Sharp SF-1014 Service Manual page 69

IV. Cases when the adjustment is required
1) When the optical section is disassembled or its part is
replaced (including the scanner home position sensor).
2) When the main PWB is replaced.
3) When the RAM in the main PWB is replaced.
4) When "U2" trouble occurs.
5) When the resist roller unit is disassembled or replaced.
6) When the blank lamp is replaced.
V. Necessary tools
* Screwdriver
* Scale
* Test chart
(Copy image position adjustment)
1) Execute simulations 45-1. (C → 0→ 0 → 45 → CB → 1 →
CB)
Simulations 45 is to adjust the size of the void area in the
lead edge of the copy paper.
The set adjustment value is displayed on the COPIES
SELECTED display.
2) Set the set value of simulations 45-1 to "0."
Enter "0" with the numeric key and press PRINT button.
3) Execute simulations 50-1. (C → 0 → 0 → C → 50 → CB →
1 → CB)
This simulation adjusts the copy image position for the
paper. One of the set adjustment values is displayed on the
COPIES SELECTED display.
Adjustment value A: Corresponds to the time interval from
Adjustment value B: Corresponds to the time interval from
the scanner unit starting and the
scanner home position sensor OFF to
reaching at the lead edge of the
document. That is, this is the value
used to determine the optical docu-
ment lead edge reference position,
and it must be fit with the edge sec-
tion of the document reference plate.
If this value is improper, when the
copy magnification ratio is changed,
the copy image lead edge position for
the copy paper edge will fluctuate.
(Does not exist in the models which
have no zoom copy functions.)
the scanner unit starting and the
scanner home position sensor OFF to
the resist roller ON.
According to this value, the paper
feed timing for the image on the
photoconductor drum is changed and
the copy image position on the copy
paper is also changed.
When the set value is changed by
"1," the position of the copy image on
the copy paper is changed by about
0.123 mm.
When the set value is made greater,
the copy image position for the copy
paper moves backward. When the
set value is made greater, the copy
image position for the copy paper
moves forward.
Use the paper tray select key to select the display of adjust-
ment value A, adjustment value B, and to select the set
mode.
Display lamp
Copier tray cassette paper feed
lamp ON.
Copier tray cassette paper feed
lamp BLINKS.
4) Set adjustment value A, adjustment value B to "0."
Enter "0" with the numeric key and press PRINT button.
5) Press the scale onto the document alignment plate and set
it horizontally as shown below:
6) Execute simulations 50-1 to make several copies at each of
129% and 64%.
Scale
7) Measure the distance from the paper lead edge to the copy
image lead edge of each copied papers, and calculate the
average value.
L1: Average distance (mm) from 129% copied paper lead
edge to the copy image lead edge
L2: Average distance (mm) from 64% copied paper lead
edge to the copy image lead edge
L1
Scale image lead edge
Enlargement copy (x 1.54)
7 – 19
Display content/set mode
Adjustment value A
Adjustment value B
mm
10 2 0 3 0
1/2mm