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Problem
11. Broken needles
12. Incorrect thread trimming
(upper and lower threads
are both not being
trimmed). (B856E)
13. Incorrect thread trimming
(upper thread or lower
thread is not being
trimmed). (B856E)
14. The thread wiper does not
wipe the thread.
(B856E-40 □ , 90 □ )
16-2. Operation panel
Problem
1. Operation panel keys do
not operate.
Possible cause
• Is the material being pushed or pulled with excessive force dur-
ing sewing?
• Is the needle properly installed?
If it is incorrect, install the needle correctly.
• Is the needle bent, is the needle tip broken, or is the needle hole
blocked?
Replace the needle.
• Is the needle and rotary hook timing incorrect?
Adjust the height of the needle bar.
Adjust the clearance between the needle and the rotary hook.
Caution
• It is extremely dangerous to leave any pieces of broken
needle sticking in the material. If the needle breaks, search
for all pieces until the whole of the needle is found again.
• Furthermore, we recommend that through steps be taken to
account for such needles to comply with product liability
regulations.
• Is the fixed knife or movable knife damaged or worn?
Replace the fixed knife or the movable knife.
• Is the thread trimming timing correct?
Adjust the rotating direction of the thread trimming cam.
• Is the neelde properly installed?
If it is incorrect, install the needle correclty.
• Is the fixed knife or movable knife blunt?
Replace the fixed knife or the movable knife.
• Do skipped stitches occur during sewing?
Refer to "Skipped stitches during sewing".
• Is the length of thread trailing from the needle hole too long
after thread trimming?
Adjust the upper thread feeding device.
Possible cause
• Is `|| appearing in the LED display?
If this display appears, key operation has been locked because
of a DIP switch setting, so the keys cannot be operated.
LZ2-B855E,B856E
16. TROUBLESHOOTING
16. FEHLERSUCHE
16. RESOLUTION DES PROBLEMES
16. LOCALIZACION DE AVERIAS
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