42 –MACHINE MAINTENANCE
Irregular Stitches
Possible Cause:
Stitches are not balanced.
Solution:
Adjust thread tensions and possibly cutting width (page 26,
27)
Possible Cause:
Thread is not unreeling smoothly off the thread spool.
Solution:
Check the thread spool to ensure thread is not getting
caught.
Possible Cause:
Machine may not be threaded correctly or threads threaded in the incorrect sequence.
Solution:
Check that machine is threaded in correct order as shown in machine manual (page 12)
Fabric Jams
Possible Cause:
Upper and lower fabric cutters are not in proper position.
Solution:
Check alignment of cutters (page 26).
Possible Cause:
Thread is not unreeling smoothly off the thread spool.
Solution:
Check the thread spool to ensure thread is not getting caught.
Possible Cause:
Too much fabric thickness.
Solution
:
Compress thick layers with conventional sewing machine before sewing on overlock.
The Looper Threader does not Work
Possible Cause:
The Threading/Sewing switch is not set to the “Threading” position.
Solution:
Set the Threading/Sewing switch to threading position (page 15, 17).
Possible Cause:
The looper selection lever is not set correctly.
Solution:
Make sure the looper selection lever is pointing to the correct looper (page 15, 17).
Possible Cause:
The thread is not correctly inserted into the looper threader hole.
Solution
:
Insert at least 2cm of thread into the looper hole (page 15, 17).
Possible Cause:
The thread is not long enough.
Solution
:
Pull out approximately 12” (30 cm) of thread before putting it in the looper threading hole (page 15, 17).
Possible Cause:
The thread is tangled, wet or frayed.
Solution
:
Trim the thread end.
Possible Cause:
Lint is accumulated in the looper threader pipe.
Solution
:
Clean the looper threading pipe (page 38).
The Needle Threader does not Work
Possible Cause:
The mark on the side cover is not aligned with the mark on the handwheel.
Solution:
Set the handwheel in threading position (page 8, 15, 17).
Possible Cause:
The needle threader switch is not set correctly.
Solution:
Set the needle threader switch to “R“ when threading the right needle and “L“ when threading the
left needle (page 24).
Possible Cause:
The needle threader is not used correctly.
Solution
:
See page 24 for instructions on how to use the needle threader.
Specifications
Sewing Speed
Maximum 1300 rpm
Number of Needles/Needles
1-2 of type HAx1SP, size: #11-14
Stitch Length
1-5 mm
Stitch Width
3.3-7.5 mm
Number of Threads
2, 3, 4
Differential Feed Ratio
0.5-2.0
Type of Lamp
LED light
Needle Bar Stroke
26.5 mm
Machine Dimensions
Width: 351 mm
Depth: 284 mm
Height: 299 mm
Presser Foot Rise
5-7 mm
Weight
7.8 kg
Summary of Contents for Viking Amber Air S 400
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