Minolta Di551 Service Manual page 350

4. LD1 offset adjustment
This adjusts the place at which LD1 laser starts
writing.
This adjustment should be performed when the
drum or developer is replaced. The adjustment is
performed at line speed of 320, 280 and 185
respectively.
Be sure the drum unit is set.
Auto maximum density adjustment and auto dot
diameter adjustment must have been com-
pleted.
Step Operation
Enter the 36 mode.
1
[Adjustment mode menu Screen]
2
Press " Process adjustment".
1
[Process adjustment mode menu
Screen]
3
Press " Drum peculiarity adjustment".
2
[Drum peculiarity adjustment mode
menu Screen]
4
Press " LD1 offset adjustment".
4
[LD1 offset adjustment Screen]
Press any key of
5
.
LS185
6
Press the
COPY SCREEN
Select A3 size paper and press the START
7
button to output the test pattern.
, , or
LS320 LS280
key.
2-53
Check the test pattern.
Specification: Check if two output pat-
terns from laser are consis-
tent and the beginning of
the lower density part is
aligned between the two
lines as illustrated below.
Reference line
8
LD1 LD2 LD1 LD2 LD1
If the specification is not satisfied, press the
9
C button while pressing the Utility button.
[LD1 offset adjustment Screen]
Enter an offset value using the numeric
10
keys and press the
SET
Setting range: -128 to +127
Repeat steps 6 to 10 until the specification
11
is satisfied.
Press the
RETURN
12
Drum peculiarity adjustment mode menu
Screen.
Reference:
Select to adjust in normal mode (line
LS320
speed 320 mm/sec.),
postcard mode (280 mm/sec.) (Japan only), or
to adjust in thick paper mode (185
LS185
mm/sec.).
ADJUSTMENT
LD2 LD1 LD2
key.
key to return to the
to adjust in
LS280