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10. TROUBLESHOOTING
PR OBLEM
POSSIBLE CAU SE
PAGE
1.UPPER TH REA D IS NOT
TIGHT.
․Is the upper threa d tension too wea k, or is the l ower
tension too strong?
-> Adjust the upper thread tension or lower thread
tension.
13
․Is the pos ition of the upper thread take-up threa d
guide incorrect?.
-> Adjust the tension pl ate clearance of the upper
threa d nipper correctl y.
19
2. Sk ipped s titches occur
whil e sewing
․Is the needle properl y instal led?
-> If it is incorrect, ins ta ll the needle correctly.
9
․Are the l ooper points dull?
-> Repla ce l oopers with good ones.
16
․Is the needle a nd looper timing incorrect?
-> Adjust the needl e and looper timing correctl y
16
․Is the lower threa d tak e-up timing correctl y?
-> Adjust the l ower thread take-up timing correctl y.
20
․Is the cl ea ra nce between needle a nd looper incorrect?
-> Adjust the clearance between needles a nd loopers
correctl y.
16
3. Sea m position is incorrect.
(Machines with pul ler)
․Is the pul ler timing incorrect?
-> Adjust the pull er timing.
․Is the pul ler feed incorrect?
-> Adjust the pull er feed.
․Is the presser foot pres sure incorrect?
-> Adjust the presser foot pressure.
13
․Is the lower threa d tak e-up timing incorrect?
-> Adjust the l ower thread take-up timing correctl y.
19
4. Sea m position is incorrect.
․Is the feed dog too low?
-> Adjust the feed dog height.
19
․Is the presser foot pres sure too s ma ll ?
-> Adjust the presser foot pressure.
13
․Is the feed dog worn out?
-> Ha ve servicemen check it.
․Presse r f oot f loats a nd does not f ull y pre sse r work.
-> Ha ve servicemen check it.
․F eed dog and presser foot work on one s ide only
-> Ha ve servicement check it.
Summary of Contents for DT6-H892?3
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