Sharp AR-M450 Service Manual page 56

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. Original detection light emitting unit height
adjustment
1) Execute SIM 41-3.
2) Open the original cover, hold the original detection light emitting unit
gently, and select "1" and press START key without placing an
original.
32±0.5mm
3) Check that "COMPLETE" is displayed on the LCD, and press
CUSTOM SETTING key, and the screen returns to the original menu.
4) Place an A3 (or WLT) original on the table glass, and select "2" and
press START key.
When "COMPLETE" is displayed on the LCD, the adjustment has
been completed.
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 document detection light
emitting unit down with your fingers completely to the bottom, and
release it. Check that the document detection light-emitting unit
moves up smoothly.
<Specification>
Original size detection photo sensor
adjustment
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
Specification Adjustment
position
COMPLETE SIM 41-2
PD5 PD6 PD7