Minolta DI750 - SERVICE, Service Manual

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36 ADJUSTMENT
1 ADJUSTMENT
[4] Drum Characteristic Adjustment
(manual)
1. Maximum density manual adjustment
Maximum density manual adjustment should be
performed under the guidance of Minolta.
Adjustment range: 0 to 255
2. Dot diameter correction manual adjust-
ment
Dot diameter correction manual adjustment
should be performed under the guidance of
Minolta.
Adjustment range: 0 to 255
7. Auto Gamma Adjustment
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 adjustment,
auto dot diameter adjustment, LD1
offset adjustment, and LD2 offset
adjustment must have been com-
plete.
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.”
5 [Auto gamma adjustment Screen]
Press the
START
key.
The drum and developer operate to auto-
matically 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.
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.
[5] User Paper Setting
This adjustment is only performed when user uses
special copy paper and can not be adjusted using
the standatd adjustment process.
This setting is applied when “User” is selected for
“Paper type/Special size setting” in the key
operator mode or when “User paper” is selected
for “Transfer/separation corona unit output plain
paper” or “Recycled paper” in 25 mode DIPSW.
The data for “64 g/m
2
plain paper” are inputted as
the default.
Step Operation
1 Enter the 36 mode.
2 [36 Mode Menu Screen]
Press “
1
Process adjustment.”
3 [Process adjustment Screen]
Select “
4
User paper setting.”
4 Transfer/separation output screen ap-
pears.
Enter data according to the user specified
paper.
Data should be input under the guidance
of Minolta
Di750Ver.3field016e.p65 01/07/18, 17:42 57