Brother LK3-B438E Instruction manual

LK3-B438E
INSTRUCTION MANUAL
Please read this manual before using the machine.
Please keep this manual within easy reach for quick reference.
ELECTRONIC LOCKSTITCH BUTTON SEWER
Thank you very much for buying a BROTHER sewing machine. Before using your new machine, please read the safety instructions below and the explanations given in the instruction manual.
With industrial sewing machines, it is normal to carry out work while positioned directly in front of moving parts such as the
needle and thread take-up lever, and consequently there is always a danger of injury that can be caused by these parts. Follow
the instructions from training personnel and instructors regarding safe and correct operation before operating the machine so
that you will know how to use it correctly.
SAFETY INSTRUCTIONS
1. Safety indications and their meanings
This instruction manual and the indications and symbols that are used on the machine itself are provided in order to ensure safe
operation of this machine and to prevent accidents and injury to yourself or other people.
The meanings of these indications and symbols are given below.
Indications
DANGER
The instructions which follow this term indicate situations where failure to follow the instructions
will almost certainly result in death or severe injury.
CAUTION
The instructions which follow this term indicate situations where failure to follow the instructions could cause injury when using the machine or physical damage to equipment and surroundings.
Symbols
................ This symbol (
) indicates something that you should be careful of. The picture inside the triangle indicates the nature of the caution that must be taken.
(For example, the symbol at left means “beware of injury”.)
................ This symbol (
) indicates something that you must not do.
................ This symbol (
) indicates something that you must do. The picture inside the circle indicates the nature
of the thing that must be done.
(For example, the symbol at left means “you must make the ground connection”.)
LK3-B438E Mark II
i
2. Notes on safety
DANGER
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet before
opening the face plate of the control box. Touching areas where high voltages are present can result in severe injury.
CAUTION
Environmental requirements
Use the sewing machine in an area which is free from
sources of strong electrical noise such as highfrequency welders.
Sources of strong electrical noise may cause problems with correct operation.
Any fluctuations in the power supply voltage should
be within ±10% of the rated voltage for the machine.
Voltage fluctuations which are greater than this may
cause problems with correct operation.
The power supply capacity should be greater than the
requirements for the sewing machine's electrical
consumption.
Insufficient power supply capacity may cause problems with correct operation.
The ambient temperature should be within the range
of 5°C to 35°C during use.
Temperatures which are lower or higher than this may
cause problems with correct operation.
The relative humidity should be within the range of 45%
to 85% during use, and no dew formation should occur
in any devices.
Excessively dry or humid environments and dew formation may cause problems with correct operation.
Avoid exposure to direct sunlight during use.
Exposure to direct sunlight may cause problems with
correct operation.
In the event of an electrical storm, turn off the power
and disconnect the power cord from the wall outlet.
Lightning may cause problems with correct operation.
Installation
Machine installation should only be carried out by a
qualified technician.
Contact your Brother dealer or a qualified electrician
for any electrical work that may need to be done.
The sewing machine weighs more than 47 kg. The
installation should be carried out by two or more people.
Install the belt covers to the machine head and motor.
Do not connect the power cord until installation is
complete, otherwise the machine may operate if the
foot switch is pressed by mistake, which could result
in injury.
If using a work table which has casters, the casters
should be secured in such a way so that they cannot
move.
Hold the machine head with both hands when tilting it
back or returning it to its original position.
Furthmore, after tilring back the machine head, do not
push the face plate side or the pulley side from above,
as this could cause the machine head to topple over,
which may result in personal injury or damage to the
machine.
Be sure to connect the ground. If the ground connection is not secure, you run a high risk of receiving a
serious electric shock, and problems with correct
operation may also occur.
ii
All cords should be secured at least 25 mm away from
any moving parts. Furthermore, do not excessively
bend the cords or secure them too firmly with staples,
otherwise there is the danger that fire or electric shocks
could occur.
LK3-B438E Mark II
Be sure to wear protective goggles and gloves when
handling the lubricating oil and grease, so that they do
not get into your eyes or onto your skin, otherwise inflammation can result.
Furthermore, do not drink the oil or eat the grease under any circumstances, as they can cause vomiting
and diarrhoea.
Keep the oil out of the reach of children.
CAUTION
Sewing
This sewing machine should only be used by operators who have received the necessary training in safe
use beforehand.
If using a work table which has casters, the casters
should be secured in such a way so that they cannot
move.
The sewing machine should not be used for any
applications other than sewing.
Attach all safety devices before using the sewing
machine. If the machine is used without these devices
attached, injury may result.
Be sure to wear protective goggles when using the
machine.
If goggles are not worn, there is the danger that if a
needle breaks, parts of the broken needle may enter
your eyes and injury may result.
Set the needle to the needle up stop position before
turning on the power.
If this is not done, the wiper may strike the needle,
which might cause the needle to break.
Turn off the power switch at the following times,
otherwise the machine may operate if the foot switch
is pressed by mistake, which could result in injury.
• When threading the needle
• When replacing the needle and bobbin
• When not using the machine and when leaving the
machine unattended
Do not touch any of the moving parts or press any
objects against the machine while sewing, as this may
result in personal injury or damage to the machine.
If an error occurs in machine, or if abnormal noises or
smells are noticed, immediately turn off the power
switch. Then contact your nearest Brother dealer or a
qualified technician.
If the machine develops a problem, contact your
nearest Brother dealer or a qualified technician.
Cleaning
Set the needle to the needle up stop position before
turning on the power.
If this is not done, the wiper may strike the needle,
which might cause the needle to break.
Turn off the power switch before carrying out cleaning,
otherwise the machine may operate if the foot switch
is pressed by mistake, which could result in injury.
Be sure to wear protective goggles and gloves when
handling the lubricating oil and grease, so that they do
not get into your eyes or onto your skin, otherwise inflammation can result.
Furthermore, do not drink the oil or eat the grease under any circumstances, as they can cause vomiting
and diarrhoea.
Keep the oil out of the reach of children.
Maintenance and inspection
Maintenance and inspection of the sewing machine
should only be carried out by a qualified technician.
Ask your Brother dealer or a qualified electrician to
carry out any maintenance and inspection of the
electrical system.
Set the needle to the needle up stop position before
turning on the power.
If this is not done, the wiper may strike the needle,
which might cause the needle to break.
Turn off the power switch and disconnect the power
cord from the wall outlet at the following times,
otherwise the machine may operate if the foot switch
is pressed by mistake, which could result in injury.
• When carrying out inspection, adjustment and
maintenance
• When replacing consumable parts such as the rotary hook
Hold the machine head with both hands when tilting it
back or returning it to its original position.
Furthermore, after tilting back the machine head, do
not push the face plate side or the pulley side from
above, as this could cause the machine head to topple
over, which may result in personal injury or damage to
the machine.
Use only the proper replacement parts as specified by
Brother.
If any safety devices have been removed, be absolutely sure to re-install them to their original positions
and check that they operate correctly before using the
machine.
Any problems in machine operation which result from
unauthorized modifications to the machine will not be
covered by the warranty.
If the power switch needs to be left on when carrying
out some adjustment, be extremely careful to observe
all safety precautions.
LK3-B438E Mark II
iii
3. Warning labels
The following warning labels appear on the sewing machine.
Please follow the instructions on the labels at all times when using the machine. If the labels have been removed or are
difficult to read, please contact your nearest Brother dealer.
1
Hazardous voltage
will cause injury.
Hochspannung
verletzungsgefahr!
Turn off main
switch and wait 5
minutes before
opening this cover.
Bitte schalten sie den Eteindrel'interrupteur et
hauptschalter aus und attendre 5 minutes
warten sie 5 minuten, avantd' ouvrir le capot
bevor sie diese
abdeckung öffnen.
2
Moving parts
may cause injury.
Operate with safety devices.
Turn off main switch before
threading, changing bobbin
and needle, cleaning etc.
Un voltage non adapté
provoque des blessures.
Un voltaje inadecuado
puede provocar las
heridas.
Apagar el interruptor
principal y esperar 5
minutos antes de abrir
esta cubierta.
Safety devices
Eye guard
Finger guard
Thread take-up cover
Thread take-up solenoid cover
Belt cover
Motor cover, etc.
3
Be sure to connect the ground. If the ground connection is not secure, you run a high risk of receiving a
serious electric shock, and problems with correct operation may also occur.
4
Direction of operation
4
Eye guard
Thread
take-up
cover
2
Belt
cover
Thread
take-up
solenoid
cover
3
Finger guard
Motor cover
iv
LK3-B438E Mark II
1
CONTENTS
1. NAME OF EACH PART ............................... 01
2. SPECIFICATIONS ......................................... 02
2-1.
2-2.
Specifications .......................................
Program list ..........................................
2
3
3. INSTALLATION ............................................. 06
3-1.
3-2.
3-3.
3-4.
3-5.
3-6.
3-7.
3-8.
3-9.
3-10.
3-11.
3-12.
3-13.
3-14.
3-15.
3-16.
3-17.
3-18.
3-19.
3-20.
Power table ...........................................
Installing the motor .............................
Installing the motor pulley ..................
Installing the control box ....................
Installing the rubber cushions ............
Installing the oil pan ............................
Installing the cushions .........................
Installing the machine head ...............
Installing the head rest ........................
Installing the liquid cooling tank,
optional .................................................
Installing the operation panel .............
Connecting the ground wire ...............
Connecting the cords ...........................
Installing the V-belt ..............................
Installing the belt cover .......................
Installing the foot switch .....................
Installing the motor cover ...................
Installing the spool stand ....................
Installing the button tray .....................
Installing the eye guard ......................
6
7
7
8
9
9
9
10
10
10
11
11
12
13
14
14
15
15
15
15
4. LUBRICATION ............................................... 16
9-2.
9-3.
9-4.
9-5.
9-6.
Lubrication ............................................
Draining the oil .....................................
Cleaning the control box air inlet
port ........................................................
Cleaning the eye guard .......................
Checking the needle ............................
28
29
29
29
29
10.STANDARD ADJUSTMENTS ................. 30
10-1. Adjusting the needle bar height .........
10-2. Adjusting the needle bar lift
amount ..................................................
10-3. Adjusting the driver needle guard .....
10-4. Adjusting the needle clearance ..........
10-5. Adjusting the shuttle race thread
guide ......................................................
10-6. Adjusting the thread take-up
amount ..................................................
10-7. Adjusting the movable knife ...............
10-8. Adjusting the button clamp lift
amount ..................................................
10-9. Adjusting the holding pressure ..........
10-10.Adjusting the position of the
button holder ........................................
10-11.Adjusting the needle up stop
position .................................................
10-12.Adjusting the thread wipper ...............
10-13.Checking the input sensor and
DIP switch input ...................................
10-14.Checking the input voltage .................
10-15.Clearing all memory settings .............
10-16.Moving stitch patterns .........................
30
30
31
31
31
32
32
34
35
35
36
36
37
38
38
39
Lubrication points ................................ 16
11.USING THE COUNTERS ......................... 40
5. OPERATION .................................................. 17
11-1. Using the bobbin thread counter ....... 40
11-2. Using the production counter ............ 40
4-1.
5-1.
5-2.
Name and function of each
operation panel item ........................... 17
Operating procedure ............................ 19
6. CHECKING THE SEWING PATTERN ....... 20
7. CORRECT USE ......................................... 21
7-1.
7-2.
7-3.
7-4.
7-5.
7-6.
7-7.
7-8.
7-9.
Selecting the needle and thread ........
Installing the needle ............................
Threading the upper thread ................
Winding the lower thread ...................
Replacing the bobbin case and
threading the thread ............................
Thread tension reference guide .........
Inserting the button .............................
Adjusitng the button holder ...............
Adjustment by the accessory
spring ....................................................
21
21
21
22
12.CHANGING FUNCTIONS USING
THE DIP SWITCHES ................................ 41
12-1. Operation panel DIP switches ............
12-2. Setting the presser mode ...................
12-3. DIP switches inside the control
box .........................................................
12-4. Using user programs ...........................
41
41
42
43
13.CHANGING SPECIAL FUNCTIONS
USING THE MEMORY SWITCHES ........ 45
13-1. Using the cycle sewing function ........ 47
23
23
25
25
14.TABLE OF ERROR CODES ...................... 49
15.GAUGE PARTS LIST ............................... 51
25
16.TROUBLESHOOTING ................................. 52
8. SEWING ................................................... 26
17.OPTIONAL PARTS ....................................... 55
9. MAINTENANCE AND INSPECTION ....... 27
9-1.
Cleaning the rotary hook .................... 27
LK3-B438E Mark II
1 . NAME OF EACH PART
1. NAME OF EACH PART
i
!2
o
u
y
!1
!5
!3
e
!0
q
!4
t
w
r
qPower switch
wControl box
eOperation panel
rFoot switch
t Motor
yTension release lever
uPulley
iSpool stand
oThread take-up lever
1
Safety devices;
!0 Finger guard
!1Eye guard
!2 Thread take-up cover
!3 Belt cover
!4 M otor cover
!5 Thread take-up solenoid cover
LK3-B438E Mark II
2 . SPECIFICATIONS
2 . SPECIFICATIONS
2-1 . Specifications
Stitch formation
Single needle lock stitch
Maximum sewing
speed
2,500rpm
Maximum pattern
size
0 - 6.4 × 0 - 6.4 mm
TQ × 1#12
Needle
Dimensions of
buttons that can be
sewn
Outer diameter of button 8 - 30 mm
(Use the optional button clamp B for diameters of 20 mm or greater.)
Space between the button holes 0 - 6.4 mm
Button clamp height
13 mm max.
Thread knot
Feed mechanism
Stitch length
Number of stitches
Knot tied by needle
R-θ intermittent feed mechanism (pulse-motor driven mechanism)
0.1 - 10.0 mm
Variable (13, 15, 17, 19, 20, 22, 23, 24, 26, 27, 28, 30, 32, 34, 38 stitches
pre-set)
Maximum stitch
number
20,000 stitches (including 10,000 stitches which can be added)
Work clamp lifter
Solenoid type
Rotary hook
Shuttle hook
Wiper device
Standard equipment
Thread trimmer
device
Standard equipment
Thread take-up device
Standard equipment
Data storage method
P-ROM (Any sewing pattern can be added using BAS-PC/300.)
Number of user
programs
16
Number of cycle
programs
4
Number of stored
data
Motor
Weights
Power source
49 sewing patterns are set already.
(Up to 100 patterns can be added. Total number of stitches of stored data
which can be added is within 10,000.)
Three-phase 400W induction motor
Machine head: 47kg, Operation panel: 0.6kg,
Control box: 9 - 19kg (depending on destination)
Single-phase 220 - 230V
3-phase 220, 380, 400, 415V
Maximum electric power consumption; 600VA
LK3-B438E Mark II
2
2 . SPECIFICATIONS
2-2 . Program list
Sewing patterns are limited as shown in the table below.
(Any program is available as long as the needle drops down in the hole of the button.)
Program No.
Sewing
pattern
No. of
threads
No. of
crossover
stitches
No. of
Standard
Standard
stitches sewing length X sewing width Y
1
6
__
13
2
8
__
15
3
10
__
17
4
12
__
19
16
__
23
20
__
27
6
__
13
10
__
17
12
__
19
5-5-5
__
22
7-7-7
__
28
5-5-5
__
22
7-7-7
__
28
10
6-6
1
20
11
8-8
1
24
8-8
3
26
13
10-10
1
28
27
12-12
1
32
6-6
0
26
8-8
0
30
10-10
0
34
12-12
0
38
5
6
7
23
8
9
24
25
26
*1
14
28
15
29
2
*1
*2
*2
*2
*2
*2
*2
3
*2
4
12
3
No. of
button holes
*3
*3
*3
*3
4
LK3-B438E Mark II
3.4mm
0mm
0mm
3.4mm
2.6mm
2.4mm
3.4mm
3.4mm
2 . SPECIFICATIONS
No. of
threads
No. of
crossover
stitches
16
6-5
1
19
17
8-7
1
23
30
10-9
1
27
18
6-6
1
20
19
8-8
1
24
Program No.
No. of
button holes
Sewing
pattern
No. of
Standard
Standard
stitches sewing length X sewing width Y
31
10-10
1
28
45
12-12
1
32
6-6
0
26
8-8
0
30
10-10
0
34
6-6
1
20
10-10
1
28
6-6
0
26
35
10-10
0
34
46
6-6
1
20
47
8-8
1
24
20
32
33
21
34
*3
*3
*3
*2
*2
*2*3
22
*2*3
3.4mm
3.4mm
2.4mm
3.4mm
3.4mm
3.4mm
4
48
10-10
1
28
49
12-12
1
32
* 1 Check that the button hole diameter is 2 mm or greater before using the programs.
* 2 Do not use the button lifter spring.
* 3 Thread is trimmed after sewing of one side is completed, because there is no crossover thread to be sewn.
To continue sewing to the end, keep the foot switch depressed until sewing of the other side starts, or
press the foot switch once more after sewing of the first side is completed.
LK3-B438E Mark II
4
2 . SPECIFICATIONS
■ The following programs require the solenoid thread wiper (OP).
No. of
threads
No. of
crossover
stitches
36
6-6
0
26
37
8-8
0
30
38
10-10
0
34
39
12-12
0
38
6-6
0
26
41
8-8
0
30
42
10-10
0
34
6-6
0
26
No. of
Program No. button holes
4
40
43
44
Sewing
pattern
*
*
10-10
0
* 2 Do not use the button lifter spring.
5
LK3-B438E Mark II
No. of
Standard
Standard
stitches sewing length X sewing width Y
34
3.4mm
3.4mm
2.4mm
3.4mm
3. INSTALLATION
3. INSTALLATION
CAUTION
Machine installation should only be carried
out by a qualified technician.
All cords should be secured at least 25 mm
away from any moving parts. Furthermore,
do not excessively bend the cable or secure it too firmly staples, otherwise there is
the danger that fire or electric shocks could
occur.
Contact your Brother dealer or a qualified
electrician for any electrical work that may
need to be done.
The sewing machine head weighs more than
47 kg. The installation should be carried out
by two or more people.
Be sure to connect the ground. If the ground
connection is not secure, you run the risk
of receiving a serious electric shock, and
problems with correct operation may also
occur.
Do not connect the power cord until installation is complete, otherwise the machine may
operate if the foot switch is depressed by mistake, which could result in injury.
Install the belt covers to the machine head
and motor.
Hold the machine head with both hands when
tilting it back or returning it to its original position. Furthermore, after tilting back the machine head, do not push the face plate side
or the pulley side from above, as this could
cause the machine head to topple over, which
may result in personal injury or damage to
the machine.
3-1 . Power table
• Use the power table which has been specially designed
for each sewing machines.
* If using a commercially-available table, process it as
shown in the illustration below.
Table/ legs assembly
Model code
127-V30-00001
NOTE:
The thickness of the table should be at least 40 mm, and it should be strong enough to bear the weight and vibration of
the sewing machine.
If the distance A between the insides of the legs is less than 740 mm, move the control box installation position closer
to the motor (B = 247 mm).
Check that the control box is at least 10 mm away from the leg. If the control box and leg are touching, it could cause the
sewing machine to operate incorrectly.
Control Box
Operation
panel cord
hole
Motor
Counterbore depth 23
Section A-A
depth 5
LK3-B438E Mark II
6
3. INSTALLATION
3-2 . Installing the motor
Install the motor u to the work table with the four accessory bolts q, cushions w, cushion collars e, flat
washers r, spring washers t and nuts y.
At that time, fix by setting bolts q a little to the right
of oval hole on motor.
q
NOTE:
Tighten the nuts y so that the clearance between the table
and the cushion collars e is approximately 1 mm.
w
e
q
r
t
y
u
Table
1mm
e
3-3 . Installing the motor pulley
Place the motor pulley q onto the shaft of the motor
w so that the key groove is aligned, and then tighten
the set screw e so that the center of the V groove in
the motor pulley q is aligned as closely as possible
with the center of the belt hole in the power table.
q
w
e
7
LK3-B438E Mark II
3. INSTALLATION
3-4 . Installing the control box
!0
r
Table
t Cushions
yCushion collars
t
y
3mm
u
i
o
!1
u
Rubber collers
i
Flat washers
o
Nuts
!2
w
q
e
!3
1. Remove the 12 screws q, and then open the covers (panel mounting assembly w and main P.C. board
mounting plate e).
NOTE:
When opening the cover, hold it securely so that it does not fall down.
2. Install the control box with the four accessory bolts r, cushions t, cushion collars y, rubber collars u,
flat washers i and nuts o as shown in the illustration above. At this time, leave a gap of approximately
3 mm between the work table and the top of the box.
* Use two nuts o at each installation location, and make sure that both nuts are tightened.
3. Close the covers (panel mounting assembly w and main P.C. board mounting plate e), and tighten them
with the screws q.
* The main P.C. board mounting plate e will be opened again during “3-13. Connecting the cords”, so
provisionally tighten it with the screw q.
4. Install the power switch !0 with the two screws !1 .
5. Secure the power switch cord with the three staples !2 .
6. Pass the motor cord through the cord hole !3 .
LK3-B438E Mark II
8
3. INSTALLATION
3-5. Installing the rubber cushions
Install the rubber cushions q with the nails w.
w
q
3-6 . Installing the oil pan
q
w
1. Insert the tabs of the oil pan w into the holes for
the cushions q, and then secure it in place with
the five nails e so that the oil pan w is not at an
angle.
2. While pushing the oil pan w down from above,
screw in the oil container r.
e
r
3-7 . Installing the cushions
Place the two cushions q into the holes in the work
table so that the notches are aligned with the tabs in
the oil pan, and secure them in place with the nails w.
w
q
9
LK3-B438E Mark II
3. INSTALLATION
3-8 . Installing the machine head
y
u
66
17
13
w
q
e
r
t
1. Insert the head hinges q into the machine head so that they are parallel, and then secure them with the
two set screws w.
2. Place the machine head gently on top of the rubber cushions e and cushions r.
NOTE:
Pull the cords t out as shown in the illustration above in order to prevent them from being clamped by the machine
head.
3. Install the hinge presser y with the two screws u.
3-9 . Installing the head rest
Tap the head rest q into the table hole.
q
NOTE:
Tap the head rest securely into the table hole.
3-10 .Installing the liquid cooling tank, optional
w
q
1. Remove the rubber plug, and then push the liquid
cooling tank q.
2. Tighten it with the set screw w.
LK3-B438E Mark II
10
3. INSTALLATION
3-11 . Installing the operation panel
The operation panel can be installed to either the top or bottom of the work table.
Top of work table
Bottom of work table
q
r
r
q
e
w
e
t
Table
w
Table
t
1. Install the rear frame q to the work table (top or bottom) with the four wood screws w.
2. Install the front frame e to the rear frame q with the four screws r.
* The vertical orientation of the front frame e is the same whether it is installed to the top or the bottom of
the work table.
3. Insert the connector cord t into the control box through the hole at the side of the box. Refer to “3-13.
Connecting the cords” for details on connecting the cord.
4. Secure the connector cord t with the staples (in three places).
3-12 . Connecting the ground wire
CAUTION
Be sure to connect the ground. If the ground connection is not secure, you run the risk of receiving a serious electric shock, and problems with correct operation may also occur.
Red
White
Black
Yellow/Green
11
Connect to the power switch. However, the
black wire is insulated to the inside of the box
and is not used.
Connect to ground
LK3-B438E Mark II
3. INSTALLATION
3-13 . Connecting the cords
q
!2
!3
t
o
P8
P1
w
P2
P3
q
!1
r
!0
P4
P5
P6
P7
P11
Machine head connectors
Connection location
u
y
i
e
Connection location on circuit board
No. of pins
Cord mark
X, Y, Sewing sensor
12-pin
z
P1 (ORG2)
Synchronizer
5-pin
x
P2 (SYNCHRO)
Machine specification
select connector
8-pin
c
P3 (SELECT)
Thread take-up solenoid
5-pin
v
P4 (SOL2)
Presser solenoid
Thread trimmer solenoid
4-pin
b
P5 (SOL)
Pulse motor, Y
4-pin (blue)
n
P6 (YPM)
Pulse motor, X
4-pin
m
P7 (XPM)
Operation panel
26-pin
None
P8 (PANEL)
Upper shaft motor
3-pin
None
P11 (UVW)
1. Gently tilt back the machine head.
NOTE:
After tilting back the machine head, do not push the face side or the pulley side from above.
2. Pass the cords q through the hole w in the work table.
3. Gently return the machine head to its original position.
4. Remove the six screws e, and then open the control box cover (main P.C. board mounting plate r).
NOTE:
When opening the cover, hold it securely so that it does not fall down.
5. Loosen the two screws t,and then open the cord presser plate y in the direction of the white arrow and
pass the cords q through the opening.
6. Loosen the screw o, and then attach the ground cord u for the machine head and the ground cord i for
the operation panel as shown in the illustration.
7. Loosen the screw !1, and then attach the ground cord !0 for the upper shaft motor as shown in the illustration.
8. Securely connect connectors P1 to P8 and P11 as indicated in the table.
9. Secure the cords q with the cord clamps !2 and !3.
10. Close the cord presser plate y in the direction of the black arrow, and secure it by tightening the screws t.
NOTE:
Check that the cords do not get pulled when the machine head is tilted back gently.
11. Tighten the cover (main P.C. board mounting plate r) with the six screws e.
LK3-B438E Mark II
12
3. INSTALLATION
3-14 . Installing the V-belt
1. Gently tilt back the machine head, and then place
the V-belt q into the V grooves on the machine
head pulley w and the motor pulley e.
w
NOTE:
After tilting back the machine head, do not push the
face plate side or the pulley side from above.
2. Gently return the machine head to its original position.
* Be careful not to clamp the cords at this time.
3. Provisionally install the accessory tension pulley
assembly r with the accessory flat washer, spring
washer and bolt.
4. Adjust the belt tension by moving the tension pulley assembly to the right and left so that there is 9-10 mm of deflection in the V-belt q when it is
gently pushed in the middle with a force of approximately 10 N. After adjusting, tighten the bolt
A to secure the left pulley assembly.
5. Move the right tension pulley so that there is a
gap of about 1 mm between it and the V-belt q,
and then tighten the bolt B to secure the right
pulley assembly.
q
e
A
Approx.
1mm
B
r
Approx. 9-10mm
10N
NOTE:
Use brother specified V-belt (belt, VM).
The V-belt q may stretch slightly when it is first used,
so adjust the belt tension after about 3,000 cycles of
use.
When above belt tension is week, this will be cause of
following problems;
• Noise & vibration become large.
• Needle up stop position becomes unstable.
• Error message [E-50] is displayed.
Check that the motor is positioned so that the Vbelt is straight. (Fig.1)
Sewing
machine
V-belt
Motor
Fig.1
13
LK3-B438E Mark II
3. INSTALLATION
3-15 . Installing the belt cover
w
q
e
t
u
r
y
1. Loosen the two screws w of the upper cover q and the two screws r of bed cover Le.
2. Insert the belt cover t in the direction of the arrow, and then secure it with the two screws w, the two
screws r and the screw y.
* When tilting back the machine head, loosen the screws w and r, remove the screw y and then remove
the belt cover t first.
3. Attach the rubber plug u to the belt cover.
3-16. Installing the foot switch
[A]
y
u
i
q
w
!2
e
t
r
!1
!0
o
e
!3
!4
!6
!5
[B]
!7
!8
!9
1. Insert the connector of the foot switch e into the connector w of the control box q.
2. Install the foot switch e to the work table leg !2 with foot switch support plate A r, foot switch support
plate C t, the bolt y, spring washer u, flat washer i, bolt o, spring washer !0 and flat washer !1 as
shown in Figure A.
♦If foot switch support plate B !3 is used in a back-to-front position, it can be used as shown in Figure. B.
1. Remove the screw !4 and rubber plug !5.
* Note that the spring !6 will come out when the screw !4 is removed.
2. Turn foot switch support plate B !3 back to front, and then install it with the bolt !7 , spring washer !8 and
flat washer !9 as shown in Figure. B.
NOTE:
If using the foot switch without installing it to the work table leg, move the foot switch at least 10 mm away from the
leg. If the foot switch is not fully in contact with the work table leg when the foot switch is used, for example, if it is
just hooked loosely onto the work table leg, it may cause the sewing machine to operate incorrectly.
If using the optional two-pedal foot switch, change the setting of DIP switch A on the oreration panel while referring
to "Setting the presser mode" on page 41.
LK3-B438E Mark II
14
3. INSTALLATION
3-17 . Installing the motor cover
1. Install the motor cover q to the motor back cover
w with the screws e and the flat washers r.
2. Pass the motor shaft through the notch in the motor back cover w, and then tighten the screws y
and the washers u so that the clearance between
the motor pulley t and the motor cover q is
uniform.
q
w
r
e
u
y
t
3-18 . Installing the spool stand
3-19 . Installing the button tray
q
e
w
r
q
Assemble the spool stand q while referring to the
spool stand instruction manual, and then install the
spool stand q at the right side of the work table.
1. Install the button tray holder q with the two flat
wood screws w at a place convenient for operation.
2. Insert the button tray e into the button tray holder
q , and secure them wiith the screw r .
3-20 . Installing the eye guard
CAUTION
q
Attach all safety devices before using the
sewing machine.
If the machine is used without these devices attached, injury may result.
Install the eye guard assy w to the face plate q with
the two screws e.
e
15
w
LK3-B438E Mark II
4 . LUBRICATION
4. LUBRICATION
CAUTION
Turn off the power switch before starting lubricating, otherwise the machine may operate if the
foot switch is depressed by mistake, which could result in injury.
Be sure to wear protective goggles and gloves when handling the lubricating oil and grease, so
that they do not get into your eyes or onto your skin, otherwise inflammation can result.
Furthermore, do not drink the oil or eat the grease under any circumstances, as they can cause
vomiting and diarrhoea.
Keep the oil out of the reach of children.
NOTE 1: Fill the machine with oil when the oil level is down to about one-third full in the oil sight glass.
If oil is not added and the oil drops below this level, there is the danger that the machine may seize during
operation.
NOTE 2: Be sure to let the machine operate for a while after adding the oil.
NOTE 3: If there is no more oil on the felt of the shuttle race base, problems with sewing may result, so add oil to the felt
until it is slightly soaked.
NOTE 4: Use only specified Brother oil (Nisseki Sewing Libe 10) for the machine oil.
4-1 . Lubrication points
1. Fill the arm-side oil tank with oil.
* When setting up the sewing machine and when
it hasn’t been used for an extended period of
time, be sure to add 2-3 drops of oil at the place
indicated by the arrow.
2. Fill the bed-side oil tamk with oil
w
q
3. Add oil to the felt q of the shuttle race base.
* When setting up the sewing machine and when it
hasn’t been used for an extended period of time,
be sure to add 2-3 drops oil to the felt.
4. If using the liquid cooling tank w, fill it with silicon
oil (100 mm2/s).
LK3-B438E Mark II
16
5 . OPERATION
5 . OPERATION
5-1 . Name and function of each operation panel item
B430E
u
q
P
POWER
w
RESET
i
o
Y-SCALE
P1
P2
P3
P4
SPEED
r
TEST
PROGRAM NO.
X-SCALE
!0
e
Series
!4
!1
COUNTER
t
BOBBIN.WIND
SELECT
y
q POWER indicator .................. Illuminates when the power switch has been turned on.
w RESET switch ...................... . Press this switch to reset the machine when an error occurs.
e TEST switch ......................... Use this switch when you want to operate only the feed mechanism in order
to check a pattern.
r TEST indicator ...................... Illuminates when the TEST switch has been pressed.
t BOBBIN. WIND switch ......... Press this switch to wind the lower thread.
y SELECT switch ..................... Use this switch to select a menu (program number, X and Y feed, speed and
counter). Each time the switch is pressed, one of the menu indicators (u to
!1 ) illuminates, and the setting for that menu item appears in the display !4 .
The illiminated indicator changes as follows each time the switch is pressed.
PROGRAM NO. indicator u →X-SCALE indicator i →Y-SCALE indicator o →SPEED indicator !0 →COUNTER indicator !1
u PROGRAM NO. indicator ..... Illuminates when the SELECT switch y is pressed to shown the program
number setting.
17
LK3-B438E Mark II
5 . OPERATION
B430E
P
POWER
RESET
i
BOBBIN.WIND
PROGRAM NO.
P1
P2
!3
X-SCALE
o
Y-SCALE
!0
TEST
Series
P3
P4
SPEED
!4
!1
COUNTER
SELECT
!2
y
i X-SCALE indicator ................ Illuminates when the SELECT switch y is pressed to shown the X-scale setting.
o Y-SCALE indicator ................ Illuminates when the SELECT switch y is pressed to shown the Y-scale setting.
!0 SPEED indicator ................... Illuminates when the SELECT switch y is pressed to shown the speed setting.
!1 COUNTER indicator ............. Illuminates when the SELECT switch y is pressed to show the bobbin thread
or production counter setting.
!2 DISPLAY SET switches ........ Used to change the menu details which are displayed in the window !4 .
!3 User program switches ....... Used to set and select user programs.
!4 Display window .................... This display window will indicate the current statu for the selected menu,
error or memory switch.
LK3-B438E Mark II
18
5 . OPERATION
5-2 . Operating procedure
Preparation
Turn on the power switch.
(The POWER indicator q will illuminate and the pro
gram number will flash in the display window !4 .)
Factory default Variable range
Program No.
00 *
01 - 49
X-scale (%)
100
20 - 200
Y-scale (%)
100
20 - 200
Speed (rpm)
2000
1,000 - 2,500
* For checking the origin points for X and Y feed
5-2-1 . Setting the program number
Determine the appropriate program from the program list which is given on pp. 3 - 5.
1
Press the SELECT switch y
until the PROGRAM NO. indicator illuminates.
P
2
Press the DISPLAY SET
switches !2 until the desired
program number is flashing
in the display window.
3
Depress the foot switch to
the second step.
* The display will stop flashing
and illuminates steadily, and
the feed mechanism will move
to the sewing start position.
PROGRAM NO.
X-SCALE
y
1st step
2nd step
Y-SCALE
SPEED
COUNTER
SELECT
!2
This completes the setting of the program number.
5-2-2 . Setting the X-scale and Y-scale
1
Press the SELECT switch y
until the X-scale or Y-scale
indicator illuminates.
P
2
(The setting is displayed as a percentage.)
PROGRAM NO.
X-SCALE
Press the DISPLAY SET
switches !2 until the desired scale setting is flashing in the display window.
3
Depress the foot switch to
the second step.
* The display will stop flashing
and illuminates steadily, and
the feed mechanism will move
to the sewing start position.
1st step
2nd step
y
Y-SCALE
!2
SPEED
COUNTER
This completes the setting of the X-scale
or Y-scale.
SELECT
5-2-3 . Setting the sewing speed
1
Press the SELECT switch y
until the SPEED indicator illuminates.
P
2
Press the DISPLAY SET
switches !2 until the desired speed setting is flashing in the display window.
PROGRAM NO.
X-SCALE
y
Y-SCALE
SPEED
COUNTER
19
SELECT
!2
LK3-B438E Mark II
NOTE:
Be sure to check the sewing pattern
(refer to page 20) after setting has
been completed to make sure that
the needle drops down into the hole
of the button.
6. CHECKING THE SEWING PATTERN
6. CHECKING THE SEWING PATTERN
■ When checking by operating only the feed mechanism
1. Turn on the power switch.
(The POWER indicator will illuminate and the program number will flash in the display window.)
2. Set the X-scale and Y-scale in accordance with the hole pitch of the buttons being used.
(Refer to “5-2-2. Setting the X-scale and Y-scale”.)
3. Set the button.
(Refer to “7-7. Inserting the button”.)
4. Press the TEST switch.
(The TEST indicator will illuminate.)
TEST
5. Depress the foot switch to the second step.
Only the feed mechanism will move.
1st step
2nd step
(
)
The feed mechanism moves forward by one stitch each time the foot switch is depressed.
Each time the feed mechanism is moved forward by one stitch, turn the machine pulley
by hand and check that the needle goes into the holes in the button without touching the
button. Do this for each hole position. (NOTE)
After checking is complete, depress the foot switch to move the feed mechanism to the
end position.
* If you depress the foot switch again and keep it depresses after the feed mechanism has started to
move, the feeding speed will increase.
* If you would like to stop the feed while it is moving, press the TEST switch.
6. Press the TEST switch.
(The TEST indicator will switch off and the test mode will be cleared.)
TEST
7. Depress the foot switch.
The work clamp will rise and the preparation for sewing will be completed.
NOTE: If the needle touches the button, carry out the following.
1. Check that the needle size correctly matches the diameter of the holes in the button. (Refer to “7-1. Selecting the
needle and thread”.)
2. Make fine adjustments to the X-scale and Y-scale. (Refer to “5-2-2. Setting the X-scale and Y-scale”.)
3. Adjust the position of the button holder. (Refer to “10-10. Adjusting the position of the button holder”.)
To ensure safety during use ......
You can prevent accidental changes being made to
programs by setting DIP switches 7 and 8 to ON.
When DIP switch 7 is ON
... The sewing pattern cannot be enlarged.
When DIP switch 8 is ON
... The program number cannot be changed.
LK3-B438E Mark II
20
7. CORRECT USE
7. CORRECT USE
7-1 . Selecting the needle and thread
Needle
Refer to the table at right for details on which needle
and thread to select.
NOTE: Use buttons which have a hole diameter that is
greater than the value given in the table, to ensure
that the needle does not touch the button.
Thread
TQ × 1 #11
TQ × 1 #12
TQ × 1 #14
#60
#50
Button hole diameter
1.5mm or greater
1.6mm or greater
1.7mm or greater
7-2 . Installing the needle
CAUTION
Turn off the power switch before installing
the needle, otherwise the machine may
operate of the foot switch is depressed by
mistake and serious injury could result.
Loosen the set screw q, insert the needle w as far as
it will go so that the groove is facing toward you, and
then tighten the set screw q.
q
w
7-3 . Threading the upper thread
CAUTION
Turn off the power switch before threading the thread, otherwise the machine may operate if the
foot switch is depressed by mistake and serious injury could result.
Thread the upper thread correctly as shown in the illustration below.
* If the tension release lever q is raised in the direction of the arrow, it will be easier to open the tension disc
w and pull the thread through.
q
w
Approx. 40mm
21
LK3-B438E Mark II
[When using the liquid cooling tank]
7. CORRECT USE
7-4 . Winding the lower thread
CAUTION
Do not touch or place anything against any of the moving parts while winding the lower thread,
otherwise personal injury or damage to the machine may result.
1. Place the bobbin all the way onto the shaft.
2. Thread the thread as shown in the illustration at
right, wind the thread around the bobbin several times in the direction of the arrow, and then
press the bobbin presser q.
q
3. Turn on the power switch.
(The POWER indicator on the operation panel will
illuminate.)
4. Check that the button is not inserted and the needle does
not touch the button clamp, and then while pressing the
BOBBIN. WIND switch w, depress the foot switch e to
start the machine. Keep depressing the foot switch e until
the lower thread stops being wound onto the bobbin.
Release the BOBBIN. WIND switch w after the machine starts
operating. If you release the foot switch before winding is completed, depress it once more while pressing and holding the
BOBBIN. WIND switch w.
BOBBIN.WIND
e
w
5. The bobbin presser q will automatically return to its original position after a set amount of thread (80 90% of the bobbin capacity ) has been wound on.
6. Release the foot switch e.
7. Remove the bobbin,
hook the thread onto
the knife r, and then
pull the bobbin in the
direction of the arrow
to cut the thread.
8. To wind more thread onto
the bobbin, loosen the set
screw t and pull the bobbin presser q outward.
t
r
q
<< If the thread winds onto the bobbin unevenly >>
If the thread winds onto the bobbin unevenly, loosen
the nut q and turn the bobbin winder thread tension
stud w to adjust.
* If the thread winds on as shown in A, turn the bobbin winder thread tension stud w clockwise; if it
winds on as shown in B, turn the bobbin winder
thread tension stud w counterclockwise.
w
Case A
q
Case B
LK3-B438E Mark II
22
7. CORRECT USE
7-5. Replacing the bobbin case and threading the thread
CAUTION
Turn off the power switch before removing and replacing the bobbin case, otherwise the machine
may operate if the foot switch is depressed by mistake and serious injury could result.
w
r
e
30mm
q
Pull the shuttle race cover q toward Insert a new bobbin into the bobbin Pass the thread through the lever
you to open it.
case, and then pass the thread thread hole r, and then pull out apthrough the slot w and pull it out proximately 30 mm of thread.
from the thread hole e. Check that
the bobbin turns in the direction of
the arrow when the thread is pulled
at this time.
7-6 . Thread tension reference guide
Thread
#60 or equivalent
Thread take-up spring tension
(mm)
0.4 - 0.6
Upper thread tension (N)
0.7 - 1.3
Pre-tension (N)
0.1 - 0.3
Lower thread tension (N)
0.3 - 0.4
Needle
TQ × 1#12
Thread take-up spring height
(mm)
6-8
7-6-1 . Lower thread tension
7-6-2 . Upper thread tension
w
weaker
stronger
Stronger
Weaker
q
Stronger
Weaker
q
Adjust the thread tension to the weakest possible tension by turning the thread tension nut q until the bobbin case will not drop by its own weight while the
thread end coming out of the bobbin case is held.
23
Turn the tension nut q(main tension) to adjust the
tension as appropriate for the material being sewn.
Furthermore, turn the thread nut w(sub-tension) to adjust the remaining length of upper thread to 35 - 40
mm when the thread take-up lever is not used.
LK3-B438E Mark II
7. CORRECT USE
7-6-3 . Thread take-up spring height
Lower
7-6-4. Thread take-up spring tension
Higher
q
q
Loosen the set screw q and turn the tensioner body
to adjust the thread take-up spring height.
Stronger
Weaker
Turn the tension stud q with a screwdriver.
7-6-5. Adjusting arm thread guide R
Become
greater
A
Become less
q
The standard position of arm thread guide R q is when
the screw w is aligned with mark A.
To adjust the position, loosen the screw w and then
move arm thread guide Rq.
* When sewing thick material, move arm thread guide
Rq to the left. (The thread take-up amount will become greater.)
* When sewing thin material, move arm thread guide
Rq to the right. (The thread take-up amount will
become less.)
w
7-6-6. Thread take-up amount
Loosen the screw q and move the stopper (3.57 nut)
w to adjust the operating angle of the thread take-up
solenoid e.
* To reduce the thread take-up amount, move the
stopper w upward.
* To increase the thread take-up amount, move the
stopper w downward.
w
Become less
Become greater
q
e
LK3-B438E Mark II
24
7. CORRECT USE
7-7. Inserting the button
1. Press the cam plate q to open the button holder
w.
2. Insert the button, making sure that the button is
facing the directing shown in the illustration, then
release the cam plate q.
q
w
7-8. Adjusting the button holder
0.5 - 1.0mm
q
w
1. Insert the button in the button holder. Confirm that
the button is securely held by the holder.
2. Loosen the set screw q, while the button is held
by the holder. Move the adjusting plate w so that
the space between the adjusting plate w and screw
e is approximately 0.5 - 1.0 mm, then tighten the
set screw q.
e
7-9. Adjustment by the accessory spring
w
If you would like the button to be raised up more after
it is sewn, install the accessory spring.
q
1. Install the spring support q with the bolt w.
2. Install the spring e with the washer r and the
screw t.
e
r
t
25
LK3-B438E Mark II
8. SEWING
8. SEWING
CAUTION
Turn off the power switch at the following times, otherwise the machine may operate if the foot
switch is depressed by mistake, which could result in injury.
• Threading
• When replacing the needle
• When not using the machine and when leaving the machine unattended.
Do not touch any of the moving parts or press any objects against the machine while sewing, as
this may result in personal injury or damage to the machine.
Before starting sewing ......
• Check that the needle bar is at its highest position.
Turn the machine pulley so that the index mark q
on the pulley is between the marks w on the belt
cover.
* If the machine pulley stop position is incorrect,
error “E-50” may be displayed, or the wiper may
come into contact with the needle and break the
tip of the needle.
q
w
1. Turn on the power switch.
(The POWER indicator will illuminate and the program number will flash in the display.)
2. Depress the foot switch to the 2nd step.
The feed mechanism will move to the starting
position and the button clamp will rise.
* Note that if the foot switch is pressed to the
2nd step while the display is illuminated, the
machine will start operating.
3. Insert the button to the button holder.
1st Step
2nd Step
(Refer to “7-7. Inserting the button”.)
4. Place the material to be sewn under the button clamp,
and then depress the foot switch.
When the foot switch is pressed to the 1st step, the
button clamp will lower.
If you would like to shift the position of the material,
release the foot switch. The button clamp will then
rise again.
When the foot switch is pressed to the 2nd step, the
machine will start operating.
* When sewing programs which do not use crossver
stitches (program Nos. 14, 15, 20, 22, 28, 29, 32, 33,
35), press the foot switch twice, or keep pressing it
until the second sewing operation starts.
5. Once sewing is completed and the thread has been trimmed, the button clamp will rise.
LK3-B438E Mark II
26
9 . MAINTENANCE AND INSPECTION
9 . MAINTENANCE AND INSPECTION
CAUTION
Turn off the power switch before carrying out cleaning, otherwise the machine may operate if the
foot switch is pressed by mistake, which could result in injury.
Be sure to wear protective goggles and gloves when handling the lubricating oil and grease, so
that they do not get into your eyes or onto your skin, otherwise inflammation can result.
Furthermore, do not drink the oil or eat the grease under any circumstances, as they can cause
vomiting and diarrhoea. Keep the oil out of the reach of children.
9-1 . Cleaning the rotary hook
1. Pull the shuttle race cover toward you to open it,
and then remove the bobbin case.
2. Open the setting claw q in the direction indicated
by the arrow, and then remove the shuttle race
body w and the shuttle hook e.
e
w
q
3. Clean all the dust and thread ends from around
the driver r, the top of the rotary hook thread
guide and the shuttle race.
r
27
LK3-B438E Mark II
9 . MAINTENANCE AND INSPECTION
9-2. Lubrication
NOTE1:
NOTE2:
NOTE3:
NOTE4:
Fill the machine with oil when the oil level is down to about one-third full in the oil sight glass.
If oil is not added and the oil drops below this level, there is the danger that the machine may seize during
operation.
Be sure to let the machine operate for a while after adding the oil.
If there is no more oil on the felt of the shuttle race base, problems with sewing may result, so add oil to the felt
until it is slightly soaked.
Use only specified Brother oil (Nisseki Sewing Libe 10) for the machine oil.
1. Fill the arm-side oil tank with oil.
* When setting up the sewing machine and when
it hasn't been used for an extended period of
time, be sure to add 2-3 drops of oil at the place
indicated by the arrow.
2. Fill the bed-side oil tamk with oil.
3. Add oil to the felt q of the shuttle race base.
* When setting up the sewing machine and when
it hasn’t been used for an extended period of
time, be sure to add 2-3 drops oil to the felt.
q
4. If using the liquid cooling tank w, fill it with silicon
oil (100 mm2/s).
w
LK3-B438E Mark II
28
9 . MAINTENANCE AND INSPECTION
9-3 . Draining the oil
1. Remove and empty the waste oil container q
whenever it is full.
2. After emptying the waste oil container q, screw it
back into its original position.
q
9-4 . Cleaning the control box air inlet port
Use a vacuum cleaner to clean the filter in the air inlet
port w of the control box q at least once a month.
w
q
* If the machine is used while the air inlet port is
blocked, the inside of the control box will overheat.
When this happens, the overheating error code (“Ed0”) will be displayed and you will not be able to
operate the sewing machine.
9-5 . Cleaning the eye guard
Wipe the eye guard clean with a soft cloth.
NOTE:
Do not use solvents such as kerosene or thinner to clean
the eye guard.
9-6 . Checking the needle
Always check that the tip of the needle is not broken
and also the needle is not bent before starting sewing.
29
LK3-B438E Mark II
10 . STANDARD ADJUSTMENTS
10 . STANDARD ADJUSTMENTS
CAUTION
Maintenance and inspection of the sewing
machine should only be carried out by a qualified technician.
Hold the machine head with both hands
when tilting it back or returning it to its original position. Furthermore, after tilting back
the machine head, do not push the face
plate side or the pulley side from above, as
this could cause the machine head to topple
over, which may result in personal injury or
damage to the machine.
Ask your Brother dealer or a qualified electrician to carry out any maintenance and inspection of the electrical system.
Turn off the power switch and disconnect the
power cord from the wall outlet at the following times, otherwise the machine may operate if the foot switch is depressed by mistake,
which could result in injury.
· When carring out inspection, adjustment and
maintenance
· When replacing consumable parts such as
the rotary hook and knife
If the power switch needs to be left on when
carrying out some adjustment, be extremely
careful to observe all safety precautions.
If any safety devices have been removed,
be absolutely sure to re-install them to their
original positions and check that they operate correctly before using the machine.
10-1 . Adjusting the needle bar height
q
w
e
A
TQ × 1
Turn the machine pulley to move the needle bar to the lowest position. Then remove the rubber plug w,
loosen the set screw e and then move the needle bar up or down to adjust so that the highest reference line
(reference line A) is aligned with the lower edge of the needle bar bush q.
10-2 . Adjusting the needle bar lift amount
t
q
w
t
e
r
B
TQ × 1
t
y
e
Adjust the needle bar lift amount as described below so that the tip of the rotary hook is aligned with the
center of the needle when the machine pulley is turned to raise the needle bar from its lowest position until
the second reference line from the top of the needle (reference line B) is aligned with the lower edge of the
needle bar bush q.
1. Open the support w in the direction of the arrow, and remove the felt support e.
2. Loosen the screw r , and move the driver to adjust so that the tip of the rotary hook is aligned with the
needle center line.
* When returning the felt support e, place it as shown in the illustration so as not to clamp the felt t, and
then gently press the felt t and the wick y until they are at the same height as the rotary hook race.
* Return the support w to its original position.
LK3-B438E Mark II
30
10 . STANDARD ADJUSTMENTS
10-3 . Adjusting the driver needle guard
Needle center line
Tip
q
e
w
Turn the machine pulley to align the tip of the rotary hook with the needle center line. Then loosen the set
screw w and turn the eccentric shaft e to adjust so that the driver needle guard q contacts the needle.
If the needle contact pressure is too great, skipped stitches may occur. On the other hand, if the driver needle
guard qis not touching the needle, the tip of the inner rotary hook will obstruct the needle, resulting in an
excessively high amount of friction.
10-4 . Adjusting the needle clearance
q
0.01 - 0.08mm
w
Turn the machine pulley to align the tip of the rotary hook with the needle center line. Then loosen the set
screw q and turn the eccentric shaft w to adjust so that the clearance between the needle and the rotary hook
is 0.01 - 0.08 mm.
10-5 . Adjusting the shuttle race thread guide
q
Install the shuttle race thread guide q by pushing it in the direction of the arrow so that the needle groove is
aligned with the center of the needle plate hole.
NOTE:
If the shuttle race thread guide is in the wrong position, thread breakages, soiled thread or catching of the thread may
occur.
31
LK3-B438E Mark II
10 . STANDARD ADJUSTMENTS
10-6.Adjusting the thread take-up amount
q
Thread take-up amount (stroke)
e
Become less
Become greater
w
q
r
At the time of shipment from the factory, the thread take-up amount (stroke) of the thread take-up lever q is
set to the standard setting of 5 mm. You may need to adjust this setting depending on the sewing conditions
to prevent the thread from pulling out at the sewing start.
[Adjustment method]
Loosen the screw w and move the stopper (3.57 nut) e to adjust the operating angle of the thread take-up
solenoid r.
* To reduce the thread take-up amount, move the stopper e upward.
* To increase the thread take-up amount, move the stopper e downward.
NOTE:
Do not increase the stroke of the thread take-up lever any more than is necessary.
If the sub-thread tension is too high, the needle thread length may become too short and the thread may come out of
the needle. Furthermore, if the sub-thread tension is too weak, the needle thread length may become too long and the
underside of the article being sewn may become untidy.
10-7 . Adjusting the movable knife
q
B
A
e
w
Loosen the nut w and move the connecting rod lever e to the left or right to adjust so that the V section A is
aligned with the index bark B on the needle plate when the sewing machine in the stopped position and the
movable knife q is moved toward the index mark.
LK3-B438E Mark II
32
10 . STANDARD ADJUSTMENTS
10-7-1 . Replacing the movable knife and fixed knife
q
w
y
e
t
y
r
i
u
1. Open the large shuttle hook cover, remove the screws q and w, and then remove the feed plate e.
2. Remove the two screws r and the two screws t, and then remove the needle plate y.
3. Remove the thread trimmer connecting rod u from the connecting rod lever pin i.
!2
o
!3
!1
!0
0.5mm
!0
4. Remove the movable knife o and replace it with a new one. At this time, check that the movable knife o
and the fixed knife !0 cut the thread cleanly. If necessary, adjust by using the appropriate movable knife
washer !1 (supplied as accessories).
* Apply grease to the outside of the collar !2 at this time.
5. Install the fixed knife !0 at a distance of 0.5 mm from the needle hole plate !3 .
6. Place the thread trimming connecting rod uonto the connecting rod lever pin i, and then install to the
needle plate y.
33
LK3-B438E Mark II
10 . STANDARD ADJUSTMENTS
10-7-2. Adjusting the engagement of the movable knife and fixed knife
Fig. 1
B
A
Movable knife
D
C
Cutting
edge
Fix knife
Cutting
edge
Cutting
edge
Cutting
edge
A. After the movable knife and fixed knife are properly engaged, tighten the screw as shown in Fig.1.
B. Turn the movable knife (in the direction of the arrow) while the screw is still tightened.
C. Loosen the screw.
D. Turn the movable knife (in the direction of the arrow) while the screw is still loosened.
Repeat above steps A, B, C and D four or five times to maintain the cutting performance of the knife.
10-8 . Adjusting the button clamp lift amount
The maximum button clamp lift amount is 13 mm from the top of the needle plate.
(The lift amount is adjusted 10 - 11 mm at the time of shipment.)
e
w
q
13mm
Remove the button clamp presser spring q, loosen the screw w and adjust the button clamp holder hook e
by moving it up and down.
* If the button clamp lift amount is too large, the button clamp will not be raised.
* If the button clamp cannot be raised or lowered, error code “E-61” or “E-63” will be displayed.
LK3-B438E Mark II
34
10 . STANDARD ADJUSTMENTS
10-9. Adjusting the holding pressure
Loosen the adjusting nut q and turn the adjusting nut
w to the point where it is just tight enough that the
material will not slip out of place when it is slightly
pulled (keep pressure as slight as possible).
w
q
10-10. Adjusting the position of the button holder
1. Loosen the two hexagonal bolts q and adjust the
button holder body w by moving it.
2. Check that the needle will go through the button
hole with no contact. (Refer to “6. CHECKING THE
SEWING PATTERN”.)
q
w
35
LK3-B438E Mark II
10 . STANDARD ADJUSTMENTS
10-11. Adjusting the needle up stop position
The needle up stop position is adjusted so that the
index mark w on the machine pulley q is inside the
mark r on the belt cover e.
If adjustment is necessary, loosen the screw t at the
“U” mark of the machine pulley q and adjust the position of the machine pulley q. The machine pulley q
stops later if it is turned clockwise, and it stops earlier
if it is turned counterclockwise.
e
r
q
w
t
y
u
NOTE:
The screw y at the “D” mark is an adjusting screw for
the needle down detection function and is adjusted to
match the feed timing, so it should not be loosened.
The screw u is a screw for detecting the machine stop
position, and should not be loosened.
* If the index mark w is not inside the mark r when
the sewing machine is started, error code “E-50”
will be displayed. Turn the machine pulley to move
the index mark w to the correct position and then
start the sewing machine.
10-12. Adjusting the thread wiper
w
e
r
q
t
2±0.5mm
(Approx.
30mm)
Approx.
20mm
1. Loosen the set screw w and move the wiper arm support e up or down to adjust so that the clearance
between the top of the thread wiper and the needle point q is 2 ± 0.5 mm when the thread wiper is aligned
with the center of the needle.
* Before carrying out this adjustment, check that the needle bar is lowered 3.5 to 4 mm from the needle up
stop position when the sewing machine stops.
2. Loosen the screw r and move the thread guide connecting plate t up or down so that the thread wiper
is approximately 20 mm from the needle when it is at the standby position.
LK3-B438E Mark II
36
10 . STANDARD ADJUSTMENTS
10-13. Checking the input sensor and DIP switch input
B430E
POWER
q
P
Series
PROGRAM NO.
P1
P2
P3
P4
X-SCALE
e
RESET
Y-SCALE
SPEED
w
TEST
BOBBIN.WIND
COUNTER
r
SELECT
t
1. When the X-SCALE indicator q is illuminated and the RESET switch e is pressed while the TEST switch w
is being pressed, the state of the X home position signal will appear on the display window r.
· When sensor is ON
· When sensor is OFF
2. Each time the SELECT switch t is pressed, a different indicator will illuminate and the operating condition
for the corresponding item will appear on the display window r.
· When X-SCALE indicator is illuminated ........ X home position sensor (ON when home position detected)
· When Y-SCALE indicator is illuminated ........ Y home position sensor (ON when home position detected)
· When SPEED indicator is illuminated ........... Synchronizer ( * 1)
· When COUNTER indicator is illuminated ..... Presser sensor (ON when presser is lowered)
* 1 The synchronizer display simultaneously displays the needle up signal (3rd digit), the 24-section signal
(2nd digit) and the needle down signal (1st digit).
[ H L L]
“H” when the sensor is on, and “L” when the sensor is off
Needle down signal
24-section signal
Needle up signal
If the DIP switches at the side of the operation panel are changed at this time, the number of the DIP switch
which was changed will be displayed in the 4th digit position of the display window r for about one
second.
NOTE:
The DIP switch can be changed at this time without turning off the power so that you can check the DIP switch input.
However, you should normally always turn off the power when changing DIP switch settings.
3. Press the TEST switch w again to return the display to the normal condition.
37
LK3-B438E Mark II
10 . STANDARD ADJUSTMENTS
10-14. Checking the input voltage
B430E
P
Series
PROGRAM NO.
POWER
P1
P2
P3
P4
X-SCALE
r
w
RESET
Y-SCALE
SPEED
e
TEST
t
COUNTER
BOBBIN.WIND
SELECT
q
Specifications
Display
200V
[090 - 110]
220V
[100 - 120]
230V
[105 - 125]
100V
380V
400V
415V
[100 - 120]
Notes
“100” is displayed when the input voltage is 200 V.
“110” is displayed when the input voltage is
100V (for 100-V spece.), 380V (for 380-V spece.),
400V (for 400-V spece.)or 415V (for 415-V spece.).
1.
2.
3.
4.
Turn on the power switch.
Press the SELECT switch q until the Y-SCALE indicator w illuminates.
While pressing the TEST switch e, press the RESET switch r.
If the input voltage is normal, the input voltage conditions will be shown in the display window t as
indicated in the table above.
5. Press the TEST switch e again to return the display to the normal condition.
10-15. Clearing all memory settings
If the sewing machine stops operating normally, the cause may be that an incorrect memory setting may have
been made by means of the memory switch, for instance. In such cases, carry out the following procedure to
clear the memory, and also check the DIP switch settings.
[ Method ]
While pressing the RESET switch, turn on the power. This will clear all of the memory setting.
NOTE
• This operation causes all settings stored in memory such as memory switch and user program settings to be cleared.
• If the optional emergency stop switch has been installed, you should reset memory switch No. 10 to ON.
LK3-B438E Mark II
38
10 . STANDARD ADJUSTMENTS
10-16 . Moving stitch patterns
· Programs which have already been programmed can be moved up, down and to the left and right. (However, such patterns will be reset if the power supply is turned off or the program number is changed.)
· The feed position can be set to the any position desired.
B430E
w
P
POWER
r
t
e
RESET
Series
PROGRAM NO.
u
P1
P2
P3
P4
X-SCALE
i
Y-SCALE
SPEED
TEST
BOBBIN.WIND
COUNTER
y
SELECT
q
o
1. Select the program number, and then press the start switch once to move the feed mechanism to the
sewing start position.
2. Press the SELECT switch q until the PROGRAM NO. indicator w illuminates.
3. While pressing the TEST switch e, press the RESET switch r .
* The TEST indicator t will illuminate and <
> will appear in the display window y.
4. Press the SELECT switch q so that either the X-SCALE indicator u or Y-SCALE indicator i illuminates.
5. Press the DISPLAY SET switches o to move the feed mechanism one pulse at a time.
• If the DISPLAY SET ( ) switch is pressed while the X-SCALE indicator is illuminated, the feed mechanism will move to the left.
• If the DISPLAY SET ( ) switch is pressed while the X-SCALE indicator is illuminated, the feed mechanism will move to the right.
• If the DISPLAY SET ( ) switch is pressed while the Y-SCALE indicator is illuminated, the feed mechanism will move down.
• If the DISPLAY SET ( ) switch is pressed while the Y-SCALE indicator is illuminated, the feed mechanism will move up.
6. When the TEST switch e is pressed after the above fine adjustments have been made, the TEST indicator
t and display window y will both switch off and movement of the stitch pattern will be completed.
NOTE:
When moving the stitch pattern, take the whole of the pattern area into consideration so that no parts extend outside
the sewing area when the pattern is sewn.
* If you would like to set the feed position to a desired position, carry out steps 2. to 6. above while the display window
y is flashing. The stitch pattern will not be moved at this time.
39
LK3-B438E Mark II
11 . USING THE COUNTERS
11. USING THE COUNTERS
11-1 . Using the bobbin thread counter
If you use the bobbin thread counter to set the number of articles which can be sewn with the amount of
bobbin thread available, you can stop the bobbin thread running out in the middle of sewing a pattern.
1. Press the SELECT switch q until the COUNTER
indicator w illuminates.
2. While pressing the TEST switch e, press the RESET switch r.
* The COUNTER indicator w will flash and the
B430E
Series
counter will switch to bobbin thread counter setting mode.
P PROGRAM NO.
3.
Press
the DISPLAY SET switches t to set the numP1
P2
POWER
ber of articles to be sewn.
X-SCALE
• The bobbin thread counter can be set to sew a
r
P3
P4
RESET
Y-SCALE
number of articles from one (“0001”) through to
9999 (“9999”).
SPEED
If the bobbin thread counter is set to “0000”,
w
e
y
TEST
COUNTER
sewing is carried out without the number of articles sewn being counted.
•
If you press the RESET switch r while setting
S
E
L
E
C
T
BOBBIN.WIND
the bobbin thread counter, the setting will return
to “0000”.
t
q
4. Press the TEST switch e.
* The number displayed in the display window y
will then be stored as the bobbin thread counter
setting.
5. Each time the sewing of a single article is completed, the number being displayed in the display window y
will become smaller. When the number of articles set by the bobbin thread counter have all been sewn,
“0000” will be displayed in the display window y, and an alarm will start sounding continuously.
* The sewing machine will not operate during this time, even if the foot switch is depressed.
6. Replace the bobbin, and then press the RESET switch r.
* The alarm will then stop sounding, and the number which was set in step 3. above will be re-displayed in
the display window y.
11-2 .Using the production counter
The production counter can be displayed in the display window y separately from the bobbin thread counter.
B430E
P
Series
PROGRAM NO.
POWER
P1
P2
P3
P4
X-SCALE
r
RESET
Y-SCALE
w
e
TEST
BOBBIN.WIND
SPEED
t
COUNTER
y
SELECT
q
u
1. Press the SELECT switch q until the SPEED indicator w illuminates.
2. While pressing the TEST switch e , press the RESET switch r .
* The COUNTER indicator t and the SPEED indicator w will illuminate, and the production
counter will be displayed in the display window
y.
• Press the RESET switch r to reset the production counter to “0000”.
• You can also press the DISPLAY SET switches
u to set the production counter to the desired
value.
3. When the foot switch is depressed, the sewing machine will start sewing.
4. If you press the TEST switch e or the SELECT
switch q, the display will return to showing the
bobbin thread counter.
LK3-B438E Mark II
40
12 . CHANGING FUNCTIONS USING THE DIP SWITCHES
12. CHANGING FUNCTIONS USING THE DIP SWITCHES
12-1. Operation panel DIP switches
The operation panel DIP switches q are used to
change functions which might need to be changed
depending on the sewing conditions.
NOTE:
Always turn off the power before setting the DIP
switches.
The functions shown in the table below can be
changed by means of these DIP switches.
* All DIP switches are set to OFF at the time of shipment.
q
Motion when set to ON
Switch
DIPA-1
Presser does not automatically lift after sewing
is completed.
DIPA-2
Two-pedal mode is available.
DIPA-3
User program mode is available.
DIPA-4
–
DIPA-5
DIPA-7
The presser does not rise automatically when a split is found.
Displays the enlargement/reduction ratio in millimeter units instead of as a
percentage. (After changing this setting, be sure to carry out the auto-clear
operation by referring to page 38.)
Enlargement of pattern size is not available.
DIPA-8
Program number is fixed.
DIPA-6
See “12-2. Setting the presser
mode”
12-2. Setting the presser mode
Through the combination of DIP switches A-1 and A-2 on the operation panel, presser motions can be set as
follows:
DIPA-1
41
DIPA-2
Pedal specifications
Raising the presser at the sewing end
-
-
Single pedal
Presser is raised automatically.
ON
-
Single pedal
Presser is raised by pressing the pedal.
-
ON
Two pedals
Presser is raised automatically, then it is lowered by
pressing the pedal.
ON
ON
Two pedals
Presser is kept lifted while the pedal is pressed.
LK3-B438E Mark II
12 . CHANGING FUNCTIONS USING THE DIP SWITCHES
12-3 . DIP switches inside the control box
DANGER
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from
the wall outlet before opening the face plate of the control box. Touching areas where high voltages are present can result in severe injury.
The DIP switches q inside the control box are used to
change functions which do not often need to be
changed once they have been set.
The functions can be changed as shown in the table
below by changing the positions of the DIP switches
q.
* All DIP switches are set to OFF at the time of shipment.
NOTE:
When opening the cover, hold it securely so that it does
not fall down.
q
Motion when set to ON
Switch
DIPB-1
First two stitches are sewn at a low speed of 260 rpm.
DIPB-2
Last two stitches are sewn at a low speed of 260 rpm.
DIPB-3
–
DIPB-4
Last two stitches are sewn at a low speed of 700 rpm.
DIPB-5
First two stitches are sewn at a low speed of 400 rpm.
DIPB-6
Low speed sewing is not performed at the start of sewing.
DIPB-7
The motor operates in reverse when the upper shaft stops, to return the needle
bar to close to its highest position.
DIPB-8
Area checking of the sewing data is not carried out.
LK3-B438E Mark II
42
12 . CHANGING FUNCTIONS USING THE DIP SWITCHES
12-4. Using user programs
User program ...
It can store sixteen different programs which can include details such as the program number, X scale, Y
scale and sewing speed. If you are sewing certain patterns over and aver again, it is useful to record the
settings for these patterns into a user program.
Recording a user program
1. Turn off the power switch and then set DIP switch
A-3 of the DIP switches q to ON.
B430E
r
POWER
2. Turn on the power switch.
While pressing the TEST switch w, press the SELECT switch e.
* All of the menu indicators (r to i) will illuminate and the
mode will switch to recording mode.
* In addition, “PP 1” will appear in the display window o to
indicate that user program No.1 is being recorded. (Once
recording of No.1 is completed, No.2 will be displayed; once
No.2 is completed, No.3 will be displayed. Thus the next
unrecorded program letter is always displayed.)
!2
RESET
t
!1
P
TEST
BOBBIN.WIND
PROGRAM NO.
P1
P2
P3
P4
X-SCALE
y
Y-SCALE
u
w
Series
SPEED
i
o
COUNTER
SELECT
!0
e
q
3. Press the SELECT switch e .
* The PROGRAM NO. indicator r will illuminate.
4. Press the DISPLAY SET switches !0 to select the number for the program that you would like to record.
5. Press the SELECT switch e.
* The X-SCALE indicator t will illuminate.
6. Press the DISPLAY SET swithes !0 to select the X scale setting that you would like to record.
7. Press the SELECT switch e.
* The Y-SCALE indicator y will illuminate.
8. Press the DISPLAY SET switches !0 to select the Y scale setting that you would like to record.
9. Press the SELECT switch e.
* The SPEED indicator u will illuminate.
10. Press the DISPLAY SET switches !0 to select the speed setting that you would like to record.
11. Press the SELECT switch e.
* This completes the recording of user program No.1.
* “PP 2” will then appear in the display window o, to indicate that user program No.2 is now being recorded.
Repeat steps 3. through to 11. to record further programs as desired.
12. Press the TEST switch w. This completes the recording.
* The menu indicators ( e to i ) will all illuminate and “p1” will appear in the display to indicate that user program No.1 is currently
selected.
43
LK3-B438E Mark II
12 . CHANGING FUNCTIONS USING THE DIP SWITCHES
Using a user program
1. Press the DISPLAY SET switches !0 to select the speed program number for the user program that you
would like to use.
*The user program numbers P1 to P4 can also be selected using the user program switches !1.
2. Depress the foot switch to the second step.
3. Check the sewing pattern (see P.20), and then sew the pattern selected.
Clearing the user programs
1. Switch the machine to recording mode by the procedure in steps 2. of recording a user program.
2. Use the DISPLAY SET switches !0 to specify the user program number which is to be cleared of data.
3. Press the RESET switch !2 .
* The buzzer will sound and the user program with the number selected will be cleared.
* If you press and hold the RESET switch !2 until after the buzzer has sounded twice, all user programs
will be cleared.
NOTE:
If data has been recorded in user programs P1, P2, P3 and P4 and you then clear the data in user program P2, the
contents of P3 will be transferred to P2, and the contents of P4 will be transferred to P3.
LK3-B438E Mark II
44
13. CHANGING SPECIAL FUNCTIONS USING THE MEMORY SWITCHES
13. CHANGING SPECIAL FUNCTIONS USING THE MEMORY SWITCHES
The functions of the switches on the operation panel q can be changed to carry out special functions.
NOTE:
After changing the memory switch settings, press the power switch to turn the power off and then back on again.
The memory switches “00 - 2F” (except “08”) are set to OFF at the time of shipment.
1. Turn on the power switch.
2. While pressing the TEST switch w, press the BOBBIN. WIND switch e.
* “00 - - ” will appear in the display window r.
3. Press the DISPLAY SET switches t to set the two
digits at the left of the display window r to the
corresponding number (00 to 4F) of the function
shown in the table below that you would like to
select.
4. When the BOBBIN. WIND switch e is pressed, the
two spaces at the right in the display window will
change from “ - - ” to “ON”.
* If you press the RESET switch y at this time,
memory switches from 00 to 2F will all be set to
OFF (“--”), and memory switches from 30 to 4F
will be returned to their initial settings.
5. Press the TEST switch w .
* The display will return to normal.
■Memory switches 00 - 0F
B430E
P
Series
PROGRAM NO.
POWER
P1
P2
P3
P4
X-SCALE
q
RESET
Y-SCALE
SPEED
w
e
TEST
BOBBIN.WIND
COUNTER
SELECT
t
Motion when set to ON
Switch
memo-00
At the end of sewing, the feed plate will be returned to the sewing start point via
mechanical home position.
memo-01
Button clamp will move to the sewing start point, and then will be lifted.
(The button clamp rises at the final stitch to enable the quick taking out of the
workpieces.)
memo-02
Feed will move automatically to the next starting point at the same time as a user
program is switched.
(Normally it moves to the starting point after sewing starts.)
memo-03
When sewing using programs, the programs which have been set will be sewn in
numerical order. (Cycle sewing mode is set.)
memo-04
The sewing speed will be fixed at the minimum speed for the maximum pitch of the
sewing data.(Set this to ON if you are concerned that vartations in pitch may cause
changes in the sewing speed.)
memo-05
memo-06
memo-07
memo-08 *
Increases the presser solenoid lifting force
Enlargement and reduction ratio settings for X and Y become the same.
–
Test feeding is carried out stitch by stitch when the foot switch is depressed.
memo-09
The sewing start point becomes the reference point for enlargements and
reductions.(The reference point for enlargements and reductions is normally the
center of the sewing frame.)
memo-0A
memo-0b
–
–
memo-0c
Needle stops in up position during emergency stop.
(EMERGENCY STOP switch is available as an option.)
memo-0d
The bar tacking stitches (with a pitch of less than 1 mm) are also enlarged and
reduced. (Normally stitches with a pitch of less than 1 mm are not enlarged or
reduced.)
memo-0E
Test feeding will be performed at the same speed as that for actual sewing.
(This is used for checking feeding operation.)
memo-0F
After sewing is finished, the work clamp automatically opens and closes once
(practice operation).
* Set to ON at the time of shipment from the factory, and when all memory settings are initialized.
45
r
LK3-B438E Mark II
13. CHANGING SPECIAL FUNCTIONS USING THE MEMORY SWITCHES
■ Memory switches 10 - 1F
Motion when set to ON
Switch
memo-10
The optional emergency stop switch can be used.
memo-11 - memo-13
—
memo-14
Solenoid wiper can be used (available as an option).
memo-15
—
memo-16
Needle cooler output is enabled. (Needle cooler is available by special order.)
memo-17
Thread take-up device is not operated at the sewing end.
memo-18
Thread take-up device operates one stitch before the sewing end.
memo-19
Presser position errors are not detected.
memo-1A
Needle up stop position errors are not detected.
memo-1b
Presser can be moved up and down before the home position is detected.
(Normally the presser cannot be moved up and down until after the home position has
been detected.)
memo-1c
—
memo-1d
—
memo-1E
Errors can be reset using the EMERGENCY STOP switch. (EMERGENCY STOP switch is
available as an option.)
memo-1F
Thread is not trimmed when an emergency stop occurs during sewing. (EMERGENCY
STOP switch is available as an option.)
■ Memory switches 20 - 2F
Switch
Motion when set to ON
memo-20
Machine head from previous B430E series is used. (Only the operation panel and box are
Mark II.)
memo-21
Rotating-type thread breakage detector operates. (Device is available by special order.)
memo-22
During thread breakage detection, sensitivity is decreased from 8 to 14 stitches at the
sewing start. (Sensitivity during sewing is three stitches.)
memo-23
When DIP switch A-8 is simultaneously ON, setting values changed using the operation
panel are ignored.
memo-24 - memo-2F
—
■ Memory switches 30 - 4F
30 to 4F are set by entering two-digit values.
These values are incremented using the P2 switch, and decremented using the P4 switch.
Switch
Possible setting range
Units
Initial value
memo-30
0 - 30
mm
7
Limits the maximum area in the horizontal direction (X)
(Limited to 6.4 mm when settings have been initialized.)
memo-31
0 - 30
mm
7
Limits the maximum area in the vertical direction (Y)
(Limited to 6.4 mm when settings have been initialized.)
memo-32
12 - 27
× 100rpm
25
Changes the maximum sewing speed.
memo-33
1 - 15
× 7.5°
10
Changes the feed timing
1 (Fast) ←10 (Standard) →15 (Slow)
memo-34
0-5
Needle
1
The sewing speed at the sewing start is 400 rpm for the
specified number of stiches.
memo-35
3-9
× 100rpm
4
Changes the sewing start speed specified by memo-34.
memo-36
—
—
—
—
memo-37
1 - 20
× 7.5°
10
Changes the feed timing one stitch before the sewing end.
1 (Fast) ←10 (Standard)→20 (Slow)
memo-38
1 - 20
× 7.5°
10
Changes the feed timing two stitches before the sewing
end.
memo-39
1 - 20
× 7.5°
1
Changes the feed timing for the third stitch at the sewing start.
1 (Fast) ←10 (Standard) →20 (Slow)
memo-3A
1 - 20
× 7.5°
1
Changes the feed timing for the second stitch at the sewing start.
memo-3b
1 - 20
× 7.5°
1
Changes the feed timing for the first stitch at the sewing start.
memo-3c
—
—
—
—
memo-3d
—
—
—
—
memo-3E
—
—
—
—
memo-3F
—
—
—
—
memo-40
memo-4F
—
—
—
—
Explanation
LK3-B438E Mark II
46
13. CHANGING SPECIAL FUNCTIONS USING THE MEMORY SWITCHES
13-1. Using the cycle sewing function
What is the cycle sewing function?
The cycle sewing function lets you program up to four patterns for cycle sewing of patterns in a predeter
mined order.
Recording a cycle sewing program
q
1. Set DIP switch q-3 to ON, and then record the
patterns which you would like to use for cycle
sewing. (Refer to “12-4. Using user programs”.)
* Cycle sewing cannot be performed using patterns (P1 to P16)
which have not had a user program assigned.
2. Set the memo-03 switch to ON. (Refer to page 45
for how to do this.)
B430E
r
3. While pressing the TEST switch w, press the SELECT switch e.
POWER
!2
* All of the menu indicators (r to i) will illuminate and the
RESET
t
P
w
4. Press the P1 switch o.
• “Pc 1” will appear in the display window !0 to
indicate that cycle sewing program No. 1 is being recorded.
TEST
BOBBIN.WIND
PROGRAM NO.
o
P1
P2
P3
P4
X-SCALE
y
Y-SCALE
u
mode will switch to recording mode.
Series
SPEED
i
!0
COUNTER
SELECT
e
!1
* Programs P2, P3 and P4 switches can also be used for programming.
5. Press the SELECT switch e. *The PROGRAM No. indicator r will illuminate and “1- -” will appear in the display window !0.
6. Press the DISPLAY SET switches !1 to select the number for the user program that you would like to
record.
7. Press the SELECT switch e. *“2- -” will appear in the display window !0 .
8. Press the DISPLAY SET switches !1 to select the number for the user program that you would like to
record.
9. Repeat steps 5. and 6. to record all programs which you would like to include for cycle sewing.
* After “9- -” is displayed, “A- -”, “b- -”, “c- -”, “d- -”, “E- -” and “F- -” will be displayed in that order so that up to the 15th pattern can
be recorded.
* If you would like to return to a previous number during the recording procedure, press the P1 switch so that “Pc 1” is displayed, and
then return to step 4.
10. Press the TEST switch w.
• This completes the setting of cycle sewing program No. 1.
* The menu indicators (r to i) will all illuminate and “c1-1” will appear in the display window !0 to indicate that the cycle sewing
program No.1 is currently selected.
47
LK3-B438E Mark II
13. CHANGING SPECIAL FUNCTIONS USING THE MEMORY SWITCHES
Using a cycle sewing program
1. When “c1-1” is flashing in the display window !0 , press the foot switch to the second step.
2. Start sewing.
3. “c1-1”, “c1-2”, “c1-3” are sewn in order for each article, and when the last-recorded pattern has been
sewn, the display returns to “c1-1”.
* If you press one of the DISPLAY SET switches !1 when “c1-*” is displayed, you can return to the previous stitch pattern or skip a
stitch pattern.
* If you press the SELECT switch e when “c1-*” is displayed, you can check the contents of the recorded user program.
Clearing a cycle sewing program
1. Switch the machine to recording mode by the procedure in step 3. of recording a user program.
2. Use one of the P* switches (user program switches) to specify which cycle sewing program to clear.
* Press the P1 switch o if you would like to clear cycle sewing program No. 1. (“Pc 1” will be displayed.)
3. Press the RESET switch !2.
* The recorded contents of the specified cycle sewing program will then be cleared.
* If you press and hold the RESET switch !2 until after the buzzer has sounded twice, all cycle sewing programs will be cleared.
NOTE:
If you clear a user program after any cycle sewing programs have been recorded, all recorded cycle sewing programs
will also be cleared.
LK3-B438E Mark II
48
14. TABLE OF ERROR CODES
14. TABLE OF ERROR CODES
DANGER
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from
the wall outlet before opening the face plate of the control box. Touching areas where high voltages are present can result in severe injury.
If a malfunction should occur with the sewing machine, a buzzer will sound and an error code will appear in
the display window. Follow the remedy procedure to eliminate the cause of the problem.
Code
Remedy
Cause
E-13
Machine specification select connector is
not connected properly.
Turn off the power and check if connectors P3 is
disconnected.
E-20
Problem with machine motor stopping, or
synchronizer connection error.
Turn off the power, and then turn the machine
pulley to check if the machine has locked up. Check
the synchronizer connection. Check if connectors
P11, P12 and P13 are disconnected.
E-21
Machine motor operation error.
Turn off the power and check the ground wire
connection.
E-30
Data is outside possible sewing area due
to enlargement ratio setting.
Press the RESET switch, and then set the
enlargement ratio again.
E-31
Stitch pattern data overlaps the sewing
area when area limiting is active.
Press the RESET switch, and then reset the memory
switches “30” and “31” or enlargement ratio.
E-32
The data format of the user program (% or
mm) does not match the setting of DIP
switch A-6.
After changing the setting of DIP switch A-6, clear
all memory settings. (Refer to “10-15. Clearing all
memory settings”.)
E-40
Length of a stitch exceeds 10 mm.
Press the RESET switch, and then set the
enlargement ratio again.
E-41
Abnormality in the sewing data.
If programming a new sewing data, repeat the
procedure from the beginning.
E-42
Invalid program number specified.
Press the RESET switch and specify a correct
number.
E-50
Needle bar does not stop when the needle
is raised.
Turn the pulley to align the index mark with the
needle up stop position. (Refer to “10-11. Adjusting
the needle up stop position”.) Check the V-belt
tension. (Refer to “3-14. Installing the V-belt”.)
E-60
E-61
E-62
E-63
Presser has not been lowered.
Presser cannot be raised.
Presser is not raised.
Presser cannot be lowered.
Refer to “16. Troubleshooting”.
Turn off the power and check the connection of
presser sensor connector P1.
E-70
Cooling fan does not operate.
Turn off the power, and then check if the cooling
fan is blocked with scraps of thread.
E-80
Motor PROM is not correctly inserted.
Turn off the power and check.
E-81
Foot switch was depressed when the
power was turned on.
Turn off the power and check.
E-82
An operation panel switch was depressed
when the power was turned on.
Turn off the power and check the operation panel.
Check that all panel cords are normal.
E-90
Abnormal drop in power supply voltage,
or power was turned on again
immediately after it was turned off.
Turn off the power and check the input voltage.
After turning off the power, wait 3 seconds or more
before turning it on again. (Refer to “10-14.
Checking the input voltage”.)
E-91
Abnormal rise in power supply voltage.
Turn off the power and check the input voltage.
(Refer to “10-14. Checking the input voltage”.)
49
LK3-B438E Mark II
14. TABLE OF ERROR CODES
Code
Cause
E-A0
Home position cannot be detected
(malfunction of home position sensor), or
malfunction of power supply circuit board.
Turn off the power and check the connection of
home position sensor connector P1.
E-b0
You tried to change the program number
when DIP switch A-8 was set to ON.
Press the RESET switch.
Set DIP switch A-8 to OFF before trying to change
the program number.
E-d0
Heat sink of control circuit board is
abnormally hot.
Turn off the power and clean the air intake port of
the box.
E-E0
Malfunction of EEPROM (malfunction of
main circuit board).
Turn off the power, and turn it back on. If the error
continually occurs, contact a qualified service
technician.
E-E1
Corrupted EEPROM data, or main PROM
version has been upgraded.
Press the RESET switch to reset the error. However,
the data (memory switches, display and user
programs) will be reset to the backup data or
initialized.
E-E2
Corrupted EEPROM control information
data.
Press the RESET switch to reset the error. However,
the data (memory switches, display and user
programs) will all be initialized.
E-F0
Solenoid short-circuit (malfunction of
main circuit board), or power relay is not
operating (malfunction of power supply
circuit board).
Turn off the power and contact a qualified service
technician.
E-F1
Bad connection in cable between power
supply circuit board and main circuit
board.
Turn off the power and check if connectors P16 is
disconnected.
E-F2
Abnormal current detected in power
supply circuit board.
Turn off the power and contact a qualified service
technician.
Remedy
■ Errors generated when optional equipment is connected
Cause
Code
Remedy
E-10
Emergency stop switch was pressed.
Turn the EMERGENCY STOP switch clockwise to
release the lock, and then press the RESET switch
to reset the error.
E-11
Emergency stop switch was pressed
during sewing.
Turn the EMERGENCY STOP switch clockwise to
release the lock, and then press the RESET switch
to reset the error. You can then press the STEP
BACK switch to repeat the sewing.
E-12
Emergency stop switch is being
continually pressed, or emergency switch
connection error.
Turn off the power and check.
Thread breakage detected.
Turn the EMERGENCY STOP switch clockwise to
release the lock, and then press the RESET switch
to reset the error. You can then press the STEP
BACK switch to repeat the sewing.
E-14
REFERENCE
segment LED alphabet
Panel display
Text display
A
b
c
d
LK3-B438E Mark II
E
F
6
H
L
o
50
15. GAUGE PARTS LIST
15. GAUGE PARTS LIST
• Feed plate
S49951-001
S49952-001
S49954-001
1
4.8
1
1
7
11
4.8
7
4.8
11
7
8.4
4.8
1.6
φ12.5
S49953-001
7
1.5
S49950-001(Standard)
• Button clamp spacer
AR
S52075-001
BR
S52076-001(Standard)
CR
S52077-001
DR
S52078-001
AL
S52071-001
BL
S52072-001(Standard)
CL
S52073-001
DL
S52074-001
2.5
2
1.5
3
• Needle hole plate
HS
S40917-001
HT
φ3.6
S40925-001
φ2
φ3.2
HX
φ3.2
0.8
φ1.6
51
φ2
S52082-001(Standard)
1.2
φ1.6
LK3-B438E Mark II
HV
S52080-001
φ3.2
1.2
0.8
φ2
S52081-001
S52079-001
φ3.6
φ3.6
1.5
HW
HU
1.5
φ1.6
16. TROUBLESHOOTING
16. TROUBLESHOOTING
Problem
Cause
Check
Remedy
Page
Button clamp lifter
amount is too great.
Distance between
button clamp and top
of needle plate
Adjust the height of
the button clamp to
within 17 mm.
34
Presser is contacting
thread wiper.
Thread wiper standby
position
Adjust the position of
the thread wiper.
36
Button clamp does
not drop.
Presser lifter link is
not moving back.
Link return spring is
unhooked.
Hook the link return
spring properly.
Button clamp lift
amount is incorrect.
Incorrect position of
button clamp holder
hook assembly
Distance between
button clamp and top
of needle plate
Adjust the button
clamp lift amount.
34
The thread wiper is
obstructing the
needle.
Clearance beween
thread wiper and
needle tip
Adjust the height of
the thread wiper.
36
Thread wiper
position is incorrect.
Thread wiper
position
Adjust the operating
distance of the thread
wiper.
36
Lower thread winds
to one side.
Bobbin winder thread
tension stud height is
incorrect.
Bobbin winder thread
tension stud height
Adjust the height of
the thread tension
stud.
22
Lower thread
winding amount is
incorrect.
Bobbin presser
position is incorrect.
Thread winding
amount
Adjust the position of
the bobbin presser.
22
Stitches being
skipped at the sewing
start.
Refer to "Skipped
stitches occur"
Refer to "Skipped
stitches occer".
Uneven upper thread
length.
Upper thread length
Adjust the subtension.
23
Upper thread is too
short.
Thread take-up lever
stroke
Adjust the thread
take-up lever stroke.
32
Button clamp does
not rise.
Thread wiper does
not operate correctly.
Threads comes
unthreaded.
LK3-B438E Mark II
52
16. TROUBLESHOOTING
Problem
Upper thread breaks.
Lower thread breaks.
Skipped stitches
occur.
Cause
Check
Upper thread tension
is too strong.
Upper thread tension
Adjust the upper
thread tension.
23
Needle is installed
incorrectly.
Needle direction
Install the needle so
that the groove is
facing forward.
21
Thread is too thick for
the needle.
Thread and needle
Use the correct
thread for the needle.
21
Thread take-up
spring tension and
height are incorrect.
Thread take-up
spring tension and
height
Adjust the tension
and height of the
thread take-up spring.
24
Damaged or burred
rotary hook, needle
hole plate or needle.
Damage or burring
File smooth or
replace the afffected
part.
Thread melting
(synthetic thread)
Thread edge
Use a thread cooling
device (optional).
55
Lower thread tension
is too strong.
Lower thread tension
Adjust the lower
thread tension.
23
Corners of needle
hole plate or bobbin
care are damaged.
Damage
File smooth or
replace the affected
part.
Clearance between
needle and rotary
hook tip is too great.
Needle clearance
Adjust the needle
clearance.
31
Incorrect needle and
rotary hook timing.
Needle bar lift
amount
Adjust the needle bar
lift amount.
30
Driver is contacting
needle more than is
necessary.
Clearance between
driver and needle
Adjust the driver
needle guard.
31
Needle is bent.
Bent needle
Replace the needle.
Needle is installed
incorrectly.
Needle direction
Install the needle so
that the groove is
facing forward.
21
Needle is striking the
button.
Needle down setting
Refer to “6
CHECKING THE
SEWING PATTERN”.
20
Needle clearance
Adjust the needle
clearance.
31
Needle bar lift
amount.
Adjust the needle bar
lift amount.
30
Needle is bent.
Bent needle
Replace the needle.
Needle is too thin.
Needle and thread
Use the correct
needle for the
material.
Needle is touching
the rotary hook.
Needle breaks.
53
LK3-B438E Mark II
Remedy
Page
16. TROUBLESHOOTING
Problem
Cause
Check
Sharpen or replace
the fixed knife.
Shuttle race thread
guide position
Adjust the position of
the shuttle race
thread guide.
31
Needle bar lift
amount
Adjust the needle bar
lift amount.
30
The movable knife does not pick
up the thread because of skipped
stitches at the sewing end.
Skipped stitches at
sewing end
Refer to “Skipped
stitches occur”.
Movable knife
position is incorrect.
Movable knife
position
Adjust the position of
the movable knife.
32
Sub-tension is too
weak.
Sub-tension
Turn the sub-tension
nut to adjust the
tension.
23
Thread take-up
spring tension and
height are incorrect.
Thread take-up
spring tension and
height
Adjust the tension
and height of the
thread take-up spring.
24
Incorrect needle and
rotary hook timing.
Needle bar lift
amount
Adjust the needle bar
lift amount.
30
Shuttle race thread
guide is not separating
the threads.
Shuttle race thread
guide position
Adjust the position of
the shuttle race
thread guide.
31
Shuttle race thread
guide is not separating
the threads.
Shuttle race thread
guide position
Adjust the position of
the shuttle race
thread guide.
31
Upper thread is not
properly tight.
Upper thread tension.
Adjust the upper
thread tension.
23
Uneven upper thread
length.
Upper thread length
Adjust the subtension.
23
Upper thread is too
long.
Thread take-up lever
stroke
Adjust the thread
take-up lever stroke.
32
Needle is striking the
button.
Needle down setting
Refer to “6
CHECKING THE
SEWING PATTERN”.
20
Upper thread tension
is too weak.
Upper thread tension
Adjust the upper
thread tension.
23
Lower thread tension
is too weak.
Lower thread tension
Adjust the lower
thread tension.
23
Thread take-up
spring tension and
height are incorrect.
Thread take-up
spring tension and
height
Adjust the tension
and height of the
thread take-up spring.
24
Needle is striking the
button.
Needle down setting
Refer to “6
CHECKING THE
SEWING PATTERN”.
20
Movable knife does
not pick up the
thread.
Thread jamming.
Poor seam finish on
reverse side of
material.
Incorrect thread
tightness.
Button breaks.
Page
Fixed knife blade
Fixed knife is blunt.
Upper thread is not
trimmed.
Remedy
LK3-B438E Mark II
54
17. OPTIONAL PARTS
17. OPTIONAL PARTS
■ Two-pedal foot switch ....................................... The presser switch and the start switch have been separated,
giving the operator more flexibility to select the best method
of working.
■ Two-step foot switch ......................................... This is a pedal-type foot switch.
■ Liquid cooling tank . .......................................... This helps to prevent thread breakages caused by friction
when using synthetic threads.
Fill the tank with silicone oil (100 mm2/s).
■ Solenoid thread wiper ....................................... This wipes the thread independently of the work clamp operation.
55
LK3-B438E Mark II
INSTRUCTION MANUAL
BROTHER INDUSTRIES,LTD.
Printed in Japan
NAGOYA,JAPAN
118-V38
S91V38-002
2000.02. B (1)