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3.3. Reset Circuit
This printer has two reset circuits. One is for the printer main control circuit and the other is for the engine control circuit.
3.3.1. Printer Main Control Reset Circuit
This reset circuit is used for resetting IC20 (ASIC1), IC4 (CPU), IC28 (ASIC2), CN8 (Flash ROM ), IC23 - IC25, CN5 (HDD) and
IC27 (Ethernet IC). The power-up reset signals are supplied from the reset IC7 and IC9. When +5.0V is supplied, the voltage at
point (A) rises from 0V to +5.0V. After the voltage at point (A) exceeds +4.2V, the status of reset IC9 (pin 4) goes the high
impedance. Then +3.3V is power-uped and the voltage at point (B) rises from 0V to 3.3V. After the voltage at point (B) exceeds
3.0V, the status of reset IC7 (pin 4) goes the high impedance. As a result, the NRST signal is pulled-up to high level and the IC20
receives this high level signal. After approximately 500µsec., a high level reset signal NSYSRST is supplies from pin U24 of IC20
to IC4, IC28, CN8 and ICs23 - 25 through IC5. Further, this reset signal is supplied to CN5 and IC27 through IC28.
IC27 (Ethernet IC). The power-up reset signals are supplied from the reset IC7 and IC9. When +5.0V is supplied, the voltage at
point (A) rises from 0V to +5.0V. After the voltage at point (A) exceeds +4.2V, the status of reset IC9 (pin 4) goes the high
impedance. Then +3.3V is power-uped and the voltage at point (B) rises from 0V to 3.3V. After the voltage at point (B) exceeds
3.0V, the status of reset IC7 (pin 4) goes the high impedance. As a result, the NRST signal is pulled-up to high level and the IC20
receives this high level signal. After approximately 500µsec., a high level reset signal NSYSRST is supplies from pin U24 of IC20
to IC4, IC28, CN8 and ICs23 - 25 through IC5. Further, this reset signal is supplied to CN5 and IC27 through IC28.
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KX-CL500 / KX-CL510
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