ERR1
indicates a speed issue. In this case, the motor speed as reported
from the optic sensor differs from
the speed setting. Analysis:
Optic sensor signal issue -- Either the optic sensor signal is not
right, or it is read incorrectly, or the
signal is not reaching the display. Test it for open or faulty+ clean it, and tight vbery well the connector, see the diagram adjust it Try to run the software calibration for troubleshooting and diagnostic too. God bless you
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