Sharp MX-C250 Service Manual page 57

To execute this adjustment, it is required that the ADJ 17A Scan
image off-center adjustment (Document table mode) must have
been properly adjusted.
1) Prepare the adjustment chart.
Draw a line at the center of the front surface and the back sur-
face of A4 (11" x 8.5") paper in parallel with the paper transport
direction.
Front surface
Draw a line at the center of the
front surface and the back surface
of paper in parallel with the paper
transport direction.
2) Set the adjustment chart to the RSPF.
3) Make a duplex copy in the normal magnification ratio from the
manual paper feed tray, and check the image position on the
front surface and the back surface of the copy paper.
original
a
b
If the difference is within the range of 0 +/- 2.7mmm there is no
need to perform the adjustment.
If the adjustment is required, perform the following procedures.
4) Enter the SIM 50-12 mode.
Sim50-12 ORG. OFFSET
1 OC
2 SPF(SIDE1)
[ 1- 99]
SIM50-12
Item Display
Document table image off-
1 OC
center adjustment
SPF(FRONT SPF front surface image off-
2
) center adjustment
SPF back surface image off-
3 SPF(REAR)
center adjustment
Paper transport direction
Back surface
copy
50
50
50
Set-
Default
Content ting
value
range
1 - 99 50
1 - 99 50
1 - 99 50
MX-C250 ADJUSTMENTS 5 – 23
A - C: When the adjustment value is increased, the image
position is shifted to the rear frame side.
1step = 0.1mm
SPF
Item/Display
Front surface docu-
1 SIDE1 ment scan position
adjustment (CIS)
Front surface lead
LEAD_EDGE
2 edge image loss
(SIDE1)
amount setting
Image
loss Front surface side
FRONT_REAR
3 amount image loss amount
(SIDE1)
setting setting
SIDE1
Front surface rear
TRAIL_EDGE
4 edge image loss
(SIDE1)
amount setting
* Item A, B: When the adjustment value is increased, the scan
timing is delayed.
* Item C - H: When the adjustment value is increased, the
image loss is increased.
* Item A - H: 1 step = 0.1mm change
* The SPF rear edge image loss setting is provided for
countermeasures against the case when shades are
produced.
5) Enter an adjustment value with 10-key, and press [OK] key.
(Change for change in the adjustment value: 0.1mm/step)
(When the adjustment value is increased, the print image is
shifted to the rear.)
Repeat the procedures of 2) - 6) until a satisfactory result is
obtained.
ADJ 8
Copy image position and image
loss adjustment
(Manual adjustment)
Only when the manual adjustment is required, execute this adjust-
ment.
8-A Copy image position, image loss, and void
area adjustment (Manual adjustment)
(Document table mode)
This adjustment must be performed in the following cases:
* When the scanner (reading) section is disassembled.
* When the scanner (reading) unit is replaced.
* When the LSU is replaced or removed.
* When the registration roller section is disassembled.
* U2 trouble has occurred.
* The MFP PWB has been replaced.
* When the EEPROM on the MFP PWB is replaced.
Before executing this adjustment, be sure to confirm that the ADJ
4/ADJ 5 Print engine image skew, image position, image magnifica-
tion ratio, void area adjustments has been completed normally.
1) Place a scale on the document table as shown in the figure
below.
Place a scale so that it is in parallel with the scanning direction
and that its lead edge is in contact with the document guide
plate.
Place white paper on the document table so that the scale lead
edge can be seen.
Setting Default
Content
range value
1 - 99 50
0 - 99 20
0 - 99 20
0 - 99 30