Brother International KE-430F Instruction Manual - English - Page 87

Poor seam finish on, <When using the thread nipper

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11. TROUBLESHOOTING Problem Cause Upper thread is not trimmed. Movable knife is blunt. Remedy Replace the movable knife. Ref. P. 68 Fixed knife is blunt. Sharpen or replace the fixed knife. Thread jamming. Movable knife does not pick up the thread. Adjust the position of the shuttle race thread guide. Adjust the needle bar lift amount. The movable knife does not pick up the thread because of skipped stitches at Refer to "Skipped stitches occur". the sewing end. Movable knife position is incorrect. Adjust the position of the movable knife. Sub-tension is too weak. Turn the sub-tension nut to adjust the tension. Thread take-up spring tension and Adjust the tension and height of the height are incorrect. thread take-up spring. Incorrect needle and rotary hook timing. Adjust the needle bar lift amount. Shuttle race thread guide is not Adjust the position of the shuttle race separating the threads. thread guide. Poor seam finish on reverse side of material. Shuttle race thread guide is separating the threads insufficiently. Adjust the position of the shuttle race thread guide. Upper thread is not properly tight. Adjust the upper thread tension. P. 68 P. 67 P. 66 P. 77 P. 68 P. 30 P. 64 P. 66 P. 67 P. 67 P. 63 Uneven needle thread. Adjust the sub-tension. P. 30 Incorrect thread tightness. Needle thread is too long. Needle is striking the button. (BE-438F) Adjust the sub-tension. Turn the tension nut to adjust the upper thread trailing length to 35 - 38 mm. Refer to "5-5. Checking the sewing pattern". Upper thread tension is too weak. Adjust the upper thread tension. P. 30 P. 42 P. 63 Lower thread tension is too weak. Adjust the lower thread tension. Machine does not operate when power is turned on and foot switch is depressed. Thread take-up spring tension and Adjust the tension and height of the height are incorrect. thread take-up spring. Check if the machine head switch cord is disconnected. Machine head switch does not work. Adjust the position of the switching plate. Replace the machine head switch if it is broken. P. 63 P. 64 P. 17 P. 25 KE-430F, BE-438F 78

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11. TROUBLESHOOTING
78
KE-430F, BE-438F
Problem
Cause
Remedy
Ref.
Movable knife is blunt.
Replace the movable knife.
P. 68
Fixed knife is blunt.
Sharpen or replace the fixed knife.
P. 68
Adjust the position of the shuttle race
thread guide.
P. 67
Movable knife does not pick up the
thread.
Adjust the needle bar lift amount.
P. 66
The movable knife does not pick up the
thread because of skipped stitches at
the sewing end.
Refer to “Skipped stitches occur”.
P. 77
Movable knife position is incorrect.
Adjust the position of the movable
knife.
P. 68
Upper
thread
is
not
trimmed.
Sub-tension is too weak.
Turn the sub-tension nut to adjust the
tension.
P. 30
Thread take-up spring tension and
height are incorrect.
Adjust the tension and height of the
thread take-up spring.
P. 64
Incorrect needle and rotary hook timing.
Adjust the needle bar lift amount.
P. 66
Thread jamming.
Shuttle
race
thread
guide
is
not
separating the threads.
Adjust the position of the shuttle race
thread guide.
P. 67
Shuttle race thread guide is separating
the threads insufficiently.
Adjust the position of the shuttle race
thread guide.
P. 67
Upper thread is not properly tight.
Adjust the upper thread tension.
P. 63
Uneven needle thread.
Adjust the sub-tension.
P. 30
Needle thread is too long.
Adjust the sub-tension.
<When using the thread nipper
device>
Turn the tension nut to adjust the upper
thread trailing length to 35 – 38 mm.
P. 30
Poor seam finish on
reverse
side
of
material.
Needle is striking the button. (BE-438F)
Refer to “5-5. Checking the sewing
pattern”.
P. 42
Upper thread tension is too weak.
Adjust the upper thread tension.
P. 63
Lower thread tension is too weak.
Adjust the lower thread tension.
P. 63
Incorrect thread
tightness.
Thread take-up spring tension and
height are incorrect.
Adjust the tension and height of the
thread take-up spring.
P. 64
Check if the machine head switch cord
is disconnected.
P. 17
Adjust the position of the switching
plate.
P. 25
Machine does not
operate when power is
turned on and foot
switch is depressed.
Machine head switch does not work.
Replace the machine head switch if it is
broken.