4. Duplex adjustment
A. Adjusting the paper reverse position in
memory for duplex copying
This step adjusts the front surface printing (odd-number pages of a
document set) in the S-D mode copying.
That is, it covers the adjustment of the second surface printing
mode (image loss at the front edge of an image) in which image
data is once stored in memory.
The image data is read, starting from its front end in the document
delivery direction (Reference direction of document setting in the
OC mode)and stored in memory.
This stored image data is printed starting at the printing start posi-
tion, in the order of last-stored data to the first-stored data.
In other words, the front edge image loss of the image can be
adjusted by changing the document read end position.
(Adjustment procedure)
1) Preparing test chart (Draw a scale at the rear end of one side
of a sheet of A4 white paper or letter paper)
2) Set the test chart so that the scale is positioned as shown
below, in the S-D mode.
3) Execute SIM 50-18 to make a copy and check the front edge
image loss at the area where the scale is printed.
Adjust the setting so that the front edge image loss is less than
4.0 mm in the SPF mode.
An increase of 1 in setting represents an increase of 0.1 mm in
image loss.
B. Adjusting trailing edge void in duplex copy
mode
This is the adjustment of the first surface printing mode (rear end
void) in duplex copying.
In a duplex copying operation, the paper is delivered starting from
the rear end of the first printing surface. It is therefore necessary to
make a void area at the rear end on the first printing surface to
prevent paper jam at the fusing part.
There are two adjustment modes:
1) Paper trailing edge void quantity 50-19 (TEXT)
This adjustment is made when the cassette paper size is rec-
ognized. The trailing edge void quantity can be adjusted by
changing the trailing edge image laser OFF timing.
2) Print start position (Duplex back surface) (SPF) 50-19 (PHOTO)
The size (length) of a document read from the SPF is
detected, the image at the trailing edge of the first printing sur-
face is cut to make a void area. (The adjustment of void quan-
tity at the time when the cassette paper size is not
recognized.)
The paper void quantity should be first adjusted before the image
cut trailing edge void quantity (SPF) is adjusted.
(Adjustment procedure)
(1) Paper trailing edge void quantity
1) Preparing test chart (Draw a scale at the rear end of one side
of a sheet of A/4 white paper or letter paper)
2) Set the test chart on the document glass as shown below.
3) Using the user simulation [18], set the paper size of the first
cassette.
• Letter paper: 4
• A4 paper: 3
5 10
Scale (S-D mode)
5 10
The front edge of the
scale on test chart
Front edge of paper
Void area
less than 4 mm
2nd printing surface where scale is printed (lower side)
Document guide
The trailing edge has a scale
Table glass
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