Brother International BAS-705 Instruction Manual - English - Page 77

TROUBLESHOOTING, 10-1. Machine Head

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10. TROUBLESHOOTING 10. TROUBLESHOOTING 10-1. Machine Head Problem Cause Check Remedy Page Presser does not rise. Thread wiper does not operate correctly. Lower thread winds to one side. Lower thread winding amount is incorrect. Threads comes unthreaded. Lower thread breaks. Presser lifter air tube is bent or damaged. Presser lifter air tube is bent or damaged. Presser is contacting thread wiper. Presser lifter air tube Presser lifter air tube Thread wiper standby position Straighten the bend in the tube or replace the tube.  7 Straighten the bend in the tube or replace the tube. 7 Adjust the position of the thread wiper. 45 The thread wiper is obstructing the needle. Thread wiper position is incorrect. Bobbin winder thread tension stud height is incorrect. Clearance between thread wiper and needle tip Thread wiper position Bobbin winder thread tension stud height Adjust the height of the thread wiper. 45 Adjust the operating distance of the thread 45 wiper. Adjust the height of the thread tension stud. 26 Bobbin presser position is incorrect. Thread winding amount Adjust the position of the bobbin presser. 26 Stitches being skipped at the sewing start. Uneven upper thread length. Needle is too thick for the thread. Incorrect height or tension of thread take-up spring. Refer to "Skipped stitches occur". Upper thread length Thread and needle Tension and height of thread take-up spring Lower thread tension is too strong. Damaged or burred needle hole plate, bobbin case corner, shuttle race thread guide or shuttle race. Tension of bobbin presser spring in bobbin case is too strong. Lower thread winding method is incorrect. Lower thread tension Damage Bending amount of bobbin presser spring Lower thread tension Refer to "Skipped stitches occur". Adjust the sub-tension. 28 Select a needle that matches the thread. Check that the thread path. gives the 28 correct amount of resistance to the thread. Increase the tension or lower the height of the 29 thread take-up pring. Adjust the lower thread tension. 28 File smooth or replace the affected part. Reduce the tension of the bobbin presser spring. 28 Adjust the lower thread tension. 26.28 ʕ 74 ʕ B A S -705

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10. TROUBLESHOOTING
10. TROUBLESHOOTING
10-1. Machine Head
―
74
―
BAS-705
Thread winding amount
Upper thread length
Refer to "Skipped
stitches occur".
Bobbin winder thread
tension stud height
Thread wiper position
Clearance between
thread wiper and needle
tip
Thread wiper standby
position
Presser lifter air tube
Presser lifter air tube
�
�
Presser lifter air tube is
bent or damaged.
Presser lifter air tube is
bent or damaged.
Presser is contacting
thread wiper.
The thread wiper is
obstructing the needle.
Thread wiper position is
incorrect.
Bobbin winder thread
tension stud height is
incorrect.
Bobbin presser position
is incorrect.
Stitches being skipped
at the sewing start.
Uneven upper thread
length.
Lower thread winds to
one side.
Adjust the height of the
thread tension stud.
26
Adjust the position of the
bobbin presser.
26
Refer to "Skipped
stitches occur".
�
Adjust the sub-tension.
28
28
Adjust the operating
distance of the thread
wiper.
45
Adjust the height of the
thread wiper.
45
Adjust the position of the
thread wiper.
45
Straighten the bend in the
tube or replace the tube.
7
Straighten the bend in the
tube or replace the tube.
7
�
Page
Thread wiper does not
operate correctly.
Presser does not rise.
�
Problem
Lower thread winding
amount is incorrect.
Cause
Check
Remedy
Threads comes
unthreaded.
�
�
�
Tension and height of
thread take-up spring
Thread and needle
Needle is too thick for
the thread.
Incorrect height or tension
of thread take-up spring.
Select a needle that matches the thread.
Check that the thread path. gives the
correct amount of resistance to the thread.
Increase the tension or
lower the height of the
thread take-up pring.
29
Damage
Lower thread tension
Lower thread tension is
too strong.
Damaged or burred needle hole
plate, bobbin case corner, shuttle
race thread guide or shuttle race.
Adjust the lower thread
tension.
28
File smooth or replace
the affected part.
�
Lower thread breaks.
Lower thread tension
Bending amount of
bobbin presser spring
Tension of bobbin
presser spring in bobbin
case is too strong.
Lower thread winding
method is incorrect.
Reduce the tension of
the bobbin presser spring.
28
Adjust the lower thread
tension.
26.28