HP 7470A Operator's Manual page 37

Possible Cause
Plotter Seems
Climatic conditions have
changed.
Medium is unsuitable.
Writing Surface Is Rippled, Torn, or Scratched
Plotting medium is too thin.
Plotting medium is too thick.
Plotting medium is uneven.
Plotting medium is improperly
loaded.
32
Misregister or "Drift" (Continued)
to
Changes in temperature andl
or relative humidity during
the course of a plot can cause
media to stretch or shrink.
This change in dimension
may look like a misregistered
line. To avoid the effects of
environmental changes, let
the plotting medium acc\imate
to the room in which the
plotter
ning to plot.
Media that are too thick, too
thin, or
be gripped properly as they
move through the wheels.
Thin or tissue-like media do
not have the tensile strength
to move through the wheels.
Change to a heavier medium.
Change to a lighter medium.
It is possible that the medium
is warped or otherwise un·
even. If this defect is present,
it may cause the pen to tear or
scrape at the high places.
Check the medium carefully to
see if any surface aberrations
can be detected. If so, replace
the medium.
Reload the sheet. Make certain
the medium has square
corners and
paper stop.
Solution
is
located before begin·
slippery may not
too
is
against the