Head Control Circuit - Citizen CBM-202PC-04 User Manual

CBM-202PC-04 User's Manual
4.8

Head Control Circuit

VP is controlled in order to prevent electrolytic corrosion of the printing head. HVC(Pin-4) of
the Gate Array is turned to "HIGH" when turning on VP, and turned to "LOW" when turning it
off.
A temperature detection circuit is provided in order to prevent deterioration of the printing
quality or breakage of the printing head due to a temperature. This function detects a
temperature by means of a thermistor included in the printer and determines according to that
temperature how much energy should be applied to the printing head. If a temperature of the
printing head exceeds 60ºC, it will stop printing to prevent breakage of the printing head.
As a protection when the CPU crashes, connect in such a manner that the Gate Array will be
reset by an output from the watchdog timer of the CPU. The CPU itself has been set so that it
will be reset. So that the head strobe will not be turned to ON at that time, be sure to insert
one pull-up resistor into STRB1 through STRB3, respectively.
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