Baby Lock Altair 2, Инструкция и справочник

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TROUBLESHOOTING
187
A
PPE
N
D
IX
7

Cause
Incorrect bobbin threading
If the bobbin thread is incorrectly threaded, instead of the
appropriate tension being applied to the bobbin thread, it
is pulled through the fabric when the upper thread is
pulled up. For this reason, the thread is visible from the
right side of the fabric.

Remedy
Correctly install the bobbin thread. (page 39)
Tangled Thread on Wrong Side of Fabric

Symptom
* The thread becomes tangled on the wrong side of
the fabric.
* After starting sewing, a rattling noise is made and
sewing cannot continue.
* Looking under the fabric, there is tangled thread in
the bobbin case.

Cause
Incorrect upper threading
If the upper thread is incorrectly threaded, the upper
thread passed through the fabric cannot be firmly pulled
up and the upper thread becomes tangled in the bobbin
case, causing a rattling noise.

Remedy
Remove the tangled thread, and then correct the upper
threading.
a
Remove the tangled thread. If it cannot be removed,
cut the thread with scissors.
* Refer to “Cleaning the Race” on page 183.
b
Remove the upper thread from the machine.
c
Correct the upper threading by following the
instructions in “Upper Threading” on page 41.
* If the bobbin was removed from the bobbin case,
refer to “Setting the Bobbin” on page 39 to correctly
install the bobbin.
Incorrect Thread Tension
 Symptoms
• Symptom 1: The bobbin thread is visible from the
right side of the fabric.
• Symptom 2: The upper thread appears as a straight
line on the right side of the fabric.
• Symptom 3: The upper thread is visible from the
wrong side of the fabric.
• Symptom 4: The bobbin thread appears as a straight
line on the wrong side of the fabric.
• Symptom 5: The stitching on the wrong side of the
fabric is loose or has slack.
1
Wrong side of fabric
2
Bobbin thread visible on right side of fabric
3
Upper thread
4
Right side of fabric
5
Bobbin thread
6
Upper thread visible from wrong side of fabric

Cause/Remedy

Cause 1
The machine is not correctly threaded.
<With symptoms 1 and 2 described above>
The bobbin threading is incorrect.
Return the upper thread tension to the standard setting,
and then refer to “Setting the Bobbin” on page 39 to
correct lower threading.
<With symptoms 3 through 5 described above>
The upper threading is incorrect.
Return the upper thread tension to the standard setting,
and then refer to “UPPER THREADING” on page 41 to
correct the upper threading.

Cause 2
A needle and thread appropriate for the fabric are not
being used.
The machine needle that should be used depends on the
type of fabric sewn and the thread thickness.
If a needle and thread appropriate for the fabric are not
being used, the thread tension will not be adjusted
correctly, causing wrinkles in the fabric or skipped
stitches.
* Refer to “FABRIC/THREAD/NEEDLE
COMBINATIONS” on page 48 to check that a
needle and thread appropriate for the fabric are
being used.

Cause 3
An appropriate upper tension is not selected.
Select an appropriate thread tension. Refer to “Setting the
Thread Tension” on page 62.
The appropriate thread tension differs according to the
type of fabric and thread being used.

Symptom 1

Symptom 3
a
b
c
d
e
a
c
d
e
f