Test page output; Plot length accuracy; Plot quality.

A.  The confidence plot, when output, will list the communication
    parameters for each of the serial and parallel ports on the plotter.
    It also creates 3 different pictures of the plotter.

B.  To initiate the Confidence Plot:

     1.   Turn the plotter on.

     2.   Verify that paper is loaded.

     3.   If plot length accuracy is desired, use OPCOM to set SCALE=1/1
          and MECH_COMP=1.00/1.00

     4.   Take the plotter OFFLINE, by pressing the ONLINE button.

     5.   Press and hold the PAPER FEED button followed by momentarily 
          pressing the ONLINE button.

     6.   The ONLINE light will blink momentarily and the Confidence plot
          will begin printing.

C.   Examine the Confidence Plot output.

     1.   If OPCOM was used to set SCALE=1/1 and MECH_COMP=1.00/1.00,
          then plot length accuracy may be determined and/or adjusted.
          Perform the following steps:

          a.   Measure the length of the box containing the CalComp logo
               from top to bottom. The box should measure 14 inches from
               top to bottom.

          b.   If the length measures other than 14 inches, reset the
               control by turning the knob at the back of the plotter,
               on the control-panel side.  Clockwise rotation decreases
               the length; counterclockwise increases the length.  Each
               increment (e.g., from 6 to 7) produces between 0.008 and 0.017
               inch change, depending on the media thickness. The knob can
               rotate about one revolution. Do not force it beyond one
               complete turn.

          c.   Repeat adjusting the knob and outputting the Confidence plot
               until an accurate plot has been made.

     2.   If the plot quality is unsatisfactory, then the image head may
          require cleaning. Perform the following steps:

          a.   Allow the thermal head to cool by turning off the plotter
               power.  Wait for at least 30 minutes.

          b.   Locate the package of Alcohol Prep Swabs in the supplies
               included with the plotter.  If more Alcohol Prep Swabs are
               needed, obtain more at a local drug store. Lens-cleaning
               tissues or facial tissues are also needed.

               NOTE: A paper towel will scratch the image head and must NOT
               be used.

          c.   Open the plotter cover and remove the media roll.

          d.   Due to electrostatic discharge, touch the cutter media guide
               before touching the image head.

          e.   Tear open the foil package and remove the Alcohol Prep Swab.
               Avoid dripping alcohol on either the plot media or the platen
               roller.

          f.   Wipe the Alcohol Prep Swab along the black line on the image
               head. This line is the heat resist area that images the media.
               Residue normally accumulates just above this line.

          g.   Rub back and forth, concentrating on areas that feel rough or
               have a dark deposit, until the alcohol has dissolved any
               residue.  In extreme cases, a second swab may be required.

          h.   When the image head feels and looks smooth, use a SOFT tissue
               to remove any film. For better results, moisten the soft tissue
               with the alcohol from the Alcohol Prep Swab.

          i.   Use a dry soft tissue to remove any alcohol.

          j.   Load media in the plotter and replot the Confidence Plot.

     3.   If the plotter has been idle for more than two hours, the image
          head may need additional time to warm up. Try sending a couple of 
          plots to the plotter and compare the results. 

     4.   If the plot quality is satisfactorily from the Confidence Plot,
          but other plots produce poor quality, then the output speed may have
          been set to a faster draft mode, causing poorer quality plots.
          To achieve better quality plots, perform the following steps:

          a.   Use the OPCOM program to set OPMODE to QUAL.

          b.   For all DrawingMaster plotters except the 52224: If banding
               appears on the plots, then use the OPCOM program to set
               RASTSPEED to a smaller value. RASTSPEED=1 is the slowest,
               best quality. RASTSPEED=10 is the fastest, lowest quality.