The code was not included among the Status Code Indicator RAPS. U2-40 is a Communication Error between the Main PWB and the CRUM on the Toner Cartridge (CRU).
Sounds like the toner cartridge is not seated or is defective.
What that message is saying is that the small chip on the back of the toner cartridge is not communication with the processor board.
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U2-40
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