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Rev. A Outline of Operation 2-5

TM-J8000/J8000P Technical Manual

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Data Input and Printing

Figure 2-7 shows a block diagram of the driver IC. Each driver IC receives input through its DI

(data) and XSCL.(sync) lines. These inputs are implemented separately on each of the two driver

ICs (so that each receives data independently).

The serial print data enters through the DI and moves into the SHIFT REGISTER in sync with

the XSCL signal. The data then moves into the LATCH in accordance with the LP timing signal.

The latched data passes through the inverter and sets the appropriate bits of the segment

driving, causing the nozzles to operate.

To control actual printing, the driver IC feeds the V3 terminal voltage waveform selectively to

the COM and SEG outputs. (See Fig. 2-8.) Ink ejection is generated when there is a difference

between the COM and SEG output voltages. To print a segment, the IC produces a positive

difference for the first pulse followed by a negative difference for the second pulse. To withhold

a segment, the IC maintains a zero difference.

The level and width of the applied pulse is adjusted according to the head rank (specific to each

head), the gap rank, and the temperature as detected by the thermistor. On the Main circuit

board, the head rank read information indicated by short-land setting. The gap rank sets DIP

switch on the Main circuit board to match the gap-rank marking on the head board.

Figure 2-7 Block diagram of driver IC

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Epson TM-J8000 Spezifikationen Seite 31