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REV.-A
Gate array:
The gate array listed below is one of the control circuit chips. Installed parts on the outside of the gate
array form one control and drive circuit.
E0521AA (MMU: Memory Management Unit, 8B)
The E05A21 AA MMU provides the following functions on a single chip. According to these functions,
the expanded memory area of the main control circuit can be controlled without complicated circuitry.
•
Lower address position latched output
•
Bank latch, output
•
Bit operand
•
MMIO decode, output
•
CG, Program, Ram decode
•
Reset for internal/external program change or replacement
•
ON LINE/OFF LINE process (switch)
E05A24GA (PIF: Parallel Interface Controller, 12C)
This E05A24GA PIF provides the following functions on a single chip. According
to these functions, interfacing between the main control circuit and the host
can be controlled without complicated circuitry.
•
Parallel interface data latch (lead) and output to the printer.
•
Latch timing selection is possible.
•
Set, reset, and lead of control signals (ACK, BUSY, ERROR, etc.)
•
INIT signal latch from the host and output to the printer
•
READY lamp ON/OFF
•
RXD signal exchange (serial interface)
•
I/O sensor and switch signal reading (LOAD/EJECT, RL) and drive signal output (LOAD/EJECT
lamp, Release solenoid)
E05A22EA (PHC: Print Head Controller, GB)
This E05A22EA PHC provides the following functions on a single chip. According to these functions,
all of the print head drive controls can be controlled without complicated circuitry.
•
Head data latch
•
Head (piezo solenoid) charge/discharge control (timing, power range)
•
Direct control of the dot data to the head nozzle line (vertical dot pitch control)
•
Half protect
•
Print timing sample
•
I/O sensor signal reading (IE,ICE,TE,PE,CSF) and pump unit control signal output (pump motor,
valve solenoid)
E05A23GC (DCU: DC Motor Control Unit, 4B)
This E05A23GC DCU is a gate array that carries out all of the main printer carriage motor controls on
a single chip, and it provides the functions listed below. The DCU is connected to the carriage motor
drive circuit, motor encoder,and the carriage home-position sensor, and according to these, performs
carriage motor positioning, speed control, and print timing generation without complicated circuitry.
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