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Troubleshooting Graphics Problems
Problem
Strange dot patterns
appear in graphics
printouts
Printer freezes when
printing graphics
Text appears as random
graphics characters
Recommendation
Many computers have problems sending
one or more of the codes between 0 and
13. Try to avoid these characters.
Be sure that no other commands or
carriage returns come between the
graphics command and its data.
If the printer freezes in graphics mode,
you have probably not sent enough data.
If you interrupt the computer while it is
printing in graphics mode, for example
during a screen dump, it may not reset
the printer to text mode. If not, the next
text printed will be interpreted by the
printer as graphics data. Turn off the
printer and turn it back on again to reset.
Data Dump Mode
The FX has a special feature that makes it easy for experienced print-
er users to find the causes of problems. The hexadecimal (hex) or data
dump mode gives a printout of exactly what codes reach the printer.
Enter this mode by turning on the printer while holding down the
FORM FEED and LINE FEED buttons at the same time. Then, when you
run a program, either an application program or one you have written
in any programming language, the FX prints all the codes being sent to
the printer in hexadecimal format.
If the characters are printable, they appear in the column on the
right as their true ASCII characters, as shown below. Non-printable
codes, such as control codes, are shown in this column as a dot. The
far left column of the table contains four-digit line numbers.
Problem Solving and Maintenance
C-3