Operating Precautions - YAEN YAEN208 Series Technical Reference

2.4.10 Operating precautions

In order to prevent the printer head heater element overheating or burned up, when we
designing products, pay attention to the points as follows:
In hardware terms:
1) When the power on, the order should be VDD→VH.
2) When the power is on or stand by, make sure that the STROBE signal is in invalid
state.
3) Make sure if program is abnormal (such as system halted), VH voltage should be
shut off automatically.
4) During the printing, Detecting thermistor temperature, make sure that the
thermal printer head (TPH) is not overheated.
In firmware terms:
1) STROBE time should not be too long.
2) In the following two cases, do not start:
① when paper jammed; ② When the paper is out.
3) When the power is on or each printing task completed, it is recommended to
send blank data to the mechanism, so it can prevent the printer head from
damaged if there are some hardware failure on the control board.
4) Over-temperature protection:The printer stops working when heating
temperature is greater than 75℃,and start working again when the temperature
down to 60℃.
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YAEN208 technical reference
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