HP 7475a, Operation And Interconnection Manual

Page: 82 / 101

Fiber-tip pens will last at least 30 days stored in the carousel. However,
if you do not plan to plot for several days, remove the pens from the
carousel and cap them to ensure a longer pen
life.
Remove drafting pens and cap them immediately after use to prevent
drying and clogging. Drafting pens require cleaning after each use.
Remember that ink dries as quickly in the drafting pen
as
it does on
the plotting media. Here are the maximum times that ink can remain
in a drafting pen in an average environment.
•
20 seconds if the pen
is
uncapped and not in use.
•
One day
if
the pen is in a drafting pen carousel.
•
One week if the pen
is
properly capped and stored in a honwntal
position.
Symptoms and Solutions
Drafting pens provide the highest quality lines available on the plotter.
If you are not getting the quality of output you desire, consult the
following table. It
will
help you diagnose and correct output problems.
Symptoms and Solutions
Problem Possible Cause
Pen does not Pen
is
clogged.
write.
Cleaning wire
is
bent.
Beginning of a Ink
is
starting to
line does not
dry in the tip.
show.
Pen skips or
Pen is partially
drags. blocked.
There is oil on the
medium.
Pen tip clogs
Tip is worn out.
frequently.
Point is too fine.
4-2
SELECTING PENS AND MEDIA
Solution
Clean the pen.
Replaoe the point.
Before plotting,
draw lines by
hand, dip tip in
water, or use a
synnge.
Clean the pen
and the boot.
Replace the
sheet, keep hands
clean, handle
sheets along the
edges.
Replace the tip.
Do not use
0.18
mm and
0.25 mm points.