Epson LQ-570 Service Manual page 15

REV.-A
1.6.11 Printer Protection for Heavy-Duty Printing
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This printer has a printhead protection function to prevent it from overheating and to handle the printer when the
head driver voltage drops. If head temperature exceeds its maximum value, printing
head temperature drops to a certain value before printing resumes. Printing resumes at a lower print speed at first.
However, as the head temperature decreases, print speed increases to normal speed automatically. If the head
temperature continues to increase at the lower speed, printing is stopped or resumed as temperature increases or
decreases.
If the voltage supplied to the head drive circuit drops below its minimum limit as a result of heavy-duty printing,
printing is interrupted immediately. When the power supply voltage recovers to a certain level, the remaining print
line is printed at hatf speed. This protective action occurs when half or more of the wires are activated mntinuously.
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automatically until the