A794 Owner’s Guide | Chapter 4: Print Specifications |
Duty Cycle Restrictions (Printing Solid Blocks)
There are restrictions on the duty cycle because of the heat generated by the receipt thermal printhead when printing solid blocks (regardless of the length of the block in relation to the print line). The restrictions are ambient temperature, the percentage of time (measured against one minute) of continuous solid printing, and the amount of coverage.
Caution: When the duty cycle approaches the limits shown in the table, the receipt printhead will heat up and shut down. This may damage the printhead.
To avoid this problem, do one or a combination of the following:
4.Reduce the amount of coverage.
5.Reduce the time of continuous solid printing.
6.Reduce the ambient temperature.
Allowable Duty Cycle (measured over one minute of continuous printing)
Amount of Solid Coverage |
| Ambient Temperature |
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| 25°C | 35° C | 50° C |
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20% | 100% | 50% | 20% |
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40% | 50% | 25% | 10% |
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100% | 20% | 10% | 4% |
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For reference:
♦A typical receipt with text (contains some blank spaces) is approximately 12% dot coverage.
♦A full line of text characters (every cell on the line has a character in it) is approximately 25% dot coverage.
♦Graphics are approximately 40% dot coverage.
♦Barcodes are approximately 50% dot coverage.
♦A solid black line is 100% dot coverage.
December 1999 | 31 |
