Print Unable 71 Error Message on the Brother 8480 / 8890 / 8085 / 8080
Diagnostic Aids for the Print Unable 71 Error on the Brother MFC – 8480 / Â 8890, and DCP- 8080 / Â 8085
The Print Unable 71 error message has to deal with laser unit polygon motor. On most Brother machines the laser unit doesn’t start up till it starts to print. When the motor starts up it typically sounds like a CPU fan starting up in the middle of the machine. The polygon motor usually runs 20 to 40,000 RPM’s depending on the machine. If the motor fails to get up to operating speed in X amount of time then the machine will produce a print unable 71 error message. Most times it is a result of the lubrication breaking down in the polygon motor bushing. Sometimes you can remove the motor from the bushing, clean it out, and apply a lubrication of a really light weight machine oil, other times you will have to replace the unit. On most Brother machines it’s more involved in removing a laser unit than HP models so when confronted with a noisy or locked up motor I tend to replace them as they are relatively inexpensive and it’s not cost effective to have to repeat the disassembly procedure if lubrication fails to fix the problem or a return visit.
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Sometimes this is just a random occurrence. We have one that gives this error every few months and we simply turn it off and back on and it goes away. Â Other times you can hear them going out. It’s hard to explain how it sounds but it’s pretty obvious. Some people compare it to an airplane taking off because the motor gets so loud your sure something is going to explode, other times its a high pitch whining noise. The main thing is the machine starts making an odd noise and it’s usually quite obvious something is amiss.
Troubleshooting the Print Unable 71 Error Message
1. Turn the machine off then back on
2. Replace the Laser Unit or Clean and Lubricate the shaft and bushing
3. Replace the Main Board PCB
In these newer models, Brother has given the laser unit a life expectancy of 100,000 prints or copies, I find this number highly inaccurate. I have never serviced a machine with a 100,000 prints and thought this laser unit needs replaced. I have over a handful of 8460, 8480, and 8890’s in the field that have will over 200,000 prints and haven’t had to replace the laser unit yet. So when you get the replace laser Unit message I would just reset the counter and only replace the unit when you get a Print Unable 71 or 72 error.
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