Konica Minolta 7075/FORCE 75, Service Manual

Page: 404 / 844

1 - 72
36 ADJUSTMENT
Reference 1:
If any one of the following error messages
appears during auto gamma adjustment, clean
the TCSB (toner control sensor board), check its
installation state, and retry the auto gamma po
tential adjustment.
<1> Error 1:
The
γ
sensor dirt correction has been
corrected 10 or more times, but it does not
converge.
<2> Error 2:
No signal is output from the
γ
sensor. No
control patch is output.
<3> Error 3:
A recurrence error occurred during
γ
curve
calculation.
METHOD
REPLACEMENT
MODEL
7075/7085
MANUAL
SERVICE HANDBOOK
REVISED EDITION
3
DATE
Jan. 2002
PAGE
1-72
7. LD1 bias adjustment (7085 only)
LD1 bias adjustment is not performed in the field.
8. LD2 bias adjustment (7085 only)
LD2 bias adjustment is not performed in the field.
9. LD sub-pitch offset adjustment (7085 only)
LD sub-pitch offset adjustment is not performed
in the field.
3
10. Auto Gamma Adjustment (1 dot)
Performing gamma adjustment 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 and
auto drum potential adjustment,
auto maximum density adjust-
ment, auto dot diameter adjust-
ment, LD1 offset adjustment, and
LD2 offset adjustment must have
been complete.
Step Operation
1 Enter the 36 mode.
2 [36 Mode Menu Screen]
Press “
1
Process adjustment.”
3 [Process adjustment Screen]
Press “
2
Drum peculiarity adjustment.”
4 [Drum peculiarity adjustment mode
menu Screen]
Press
7
Auto gamma adjustment.”
(7075)
Press “
10
Auto gamma adjustment (1
dot).” (7085)
5 [Auto gamma adjustment Screen]
Press the
START
key.
The drum and developer operate to au-
tomatically adjust Gamma.
Adjustment completes in about 20 sec-
onds and an end message is displayed.
6 Press the
PREVIOUS SCREEN
key to re-
turn to the Process adjustment Screen.
3