Parallel printing with a Tektronix 4696

Hello,
   Has anybody experienced problems with plotting to a Tektronix 4696
plotter via a parallel connection? We get streaking of the output file
plus garbled characters. Any solutions/suggestions would be appreciated!

                                         Thanks in advance

                                           Mary
                                           (mfc@gjss2b.ncs.usace.army.mil)