Brother International LK3-B432E MKII Instruction Manual - English - Page 70

Refer to Skipped, Adjust the tension

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Problem Cause Check 16. TROUBLESHOOTING Remedy Page Upper thread is not trimmed. Thread jamming. Poor seam finish on reverse side of material. Fixed knife is blunt. Fixed knife blade Movable knife does 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. Shuttle race thread guide position Needle bar lift amount Skipped stitches at sewing end Movable knife position Sub-tension is too weak. Sub-tension Sharpen or replace the fixed knife. Adjust the position of the shuttle race 33 thread guide. Adjust the needle bar lift amount. 32 Refer to "Skipped stitches occur". Adjust the position of the movable knife. 34 Turn the sub-tension nut to adjust the 26 tension. Thread take-up spring tension and height are incorrect. Incorrect needle and rotary hook timing. Shuttle race thread guide is not separating the threads. Thread take-up spring tension and height Needle bar lift amount Shuttle race thread guide position Adjust the tension and height of the 27 thread take-up spring. Adjust the needle bar lift amount. 32 Adjust the position of the shuttle race 33 thread guide. Shuttle race thread guide is not separating the threads. Shuttle race thread guide position Adjust the position of the shuttle race 33 thread guide. Upper thread is not properly tight. Upper thread tension. Adjust the upper thread tension. 26 Uneven upper thread length. Upper thread length Adjust the subtension. 26 Upper thread is too long. Thread take-up lever stroke Adjust the thread take-up lever stroke. 34 Incorrect thread tightness. Upper thread tension is too weak. Upper thread tension Adjust the upper thread tension. 26 Lower thread tension is too weak. Thread take-up spring tension and height are incorrect. Lower thread tension Thread take-up spring tension and height Adjust the lower thread tension. 26 Adjust the tension and height of the 27 thread take-up spring. LK3-B430E-, B431E-, B432E-, B433E- Mark II 64

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64
LK3-B430E-, B431E-, B432E-, B433E- Mark II
Problem
Cause
Check
Remedy
Page
Upper thread is not
trimmed.
Fixed knife is blunt.
Fixed knife blade
Sharpen or replace
the fixed knife.
Thread jamming.
Poor seam finish on
reverse side of
material.
Incorrect thread
tightness.
Shuttle race thread
guide position
Adjust the position of
the shuttle race
thread guide.
33
Movable knife does
not pick up the
thread.
Needle bar lift
amount
Adjust the needle bar
lift amount.
32
The movable knife does not pick
up the thread because of skipped
stitches at the sewing end.
Skipped stitches at
sewing end
Refer to "Skipped
stitches occur".
Movable knife
position is incorrect.
Movable knife
position
Adjust the position of
the movable knife.
34
Sub-tension is too
weak.
Sub-tension
Turn the sub-tension
nut to adjust the
tension.
26
Thread take-up
spring tension and
height are incorrect.
Thread take-up
spring tension and
height
Adjust the tension
and height of the
thread take-up spring.
27
Incorrect needle and
rotary hook timing.
Needle bar lift
amount
Adjust the needle bar
lift amount.
32
Shuttle race thread
guide is not separating
the threads.
Shuttle race thread
guide position
Adjust the position of
the shuttle race
thread guide.
33
Shuttle race thread
guide is not separating
the threads.
Shuttle race thread
guide position
Adjust the position of
the shuttle race
thread guide.
33
Upper thread is not
properly tight.
Upper thread tension.
Adjust the upper
thread tension.
26
Uneven upper thread
length.
Upper thread length
Adjust the sub-
tension.
26
Upper thread is too
long.
Thread take-up lever
stroke
Adjust the thread
take-up lever stroke.
34
Upper thread tension
is too weak.
Lower thread tension
is too weak.
Upper thread tension
Adjust the upper
thread tension.
26
Lower thread tension
Adjust the lower
thread tension.
26
Thread take-up
spring tension and
height are incorrect.
Thread take-up
spring tension and
height
Adjust the tension
and height of the
thread take-up spring.
27
16. TROUBLESHOOTING