F2-40 doesn't show up in the service manual for the AR-M237 but in other manuals it represents a toner out condition. on color machines it's the black toner. on that model check the toner add motor. the drive gear could be broken or popped out of place ( it's spring loaded ) and can be seen when toner and developer units are removed. hope this helps
Toner problem, remove toner restart copier and reinstall toner. If that doesn't work you may need a new toner.
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