Unicorn DB2-H515 - Page 35

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TROUBLESHOOTING GUIDE
Probl em Cause Che ck Solu tion Page
Needle breakage
Improper needle
installation
Needle facing, height Reinstall needle. 7
Bent needle
Blunt needle tip
Jammed eye
Needle Replace needle 7
Improper needle to
rotary hook timing
Needle bar stroke
Adjust thread wiper
position with screw.
20
Needle bar height
Adjust thread wiper
position with screw.
20
Needle to rotary
hook gap
Adjust thread wiper
position with screw.
20
Thread wiper too high
Thread wiper
position
Adjust thread wiper
position with screw.
10
Thread break age
Improper threading Threading Rethread. 9
Bent needle
Blunt needle tip
Jammed eye
Needle Replace needle 7
Improper needle
installation
Needle facing, height Reinstall needle. 7
Excessive needle
thread tension
Needle thread
tension
Adjust needle thread
tension.
12
Excessive bobbin
thread tension
Bobbin thread
tension
Adjust bobbin thread
tension.
12
Loose needle thread
Thread take-up
spring operation
Adjust thread take-up
spring.
16
Insufficient rotary hook
lubrication
Oil supply Adjust oil supply. 23
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