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REV.-A
•
PLL, PRC motor speed control
•
Full power acceleration and breaking control
•
Drive current interrupt circuit
•
Motor stop detection and signal output
•
Generation and output of print timing signals (PTS) to the print head control circuit
•
Carriage position counter
•
Home position detection and print start position (line position) setting functions
E05A09BA (MCU: Motor Control Unit, 2A)
This E05A09BA MCU is a gate array that controls with a single chip the stepping motor used in the
main printer, and it provides the functions listed below.
This MCU is connected to the paper feed motor and the TE holder drive circuit, and carries out motor
control as a single circuit, thereby reducing the CPU load.
•
Automatic control of phase data (normal/reverse revolutions counter) and output for stepping
motor control
•
Time control for phase switch over stepping Two channels
SED1200 (LCD Driver, SEIPNL Board)
The SED 1200, which contains the CG for the LCD, is a 20-column LCD controller.
In addition to the CG, the SED 1200 also contains a CPU and internal memory, and carries out operation
by external commands.
The analog circuits are as follows:
Reset circuit
The reset circuit supplies a reset signal to the logic circuit. The Vx voltage that generates the power-on
reset signal is supplied as the pull up voltage for analog circuit protection.
Head voltage generating circuit
This is a DC-DC converter circuit which converts
+
24VDC into the voltage (93-160V) necessary for
driving the print head.
Timer circuit
This is a timer circuit that counts the operation intervals for automatic head cleaning.
Backup
This backup controls the Vbak supply, and is the backup voltage when power to the SRAM (13C) is
off.
2-9
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