Spf/Rspf Mode Sub Scanning Direction Magnification Ratio Adjustment; Automatic Black Level Correction - Sharp AL-2020 Service Manual

6. SPF/RSPF mode sub scanning
direction magnification ratio
adjustment
Note: Before performing this adjustment, be sure to check that the
OC mode adjustment in copying has been completed.
1) Put a scale on the original table as shown below, and make a
normal copy (100%) on the front and the back surfaces to
make a test chart.
Note: Since the printed copy is used as a test chart, put the scale
in paralled with the edge lines.
2) Set the test chart on the SPF and make a copy in the normal
ratio (100%). (AL-2035/2040)
Set the test chart on the RSPF and make a duplex copy (D-D or
D-S) in the normal ratio (100%). (AL-2050/2060)
3) Compare the scale image and the actual image.
If necessary, perform the following adjustment procedures.
4) Execute SIM 48-05.
5) The current sub scanning direction magnification ratio correc-
tion value is displayed in two digits on the display section.
6) Enter the set value and press the [START] key.
When adjusting the RSPF, use [2-SIDED COPY] key to select
single/duplex after entering the one page print mode, perform-
ing 2-page single copy.
Display item
Mode (AL-2050/
2060)
Sub scan magnification SIDE1
ratio adjustment on the
surface of SPF/RSPF
document
Sub scan magnification SIDE2
ratio adjustment on the
surface of RSPF
document (AL-2050/
2060)
∗
When there is no document in SPF/RSPF, copy is inhibited.
<Adjustment specification>
Adjustment mode Spec value
Sub scanning At normal:
direction ±1.0%
magnification ratio
(SPF/RSPF mode)
Default LED
50 AE mode lamp
(AL-2035/2040)
COPY mode lamp
(AL-2050/2060)
50 PRINT mode lamp
Setting
SIM Set value
range
48-5 Add 1: 1 – 99
0.1% increase
Reduce 1:
0.1% decrease
AL-2020/2035/2040/2050/2060 ADJUSTMENTS 9 - 8

7. 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.
AL-2050/2060
c. Operation
1) Initial display
63-02 BLACK LEVEL
0
2) [OK]/[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