1-5
E.
BASIC IMAGE ADJUSTMENT PROCEDURE
Figure 1-1
Pre-check
Adjusting side-to side
density
Adjusting the density
Clean the corona wires.
Make the following copies
(using test sheet NA-2 or
NB-3)
Copy density 5: 2 copies
Copy density 1: 1 copy
Check the following :
1. Differences in density
between the near and
far sides of the copies.
2. Density of gray scale
No. 10.
3. Fogging in blank areas.
Adjust Service mode ( ).
(See p. 2-1.)
Return copy density
to 5.
Replace the grid plate and
grid mounting panel.
Check for stains on the
scanning lamp, reflector
plate, and mirror; clean
them if necessary.
Is the top
margin of the copy
at copy density 1 within
the standard?
Make one copy.
YES
NO
Replace the drum unit.
Make one copy.
Mount the drum unit
and make one copy.
Is there a
difference in density
in the image area of a
reduced copy?
NO
NO
Is there a
difference in density
on the near and far sides
of the copies?
Is the
distance bet-
ween the primary
corona grid and the photo-
sensitive drum
correct?
NO
YES
YES
(Note 1)
YES
Turn the copy density knob
clockwise. (Note 2)
(The image will become
lighter.)
Turn the copy density knob
counterclockwise. (Note 3)
(The image will become
darker.)
Is the
density of gray
scale No. 10 too dark?
(See Note 3.)
YES
Is the
density of gray
scale No. 10 correct?
(See Note 3.)
NO
NO
(See Note 4.)
YES
End.
Image adjustment should be per-
formed using the following settings:
1. Manual (non AE) exposure
2. Density cursor setting : 5
3. DIRECT reproduction ratio
Adjust the image by the following
procedure when the photosen-
sitive drum has been replaced.
Make this adjustment with the
upper front panel and front door
installed.
Note 1 :
The distance between the grid and
photosensitive drum is determined by
the spacer mounted on the grid.
Check for deterioration or damage to
the spacer.
This changes the developing bias, but
not the intensity of the scanning
lamp.
Note 2 :
No. 10 on the gray scale of a copy
should reproduce the density of No. 8
on the gray scale of the test sheet,
and no fogging in the background
should be visible.
Note 3 :
Turning the copy density knob clock-
wise too far past the proper position
will result in fogging in blank areas.
Note 4 :
