Troubleshooting Graphics Problems

 

 

Problem

Recommendation

Strange dot patterns

Many computers have problems sending

appear in graphics

one or more of the codes between 0 and

printouts

 

 

13. Try to avoid these characters.

 

 

 

Be sure that no other commands or

 

 

 

carriage returns come between the

 

 

 

graphics command and its data.

 

 

 

Printer freezes when

If the printer freezes in graphics mode,

printing

graphics

you have probably not sent enough data.

 

 

 

Text appears as random

If you interrupt the computer while it is

graphics

 

characters

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 T-750 has a special feature that makes it easy for experienced printer 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 T-750 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.

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