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5-4) The needle is defective.
4-A) The needle is bent.
Replace the needle.
4-B) The needle has a flaw.
Replace the needle.
4-C) The needle tip is blunt.
Replace the needle.
4-D) The needle mounting direction
Mount the needle appropriately. Defective sewing is likely
is inappropriate.
to occur when the needle recess portion faces frontward.
4-E) The needle is too thin or thick
Replace the needle.
for the thread to be used.
4-F) The needle tip is too sharp.
Use a ballpoint needle.
5-5) The matters related to the hook
5-A) The thread path of the hook has
Replace the needle.
are inappropriate.
a flaw.
5-B) The blade top of the hook is
Sharpen the blade top of the hook or replace the needle.
blunt or worn.
5-C) The clearance between the hook
Increase the clearance to smooth the thread passing.
and inner hook presser is too small.
5-D) Hook oil is insufficient.
Adjust the hook oil volume to the appropriate level.
5-6) The matters related to the hook
6-A) The thread path of the hook has
Replace the needle.
are inappropriate.
a flaw.
6. Thread breakage at back or back-tuck
6-1) The needle mounting direction
1-A) The needle mounting direction
Mount the needle so that the needle recess portion faces
sewing
is inappropriate.
is inappropriate.
in the direction of slightly opposite side of the operator
(approx. 10 degrees) from the exactly lateral direction.
1-B) The thread take-up spring is
Adjust the thread take-up spring so that the thread is not fed
inappropriately adjusted.
from the thread tension disk before the thread take-up
spring moves to the end. (The more effective this adjustment
becomes, the lower the spring tension is set or the longer
the stroke of the spring is set.)
Wind the thread around the needle or use the T-type needle
bar thread guide (B1418227T00).
Trouble
Case (1)
Case (2)
Check and Corrective measures
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Summary of Contents for DDL-9000A
Page 14: ... 10 4 Feed locus and phase 1 Timing standard 2 Timing fast 3 Timing slow Standard Adjustment ...
Page 32: ... 28 8 Adjustment of the amount of feeding 4 Optional switch Standard Adjustment ...
Page 60: ... 56 11 Thread trimming unit 7 Replacement of the moving knife Standard Adjustment ...
Page 66: ... 62 11 Thread trimming unit 10 Adjustment of the drive arm stopper Standard Adjustment ...
Page 70: ... 66 12 Adjustment of the wiper DDL 9000A WB OB 2mm 1mm Standard Adjustment ...
Page 72: ... 68 13 Adjustment of feed lever pressure B A Feed lever Standard Adjustment ...
Page 112: ...MEMO ...
