Brother MP-21C Service Manual page 48

During printing
If the Paper feed sensor OFF states is detected (In case that a paper of different size from the one
selected on the printer driver is fed.), the printer stops printing and ejects the paper. The remaining
print data will be printed out on the next sheet.
Ejecting the paper
Upon finishing the print, the printer keeps the paper eject operation running until both the Paper
feed sensor and the Paper eject sensor go into the OFF status. During the paper eject operation, if
the Paper eject sensor does not turn OFF after the specified amount of paper feeding performed
after the Paper feed sensor returns to the OFF status, the printer feeds the paper intermittently. If
the Paper eject sensor still does not returns to OFF, a paper jam will be detected. When both the
Paper feed sensor and the Paper eject sensor do not returns the OFF condition in 30 sec. of the
paper feeding operation, the printer detects a paper jam has occurred.
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