Appendix D Miscellaneous Notes - Epson TM-300A Operator's Manual

b) When the receive buffer capacity is 1 Kbyte
During data entry
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In the OFF-LINE state
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When the receive buffer is in the buffer-full state
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NOTES: The state when the remaining space in the receive buffer is 0 byte
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is called the buffer-full state.
If the BUSY signal is sent when the printer is HIGH, the data is
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ignored.
The TM-300PA/PB do not have ON-LINE/OFF-LINE switch.
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The printer goes OFF-LINE in the following cases:
During and after self-test printing.
When the printer cover is open.
When paper is fed using the paper feed switch.
When printing stops because of paper end (paper-end status
selected by ESC c 4.)
During the period from when the power is turned on to when data
reception becomes possible after the printer initialization com-
pletes.
When an error has occurred.
When printing is stopped due to exceeding the allowable print
duty cycle.

APPENDIX D Miscellaneous Notes

Print duty
When printing exceeds the allowable print duty cycle, the TM-300A/B and the
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TM-300PA/PB automatically detect that the print head temperature is too high,
stops logic-seeking, and starts full-column head movement operation. These
operations restrain the head temperature rise by lowering the print duty per
time unit. If the print head temperature continues rising due to excessive print
duty, the printer stops printing, In this case, the user should be aware that the
printing speed may slow down greatly.
Avoid printings that continuously use the same printhead pin. (Especially,
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printing speed slows down greatly when pin 9 is continuously used because it
is used to detect the print head temperature.)
When printing stops due to a rise in the head temperature, the PAPER LED
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Minks according to the blinking pattern in Figure 5-1., and the printer goes OFF-
LINE.
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