Nov 212011
 
 

Machine Error 71 – Brother MFC  8420, 8820D, 8820DN DCP 8020, 8025D, 8025DN

The machine error 71 message in the Brother MFC 8420, 8820, 8820DN, DCP 8020, 8025D, 8025DN machines is related to the laser/ scanner unit motor. As the machine gets ready to print the laser / scanner motor starts rotating. Depending on the model they get anywhere between 20,000 and 40,000 RPM’s. The machine watches for the polygon motor to reach its correct RPM’s before the laser starts writing to the drum unit. If the Brother MFC 8420, 8820, 8820DN, DCP 8020, 8025D, or  8025DN laser unit  doesn’t reach that specific speed in a certain amount of time then they display a 71 machine erroron the display.

Troubleshooting the machine error 71 on Brother MFC 8420, 8820, 8820DN, DCP 8020, 8025D, 8025DN machines.machine error 71

Not much troubleshooting is involved in the machine error 71 on Brother MFC 8420, 8820, 8820DN, DCP 8020, 8025D, 8025DN machines. If you’re doing a call for your customer then I would ask if the machine as been running noisy before the error happened. Typically the 71 machine error is a result of the bushings inside the polygon motor getting dried out or dirty. Before the 71 machine error happens the motor usually gets really noisy as it gets up to speed. Some customers say it sounds similar to an airplane taking off. Most times the machine goes to a ready state when turned on but once you send a print or copy job to it it fails. Hopefully, you can hear the noise then to help verify the issue if the motor hasn’t already seized up.

Repair the Machine Error 71 on Brother MFC 8420, 8820, 8820DN, DCP 8020, 8025D, 8025DN machines.

There are two ways out there to fix the machine error 71. First, and the way I prefer to handle the problem, is to replace the laser / scanner unit. The unit is a pain to get out because it is located in the middle of the machine. For an experienced tech it shouldn’t be a big deal but for the average Joe it could be overwhelming. For anybody planning on doing this that hasn’t done one before I would recommend finding a service manual first before disassembly. Your second option is to remove the laser / scanner unit take out the polygon motor (don’t touch mirrors or lenses) clean off the shaft the goes into the motor bushings and using a light oil lubricate the post and bushings. I prefer just replacing the unit for the 71 machine error because it’s not that expensive, it’s a pain to get out, and the clean and lubricate repair doesn’t always work. Sometimes it does, other times for a while or not at all. The choice is yours, I replace the laser unit for a machine error 71 onBrother MFC 8420, 8820, 8820DN, DCP 8020, 8025D, 8025DN machines to protect my reputation and fix it right the first time.

Obviously these machines are getting on in age. If your looking for a replacement model Check out these Current Brother Multifunction machines listed below.