Epson FX 1170 Service Manual - Page 45
How the, Works, voltage change and stops printing until the head temperature cools.
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REV.-A Figure 2-1 shows the action of the printer mechanism when a single dot is printed. Dot Wire Wire Resetting Spring Stopper \ \ Ribbon Mask Platen )b .ctuatlngT:-Rbf)cl Paper B$l=lieaclDrivingCOil Actuating Plate Spring Figure 2-1. How thePrinthead Works . c--.-.,". The printhead tends to heat up after a period of continuous printing. To minimize the dot wire drive coil overheating, the head is equipped with a thermistor that can detect the head temperature. When the thermistor detects changes in the printhead temperature, the voltage signal changes. The CPU detects the voltage change and stops printing until the head temperature cools. The printhead is also used asa buzzer. Head driving coils move allthedotwires backandforth atafrequency -.,, of 1.5 KHZ for 40 I.M without impacting the platen, so that the wires vibrate. The vibrating dot wires sound like{ .=: a buzzer. -.. ,. 2-2