What should I do if the low-voltage power supply stops providing DC power to the MF416dw?

If DC power is not being supplied from the low-voltage power supply, the protective function against overcurrent or overvoltage may have activated and automatically cut off the output voltage. In this case, turn off the power switch and unplug the power cord, and do not plug in or turn on the machine again until the root cause is found. Additionally, two fuses in the low-voltage power supply protect against overcurrent — if overcurrent flows into the AC line, the fuse will blow and cut off power distribution. (Page 31)