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Use this guide to replace a worn out tire ring for the bobbin winder of a Brother CS-80 sewing machine.
Over time and with constant usage, the bobbin winder tire ring in a Brother CS-80 sewing machine can wear out, break, or even disintegrate. You may need to replace your tire ring if your machine has issues with winding the bobbin correctly.
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Turn off the machine.
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Unplug both the power cord and the foot pedal.
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Slide the clear flap to the left to remove it.
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Pull the latch to detach the bobbin cover.
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Remove the bobbin from the bobbin shuttle.
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Use a flathead screwdriver to pry off the plastic plate that surrounds the bobbin shuttle.
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Open the bobbin winder cover.
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Flip up the spool pin.
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Remove the grey bobbin winder seat from the bobbin winder shaft.
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Remove the 13 mm Phillips head screw from the left side of the bobbin winder.
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Pry off the bobbin winder thread spool pin and the attached bottom plate of the bobbin winder area.
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Remove the 8 mm Phillips screw from the metal plate to the right of the motherboard.
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Open the thread compartment.
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Press the back level on left side of the machine to eject the thread cassette compartment.
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Remove the thread cassette compartment by pulling it up.
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Remove the front clear shield to the thread cassette compartment holder by pulling it away from the machine.
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Remove the single 19 mm Phillips head screw from the back of the internal thread cassette compartment area.
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Turn the machine so the back is facing you.
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Remove the three large 19 mm Phillips head screws from the back left face of the machine.
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Remove the 19 mm Phillips head screw from behind the handle of the machine.
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Remove the large 19 mm Phillips screw from the bottom right of the machine.
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Remove the 33 mm Phillips head screw by the presser foot lever.
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Slowly pull apart the two sides of the sewing machine.
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Gently disconnect the ribbon cable from the motherboard.
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Disconnect the 6-pin connector from the motherboard.
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Completely pull apart the two halves of the machine.
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Set aside the front side piece.
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Place the back piece down so that the inside faces upwards.
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Remove the gold 9 mm Phillips screw from the front right of the motherboard.
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Remove the two silver 7 mm Phillips head screws from the front and back of the left side of the motherboard.
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Slide out the motherboard from the white plastic motherboard housing.
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Disconnect the 3-pin connector from the front left side of the motherboard.
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Disconnect the 4-pin connector from the left underside of the motherboard.
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Flip the motherboard over so it rests upside down and away from the balance wheel.
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Use a flathead screwdriver to pry off the tire ring.
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To reassemble your sewing machine, follow the disassembly instructions in reverse order.
To reassemble your sewing machine, follow the disassembly instructions in reverse order.
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