Unicorn DB2-H515, Руководство по эксплуатации

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P roblem Cau se Ch eck Solu tio n Page
Thread fraying or
breakage
Burr in thread path ―
Remove with
sandpaper.
Blunt needle tip ― Replace needle. 7
Skipped stit ches
Improper needle
installation
Needle facing, height Reinstall needle. 7
Wrong needle for
application
Needle size, length
Replace needle with
larger count needle.
Bent needle
Blunt tip
Needle Replace needle. 7
Blunt rotary hook point Rotary hook point Replace rotary hook
Improper threading Threading Rethread. 9
Poo r p resser foot
contact
Presser bar pressure
Tighten presser foot
adjustment screw.
Presser bar height
Adjust presser bar
height
Improper needle to rotary
hook timing
Needle bar rise
Adjusting the rotary
hook timing
20
Needle bar height
Adjusting the rotary
hook timing
20
Needle to rotary
hook timing Adjusting the rotary
hook timing
20
Needle thread remainder
too short; does not
remain in material.
― Adjust pretension. 13
Bobbin spins during
thread cutting and
bobbin thread remainder
gets too short; won't
rise.
Bobbin presser
spring
Replace bobbin
presser spring.
Thread take-up spring
tension too weak, won't
raise bobbin thread.
Thread take-up
spring tension
Adjust take-up spring
tension
16
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