Sharp SF-1014 Service Manual page 70

L 2
10 20 30
Scale image lead edge
Reduction copy (x 0.64)
8) Enter the measure values in procedure 7) into the formula
below to calculate adjustment value A and adjustment
value B.
A = 8.2423 x (L1 – L2)
B = 16.0568 x L2 – 7.9661 x L1
9) Set the adjustment values obtained in procedure 8).
10) Execute simulations 50-1 to make several copies at each of
129% and 64%.
11) Measure the distance from the paper lead edge to the copy
image lead edge of each copied papers (129% and 64%),
and calculate the average value.
12) Check that the difference between the distance from the
copy paper lead edge to the copy image lead edge of
129% copy and that of 64% copy is in the range of 0 ± 1.0
mm.
If the difference is out of the above range, change adjust-
ment value A and repeat procedures 10) and 12) until the
difference is within the above range.
If adjustment value A is improper, the copy image lead
edge position fluctuates in proportion to the copy mag-
nification ratio.
LA
mm
10 20
1/2mm
Scale image lead edge
Enlargement copy (x 1.54)
50
40 60 70
LA-LB
=±1.0mm
30
LB
Scale image lead edge
Reduction copy (x 0.64)
13) Make a 100% copy, and check that the copy image lead
edge is in the range of 0 ±1.5 mm from the paper lead edge
position reference.
If it is out of the above range, change adjustment value B
and repeat procedure 13) until it is within the above range.
mm
1/2mm
7 – 20
50
10 20 30 40 60 70
Copy scale image
10 20 30
0±1.0mm
Paper lead edge