Sharp AR-651 (serv.man4) Service Manual ▷ View online
3 - 27
AR-651/810 ADJUSTMENT
(3) Winding the wire around the pulleys
Wind the wire around the wire pulley:
a. Put the ø3 ball terminal located at the center of the wire into a hole on the wire pulley. One end of the
wire with a hook attached comes to the outside.
b. Wind the wires around the wire pulleys of the front and rear sides. The number of turns to be wound are
as follows:
· 2 turns toward the opposite side of the boss
· 5 turns toward the boss side
Note:
Pay attention to the following when the wires are wound around the pulleys:
·
Do not twist the wire.
·
Wind the wires tightly so that they are in complete contact with the surface of the pulleys.
·
Each turn should be pushed against the previously wound turn so that there is no space
between them.
Hook
Hook
No space between turns
Ball terminal
Ball terminal
2 turns
2 turns
5 turns
5 turns
Silver
Black
AR-651/810 ADJUSTMENT
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c. After winding the wires around the pulleys, attach the wire holder jigs not to loosen the wires.
Notes: 1. When the wire holder jig is attached, make sure that the wire is not shifted or loosened.
2. The wire should come out of the slot of the wire holder jig and be passed under the arm of it.
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AR-651/810 ADJUSTMENT
3. 6. 2. Lens unit
(1) Replacment of the lens unit
· Since the lens unit is precisely adjusted at the factory, it must not be readjusted in the field and some
of the components cannot be replaced. If any of the components is defective, replace the whole unit.
· When the unit is replaced with a new one, do not loosen or remove the 8 screws indicated with the
arrows.
· Handle the unit with care. Do not hold the lens and adjusted part (hold the unit as shown below).
Front side
Rear side
Do not hold the lens
and adjusted part.
and adjusted part.
AR-651/810 ADJUSTMENT
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(2) Adjustment of the magnification ratio of the lens
Notes: 1. Perform magnification ratio adjustment of the
lens only when the lens unit has been
removed or is to be replaced.
2. Before making this adjustment, check that
the primary scanning reproduction ratio of
the printer is correct.
Feeding direction
Copied ruler
Actual ruler
a. Place a ruler on the original glass and make a copy on a A4/LT-sized paper at a 100% reproduction
ratio.
b.
Compare the copied ruler with the actual ruler to see the difference in size.
c. Make adjustment following the procedure below, so as to make the distance between each mark on the
rulers match.
Note: After this adjustment is finished, be sure to perform the “deviation adjustment of the scanner primary
scanning start position”.
<Adjustment procedure>
1. Remove the original glass and lens cover.
2. Screw the two pins for the lens magnification adjustment to the long hole at the lens base.
3. Loosen the 2 screws fixing the lens unit.
Adjustment pin
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