Question about Brother MFC-7820N Laser Printer
Error message -cooling down- waiting for a while - I waited 30 minutes and still fan blows hard and error persists.
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Posted on Jan 02, 2017
yes, there is a fuse, two actually, inside the unit. My 7820N died after a power surge. here is how I fixed it.
unplug the power cord
raise the glass/ feeder assembly
open the front cover and remove the toner cartride.
Remove the phillips screw on the right side of the printer (same side as the power switch)
open the back paper path cover and remove the phillips screw
Flip the printer on its side and using a small screwdriver, press in the tabs that hold on the side cover. as with everything plastic, be careful since things break easily.
Once the side cover is off, remove the screws holding down the large metal cover over the power supply
Remove the screws holding the circuit board.
remove the three connectors on the front side of the board and flip it around.
By the time you have reached this point, you have probably noticed little pieces of fuse and MOV scattered around the inside of the unit, assuming you had a good power spike.
The fuse that blew for me as a 4 amp, fast blow fuse. It is soldered into the circuit board. I unsoldered the ends of the fuse that remained and soldered in a new 4 amp 5x20mm fast blow fuse. the MOV was also blasted, but I didn't have one of those to replace it and you can't get them at Radio Shack. I'll just plug it into a surge suppressor which will accomplish the same thing.
After reassembling, I was back in business.
Posted on Mar 02, 2009
I just had same issue, it shared an outlet with a large volume work group copier, I unplugged it, opened and closed all compartments to make sure something open was not causing issues. I plugged it into different outlet and it appears to be back online. I have read some postings that this model has been known to draw over 15 amps. Its possible its starving for power. To test take to another room, plug in outlet by itself and see if it boots up.
Posted on Jun 01, 2009
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