typical GC6760 SERIES, Руководство по установке, инструкции и обслуживанию

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TYPICAL GC6760 Series
11 // ERROR MESSAGES & POSSIBLE TROUBLESHOOTING
Check the following points before you send a service- or repair
request when you have problems with the machine. Switch the
machine of and contact a qualifi ed technician or your dealer if
you can not rectify the fault with the help of this instructions.
11/1 Loose upper thread tension
When the upper thread tension is to loose it can be, because
the upper tension is to loose, or the lower tension is to tight.
Check the upper and lower thread tension and readjust if
necessary. See point 7/1 and point 7/2 in this manual.
11/2 Loose lower thread tension
When the lower thread tension is to loose it can be, because
the lower tension is to loose, or the upper tension is to tight.
Check the lower and upper thread tension and readjust if
necessary. See point 7/1 and point 7/2 in this manual
11/3 Loops appear
When loops appear in the seam it can be possible, that
thread path is not smooth, or the bobbin is not turning evenly.
Polish the thread path with fi ne sandpaper or a
fi ne-grained fi le. Take the bobbin case out and check
thread tension. In case the bobbin or the bobbin case
is damaged replace it.
Caution
Switch the machine off and pull the plug. Wait for at least 5 minutes before you open the
front unit and control unit. This parts are under high voltage and contact may cause dangerous injuries.
Caution
Switch the machine off and pull the plug before you start looking for the fault.
Injury may occur when the machine is started accidently by pushing the foot pedal.