Brother HE-800B - Lower Thread Is Not Trimmed (Pulls When Material Is Removed); Feed Mechanism Does Not Move and Error Occurs

HE-800B
11. TROUBLESHOOTING
166
11-25. Lower thread is not trimmed (pulls when material is removed)
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Page
Fixed knife set
Fixed knife and movable
knife do not mesh.
Adjust the fixed knife set installation position.
104
Knife tip is bent or chipped.
Repair or replace the knife.
–
11-26. Feed mechanism does not move and error occurs.
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Page
Feed motor
Cord connection
Check if there are any problems with the connection
and contacts of feed motor connector P22 on the main
P.C. board.
INSTRUCTION
MANUAL CD
Upper thread trimmer
Upper thread trimmer
position
Remove and re-install the upper thread trimmer.
101
Check if the cam opens the
stop plate.
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 trimmer.
102
Feed home position
Feed home position
Adjust the feed home position.
86
Feed timing belt
Feed timing belt tension
Adjust the feed timing belt.
54
4024Q
Fixed knife
Movable knife
Install so that the projection on
trimmer M is
not inserted.
* Always make sure that the upper
thread trimmer is in the correct
position before use.
4018Q
4895M