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Trouble
Cause (1)
Cause (2)
Check and corrective measures
From the previous page
From the previous page
7-D) The bobbin thread idles in the
bobbin case.
Adjust the tension of the idling prevention
spring with reference to "3.-(4)."
7-E)
The bobbin has a flaw.
Remove a burr at the flaw portion, or replace
the bobbin.
3-8) Feeding is inappropriate.
8-A) The timing of feeding is inap-
propriate, or the height of the
feed dog is too low.
Set the feed timing to a level slightly later than
standard (for cotton or spun thread). Set the
feed timing to a level earlier than standard (for
filament thread). Lift the feed dog height.
3-9) Pressing is inappropriate.
9-A)
The presser is floating.
Adjust the clearance between the presser bar
holder and lifting plate. (The clearance shall be
within 0.8 to 1.2mm when the presser is close-
ly contacted with the throat plate.
9-B) The presser foot sole has little
or no relief (for thicker thread or
larger stitch length).
Use a foot with a large thread relief on the
backside.
3-10) The thread tension device is
defective.
10-A)
The thread tension disk is float
-
ing.
Adjust the timing of the thread tension disk
floating with reference to "3.-(9)-6."
3-11) The needle hole of the throat
plate is too small.
Use a throat plate with a larger needle hole.
3-12) The needle is too thin for the
thread to be used.
Change the needle or thread to be used.
3-13) The needle is defective.
13-A) A burr exists on the tip of the
needle.
Replace the needle.
Содержание DDL-8000A
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