Epson T-750 User Manual Page 132
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Troubleshooting Graphics Problems
Problem
Recommendation
Strange dot patterns
appear in graphics
printouts
Printer freezes when
printing graphics
Text appears as random
graphics characters
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 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.
Problem Solving and Maintenance
C-3
- User’s Manual 1
- FCC COMPLIANCE STATEMENT 2
- FOR AMERICAN USERS 2
- Torrance, California 2
- Introduction 6
- This Manual 7
- Where to Get Help 7
- Chapter 1 8
- 1 Unpacking Your Printer 8
- Figure I-2 9
- Protective items 9
- Print head protector 9
- Installing the Ribbon 10
- Setting Up Your 12
- Replacing the ribbon 13
- Setting Up Your T-750 Printer 14
- Figure 1-7 15
- Pin-feed locking levers 15
- Figure 1-8 16
- Installing the paper guide 17
- Loading single-sheet paper 18
- 5 Turning On the Printer 19
- 6 Operating the Control Panel 19
- SelecType 21
- If SelecType does not work 22
- 8 Running the Self Test 23
- LINE FEED 24
- FORM FEED 24
- The parallel interface 24
- Figure 1-14 25
- DIP switch location 25
- Chapter 2 28
- Choosing and Loading Paper 28
- Choosing Paper 28
- Using Single-sheet Paper 28
- Preparing the printer 29
- Figure 2-2 30
- Installing 30
- Paper bail lever 30
- Loading the paper 31
- Figure 2-4 32
- If the paper does not load 33
- Reloading during printing 33
- Reinstalling the Tractor Unit 33
- Figure 2-5 34
- The Paper Thickness Lever 35
- IS 0.17 mm 36
- Chapter 3 37
- Printer Selection Menus 37
- A quick test 38
- Naming and 38
- Word Processors 39
- Spreadsheets 40
- Printer commands 41
- Graphics Programs 42
- Programming Languages 42
- Chapter 4 44
- T-750 Printer Features 44
- Quality and Fonts 44
- This is double-high printing 46
- This is normal NLQ printing 47
- The Print Head 50
- Dot patterns 51
- Pin Labels 51
- Graphics Commands 52
- Graphics data 54
- Simple Graphics Programming 54
- Density Varieties 56
- Reassigning a graphics mode 57
- Designing Your Own Graphics 58
- Figure 5-3 59
- Arrow design 59
- Figure 5-4 59
- Calculating data 59
- User-defined Characters 61
- 5-15 63
- Copying ROM to RAM 64
- 5-17 65
- Appendix A 67
- Command Summary 67
- Commands in Numerical Order 70
- ESC EM n 76
- ESC $ n1 n2 85
- 27 36 n1 n2 85
- 1B 24 n1 n2 85
- ESC \ n1 n2 86
- 27 92 n1 n2 86
- 1B 5C n1 n2 86
- (n2 x 256) 99
- Table A-2. Graphics Modes 100
- ESC \ n1 n2 data 110
- 1B 5C n1 110
- ESC = 111
- 27 61 n1 n2 . . . nk 111
- 1B 3D n1 n2 . . . nk 111
- Character Tables 112
- Epson Mode 112
- Appendix B 112
- Table B-I, continued 114
- Table B-1, continued 116
- Characters 121
- IBM Printer Emulation Mode 122
- Table B-4, continued 126
- Table B-4, concluded 129
- Appendix C 130
- General Troubleshooting 130
- Data Dump Mode 132
- IBM PC BASIC Solutions 133
- Maintaining Your Printer 134
- The print head 134
- Replacing the print head 135
- Transporting the Printer 136
- Appendix D 138
- Defaults and DIP Switches 138
- DIP Switch Settings 139
- International Character Sets 140
- Appendix E 142
- Technical Specifications 142
- Printing 142
- Mechanical 143
- Electrical 143
- Environment 144
- Parallel Interface 144
- Data Transfer Sequence 146
- Interface timing 146
- On-Line 147
- ERROR BUSY 147
- Glossary 148
- Quality 150
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