To reduce the level of noise from the main board, a GND plate (metal plate)
is installed onto the rear face of the main board to improve the GND.
The main board GND and GND plate are connected at several points.
However, if the connection points are inappropriate, the noise level may
increase. Therefore, great care must be given when selecting the connection
points. Connections should not be made at points where the noise level
is especially strong, such as the oscillator circuit GND.
Improving the GND is also intended to prevent static electricity from causing
a malfunction. Improving the GND suppresses any potential difference between
the GNDs generated when current from static electricity flows into the
board. |
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