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[11] Copy quality adjustments
The copy quality must be adjusted for any of the following
conditions:
At the time of maintenance.
After the drum current adjustments, after the coronas
are replaced, after the corona wires are replaced, or after
a high voltage unit is replaced.
After replacing the CL-Reg PWB unit or its components.
After adjusting the VR on the CL-Reg PWB.
After replacing the auto exposure sensor (AE).
After replacing the copy lamp.
After replacing, adjusting, troubleshooting, or disassem-
bly of the dark box unit.
After adjusting the exposure control plate.
Adjustment procedure
®
2)
Clean
the optical
system
(table glass, lens, mirrors,
copy lamp, and reflector).
Remove the auto exposure sensor (see page [8]-1, 12)
and clean the surface of the photosensor with a cloth
dampened with alcohol.
NOTE:
Wiping with a dry cloth will impart an elec-
trostatic charge to the sensor and will attract
more dust.
Slide the drum sensitivity switch (DS-SW) to a position
that matches first digit of the drum grade number.
@ Make an all half tone copy on as (10 x 14", or B4)
paper in the manual
feed mode at 1:1. Check for an
even
front to rear exposure.
If the copy is uneven,
adjust exposure control plates (see page [8] -5).
@® Set the auto exposure
control
switch to the ''N"
position.
NOTE:
The switch is set to ''N" position when a new
drum is installed. Otherwise, no switch change
is required.
@® Make a copy of the Test Chart (UKOG-0089CSZZ).
Set the manual
exposure mode to 5.0 in the normal
(1:1) mode. Adjust the VR201
on the CL-Reg PWB so
that the 0.5 strip is slightly copied. (KODAK gray scale:
4.0 strip)
Switch cover
Auto exposure control switch
SF-7200
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Sy 2 Lees
ey
a
Make a copy of the gray scale with the manual expo-
sure mode set to 2.0 in the 1:1 mode.
Change to the auto exposure mode.
Place
four
sheets
of blank
white
paper,
120mm
x
360mm
on top of one another,
in alignment to the
original
set position on the original table. Place the
gray scale as shown below.
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Place two sheets of blank white paper
(B4 paper in two fold).
@® Make
a copy
and
adjust
the
automatic
exposure
control VR202) to make the copy equal in density to
the copy obtained in step 9.
NOTE:
Adjusting
the
manual
exposure
controls
(VR201, VR203, or VR204) changes the auto
exposure. Always perform
the manual expo-
sure
control
adjustment
first, then
perform
the automatic exposure control.
11-1
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