User`s manual

CBM-202PC User’s Manual
16
CITIZEN
3.7 HEAD DETECTION CIRCUIT
VP is controlled so as to prevent the head from electrolytic etching.
When turning ON the VP, set 11VC (Pin 4) of the gate array (CBM-202LA)to "HIGH".
When turning it OFF, set the HVC to "LOW".
It is also provided with a temperature detection circuit which serves to prevent print quality from being
deteriorated or destroyed by temperature. This function, through use of a thermistor installed in the printer,
detects temperature based on which energy applied to the head is determined. Further, when head
temperature has exceeded 60℃, printing is stopped so that the head is protected from being destroyed.
For protection of CPU runaway, make connection so that the gate array is reset by output of the CPU
watchdog timer. The CPU itself has been set to which resetting can work. Further, to prevent the head
strobe from being turned ON at that time, place a pull-up resistance in STRB1 to STRB3 each by one.