JUKI LK-1903A-305, LK-1903A, LK-1902A, LK-1901A, LK-1900A Instruction Manual

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LK-1900A

LK-1901A LK-1902A LK-1903A LK-1903A-305

INSTRUCTION MANUAL

蠢 . EXPLANATION OF LK-1900A, COMPUTER-CONTROLLED

HIGH-SPEED BARTACKING MACHINE .................................................................... 1

[1] SPECIFICATIONS ..................................................................................................................................1

[2] CONFIGURATION ..................................................................................................................................2

1. Names of main unit .......................................................................................................................................... 2

2. Names and explanation of switches on the operation panel ....................................................................... 3

[3] INSTALLATION ...................................................................................................................................... 4

1. Installing the electrical box ............................................................................................................................. 4

2. Attaching the connecting rod ......................................................................................................................... 4

3. Installing the head support rod ...................................................................................................................... 4

4. Installing and connecting the power switch.................................................................................................. 5

5. Installation of the sewing machine head ....................................................................................................... 6

6. Installing the drain receiver and the head support rubber .......................................................................... 6

7. Safety switch .................................................................................................................................................... 7

8. Tilting the sewing machine head .................................................................................................................... 7

9. Installing the operation panel ......................................................................................................................... 8

10. Connecting the cord ........................................................................................................................................ 9

11. Installing the motor cover ............................................................................................................................. 10

12. Managing the cord ......................................................................................................................................... 11

13. Installing the eye protection cover ............................................................................................................... 11

14. Installing the thread stand ............................................................................................................................ 12

[4] OPERATION OF THE SEWING MACHINE ..........................................................................................13

1. Lubrication ..................................................................................................................................................... 13

2. Attaching the needle ...................................................................................................................................... 13

3. Threading the machine head ........................................................................................................................ 14

4. Installing and removing the bobbin case .................................................................................................... 14

5. Installing the bobbin ...................................................................................................................................... 15

6. Adjusting the thread tension ........................................................................................................................ 15

7. Adjusting the thread take-up spring ............................................................................................................ 16

8. Example of the thread tension ...................................................................................................................... 16

[5] OPERATION OF THE SEWING MACHINE (BASIC) ...........................................................................17

1. Item data setting ............................................................................................................................................ 17

2. Checking the contour of a sewing pattern .................................................................................................. 19

3. Sewing ............................................................................................................................................................ 20

4. Change to the other sewing pattern ............................................................................................................. 20

5. Winding a bobbin ........................................................................................................................................... 21

6. Thread clamp device ..................................................................................................................................... 22

[6] OPERATION OF THE SEWING MACHINE (ADVANCED) .................................................................. 24

1. Performing sewing using the pattern keys ( , , , and ) ............................................. 24

2. Performing sewing using the combination function .................................................................................. 27

3. Performing sewing using the “bobbin thread counter” ............................................................................. 29

4. How to use the temporary stop .................................................................................................................... 29

5. Setting the pattern thread tension ............................................................................................................... 30

6. Cautions in operation .................................................................................................................................... 31

[7] MAINTENANCE ................................................................................................................................... 31

1. Adjusting the height of the needle bar ........................................................................................................ 31

2. Adjusting the needle-to-shuttle relation ...................................................................................................... 32

3. Adjusting the lift of the work clamp foot ..................................................................................................... 33

4. The moving knife and counter knife............................................................................................................. 33

5. Needle thread clamp device .......................................................................................................................... 34

6. Adjustment of the wiper ................................................................................................................................ 34

7. Draining waste oil .......................................................................................................................................... 35

8. Amount of oil supplied to the hook .............................................................................................................. 35

9. Replacing the fuse ......................................................................................................................................... 35

10. Changing the voltage of 100/200V ................................................................................................................ 36

11. Replenishing the designated places with grease ....................................................................................... 37

[8] HOW TO USE THE MEMORY SWITCH ............................................................................................... 38

1. Start and change of the memory switch ...................................................................................................... 38

2. Example of the memory switch setting ....................................................................................................... 38

3. Table of functions of the memory switch .................................................................................................... 42

[9] OTHERS ............................................................................................................................................... 45

1. Setting the DIP switch ................................................................................................................................... 45

2. Table of the standard pattern specifications ............................................................................................... 46

3. Table of the standard patterns ...................................................................................................................... 47

4. Table of the work clamp foot ......................................................................................................................... 49

5. LK-1900 data ROM ......................................................................................................................................... 51

6. Connection of the optional pedal ................................................................................................................. 51

7. Error list .......................................................................................................................................................... 52

8. Troubles and corrective measures (sewing conditions) ............................................................................ 55

9. Table of the optional parts ............................................................................................................................ 57

2. EXPLANATION OF THE LK-1901A, COMPUTER-CONTROLLED HIGH-SPEED

EYELET BUTTONHOLE BARTACKING MACHINE ................................................. 59

1. Specifications ................................................................................................................................................. 59

2. Installation of the sewing machine and preparation of the operation ...................................................... 59

3. Adjustment of the material closing amount ................................................................................................ 60

4. Adjustment of the lift of the work clamp foot .............................................................................................. 60

5. Adjustment of the pressure of the work clamp unit ................................................................................... 61

6. Setting of the material closing operation .................................................................................................... 61

7. Selection and confirmation of the sewing patterns .................................................................................... 62

3. EXPLANATION OF THE LK-1902A, COMPUTER-CONTROLLED HIGH-SPEED

BELT-LOOP ATTACHING MACHINE........................................................................ 63

1. Specifications ................................................................................................................................................. 63

2. Installation of the sewing machine and preparation of the operation ...................................................... 63

3. Threading the machine .................................................................................................................................. 63

4. Selection and confirmation of the sewing patterns .................................................................................... 64

5. Combination of the work clamp foot and the feed plate ............................................................................ 64

4. EXPLANATION OF THE LK-1903A, COMPUTER-CONTROLLED

HIGH-SPEED LOCKSTITCH BUTTON SEWING MACHINE ...................................65

1. Specifications ................................................................................................................................................. 65

2. Installation of the sewing machine and preparation of the operation ...................................................... 65

3. Needle and thread .......................................................................................................................................... 65

4. Various sewing modes .................................................................................................................................. 66

5. Position of the button clamp jaw lever ......................................................................................................... 67

6. Adjusting the feed plate ................................................................................................................................ 68

7. Adjusting the button clamp jaw lever .......................................................................................................... 68

8. Adjusting the lifting amount of the button clamp ....................................................................................... 69

9. Adjustment of the pressure of the work clamp unit ................................................................................... 69

10. Adjustment of the wiper spring .................................................................................................................... 70

11. Installing the save button bar (accessory part) .......................................................................................... 70

12. Model classification according to the button size ...................................................................................... 71

13. Attaching the shank botton (optional) ......................................................................................................... 72

5. DRAWING OF THE TABLE ...................................................................................... 76

. EXPLANATION OF LK-1900A, COMPUTER-CONTROLLED HIGH-

SPEED BARTACKING MACHINE

[1] SPECIFICATIONS

1) Sewing area .................................................X (lateral) direction 40 mm Y (longitudinal) direction 30

2) Max. sewing speed ...................................... * 3,000 sti/min

(When sewing pitches are less than 5 mm in X-direction

and 3.5 mm in Y -direction.)

3) Stitch length ................................................. 0.1 to 10.0 mm (adjustable in 0.1 mm step)

4) Feed motion of work clamp foot ................... Intermittent feed (2-shaft drive by stepping motor)

5) Needle bar stroke ......................................... 41.2 mm

6) Needle .......................................................... DP x 5, DPx17

7) Lift of work clamp foot ..................................13 mm (standard) Max. 17 mm

8) Shuttle .......................................................... Standard semi-rotary hook (oil wick lubrication)

9) Lubricating oil ............................................... New Defrix Oil No. 2 (supplied by oiler)

10) Data recording .............................................. EE-PROM (128Kbyte) E-PROM (32kbyte)

11) Enlarging / Reducing facility ......................... 20% to 200% (1% step) in X direction and Y direction

respectively

12) Enlarging / Reducing method ....................... Pattern e n l a rgement / re d u c t i o n ca n b e d o n e by

increasing/decreasing the stitch length

13) Max. sewing speed limitation .......................400 to * 3,000 sti/min (100 sti/min steps)

14) Pattern selection .......................................... Specifying pattern No. type (1 to 200)

15) Bobbin thread counter .................................. UP/DOWN type (0 to 9999)

16) Sewing machine motor ................................. Servo motor

17) Dimensions................................................... W : 1,200 mm L : 660 mm H : 1,100 mm

(Use the standard table and stand.)

18) Weight .......................................................... Machine head 42 kg, Control box 16.5 kg

19) Power consumption ...................................... 320 W

20) Operating temperature range ....................... 5 ˚C to 35 ˚C

21) Operating humidity range ............................. 35% to 85% (No dew condensation)

22) Line voltage .................................................. Rated voltage ± 10% 50/60 HZ

23) Noise ............................................................ - Equivalent continuous emission sound pressure level

(LpA) at the workstation :

A-weighted value of 81.0 dB; (Includes KpA = 2.5 dB);

according to ISO 10821- C.6.3 -ISO 11204 GR2 at 2,900

sti/min for the sewing cycle, 1.0s ON (Pattern : No.1).

- Sound power level (LWA) ;

A-weighted value of 90.0 dB; (Includes KWA = 2.5 dB);

according to ISO 10821- C.6.3 -ISO 11204 GR2 at 2,900

sti/min for the sewing cycle, 1.0s ON (Pattern : No.1).

* Reduce the max. sewing speed in accordance with the sewing conditions.

* Max. sewing speed of LK-1900AWS (double capacity hook) is 2,700 sti/min.

－

[2] CONFIGURATION

1. Names of main unit

Machine head

Work clamp feet

Thread stand

Operation panel

Power switch

Control box

Pedal switch

2. Names and explanation of switches on the operation panel

!0!1

“Ready” key

This key changes over the setting state from

the panel to the sewing state where the sewing machine actually operates.

Sewing LED

This LED goes off at the time of setting state and lights up at the time of sewing state. Changeover can be performed with “Ready” key.

“Reset” key

This key is used for canceling error or returning

the set value to the initial value.

“Mode” key

This key makes the setting mode of the memory

switch.

“+/Feed forward” key and “-/Feed backward” key

This key is used for changing pattern No. and

X/Y scale, and feed forward/feed backward.

“Selection” key

This key s e l ects t h e it e m to b e se t . I t e m

selection LED of the selected item and the set value are displayed.

Data indication LED

This LED indicates the set values of the selected

items such as pattern No., X/Y scale, etc.

Item selection LED

LEDs of the selected items light up.

Pattern No.

Max. speed

limitation

Work clamp

foot lowering

Needle thread clamp ON/OFF key

X scale

Sewing

counter

Thread

tension

Y scale

Bobbin

winder

This key selects effective/ineffective of needle

thread clamp. When it is effective, needle thread clamp display LED lights up.

Needle thread clamp display LED

(Note 1)

When this LED lights up, needle thread clamp

operates.

Needle thread clamp display LED

This key registers the pattern. When this key is

pressed, the pattern registered here can sew immediately.

X/Y scale, sewing position, etc. can be changed

and registered.

(Note 1) LK-1903A is set to needle thread clamp prohibited (no motion) with memory switch No. 35 at

the time of standard delivery.

－

[3] INSTALLATION

1. Installing the electrical box

2. Attaching the connecting rod

2 3

Install the electrical box on the underside of the

table at the location illustrated using round-head

bolt 1, plain washer 2, spring washer 3 and nut

supplied with the machine, and using bolt having

hexagonal indentation on the head 5, spring washer

and plain washer 7 supplied with the machine.

1) Fix connecting rod 1 to installing hole B of pedal

lever 2 with nut 3.

when connecting rod 1 is installed in installing hole

, the depressing stroke of the pedal is increased.

3. Installing the head support rod

Drive head support rod 1 in hole 2 in the machine

table.

4. Installing and connecting the power switch

(1) Installing the power switch

Fix power switch 1 under the machine table with

(2) Connecting the power source cord

Voltage specications at the time of delivery from the factry are indicated on the voltage indication seal. Connect the cord in accordance with the specications.

Voltage caution seal

wood screws 2.

Fix the cable with staples 3 supplied with the machine

as accessories in accordance with the forms of use.

* Five staples 3 including the staple for fixing the

operation panel cable are supplied as accessories.

1. N e v e r u s e un d e r th e wr o n g

voltage and phase.

2. When changing the voltage, refer

to the i t e m of " C h a n gi n g the

voltage of 100 / 200V" (P.36).

Voltage indication seal (3-phase type only)

Rating label

• Connecting single phase 200V, 220V, 230V and 240V

Light blue

Table

Control box

Green/Yellow

Brown

Light blue

Brown

Green/Yellow

Plug

Power switch

• Connecting three phase 200V, 220V and 240V

Table

Control box

Green/Yellow

Black

White

Red

Black

White

Red

Green/Yellow

Plug

Power switch

Power source cord

Brown

Light blue

Green/ Yellow

White

Black

Red

G r e e n / Yellow

AC200 V AC220 V AC230 V AC240 V

GND

AC200 V AC220 V AC240 V

GND

－

5. Installation of the sewing machine head

WARNING :

To prevent possible accidents caused by the full of the sewing machine, perform the work by two persons or more when the machine is moved.

1) Fit hinge rubber 1 to the hinge shaft ,and x the

sewing machine main unit.

2) When tightening nut 3 to hinge rubber 1, tighten

nut 3 until spring washer 2 becomes as B in the

illustration, and x it with nut 4.

If tightening hinge rubber 1 excessively,

it will not work properly. So, be careful.

Hold section A when moving the sewing

machine.

2 3

6. Installing the drain receiver and the head support rubber

1) Fix drain receiver 2 in the installing hole of table

with four setscrews 3.

2) Screw in drain bin 4 to drain receiver 2.

3) Insert sewing machine drain pipe 5 into drain bin

4) Insert head support rubber 6 into table 1.

1. Insert drain pipe 5 until it will go no

further so that it does not come off

drain bin 4 when tilting the machine

head.

2. Remove the tape xing drain pipe 5.

7. Safety switch

Remove tape 1 xing the lever section of safety switch 2.

1. When using the safety switch without removing tape 1, it is very dangerous since the

sewing machine works even in the state that it is tillted.

2. In case error 302 occurs when the sewing machine works after setup, loosen the

safety switch tting screw with a screwdriver, and lower the switchto the downside of

the sewing machine.

8. Tilting the sewing machine head

WARNING :

Tilt/raise the sewing machine head with both hands taking care not to allow your ngers to be caught

in the head. Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

When tilting the sewing machine head, tilt the head

gently until it comes in contact with head support rod

1. B efo re tilting the sewing ma chi ne

head, make sure that head support rod

is attached to the machine table.

2. W hen raising the sewin g m achine

head, do not raise it while holding

motor cover 2. It will be the cause of

breakage of motor cover 2.

Be sure to tilt the sewing machine head

on a at place to prevent it from falling.

－

9. Installing the operation panel

Fix operation panel installing plate 1 on the machine

tab le w ith wood scre ws 2 and p ass the cabl e

through hole 4 in the machine table.

Fix the operation panel on panel installing plate 1

with screws 3 supplied as accessories.

Fix the cable on the bottom surface of the table with

the staples supplied with the machine as accessories.

Refer to the gure on the left side when installing the

panel under the table.

10. Connecting the cord

Slowly

Remove four screws E fixing the rear cover of the

electrical box. When opening the rear cover, pressing

it with your hands, slowly open it by approximately

90˚ until it stops as illustrated.

Be sure to lend your hand to the rear

cover in order not to let the rear cover

fall. In addition, do not apply force to the

rear cover opened.

CN16 White

CN16

CN14

CN39

CN42

CN43

CN44

CN45

CN40

CN47

(LK-1901A)

CN38

CN34

CN14 White

16P

26P

White

Yellow

White

Blue

Red

Yellow

White

Gray

Sewing machine head

Operation panel

Earth cord

CN34 Gray

CN45

Yellow

CN47

White

CN40

White

CN38 Gray

CN44 Red

CN42 White

－

CN43 Blue

－

CN39 Yellow

－

1) Take care so that the cord is not caught between

the rear cover and the electrical box main body,

close the rear cover while pressing section A on

the lower side of the rear cover, and tighten four

screws 1.

2) Lower downward the cord located on the side of

the control box and cord presser plate C in the

push hole B, press the cord and tighten screws 2.

How to lock the cord clamp

Lightly press the corner of clamp.

(Cord clamp is locked with a click.)

11. Installing the motor cover

Clamp

How to remove the cord clamp

Lightly pressing

Pull down the clamp.

The clamp goes up.

Install motor cover 1 on the machine main unit with

screws supplied with the machine as accessories.

12. Managing the cord

Slack

1) In the state that the sewing machine is tilted, connect the cords, and bundle them with clip band 1

as shown in the gure.

2) Fix the cords with cords setting plate 2 in the state that the cords slacken as shown in the gure.

When you tilt the sewing machine, make sure that the sewing machine head support bar is

placed on the table.

13. Installing the eye protection cover

WARNING :

Be sure to attach this cover to protect the eyes from the disperse of needle breakage.

Be sure to use eye protection cover 1 after installing

it on installing section 3 with screws 2.

－

14. Installing the thread stand

1) Assemble the thread stand unit, and insert it in

the hole in the machine table.

2) Tighten locknut 1 to x the thread stand.

3) For ceiling wiring, pass the power cord through

spool rest rod 2.

[4] OPERATION OF THE SEWING MACHINE

1. Lubrication

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Check that the place between lower line B and upper

line A is lled with oil. Fill there with oil using the oiler

supplied with the machine as accessories when oil is

short.

* The oil tank which is filled with oil is only for

lubricating to the hook portion. It is possible

to reduce the oil amount when the number of

rotation used is low and the oil amount in the

hook portion is excessive. (Refer to 8. Amount of

oil supplied to the hook of [7] MAINTENANCE.)

1. Do not lubricate to the places other

2. When using the sewing machine for

t h a n t h e o i l ta n k a n d th e hoo k

o f C a u t i o n 2 b e l o w. Tr o u b l e of

components will be caused.

th e f irst time or after an extended

period of disuse, use the machine

after lubricating a small amount of

oil t o the h o ok porti o n. (Ref e r to

2. Ad jus tin g th e ne edl e-t o-s hut tle

relation of [7] MAINTENANCE.)

2. Attaching the needle

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Loosen setscrew 1 and hold needle 2 with the long

groove 3 facing toward you. Then fully insert it into

the hole in the needle bar, and tighten setscrew 1.

If the stitches are made as shown in A,

attach the needle facing to the direction

to a small extent.

－

3. Threading the machine head

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Thin synthetic thread or the like

Pull out the thread by approximately 4 cm from the needle after threading through the needle.

1. When the silicon oil is used, thread through thread guide for silicon 1 (Optional)

2. For thick thread, pass the thread through one hole only of needle bar thread guide 2.

4. Installing and removing the bobbin case

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

1) Open hook cover 1.

2) Raise latch 3 of bobbin case 2, and remove the

bobbin case.

3) When installing the bobbin case, fully insert it into

the shuttle shaft, and close the latch.

If it is not fully inserted, bobbin case 2

may slip off during sewing.

5. Installing the bobbin

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

2.5 cm

1) Set the bobbin 1 int o bobbin case 2 in the

direction shown in the gure.

2) Pass the thread through thread slit 3 of bobbin

case 2, and pull the thread as it is. By so doing,

the thread will pass under the tension spring and

be pulled out from thread hole 4.

3) Pass the thread through thread hole 5 of the

horn section, and pull out the thread by 2.5 cm

from the thread hole.

If the bobbin is installed in the bobbin

case orienting the reverse direction, the

bobbin thread pulling out will result in

an inconsistent state.

6. Adjusting the thread tension

Long

Short

Adjusting the needle thread tension

If t h read t ensio n contro l ler No. 1 1 i s turned

clockwise, the length of remaining thread on the

needle after thread trimming will be shorter. If it is

turned counterclockwise, the length will be longer.

Shorten the length to an extent that the thread is not

slipped off.

Adjust needle thread tension from the operation

panel and bobbin thread tension with 2.

1) Select thread tension with key.

Set needle thread tension with key or key. There is a setting range of 0 to 200. When the

set value is increased, the tension becomes higher.

* The tension is set so that 1.5 N (spun thread

#50) is obtained at the set value 50 at the time

of standard delivery. (When thread tension No.

1 is released)

－

7. Adjusting the thread take-up spring

8. Example of the thread tension

The standard stroke of thread take-up spring 1 is 8

to 10 mm, and the pressure at the start is 0.1 to 0.3N.

1) Adjusting the stroke

Loosen setscrew 2, and turn thread tension asm.

Turning it clockwise will increase the moving

amount and the thread drawing amount will

increase.

2) Adjusting the pressure

To change the pressure of the thread take-up

spring, insert a thin screwdriver into the slot of

thread tension post 4 while screw 2 is tightened,

and turn it. Turning it clockwise will increase the

pressure of the thread take-up spring. Turning it

counterclockwise will decrease the pressure.

When using the sewing machine for the rst time, adjust the thread tension referring to the table below.

Thread

Polyester lament thread #50

Polyester spun thread #50

Polyester spun thread #60

(Thread clamp OFF)

Cotton thread #50

Cotton thread #20

Material

Wool

T/C broad

Denim

Needle thread tension

setting

30 to 35

50 to 55

30 to 35

35 to 45

Thread take-up spring moving

amount [Thread drawing amount]

10mm [13mm]

8 to 10mm [11 to 13mm]

10mm [13mm]

8 to 10mm [11 to 13mm]

Strength

0.1N

0.2N

0.1N

[5] OPERATION OF THE SEWING MACHINE (BASIC)

1. Item data setting

Set each item following the procedure described below.

Setting of the

pattern No.

(1) Turn ON the power switch.

Pattern No. of the item selection lights up, and the pattern No. is indicated on the data display.

(2) Setting of the pattern No.

Setting of the

X scale

Setting of the

Y scale

1) Press the key to indicate the item “Pattern

2) Press the or key to indicate “ 14 ”on

e e

NO” .

the display. (Pattern No. is set to 14.)

Setting of the

max. sewing

speed limitation

Refer the pattern No. to the separate table.

(3) Setting of the X scale

Setting the

thread tension

(4) Setting of the Y scale

1) Press the key to indicate the item “X Scale” .

2) Press the or key to indicate “100”.

(Set X scale to 100%.)

The setting exceeding 100% is dangerous

sinc e needle a n d the clot h presser

interferes with each other and needle

breakage or the like will occur.

1) Press the key to indicate the item “Y Scale” .

2) Press the or key to indicate “100”.

(Set Y scale to 100%.)

The setting exceeding 100% is dangerous

sinc e needle a n d the clot h presser

interferes with each other and needle

breakage or the like will occur.

－

(5) Setting of the max. sewing speed limitation

(6) Setting the thread tension

1) Press the key to indicate the item “Speed” .

2) Pr e s s or key to i n d icate “ 400”.

(Setting of 400 sti/min)

1) Press key to indicate the item “THREAD

TENSION” .

2) Press or key to indicate “50”. (0 to

200 can be set.)

(7) Finish of setting

1) Press the key.

2) After the work clamp feet have moved and gone

up, the sewing LED lights up, and the sewing is

* When key is pressed, the set values of pattern No., X/Y scale, etc. are memorized.

* If key is pressed, you can make sure of the respective setting items again. However, the items

can not be changed in the state that the SEWING LED is lit up.

When key is pressed, the READY LED goes off. Set values of the respective items can be changed.

* Thread tension can be changed even when the sewing LED lights up. Thread tension can be

momorized with the start switch as well.

* Use the machine after confirming the pattern No. When key is pressed while pattern No. is

indicated "0" (state at the time of delivery), error display E-10 appears. At this time, re-set the pattern No.

When turning OFF the power without pressing key, the set values of pattern No., X/Y scale, number of max. rotation, and thread tension are not memorized.

ready.

When the presser is raised, be careful that

ngers are not caught in the presser since

the presser moves after having lowered.

2. Checking the contour of a sewing pattern

WARNING :

2. When making sure of the contour of the sewing pattern, press + / - key with the needle bar lowered,

1. Make sure without fail of the contour of the sewing pattern after selection of the sewing pattern.

If the sewing pattern extends outside the work clamp feet, the needle will interfere with the work

clamp feet during sewing, causing dangerous troubles including needle breakage.

and the work clamp feet move after automatically making the needle bar return to the upper position.

Press key to make the READY LED light up.

2) Select the work clamp foot lowering with

key.

3) Lower the work clamp feet with the foot switch.

T h e s e w i n g m a c h i n e doe s no t

start even when the foot switch is

depressed under this mode.

4) Press key in the state that the work clamp

feet are lowered.

10mm

Clearance

Needle

The work clamp feet do not go up even

when the foot switch is detached.

5) Conrm the contour of the pattern with key

or key.

6) The work clamp feet will go up when key is

pressed.

The work clamp feet do not come down

immediately after turning ON the power.

(Caution) When using a sewing pattern which is

full in lengthwise direction (+10 mm),

make sure of the clearance between

cloth feed base 2 and wiper base 1. If

there is no clearance, loosen setscrew

and move the wiper to the needle

side. Especia l l y w h e n th e ne e dle

position comes to the rear on the right

side, the clearance is decreased.

Clearance

－

3. Sewing

4. Change to the other sewing pattern

/ /

1) Set a workpiece on the work clamp foot section.

2) Depress the pedal switch to the rst step, and the

work clamp feet will come down. If you detach

your foot from the pedal switch, the work clamp

feet will go up.

3) Depress the pedal switch to the second step after

descending the work clamp feet at the rst step,

and the sewing machine will start sewing.

4) After the sewing machine completes sewing,

the work clamp feet will go up, and return to the

sewing start position.

1) Make the Sewing LED go off with key.

2) Press key and select the item of pattern

No .

3) Set the pattern No. with key or key

4) Similarly, setting of X/Y sca le, speed, etc. is

performed.

5) When key is pressed, the Sewing LED

lights up and the sewing machine is in the sewing

ready state.

WARNING :

Make sure without fail of the contour of the sewing pattern after selection of the sewing pattern. If the sewing pattern extends outside the work clamp feet, the needle will interfere with the work clamp feet during sewing, causing dangerous troubles including needle breakage.

5. Winding a bobbin

5-1. To wind a bobbin while the sewing machine is performing sewing

Th rea d t he bob bin winder and wi nd the bob bin

thread onto the bobbin as illustrated in the gure.

5-2. To wind a bobbin independently

1) Press key to make the SEWING LED go

off.

2) Select the bobbin winder with key.

Selection cannot be performed when the

Sewing LED is lit up.

3) Press key. The work clamp feet c ome

down and the Sewing LED lights up.

4) When the pedal switch is depressed, the sewing

machine rotates.

5) When the pedal is depressed again, or key or

key is pressed, the sewing machine stops.

6) When key is pressed, the Sewing LED

goes off, the work clamp feet go up and key becomes effective.

Bobbin winder does not work immediately

after turning ON the power. Perform the bobbin winding after setting pattern No.

or the like once, pressing the key, and making the sewing LED light up.

－

6. Thread clamp device

Trouble of sewing (slip-off of needle thread, stitch skipping, or stain of needle thread) at the time of high-

speed start can be prevented with the thread clamp device. The thread clamp device works in the state

that the thread clamp indication LED lights up and does not work when the LED goes off. Changeover

of ON/OFF motion is performed with key. When the thread clamp device is OFF, the start automatically becomes the slow start.

1. When memory switch No. 35 is "1" (prohibited), the thread clamp does not work. In

addition, key is ineffective.

2. Memory switch, refer to [8] HOW TO USE THE MEMORY SWITCH.

* Matters that demand special attention when using the needle thread clamp device

(1) In case of with the needle thread clamp (motion), make shorter the length of needle thread remaining on

the needle at the sewing start for use. When the length of needle thread is lengthened, needle thread on

the wrong side of material is apt to protrude. In addition, when the length is excessively lengthened, the

end of needle thread held by the needle thread clamp may be rolled in the seams.

33 to 36mm

1) In case of with the needle thread clamp, the

standard of the length of needle thread is 33 to

36 mm.

When needle thread is long after replacing thread

or the like or sewing while holding needle thread by

hand, turn OFF the THREAD CLAMP key.

3) When the needle thread held with the thread

clamp is rolled in the seams, do not draw the

material forcibly and cut the connecting needle

thread with the scissors or the like. The seams

are not damaged since it is the needle thread at

the sewing start.

(2) It is possible to adjust needle thread shorter by making the needle thread clamp work while holding the

stabilized sewing at the start of sewing and the gathering (bird's nest) of needle thread on the wrong side

of material can be lessened. However, for the pattern which the stitch length for neatly rolling in needle

thread is short, needle thread may protrude from the wrong side of material. Select with/without thread

clamp referring to the item below.

1) Whe n the sewi ng l ength is short ( less tha n

(Right side)

approximately 10 mm), the end of needle thread

may protrude like beard even when adjusting

needle thread shorter.

10mm

(Wrong side)

Needle thread

(3) When the type of lower plate 1 that material does not come in close contact with throat plate 2 is used,

needle thread on the wrong side of material may be rolled in the seams regardless of needle thread play

or sewing length.

(Wrong side)

Needle thread

(4) For LK-1903A (button sewing), the thread clamp is set to the motion prohibited in the state of standard

delivery due to the aforementioned (2) and (3). For (memory switch No. 35) with cross-over stitch ( ,

etc.) or X shape ( , etc.), needle thread on the wrong side of material becomes easy to be rolled in. In this case, it is recommended to use the thread clamp.

(5) When the thread clamp is used, and bobbin thread at the sewing start appears on the right side of material,

reduce thread tension at the sewing start (2 to 3 stitches) and bobbin thread becomes less conspicuous.

[Example of setting] Tension of 1 to 2 stiitches at the sewing start is “20” when sewing tension setting is “35”.

* For the setting of tension at the sewing start, refer to 5. Setting the pattern thread tension of [6]

OPERATION OF THE SEWING MACHINE (ADVANCED).

－

[6] OPERATION OF THE SEWING MACHINE (ADVANCED)

1. Performing sewing using the pattern keys ( , , , and )

Patterns (No.1 to 200) which have been already registered can be registered to P1 to P50. It is possible

to change and register the scale, max. speed limitation, thread tension and sewing position. Same as

the patterns (No.1 to 200), P1 to P50 are used by the selection by scrolling the pattern Nos. The pattern

calling from P1 to P25 can be made by one-touch as well.

* When selecting P6 to P25, perform the selection by combination (simultaneous pressing) of ,

, , and keys as shown in the table below.

P-No. Selection key P-No. Selection key P-No. Selection key P-No. Selection key

P1 P1 P8 P1+P4 P15 P4+P5 P22 P2+P3+P4

P2 P2 P9 P1+P5 P16 P1+P2+P3 P23 P2+P3+P5

P3 P3 P10 P2+P3 P17 P1+P2+P4 P24 P2+P4+P5

P4 P4 P11 P2+P4 P18 P1+P2+P5 P25 P3+P4+P5

P5 P5 P12 P2+P5 P19 P1+P3+P4

P6 P1+P2 P13 P3+P4 P20 P1+P3+P5

P7 P1+P3 P14 P3+P5 P21 P1+P4+P5

(1) Register to the pattern key

Setting example : Register following setting to the P2., Pattern No. 3, X scale rate : 50%, Y Scale rate :

80%, Max. speed limitation : 2,000 sti/min, Thread tension : "50", Pattern position : 0.5

mm to the right and 1 mm to the front

1) Turn ON the power switch and press key to enter mode setting (memory switch

setting). (Sewing LED should be put out.)

2) Indicate the pattern register mode with

or key.

3) Press key.

Enter the pattern register mode.

Press key. (Select P-No. to be registered.)

Selection can be performed with or

key.

–

Press key to indicate the Pattern No .

Set the Pattern No. to "3" with or

key.

6) Press key and set as follows with or key.

X Scale rate : “50”%, Y Scale rate : “80”

%, Max. speed limitation : “2000” sti/min,

Thread tension : “50”

7) Pres s key a n d “X Scale r ate ” indication becomes 0.0. Traveling amount in

X direction can be set in 0.1 mm unit. Set 0.5

with or key.

8) Pres s key a nd “Y S c a le rate ” indication becomes 0.0. Traveling amount in

Y direction can be set in 0.1 mm unit. Set –1.0

with or key.

9) Press key to nalize the setting.

10) Press key.

Pattern register mode is nalized.

11) Press key.

Mode setting is nalized and the mode returns to the normal mode.

－

(2) Sewing operation

Operation example : After performing sewing with the contents of the registered P2, perform sewing with

the contents of P3.

1) Turn ON the power switch.

2) Press the key.

3) Press the key, and when the sewing LED lights up, the work clamp foot goes up after it has

moved.

⇔

4) Check the contour of the sewing pattern.

(Refer to the item “Checking the contour of a

sewing pattern”.)

5) If the contour of the sewing pattern is acceptable,

the sewing can be made.

6) Press key after completion of sewing and the presser comes down. The presser moves to

the sewing start point after origin retrieval and

goes up. (The P keys can operate the pattern

chage by one-touch even when the sewing LED

is lighting up.)

7) Perform the above items 4) and 5).

* The P1 to P25 can be indicated on the display

when selecting the pattern by pressing the

or key.

⇔

0 to 200 ,/ P1 to 25

P1 to P25 which have not been registered are not

indicated.

Press P1 to P25 key while the sewing

LED lights up and the presser comes

down. Be careful that your fingers are

not caught in the presser.

Pattern register from P26 to P50 can be

performed. Register can not be performed

in to key. Designate the pattern by the pattern selection only. Indicate the

pattern with or key.

0 to 200

Patt e r n s e l ecti o n f r o m P26 to P50

cannot be performed while the sewing LED lights up.

P1 to P25

P26 to P50

2. Performing sewing using the combination function

By arranging in the order of use of the pattern register (P1 to P50) which have been already registered

and registering in C1 to C20, the sewing pattern will change in the order every time the sewing machine

nishes the sewing. Every one combination No. can be registered up to the maximum 30 patterns.

(1) Register of the combination

Setting example : Combine in the order of P1, P2 and P3, and register them in the C1.

1) Turn ON the power switch and press key to enter the mode setting (memory switch

setting). (Sewing LED should be put out.)

2) Indicate the combination mode with or

key.

3) Press key. Sewing LED lights up to enter the combination mode.

C1 t o C20 can be s elec ted with o r

key.

4) Press key, and then press key.

P1 is set to the rst pattern of C1. P1 to P50 can

be selected with or key as well.

5) Press key, and then press key. P2 is set to the second pattern of C1. P1 to P50

can be selected with or key as well.

6) Press key, and then press key. P3 is set to the third pattern of C1. P1 to P50 can

be selected with or key as well.

7) Press key to nalize the register.

8) Press key.

Combination register mode is nalized.

–

9) Press key.

Mode setting is nalized and the mode returns

to the normal mode.

－

(2) Sewing operation

Operation example : Perform sewing with the contents of the registered C1.

1) Turn ON the power switch.

2) Set the pattern No. to “C1-1 ” using the or

key. Scroll as follows :

0 to 200 ,/ P1 to P50 ,/ C1 to C20

⇔

3) Press the key. When the sewing LED lights up, the work clamp feet will go up after having

moved.

4) If the contour of the pattern is acceptable, the

sewing can be made.

5) Every time the sewing is nished, the step is made

in the order of the combination. After completing

one cycle of sewing, the step returns to the first

step. The sewing can be made repeatedly.

“C1. 1” / “C1. 2” / “C1. 3”

* When yo u desire to return the pattern to th e

prev i ous o n e or skip the n e xt patt e rn afte r

sewing, press or key in a state that the sewing LED lights up. The indication of the

pattern will change, and the work clamp feet will

move to the sewing start point.

* If the contents of P1 to P50 are changed after

registration of C1 to C20, the contents of P1 to

P50 used in C1 to C20 will change. So, be careful.

* Make sure of the contour of the pattern for each

of the patterns. (Refer to the item “2. Checking

the contour of a sewing pattern”.)

3. Performing sewing using the “bobbin thread counter”

The production counter can be used as the bobbin thread counter. In case a same sewing pattern is sewn

in repetition, the sewing machine will stop sewing when the number of times (the specied number) that

can be sewn with a bobbin is reached. The bobbin thread counter is of the subtracting method.

The counter at the time of delivery is set to the production counter (adding method).

If it is used as the bobbin thread counter, it is necessary to change over memory switch

No. 18. (Refer to the item "[8] HOW TO USE THE MEMORY SWITCH", P. 38.)

1) Press key to indicate the Counter .

2) Then press the key.

3) Then press the or key, and set the

specied number of times that can be sewn with

a bobbin.

4) Every time the sewing machine nishes a sewing

cycle, counting-down is made by one.

5) When the sewing machine nishes the specied

number of times, the sewing machine does not

start even if depressing the pedal.

6) Replace the bobbin with a new one, and press

the key. The value of the counter returns to the set value.

7) Repeat the steps of procedure from the steps 4)

to 6).

4. How to use the temporary stop

When memory switch No. 31 is set to "1", key can be used as the temporary stop key. (Refer to "

HOW TO USE THE MEMORY SWITCH

1) Sew i ng m a chin e stop s by m e ans o f key. Error 50 is indicated, the error release is

performed using key.

2) There are three operations after the release as below.

Re-start of sewing by means of the start switch.

Press key to perform thread trimming, perform positioning with or key, and re-

start by means of the start switch.

" P.38.)

Press key to perform thread trimming, and press again key to return to the origin.

－

5. Setting the pattern thread tension

Needle thread tension for 6 stitches at the sewing start, the portion which is changed over from basting

stitch to zigzag stitch, and the portion of tie stitch at the sewing end can be individually set.

3), 4)

1) While the sewing LED lights up, press key to indicate the needle thread tension .

2) Lower the presser with the foot pedal.

When the foot pedal is depressed until

it will go no further, the sewing machine starts. So, be careful.

3) Move the feed with key.

4) “c” is indicated at the position where the tension

setting is possible.

5) Pressing key, set the tension with or

key.

6) Repeat steps 3), 4) and 5) to set the tension.

7) When setting is completed, press key.

The presser moves to the origin and goes up.

－

6. Cautions in operation

(1) When the error indicator lamp lights up, be sure to check the cause of trouble and take a proper

corrective measure.

(2) Do not draw, by hand, the material being sewn during sewing. Doing so will cause the needle shift

from the correct position. If the needle moves from the correct position, press the key two times. This will return the needle to the normal origin.

(3) Do not turn OFF the power in a state that the needle is lowered. The presser comes down and the

wiper interferes with needle. As a result, there is a danger of needle breakage or the like.

Reference for the sewing speed to be applied

Sewn product / thread / needle Head type / Sewing speed

8-layered denim / Cotton thread #50 / DPx5 #16 S (Standard) / 3,000 sti/min

8-layered woolen gabardine / Polyester lament #50 / DPx5 #14 S (Standard) / 2,300 sti/min

8-layered denim / Cotton thread #20 / DPx17 #19 H (Heavy-weight material)/3,000 sti/min,

W (Double-capacity hook)/2,700 sti/min

Overlapped sewing of 6 x 12-layered denim / Cotton thread #20 / DPx17 #19

Tricot + shoulder strap (3 + 1) layered section / Polyester spun #60 / DPx5 #11 F (Foundation) / 2,000 sti/min

* To prevent the thread breakage due to the needle heat, set the sewing speed referring to the above

table in accordance with the sewing conditions.

* For sewing the foundation or the like, lower the height of the needle bar to prevent the stitch skipping.

(Refer to the item “Adjusting the height of the needle bar”)

H (Heavy-weight material) / 2,500 sti/min

[7] MAINTENANCE

1. Adjusting the height of the needle bar

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

: Upper

: Engraved line

for DP x 5

: Engraved line

for DP x 17

is for H and W types only

Bring needle bar 1 to the lowest position of its stroke. Loosen needle bar connection screw 2 and adjust so that upper marker line 4 engraved on the needle bar aligns with the bottom end of needle bar bushing, lower 3. For F type only, adjust the needle bar to the position where it is lowered by 0.8 mm to 1 mm from the center of upper marker line 4 engraved on the needle bar.

engraved line

0.8 to 1mm

F type only.

After the adjustment, make sure that there is no uneven torque.

When stitch skipping occurs in accordance with the sewing conditions, adjust the height of the needle

bar so as to lower it by 0.5 to 1 mm from the needle bar engraved line 4.

－

2. Adjusting the needle-to-shuttle relation

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Relation between needle and engraved lines

0 mm

1) Turn the handwheel by hand. When needle bar

has gone up, adjust so that lower marker line

engraved on the needle bar aligns with the

bottom end of the needle bar bushing 3 , lower.

2) Loosen setscrew 1 in the driver. Open inner

hook pressers 2 to the right and left, and remove

inner hook presser 3 .

At this time, be careful not to let inner

hook 4 come off and fall.

Adjust so that the blade point of inner hook 4 aligns

with the center of needle 5 , and that a clearance

of 0 mm is provided between the front end of the

driver and the needle as the front end face of driver

receives the needle to prevent the needle from

being bent. Then tighten setscrew 1 of the driver.

0.05 to 0.1 mm

0 mm

7.5 mm

4) Loosen setscrew 7 of the shuttle, and adjust

the longitudinal position of the shuttle. To do this

adjustment, turn shuttle race adjusting shaft 8

clockwise or counterclockwise to provide a 0.05

to 0.1 mm clearance between needle 5 and the

blade point of inner hook 4 .

5) After adjusting the longitudinal position of the

shu t tle, furth er adj ust t o provi d e a 7.5 mm

clearance between the needle and the shuttle

by adjusting the rotating direction. Then tighten

setscrew 7 of the shuttle.

App l y a sma ll amou nt of oil t o race

section 9 and oil wick

, and use the

sewing machine after an extended period

of disuse or cleaning the periphery of

hook portion.

3. Adjusting the lift of the work clamp foot

WARNING :

As the work is performed while the power is ON, never touch the switches other than the necessary one so as to prevent accidents caused by the malfunction of switches.

Max. 17 mm

At this time, be careful not to cause work clamp foot lever support plate 8 to interfere with

feed bracket 9 .

If the work clamp foot lever support plate interferes with the wiper, readjust the height of

the wiper using setscrew !0 in the wiper installing base.

1) With the machine i n st op mode, remove six

setscrews 1 of the top cover, and take off top

cover 2 .

2) Apply L-shaped wrench 3 to socket bolt 5 of

clamp 4 , and loosen the socket bolt.

3) Pu sh dow n L -shaped wrench 3 to increa se

the lift of the work clamp foot, or pull it up to

decrease the lift.

4) After the adjustment, securely tighten socket bolt

5) If the right a nd l eft wor k clamp feet are not

levelled, loosen fixing screw 7 and adjust the

position of the work clamp foot lever support

plate 8 to level them.

4. The moving knife and counter knife

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

0.5 mm

Throat plate

18.5 mm

1) Loosen adjusting screw 3 so that a clearance

of 18.5 mm is provided between the front end of

the throat plate and the top end of thread trimmer

lever, small 1 . To adjust, move the moving knife

in the direction of arrow.

Loosen setscrew 5 so that a clearance of 0.5 mm

is provided between needle hole guide 2 and

counter knife 4 . To adjust, move the counter knife.

－

5. Needle thread clamp device

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

1) When t hrea d is cau ght at t op end 1 of t he

thread clamp, thread clamp becomes incomplete

and sewing trouble at the sewing start will be

caused. Remove it with tweezers or the like.

2) When removing thread waste or thread dust

collected on the thread clamp device, remove it

after removing the throat plate.

6. Adjustment of the wiper

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

1.5 mm or more

23 to 25 mm

1) Loosen screw 1 to adjust so that a clearance of

1.5 mm or more is provided between the wiper

and the needle.

At this time, the standard of the distance between

the wiper and the needle is 23 to 25 mm. By

adjusting the distance wide, the work clamp foot

can prevent stepping on needle thread when it

comes down.

Especially when the thin needle is used, adjust

the distance wide to such an extent of 23 mm.

* The position of the needle is when the sewing

mechine has stopped after the sewing nished.

7. Draining waste oil

8. Amount of oil supplied to the hook

When polyethylene oiler 1 becomes lled with oil,

remove polyethylene oiler 1 and drain the oil.

1) Loosen setscrew 1 and remove setscrew 1 .

2) When screwing in adjustment screw 2 , the

amount of oil of oil pipe, left 4 can be reduced.

3) After the adjustment, screw in setscrew 1 and

x it.

1. The state of standard delivery is the

position where 3 is lightly screwed

in and returned by 4 turns.

2. W hen red ucing t he amount of oil,

do not screw in the screw at once.

Observe the state for approximately

half a day at the position where 3 is

screwed in and returned by 2 turns.

If reducing is excessive, worn-out of

the hook will result.

9. Replacing the fuse

WARNING :

1. To avoid electrical shock hazards, turn OFF the power and open the control box cover after about

ve minutes have passed.

2. Open the control box cover after turning OFF the power without fail. Then, replace with a new fuse

with the specied capacity.

The machine uses the following three fuses :

For pulse motor power supply protection

5A (time-lag fuse)

For solenoid and pulse motor power supply

protection

3.15A (time-lag fuse)

For control power supply protection

2A (fast-blow type fuse)

－

10. Changing the voltage of 100/200V

WARNING :

To prevent personal injuries caused by electric shock hazards or abrupt start of the sewing machine, carry out the work after turning OFF the power switch and a lapse of 5 minutes or more. To prevent accidents caused by unaccustomed work or electric shock, request the electric expert or engineer of our dealers when adjusting the electrical components.

It is adaptable to the voltage of single phase 100V to 120V/3-phase 200V to 240V by changing the voltage changeover connector mounted on FLT p.c.b.

(Caution) When the changing procedure is wrong, the control box will be broken. So, be very careful.

Changing procedure of the changeover connector

1. Turn OFF the power source with the power switch

after conrming that the sewing machine has

stopped.

2. Draw out the power cord from the power plug

socket after conrming that the power switch is turned OFF. Then wait for ve minutes or more.

3. Remove the front cover.

4. Remove four screws xing the rear cover of the

control box and slowly open the rear cover.

A. In case of using with 3-phase 200V to 240V

• Changing the changeover connector Connect to 200V the 100/200V changeover

connector of FLT p.c.b. 1 located on the side of the Box Side of the control box.

•

Connect the crimp style terminal of AC input cord

to the power plug as shown in the gure.

B. In case of using with single phase 100V to 120V

• Changing the changeover connector Connect to 100V the 100/200V changeover connector of FLT p.c.b. 1 located on the side of the Box Side of the control box.

•

Connect the crimp style terminal of AC input cord

to the power plug as shown in the gure.

WHITE

BLACK

RED

GREEN/ YELLOW

(Plug side)

WHITE

BLACK

RED

GREEN/

YELLOW

(Caution) Securely perform the insulation

treatment to the red terminal which is

not used with insulation tape or the like.

(When the insulation is insufcient,

there is a danger of electric shock or leakage current.)

In case of using with single phase 200V to 240V

• Changing the changeover connector Connect to 200V the 100/200V changeover

WHITE

BLACK

RED

(Plug side)

WHITE

BLACK

RED

connector of FLT p.c.b. 1 located on the side

GREEN/ YELLOW

GREEN/

YELLOW

of the Box Side of the control box.

•

Connect the crimp style terminal of AC input cord

to the power plug as shown in the gure.

(Caution) Securely perform the insulation treatment to the red terminal which is

not used with insulation tape or the like.

(When the insulation is insufcient,

there is a danger of electric shock or leakage current.)

Check that the change has been performed without

fail before closing the rear cover.

6. Be careful that the cord is not pinched between the rear cover and the control box main unit. Close the rear cover while pressing the lower side of rear

WHITE

BLACK

RED

GREEN/ YELLOW

(Plug side)

WHITE

BLACK

RED

GREEN/

YELLOW

cover, and tighten four screws.

11. Replenishing the designated places with grease

When the sewing machine has been used for a certain number of times of sewing, error code No. E220 is displayed on the operation panel at the time of turning ON the power. This display informs the operator of the time of replenishing the designated places with grease. Be sure to replenish the places with the grease below. Then call the memory switch No. 245 and set it to "0" with the RESET key. Even after the display of the error No. E220, when the RESET key is pressed, the error is released, and the sewing machine can be continuously used. Afterwards, however, the error No. E220 is displayed every time the power is turned ON. In addition, when the sewing machine is used further for a certain period of time after the display of error No. E220, the error No. E221 is displayed and the sewing machine fails to operate since the error cannot be released even when the RESET key is pressed. When the error No. E221 is displayed, be sure to replenish the designated places below with grease. Then start up the memory switch and set No. 245 to "0" with the RESET key.

1. After replenishing the places with grease, the error No. E220 or No. E221 is displayed

again unless the memory switch No. 245 is changed to "0".

2. Use grease tub e (Part No. 40013640) supplied a s ac cessori es to repl enish the

designated places below with grease.If grease other than the designated one is

replenished, damage of components will be caused.

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

(1) Replenishing the eccentric cam section with grease

1) Open the upside cover and remove the grease

2) Remove rubber cap 2 located on the side of

(2) Replenishing the oscillator pin section with grease

1) Tilt the machine head and remove the grease

2) Remove setscrew 4 in oscillator gear 3 , screw

3) Securely tighten setscrew 4 which has been

cover 6.

eccentric cam 1 . Then replenish there with

grease.

cover 7 .

in the grease tube attached joint 5 supplied as

accessories, and replenish there with the grease.

removed after replenishing with the grease.

－

[8] HOW TO USE THE MEMORY SWITCH

The sewing machine operation can be changed by changing the setting of the memory switch.

1. Start and change of the memory switch

1) When key is pressed in the state that the sewing LED is put out, the memory switch

setting mode is obtained.

1.3 0 wh ich i s ind i cated when "M" k ey i s

pressed indicates that the max. speed limitation

of the rst memory switch is 3,000 sti/min. (State

at the time of delivery from the factory)

2) Change the memory switch No. with or

key.

3) Adjust the memory switch No. to the No. you

desire to change, and press key. The sewing LED lights up.

4) Change the contents of the memory switch

with or key.

Three figures from

the top are memory

switch Nos.

Two gures from the

bottom are contents

of setting.

5) The value can be returned to the value at the time of delivery from the factory with key.

6) Press key to register the contents of change. Sewing LED goes off and the mode returns to the selective state of the memory switch No.

7) Press key to nalize the memory switch setting mode and the mode returns to the normal mode.

2. Example of the memory switch setting

(1) Setting the max. sewing speed limitation

Setting example : Setting the max. sewing speed limitation to 1,800 sti/min

1) Press key in the state that the sewing LED is put out.

The memory switch is started and the contents

of memory switch No. 1 are indicated.

It is not necessary to change the sewing

speed since the max. speed limitation of the

sewing machine is set with memory switch

No. 1. The indicated memory switch No. can

be changed over with or key.

2) Press key in the state that memory switch No. 1 is indicated to make the sewing

LED light up. The contents of memory switch

No. 1 (max. sewing speed limitation value of

the sewing machine) are indicated.

3) Set "1800" with or key.

4) Register the value with key. Sewing LED goes off.

5) Press key to return to the normal state.

The sewing machine speed in the normal state cannot be increased more than the value

which has been set here.

(2) Setting the soft start speed at the sewing start

The speed of the first stitch to the fifth stitch at the sewing start can be set in a unit of 100 sti/min.

Two kinds of settings, in case of with needle thread clamp and of without needle thread clamp can be

performed. (See Table of functions of the memory switch.)

In case of with needle thread clamp Unit : sti/min

State when delivered Setting range

1st stitch 1500 400 to 1500

2nd stitch 3000 400 to 3000

3rd stitch 3000 400 to 3000

4th stitch 3000 400 to 3000

5th stitch 3000 400 to 3000

For the max. sewing speed, the memory switch No. 1 (max. sewing speed limitation) has

priority.

Setting example : In case of with needle thread clamp, the speed is changed as follows.

1st stitch from 1,500 to 1,000 sti/min and 2nd stitch from 3,000 to 2,000 sti/min

1) Press key in the state that the sewing LED is put out.

2) Indicate memory switch No. 2 with or

key.

Here, set the sewing speed of the rst stitch.

3) Press key. The sewing LED lights up

and the set value of the rst stitch is indicated.

－

4) Indicate "1000" with or key. The value returns to the initial value at the time of

delivery from the factory with key.

Press key to cancel the operation here

and return to the state of step 2).

5) Press key. The sewing LED goes off

and the set value of the rst stitch is registered.

6) Indicate memory switch No. 3 with or

key.

Here, set the sewing speed of the second stitch.

7) Press key The sewing LED lights up and the set value of the second stitch is indicated.

8) Indicate "2000" with or key.

The value returns to the initial value at the

time of delivery from the factory with key.

Press key to cancel the operation here

and return to the state of step 6).

9) Press key. The sewing LED goes off and the set value of the second stitch is registered.

10) Press key. The memory switch setting mode is nalized and the mode returns to the normal mode.

(3) Setting whether the calling of pattern data is operative or not

By making inoperative the calling of the unnecessary pattern, this setting prevents the different pattern

from calling by mistake.

Also, it is possible to call and use the necessary pattern.

Setting example : Make the calling of pattern Nos. 2 and 3 inoperative.

1) Press key in the state that the sewing LED is put out.

2) Indicate memory switch No. 201 with or

key.

3) Press key. The sewing LED lights up and the set value of pattern No. 1 is indicated.

Set value 1 : Calling is operative.

Set value 0 : Calling is inoperative.

4) Set pattern No. 2 with or key.

5) Set the set value to "0" with key.

6) Set pattern No. 3 with or key.

7) Set the set value to "0" with key.

8) Press key to register the set value. The sewing LED goes off.

9) Press key. The memory switch setting mode is nalized and the mode returns to the normal mode.

(4) Setting the counter operation

Setting example : The production counter (adding method) can be changed to the bobbin thread counter

(subtracting method).

1) Press key in the state that the sewing LED is put out.

2) Indicate memory switch No. 18 with or

key.

Press key. The sewing LED lights up and the set value of counter motion is indicated.

4) Set the set value to "1" with key.

Set value 0 : Production counter

Set value 1 : Bobbin thread counter

5) Press key to register the set value. The sewing LED goes off.

6) Press key. The memory switch setting mode is nalized and the mode returns to the normal mode.

－

3. Table of functions of the memory switch

Various operations of sewing machine can be set in programs by operating the memory switches.

There are items that change the initial values at the time of delivery according to the models.

Indication

Function

Max. sewing speed (Speed can

be set in a unit of 100 sti/min.)

Sewing speed of 1st stitch (With

needle thread clamp) (Speed can

be set in a unit of 100 sti/min.)

Sewing speed of 2nd stitch (With

needle thread clamp) (Speed can

be set in a unit of 100 sti/min.)

Sewing speed of 3rd stitch (With

needle thread clamp) (Speed can

be set in a unit of 100 sti/min.)

Sewing speed of 4th stitch (With

needle thread clamp) (Speed can

be set in a unit of 100 sti/min.)

Sewing speed of 5th stitch (With

needle thread clamp) (Speed can

be set in a unit of 100 sti/min.)

Thread tension of 1st sti tch

(With needle thread clamp)

Thread tension at the time of

thread trimming

Changeover timing of thread

tension at the time of thread

trimming

Se win g speed of 1st sti tch

(Without needle thread clamp)

(Speed can be set in a unit of

100 sti/min.)

13. Se w ing sp e e d of 2 n d

stitch (Without needle thread

clamp) (Speed can be set in a

unit of 100 sti/min.)

Se wing sp ee d of 3r d stitch

(Without needle thread clamp)

(Speed can be set in a unit of

100 sti/min.)

Se wing sp eed o f 4th s titch

(Without needle thread clamp)

(Speed can be set in a unit of

100 sti/min.)

Se wing sp eed o f 5th s titch

(Without needle thread clamp)

(Speed can be set in a unit of

100 sti/min.)

Thread tension of 1st sti tch

(Without needle thread clamp)

Changeover timing of thread

te nsion at th e sew in g sta rt

(Without needle thread clamp)

S e t t i n g w h e t h e r o r n o t

indicat ion or chan ge of X/Y

sc ale r at e and max . spe ed

limitation is acceptable.

(Prevention of misapplication)

Setting range

400 to 3000

400 to 1500

400 to 3000

0 to 200

-6 to 4

400 to 1500

400 to 3000

0 to 200

-5 to 2

0 : Operative

1 : Inoperative

State when delivered

3000

1500

3000

200

400

900

3000

-5

Remarks

For LK-1903A, set to 2700.

In case of set ti ng 1, us e of

M key is prohibite d as well.

W h e n c ha ng in g me mo ry

switch, pressing M key, turn

ON the power switch.

Indication

Function

Counter operation

Selection of pedal

Selection of start pedal

Optional pedal 1 operation

Optional pedal 2 operation

Height of work clamp foot at

the time of 2-step stroke

Sel ect i on of b ase po int of

pattern enlargement/reduction

Sewing machine operation can be

stopped with panel key (clear key).

Buzzer sound can be prohibited.

Number of stitches that needle

thread clamp releases is set.

Cl amp ing timi ng of ne edl e

thread clamp can be delayed.

Needle thread clamp control

can be prohibited.

Feed timing is selected.

When stitches ar e no t well-

tightened, set the value in “–”

direction.

State of work clamp foot after

completion of sewing can be

selected.

Execution of origin retrieval

every tim e af ter compl etion

of sewing can be performed.

(Except cycle stitching)

Setti ng of origin retri eval in

cycle stitching can be set.

Setting range

0 : P r oduct i o n cou n t e r

(adding)

1 : Bobbin thread counter

(subtracting)

0 : Standard pedal

1 : Standard pedal (2-step

stroke)

2 : Optional pedal

3 : Optional pedal (2-step

stroke)

0 : Standard pedal

1 : Optional pedal

0 : OFF when depressing

pedal again

1 : OFF when detach in g

from pedal

0 : OFF when depressing

pedal again

1 : OFF when detach in g

from pedal

50 to 90

0 : origin

1 : Sewing start point

0 : Ineffective

1 : Panel reset key

2 : External switch

0 : Without buzzer sound

1 : Panel operation sound

2 : Panel operation sound

+ error sound

1 to 7 stitches

-10 to 0

0 : Normal

1 : Prohibited

-8 to 16

0 : Work clamp foot goes

up after moving at the

sewing start

1 : Work clamp foot goes

up imm ed ia tely afte r

the end of sewing.

2 : Work clamp foot goes

up by pedal operation

afte r m o v ing at the

sewing start.

0 : Without origin retrieval

1 : With origin retrieval

0 : Without origin retrieval

1 : Every time 1 pattern is

completed

2 : Ev ery time 1 cycl e is

completed

State when delivered

Remarks

Height is low ered when the

set value is increased.

Timing is delayed in “-” direction.

Mis appl ica t ion of p ane l is

protected. For LK-1903A, set

to "1".

Setting on excessive “–” side

may cause needle breakage.

B e c a r e f ul wh en sewi n g

heavy-weight material.

For LK-1903A/BR35, set to “0”.

－

Indication

Function

State of work clamp foot when

machine stopped by temporary

stop command can be selected.

Needle bar stop position is set.

T h r e a d tr im mi ng can be

prohibited.

Route of origin return by means

of clear key can be selected.

Bobbin winding speed can be set.

Setting range

0 :

Work clamp foot goes up.

1 : Work clamp foot goes

up w i t h wo r k cl amp

foot switch.

2 : Lift of work clamp foot

is prohibited.

0 : UP position

1 : Upper dead point

0 : Normal

1 : T h r e a d t r i m m i n g

prohibited

0 : Straight line return

1 :

Reverse return of pattern

800 to 2,000

State when delivered

1600

Remarks

Need l e ba r ro t a t es i n the

reverse direction after the UP

position stop and stops when

upper dead point stop is set.

Th is fun ct io n is us ed whe n

straight lin e retur n from the

midway of pattern to the start

of sewing is not possible.

Max. speed limitation has priority.

Operation timing of material

closing is selected.

LK-1901A only

Wiper operation method can

be selected.

Tie sti tch in g a t t he st art of

sewing of the pattern for button

sewing can be prohibited. For

LK-1903A only

Position of origin moves 5 mm

to the front.

This function sets whether or

not the calling of the pattern

data is operative.

Gre a s e re p len i s hing t ime

information counter

Reg i s t er o f th e pa t t ern i s

performed.

is performed.

0 : Output prohibited

1 :

Operation w he n work

clamp foot comes down.

2 : Operation at the time

of start

0 : Wit hout wiper at t he

time of thread trimming

on the way

1 : With wiper at the time

of thread trimming on

the way

2 : With wiper at the time

of thread trimming on

the way

3 : Magnet wiper

0 : Tie stitching effective

1 : Tie stitching ineffective

0 : Standard

1 : Front

0 : Calling inoperative

1 : Calling operative

Setting depends on

the model used.

–

For the machines other than

LK-1901A, this function is not

indicated.

Without return of the last wiper

: With return of the last wiper

For the machines other than

LK-1903A, thus function is not

indicated.

Necessary to set this function

when using work clamp foot

and pattern of LK-1904

Service pattern Nos. 1 to 64

can be individually set.

Refer to the item “Replenishing

the des i gnat e d p l ace s wi t h grease” of MAINTENANCE, p.37.

Refer to the item “Performing

sewing u s i n g th e p a t t e rn keys”, P. 24.

Refer to the item “Performing

sewing using the combination function”, P. 27.

[9] OTHERS

1. Setting the DIP switch

SDC p.c.b.



MAIN p.c.b.

When “4” of DIP switch 2 on SDC circuit board 1 is

turned ON, the penetrating force is increased. Turn it

ON when the penetrating force is insufcient.

Turn OFF all DIP switches other than the switch above.

Perform the changeover of DIP switch

after turning OFF the power.

Be very careful of the heat of the main

shaft motor.

Turn OFF all DIP switches of MAIN p.c.b.

－

2. Table of the standard pattern specications

NO Lengthwise Crosswise Number of stitches Pattern S, F, H M

1 2.0 16 42 Large size bartacking

2 2.0 10 42 Large size bartacking

3 2.5 16 42 Large size bartacking

4 3.0 24 42 Large size bartacking

5 2.0 10 28 Large size bartacking

6 2.5 16 28 Large size bartacking

7 2.0 10 36 Large size bartacking

8 2.5 16 36 Large size bartacking

9 3.0 24 56 Large size bartacking

10 3.0 24 64 Large size bartacking

11 2.5 6 21

12 2.5 6 28

13 2.5 6 36

14 2.0 8 14 Knit goods bartacking

15 2.0 8 21 Knit goods bartacking

16 2.0 8 28 Knit goods bartacking

17 0 10 21 Straight line bartacking

Small size bartacking (eyelet)

＊

18 0 10 28 Straight line bartacking

19 0 25 28 Straight line bartacking

20 0 25 36 Straight line bartacking

21 0 25 41 Straight line bartacking

22 0 35 44 Straight line bartacking

23 20 4.0 28 Lengthwise bartacking

24 20 4.0 36 Lengthwise bartacking

25 20 4.0 42 Lengthwise bartacking

26 20 4.0 56 Lengthwise bartacking

27 20 0 18

28 10 0 21

29 20 0 21

30 20 0 28

38 2.0 8 28 Knit goods bartacking

In the condition of delivery from the factory, the pattern sewing with ＊ marks can be made.

When using the standard patterns other than the pateterns with ＊ marks, refer to “Setting whether the

calling of the pattern data is operative or not” described in the item of the how to use the memory switch.

Lengthwise straight line bartacking

＊

3. Table of the standard patterns

Large size bartacking

Small size bartacking Knit goods bartacking

(51)

※

Stitch diagram

Number of

stitches

Sewing size

(mm)

Length-

Cross-

wise

2.0

2.5

3.0

2.0

2.5

2.0

2.5

3.0

2.5

wise

(Note 2)

No. of work

clamp foot

3 1 2 3

1 2

2 3

Straight line bartacking

Lengthwise bartacking

Lengthwise straight line bartacking

(Other side)

Stitch diagram

stitches

(This side)

Number of

Sewing size

(mm)

Length-

wise

Cross-

wise

4.0

(Note 2)

No. of work

clamp foot

1 2

3 1

2 3

(Note3)

2.5

2.0

(Other side)

(This side)

1. Sewing size shows the dimensions when

the scale rate is 100%.

2. Refer the No. of work clamp foot to the separate table of work clamp foot.

3. For No. 22, process the work clamp foot blank for use.

5. No. 51 is for the machine without thread

－

Use the patterns with ※marks for sewing denim.

clamp device.

－

Semilunar bartacking

Stitch diagram

Number of

stitches

Sewing

size (mm)

Cross-

Length-

wise

(Note 2)

No. of work

clamp foot

Stitch diagram

Number of

stitches

Sewing

size (mm)

Cross-

Length-

wise

2.5

(Note 2)

No. of work

clamp foot

Large size bartacking

Knit goods bartacking

Round bartacking

2.5

Lengthwise bartacking

2.5

ø12

2.5

(Caution)

Pattern Nos. 41 to 46 are for the optional

work clamp foot No. 12. The origin of the

patterns is different by 5 mm up and down

from that of lengthwise bartacking pattern

Nos. 23 to 26.

Radial tacking

148

164

ø8

4. Table of the work clamp foot

1 2 3 4 5

13518659 (asm.) 13548557 (asm.) 13542964 (asm.)

Work clamp foot

Feed plate

Sewingspecication

Finger guard

※

20 27

32.8

4.5

32.3

5.1

14116107 14116404 14116800 14116305 14116206

(With knurl)

 

17.5

(Without knurl)(Without knurl)

14.5

17.5

14.5

(With knurl)

4.6

21.2

(With knurl)

5.4

11.4

S F F H / W M

13533104

33.4

3.4

4.8

Suppli ed wit h F (fou nda tio n) type machine head. (Depends on the destination)

Remarks

S t a n d a r d accessory for S (standard) type machine head.

Install a nger guard suitable for each work clamp foot when replacing the work clamp foot.

※

Optional

S t a n d a r d accessory for M (knit goods) type machine head.

－

6 7 8 9 10 11

13548151(asm.) 13542451 (asm.) 13571955 (asm.) 13561360 (asm.)

Work clamp

foot

Feed plate

Sewing

specication

Finger

※

guard

Remarks

24.1

40.5

32.6

32.8

4.5

5.6 12

13548003 13554803 14116602 14116503 14116909 14116701

(With knurl)

   

18.5

37.3

(With knurl)

27.4

5.4

(With knurl)

(Without knurl) (Without knurl) (Without knurl)

2.4

17.5

5.6

S H / W S F F F

13548300 13533104 13573407

S t a n d a r d acc ess ory fo r H

Optional Optional

type (Heavy-weight m a t e r i a l ) a n d W t y pe( Doub lec a p a c i t y h o ok ) machine head.

Accessory part for F (foundation) type. (Depends on the destination)

Optional

Work clamp

foot

Feed plate

Sewing

specication

Finger

※

guard

14137509 (right) 14137608 (left)

13.6

14137707

(Without knurl)



16.6

14135305

40021871 (right) 40021872 (left)

23.5 41

40021873

(With knurl) (With knurl)

9.4

14.4

40021874 (right) 40021875 (left)

ø12

40021876

ø12.4

13533104

40021877 (right) 40021878 (left)

12 29

40021879

(With knurl)

40021880 (right) 40021881 (left)

ø10

40021882

(With knurl)

ø10.4

ø14

ø14.4

Remarks

Install a nger guard suitable for each work clamp foot when replacing the work clamp foot.

※

Optional

－

Optional

5. LK-1900 data ROM

6. Connection of the optional pedal

Insert LK-1900 data ROM to the IC socket on MAIN

p.c.b for use.

1. Be careful of the inserting direction.

2. EEPROM cannot be used.

3. W hen the pat tern No. is t he same

as that of the standard pattern, the

pattern in the data ROM is prior to

other pattern.

ROM which can be used :

27C256 EPROM

JUKI Part No. : HL008423000

(1) Connection of PK-57

1) Connect PK-57 change cable 2 with CN41 of

MAIN circuit board 1 .

2) Connect the cord of PK-57 3 with the PK-57

change cable at the rear face of the control box.

Then clamp two places with adhesive clamp 4 .

In a ddit ion, tigh ten with a s crew the PK-5 7

ground cable as illustrated in the gure.

PK-57 : Part No. GPK570010B0

PK-57 change cable : Part No. M90135900A0

Adhesive clamp : Part No. E9607603000

3) Set the memory switches as follows.

Memory switch No. Set value

19 2

20 1

24 1

Ground cable

－51－

－

Remarks

Corrective measure

Turn OFF the power switch and remove the cause

of troubles.

Press the reset switch and check the pattern No.

This error is output when

max. sewing area, 30 x 40

is over. Interference of the

work clamp foot with needle

is not protected.

Check the contents of memory switch No. 201.

Turn the hand pulley to return the needle bar to its

specied position.

Press the reset switch and check the pattern and

X/Y scale rate.

Press the reset switch and check the pattern and

X/Y scale rate.

Turn OFF the power switch and check the data

ROM.

Re-start or return-to-origin after thread trimming by

means of the reset switch (For the details, refer to

the item “How to use the temporary stop”, P.29.)

Refer to the item “Replenishing

Replenish the designated places with grease and

set memory switch No. 245 to “0” with the reset

the designated places with

grease” of MAINTENANCE,

p.37.

Refer to the item “Replenishing

key. Error can be released with the reset key when

immediate replenishing with grease cannot be

performed during sewing operation.

Immediately perform replenishing with grease and

the designated places with

grease” of MAINTENANCE,

p.37.

set memory switch No. 245 to “0” with the reset key.

The sewing machine cannot be operated with the

head tilted.

Return the sewing machine head to its proper

position.

Turn OFF the power switch and check whether

CN14 of SDC circuit board is disconnected or loose.

Turn OFF the power switch and check whether

CN66 of INT circuit board is disconnected or loose.

Turn OFF the power switch and check whether

CN65 of INT circuit board is disconnected or loose.

7. Error list

Description of error

The main shaft of the sewing machine does not

rotate due to some troubles.

Back-uped pattern No. has not been registered in

the data ROM, or it is set to readout inoperative.

Pattern No. is set to “0”.

Needle bar is not in the specied position.

Machine lock error

Pattern No. error

Indication Name of error

Needle bar position error

The sewing area is beyond the limit.

Sewing area over

The sewing pitch is beyond 10 mm.

The pattern data cannot be adopted.

Temporary stop by operating the reset switch while

the sewing machine is running. (Refer to memory

switch No. 31.)

Information as to the time of replenishing t he

designated places with grease

Enlargement error

Pattern data error

Temporary stop

G r e as e r e p l e ni s h i n g t im e

information

Sewing machine has stopped since the time of

Grease replenishing warning error

replenishing the designated places with grease

has come.

Head tilt detection switch is turned ON.

Head tilt error

Detection of the upper dead point of the sewing

machine cannot be performed.

The thread trimmer is not in the proper position.

Th e needl e threa d clamp de vice is not in th e

proper position.

Z phase detection error

Thread trimmer position error

Needle thread c la mp position

error

Remarks

Corrective measure

Turn OFF the power switch and check whether

CN14 is loose or disconnected.

Turn OFF the power switch and check whether

CN14 is loose or disconnected.

Turn OFF the power switch and check whether

Check the cause of blown-

out of the fuse.

coupling of the main motor is loose.

Check the power source voltage.

Turn OFF the power switch and turn ON the power

switch again after some time.

Turn OFF the power switch and check F1 fuse of

SDC circuit board.

Check the cause of blown-

out of the fuse.

Turn OFF the power switch and check F2 fuse of

SDC circuit board.

Turn OFF the power switch and turn ON the power

switch again after some time.

Turn OFF the power switch and check whether

CN62 of INT circuit board or CN42 of MAIN circuit

board is disconnected or loose.

Turn OFF the power switch and check whether

CN63 of INT circuit board or CN43 of MAIN circuit

board is disconnected or loose.

Turn OFF the power switch and check whether

CN64 of INT circuit board or CN44 of MAIN circuit

board is disconnected or loose.

Turn OFF the power switch and check whether

CN65 of INT circuit board or CN45 of MAIN circuit

board is disconnected or loose.

Turn OFF the power switch and check whether

coupling of the main motor is loose.

Description of error

Encoder A or B phase cannot be detected.

Encoder U, V or W phase cannot be detected.

The motor is reversing.

Power source voltage is beyond the specied value.

Encoder trouble A

Encoder trouble B

Reverse rotation of motor

Overvoltage error

Indication Name of error

Power source voltage is short.

Error from the motor driver is detected.

Power source of the stepping motor is not output.

Low voltage error

Motor driver trouble

Stepping motor power source

Power source of the solenoid is not output.

Overheat of SDC circuit board

X origin sensor does not change.

trouble

Solenoid power source trouble

SDC circuit board overheat

X origin retrieval error

Y origin sensor does not change.

Y origin retrieval error

Work clamp foot origin sensor does not change.

Work clamp foot origin retrieval

error

Needle thread clamp origin sensor does not change.

Needle t h r e ad cl a m p or i g in

retrieval error

Timi ng la g bet ween fee d and mai n sha ft has

occurred.

Feed trouble error

－53－

－

Remarks

Corrective measure

Turn OFF the power switch and check whether

CN34 of MAIN circuit board is loose.

Turn OFF the power switch and check whether

CN 32 of MAI N cir cuit board or CN 15 of SD C

circuit board is disconnected or loose.

Turn OFF the power switch and turn ON the power

switch again after some time.

Tu r n O FF th e po w e r sw i t ch an d ch e c k th e

insertion of ROM of U22 of MAIN circuit board.

Turn OFF the power switch and check whether

CN38 of MAIN circuit board is disconnected or loose.

Turn OFF the power switch and check the power

source voltage and check whether CN3 of FLT

circuit board o r CN13 of SDC circuit b oa rd is

disconnected or loose.

Description of error

Communication between the panel and MAIN

cannot be performed.

Communication between MAIN and SDC cannot

Communication error between

panel and MAIN

Communication error between

Indication Name of error

be performed.

Overheat of MAIN circuit board

panel and SDC

MAIN circuit board overheat

Memory write-in of MAIN circuit board cannot be

performed.

Memory write-in of the head circuit board cannot

MAIN memory write-in trouble

INT memory write-in trouble

be performed.

Power source voltage type is different.

The connector is disconnected.

Abnormal power source

Disconnection of connector

(Without indication)

8. Troubles and corrective measures (sewing conditions)

Trouble

1. The needle thread slips off at the start of bar-tacking.

2. T h r e a d o f t e n breaks or synthetic fiber thread splits

nely.

3. The needle often breaks.

4. Thre ads are not trimmed.

(Bobbin thread only)

5. S t i t c h s k i p p i n g often occurs.

Cause

Stitches are slipped at the start.

The needle thread remaining on

the needle after thread trimming is too short.

The bobbin thread is too short.

Needl e t hread tensi on at 1st

stitch is too high.

T h r e a d c l a m p i s u n s t a b l e

(material is apt to be expanded, thread is hard to slide, thread is thick, etc.).

Pitch at 1st stitch is too small.

The sh utt le or th e dri ver h as

scratches.

T h e ne e d l e h o l e gu i d e h a s

scratches.

T he need le s tri k es the work

clamp foot.

Fibrous dust is in the groove of

the shuttle race.

The needle thread tension is too

high.

The tension of the thread take-

up spring is too high.

The synthetic ber thread melts

due to h eat generated on the needle.

The needle is bent.

The needle hits the work clamp

foot.

The needle is t oo thin for t he

material.

The driver excessively bends the

needle.

Needle thread is stepped on by

the work clamp foot at the start of sewing. (Needle bend)

The counter knife is dull.

The difference in level between

the needle hole guide and the counter knife is not enough.

T h e moving k nife h a s be e n

improperly positioned.

The last stitch is skipped.

Bobbin thread tension is too low.

T h e m o t io n s of th e ne ed l e

and shu t tle are not pro perl y synchronized.

T h e clea r a n ce b e t w een t h e

needle and shuttle is too large.

The needle is bent.

The driver excessively bends the

needle.

Corrective measures

Adjust the clearance between the needle

™

and the shuttle to 0.05 to 0.1 mm.

Set s oft-s tart sewin g at th e start of

™

bartacking.

Correct the thread tension release timing

™

of the thread tension controller No. 2.

Increase the tension of the thread take-

™

up spring, or decrease the tension of the thread tension controller No. 1.

Decreas e the tensi on of t he bobbin

™

thread.

Increase the clearance between the

™

needle hole guide and the counter knife.

Decrease the tension at 1st stitch.

™

Decrease the number of rotation at 1st

™

stitch at the sewing start. (Extent of 600 to 1,000 sti/min)

Inc rea se the num ber of st itches of

™

thread clamp to 3 to 4 stitches.

Make the pitch at 1st stitch longer.

™

Decrease the needle thread tension at

™

1st stitch.

Take it out and remove the scratches

™

using a ne whetstone or buff.

Buff or replace it.

™

Correct the position of the work clamp

™

foot.

Take out the shuttle and remove the

™

brous dust from the shuttle race.

Reduce the needle thread tension.

™

Reduce the tension.

™

Use silicone oil.

™

Replace the bent needle.

™

Correct the position of the work clamp

™

foot.

R e p l ac e it w i t h a t h i c k e r needl e

™

according to the material.

Correctly position the needle and the

™

shuttle.

Widen the distance between the needle

™

and the wiper. (23 to 25 mm)

Replace the counter knife.

™

Increase the bend of the counter knife.

™

Correct the position of the moving knife.

™

Correct the timing between the needle

™

and the shuttle.

In crease the bobbin thread tension.

™

Correct the positions of the needle and

™

shuttle.

Correct the positions of the needle and

™

shuttle.

Replace the bent needle.

™

Correctly position the driver.

™

Page

13 33

13 32

－55－

－

Trouble

6. The needle thread comes out on the wrong side of the material.

7. T h rea d s b r e a k at time of thread trimming.

8. The thread clamp is entangled with needle thread.

9. Uneven length of the needle thread

10.

T h e l e n g t h o f

needle thread does not become short.

11.

T h e k n o t t i n g

section of bobbin thread at 2nd stitch at the sewing start a p p e a r s on the right side.

Cause

The needle thread tension is not

high enough.

The tension release mechanism

fails to work properly.

The needle thread after thread

trimming is too long.

Number of stitches is too few.

When sewing length is short (End

of needle thread protrudes on the wrong side of sewing product.)

Number of stitches is too few.

T h e moving k nife h a s be e n

improperly position.

The needle thread at the sewing

start is too long.

The tension of thread take-up

spring is too low.

The tension of thread tension

controller No. 1 is too low.

The tension of thread take-up

spring is too high.

The tension of thread take-up

spring is too low and motion is unstable.

Idling of bobbin is large.

The bobbin thread tension is too

low.

The needle thread tension at 1st

stitch is too high.

Corrective measures

Increase the needle thread tension.

™

Check whether or not the tension disc

™

No. 2 is released during bar-tracking.

I ncr ease the tens ion of the thre ad

™

tension controller No. 1.

Correct the position of the moving knife.

™

Turn OFF the thread clamp.

™

Turn OFF the thread clamp.

™

Use the lower plate, the hole of which

™

is larger than the presser.

Correct the position of the moving knife.

™

Tighten thread tension controller No. 1

™

and make the length of needle thread 33 to 36 mm.

Increase the tension of the thread take-

™

up spring.

Increase the tension of thread tension

™

controller No. 1.

Decrease the tension of thread take-up

™

spring.

Increase the tension of thread take-up

™

spring and lengthen the stroke as well.

Adjust the position of the moving knife.

™

Increase the bobbin thread tension.

™

Decrease the needle thread tension at

™

1st stitch.

Turn OFF the thread clamp.

™

Page

9. Table of the optional parts

Name of Parts

Feed plate blank

t = 1.2

Work clamp foot face plate (asm.)

Type

Without knurl / processed

Sewing area lengthwise 20 X crosswise 40

With knurl / processed

Sewing area lengthwise 20 X crosswise 40

Without knurl / stainless steel

Sewing area lengthwise 20 X crosswise 40

Without knurl / processed

Sewing area lengthwise 30 X crosswise 40

Without knurl / without processing

Sewing area lengthwise 30 X crosswise 40

Without knurl / stainless steel

Sewing area lengthwise 30 X crosswise 40

With knurl / processed

Sewing area lengthwise 30 X crosswise 40

With knurl / without processing

Sewing area lengthwise 30 X crosswise 40

Part No.

14120109

14120307

14120505

40021855

40021856

40021857

40021858

40021859

14121263

Remarks

t = 0.5

Face plate for

presser blank

Presser blank

Needle hole guide

Finger guard (1)

With knurl / Processed (right)

Sewing area lengthwise 20 X crosswise 40

With knurl / Processed (Left)

Sewing area lengthwise 20 X crosswise 40

With knurl / Processed (right)

Sewing area lengthwise 30 X crosswise 40

With knurl / Processed (Left)

t = 3.2

ØB

ØA

Sewing area lengthwise 30 X crosswise 40

With knurl / without processing (right)

Sewing area lengthwise 30 X crosswise 40

With knurl / without processing (Left)

Sewing area lengthwise 30 X crosswise 40

A=1.6 B=2.6 With relief slit

A=1.6 B=2.0 Without relief slit

A=2.3 B=4.0 Without relief slit

A=2.7 B=3.7 Without relief slit

A=56.5 B=64

14121701

14121800

40021851

40021852

40021853

40021854

B2426280000

D2426282C00

14109607

D2426MMCK00

13533104

Standard type

F and M types

H and W types

For extra heavy-

weight material

A=59 B=74

－57－

13548300

For large size

bartacking

－

Name of Parts

Finger guard (2)

Type

A=66.5 B=43

Part No.

13573407

Remarks

For

lengthwise

bartacking

Finger guard (3)

Work clamp foot blan

SM8040302TP

A=21.5 B=35.5

With knurl / processed (right)

With knurl / processed (left)

14120000

40021869

40021870

Fo r s pec ially

ordered wo rk

clamp

. EXPLANATION OF THE LK-1901A, COMPUTER-CONTROLLED

HIGH-SPEED EYELET BUTTONHOLE BARTACKING MACHINE

1. Specications

Different specications from those of the LK-1900A only are described.

1) Sewing speed ..............................................Max. 3,000sti/min

2) Needle ......................................................... DPx5 #14, #16

3) Lifting method of the work clamp foot .......... Stepping motor

4) Lift of the work clamp foot ............................ Max. 17mm

5) Number of standard patterns ....................... 3 patterns

6) Wiper method .............................................. Interlocked with work clamp foot lifter driven by stepping

motor

2. Installation of the sewing machine and preparation of the operation

WARNING :

Be sure to perform the work with two persons or more when moving the sewing machine.

1) Except for the connection of the work clamp foot bracket unit solenoid, installation of LK-1901A and

preparation of the operation are the same as those of the LK-1900A.

Refter to the instruction manual for the LK-1900A.

2) Connect connector CN47 1 of the relay cable of the work clamp foot bracket unit with connector

CN47 2 mounted on the MAIN circuit board inside the control box.

－59－

－

3. Adjustment of the material closing amount

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Graduation

1) The maximum material closing amount is 4 mm. However, the amount is set to 2 mm at the time of

delivery because of the relation of the feed plate window and the work clamp foot (dimension C).

(Graduation position : 2)

2) Loosen bolt 1 and move work clamp foot regulator 2 in the direction of arrow to adjust the material

closing amount. The material closing amount will be dereased when work clamp foot regulator 2 is

moved in the direction of A , and be increased when it is moved in the direction of B .

To increase the material closing amount more than 3 mm, widen the feed plate window

by additional work (increase the dimension C.) so that the feed plate window does not

interfere with the work clamp foot.

4. Adjustment of the lift of the work clamp foot

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Max. 17mm

1) Loosen two setscrews 1 and adjust by moving work clamp foot lifting plate 2 back and forth in the

direction os arrow. The amount of the lift os the work clamp foot will be decreased when work clamp

lifting plate 2 is moved in the direction of A, and be increased when it is moved in the direction of B.

After the adjustment, securely tighten setscrews 1 .

5. Adjustment of the pressure of the work clamp unit

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

1) The pressure of the work clamp unit should be minimized as long as the material does not warp during

sewing. Loosen adjusting screw 1 and turn adjusting screw 2 to obtain the aforementioned pressure.

6. Setting of the material closing operation

1) The material closing operation is performed by the electromagnetic solenoid, and change-over of

the operation setting (effective / ineffective) is available. The material closing has been set to work

simultaneously with sewing at the time of delivery.

2) If the material closing is not performed, the change-over is made by the memory switch. For the way

of operation, refer to item “How to use the memory switch” described in the instruction manual for the

LK-1900A.

List of memory switch functions

◎

No.

Setting range “1” : The material closing simultaneously works when the work clamp foot comes down.

※

Set t i n g of ma t e r i al cl o sin g

operation

Setting range “2” : The material closing simultaneously works with the sewing after the work clamp foot

As for the contents of memory switch function Nos. other than memory switch No. 50, refer to the list of

※

the memory switch functions described in the Instruction Manual for the LK-1900A.

Function

has come down.

Setting range

0 : Ineffective

1 :

Synchronized with work clamp

foot

2 : Synchronized with start

State at time of delivery

－61－

－

7. Selection and conrmation of the sewing patterns

WARNING :

In case of using an exclusive work clamp foot, make sure of the shape of the sewing pattern. If the sewing pattern extends outside the work clamp foot, the needle interferes with the work clamp foot during sewing, resulting in the danger of the needle breakage or the like.

1) The patterns for eyelet buttonhole bartacking are from No. 11 to No. 13.

2) When the material closing operation is performed, the maximum sewing size is 3x7mm. Set the most

appropriate size using the enlargement/reduction function. As for the way of operation for setting,

checking or changing the sewing pattern, refer to the item “Operation of the sewing machine (basic)”

described in the instruction material for the LK-1900A.

After setting, check the needle entry point whether or not the needle interferes with the

work clamp foot.

Pattern No. Number of stitches

Sewing size (mm)

Lengthwise

2.5

Crosswise

Sewing size is the dimension when

the enlargement rate is 100%.

. EXPLANATION OF THE LK-1902A, COMPUTER-CONTROLLED

HIGH-SPEED BELT-LOOP ATTACHING MACHINE

1. Specications

Different specications from those of the LK-1900A only are described.

1) Sewing speed ..............................................Max. 3,000sti/min

2) Needle ......................................................... DPx5 #14, #16

3) Lifting method of the work clamp foot .......... Stepping motor

4) Lift of the work clamp foot ............................ Max. 17mm

5) Number of standard patterns ....................... 6 patterns

6) Wiper method .............................................. Interlocked with work clamp foot lifter driven by stepping

motor

Installation of the sewing machine and preparation of the operation

WARNING :

Be sure to perform the work with two persons or more when moving the sewing machine.

Control box

Operator

WARNING :

Tilt slowly the sewing machine head until it hits against the machine head support bar when tilting the sewing machine head.

3. Threading the machine

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

1) The standard installing position of the belt-loop

attaching machine should be lateral on the table.

2) Install the control box the same as the longitudinal

installation.

3) Use the extension cord packed in the machine

head box to connect the control box with the

machine head.

Thread the machine in the order as illustrated in the

left gure. Leave thread of approximately 4 cm after

passing through the needle.

Fo r a thi ck thr ead, pass the threa d

through only one of the two holes in

needle bar thread guide 1 .

－63－

－

4. Selection and conrmation of the sewing patterns

WARNING :

1) The patterns for the belt-loop attaching are from No. 17 to No. 22.

As for the way of operation for setting, checking or changing the sewing pattern, refer to the item

“Operation of the sewing machine (basic)” described in the instruction manual for the LK-1900A.

After setting, make sure of the needle entry point whether or not the needle interferes with

the work clamp foot.

* The calling has been set to ineffective at the time of delivery since the needle interferes with the

standard work clamp foot which has been provided with the machine. When using this function, use

“Setting the pattern data calling effective or ineffective” of the memory switch function to make the

calling effective. As for the way of operation for setting, refer to the item “How to use the memory

switch” described in the instruction manual for the LK-1900A.

Pattern No.

※

Sewing size (mm)

Lengthwise

Crosswise

Number of stitches

Sewing size is the dimension when

the enlargement rate is 100%.

5. Combination of the work clamp foot and the feed plate

WARNING :

Make use of the appropriate combination of the work clamp foot and the feed plate in accordance with the sewing

conditions. The combination for the standard delivery and the special order is shown in the following table.

Work clamp footSpec

Part No.

14143002

24.8

LK-1902A

Standard

Feed plate

Part No.

13544465

For large size

(Special order part)

For extra large size (Special order part)

2.4

Part No.

13545660

Part No.

13547161

27.4

37.4

2.8

Part No.

13545504

Part No.

13545801

Part No.

13547005

. EXPLANATION OF THE LK-1903A, COMPUTER-CONTROLLED

HIGH-SPEED LOCKSTITCH BUTTON SEWING MACHINE

1. Specications

Different specications from those of the LK-1900A only are described.

1) Sewing speed ..............................................Max. 2,700sti/min

2) Needle ......................................................... DPx17 #14

3) Lifting method of the work clamp foot .......... Stepping motor

4) Lift of the work clamp foot ............................ Max. 13mm

5) Number of standard patterns ....................... 50 patterns

6) Wiper method .............................................. Interlocked with work clamp foot lifter driven by stepping

motor

* The needle thread clamp device is set to prohibition (state of standard delivery) with memory

switch No. 35. Refer to 6. Thread clamp device of [5] OPERATION OF THE SEWING MACHINE

(BASIC).

2. Installation of the sewing machine and preparation of the operation

WARNING :

Be sure to perform the work with two persons or more when moving the sewing machine.

1) Installation of the sewing machine head and the

Set of button tray base

control box is the same as that of the LK-1900A.

Refer to the instruction manual for the LK-1900A.

2) Install a set of the button tray base to a convenient

place for the work as the set is included in the

accessories.

3) The way of operation is the same as that of the

LK-1900A.

Make sure before operation that the

nee dle does not stri ke a gain st t he

button hole.

3. Needle and thread

Needle Needle thread

#60

DPx17 #14

#60

#50

#40

Bobbin thread

#80

#60

Needle and thread will vary in accordance with the

sewing conditions. When using the needle and the

thread, select them referring to the left table. Cotton

thread and polyester spun thread are recommended.

－65－

－

4. Various sewing modes

(1) List of sewing patterns

Number of threads and standard sewing size of X and Y are as shown in the following list.

< Sewing program list >

Pattern

No.

1 • 34

2 • 35

5 • 36

6 • 37

Stitch

shape

Number

of threads

(thread)

6-6

8-8

10-10

12-12

6-6

8-8

10-10

12-12

Standard

sewing size X

(mm)

Standard

sewing size Y

(mm)

Pattern

No.

18 • 44

19 • 45

23 • 46

Stitch

shape

Number

of threads

(thread)

Standard

sewing size X

(mm)

3.4

Standard

sewing size Y

(mm)

3.4

9 • 38

10 • 39

12 • 40

13 • 41

15 • 42

16 • 43

6-6

8-8

10-10

6-6

8-8

10-10

6-6

8-8

10-10

3.4

26 • 47

28 • 48

30 • 49

32 • 50

6-6

10-10

6-6

10-10

5-5-5

8-8-8

5-5-5

8-8-8

3.4

3.0

3.4

2.5

* The standard sewing sizes of X and Y are when the enlargement / reduction rate is 100%.

Use the pattern No. 34 to No.50 when the button hole is small (ø1.5 mm or less).

(2) Selection of the sewing pattern and the sewing width

Selection of the sewing pattern is the same as that of the LK-1900A.

™

When the distance between holes of the button used does not t the standard sewing width of the

™

sewing pattern No., adjust the sewing width by enlarging/reducing the sewing width.

The way of enlarging/reducing is the same as that of the LK-1900A. Refer to the table given below for

the scale for enlargement/reduction in terms of the sewing width.

After changing the sewing pattern No. and the sewing width, make sure of the needle entry point.

™

As for the way of conrmation, refer to the conrmation of the shape of sewing pattern in the instruction

manual for the LK-1900A.

Table of XY scale in terms of the sewing width

◎

X•Y

2.4 2.6 2.8 3.0 3.2 3.4 3.6 4.0 4.3 4.5 4.7 5.2 5.6 6.0 6.2 6.4

(mm)

% 71 76 82 88 94 100 106 118 126 132 138 153 165 176 182 188

5. Position of the button clamp jaw lever

WARNING :

When change of the shape of button, change of the sewing pattern or enlargement/reduction of the sewing width is performed, make sure the needle entry point. If the needle extends outside the button hole or the sewing pattern extends outside the button clamp unit, the needle interferes with the button hole or the button clamp unit, resulting in the danger of the needle breakage or the like.

Needle entry point

Button

Hole in the button

1) Press key in the state that the swing LED goes off using the operation panel.

2) Press key.

3) Press key. The button clamp unit goes to the origin position and goes up.

4) Place a button in button clamp jaw levers 1 .

5) Depress the pedal to the first step and detach

your foot from the pedal when the button clamp

unit comes down.

6) Turn the hand pulley and check that the center of

the needle enters the center of the button.

If the center of the needle is not located in the

center of the button, loosen screws 2 in the button

clamp jaw lever base to adjust so that the center of

the needle enters the center of the button.

8) When depressing the pedal to the second step

at step 5), the button clamp unit moves again to

the origin position. In addition, when the button

clamp unit comes down, depress the pedal to

the rst step and detach the foot from the pedal.

Then the button clamp unit goes up.

9) After the adjustment, perform the conrmation of

the pattern shape and make sure that the needle

surely has entered the button hole.

－67－

－

6. Adjusting the feed plate

WARNING :

When change of the shape of the button, change of the sewing pattern or enlargement/reduction of the sewing width is performed, make sure of the shape of the sewing pattern. If the feed plate interferes with the needle hole guide, it will result in the danger of the needle breakage or the like. Also, if the pedal is depressed during the adjustment, the button clamp unit will go up or come down. So, be careful.

1) Press key in the state that the swing LED goes off using the operation panel.

7. Adjusting the button clamp jaw lever

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

0.5mm to 1mm

2) Press key.

3) Press key. The button clamp unit goes to the origin position and goes up.

4) Adjust feed plate 1 so that needle hole guide 2

comes to the center of the recessed part of feed

plate 1 .

Bring the machine to its stop-motion state. Then

lift button clamp 1 . Loosen screw 2 in the button

clamp jaw lever and adjust so that a clearance of

0.5 to 1 mm is provided between button clamp jaw

lever 3 and hinge screw 4 when placing a button in

between button clamps 1 . Then tighten screw 2 in

the button clamp jaw lever.

8. Adjusting the lifting amount of the button clamp

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Max. 13mm

Loosen two setscrews 1 , and move moving plate 2 back and forth in the direction of arrow to adjust. The

lifting amount of the button clamp will be decreased when moving plate 2 is moved in the direction of A , and

be increased when it is moved in the direction of B . After the adjustment, securely tighten setscrews 1 .

9. Adjustment of the pressure of the work clamp unit

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

The pressure of the work clamp unit should be minimized as long as the material does not warp during

sewing. Loosen adjusting screw 1 and turn adjusting screw 2 to obtain the aforementioned pressure.

－69－

－

10. Adjustment of the wiper spring

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Wi per sprin g 1 ret ains the needl e thread after

thread trimming in between wiper 2 and the wiper

spring. Correct properly the tension of wiper spring

so that the tension at that time becomes 0.2 to

0.3N (a little higher tension than that of the bobbin

thread coming out of the bobbin case).

If the retaining of the needle thread is

excessive, the thread may protrude

from the upper side of the button.

11. Installing the save button bar (accessory part)

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

1) Install save button bar 3 on button clamp base

with hexagon screw 2.

2) Adju st so that a clearance of 3.5 to 4 mm is

provided between the center of the button and

the top end of the save button bar.

3) To adjust the raising amount of the save button

bar, loosen screw 4 , and move the save button

bar up or down.

3.5 to 4mm

12. Model classication according to the button size

Model

Button size classication

Outside diameter of applicable buttons (mm)

Sewing size (mm)

Button clamp jaw lever

Right

Left

Needle hole guide

Feed plate

Length

Width

Thickness (mm)

Part No.

LK-1903A-301

For small-sized buttons

ø10 to ø20

0 to 3.5

2.2 (2.7)

MAZ155070B0 B

(MAZ156070B0) C

MAZ155080B0 B

(MAZ156080B0) C

MAZ15501000

MAZ15502000

※

LK-1903A-302

For medium-sized button

ø10 to ø20

0 to 4.5

2.7 (2.2)

MAZ156070B0 C

(MAZ155070B0) B

MAZ156080B0 C

(MAZ155080B0) B

MAZ15601000

MAZ15602000

※

The part in parentheses are those to be specially orderd.

Engraved marker

※

－71－

－

13. Attaching the shank botton (optional)

(1) Specications

Model

Needle

Shape of button

Optional

TQx3 #14

Outside diameter

Diameter of hole

Position of hole

Shape of shank section

Max. ø20

Min. ø1.5

1.5 mm or more

Minimum

–

(mm)

Maximum

Sewing speed

Stitch shape

As for the dimensions of the shape of shank section,

reder to the above table for reference.

Max. speed of the pattern data is limited to 2,700 sti/min. However, set it to 1,500

sti/min for the shank button.

Sewing pattern program No.18 to No.22

(Refer to the sewing program list on page 66.)

(2) Adjusting the height of the needle bar

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

4.3mm

1) Loosen needle bar connection screw 1 and move the needle bar 2 up or down so that second

engraved marker line A as counted from the bottom is aligned with the bottom end of needlebar

bushing 3 when turning the hand pulley to bring the needle bar to its lowest position. Then further

raise only the needle bar by 4.3mm, and tighten needle bar connection screw 1 .

2) Attach the needle (TQx3 #14).

(3) Adjusting the feed plate base

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Center

Adjust so that the slot of feed plate 1 becomes the center of the boss section of the needle hole guide,

and tighten setscrew 2 .

When the sewing state between the button and the material is loose, replace feed plate 1

with the feed plate B to obtain a stronger sewing state. At this time, however, the outside

diameter of the button is limited to max. ø19. So, be careful.

－73－

－

(4) Adjusting the button clamp support

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

(5) Checking the needle entry point

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Second

stitch

Loosen setscrew 1 , and place the button to be used

in between the button clamps. Then determine the

longitudinal position of the button hole and the slot of

button clamp base 4 by moving button clamp support,

front 2 and rear 3 back and forth. Then securely tighten

the setscrew. At this time, if the clearance between

button clamp support, front 2 and rear 3 is a little

smaller (approx. 0.5mm) than the outside diameter of the

button to be placed, the button is securely clamped.

Allow the needle to come as near as

the left side of the button hole without

striking the button hole.

When checking the shape of the sewing pattern, t the second stitch of the needle entry to the button hole, and tighten

screw 1 . (Refer to the item of checking the shape of the sewing pattern in the instruction manual for the LK-1900A.)

(6) Adjusting the button clamp base and the feed plate

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

As for the attaching height of button clamp base 1 , adjust the vertical position so that the bottom face of the button

clamp base and the top face (knurl face) of feed plate A 2 can equally press the material. Then tighten setscrew 3 .

2) Adjust the position X (protrusion of the material), position of feed plate A 2 against button clamp base 1,

according to the thickness of the material using setscrew 4 . The standard adjustment value is 0.5 mm.

0.5mm

(7) Adjusting the button support rubber

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

(8) Adjusting the button support link

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

To adjust the position of button support rubber asm.

, loosen setscrews 2 and 3 , and adjust so that

the pressing section of the button support rubber can

press the center of the button at right angles to the

button. Then tighten the setscrews.

Long slit

Loosen screw 1 , and move button support link 2 in the direction A to make early the opening of the

button support rubber when button clamp attaching base 3 goes up. Move it in the direction B to retard

the opening of the button support rubber. The standard adjustment is to adjust so that the button support

rubber starts opening when button clamp attaching base 3 has gone up by 1 mm.

－75－

5. DRAWING OF THE TABLE

290

±0.5

637

199

810

513

1046

1130

1200

148

133.5

115

50270

256

488

411

175.6

158.8.

30.5

ø26

ø8.5 ø8.5

ø36

ø16

110

418.6

360

570

390

306

139.5

120

257

263.5

48.7

158

283

371

±0.5

500

75.5

±0.5

151

±0.5

259.8

□8

□81

R30

4-R10

R30

R10

R30

R10

ø30

(1) Longitudinal installation type table (Part No. 40006886)

q 4- drilled hole 2, 10 deep on the rear side (Stand installing hole) w Drawer stopper installing position One place on the rear side e JUKI logotype r 4- drilled hole 8 t Drilled hole 30, 51 spot face 16 deep y Oil drain funnel installing hole u 3- drilled hole 7, 6 deep

Z-Z Y-Y

i Drilled hole 8 o Drilled hole 9, 20 spot face 17 deep !0 2- drilled hole 2, 10 deep on the rear side (Power switch installing hole) !1 Drilled hole 17 !2 Drilled hole 28 !3 R2 (all corners) !4 Right side

− 76 −

(2) Lateral installation type table (Part No. 40006887)

R30

637

824

38297

1130

1200

151±0.5

290

±0.5

42936.5

R30

±0.5

75.5

263.5

570

547

390

360

110

R30

148

158.8

18.5

48.7

199

657.5

810

1046

ø38

120

259.8

257

30.5

175.6

4-R10

197

155 133.5

R30

500

±0.5

456

283

Z-Z Y-Y (x2)

ø26

□8

ø36

q 4- drilled hole 2, 10 deep on the rear

side (Stand installing hole)

w Drawer stopper installing position

One place on the rear side

e JUKI logotype r Drilled hole 8 t Drilled hole 9, 20 spot face 17 deep y 4- drilled hole 8 u Drilled hole 30, 51 spot face 16 deep

i Oil drain funnel installing hole o 3- drilled hole 7, 6 deep !0 Drilled hole 17 !1 Drilled hole 28 !2 2- drilled hole 2, 10 deep on the rear

side (Power switch installing hole)

!3 R2 (all corners) !4 Right side

ø8.5

ø16

− 77 −

Contents

JUKI LK-1903A-305, LK-1903A, LK-1902A, LK-1901A, LK-1900A Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

CONTENTS

[1] SPECIFICATIONS

[2] CONFIGURATION

1. Names of main unit

2. Names and explanation of switches on the operation panel

[3] INSTALLATION

1. Installing the electrical box

2. Attaching the connecting rod

3. Installing the head support rod

4. Installing and connecting the power switch

5. Installation of the sewing machine head

6. Installing the drain receiver and the head support rubber

7. Safety switch

8. Tilting the sewing machine head

9. Installing the operation panel

10. Connecting the cord

11. Installing the motor cover

12. Managing the cord

13. Installing the eye protection cover

14. Installing the thread stand

[4] OPERATION OF THE SEWING MACHINE

1. Lubrication

2. Attaching the needle

3. Threading the machine head

4. Installing and removing the bobbin case

5. Installing the bobbin

6. Adjusting the thread tension

7. Adjusting the thread take-up spring

8. Example of the thread tension

[5] OPERATION OF THE SEWING MACHINE (BASIC)

1. Item data setting

2. Checking the contour of a sewing pattern

3. Sewing

4. Change to the other sewing pattern

5. Winding a bobbin

6. Thread clamp device

[6] OPERATION OF THE SEWING MACHINE (ADVANCED)

1. Performing sewing using the pattern keys ( , , , and )

2. Performing sewing using the combination function

3. Performing sewing using the “bobbin thread counter”

4. How to use the temporary stop

5. Setting the pattern thread tension

6. Cautions in operation

[7] MAINTENANCE

1. Adjusting the height of the needle bar

2. Adjusting the needle-to-shuttle relation

3. Adjusting the lift of the work clamp foot

4. The moving knife and counter knife

5. Needle thread clamp device

6. Adjustment of the wiper

7. Draining waste oil

8. Amount of oil supplied to the hook

9. Replacing the fuse

10. Changing the voltage of 100/200V

11. Replenishing the designated places with grease

[8] HOW TO USE THE MEMORY SWITCH

1. Start and change of the memory switch

2. Example of the memory switch setting

3. Table of functions of the memory switch

[9] OTHERS

1. Setting the DIP switch

3. Table of the standard patterns

4. Table of the work clamp foot

5. LK-1900 data ROM

6. Connection of the optional pedal

7. Error list

8. Troubles and corrective measures (sewing conditions)

9. Table of the optional parts

2. Installation of the sewing machine and preparation of the operation

3. Adjustment of the material closing amount

4. Adjustment of the lift of the work clamp foot

5. Adjustment of the pressure of the work clamp unit

6. Setting of the material closing operation

Installation of the sewing machine and preparation of the operation

3. Threading the machine

5. Combination of the work clamp foot and the feed plate