Brother International LK3-B438E MKII Instruction Manual - English - Page 58

TROUBLESHOOTING, Refer to Skipped

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16. TROUBLESHOOTING Problem Cause Check 16. TROUBLESHOOTING Remedy Page Button clamp does not rise. Button clamp lifter amount is too great. Presser is contacting thread wiper. Distance between Adjust the height of button clamp and top the button clamp to 34 of needle plate within 17 mm. Thread wiper standby position Adjust the position of the thread wiper. 36 Button clamp does not drop. Presser lifter link is not moving back. Link return spring is unhooked. Hook the link return spring properly. Button clamp lift amount is incorrect. Incorrect position of button clamp holder hook assembly Distance between button clamp and top of needle plate Adjust the button clamp lift amount. 34 Thread wiper does not operate correctly. The thread wiper is obstructing the needle. Thread wiper position is incorrect. Clearance beween thread wiper and needle tip Thread wiper position Adjust the height of the thread wiper. 36 Adjust the operating distance of the thread 36 wiper. Lower thread winds to one side. Bobbin winder thread tension stud height is incorrect. Bobbin winder thread tension stud height Adjust the height of the thread tension stud. 22 Lower thread winding amount is incorrect. Bobbin presser position is incorrect. Thread winding amount Adjust the position of the bobbin presser. 22 Stitches being skipped at the sewing start. Refer to "Skipped stitches occur" Refer to "Skipped stitches occer". Threads comes unthreaded. Uneven upper thread length. Upper thread length Adjust the subtension. 23 Upper thread is too short. Thread take-up lever Adjust the thread 32 stroke take-up lever stroke. LK3-B438E Mark II 52

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52
LK3-B438E Mark II
16. TROUBLESHOOTING
16. TROUBLESHOOTING
Problem
Cause
Check
Remedy
Page
Button clamp does
not rise.
Button clamp does
not drop.
Button clamp lift
amount is incorrect.
Button clamp lifter
amount is too great.
Distance between
button clamp and top
of needle plate
Adjust the height of
the button clamp to
within 17 mm.
34
Presser is contacting
thread wiper.
Thread wiper standby
position
Adjust the position of
the thread wiper.
36
Presser lifter link is
not moving back.
Link return spring is
unhooked.
Hook the link return
spring properly.
Incorrect position of
button clamp holder
hook assembly
Distance between
button clamp and top
of needle plate
Adjust the button
clamp lift amount.
34
Thread wiper does
not operate correctly.
The thread wiper is
obstructing the
needle.
Clearance beween
thread wiper and
needle tip
Adjust the height of
the thread wiper.
36
Thread wiper
position is incorrect.
Thread wiper
position
Adjust the operating
distance of the thread
wiper.
36
Lower thread winds
to one side.
Bobbin winder thread
tension stud height is
incorrect.
Bobbin winder thread
tension stud height
Adjust the height of
the thread tension
stud.
22
Lower thread
winding amount is
incorrect.
Bobbin presser
position is incorrect.
Thread winding
amount
Adjust the position of
the bobbin presser.
22
Stitches being
skipped at the sewing
start.
Refer to "Skipped
stitches occur"
Refer to "Skipped
stitches occer".
Threads comes
unthreaded.
Uneven upper thread
length.
Upper thread length
Adjust the sub-
tension.
23
Upper thread is too
short.
Thread take-up lever
stroke
Adjust the thread
take-up lever stroke.
32