Brother LK3-B434E User manual

INSTRUCTION MANUAL
Please read this manual before using the machine.
Please keep this manual within easy reach for quick reference.
ELECTRONIC LOCKSTITCH PATTERN TACKER
LK3-B434E

i
LK3-B434E Mark II
Thank you very much for buying a BROTHER sewing machine. Before using your new machine, please read the safety instruc-
tions 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
The instructions which follow this term indicate situations where failure to follow the instruc-
tions could cause injury when using the machine or physical damage to equipment and sur-
roundings.
Symbols
................ This symbol ( ) indicates something that you should be careful of. The picture inside the triangle indi-
cates 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”.)
CAUTION
The instructions which follow this term indicate situations where failure to follow the instructions
will almost certainly result in death or severe injury.
DANGER

ii LK3-B434E Mark II
Use the sewing machine in an area which is free from
sources of strong electrical noise such as high-
frequency welders.
Sources of strong electrical noise may cause prob-
lems 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 prob-
lems with correct operation.
The pneumatic delivery capability should be greater
than the requirements for the sewing machine’s total
air consumption.
Insufficient pneumatic delivery capability may cause
problems with correct operation.
CAUTION
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 for-
mation 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.
Environmental requirements
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 49 kg. The
installation should be carried out by two or more people.
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.
Hold the machine head with both hands when tilting it
back or returning it to its original position.
Furthmore, 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.
Be sure to connect the ground. If the ground connec-
tion is not secure, you run a high risk of receiving a
serious electric shock, and problems with correct
operation may also occur.
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.
Install the belt covers to the machine head and motor.
If using a work table which has casters, the casters
should be secured in such a way so that they cannot
move.
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 in-
flammation can result.
Furthermore, do not drink the oil or eat the grease un-
der any circumstances, as they can cause vomiting
and diarrhoea.
Keep the oil out of the reach of children.
Installation
2. Notes on safety
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.
DANGER

iii
LK3-B434E Mark II
CAUTION
Set the needle to the needle up stop position before
turning off 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 in-
flammation can result.
Furthermore, do not drink the oil or eat the grease un-
der any circumstances, as they can cause vomiting
and diarrhoea.
Keep the oil out of the reach of children.
This sewing machine should only be used by opera-
tors who have received the necessary training in safe
use beforehand.
The sewing machine should not be used for any
applications other than sewing.
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 off 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
If using a work table which has casters, the casters
should be secured in such a way so that they cannot
move.
Attach all safety devices before using the sewing
machine. If the machine is used without these devices
attached, injury may result.
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.
Sewing
Cleaning
If the power switch and air need to be left on when
carrying out some adjustment, be extremely careful to
observe all safety precautions.
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 abso-
lutely 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.
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 step position before
turning off 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 ro-
tary hook
Disconnect the air hoses from the air supply and wait
for the needle on the pressure gauge to drop to “0”
before carrying out inspection, adjustment and repair
of any parts which use the pneumatic equipment.
Maintenance and inspection

iv LK3-B434E Mark II
Safety devices
Eye guard
Finger guard
Thread take-up cover
Thread take-up solenoid cover
Belt cover
Motor cover, etc.
2
Moving parts
may cause injury.
Operate with safety devices.
Turn off main switch before
threading, changing bobbin
and needle, cleaning etc.
3Be 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.
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.
3. Warning labels
1
Hazardous voltage
will cause injury.
Turn off main
switch and wait 5
minutes before
opening this cover.
Un voltage non adapté
provoque des blessures.
Eteindrel'interrupteur et
attendre 5 minutes
avantd' ouvrir le capot
Hochspannung
verletzungsgefahr!
Bitte schalten sie den
hauptschalter aus und
warten sie 5 minuten,
bevor sie diese
abdeckung öffnen.
Un voltaje inadecuado
puede provocar las
heridas.
Apagar el interruptor
principal y esperar 5
minutos antes de abrir
esta cubierta.
4Direction of operation
Thread take-up
solenoid cover
Finger guard
2
Motor cover
Thread take-up
cover
4
Belt cover
Eye guard 1
3

LK3-B434E Mark II
CONTENTS
1. NAME OF EACH PART ............................... 01
2. SPECIFICATIONS ......................................... 02
2-1. Specifications ....................................... 2
2-2. Examples of sewing patterns ............. 3
3. INSTALLATION ............................................. 04
3-1. Power table ........................................... 4
3-2. Installing the motor ............................. 5
3-3. Installing the motor pulley .................. 5
3-4. Installing the control box .................... 6
3-5. Installing the rubber cushions ............ 7
3-6. Installing the oil pan ............................ 7
3-7. Installing the cushions......................... 7
3-8. Installing the machine head ............... 8
3-9. Installing the head rest ........................ 8
3-10. Installing the liquid cooling tank,
optional ................................................. 8
3-11. Installing the operation panel ............. 9
3-12. Connecting the ground wire ............... 9
3-13. Connecting the cords........................... 10
3-14. Piping (for pneumatic) ......................... 12
3-15. Installing the V-belt .............................. 14
3-16. Installing the belt cover ....................... 15
3-17. Installing the foot switch ..................... 15
3-18. Installing the motor cover ................... 16
3-19. Installing the spool stand .................... 16
3-20. Installing the needle sub plate ........... 17
3-21. Installing the eye guard ...................... 18
4. LUBRICATION ............................................... 19
4-1. Lubrication points ................................ 19
5. OPERATION .................................................. 20
5-1. Name and function of each
operation panel item ........................... 20
5-2. Operating procedure............................ 22
5-3. Operating the foot switch ................... 23
5-4.
Operating the emergency stop switch ... 24
6. CHECKING THE SEWING PATTERN ....... 25
7. CORRECT USE ......................................... 26
7-1. Selecting the needle and thread ........ 26
7-2. Installing the needle ............................ 26
7-3. Threading the upper thread ................ 26
7-4. Winding the lower thread ................... 27
7-5. Replacing the bobbin case and
threading the thread ............................ 28
7-6. Sewing conditions and thread
tension................................................... 28
8. SEWING ................................................... 31
9. MAINTENANCE AND INSPECTION ....... 32
9-1. Cleaning the rotary hook .................... 32
9-2. Lubrication ............................................ 33
9-3. Draining the oil..................................... 34
9-4. Cleaning the control box air inlet
port ........................................................ 34
9-5. Cleaning the eye guard ....................... 34
9-6. Checking the needle ............................ 34
10.STANDARD ADJUSTMENTS ................. 35
10-1. Adjusting the needle bar height......... 35
10-2.
Adjusting the needle bar lift amount ..... 35
10-3. Adjusting the driver needle guard ..... 36
10-4. Adjusting the needle clearance .......... 36
10-5. Adjusting the shuttle race thread
guide...................................................... 36
10-6.
Adjusting the thread take-up amount .... 37
10-7. Adjusting the movable knife ............... 37
10-8. Adjusting the work clamp lift amount ... 40
10-9. Work clamp interchangeability ........... 41
10-10.
Adjusting the needle up stop position ... 41
10-11.Adjusting the thread wiper ................. 42
10-12.Checking the input sensor and
DIP switch input ................................... 43
10-13.Checking the input voltage ................. 44
10-14.Clearing all memory settings ............. 44
10-15.Moving stitch patterns......................... 45
10-16.Adjustment of air pressure
(for pneumatic) ..................................... 46
10-17.
Adjustment of inner clamping device .... 46
11.USING THE COUNTERS ......................... 47
11-1. Using the bobbin thread counter ....... 47
11-2. Using the production counter ............ 47
12.CHANGING FUNCTIONS USING
THE DIP SWITCHES ................................ 48
12-1. Operation panel DIP switches ............ 48
12-2. DIP switches inside the control
box ......................................................... 49
12-3. Using user programs ........................... 50
13.CHANGING SPECIAL FUNCTIONS
USING THE MEMORY SWITCHES ........ 52
13-1. Using the cycle sewing function ........ 55
14.SETTING THE WORK CLAMP MODE .... 57
14-1. Setting solenoid work clamp mode ... 57
14-2.
Setting pneumatic work clamp mode .... 57
14-3. Light work clamp ................................. 58
14-4. Setting reverse work clamp mode ..... 59
15.TABLE OF ERROR CODES ...................... 60
16.GAUGE PARTS LIST ACCORDING
TO SUBCLASSES .................................... 62
17.TROUBLESHOOTING ................................. 65
18.OPTIONAL PARTS ....................................... 68

1LK3-B434E Mark II
1. NAME OF EACH PART
1. NAME OF EACH PART
Safety devices;
qPower switch !2 Finger guard
wControl box !3 Eye guard
eOperation panel !4 Thread take-up cover
rFoot switch !5 Belt cover
tMotor !6 Motor cover
yTension release lever !7 Thread take-up solenoid cover
uEMERGENCY STOP switch
iPulley
oSpool stand
!0 Thread take-up lever
!1 Wiper solenoid cover
[LK3-B434E Mark II/Pneumatic specifications]
[LK3-B434E Mark II/Solenoid specifications]
r
y
t
e
w
q
o
i
!5
!0
!6
!4
u
!2
!3
!7
Specifications with inner clamping device
!7
u
r
y
t
q
!6
w
!5
e
o
!0
!2
i
!4
!3
!1

2
LK3-B434E Mark II
2. SPECIFICATIONS
2-1. Specifications
2. SPECIFICATIONS
Maximum sewing speed
Maximum pattern size
Feed mechanism
Stitch length
Number of stitches
Maximum stitch number
Work clamp lifter
Work clamp height
Rotary hook
Wiper device
Thread trimmer device
Data storage method P-ROM (Any sewing pattern can be added using BAS-PC/300.)
Safety device
Number of user
programs
Number of stored
data
Motor
Weights
Power source
Single needle lock stitch
2,500 rpm (Pitch 3 mm)
100 ×60 mm max.
R-θintermittent feed mechanism (pulse-motor driven mechanism)
0.1 - 10.0 mm
Variable
20,000 stitches (including 10,000 stitches which can be added)
Solenoid type or pneumatic type
17 mm max. (for solenoid), 25 mm max. (for pneumatic)
(Max. 17 mm for inner clamping device)
Shuttle hook (shuttle hook 2, optional)
Standard equipment
Standard equipment
built-in stopping mechanism
16
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: 49 kg, Operation panel: 0.6 kg,
Control box: 9 - 19 kg (depending on destination)
Single-phase 220 - 230V
3-phase 220, 380, 400, 415V
Maximum electric power consumption; 600VA
Stitch formation
Number of cycle
programs 4
Standard equipment
Thread take-up device
[Main use]
Patterns up to a maximum size of 100 mm ×60 mm can be sewn.
For plain stitching of small articles, curtain darts, etc.
Two-stage work clamp, light work clamp and inner clamping device can be used (for pneumatic).
For attaching items, sewing labels, etc.
If you want to sew a pattern, you can create your original pattern using the BAS-PC/300.
Consult with your local Brother Sales Office for details.
BROTHER INDUSTRIES, LTD.
MADE IN JAPAN
LK3-B434EX-3 Heavy materials2Medium materials1

3LK3-B434E Mark II
2-2. Examples of sewing patterns
The following are examples of possible patterns with the LK3-B434E Mark II.
2. SPECIFICATIONS
Uses
Number of stitches
Sewing
patterns
Uses
Number of stitches
Sewing
patterns
Uses
Number of stitches
Sewing
patterns
Uses
Number of stitches
Decorative tacking
42
Cross tacking
56
Square tacking
63
Heart-shaped tacking
70
Triangular chain tacking
98
Open cross tacking
42
Bullet-nose tacking
42
Half-moon tacking
64
Rectangular decorative tacking
28
Buckle stitching
56
Round tacking
63
L-shaped tacking
28
Sewing
patterns

4
LK3-B434E Mark II
3. INSTALLATION
3. 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 head weighs more than
49 kg. The installation should be carried out
by two or more people.
Do not connect the power cord until installa-
tion is complete, otherwise the machine may
operate if the foot switch is depressed by mis-
take, which could result in injury.
Hold the machine head with both hands when
tilting it back or returning it to its original posi-
tion. Furthermore, after tilting back the ma-
chine 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.
All cords should be secured at least 25 mm
away from any moving parts. Furthermore,
do not excessively bend the cable or se-
cure it too firmly staples, otherwise there is
the danger that fire or electric shocks could
occur.
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.
Install the belt covers to the machine head
and motor.
CAUTION
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.
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.
Table/ legs assembly
Model code
127-V30-00001
Control Box
depth 5
Counterbore depth 23
Section A-A
Operation
panel cord
hole
Motor

5LK3-B434E Mark II
q
w
e
r
y
u
q
e
Table
1 mm
t
3-2. Installing the motor
Install the motor uto the work table with the four ac-
cessory bolts q, cushions w, cushion collars e, flat
washers r, spring washers tand nuts y.
At that time, fix by setting bolts qa little to the right
of oval hole on motor.
NOTE:
Tighten the nuts yso that the clearance between the table
and the cushion collars eis approximately 1 mm.
3-3. Installing the motor pulley
Place the motor pulley qonto the shaft of the motor
wso that the key groove is aligned, and then tighten
the set screw eso that the center of the V groove in
the motor pulley qis aligned as closely as possible
with the center of the belt hole in the power table.
3. INSTALLATION
q
w
e

6
LK3-B434E Mark II
3. INSTALLATION
!0
!1
!2
w
eq
o
i
u
y
t
r
t
u
i
o
y
Table
Cushions
Cushion collars
Nuts
Flat washers
Rubber collers
3 mm
!3
3-4. Installing the control box
1. Remove the 12 screws q, and then open the covers (panel mounting assembly wand 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 iand nuts oas 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 oat each installation location, and make sure that both nuts are tightened.
3. Close the covers (panel mounting assembly wand main P.C. board mounting plate e), and tighten them
with the screws q.
* The main P.C. board mounting plate ewill 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.

7LK3-B434E Mark II
3-5. Installing the rubber cushions
3-6. Installing the oil pan
3-7. Installing the cushions
Install the rubber cushions qwith the nails w.
1. Insert the tabs of the oil pan winto the holes for
the cushions q, and then secure it in place with
the five nails eso that the oil pan wis not at an
angle.
2. While pushing the oil pan wdown from above,
screw in the oil container r.
Place the two cushions qinto 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.
3. INSTALLATION
w
w
e
q
r
w
q
q

8
LK3-B434E Mark II
y
u
q
wq
3-8. Installing the machine head
1. Insert the head hinges qinto 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 eand cushions r.
NOTE:
Pull the cords tout as shown in the illustration above in order to prevent them from being clamped by the machine
head.
3. Install the hinge presser ywith the two screws u.
3-9. Installing the head rest
Tap the head rest qinto the table hole.
NOTE:
Tap the head rest securely into the table hole.
3-10. Installing the liquid cooling tank, optional
1. Remove the rubber plug, and then push the liquid
cooling tank q.
2. Tighten it with the set screw w.
3. INSTALLATION
w
e
q
r
t
66
13
17

9LK3-B434E Mark II
Be sure to connect the ground. If the ground connection is not secure, you run the risk of receiv-
ing a serious electric shock, and problems with correct operation may also occur.
t
e
w
r
w
r
q
e
t
q
CAUTION
Table
Table
Red
White
Black
Yellow/Green
3-11. Installing the operation panel
1. Install the rear frame qto the work table (top or bottom) with the four wood screws w.
2. Install the front frame eto the rear frame qwith the four screws r.
* The vertical orientation of the front frame eis the same whether it is installed to the top or the bottom of
the work table.
3. Insert the connector cord tinto 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 twith the staples (in three places).
3-12. Connecting the ground wire
Connect to the power switch. However, the
black wire is insulated to the inside of the box
and is not used.
3. INSTALLATION
The operation panel can be installed to either the top or bottom of the work table.
Top of work table Bottom of work table
Connect to ground

10
LK3-B434E Mark II
Connection location
X, Y, Sewing sensor
Synchronizer
Machine specification
select connector
Thread wiper solenoid*
Thread take-up solenoid
Presser solenoid
Thread trimmer solenoid
Pulse motor, Y
Pulse motor, X
Operation panel
Upper shaft motor
No. of pins
12-pin
5-pin
8-pin
5-pin
4-pin
4-pin (blue)
4-pin
26-pin
3-pin
Cord mark
z
x
c
v
b
n
m
None
None
Connection location on circuit board
P1 (ORG2)
P2 (SYNCHRO)
P3 (SELECT)
P4 (SOL2)
P5 (SOL)
P6 (YPM)
P7 (XPM)
P8 (PANEL)
P11 (UVW)
Machine head connectors
EMERGENCY STOP switch
Solenoid valve (for pneumatic)
6-pin
12-pin
⁄8
None
P18 (HEAD)
P14 (AIR)
w
q
!1
!0 r
P11 P7
P6
P5
P4
e
P3
P2
P1
P8
!3
!2
q
o
u
i
y
t
* Provided as an option for solenoid specifications.
3-13. Connecting the cords
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 qthrough the hole win 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 yin the direction of the white arrow and
pass the cords qthrough the opening.
6. Loosen the screw o, and then attach the ground cord ufor the machine head and the ground cord ifor
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 illustra-
tion.
8. Securely connect connectors P1 to P8, P11, P14 (for pneumatic) and P18 as indicated in the table.
3. INSTALLATION
9. Secure the cords qwith the cord clamps !2 and !3.
10. Close the cord presser plate yin 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.
P18
P14

11 LK3-B434E Mark II
3. INSTALLATION
11. Replace PROM control assembly with one which contains sewing data.
1) Use the special tool to remove the PROM control assembly !4 from the PROM socket !5.
* Store the removed PROM control assembly in the special case provided.
2) Bend the pins of the PROM control assembly which contains sewing data !6 so that they are at an angle
of approximately 90˚.
3) Make the directions of the PROM control assembly !6 and the PROM socket !5 same so that the portions
(a) come on the same side, and press the PROM gently into the socket while checking that the pins of the
PROM are going into the socket properly.
NOTE:
•If the PROM has been replaced, press the RESET switch !7 while turning on the power in order to initialize the
memory.
All of the user programs, cycle programs and memory switches which have been recorded will then be cleared.
•The PROM which is installed at the time of shipment from the factory does not include any sewing data. If you try
to change the program number without replacing the PROM, error “E-b1”will be displayed.
To create sewing data, use the BAS-PC/300 electronic pattern sewer/reader (sold separately).
12. Tighten the cover (main P.C. board mounting plate r) with the six screws e.
RESET
re
!4
!5
!5
!4 !6
!5
!7
90˚90˚
a
a

12
LK3-B434E Mark II
3. INSTALLATION
3-14. Piping (for pneumatic)
Connect air tubes in accordance with the identified numbers in the figure. At this time, pass the air tubes
through the hole qand then pass it through the work table hole.
* After connecting the air tubes, bind them together with the fastening band.
* Light work clamp mode can be used by changing over the air tube connections.
(Refer to “14. Setting the work clamp mode”.)
Cylinder R
Cylinder L
Reversal
cylinder
Upper knob
Lower knob
Switch
Pneumatic work clamp
Reverse work clamp
1B
2B 1A
3A 3B
2A
1B
2B
1
2
1A
2A
1
2
3
3B
1B
2B
3A 2A
1A
q

13 LK3-B434E Mark II
3. INSTALLATION
3-14-1. Installing the air unit
Make sure that the air unit does not touch the control box or the work table leg.
■ When installing to the underside of the work table
1. Remove the two screws qand the valve setting plate w.
2. Turn the valve setting plate wupside down, and install it to the underside of the work table using the two
wood screws eand washers rwhich are provided as accessories.
3. Install the air unit tto the valve setting plate wwith two screws q.
4. Connect the air hose y.
5. Adjust the air pressure. (Refer to “10-16. Adjusting the air pressure”.)
■ When installing to a beam
1. Make holes in the beam as shown in the illustration above. (Button hole diameter is 5.4 mm.)
Pneumatic work clamp ...... Pitch 50 mm Reverse work clamp ...... Pitch 120 mm
2. Install the air unit uto the beam with two accessory screws iand two bolts o.
3. Connect the air hose !0.
4. Adjust the air pressure. (Refer to “10-16. Adjusting the air pressure”.)
3-14-2. Adjusting the speed controller
The speeds at which the work clamps are raised and lowered can be adjusted by loosening or tightening the
valve control knobs. The speeds should be adjusted to speeds which are suitable for the intended application.
•If the upper control knob is tightened, the raising speed becomes slower; if it is loosened, the raising speed
becomes faster.
•If the lower control knob is tightened, the lowering speed becomes slower; if it is loosened, the lowering
speed becomes faster.
•When the power is turned off, the work clamps can be operated by pressing the switch.
NOTE:
Pneumatic specifications
Adjust the control knobs so that the left and right work clamps both operate at the same speed.
Specifications with inner clamping device
First, adjust the speed for the reverse work clamp. (Valve 1)
Next, turn on the power and then adjust the speed of the left work clamp. (Valve 2)
Adjust the control knobs so that the lowering speed of the left work clamp becomes faster than that of the reverse
work clamp and the raising speed of it becomes slower than that of the reverse work clamp.
Next, adjust the control knobs so that the reverse work clamp operates more quickly. (Valve 3)
q
q
t
w
wr
e
y
u
o
!0
i
50 mm
120 mm

14
LK3-B434E Mark II
rApprox. 9 - 10 mm
10N
V-belt
Motor
A
B
3-15. Installing the V-belt
Approx.
1 mm
Sewing
machine
1. Gently tilt back the machine head, and then place
the V-belt qinto the V grooves on the machine
head pulley wand the motor pulley e.
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 po-
sition.
* Be careful not to clamp the cords at this time.
3. Provisionally install the accessory tension pulley
assembly rwith the accessory flat washer, spring
washer and bolt.
4. Adjust the belt tension by moving the tension pul-
ley assembly to the right and left so that there is
9 - 10 mm of deflection in the V-belt qwhen it is
gently pushed in the middle with a force of ap-
proximately 10 N. After adjusting, tighten the bolt
Ato 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 Bto secure the right
pulley assembly.
NOTE:
Use brother specified V-belt (belt, VM).
The V-belt qmay 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 V-
belt is straight. (Fig.1)
3. INSTALLATION
w
q
e
Fig.1