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