BROTHER MFC9840CDW " Unable to print error 72 " ?

[CopyX]

Brother mfc9440 is displaying the message, "Unable Print 72 ".

Does anyone know what this error message is referring to?

[yakyitz]

It's either condensation power off wait until temperature stabilizes and try powering on.
check harness to laser unit. replace laser unit. replace engine PCB.
error means "beam detecting sensor (k) failure"

[CopyX]

Thanks makes sense temperature dropped overnight where it was stored.

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