Pfaff coverstyle 4850 Owner's Manual - Page 65

Use needle system EL X 705.

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Sewing problems and their solutions This machine has been developed with ease of operation in mind. No difficult or tricky set tings need to be made. Sewing problems of the kind described below may occur as a result of minor adjustment and operating errors. They can be easily adjusted by following the in structions. Problem Needle breakage Thread breaks Cause The needle was bent or the point damaged. The needle was not fully inserted. The fabric was pulled too firmly. Incorrectly threaded. Thread has caught. Thread tension is too tight. Needle not fully insert. Solution Insert new needle (see page 13). Insert needle fully (see page 13). Do not pull on the fabric when sewing. Thread properly (see page 14 - 23). Check if the thread is caught on the spool stand etc. Correct the tension (see page 46 - 56). Insert needle correctly (see page 13). Incorrect needle used. Use needle system EL X 705. Skipping stitches Needle bent or point damage. Needle not fully inserted. Incorrect needle used. incorrectly threaded. Insert new needle (see page 13). Insert needle correctly (see page 13). Use needle system EL X 705. Thread properly (see page 14 - 23). Stitch formation faulty Incorrect setting of thread tension. Re-set thread tensions (see page 46 - 56). 3- or 4-thread overedge seam has an irregular appearance and the upper looper thread has not interlocked in the seam. The converter is attached. The converter must be removed (see page 32). Machine will not ope- Power supply interrupted. rate although master switch is on. Close looper cover (see page 8). Fabric not neatly trimmed Waste thread between upper and lower blade Upper blade is blunt. Clean blades. Replace upper blade (see page 59). Puckered seams Thread tension too tight. Incorrect setting of differential feed. Thread has caught due to incorrect threading Reduce thread tension. Re adjust differential feed (see pages 36, 37). Thread correctly (see pages 14 - 23). Fabric not fed through evenly Stitches too short. Sewing foot pressure too low for heavy fabrics. Sewing foot pressure too high for lightweight fabrics. Increase stitch length (see page 38). Increase sewing foot pressure (see page 28). Reduce sewing foot pressure (see page 28). 61

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61
Sewing problems and their solutions
This machine has been developed with ease of operation in mind. No dif
fi
cult or tricky set tings
need to be made. Sewing problems of the kind described below may occur as a result of minor
adjustment and operating errors. They can be easily adjusted by following the in structions.
Problem
Cause
Solution
Needle breakage
The needle was bent or the
point damaged.
The needle was not fully
inserted.
The fabric was pulled too
fi
rmly.
Insert new needle
(see page 13).
Insert needle fully
(see page 13).
Do not pull on the fabric when sewing.
Thread breaks
Incorrectly threaded.
Thread has caught.
Thread tension is too tight.
Needle not fully insert.
Incorrect needle used.
Thread properly (see page 14 - 23).
Check if the thread is caught on the
spool stand etc.
Correct the tension (see page 46 - 56).
Insert needle correctly (see page 13).
Use needle system EL X 705.
Skipping stitches
Needle bent or point damage.
Needle not fully inserted.
Incorrect needle used.
incorrectly threaded.
Insert new needle (see page 13).
Insert needle correctly (see page 13).
Use needle system EL X 705.
Thread properly (see page 14 - 23).
Stitch formation faulty
Incorrect setting of thread
tension.
Re-set thread tensions (see page 46
- 56).
3- or 4-thread
overedge seam has
an irregular
appearance and the
upper looper thread
has not interlocked in
the seam.
The converter is attached.
The converter must be removed
(see page 32).
Machine will not ope-
rate although master
switch is on.
Power supply interrupted.
Close looper cover (see page 8).
Fabric not neatly
trimmed
Waste thread between upper
and lower blade
Upper blade is blunt.
Clean blades.
Replace upper blade (see page 59).
Puckered seams
Thread tension too tight.
Incorrect setting of differen-
tial feed.
Thread has caught due to
incorrect threading
Reduce thread tension.
Re adjust differential feed
(see pages 36, 37).
Thread correctly (see pages 14 - 23).
Fabric not fed through
evenly
Stitches too short.
Sewing foot pressure too low
for heavy fabrics.
Sewing foot pressure too
high for lightweight fabrics.
Increase stitch length
(see page 38).
Increase sewing foot pressure
(see page 28).
Reduce sewing foot pressure
(see page 28).