Print Head Drive Circuit - Oki ML390 Service Manual

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Service Guide ML390/391
Chapter 2 Principles of Operation

2.3.03 Print Head Drive Circuit

This circuit drives the printhead coils (1 through 24) using the HD DV signal, along with the twenty-four HD
DATA signals. The pulsewidth of HD DV 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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