JUKI LK-1900C Series Instruction Manual
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JUKI LK-1900C Series Instruction Manual

JUKI LK-1900C Series Instruction Manual

Computer-controlled high-speed bartacking machine
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LK-1900C Series
INSTRUCTION MANUAL
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Summary of Contents for JUKI LK-1900C Series

  • Page 1 LK-1900C Series INSTRUCTION MANUAL...

  • Page 2: Table Of Contents

    CONTENTS I. EXPLANATION OF THE LK- 6-5. Setting the pattern thread tension ....44 6-6. Copying or deleting various kinds of 1900C, COMPUTER-CON- pattern data ............45 TROLLED HIGH-SPEED BART- 6-7. Communication ..........49 ACKING MACHINE ......1 6-8. Correction of tension (bobbin thread 1.
  • Page 3 III. EXPLANATION OF THE LK- 2-7. Fixing the finger guard ........122 2-8. Needle and thread ......... 122 1902C, COMPUTER-CON- 2-9. Various sewing modes ........123 TROLLED HIGH-SPEED BELT- 3. ADJUSTMENT OF THE SEWING LOOP ATTACHING MACHINE ..103 MACHINE ............124 1.

  • Page 4: Explanation Of The Lk-1900C, Computer- Controlled High-Speed Bartacking Machine

    I. EXPLANATION OF THE LK-1900C, COMPUTER- CONTROLLED HIGH-SPEED BARTACKING MACHINE 1. SPECIFICATIONS 1 Sewing area X (lateral) direction 40 mm Y (longitudinal) direction 30 mm 3,300 sti/min 2 Max. sewing speed (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...

  • Page 5: Configuration

    2. CONFIGURATION 2-1. Names of main unit ❸ ❶ ❻ ❹ ❺ ❷ ❼ ❽ ❶ Machine head ❷ Work clamp feet ❸ Thread stand ❹ Operation panel ❺ Power switch ❻ Control box ❼ Pedal ❽ Power switch (Three-phase type) －...

  • Page 6: Names And Explanation Of Switches On The Operation Panel

    2-2. Names and explanation of switches on the operation panel ❶ ❽ ❻ ❾ ❼ ❷ ❸ ❹ ❺ NAME FUNCTION NAME FUNCTION ❽ EDIT key ❶ LCD display Various data such as pattern This key is used to display the No., shape, etc.

  • Page 7: Installation

    3. INSTALLATION 3-1. Installing the pedal sensor Install the pedal sensor ❶ to the table with mounting screws ❷ supplied with the unit. ❷ ❶ 3-2. Attaching the connecting rod B of ped- 1) Fix connecting rod ❶ to installing hole al lever ❷...

  • Page 8: Installing The Head Support Rod

    3-3. Installing the head support rod Drive head support rod ❶ in hole ❷ in the machine table. ❶ ❷ 3-4. Installing and connecting the power switch (1) Installing the power switch For the 3-phase power supply type, a power switch ❸...
  • Page 9 (2) Connecting the power source cord Voltage specifications at the time of delivery from the factry are indicated on the voltage indication seal. Con- nect the cord in accordance with the specifications. Power indication tag Never use under the wrong voltage and phase.

  • Page 10: Installing The Reactor Box (Only For The Ce Type)

    3-5. Installing the reactor box (only for the CE type) Mount the terminals of power source cord ❷ ❹ ❶ to reactor box PCB asm. ❷ and reactor box mounting plate ❸ . Secure the brown cord A to the first and ❶...

  • Page 11: Installing The Filter Box (Only For The 3-Phase Type)

    3-6. Installing the filter box (only for the 3-phase type) Attach the terminals of power source cord ❹ ❶ of the electrical control unit to FLT-T ❷ PCB asm. ❷ and filter box mounting plate ❸ . Secure the black cord to "1", white cord to ❻...

  • Page 12: How To Carry The Sewing Machine

    3-7. How to carry the sewing machine To carry the sewing machine, it is necessary to hold A section and support the side faces of the sewing ma- chine by hand as illustrated in the figure. 1. Carefully prevent slippage of your hand that holds the cover. 2.

  • Page 13: Installing The Drain Receiver And The Head Support Rubber

    3-9. Installing the drain receiver and the head support rubber 1) Fix drain receiver ❷ in the installing hole of table ❸ ❶ with two setscrews ❸ . 2) Screw poly-oiler ❹ in waste oil reservoir ❷ . ❷ 3) Insert sewing-machine waste oil pipe ❺ into po- ly-oiler ❹...

  • Page 14: Installing The Operation Panel And Cable Wiring

    3-10. Installing the operation panel and cable wiring ❷ ❶ 1) Remove two screws ❶ . 2) Inserting a screwdriver or the like, remove lid ❷ . 3) Holding the cable so that its claw faces toward Panel connector you, insert the cable into the panel connector. －...

  • Page 15: Installing The Operation Panel

    3-11. Installing the operation panel Secure panel ❶ to panel mounting plate ❹ with two M4 screws ❷ . Then, install them to the arm with M5 screws ❸ . ❶ Attach cable clip ❺ to the panel cable. Then, secure the cable on panel mounting plate ❹...

  • Page 16: Installing The Eye Protection Cover

    3-12. 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 ❶ after installing ❸ it on installing section ❸ with screws ❷ . ❷...

  • Page 17: In The Case The Machine Is Transported After Factory-Completed At The Time Of Shipment

    3-14. In the case the machine is transported after factory-completed at the time of shipment ❷ ❷ ❺ ❶ ❹ ❸ Pass bed fixing bolt ❸ , plain washer ❹ and nut ❺ through hole ❶ in the table and hole ❷ in the sewing machine bed to fix the bed on the table.

  • Page 18: Operation Of The Sewing Machine

    4. OPERATION OF THE SEWING MACHINE 4-1. Lubrication 1) Remove top cover screws ❶ (six pieces). ❶ 2) Remove lubrication rubber plug ❷ and supply oil. ❷ Two bottles of oil, 100 ml x 2, come with the sew- ing machine. Supply one and a half bottle of oil. Appropriate amount of oil is 150 ml.

  • Page 19: Attaching The Needle

    4-2. 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 ❶ and hold needle ❷ with the long groove ❸ facing toward you. Then fully insert it into ❶...

  • Page 20: Installing And Removing The Bobbin Case

    4-4. 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 ❶ . ❸ 2) Raise latch ❸ of bobbin case ❷ , and remove the bobbin case.

  • Page 21: Adjusting The Thread Take-Up Spring

    Adjusting the needle thread tension ❸ to dis- 1) Press THREAD TENSION key play the thread tension input screen. 2) Set a needle thread tension with DATA CHANGE ❹ The setting range is 0 to 200. In- creasing the value increases the thread tension. * The sewing machine with standard specifications has been factory-set at 50 (the tension: 1.5 N ❹...

  • Page 22: Operation Of The Sewing Machine (Basic)

    5. OPERATION OF THE SEWING MACHINE (BASIC) Set each item following the procedure described below. 5-1. Selection of language When you turn ON the power to the sewing machine for the first time after the purchase, the language selection screen is displayed. Select the language to be dis- ❾...

  • Page 23: Setting The Item Data

    5-3. Setting the item data ❽ , the item data input screen is displayed. When you press EDIT key The items that can be edited are displayed on the left section of the screen and the set contents are dis- played on the right section of the screen.
  • Page 24 (3) Inputting the sewing speed ❻ to display the C004 Press ITEM SELECT key sewing speed. ❼ to display the val- Press DATA CHANGE key ue you desire. The maximum input range is the maximum sewing speed of the memory switch U001. ❻...
  • Page 25 (5) Setting the thread tension  to display Press THREAD TENSION key the C003 thread tension. ❼ to display the Press DATA CHANGE key value you desire. (Input range: 0 - 200) After setting the sewing data, press RETURN key ❾...

  • Page 26: Checking The Contour Of A Sewing Pattern

    5-4. Checking the contour of a sewing pattern WARNING : 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.

  • Page 27: Sewing

    ❷ Clearance ❸ ❶ Clearance ❶ Needle ❷ ❹ When using a sewing pattern which is full in lengthwise direction (+10 mm), make sure of the clearance between cloth feed base ❷ and wiper base ❶ . If there is no clearance, loosen setscrew ❸...

  • Page 28: Winding A Bobbin

    5-7. Winding a bobbin (1) To wind a bobbin while the sewing machine is performing sewing Thread the bobbin winder and wind the bobbin thread onto the bobbin as illustrated in the figure. (2) For winding a bobbin only ❷ to turn off SET READY 1) Press READY key LED  .

  • Page 29: Thread Clamp Device

    5-8. 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.
  • Page 30 (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.

  • Page 31: Led Hand Light

    5-9. LED hand light WARNING : In order to protect against personal injury due to unexpected start of the sewing machine, never bring hands near the needle entry area or place foot on the pedal during the adjustment of intensity of the LED.

  • Page 32: How To Adjust The Marking Light (Lk1900Cs/Cf/Ch/Cw/Cbs, Lk1901C)

    5-10. How to adjust the marking light (LK1900CS/CF/CH/CW/CBS, LK1901C) WARNING : To protect against possible personal injury due to abrupt startup of the machine, be sure to set "U077 Marking light setting" to "Always ON" before carrying out adjustment of the marking light. After setting the U077, press the READY key once to light up the marking light.
  • Page 33 1. Do not excessively tighten setscrew ❶ of the LED holder. 2. If the LED holder is put excessively deep into the lens holder, the inner slit may be damaged when you move the right and left adjustment shafts. Direction of rotation 3.

  • Page 34: Operation Of The Sewing Machine (Advanced)

    6. OPERATION OF THE SEWING MACHINE (ADVANCED) 6-1. Performing sewing using the pattern keys Patterns (No.1 to 999) 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 pat- terns (No.1 to ), P1 to P25 are used by the selection by scrolling the pattern Nos.
  • Page 35 (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 MODE key ❹...
  • Page 36 ❽ . Edit the item data with 3) Press EDIT key ❼ . DATA CHANGE key The item data that can be edited are as de- scribed in "(2) Listing of item data" p.35 ". ❽ ❻ ❼ ❷ ❹ 4) Respectively set the X reduction ratio to "50"...
  • Page 37 ❾ , key to finalize the 7) Press READY key setting. ❾ － －...
  • Page 38 (2) Listing of item data Picto- Item name Input range Remarks: graph X enlargement/ S003 When inputting in terms of per- Input method (percentage or actu- reduction scale/ centage (%): 20 - 200 % al dimension) can be selected by actual dimen- When inputting an actual di- setting the memory switch U064.
  • Page 39 (3) 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 direct pattern 3) Press READY key to light up SET READY LED .

  • Page 40: Sewing Using The Combination Function (Cycle Sewing)

    6-2. Sewing using the combination function (cycle sewing) This sewing machine can perform sewing of plural sewing pattern data in one cycle in the order of the data. As many as 99 patterns can be input. Use this function for sewing two or more different patterns on the sewing product.
  • Page 41 (2) Method of editing cycle data 1) Set the mode to input mode. Under the input mode where SET READY LED  goes out, entry of the cycle data is enabled. If the current mode is the sewing mode, press ❷...
  • Page 42 (3) Sewing operation 1) Turn the power ON. 2) Select the cycle pattern using ITEM SELECT key ❻ . Select the cycle pattern number with DATA ❼ . CHANGE key ❻ ❼ ❷ to light up SET READY 3) Press READY key LED  .

  • Page 43: Sewing Through The Use Of The Counter

    6-3. Sewing through the use of the counter (1) Setting procedure of the counter value 1) Call counter setting screen. ❹ , in the state where Press MODE key SET READY LED  goes out, to display the mode screen. Place "02 Counter setting"...
  • Page 44 (2) Kind of counter ① Sewing counte 1. Sewing UP counter Every time the sewing of one shape is performed, the existing value is counted up. When the existing value is equal to the set value, count-up screen is displayed. 2.
  • Page 45 (4) How to check the counter in the ready state 1) Under the sewing mode where SET READY LED  lights up, press ITEM SELECT key ❻ to dis- play each counter screen. Only the valid counters are displayed. ❻ 2) On the counter screen, the current value of each counter can be updated with DATA CHANGE key ❼...

  • Page 46: How To Use The Temporary Stop

    6-4. How to use the temporary stop Once the RESET key function is set to the "pause" by means of the memory switch U031, the RESET key will function as the pause key to allow the sewing machine to be stopped during sewing. (Refer to "I.8-1.

  • Page 47: Setting The Pattern Thread Tension

    6-5. 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. For the user pattern, the needle thread tension can be individually set as desired.

  • Page 48: Copying Or Deleting Various Kinds Of Pattern Data

    6-6. Copying or deleting various kinds of pattern data Data of pattern No. which has been already registered can be copied to pattern No. which has not been used. Overwriting copy of the pattern is prohibited. When you desire to overwrite, perform it after erasing the pattern once.
  • Page 49 5) Select pattern No. of copy destination. ❼ to select the Press DATA CHANGE key pattern number to be copied. From among the pattern numbers 101 to 999, only the pattern number that has not been used can be selected. 6) Start copying.
  • Page 50 (2) Erasing the pattern 1) Select pattern deletion function If you want to erase a pattern, select the Pattern delete on the management menu screen. ❽ . Press EDIT key ❽ 2) Select erasing pattern ❻ to select the pat- Press ITEM SELECT key tern number you want to delete.
  • Page 51 The pattern key and the cycle pattern can be copied in the similar procedure. To create a new cycle pat- ❻ to select new tern, press ITEM SELECT key creation ❻ To select a copied user pattern, press ITEM SE- ❻...

  • Page 52: Communication

    • When the storage space of a USB device is partitioned, only one partition is accessible. • Some type of the USB device may not be properly recognized by this sewing machine. • JUKI does not compensate for loss of data stored on the USB device caused by using it with this sewing ma- chine.
  • Page 53 Data on needle entry points created with VD00 XXX .VDT Vector form data the PM-1. The data form is commonly used (XXX:001 to 999) among JUKI sewing machine.(User pattern) LK-specific sewing data form created with the Parameter data LK00XXX.EPD sewing machine Cycle pattern data LK00XXX.CSD...
  • Page 54 4) Selecting the number. ❻ to select file No. Press ITEM SELECT key A to be read. ❼ to select file Press DATA CHANGE key No. B to be written. ❷ to write the data in Press set READY key ❻...
  • Page 55 (such as tablet and smartphone) on which JUKI application for Android "JUKI Smart App" has been installed, by means of the NFC communication function. Refer to the Instruction Manual for JUKI Smart App for details of JUKI application for Android "JUKI Smart App". ❶...

  • Page 56: Correction Of Tension (Bobbin Thread Remaining Amount)

    6-8. Correction of tension (bobbin thread remaining amount) The needle thread tension can be corrected in accordance with the remaining amount of the bobbin thread. The remaining amount of the bobbin thread is calculated using the current value and set value of the bobbin thread counter.
  • Page 57 5) Setting the last correction amount ❻ to select "U082 Press ITEM SELECT key Last correction amount". With this set value, the correction ratio of the needle thread tension is determined. ❾ to determine the input Press RETURN key ❻ ❾...

  • Page 58: Cautions In Operation

    6-9. Cautions in operation (1) When the error indicator lamp lights up, be sure to check the cause of trouble and take a proper correc- tive measure. (2) Do not draw, by hand, the material being sewn during sewing. Doing so will cause the needle shift from the correct position.

  • Page 59: Setting Enable/Disable Of Standard Pattern Invoking

    6-10. Setting enable/disable of standard pattern invoking Invoking of a wrong pattern is prevented by disabling invoking of unnecessary patterns. In addition, necessary patterns can be invoked and used. Example of setting: Invoking of pattern No. 2 is dis- abled. 1) Putting the sewing machine in the input mode Under the input mode where the SET READY LED  goes out, setting of data is enabled.

  • Page 60: Setting The Irregular Work

    The data on the input work description can be collected and displayed by means of "JUKI Smart App". Setting of irregular work should be carried by means of "JUKI Smart App". The set details can be checked on the operation panel.
  • Page 61 ③ Displaying the "irregular work setting function" Work items that are displayed on the irregular work input screen are displayed. Carry out setting of work items by means of "JUKI Smart App". ❻ on the "Irregular 1. Press ITEM SELECT key work items setting screen".

  • Page 62: Maintenance

    7. MAINTENANCE 7-1. 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. 1) Open the frame cover. 2） Bring needle bar ❶ to the lowest position of its stroke.

  • Page 63: Adjusting The Needle-To-Shuttle Relation

    7-2. 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. 1) Turn the handwheel by hand. When needle bar Relation between needle and engraved lines ❶...

  • Page 64: Adjusting The Lift Of The Work Clamp Foot

    7-3. 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. 1) With the machine in stop mode, remove six set- ❹...

  • Page 65: Needle Thread Clamp Device

    7-5. 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. ❶ ❶ When thread is caught at top end of the thread clamp, thread clamp becomes incomplete and sewing trou- ble at the sewing start will be caused.

  • Page 66: Draining Waste Oil

    7-7. Draining waste oil When polyethylene oiler ❶ becomes filled with oil, remove polyethylene oiler ❶ and drain the oil. ❶ 7-8. Amount of oil supplied to the hook 1) Loosen setscrew ❶ and remove setscrew ❶ . 2) When screwing in adjustment screw ❷ , the amount of oil of oil pipe, left ❹...

  • Page 67: Replenishing The Designated Places With Grease

    7-9. Replenishing the designated places with grease When the sewing machine has been used for a cer- tain 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 oper- ator of the time of replenishing the designated places with grease.

  • Page 68: Cleaning The Frame

    7-10. Cleaning the frame Periodically clean the inside of the frame to eliminate dust. Frame cover 7-11. Applying grease to the needle bar bushing WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

  • Page 69: How To Use The Memory Switch

    8. HOW TO USE THE MEMORY SWITCH 8-1. Method of changing memory switch data 1) Set the mode to input mode. Under the input mode where SET READY LED  goes out, change to the memory switch data is enabled. If the current mode is the sewing mode, press ❷...

  • Page 70: List Of The Memory Switch Functions

    8-2. List of the memory switch functions Various operations of the sewing machine can be set by programming the memory switch. The initial setting values at the time of shipment differ with models. Function Setting range State when delivered Remarks U001 Max.
  • Page 71 Function Setting range State when delivered Remarks U024 Optional pedal 1 operation : OFF when depressing pedal again : OFF when detaching from pedal U025 Optional pedal 2 operation : OFF when depressing pedal again : OFF when detaching from pedal U026 Height of work clamp foot at the time of 2-step 50 to 90...
  • Page 72 Function Setting range State when delivered Remarks U041 State of work clamp foot when machine stopped by temporary stop command can be selected. : Work clamp foot goes up. : Work clamp foot goes up with work clamp foot switch. : Lift of work clamp foot is prohibited.
  • Page 73 Function Setting range State when delivered Remarks U071 Selection of enable/disable of the thread breakage detection : Enable : Disable Number of stitches to disable thread breakage de- U072 0 to 15 8 (stitches) tection at the beginning of sewing (stitches) U073 Number of stitches to disable thread breakage detection on...
  • Page 74 Function Setting range State when delivered Remarks U084 Movable eye protection cover : Disable : Enable U085 Thread tension for the last stitch 0 to 200 U086 Thread waste suction actuation time LK-1900CB : LK-1900CB :110 110 to 1000 LK-1903CB :140 Length of time to be elapsed from the turning-ON of the thread waste suction nozzle/thread waste suction LK-1903CB :...

  • Page 75: Others

    9. OTHERS 9-1. Table of the standard pattern specifications Number of Lengthwise Crosswise Pattern S, F, H stitches Large size bartacking Large size bartacking Large size bartacking Large size bartacking Large size bartacking Large size bartacking Large size bartacking Large size bartacking Large size bartacking Large size bartacking Large size bartacking...

  • Page 76: Table Of The Standard Patterns

    9-2. Table of the standard patterns 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 marks, process the work clamp foot blank for use. 4.
  • Page 77 Sewing size Sewing size No. of No. of Num- Num- (mm) work (mm) work Stitch diagram ber of Stitch diagram ber of clamp clamp Length- Cross- Length- Cross- stitches stitches foot foot wise wise wise wise Outside diameter φ8 Inside diameter ø12 ø12...
  • Page 78 Sewing size Sewing size No. of No. of Num- Num- (mm) work (mm) work Stitch diagram ber of Stitch diagram ber of clamp clamp Length- Cross- Length- Cross- stitches stitches foot foot wise wise wise wise ☆ ø8 ø2 ☆ ø8 ø2.5 ☆...
  • Page 79 Sewing size Sewing size No. of No. of Num- Num- (mm) work (mm) work Stitch diagram ber of Stitch diagram ber of clamp clamp Length- Cross- Length- Cross- stitches stitches foot foot wise wise wise wise ☆ ☆ 20.5 6/7 ☆...

  • Page 80: Table Of The Work Clamp Foot

    9-3. Table of the work clamp foot 13518659 (asm.) 13548557 (asm.) 13542964 (asm.) Work clamp foot 14116107 14116404 14116800 14116305 14116206 (With knurl) (With knurl) (With knurl) (Without knurl) (Without knurl) Feed plate 21.2 11.4 Sewingspecification H / W ※ Finger guard 13533104 Supplied with F (foundation) Optional...
  • Page 81 13548151(asm.) 13542451 (asm.) 13571955 (asm.) 13561360 (asm.) Work clamp foot 13548003 13554803 14116602 14116503 14116909 14116701 (With knurl) (With knurl) (Without knurl) (Without knurl) (Without knurl) (With knurl) Feed plate 27.4 37.3 Sewing H / W specification ※ Finger 13548300 13533104 13573407 guard...

  • Page 82: Installing The Foot Pedal Switch (Optional)

    9-4. Installing the foot pedal switch (optional) DANGER : 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.
  • Page 83 2) Secure one side of FG cable ❷ to position B of the bed section with a screw. ❷ Draw out the terminal on the opposite side under the table stand. Take care to prevent the cable from being caught when raising the sewing machine. 3) Install ground mounting sheet ❸...

  • Page 84: One Touch Button Changeover Kit (Optional)

    9-5. One touch button changeover kit (optional) (1) Specifications Different specifications from those of the LK-1900C only are described. Max. sewing speed 2,700 sti/min Lift of the work clamp foot Max. 11mm Number of standard patterns 50 patterns * The DPx5 needle is used as with the LK-1900C. (2) Sewing modes Refer to "IV.2-3.
  • Page 85 2) Loosen setscrews ❽ and re- move needle hole guide ❾ . ❽ ❽ Install needle hole guide ❸ and secure with setscrews ❽ . ❾ ❸ 3) Install feed plate ❷ and secure with setscrew ❻ . In addition, install feed bracket asm. ❶ and se- cure with setscrews ❹...

  • Page 86: Movable Eye Guard (Optional)

    9-6. Movable eye guard (optional) (1) Installing the eye protection cover 1) Install eye guard kit ❶ to the mounting section with screws ❸ using hexagonal wrench (large) ❷ . ❷ ❸ ❶ 2) Pass the cord as shown in the figure. Install cord clips ❹...
  • Page 87 (2) Adjusting the position of the eye protection cover 1) Loosen screws ❶ . Adjust the ❷ eye protection cover to a desired position. (Max. 10°) After the adjustment, be sure to ❶ ❶ tighten screws ❶ without fail. After the adjustment, light- ly push cylindrical shaft ❷...
  • Page 88 (4) Face plate opening/closing operation Shift the eye protection cover before opening/closing the face plate. 1) Loosen screw ❶ and turn shaft ❷ . ❷ ❶ 2) Open frame cover ❸ . ❸ 3) After you have closed frame cover ❸ , return shaft ❷ to its previous position. Then, be sure to tighten screw ❶...

  • Page 89: Error List

    9-7. Error list Error code Indication Description of error Corrective measure Remarks E007 Machine lock error Turn OFF the power switch and remove the cause of troubles. The main shaft of the sewing machine does not rotate due to some troubles. E010 Pattern No.
  • Page 90 E063 Machine head identification error Turn the power OFF and con- The type of machine head and the type of tact JUKI or your distributor. control box do not match. E204 Connection alert for the USB thumb Re-operation is enabled after drive which is used for sewing resetting.
  • Page 91 Error code Indication Description of error Corrective measure Remarks E303 Z phase detection error Turn OFF the power switch. Detection of the upper dead point of the Check whether the pin of the sewing machine cannot be performed. MAIN board CN31 has come off or has loosened.
  • Page 92 Error code Indication Description of error Corrective measure Remarks E430 Counter set-value is reached Re-operation is enabled after The set value of the counter is reached. resetting. * For the type of counter and the counter value displayed depends on the prede- termined counter.
  • Page 93 Error code Indication Description of error Corrective measure Remarks 75 V/85 V low voltage error Check the 75 V/85 V supply volt- E817 75 V/85 V lower voltage error is detected. age. 24V overvoltage error Check the 24 V supply voltage. E818 75 V/85 V overvoltage error is detected.
  • Page 94 Error code Indication Description of error Corrective measure Remarks E901 Motor driver trouble Turn OFF the power switch and Error from the motor driver is detected. turn ON the power switch again after some time. E902 Main shaft motor overcurrent error Turn the power OFF.
  • Page 95 Error code Indication Description of error Corrective measure Remarks E997 Y-feed motor position deviation error Turn the power OFF. Check for The Y-feed motor has moved out of its load on the Y-feed motor. correct position. Check whether the MAIN PCB CN33 is disconnected or loose.

  • Page 96: Message List

    9-8. Message list Message No. Display Display message Description M520 Erase is performed. OK ? Erase confirmation of Users' pattern M521 Erase is performed. OK ? When deletion of the direct pattern is checked M522 Erase is performed. OK ? Erase confirmation cycle pattern M523 Pattern data is not stored in memory.
  • Page 97 Message No. Display Display message Description M548 Overwriting cannot be performed since data ex- Overwrite is disabled (media) ists. M581 Registration is canceled. Registration of a direct pattern M582 Copy is cancelled. Exited from the pattern data screen without copying M583 Copy is cancelled.

  • Page 98: Troubles And Corrective Measures (Sewing Conditions)

    9-9. Troubles and corrective measures (sewing conditions) Trouble Cause Corrective measures Page ① Stitches are slipped at the ◦ Adjust the clearance between the nee- 1. T h e n e e d l e t h r e a d slips off at the start of start.
  • Page 99 Trouble Cause Corrective measures Page ① The motions of the needle ◦ Correct the positions of the needle and 5. Stitch skipping often occurs. and shuttle are not properly shuttle. synchronized. ② The clearance between the ◦ Correct the positions of the needle and needle and shuttle is too shuttle.

  • Page 100: Table Of The Optional Parts

    9-10. Table of the optional parts Name of Parts Type Part No. Remarks Without knurl / processed 14120109 Feed plate blank Sewing area lengthwise 20 X crosswise 40 With knurl / processed 14120307 Sewing area lengthwise 20 X crosswise 40 Without knurl / stainless steel 14120505 t = 0.5...
  • Page 101 Name of Parts Type Part No. Remarks Finger guard (2) A=66.5 B=43 13573407 lengthwise bartacking Finger guard (3) A=21.5 B=35.5 14120000 For specially ordered work clamp SM8040302TP Work clamp foot blank With knurl / processed (right) 40021869 With knurl / processed (left) 40021870 PK57 changing cable asm.

  • Page 102: Explanation Of The Lk-1901C, Computer-Controlled High- Speed Eyelet Buttonhole Bartacking Machine

    II. EXPLANATION OF THE LK-1901C, COMPUTER- CONTROLLED HIGH-SPEED EYELET BUTTONHOLE BARTACKING MACHINE 1. SPECIFICATIONS Different specifications from those of the LK-1900C only are described. Max. sewing speed 3,000 sti/min Needle DPx5 #14, #16 Lift of the work clamp foot Max. 17mm Number of standard patterns 3 patterns 2.

  • Page 103: Preparation Of The Sewing Machine

    3. PREPARATION OF THE SEWING MACHINE 3-1. 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. scale ❷ ❶ 1) The maximum material closing amount is 4 mm. However, the amount is set to 2 mm at the time of deliv- ery because of the relation of the feed plate window and the work clamp foot (dimension C).

  • Page 104: Adjustment Of The Pressure Of The Work Clamp Unit

    3-3. 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. ❷ ❶ The pressure of the work clamp unit should be minimized as long as the material does not warp during sew- ing.

  • Page 105: Operation Of The Sewing Machine

    4. OPERATION OF THE SEWING MACHINE 4-1. Selection and confirmation 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.

  • Page 106: Explanation Of The Lk-1902C, Computer-Controlled High-Speed Belt-Loop Attaching Machine

    III. EXPLANATION OF THE LK-1902C, COMPUTER-CONTROLLED HIGH-SPEED BELT-LOOP ATTACHING MACHINE 1. SPECIFICATIONS Different specifications from those of the LK-1900C only are described. Max. sewing speed 3,000 sti/min Needle DPx5 #14, #16 Lift of the work clamp foot Max. 17mm Number of standard patterns 6 patterns 2.

  • Page 107: Operation Of The Sewing Machine

    3. OPERATION OF THE SEWING MACHINE 3-1. Selection and confirmation 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.

  • Page 108: Explanation Of The Lk

    IV. EXPLANATION OF THE LK-1903C, COMPUTER-CONTROLLED HIGH-SPEED LOCKSTITCH BUTTON SEWING MACHINE 1. SPECIFICATIONS Different specifications from those of the LK-1900C only are described. Max. sewing speed 2,700 sti/min Needle DPx17 #14 Lift of the work clamp foot Max. 13mm Number of standard patterns 50 patterns * The needle thread clamp device is set to prohibition (state of standard delivery) with memory switch U035.

  • Page 109: Various Sewing Modes

    2-3. 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 Stitch Number Standard Standard Pattern Stitch Number Standard Standard of threads...

  • Page 110: Adjustment Of The Sewing Machine

    (2) Selection of the sewing pattern and the sewing width ◦ Selection of the sewing pattern is the same as that of the LK-1900C. ◦ When the distance between holes of the button used does not fit the standard sewing width of the sew- ing pattern No., adjust the sewing width by enlarging/reducing the sewing width.

  • Page 111: Adjusting The Feed Plate

    4) Place a button in button clamp jaw levers ❶ . 5) Depress the pedal to the first step and detach your foot from the pedal when the button clamp unit comes down. ❷ 6) Turn the hand pulley and check that the center of ❶...

  • Page 112: Adjusting The Button Clamp Jaw Lever

    3-3. 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. Bring the machine to its stop-motion state. Then lift button clamp ❶ . Loosen screw ❷ in the button ❹...

  • Page 113: Adjustment Of The Pressure Of The Work Clamp Unit

    3-5. 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. ❷ ❶ The pressure of the work clamp unit should be minimized as long as the material does not warp during sew- ing.

  • Page 114: Others

    4. OTHERS 4-1. 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 ❸ on button clamp base ❷...

  • Page 115: Attaching The Shank Button (Optional)

    4-3. Attaching the shank button (optional) (1) Specifications Model Optional Needle TQx3 #14 Shape of button Outside diameter Max. ø20 Diameter of hole Min. ø1.5 Position of hole 1.5 mm or more Shape of shank sec- ℓ(mm) tion Minimum Maximum ℓ...
  • Page 116 (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. ❶ ❸ 4.3mm ❷ 1) Loosen needle bar connection screw ❶ and move the needle bar ❷ up or down so that second engraved marker line A as counted from the bottom is aligned with the bottom end of needlebar bushing ❸...
  • Page 117 (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. Loosen setscrew ❶ , and place the button to be used in ❸...
  • Page 118 (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. To adjust the position of button support rubber asm. ❶ , loosen setscrews ❷ and ❸ , and adjust so that ❶...

  • Page 119: Explanation Of The Lk

    V. EXPLANATION OF THE LK-1903CB HIGH-SPEED COMPUTER-CONTROLLED FLAT BUTTON SEWING MACHINE (WITH THE BIRD'S NEST PREVENTING AND SHORTER-THREAD REMAINING FUNCTIONS) 1. SPECIFICATIONS Different specifications from those of the LK-1900C only are described. Max. sewing speed 2,700 sti/min Thread Polyester spun thread #60 - #80 Needle DPx17 #11, #14 Lift of the work clamp foot...

  • Page 120: Installing The Regulator And Solenoid Valve Asm

    2-2. Installing the regulator and solenoid valve asm. ❸ ❷ ❶ ❶ Mount the solenoid valve asm. and regulator asm. on the undersurface of the table respectively with two set- screws ❶ and two setscrews ❷ . Mount the solenoid valve asm., near cord through-hole ❸ (see the figure) in and regulator asm. on the far left section of the undersurface of the table as observed from the worker.
  • Page 121 ❶ ❺ ❹ ❻ ❷ ❶ Shorter remaining thread suction pipe (coming from the throat plate base) ❷ Bird's nest suction pipe (coming from the bed) 2) Connect shorter remaining thread suction pipe ❶ and suction tube asm. ❹ . Fix suction tube asm.
  • Page 122 7) Connect shorter remaining thread suction pipe ❶ and suction tube asm.  to which bird's nest suc- tion pipe ❷ is connected respectively to air tube 8) Connect air tube  to solenoid valve  . (2) Connecting the regulator and solenoid valve asm. Connect coupling ❶...

  • Page 123: Connecting The Cords

    2-4. Connecting the cords DANGER : 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.

  • Page 124: Installing The Air Hose

    2-5. Installing the air hose ■ Air hose piping ❸ Connect air hose ❷ to regulator ❶ . ■ Adjusting the pneumatic pressure Pull up air regulating knob ❸ of the regulator. ❷ Then, turn the knob to adjust the pneumatic pres- sure at 0.5 MPa.

  • Page 125: Fixing The Finger Guard

    2-7. Fixing the finger guard DANGER : Be sure to install the finger guard since it protects fingers from contact with the mechanical section. ❶ ❷ ❸ ❹ ❹ ❸ Install finger guard (left) ❶ and (right) ❷ on the machine head with screws ❸ and washers ❹ . Install the finger guard, right ❷...

  • Page 126: Various Sewing Modes

    2-9. 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 Stitch Number Standard Standard Pattern Stitch Number Standard Standard shape...

  • Page 127: Adjustment Of The Sewing Machine

    3. ADJUSTMENT OF THE SEWING MACHINE WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. 3-1. Adjusting the knife for the shorter thread remaining thread trimmer When the compressed air is supplied, shorter-thread remaining thread trimmer cylinder ❶...

  • Page 128: Adjusting The Suction Pipe For The Shorter-Thread Remaining Functions

    3-2. Adjusting the suction pipe for the Shorter-thread remaining functions When the compressed air is supplied, suction cylin- der ❶ for Shorter-thread remaining functions moves backward. This is the initial position. Unless cylinder ❶ is in its recessed posi- tion when the pneumatic air is supplied, the piping connection is wrong.

  • Page 129: Replacing The Knife Of The Shorter-Thread Remaining Functions

    3-3. Replacing the knife of the Shorter-thread remaining functions 1) Remove screws ❶ at four locations. Then, knife base ❷ can be removed. ❶ ❷ 2) Moving knife support plate ❹ and moving knife ❺ removed in the joined state by removing ❸...

  • Page 130: Adjusting The Work Clamp Rod (For 1903Cbt Only)

    3-4. Adjusting the work clamp rod (For 1903CBT only) Fit work clamp rod ❶ in the slit in button guide foot ❷ . Fix the work clamp rod with setscrew ❸ while pushing the rod upward. ❸ The correct position of work clamp rod ❶ is as shown below.

  • Page 131: Cleaning The Thread Clamp

    4-2. Cleaning the thread clamp When thread is caught at top end ❶ of the thread clamp, thread clamp becomes incomplete and sewing trouble at the sewing start will be caused. If sewing problems such as stitch skipping occur at the beginning of sewing, the below-stated cleaning should be carried out.

  • Page 132: Explanation Of The Lk

    VI. EXPLANATION OF THE LK-1900CB COMPUTER- CONTROLLED, HIGH-SPEED BARTACKING MACHINE (WITH THE BIRD'S NEST PREVENTING AND SHORTER- THREAD REMAINING FUNCTIONS) This chapter only describes the items which are different from the LK-1903CB. All other items are same with the LK-1903CB. 1.

  • Page 133: Preparation Of The Sewing Machine

    2. PREPARATION OF THE SEWING MACHINE 2-1. Table of the sewing patterns Sewing size Sewing size (Note 2) (Note 2) (mm) (mm) Stitch diagram Stitch diagram No. of work No. of work Length- Cross- Length- Cross- clamp foot clamp foot wise wise wise...
  • Page 134 Sewing Sewing (Note 2) (Note 2) size (mm) size (mm) Stitch diagram Stitch diagram No. of work No. of work clamp foot clamp foot Cross- Length- Length- Cross- wise wise wise wise ø12 ø8 1. Pattern Nos. 41 to 46 are for the option- al work clamp foot No.

  • Page 135: Adjustment Of The Sewing Machine

    3. ADJUSTMENT OF THE SEWING MACHINE WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. 3-1. Replacing the bird's nest preventing knife 1) Remove screws ❶ at four locations. Then, knife base ❷...

  • Page 136: Drawing Of The Table

    VII. DRAWING OF THE TABLE 　　Part No. 40285157 ❶ ❷ ❹ ❼ ❾ ❸ ❺ ❻ ❽ ❶ 4- drilled hole 2, 10 deep on the rear side (stand installing hole) ❾ 6- drilled hole 2, 10 deep on the rear side (drawer installing hole) ❷...

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