Sharp SF-2014 Service Manual page 80

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
mm. (Not required for the models without zoom functions.)
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 magnifi-
cation ratio.
LA
mm
10 20
1/2mm
Scale image lead edge
Enlargement copy (x 1.54)
LB
10 20 30
Scale image lead edge
Reduction copy (x 0.64)
1.0
LA-LB
=±1.0mm
30
50
40 60 70
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.
14) Set documents in the SPF, and make several copies at
100% with simulations 50-1.
15) Measure the distance from the paper led edge to the copy
image lead edge of each copy paper, and calculate the
average value.
L 3
Scale image lead edge
L3: Average distance (mm) from the copy paper lead edge
to the copy image lead edge (Only in the SPF models)
16) Substitute the average value obtained in procedure 15) for
L3 in the formula below to obtain adjustment value C.
C = 8.0906 x L3 (Only the SPF models)
17) Set the adjustment value obtained in procedure 16). (Only
the SPF models)
7 – 22
Copy scale image
mm
10 20 30
1/2mm
0±1.0mm
Paper lead edge
mm
1 0 2 0 30
1/2mm
Normal copy (100%)