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3.2 Control Unit
The control unit consists of the following (see Figure 3.2):
. Control
circuit
. operator panel
. Hammer magnet driver (with the register unit only for M3l343)
. Power supply
Control
circuit
The control circuit is on one PC board and is installed in the maintenance
which can be accessed by opening the forms rack at the rear of
section,
the
printer.
The control circuit uses 2 microprocessors; one for interface control and
the other for printer control.
The LSI for print control reduces the number of parts and improves
reliability.
Operator panel
The operator panel is located at the upper front of the printer.
switches and indicator lamps on the operator panel ar'e on a PC board.
Hammer magnet driver
The hammer magnet driver for the 136 magnets is on one PC board. In
connected directly to the magnet assembly on the PC board.
hammer magnet driver is installed near the control circuit board and the
lead from the magnet assembly is connected to the hammer magnet driver
through the register unit.
A simple circuit is achieved by using custom ICs and a transistor array,
enabling easy detection of faulty columns.
Power supply
The power supply consists of the supply unit and a transformer.
The transformer is connected to an AC input through a line filter and a
circuit
breaker.
switching the appropriate tap on the transformer.
The power supply unit has regulation circuits for logic circuits and
hammer magnet driving, a forms feed stepper motor drive circuit, and
relays for the AC motor.
control
Input voltages of 100 to 240 V can be selected by
Control
In M3043, the
3 - 3
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