Spf/Rspf Scan Position Automatic Adjustment - Sharp AL-2020 Service Manual

2) Print start position (Duplex back surface) (SPF/RSPF) 50-19
(PHOTO)
The size (length) of a document read from the SPF/RSPF 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 quantity
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/RSPF) 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.
Document guide
3) Using the user simulation [18], set the paper size of the first
cassette.
• Letter paper: 4
• A4 paper: 3
4) Execute SIM 50-19 to turn on the TEXT lamp (or PRINT mode
lamp for the AL-2050/2060) and make the printing mode in OC-
D mode.
Make a copy of the test chart to check the void area of the scale
on the image.
Void position to be check
Paper
The trailing edge void on the first printing surface
is shown above.
Adjust the setting so that the void area is 4 - 5 mm. An increase in
1 of setting represents 0.1 mm in void area.
(2) Print start position (Duplex back surface)
1) Set the test chart so that the scale is positioned as shown
below.
The trailing edge has a scale
Table glass
Scale (S-D mode)
AL-2020/2035/2040/2050/2060 ADJUSTMENTS 9 - 7
2) Execute SIM 50-19 to turn on the PHOTO lamp (or SCAN mode
lamp for the AL-2050/2060) and make the printing mode in the
S-D mode.
3) Remove and reinsert the cassette.
Note: Make sure to carry out this step before making a copy dur-
ing this adjustment.
4) Make a copy and check the void area of the scale on the
image.
Adjust the setting so that the void area is 2 - 4 mm. An
increase of 1 in setting represents an increase of 0.1 mm in
void area.
Void position to be checked
5. SPF/RSPF scan position automatic
adjustment
Place a A4 paper (white chart) so that it covers the SPF scan glass
and the OC glass together, and close the SPF/RSPF.
When simulation 53-08 is executed, the current adjustment value is
displayed as the initial display.
* Default is 1. Adjustment range is 1 – 99. Adjustment unit 1 =
about 0.127mm
* If the values are kept as the default values, SPF/RSPF scan is
not performed properly. The front area of the proper scan position
may be scanned.
In case of AUTO, press [START] key, and the mirror unit scans from
the home position to the SPF/RSPF scan position with the adjust-
ment value displayed. The SPF glass cover edge position is calcu-
lated from the difference between the SPF glass cover edge and
the OC side document glass CCD output level. If the adjustment is
normal, the adjusted value is displayed. If abnormal, the error LED
lights up with the current set value displayed.
During the error LED is lighted, when [START] key is pressed again,
execution is performed again.
Display
Mode Default
item
SPF/RSPF scan AUTO
position auto
adjustment
SPF/RSPF scan MANU
position manual
adjustment
Operation
The operation is similar to simulation 46-01. (In MANUAL)
OK/ERR display in AUTO (AL-2050/2060)
<When OK>
53-08 SPF AUTO
AUTO 100% ** OK
LED
1 AE mode lamp (AL-2035/2040)
COPY mode lamp
(AL-2050/2060)
1 TEXT mode lamp
(AL-2035/2040)
PRINT mode lamp
(AL-2050/2060)
<When ERR>
53-08 SPF AUTO
AUTO 100% ** ERR
6cm or more is required.