Mitsubishi PLK-E2010R User Manual

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9. BAD SEWING CONDITION & ITS CAUSE AND REMEDY
NOTE Please fix the troubles during the sewing machine operation with referring to the following
instructions.
Beside, if the trouble conditions are not coming under these classification, please contact the sewing
machine dealers nearby.
Bad condition Cause Remedy
Ref. page &
Item
Poor thread quality Use better quality thread ---
Tight upper thread tension Adjust thread tension P19-6-3-2)
strong thread take up spring Adjust thread take up spring
properly
P36-7-14
Upper thread is thicker than needle
size
Change needle to suitable size
---
Damages on rotating hook Change them new ones or grind
them with buffing wheel or grind
stone
---
Damages inside needle plate needle
hole
Change it new one or grind it with
buffing wheel
---
Damages inside presser foot needle
hole
Change it new one or grind it with
buffing wheel
---
Needle touches with presser foot
needle hole
Move presser foot position
---
Needle and rotating hook are not in
proper timing
Adjust the timing
---
Slow down sewing speed P18-4)
Use silicon oil ---
1.
Upper thread
breakage often
happens
Thread melts with needle heat
Use needle cooler ---
Thread tension discs are not opened
at trimming
Adjust thread tension release
P35-7-10
Thread take up spring swings too
much
Adjust thread take up spring’s
swing stroke
P36-7-13
Needle size is bigger than thread size Change needle to suitable size ---
Pre-tension is too tight Adjust pre-tension P36-7-11
Thread guide is in wrong position Adjust thread guide position
properly
P35-4)
Needle and rotating hook are in bad
timing
Adjust the position properly
P21-7-2
Adjust trimmer cam position P32-7-9-2.6
Adjust movable knife position P34-7-9-2.7
2.
Upper thread is
pulled out from
needle
Trimmer timing is not correct
Adjust synchronizer position P37-7-15
Too short bobbin thread by bobbin
spinning at trimming
Use non racing spring with bobbin
---
Bobbin thread tension is too tight Loosen bobbin thread tension
spring
P19-6-3-1)
Decrease pre-tension P36-7-11
Adjust trimmer cam position P32-7-9-2.6
Adjust synchronizer position P37-7-15
Make thread take up swing stroke
smaller
P36-7-13
Advance thread tension release
timing
Control unit
Adjust thread guide position
properly
P35-4)
3.
Skip stitch
happens at start
sewing
Thread tail from needle is very short
after trimming
Adjust the position properly P21-7-2

Mitsubishi PLK-E2010R Specifications

General

Brand	Mitsubishi
Model	PLK-E2010R
Category	Sewing Machine
Language	English