| 摘要 |
A dot matrix print head energy control circuit (commonly known as voltage source compensation) utilizes two pulse width modulator circuits (one for receipt printing and one for forms printing). The control circuit also comprises control circuitry and a data latch, the circuitry including RC networks and comparators responsive to outputs of the data latch. A FORMS signal, when inactive and utilizing a source or applied voltage of 24 volts, sets or selects the RC network for receipt printing having an energizing pulse duration of approximately 340 microseconds, and the FORMS signal when active sets or selects the RC network for forms printing having an energizing pulse duration of approximately 380 microseconds. A source or applied voltage of 28 volts sets pulse durations of approximately 300 and 340 microseconds for receipt and forms printing, respectively.
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