Brother EF4-V41 - ( Troubleshooting ); [)] Needle Thread Breakage (Overlockingl

( TROUBLESHOOTING )
[)] Needle thread breakage (overlockingl
PROBLEM
ADJUSTMENT
(i) Incorrect threading. ~ Refer to nThreading diagram. n
® Excessive pressure of tension disk. ~ Adjust to suitable pressure.
® Poor thread quality. ~ Use thread of good quality.
® Needle groove or needle eye poorly finished. ~ Change needle for a good one.
® Incorrect looper thread take-up position. ~ Adjust to proper position.
@ Thread passage has flaws. ~ Change part with new one.
(/) Needle plate has flaws. ~ Replace it with new one, or smooth or buff surface with oil and stone.
® Under looper has flaws.
® Incorrect timing of needle and looper.
Flaws~
r '-Burr
~ Replace it with new one, or smooth or buff surface with oil and stone.
~ Adjust to correct timing, needle clearance and position of needle guard.
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From the library of: Superior Sewing Machine & Supply LLC