Media slipping  (Plotter is not holding the media securely).

A.    Determine if  the media is slipping or is the data shifting.  If you
      can visually observe the media moving follow steps 1 through 3 below.
      If you are uncertain if the media is moving or the data is shifting
      please go to #4 of this document.

      1.    Clean the pinch rollers (small rubber rollers that hold the media
            to the surface of the plotter).  The pinch rollers can be cleaned
            with a clean cloth  moistened with Isopropyl alcohol.  The  pinch
            rollers can become encrusted with residue from the chemical
            coating on the media and begin to lose their ability to hold the
            media.

            a.    If the pinch rollers are damaged, have flat spots, or have
                  worn down, cleaning will not be sufficient and replacement
                  is recommended.

            b.    The 1023/1025/1026 Pen Plotter Maintenance Manual is
                  available for non-contract customers who wish to do their
                  own hardware repair.  The Maintenance Manual can be ordered
                  in Parts and Supplies by calling 1-800-Cal-Comp(1-800-225-
                  2667) and use Part Number M0010-900 to order.

            c.    Free Illustrated Parts Breakdowns (IPB's) are available via
                  CalComp's FaxBack (714-821-2914) and ordering:

                  Document 3004 for Model 1023

                  Document 3005 for Model 1025

                  Document 3006 for Model 1026

            d.    CalComp Technical Support does not offer support for
                  hardware repairs.  On-site service is available for
                  hardware diagnosis and repair.

      2.    Clean the drum on the plotter.  The drum is the round roller with
            the gritty exterior that turns and moves the media front to back.
            The gritty surface on the drum can become encrusted with chad
            (media residue/cotton fiber from the media).

            a.    Clean the drum with a brush or use masking tape to remove
                  the chad from the drum.

            b.    If the gritty surface of the drum is worn smooth, then it
                  will no longer hold the media securely and the drum should
                  be replaced.  Place a service call for diagnosis and
                  repair. The drum is not end-user installable.

      3.    Check to see if CalComp media is being loaded in the plotter.

            a.    CalComp media is recommended for use with this plotter.
                  Different vendors use different chemical coating on the
                  surface of media.

            b.    Recommend media thickness is between 3 to 5 mil.

            c.    CalComp Service Contracts do not support other
                  manufacturer's supplies.

      4.    If it is unclear whether the media has slipped or the data has
            shifted, perform the following Media Slippage test to help
            isolate the condition.  To determine if your media slipped/moved
            during the plot:

            a.    Manually stroke the pen on a piece of media to make sure
                  the ink is flowing.

            b.    Load that pen in position 1 of the pen turret.  Load only
                  one pen, leave the other pen positions in the turret empty.

            c.    Load and size the media.

            d.    On the plotter keypad, press the EXIT key.

            e.    Press the NEXT key once.

            f.    Press the softkey for PEN SELECT.

            g.    Select pen number 1.

            h.    Use the up/down selection to lower the tip of the pen to
                  the media.  As the tip of the pen touches the media it will
                  leave a small dot on the media where the tip made contact.

            i.    The plotter will automatically return the pen to the
                  turret.

            j.    Using the plotters keypad, place the plotter on-line.

            k.    Send the plot to the plotter and wait for the plot to
                  finish.

            l.    When the plot is finished,  repeat steps d through h.

            m.    Examine the two dots that were placed on the media.   If
                  the two dots match, then your media did not slip and your
                  data shifted while plotting and was attributed to media
                  slipping.  Refer to Problem Summary: 102X DATA SHIFTING.

            n.    If the dots were offset and did not align, then the media
                  physically slipped while plotting or the media expanded
                  while plotting due to humidity in the environment.

      5.    Bond and vellum media contain cotton fibers that can absorb
            moisture from the air and cause your media to expand.  If the
            Media Slippage test, described above in step 4, was performed and
            the dots did not match, consider running the same plot on Mylar.
            Mylar is not as likely to expand or contract due to environmental
            conditions as paper-type media does.

            a.    Load a sheet of Mylar and send the same plot file that you
                  used in Step 4 above.   If  your output looks correct on
                  the Mylar but not on Bond or Vellum media, it is likely
                  that the media is expanding due to humidity.  Consider
                  letting your Bond or Vellum media acclimatize by removing
                  the sheet of media from its packaging for an hour or more
                  before plotting on it.