B. TROUBLES AND CHECK POINTS
CORRECTION
TROUBLE AND CAUSE
( 1 ) Incorrect setting of the needle
( 2 ) Bent or blunt needle
Incorrect upper threading
(4) Improper height of the needle bar
( 5 ) Improper clearance between the needle and
shuttle hook
( 6 ) Improper timing of needle and hook
(2) Light pressure on the presser foot
(3) lmproper positioning of feed cam
(4) lmproper positioning of vertical feed cam
lmproper height of feed dog
3. BREAKING NEEDLE
1.
SKIPPING STITCHES
Refer to:
INSTRUCTION BOOK or:
( 1 Improper positioning of needle plate
Incorrect setting of the needle
TO CHANGE THE NEEDLE
Refer t o : SERVICE M A N U A L (Item No.)
following models
2. MATERIAL NOT FEEDING
TO CHANGE THE NEEDLE
TO CHECK THE NEEDLE
UPPER THREADING
TO CHANGE NEEDLE PLATE
2
1
4- 1
( 3 ) Improper clearance between the needle and
shuttle hook
(4) Improper
needle swing
lmproper swing timing of the needle
2
3-2
4-2
2
3
4 1
3-2
4-2
16-1
18-1
16-2
18-2
16-3
18-3
