Reset Circuit

Figure 2-16 shows a block diagram of the reset circuit.

The Vx circuit is the power-on reset circuit which generates the reset signal when the voltage becomes unstable due to the printer power being turned on or off. The reset signal is input to the E05A1 6GA gate array via the CPU, amplified, then supplied to the E05A38NA gate array and optional interface to reset each IC.

The circuit monitors the + 12 V line using Zener diode ZD2, and the threshold voltage level is 4 V. Transistor Q2 is turned on or off by ZD2.

Table 2-14. Power-On Reset Status

+12 VDC Line Level

Q2 Status

Vx output

RESET signal

< 4 VDC

OFF

GND (OV)

Low

4 VDC <

ON

+ 5V

OPTION l/F RESET SIGNAL

Figure 2-16. Reset Circuit Block Diagram

OPTION l/F RESET SIGNAL

Figure 2-16. Reset Circuit Block Diagram

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