Read Sharp AR-C270 (serv.man10) Service Manual online
1) Place a scale on the original table as shown below.
Note that the scale must be placed in parallel with the scanning di-
rection and that the scale lead edge must be in close contact with
the original guide plate.
rection and that the scale lead edge must be in close contact with
the original guide plate.
2) Enter SIM 50-2.
3) Set IMAGE LOSS and DEN-A to "20".
4) Set all the set items of L1 and L2 to "0".
5) Make a copy at 400%. (Original table mode)
6) Measure the copied image dimensions X and Y.
X: Distance between the copy image lead edge and the scale of
10mm
Y: Distance between the paper lead edge and the copy image
lead edge.
7) Multiply X, Y, and Z by 10 to obtain L1, L2, and L3 respectively.
Enter the values of L1, L2, and L3.
L1 = X
×
10
L2 = Y
×
10
8) Cancel the simulation, make a copy, and check that the lead
edge image loss and void area are within the specified range
shown below.
shown below.
Lead edge image loss: 4.0
±
1.0mm
Lead edge void area: 4.0
±
1.0mm
If the above specifications are not satisfied, perform the following pro-
cedures.
cedures.
9) Enter SIM 50-1.
10) Set a scale in the same manner as procedure 3), and make a
copy at 50% and at 400% in the original table mode.
11) Measure the distance between the paper lead edge and the
copy image lead edge of 50% copy and of 400% copy.
12) Check that there is no difference between the above distance of
50% copy and that of 400% copy.
If there is a difference of 1.5mm or above, change the
adjustment value of RRC-A.
adjustment value of RRC-A.
Repeat procedures 10) to 12) until the above specification is satisfied.
13) If the lead edge void area is not within the specified range,
change the DEN-A value.
14) If the lead edge void area is not within the specified range,
change the IMAGE LOSS value.
15) If the rear edge void area is not within the specified range,
change the DEN-B value.
Adjustment
item
Adjustment
value
Note
IMAGE
LOSS
Lead edge
image loss
image loss
4.0
±
1.0mm
The greater the set value is,
the greater the image loss is.
the greater the image loss is.
DEN-A Lead edge
void area
4.0
±
1.0mm
The greater the set value is,
the greater the void area is.
the greater the void area is.
DEN-B Rear edge
void area
6.0
±
1.0mm
The greater the set value is,
the greater the void area is.
the greater the void area is.
10 20 30 40 50 60 70 80 90 50 100110120130140
10
20
30
40
50
X
Y
Paper lead
edge
edge
400% enlarged copy
Image loss
Lead edge void area
Lead edge void area
7 – 23
