12. TROUBLESHOOTING
RH-9820
122
12. TROUBLESHOOTING
•
If there is a problem with operation, first check that the threads are correctly threaded and that the needle is correctly
installed.
•
Please check the following points before calling for repairs or service.
•
If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of
purchase.
CAUTION
Turn off the power switch and disconnect the power cord before carrying out troubleshooting.
Otherwise the machine may operate if the start switch is pressed by mistake, which could result in serious injury.
Problem Cause
Remedy
Page
Thread tension is too strong.
Adjust the thread tension to the correct
tension.
55
Needle is not installed correctly.
Install the needle so that it faces
correctly.
30
Thread is too thick for the needle.
Select a thread which is suitable for the
needle.
55
Needle and looper adjustment is
incorrect.
Adjust the clearance between the
needle and looper, the needle bar height
or the looper and spreader height.
71, 78
79
Needle, looper, spreader, throat plate or
thread path is damaged.
Repair or replace the respective part(s).
Thread breaks
Thread is not threaded correctly.
Thread the thread correctly.
31 - 34
Upper thread tension is too strong or too
weak.
Adjust the upper thread tension to the
correct tension.
55
Needle point is broken or bent.
Replace with a new needle.
30
Clearance between needle and looper
tip is incorrect.
Adjust the clearance between the
needle and looper tip.
79
Needle, looper and spreader adjustment
is incorrect.
Adjust correctly.
71
76 - 81
Needle and needle guard adjustment is
incorrect.
Adjust the needle guard.
79
Looper tip is blunt.
Repair with an oilstone or replace the
looper with a new one.
Needle is not installed correctly.
Install the needle so that it faces
correctly.
30
Skipped stitches occur.
Needle is too thin.
Select a needle that is suitable for the
sewing conditions.
55
Содержание RH-9820
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