Sharp AR-M350U Service Manual page 139

E. Vertical (sub scanning direction) distortion
adjustment [Winding pulley position adjustment]
This adjustment is executed in the following cases:
•When the mirror base drive wire is replaced.
•When the lamp unit, or No. 2/3 mirror holder is replaced.
•When a copy shown below is made.
La
Paper
exit
direction
Original
1) Set A3 white paper on the original table as shown below.
2) With the original cover open, make a normal (X 1.0) copy.
3) Measure the black distance at the lead edge and the rear edge of the
copy paper.
Paper exit direction
La : Lead edge black background section
Lb : Rear edge black background section
If La = Lb, the procedures 4) through 7) are not required.
4) Loosen the fixing screw of the front or the rear frame mirror base
drive pulley.
•If La < Lb, turn the rear frame mirror base drive pulley in direction B.
(Do not move the mirror base drive pulley shaft.)
•If La > Lb, turn the rear frame mirror base drive pulley in direction A.
(Do not move the mirror base drive pulley shaft.)
Front side
Lb
Copy
Rear side
A
B
Adjust screw
AR-M350 ADJUSTMENTS 9-5
5) Tighten the fixing screw of the mirror base drive pulley.
6) Perform procedures 1) through 3).
7) If La is not equal to Lb, perform procedures 4) and 5).
If La = Lb, the adjustment is completed.
Repeat procedures 1) through 6) until La = Lb.
F. Height adjustment of original detection light
emitting unit
1) Execute SIM 41-3.
2) Open the original cover. Press the original detection light-emitting
unit gradually with your finger to check the height at which OCSW
display on the LCD is highlighted.
32±0.5mm
3) Open the original detection light-emitting unit gradually to check the
height at which OCSW display turns to the normal state.
4) If the heights are out of the specified range in procedures 2) and 3),
adjust the height of the original detection light emitting unit by shifting
the adjustment screw.
SIMULATION 41-3
PD SENSOR DATA DISPLAY.
OCSW
PD1[128]: 200 PD2[128]: 200
PD3[128]: 50 PD4[128]:
PD5[128]: 51 PD6[128]:
PD7[128]: 52
5) After completion of adjustment, press the original detection light
emitting unit fully downward with your finger and release it. Check
that the original detection light-emitting unit moves up smoothly.
<Specification>
Specification
Original size 32±0.5mm
detection position
G. Orignal size detection photo sensor check
1) Execute SIM 41-1.
2) Put A3 (or WLT) paper on the table glass, and check that all the
sensor displays (except for OCSW) on the LCD are highlighted.
3) Gradually move the unit to the left, and check that the highlighted
sensor displays turn off one by one sequentially.
SIMULATION 41-1
PD SENSOR CHECK..
OCSW PD1 PD2 PD3 PD4
(The detected sensors are highlighted.)
52
50
Adjustment position
Height adjustment screw SIM 41-3
PD5 PD6 PD7