B.
TROUBLES
AND
CHECK
POINTS
CORRECTION
I
TROUBLE AND CAUSE
(1) Incorrect setting of the needle
(2)
Bent or blunt needle
(3) 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
(5) lmproper height of feed dog
3.
BREAKING NEEDLE
1.
SKIPPING STITCHES
Refer to:
INSTRUCTION BOOK or:
(1
)
Improper positioning of needle plate
(1) Incorrect setting of the needle
(
TO CHANGE THE NEEDLE
I
I
Refer to: SERVICE MANUAL (Item No.)
following models
2.
MATERIAL NOT FEEDING
TO CHANGE THE NEEDLE
TO CHECK THE NEEDLE
UPPER THREADING
TO CHANGE NEEDLE PLATE
VX511. VX541. VX561. VX581. VX611. VX641. VX661
VX681, VX710, VX720. VX740. VX760. VX780
2
3- 1
4
-
1
(3) Improper clearance between the needle and
shuttle hook
(4) Improper
max. needle swing
(5) lmproper swing timing of the needle
VX516, VX546. VX566. VX586
VX616. VXM6. VX666. VX686
2
3
-
2
4
-
2
---
2
3 41
1
3
-
2
&
4
-
2
vX710
16
-
1
18
-
1
-541.
VX611, VX616
--
16
-
2
18
-
2
VX561. VX581. VX546, VX566. VX586. VX641. VX661
VX681. VX646, VX666. VX686, VX720. VX740. -760. VX780
-
16
-
3
18
-
3
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