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Service Guide ML320/ML321
Chapter 2 Principles of Operation
2.3.03 Print Head Drive Circuit
This circuit drives the printhead coils (1 through 9) using the HD ON signal, along with the nine
HD DATA signals. The pulsewidth of HD ON determines the pin drive time. The pin drive time
increases as the number of pins to be driven increases. The pins are driven in synchronization with
the signal IPT, which is derived from the timing encoder (PHASE A and PHASE B) on the space
motor.
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