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January 2000 © TOSHIBA TEC 1 - 81 FC-22 ADJUSTMENT
(b) Adjusting the magnification ratio of the lens
Note:
1. The lens magnification ratio adjustment
should be performed only when the lens
unit is removed or replaced in the field.
2. Before this adjustment, check that the pri-
mary scanning reproduction ratio of the
printer is corrected.
Feeding direction
Copied ruler
Actual ruler
1. Place a suitable ruler on the original glass and make a copy of it on A4(LT)-size paper at 100%
reproduction ratio.
2. Compare the copied ruler with the actual ruler to measure the error in the reproduction ratio.
3. Make adjustment so that the distance between each mark of both rulers becomes equal, using the
following procedure.
Note:
After this adjustment, be sure to perform CCD primary scanning deviation adjustment.
<Adjustment procedure>
(1) Remove the original glass, lens cover, damp heater unit and lens shield bracket.
(2) Screw the 2 pins for lens magnification ratio adjustment into the 2 elongated holes in the lens base.
Lens base
Exit side
Pins for lens magnification ratio
adjustment
Feed side
(3) Loosen 2 screws for fixing the lens unit.