Sharp MX-4100N Service Manual page 78

13-C DSPF levelness adjustment
This adjustment is needed in the following situations:
* The DSPF section has been disassembled.
* The DSPF unit has been replaced.
1) Close the DSPF unit and check the clearance between the
projections in the front side and the rear side and the SPF
glass holding resin surface.
2) Visually check to insure that the clearance A is 1mm or less
and the clearance B is 0mm (in contact).
1mm
A
0mm
If the above requirement is not met, do step 3.
3) Turn the height adjustment screw to adjust the DSPF front/rear
frame horizontal level.
R
When the front frame side is higher (there is a clearance in B):
Turn the height adjustment screw R of the DSPF rear frame
clockwise.
When the rear frame side is higher (clearance A is more than
1mm): Turn the height adjustment screw L of the DSPF rear
frame counterclockwise.
Repeat steps 2 to 3 until an acceptable result is obtained.
B
L
MX-5001N ADJUSTMENTS 5 – 36
4) After adjustments of A and B, check to insure that the projec-
tion on the front right side is in contact with the glass surface of
the main unit.
13-D DSPF skew adjustment
(Front surface mode)
This adjustment is needed in the following situations:
* The DSPF section has been disassembled.
* When replacing the DSPF unit.
* The DSPF unit generates skewed scanned images.
1) Create an adjustment chart by printing in duplex mode the self-
print pattern 1 (grid pattern) specified in Simulation 64-1.
Make sure that the print grid pattern is almost in parallel with
the paper edges, and apply position marks 'A', 'B', 'C' and 'D' to
the leading and trailing edges of the paper for both front and
back sides of the paper.
A
2) Copy the adjustment chart (created in step 1) to A3 (11" x 17")
paper in DSPF duplex mode, and then check the image for
skews (Set in the DSPF feed tray so that the mark on the
adjustment chart is at the edge).
• Check with one of the following methods.
[Check Method 1]
(Front side)
Make sure that the output satisfies the condition: |a-b| ± 1 mm
A
a
(Back side)
Make sure that the output satisfies the condition: |c-d| ± 1 mm
C
c
Paper pass direction
B
B
b
D
d