Minolta Di551 Service Manual page 353

ADJUSTMENT
9. Auto gamma adjustment (2 dot)
Performs gamma adjustment (2 dot) automatically.
This adjustment should be performed when the
drum, developer, write unit, or dust-proof glass is
replaced.
Preparation: Be sure the drum unit is set.
Auto maximum density adjust-
ment, auto dot diameter adjust-
ment, LD1 offset adjustment , LD2
offset adjustment, and auto
gamma adjustment (1 dot) must
have been completed.
Step
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 " Auto gamma adjustment
9
(2 dot)".
[Auto gamma adjustment (2 dot)
Screen]
Press the
Start
5
The drum and developer operate to auto-
matically adjust Gamma.
Adjustment completes in about 10 seconds
and an complete message is displayed.
Press the
RETURN
6
Drum peculiarity adjustment mode menu
Screen.
Reference:
If any one of the following error messages
appears during auto gamma adjustment,
clean the TSCB (toner control sensor board),
check its installation state, and retry the auto
gamma adjustment.
<1> Error 1: The γ sensor dirt correction has
been corrected.
<2> Error 2: No signal is output from the γ sen-
sor. No control patch is output.
<3> Error 3: A recurrence error occurred dur-
ing γ curve calculation.
Operation
key.
key to return to the
10. Cartridge set mode
This adjustment should be performed when
blank dots appears on the copy after the drum
removing and installing.
Step
Enter the 36 mode.
1
[Adjustment mode menu Screen]
2
Press "
1
[Process adjustment mode menu
Screen]
3
Press "
2
[Drum peculiarity adjustment mode
menu Screen]
4
Press "
10
[Cartridge set mode Screen]
5
Press the
The developing unit and the drum rotate for
two mintes, and return to Cartridge set
6
mode Screen.
7
Press the
Select the wide paper (ie A3, A4, 11x17,
8 8.5x11) in the direction of the drum shaft,
set 10 copies, and press START button.
If black dots still appear, press the C button
while pressing the Utility button to return to
9
the cartridge set mode, and repeat the step
5 to 8.
Press the C button while pressing Utility
10
button when black dots disappear.
Press
RETURN
11
peculiarity adjustment mode menu Screen.
2-56
Operation
Process adjustment".
Drum peculiarity adjustment".
Cartridge set mode".
key.
Start
key.
COPY SCREEN
key to return to the Drum