Mega FP?8000 XL Instruction Manual - page 25
a) if overall dimension in drum circumference direction is wrong linearly (all or almost all grids in this
direction are little bit smaller or bigger), change Drum Diameter in Run_photo_USB program under
Setup‐Setup Table. If dimension is smaller, decrease diameter value, if dimension is bigger, increase
drum diameter. To estimate correct drum diameter use the following formula: multiply current drum
diameter with ratio of measured distance on 300mm and 300 (or any other distance). For example,
measured distance in drum circumference on 300 mm grid is 300.1, while current drum diameter is
157.45. New drum diameter will be 300.1/300 multiplied by 157.45 = 157.50 Please note that this drum
diameter is not real drum diameter, but little bit bigger, depending on film size.
b) If overall dimension in drum axis direction is wrong linearly, change Screw Error value in Setup Table.
The value represents an error in dimension for 300 mm measured from 0 in drum axis direction. For
example value –0.05 means that overall dimension is 0.05mm shorter for 300 mm (measured dimension
for 300 mm is 299.95).
c) If there are errors only in certain areas along the drum circumference direction, enter measured
differences in Drum Linearity table for every particular grid where error appears.
d) If there are errors only in certain areas along the drum axis (screw) direction, enter measured
differences in Screw Linearity table for every particular grid where error appears.
e) If lines drawn horizontally (in drum axis direction) are not perpendicular to lines in vertical direction
(drum circumference direction), measure the difference between ideal horizontal line and drawn
horizontal line at 300 mm distance from 0 and enter this value as Angle Error.
7. Photoplotter Maintenance
There are no serviceable parts inside photoplotter. Keep drum clean and protect inner space of the plotter
from falling objects. Keep the lid closed at all times except loading and unloading film. Use basic cleaning
chemicals and soft cloth to clean drum surface from sticky areas left behind by masking tape.
Note
: If you need to open the plotter, remove all screws and carefully lift the upper part of the case just
above the plotter and move it backwards – there are wires between this upper case and the bottom part of
the plotter.
Photoplotter should be kept in dry place at room temperature (around 20 degrees Celsius).
Note
: Do not rotate drum by hand fast, as attached stepper motor generates then power that can damage
photoplotter electronic circuitry.