Cutter Does Not Return; Cutter And Upper Thread Scissors Touch; Seam Is Cut - Brother HE-800A Service Manual

Cause
Solenoid stopper
Cutter bar guide

5-19. Cutter does not return

Cause
Cutter
Sticks in material
Cutter bar guide

5-20. Cutter and upper thread scissors touch

Cause
Upper thread
scissors

5-21. Seam is cut

Cause
Length of knife
setting
Knife space setting
Cutter
Check
Nut
Cutter sensor position
Smoothness of cutter
operation
Check
Cutter blade
Needle plate
Smoothness of cutter
operation
Check
Check if the cam opens
the stop plate.
Check
Length of knife
Cutting of zigzag seam
Cutter play
Cutter knife bending
Remedy
Check if the nut is loose, and tighten it securely.
⋅ Adjust the cutter sensor position.
⋅ Check if the mounting screws are loose, and
tighten them securely.
4.5 ± 0.5 mm
Adjust the cutter bar guide so that the cutter
operates smoothly with no play.
Remedy
If blade is worn or chipped, sharpen it or replace it.
Replace with the special needle plate (optional).
Adjust the cutter bar guide so that the cutter
operates smoothly with no play.
Remedy
Adjust the cam position.
* If the feed mechanism operates when the cam has
not opened the stop plate, the cutter will bump
against the upper thread
Remedy
Set parameter number 02 to the same value as the
length of the knife being used.
⋅ Use parameter number 06 to set the knife X
space.
⋅ Use parameter number 08 to set the knife X
position alignment.
Adjust the cutter bar guide so that the cutter
operates smoothly with no play.
Use the cutter holder (option) to prevent the cutter
knife from becoming bent.
HE-800A
5. TROUBLESHOOTING
Cutter sensor
4017Q
scissors .
4018Q
4019Q
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