Brother VX Series User manual

CONTENTS
page
A
. HOW TO USE THIS MANUAL .................... 2
..................
. B TROUBLE AND CHECK POINTS 3
1
. Skipping stitches ........................... 3
2
. Material not feeding ......................... 3
3 . Breaking needle ............................ 3
............................
. 4 Heavy running 4
5 . Machine noise ............................. 4
6
. Needlesewing over the maximum width ........... 4
7
. Uneaven seems of back and forth at manual ......... 4
8
. Improper position of needle drop slot at
the max
. stitch width ........................
5
9 . Needle swing in straight stitch sewing ............. 5
10
. Feeding at bar tack sewing of buttonhole ...........
5
11 . Not smooth working of pattern selectingdial ........ 5
12 . Imperfect automatic patterns ................... 5
13
. Uneven seams of reverse patterns ................ 6
14
. Breaking of upper thread ..................... 6
15
. Breakingof lower thread ...................... 6
16
. How toassemble the parts correctly .............. 7
C
. HOW TO ADJUST THE ELEMENTS
........................
1 - 1 . Height of presser bar 8
........................
1 - 2 . Height of presser bar 8
.........................
2 . Height of needle bar 8
..........
.
3 - 1 Clearance between needle and hook point 9
..........
.
3 - 2 Clearance between needle and hook point 9
......................
4-1 . Position of shuttle hook 10
......................
.
4 - 2 Position of shuttle hook 10
....
.
51 Clearance between shuttle driver shaft and race way 11
....
.
52 Clearance between shuttle driver shaft and race way 11
...................
.
6 - 1 Position of vertical feed cam 12
...................
6 - 2 . Position of vertical feed cam 12
7.1 . Heightoffeeddog .......................... 13
..........................
7 - 2 . Height of feed dog 13
...............................
.
8 Forth seam 14
........................
9 - 1 . Back and forth seam 14
........................
9.2 . Back and forth seam 14
.....
.
10.1 Back and forth seam at automatic reverse patterns
.....
.
10.2 Back and forth seam at automatic reverse patterns
................ .
11 Adjustment of button hole seams
12.1
. Needle swing in straight stitch sewing .............
12.2 . Needle swing in straight stitchsewing .............
12.3 . Needle swing in straight stitch sewing .............
. ....................... 13.1 Centering of the needle
. ....................... 13.2 Centering of the needle
........................
. 14 Position of feed cam
. ................ 15.1 Setting of maximum stitch width
................ .
15.2 Setting of maximum stitch width
. ................
15.3 Setting of maximum stitch width
. ............ 16.1 Position of the maximum needle swing
. ............ 16.2 Position of the maximum needleswing
. ............
16.3 Position of the maximum needle swing
17.1 . Contact of upper shaft gear, pattern cam and feed cam . .
17.2 . Contact of upper shaft gear, pattern cam and feed cam . .
17.3 . Contact of upper shaft gear, pattern cam and feed cam . .
.
....................
18.1 Sewing timingof the needle
18.2
. Sewingtiming of the needle ....................
18.3 . Sewing timing of the needle ....................
19.1A . Clearance between cam finger and pattern cam .......
19 - 1B . Clearance between cam finger and feed cam .........
20.1A . Position of cam finger for pattern cam .............
20 - 1B . Position of cam finger for feed cam ...............
21.1 . Setting of upper thread tension dial ..............
21.2 . Setting of upper thread tension dial ..............
22 . Adjustment of feed dog movement at buttonhole sewing
. ....................... 23.1 Setting of pattern dial
. ....................... 23.2 Setting of pattern dial
24.1 . How to take off stitch width, stitch length dial
and arm panel
............................
24.2 . How to take off stitch width, stitch length dial
.............................
andarm panel
24.3 . How totake off stitch width, stitch length dial
............................
and arm panel
25.1
. Adjusting of the drive belts ....................
25.2 . Adjusting of the drive belts ....................
25.3 . Adjusting of the drive belts ....................

A. HOW TO USE THIS MANUAL
This service manual is compiled for repairing service for VX-
NOTE:
SERIES SEWING MACHINE and consisting of;
1. Set the machine as below in " HOW TO ADJUST THE
ELEMENTS
" when there is no special instruction on each
elements.
B. TROUBLES AND CHECK POINTS
C. HOW TO ADJUST THE ELEMENTS STITCH WIDTH REGULATOR
. . . . . . . .O (straight stitch)
STlCH LENGTH REGULATOR. . . . . . . .O (nofeeding)
NEEDLE POSITION SELECTOR.
. . . . . .M (center)
In case of home
- use sewing machine, almost all troubles or pro -
blems brought from consumers will be solved by following the
instruction book, because the causes in many cases are due to
2. Adjust following numbers in circle in each instruction.
mis
- use or carelessness. Therefore, we recommend you to refer
to
" CHECK LIST FOR BETTER SEWING " in the instruction
book before you try to repair.
3. Symbols used are:
Suggest to use this manual with " PARTS CATALOGUE "
when you try to repair and pick up a point or points.
Model numbers covered by this manual are
VX511, VX541, VX561, VX581
(Freearm sewing machine)
VX611, VX641, VX661, VX681
VX710, VX720, VX740, VX760, VX780
VX516, VX546, VX566, VX586 (Flatbed sewing machine)
VX616, VX646, VX666, VX686
Move the part as this way
Set the clearanceas indicated
Move the parts to its highest or
lowest position
tl +
L
t
T 1

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 timingof 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 (ItemNo.)
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 clearancebetween the needle and
shuttle hook
(4) Improper max. needle swing
(5) lmproper swing timingof 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

TROUBLE AND CAUSE
CORRECTION
Refer to:
INSTRUCTION BOOK or:
13. UNEVEN SEAMS OF REVERSE PATTERNS
Refer to: SERVICE MANUAL (ItemNo.)
following models
(1 ) Improper setting of reverse feed devices
vX710
9 - 1
VX720
10 - 1
VX511. VX541. VX561. VX581. VX516. VX546. VX566. VX586. VX611. VX641
VX661. VX681. VX616. VX646. VX666. VX686. VX720. VX740. VX760. VX780
9-2
VX541. VX561. VX581. VX546, VX566. VX586. VX641, VX661
VX681, VX646. VX666. VX686. VX740. VX760. VX780
10 - 2
14. BREAKING OF UPPER THREAD
(1 ) Incorrect relation of needle & thread
(2) Bent or blunt needle
(3) Inferior needle eye
(4) Incorrect threading
(5) Inferior needle slot of needle plate
(6) Upper thread tension too tight
(7) Scratch on the shuttle hook
Relative chart
Change the needle
Change the needle
Upper threading
Change needle plate
Thread tension
Change the shuttle hook
15. BREAKING LOWER THREAD
(1 ) Not smooth running of bobbin
(2) Scratch on tension spring of bobbin case
(3) Scratch on the shuttle hook
(4) Lower thread tension too tight
Change the bobbin
Change the spring
Change the shuttle hook
Thread tension

CORRECTION
TROUBLE AND CAUSE Refer to: Refer to: SERVICE MANUAL (ItemNo.)
16. HOW TO ASSEMBLE THE PARTS CORRECTLY
(3) Decoration panel
(1) Upper thread tension dial
(2) Setting of pattern dial
~541.~561.
~-
(4) Drive belts
VX710. VX720. VX740
VX760. VX780
251
vx710
21 - 1
VX720
23-1
VX581. VX516. VX546. VX566. VX586. VX611, VX641
VX661. VX681. VX616. VX646. VX666. VX686. VX720. VX740, VX760, VX780
-
21 - 2
VX541. VX561. VX581. VX546. VX566. VX586. VX641, VX661
VX681. VX646. VX666. VX686. VX740. VX760. VX780
23 - 2

C. HOW TO ADJUST THE ELEMENTS
2. Height of needle bar
-
VX511, VX541, VX561, VX581, VX516, VX546
VX566, VX586, VX611, VX641, VX661, VX681
VX616, VX646, VX666, VX686, VX710, VX720
VX740, VX760, VX780
Before adjustment: Set the stitch
width regulator at
5 (Max.)and check
needle comes to the right side.
\q 0'
#$;- 1 \,;-. 1.0 mm
- 0"
0 mm
1 - 1. Height of presser bar
VX710
1 - 2. Height of presser bar
VX511, VX541, VX561, VX581, VX516
VX546, VX566, VX586, VX611, VX641
VX661, VX681, VX616, VX646, VX666
VX686, VX720, VX740, VX760, VX780

3 - 1. Clearance between needle and hook point
VX511, VX541, VX561, VX581
VX611, VX641, VX661, VX681
VX710, VX720, VX740, VX760, VX780
Before adjustment: Set the stitch width regulator at 0.
Note: When you adjusted this item, check item 4-1.
3 - 2. Clearance between needle and hook point
VX516, VX546, VX566, VX586
VX616, VX646, VX666, VX686
Note: When you adjusted this item, check item 4 - 2.

5-1. Clearance between shuttle driver shaft and race way 5-2. Clearance between shuttle driver shaft and race way
VX511, VX541, VX561, VX581 VX611,
VX641, VX661, VX681 VX710, VX720,
VX740, VX760, VX780
VX516, VX546, VX566, VX586
VX616, VX646, VX666, VX686
Shuttle driver
0.05± 0.2
0 mm 1.0 mm
0 mm
0.2 mm
0.05 ~ 0.2 mm
1 f
Racewa
y
Note: When you adjusted this item, check item 4-1. Note: When you adjusted this item, check item 4-2.
-11-

6-1. Position of vertical feed cam 6-2. Position of vertical feed cam
VX511, VX541, VX561, VX581 VX611,
VX641, VX661, VX681 VX710, VX720,
VX740, VX760, VX780
VX516, VX546, VX566, VX586
VX616, VX646, VX666, VX686
©
- 12 -

(Needle + highest)
7 - 1. Height of feed dog
VX511, VX541, VX561, VX581
VX611, VX641, VX661, VX681
VX710, VX720, VX740, VX760, VX780
Before adjustment. Set the st~tchlength regulator at
"4"
(Max ) & st~tchw~dthregulator at "0"
--==+ 0'
09 - 1 1 mm
7 - 2. Height of feed dog
VX516, VX546, VX566, VX586
VX616, VX646, VX666, VX686
' \

8. Forth seam
VX541, VX561, VX581, VX546, VX566, VX586
VX641, VX661, VX681, VX646, VX666, VX686
VX740, VX760, VX780
Before adjustment Set the stltch
length regulator at 4 (Max.) & st~tch
w~dthregulator at 0
9 - 1. Back and forth seam
VX710
Before adjustment. Set the st~tch
9 - 2. Back and forth seam
VX511, VX541, VX561, VX581, VX516
VX546, VX566, VX586, VX611, VX641
VX661, VX681, VX616, VX646, VX666
VX686, VX720, VX740, VX760, VX780
length regulator at " 2 " . . . ....
0

10-1. Back and forth seam at automatic reverse patterns
VX720
Before adjustment Set the pattern and st~tchlength
regulator
at SS (Stretch Stitch)
10-2. Back and forth seam at automatic reverse patterns
VX541, VX561, VX581, VX546, VX566, VX586
VX641, VX661, VX681, VX646, VX666, VX686
VX740, VX760, VX780
Before adjustment Set the pattern
selecting dlal at SS
(StretchSt~tch).
Note. When adjusted th~sItem, check Item 11

11. Adjustment of buttonhole seams
VX541, VX561, VX581, VX546, VX566, VX586
VX641, VX661, VX681, VX646, VX666, VX686
VX740, VX760, VX780
Before adjustment: Set the pattern selecting dial at 1. *lf the buttonhole seams are too fine or too coarse,
change the screw hole as follows by loosing the screw
(A) completely.

13-1. Centering of the needle 13-2. Centering of the needle 14. Position of feed cam
VX710 VX511, VX541, VX561, VX581, VX516, VX546
VX566, VX586, VX611, VX641, VX661, VX681
VX616, VX646, VX666, VX686, VX720, VX740
VX760, VX780
VX511, VX541, VX561, VX581, VX516, VX546
VX566, VX586, VX611, VX641, VX661, VX681
VX616, VX646, VX666, VX686, VX710, VX720
VX740, VX760, VX780
Before adjustment: Set the stitch width regulator at "0".
o o