Adjust The Position Of The; Adjust The Upper Thread; Tension - Brother KE-436C Instruction Manual

15. TROUBLESHOOTING
Problem
Upper thread is not
trimmed.
Thread jamming.
Poor seam finish on
reverse side of mate-
rial.
Incorrect thread tight-
ness.
Machine does not
operate when power is
turned on and foot
switch is depressed.
65
Cause
Movable knife is bent.
Fixed knife is blunt.
Movable knife dose not
pick up the thread.
The movable knife does
not pick up the thread
because of skipped
stitches at the sewing
end.
Movable knife position is
incorrect.
Sub-tension is too weak.
Thread take-up spring
tension and height are
incorrect.
Incorrect needle and
rotary hook timing.
Shuttle race thread guide
is not separating the
threads.
Shuttle race thread guide
is separating the threads
insufficiently.
Upper thread is not prop-
erly tight.
Uneven upper thread
length.
Upper thread is too long.
Upper thread tension is
too weak.
Lower thread tension is
too weak.
Thread take-up spring
tension and height are
incorrect.
Head position switch
does not work.
Check
Movable knife blade
Fixed knife blade
Shuttle race thread guide
position
Needle bar lift amount
Skipped stitches at sew-
ing end
Movable knife position
Sub-tension
Thread take-up spring
tension and height
Needle bar lift amount
Shuttle race thread guide
position
Shuttle race thread guide
position
Upper thread tension
Upper thread length
Thread take-up lever
stroke
Upper thread tension
Lower thread tension
Thread take-up spring
tension and height
Head position switch cord
connection
Switching plate position
Head position switch is
broken.
KE-436C
Remedy
Replace the movable
knife.
Sharpen or replace the
fixed knife.

Adjust the position of the

shuttle race thread guide.
Adjust the needle bar lift
amount.
Refer to "Skipped stitches
occur".
Adjust the position of the
movable knife.
Turn the sub-tension nut
to adjust the tension.
Adjust the tension and
height of the thread take-
up spring.
Adjust the needle bar lift
amount.
Adjust the position of the
shuttle race thread guide.
Adjust the position of the
shuttle race thread guide.
Adjust the upper thread
tension.
Adjust the sub-tension.
Adjust the thread take-up
lever stroke.

Adjust the upper thread

tension.

Adjust the lower thread
tension.
Adjust the tension and
height of the thread take-
up spring.
Check if the cord is
disconnected.
Adjust the position of the
switching plate.
Replace the head posi-
tion switch.
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