Minolta Di551 Service Manual page 352

6. LD1 bias adjustment
LD1 bias adjustment is inhibited in the field.
7. LD1 bias adjustment
LD1 bias adjustment is inhibited in the field.
8. Auto gamma adjustment (1 dot)
Performs gamma adjustment (1 dot) automati-
cally.
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 and,
LD2 offset adjustment must have
been completed.
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 " Auto gamma adjustment
8
(1 dot)".
[Auto gamma adjustment (1 dot)
Screen]
Press the
Start
5
The drum and developer operate to auto-
matically adjust Gamma.
Adjustment completes in about 10 seconds
and a complete message is displayed.
Press the
RETURN
6
Drum peculiarity adjustment mode menu
Screen.
key.
key to return to the
2-55
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.
ADJUSTMENT