Read Sharp MX-RP20 Service Manual online
MX-RP
20 N ADJUSTMENTS 4 – 2
10) Loosen the CCD unit fixing screws.
*
Never loosen the screws marked with X.
If any one of these screws is loosened, the position and the
angle of the CCD unit base may be changed to cause a
problem, which cannot be adjusted in the market. In that
case, the whole scanner unit must be replaced.
If any one of these screws is loosened, the position and the
angle of the CCD unit base may be changed to cause a
problem, which cannot be adjusted in the market. In that
case, the whole scanner unit must be replaced.
11) Slide the CCD unit in the arrow direction (CCD sub scanning
direction) to change the installing position.
When the copy image is longer than the original scale, shift the
CCD unit in the direction B. When the copy image is shorter
than the original scale, shift the CCD unit in the direction A.
CCD unit in the direction B. When the copy image is shorter
than the original scale, shift the CCD unit in the direction A.
One scale of mark-off line corresponds to 0.2%.
At that time, fix the CCD unit so that it is in parallel with the
scale on the front and the rear side of the CCD unit base.
scale on the front and the rear side of the CCD unit base.
* Fix the CCD unit so that it is in parallel with the line marked
in procedure 9).
12) Make a copy and check the copy magnification ratio again.
If the copy magnification ratio is not in the range of 100 +/-
0.8%, repeat the procedures of 9) - 11) until the condition is
satisfied.
0.8%, repeat the procedures of 9) - 11) until the condition is
satisfied.
NOTE: By changing the CCD unit fixing position with the simula-
tion 48-1 adjustment value at 50, the copy magnification
ratio is adjusted within the specified range (100 +/- 0.8%)
and the specified resolution is obtained based on the opti-
cal system structure.
ratio is adjusted within the specified range (100 +/- 0.8%)
and the specified resolution is obtained based on the opti-
cal system structure.
2. Main scanning direction image
magnification ratio adjustment (RSPF
mode)
This adjustment must be performed in the following cases:
* When the scan control PWB is replaced.
* When the EEPROM on the scan control PWB is replaced.
* When U2 trouble occurs.
* When the copy magnification ratio is not matched.
* When the DSPF/RSPF is disassembled.
a. Adjustment procedures
1)
Place the duplex adjustment chart shown below on the docu-
ment tray of the DSPF/RSPF. The adjustment chart is pre-
pared by the following procedures. Use A4 (11" x 8.5") paper,
and put marks on both sides and both surfaces of the paper at
10mm from each edge.
ment tray of the DSPF/RSPF. The adjustment chart is pre-
pared by the following procedures. Use A4 (11" x 8.5") paper,
and put marks on both sides and both surfaces of the paper at
10mm from each edge.
2)
Make a duplex copy at the normal ratio on A4 paper.
3)
Measure the images on the copy paper and the original
images.
images.
4)
Obtain the image magnification ratio according to the following
formula:
formula:
Image magnification ratio = Original size / Original size x 100
(%)
(%)
Image magnification ratio = 99 / 100 x 100 = 99 (%)
If the image magnification ratio is within the specified range
(100 +/- 0.8%), there is no need to perform the adjustment.
(100 +/- 0.8%), there is no need to perform the adjustment.
If it is not within the specified range, perform the following pro-
cedures.
cedures.
A
B
A4 size
(Both the front surface
and the back surface)
10mm
10mm
Paper pass direction
original
10
50
100
150
200
250
copy
10
50
100
150
200
250
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