| To suppress noise conduction from the main board to the
printer cable, EMI filters are installed on the printer cable port
(parallel interface). To suppress noise conduction to the AC power
supply cable, EMI filters are installed on the DC power supply input
and DC power supply line. To suppress noise caused by the motor, EMI
filters are installed on the motor control signal lines.
When noise radiated from the board itself is combined
with noise from the surrounding cables, ferrite beads are installed on
the clock and bus lines.
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