5.2.3 DC switch trip when power on
① A multimeter can be used to check the internal circuit of the controller, if there is
a short circuit, the machine has been damaged
② Check if the machine has a burning smell; if there is a burning smell, please
contact the agent to replace the controller
5.2.4 The keyboard without display after power on
① Use a multimeter to measure the input voltage of the controller; check the
voltage is normal.
② Check if the machine has a burning smell; if there is a burning smell, please
contact the agent to replace the controller
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