There is a silver label on the bottom of Xiaomi printer with a pin code on it. Be careful not to add a horizontal line when typing. The pin code will appear when the printer is connected, because the router is equipped with WPS function. Pin code is a verification method of WPS, which is equivalent to a wireless password and only supports WPS-enabled wireless routers.
Printer faults and solutions:
There are many reasons why the indicator light does not light up after the printer is powered on. Check whether the AC voltage input is normal first, and check the 220-volt power signal line. Check whether the printer power board fuse is blown, and if it is blown, please replace the fuse.
If the newly replaced fuse blows again, disconnect the equipment related to 35V and check whether there is any problem with the plug-in. Check whether the output voltage of the power board is normal. If not, please repair the circuit board.
The printer's three red lights were on all the time when the printing task was executed, but the printing did not continue. This may be that the printing paper did not enter or the motherboard burned out. At this time, you can feed paper to the printer by hand to see if it can be printed. If not, the printer motherboard may be burnt out. It's best to ask professional maintenance personnel to repair the printer.
If there is a paper jam during printing, you must first turn off the power of the printer and carefully take out the printed paper. The method is to slowly pull out the paper clip along the paper outlet direction, and after taking it out, be sure to check whether the paper is complete, so as to prevent the broken paper from remaining in the machine and causing other faults.