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Brother pe-770 f05 speed sensor error - How to fix?
F05 error, speed sensor. I fixed successfully 2 of those. Speed sensor is located on a small board, under a protective plastic, located over the main front board. Remove front panel and bobin winder assembly. Remove the 2 screws of the small board. Remve CAREFULLY the small bord. Under, on the main shaft, are located the needle positionning sensors and the wheel of the speed sensor (left wheel on the shaft). The speed sensor is located on the board itself, it's very small. Clean carefully both the wheel and the sensor with Q-Tips and alchool, reassemble the whole thing and it should restart.While U are there, take a thin nozzle oiler and lubrificate all the suppots of upper and lower shaft, all the needle bar mechanism and rotary hook central shaft and gears WITH VERY THICK oil. Needle bas assembly is the most critical point. I have 14 of those machines, almost all of those seized there before I learn how to lubrificate it. Also seized on the bottom shaft and on rotary hook pin
Automatic needle threader won't work on brother pe-770
Always make sure the hand wheel is at the exact top. Have you replaced the need recently? If it's bent, then the threader will not work. If the needle is loose or not all the way to the top in the holder, it will also cause the threader to not work.
How to assemble a bobbin case from a brother pe770
It would probably be best to just buy a new bobbin case for your machine. There are some very intricate settings for a bobbin case to work and unless you have the technical expertise and tools, it most likely will not perform satisfactorily. (FWIW, many sewists, me included, have more than one bobbin case for a machine because each is set up for different weights of bobbin thread. For the most part, they are not that expensive.)
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