Epson LQ 1050 Technical Manual - Page 87
GAE05A
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REV.-A * Gate Array (IC7A: E05A16GA) This gate array (IC7A) outputs the carriage speed control signal (PCO and PC3) to the 4-phase stepper motor drive IC (IC2A: STK6722HZ), under the control of the CPU. The carriage speed is controlled by combining the reference voltage for the 4-phase stepper motor drive IC (IC2A) with PCO and PC3. Figure 2-35 shows the block diagram of the gate array (IC7A) operation. CPU 7810HG (4B) PD7 I PDO m G GA(E05A 15HA) +5V (3A) DB7 I DBO Pco 7 R97 3.OIK PD 1 STK6722 (2A) VCC2 Vref PD Figure 2-35. GA (E05A16GA) Operation Diagram This gate array also performs another function. When a hardware error (except a paper end) is detected in the printer, the gate array outputs the power down signal (PD 1 ) to the 4-phase stepper motor drive IC (IC2A) and shuts off the +36 VDC, so that damage to the circuit can be minimized. 2-43