Janome Quilt Maker Pro 18 VERSA Service Manual page 54

Bobbin case is damaged,
corroded, dirty, etc.
Moving the quilt too fast
for needle speed selected
(Manual mode)
Tension is Poor
Lint caught under the tension
spring in the bobbin
Hand Wheel Won't Rotate
Thread is entangled and caught in
the hook, creating a thread lock
Thread Nests Under Quilt
Not enough tension on top
thread
Improper threading
Thread Backlash
Page 54
• Since thread slides over the surface of the bobbin case at a high
speed, make sure the case is free of any lint or foreign matter that
could impede thread passage through the machine .
• Synchronize quilt movement and needle speed to get your desired
stitch length. Elongated stitches are an indication of moving the
quilt too fast for the current speed.
Corrective Measure(s)
• If using short-staple threads, inexpensive threads, industrial
threads, or coated threads, lint and other material will build up
under the tension spring and begin to lift the spring, reducing the
spring's ability to compress against the thread. Insert a pin or the
corner of a business card under the spring and clear out the lint.
The bobbin tension will return fairly close to its preset tension.
Test the tension before quilting.
Corrective Measure(s)
• Carefully rock or turn the hand wheel in direction of motion and
then the other direction until the thread lock breaks free. Once
the hand wheel can be turned freely, remove the thread from
the hook and basket. Now re-oil the hook and make sure the
hand wheel turns freely without the hook hitting the needle. It is
possible for a thread lock to cause a timing problem.
Corrective Measure(s)
• Check that the machine is threaded correctly. Make certain that
the thread is flossed snugly in place between the two tension
discs. If the machine is threaded correctly, tighten top tension by
rotating the tension knob clockwise. (For more information about
adjusting tension, see Bobbin and Bobbin Tension and Easy-Touch
Tension™ in the Using Your Machine section of this manual.)
• Refer to threading diagram and threading instructions.
Corrective Measure(s)
Quit Maker Pro 18 VERSA