Sharp AR-405 (serv.man9) Service Manual ▷ View online
3) Change each value to adjust so that the void amounts of both
sides are even.
a > b: Increase the value.
a < b: Decrease the value. (See the figure below.)
4) Press the CA key to terminate the simulation.
(3) Laser power setting
*
Normally the laser power is automatically corrected by process
control. Use the image density adjustment described later unless
there is a special request from the user.
control. Use the image density adjustment described later unless
there is a special request from the user.
(AR-230/280/285/330/335 series copy mode)
All must be set to "16."
(AR-405)
Set all to "5" except for PH256.
C. Scanner section
(1) Vertical image distortion balance adjustment
(Copy lamp unit installing position adjustment)
1) Insert the front/rear mirror base drive wire into the frame groove
and press and fix it with the wire fixing plate. At that time, do not
tighten the wire fixing screw.
tighten the wire fixing screw.
Change the direction of the lamp portioning plate. (F and R)
2) Push the copy lamp unit onto the positioning plate, and tighten the
wire fixing screw.
AR-2XX/3XX series
AR-405
b
a
b
a
AR-405
7 – 7
1/21/1999
*
Note for assembling the copy lamp unit
Move the copy lamp unit to the paper exit side, and fix the copy lamp
unit wiht the harness guide so that the distance between the copy
lamp harness and the lower frame is about 25 ~ 30 mm with the copy
lamp harness extended.
unit wiht the harness guide so that the distance between the copy
lamp harness and the lower frame is about 25 ~ 30 mm with the copy
lamp harness extended.
Shift the copy lamp unit to the paper exit side, and fix it with the
harness guide so that the distance from the lower frame is about 24
harness guide so that the distance from the lower frame is about 24
±
2mm with the copy lamp harness extended.
After fixing, manually shift the copy lamp unit a few times to check
that it moves smoothly.
that it moves smoothly.
If the copy lamp harness is loosely fixed, the copy lamp unit may
jump up when reading, resulting in abnormal reading.
jump up when reading, resulting in abnormal reading.
AR-2XX/3XX series
AR-405
(2) Vertical image distortion balance adjustment
(No. 2/3 mirror base unit installing position
adjustment)
adjustment)
This adjustment is to adjust the parallelism of the mirror base to the
OPC drum surface and the original surface.
OPC drum surface and the original surface.
1) Manually turn the mirror base drive pulley to bring mirror base B
into contact with mirror base positioning plate.
If, at that time, the front frame side and the frame side of mirror
base B are brought into contact with the mirror base positioning
plate simultaneously, the parallelism is correct and there is no
need for adjustment.
base B are brought into contact with the mirror base positioning
plate simultaneously, the parallelism is correct and there is no
need for adjustment.
(3) 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.
24±2mm
25±30mm
Lb
La
Original
Paper exit
direction
direction
Copy
AR-405
1/21/1999
7 – 8
9) Remove the slide pin of the front cover unit.
10) Insert the slid pin as shown below and make positioning in the
vertical direction.
11) Insert the slide pin as shown below and make positioning in the
horizontal direction.
(Initial position positioning is completed.)
*
Never loosen the screws which are not indicated in the figure.
If loosened, the adjustment cannot be made and the unit must be
replaced.
If loosened, the adjustment cannot be made and the unit must be
replaced.
12) Make a sample copy in the initial position and measure the
magnification ration again.
13) Change the installing position in the horizontal direction to adjust
the magnification ratio.
•
When the copy image is longer than the original, move in
the direction of B.
the direction of B.
•
When the copy image is shorter than the original, move in
the direction of A.
the direction of A.
•
One scale of scribe line corresponds to 0.2%.
•
For fine errors which cannot be adjusted with this
adjustment, use the next simulation SIM 48-1.
adjustment, use the next simulation SIM 48-1.
Never loosen a screw other than these ones.
A
B
AR-335
7 – 11
1/21/1999
(6) Main/sub scanning direction magnification ratio
adjustment
1) Before this adjustment, perform the previous adjustment of CCD
unit installation position.
2) Place a scale on the original table as shown. (Scale a and scale b
may be placed together or individually.)
•
After warming up, the ready lamp lights up.
•
The current set value is displayed simultaneously. (0
∼
20)
3) Make a normal copy and obtain the main/sub scanning direction
magnification ratios.
Copy magnification ratio (MRCP)
=
(
Original dimension – Copy dimension
)
Original dimension
×
100%
4) Execute SIM 48-1.
5) Change value A so that the magnification ratio in the sub scanning
direction is within the specified range.
6) Change value B so that the magnification ratio in the main scan-
ning direction is within the specified range.
•
Adjustment specification: Within
±
0.8%
•
When the copy dimension is smaller than the original
↓
Make the value greater.
•
When the copy dimension is greater than the original
↓
Make the value smaller.
When the value is changed by one step, the ratio is changed
by about 0.1%.
by about 0.1%.
[AR-280 only]
7) Make a copy of A3 original with SPF, and measure the magnifica-
tion ratio in the sub scanning direction.
8) Change value C so that the magnification ratio in the sub scan-
ning direction is within the specified range.
9) Press the CA key to cancel the simulation.
(7) Copy image position, image loss, void area
adjustment
Before performing this adjustment, check that SIM 50-5 is set to 50. If
not, set it to 50.
not, set it to 50.
This adjustment uses SIM 50-2 and SIM 50-1.
The above two simulations are used in the following manner.
Sim 50-2:
Rough adjustment
SIM 50-1:
Fine adjustment
If the desired value is obtained by SIM 50-2, there is no need to
perform SIM 50-1.
perform SIM 50-1.
10
20
30
40
50
60
70
80
90
50
10
0
0
110
120
130
140
10
20
30 40 50 60 70
80 90
50 100 110 120 130 140
Scale a
Scale b
10
20
90
100
110
10
20
90
100
110
10
20
90
100
110
Scale
(Original)
(Original)
(Example 1)
Copy A
(Shorter than
the original)
Copy A
(Shorter than
the original)
(Example 2)
Copy B
(Longer than
the original)
Copy B
(Longer than
the original)
Paper exit direction
a > Magnification ration in the main scanning direction
b > Magnification ratio in the sub scanning direction
b > Magnification ratio in the sub scanning direction
AR-405
1/21/1999
7 – 12
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