Appendix I
Troubleshooting
The following table described some of the problems that might occur while using the printer. For every problem there is a possible cause described here and a suggested procedure to solve the problem.
Problem | Possible Cause | Possible Cause | |
| There is no power in the electric | Check if there is a central switch for | |
| outlet. | the room / outlets. Connect some | |
|
| other equipment to the outlet to | |
|
| check its operation. | |
The printer does not turn on. |
|
| |
A problem with the power cord – it | Turn off the printer, check the power | ||
| |||
| may be broken or not well | cord’s continuity and a perfect | |
| connected to the printer and / or | connection between the printer and | |
| outlet. | the electric outlet. | |
|
|
| |
| The parallel / serial / USB cable has | Check for a good connection | |
| one or more lines with faulty | between the printer and the host or | |
| connections / broken wires. | change the cable. | |
|
|
| |
| Wrong programming sequences. | The programming sequences can be | |
The printer does not respond |
| checked in the dump mode. Put the | |
to the commands sent. |
| printer in dump mode and run your | |
|
| application again. The printer will | |
|
| show the hexadecimal and ASCII | |
|
| codes of all bytes being received | |
|
| from the host. | |
|
|
| |
| The parallel cable has one or more | Check for a good connection | |
| lines with faulty connections / | between the printer and the host or | |
Parallel communication is | broken wires. | change the parallel cable. | |
faulty. |
|
| |
The pin layout does not follow the | Check the correct pin layout in this | ||
| |||
| Centronics standard. | manual. | |
|
|
| |
| The serial cable has one or more | Check for a good connection | |
| lines with faulty connections / | between the printer and the host or | |
| broken wires. | change the serial cable. | |
|
|
| |
| The pin layout does not follow the | Check if the pin layout used | |
| correct protocol. | complies with the protocol being | |
|
| used for data transmission. | |
Serial communication is faulty. |
| Remember that the printer uses the | |
|
| RTS/CTS protocol. | |
|
|
| |
| The baud rate is incorrectly set. | If the baud rate set on the printer is | |
|
| different from the baud rate of the | |
|
| host, the printer will print random | |
|
| characters or not print at all. Check | |
|
| carefully the host’s serial baud rate | |
|
| configuration. | |
|
|
| |
| Overheating of the print head | Wait until the temperature of the | |
|
| print head goes below 140°F. The | |
The printer stops printing |
| printer will continue to print from | |
|
| where it stopped. Open the covers | |
|
| to help the printer to cool down | |
|
| faster. |
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