°
: 3 (2)
* In case of an error, "ERROR" is displayed with the details.
C Y M
EXECUTE
0
SIMULATION
ġ
NO.50-22
TEST
CLOSE
EXECUTE
ġ NOW EXECUTING …
0
SIMULATION ġ NO.50-22
TEST
CLOSE
EXECUTE
PRESS [EXECUTE] TO START
ERROR ȇ TONNER EMPTY
0
SIMULATION NO.50-22
TEST
AUTO ADJUSTMENT OF REGISTRATION ɕ DLUM POSITION
EXECUTE
C xxx (xx) xxx (xx) xxx (xx) xxx (xx)
M xxx (xx) xxx (xx) xxx (xx)
Y xxx (xx) xxx (xx) xxx (xx)
1/1
CLOSE
REGIST DRUM POS ALL
Normal end
MAIN R ,MAIN F SUB PHASE
Abnormal end
AUTO ADJUSTMENT OF REGISTRATION & DLUM POSITION
AUTO ADJUSTMENT OF REGISTRATION & DLUM POSITION