JUKI HZL-35Z Instruction Manual page 74

4. CHECK CHART FOR PERFORMANCE PROBLEMS
72
GENERAL PROBLEMS
Machine does not sew.
* Foot controller is not connected. - See page 12 - 13.
* Power switch is turned off. - Turn on the switch.
Machine jams/knocks.
* Thread is caught in shuttle. - Clean shuttle
(see page 68 - 69).
* Needle is damaged. - Replace needle
(see page 24 - 25).
Fabric does not move.
* Presser foot is not lowered. - Lower presser foot.
* Stitch length is set at 0. - Set it at 1 to 4.
STITCHING PROBLEMS
Machine skips stitches.
* Needle is not all the way up into needle clamp. - See
page 24 - 25.
* Needle is bent or blunt. - Replace needle
(see page 24 - 25).
* Machine is not threaded correctly. - See page
26 - 27.
* Thread is caught in shuttle. - Clean shuttle
(see page 68 - 69).
* Fabric is a certain knit or synthetic. - Use stretch
stitch needle (see page 24 - 25).
Stitches are irregular.
* Needle size is not correct for thread and fabric.
- See page 24 - 25.
* Machine is not threaded correctly. - See page
26 - 27.
* Top thread tension is too loose. - See page
44 - 45.
* Fabric is being pulled or pushed against machine
feeding action. - Guide it gently.
* Bobbin has not been wound evenly. - Rewind bobbin.
Needle breaks.
* Fabric is being pulled or pushed against machine
feeding action. - Guide it gently.
* Needle size is not correct for thread and fabric.
- See page 24 - 25.
* Needle is not all the way up into the needle clamp
(See page 24 - 25).
THREAD PROBLEMS
Thread bunches.
* Top and bobbin threads are not drawn back under
presser foot before starting seam.
- Draw both threads back under presser foot about 4
inches (10 cm) and hold until a few stitches are
formed.
Needle thread breaks.
* Machine is not threaded correctly. - See page 26 - 27.
* Top thread tension is too tight. - See page 44 - 45.
* Needle is bent. - Replace needle (see page 24 - 25).
* Needle size is not correct for thread and fabric.
- See page 24 - 25.
Bobbin thread breaks.
* Bobbin case is not threaded correctly. - See page
22 - 23.
* Lint accumulates in bobbin case or shuttle.
- Remove lint (see page 68 - 69)
Fabric puckers.
* Top thread tension is too tight. - Adjust thread tension
(see page 44 - 45).
* Stitch length is too long for sheer or soft fabric.
- Shorten stitch length.