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(5) Adjustment of the Aperture Blades
@ Requirement
© There should be no dark or light bands running in the feeding direction on copies produced. (Adjust to
obtain the mean irnage density for all areas.)
@ Important
ef dark and light bands running in the feeding direction occur on copies, make this adjustment after
checking following.
1) The surfaces of the Mirror and Lens are free of dirt.
2) The surfaces of the Exposure Lamp and Main Erase Lamp free of scratches and dirt.
1.
Make copies in the following modes.
Original
+ A4 or 8-1/2" x 14"
Paper
: A4 or 8-1/2" x 14"
Magnification ratio : 100 %
Exposure
:Manual
.
(setting convenient for check)
2.
Remove the Original Glass.
3.
Turn the copy on the Copy Tray Around as shown to re-
verse the leading and trailing edges and align it with the
Aperture Blades.
4.
Adjustto obtain the mean image density for all areas of the
oopy,
NOTE
To make the image darker, move the Aperture Blade to-
ward the Auxiliary Reflector.
To make the lighter darker, move the Aperture Blade away
from the Auxiliary Reflector.
1159D138AA
D-48
(6) Adjustment of Zoom Ratio in the Crosswise Direction
(EP1031/EP1031F Only)
@ Requirement
© This adjustment is made for the Zoom ratio in the crosswise direction.
A scale is placed on the Original Glass to run parallel with the scanner and the length of the scale on
the copy is compared with that of the actual scale. The adjustment must be made so that the difference
between the two dimensions falls within the following specifications.
The difference should be within + 0.5 % of the actual length.
Against 200mm, allowance is 200 mm x 0.005 = 1.0 mm
Zoom Ratio
Specifications
Adjusting Mode
Satting Range
Full size (x 1.000) | 220
1.0mm | AdiustAt=Lens
Full
33 to 67
ry Important
This adjustment must be made before the "Reference Position Adjustment".
1.
Place a scale in parallel with the Original Width Scais and
make a copy.
* Make a one copy using Ad or 8-1/2" x 14" paper at a 1:1
zoom ratio.
"tf the scale is of plastic and transparent, place a blank
sheet of paper on it.
1159D138AA
2.
Measure the crosswise zoom ratio of the sample copy.
Measure the length of the scale on the copy with the actual
scale to determine if there is any deviation.
* Ifthe zoom ratio deviates from the specifications, go to the
next stap.
1134D124AA
D-49
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