Automatic Black Level Correction - Sharp AR-203E 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 PRINT mode lamp 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)
AR-203E/5420/M200/M201 ADJUSTMENTS 9 - 7
2) Execute SIM 50-19 to turn on the SCAN mode lamp 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 during
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. Automatic black level correction

a. Cases when the adjustment is required
1) When the main PWB is replaced.
2) When the EEPROM in the main PWB is replaced.
3) When "U2" trouble occurs.
4) When repairing or replacing the optical section.
b. Adjustment procedure
Used to acquire the black level target value used for the black level
adjustment of white balance.
When SIM 63-02 is executed, the current correction value is dis-
played in 3 digits of 12bit hexadecimal number.
Place the gray gradation chart (UKOG-0162FCZZ) used as the
correction document so that the density 10 (black side) comes on
the left side and that the chart is upside down at the center of the
plate left center.
10
Chart back surface
When [START] key is pressed, the mirror base unit scans the chart
and calculates the correction value.
After completion of correction, the corrected value is displayed on
the display section.
∗
Default: 0
∗
If the value is set to the default, operation is made with 0x60.
AR-M200/M201
c. Operation
1) Initial display
63-02 BLACK LEVEL
0
2) [OK]/[ENTER]/[START] key: Correction start
63-02 BLACK LEVEL
EXECUTING...
<During canceling - When [Clear]/[Clear All] key is pressed->
After canceling, the machine goes into the sub code entry standby
mode.
THE JOB IS BEING
CANCELED.
3) After execution
63-02 BLACK LEVEL
*** OK
3) In case of an error
63-02 BLACK LEVEL
*** ERR