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JUKI LBH-1790A Series Instruction Manual

Computer-controlled lockstitch buttonholing machine
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LBH-1790A Series
INSTRUCTION MANUAL

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Summary of Contents for JUKI LBH-1790A Series

  • Page 1 LBH-1790A Series INSTRUCTION MANUAL...

  • Page 2: Table Of Contents

    CONTENTS I. IMPORTANT SAFETY INSTRUCTIONS ............. 1 II. SPECIFICATIONS ..................1 1. Specifications ........................1 2. Standard sewing shape list ....................2 3. Configuration ........................3 III. INSTALLATION ..................4 IV. PREPARATION BEFORE OPERATION ..........14 1. Lubrication .........................14 2. Inserting the needle ......................14 3. Threading the needle-thread .....................15 4.
  • Page 3 24. How to adjust the contrast ....................57 25. How to set the key lock .....................57 26. Communication ........................58 VI. MAINTENANCE ..................61 1. Adjusting the needle-to-hook relation ................61 2. Adjusting the needle thread trimmer .................62 3. Adjusting the presser bar pressure ...................63 4.

  • Page 4: Important Safety Instructions

    I. IMPORTANT SAFETY INSTRUCTIONS 1) Never operate the machine unless the oiling tank has been properly lubricated. 2) Be sure to remove any dust from the hook or bobbin thread cutting knife section at the end of the day, and check the amount of oil remaining. 3) Be sure to return the activating pedal to the home position after the machine has started to run.

  • Page 5: Standard Sewing Shape List

    2. Standard sewing shape list (3) Radial square (5) Radial straight (6) Radial taper (7) Eyelet square (1) Square type (2) Round type (4) Radial type type bar-tacking type bar-tacking type type PANEL PANEL PANEL PANEL PANEL PANEL PANEL DISPLAY DISPLAY DISPLAY DISPLAY...

  • Page 6: Configuration

    3. Configuration ❻ ❷ ❸ ❶ ❹ ❺ ❼ LBH-1790A consists of the following components. ❶ Power switch ❷ Machine head (LBH-1790A) ❸ Operation panel ❹ Control box (MC-602) ❺ Presser lifting and starting pedal ❻ Thread stand device ❼ Power switch (EU type) –...

  • Page 7: Installation

    III. INSTALLATION WARNING : To prevent possible accidents caused by the fall of the sewing machine, perform the work by two persons or more when the machine is moved. (1) Preparation for assembly of the control box ❶ 1) Fix reinforcing plates ❷ on control box ❶ with bolts ❸...
  • Page 8 (2) Set-up of the table 1) Fix control box  , power switch  and pedal sensor  on table  . 2) Fix power switch  with a staple. 3) Pass four bed base fixed screws  through bed base  . 4) Set rubber cushions  to holes  (4 places) for fixing bed base and fix bed base  .
  • Page 9 (3) Connecting the power source cord • Connecting the power cable Voltage specifications are shown on the power indication tag attached on the power cable and on the rating plate adhered on the power box. Connect the cable which matches the specifications. Power indication tag Rating plate (For example: In the...
  • Page 10 (4) Installing the sewing machine main unit WARNING : To prevent possible accidents caused by the fall of the sewing machine, perform the work by two persons or more when the machine is moved. 1) Place hinge plates ❶ and shaft bearings ❷ -1 (rubber) and ❷...
  • Page 11 (6) Connecting the machine head tilt detector Connect machine head tilt detector ❶ with connector ❷ located on the machine head ❷ side. ❶ (7) Installing the hook oil shield plate Install hook oil shield plate ❶ onto bed base ❸ with setscrew ❷...
  • Page 12 (9) Connecting the cords ❷ Sewing machine head Earth cord CN15 CN17 ❹ ❶ CN32 CN40 CN49 1) Loosen four setscrews ❷ of control box cov- er ❶ . Remove control box cover ❶ . Operation panel 2) Connect the cord to the connector on the CN39 MAIN PCB as illustrated in the figure below.
  • Page 13 (10) Managing the cord 1) Slowly tilting the sewing machine, check that the cords are not forcibly pulled. When you tilt the sewing ma- chine, make sure that the sewing machine head support bar ❶ is placed on the table. ❶...
  • Page 14 (11) 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 install and use eye protection cover ❶ and use the sewing machine. When placed longitudinally When placed horizontally ❶...
  • Page 15 (13) Thread guide rod Securely fit the thread guide rod so that two side holes in the thread guide rod face the thread Thread guide rod guide. (14) Installing the thread stand 1) Assemble the thread stand, and set it in the hole in the top right corner of the machine table.
  • Page 16 (15) Installing the auxiliary table 1) Temporarily fix two auxiliary table mount- ing plates ❶ on auxiliary table ❷ with four bolts ❸ . 2) Temporarily fix auxiliary table ❷ on the ❷ sewing machine bed with two bolts ❹ . 3) Fix four bolts ❸...

  • Page 17: Preparation Before Operation

    IV. PREPARATION BEFORE OPERATION 1. Lubrication WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. ❷ ❶ ❸...

  • Page 18: Threading The Needle-Thread

    3. Threading the needle-thread WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. ❶ ❼...

  • Page 19: Adjusting The Bobbin Thread Tension

    5. Adjusting the bobbin thread tension ❷ ❶ Adjust the bobbin thread tension as given below when the bobbin thread is pulled up at the position where thread slit ❶ of bobbin case comes up. To such an extent that bobbin case quietly comes down when holding Purl stitch 0.05 to 0.15N thread end coming from bobbin case and shaking it quietly up and...

  • Page 20: Installing The Knife

    7. Installing the knife WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. When replacing the knife with a new one, perform as ❷...

  • Page 21: Operation Of The Sewing Machine

    V. OPERATION OF THE SEWING MACHINE 1. Explanation of the operation panel switch ❻ ❼ ❶ ❽ ❾ ❷ ❸ ❹ ❺ – 18 –...
  • Page 22 NAME FUNCTION NAME FUNCTION ❶ LCD display Various data such as pattern OVEREDGING This key selects overedging width No., shape, etc. are displayed. display. WIDTH key Every time this key is pressed, S005 and S006 are displayed alter- nately. ❷ READY key Press this key when starting PITCH key...

  • Page 23: Basic Operation Of The Sewing Machine

    2. Basic operation of the sewing machine 1) Turn ON the power switch. When you turn ON the power to the sewing machine for the first time after the purchase, the language selection screen A is displayed. Select the language to be displayed, then press return key ❾...

  • Page 24: How To Use The Pedal

    3. How to use the pedal For this sewing machine, the pedal operation method to be used can be selected from among the four dif- ferent ones as described on the next page. Select the operating procedure you desire for working efficien- cy and use the sewing machine.

  • Page 25: Initial Position

    (2) Explanation of pedal motion 1-pedal 1-pedal 1-pedal 2-pedal type (Without intermediate (With intermediate (With a depress on the position) position) back part of the pedal) Initial position Initial position Initial position Initial position Presser : Intermediate Presser : Maximum Presser : Maximum po- Presser : Intermediate position ②...

  • Page 26: Input Of The Presser Type

    4. Input of the presser type (1) Setting procedure of the presser type ❼ 1) Call the presser type setting parameter. ❹ When MODE key is pressed, the memory switch (level 1) edit screen A is dis- played. 2) Select the presser type. ❼...

  • Page 27: Performing Pattern Selection

    5. Performing pattern selection (1) Selection from the pattern selection screen 1) Set the mode to the input mode. ❼ Under the input mode where SET READY LED  goes out, pattern selection is enabled. If the current mode is the sewing mode, press ❷...

  • Page 28: Changing Needle Thread Tension

    6. Changing needle thread tension Needle thread tension can be changed while performing trial sewing since the data related to the needle thread tension can be set by the sewing mode as well. 1) Call thread tension at parallel section setting data.

  • Page 29: Performing Re-Sewing

    7. Performing re-sewing When stop switch A is pressed during sewing operation, the sewing machine interrupts sewing and stops. At this time, error display screen B is displayed to inform that the stop switch is pressed. To continue performing sewing from some point in sewing Sewing motion stop status Error display screen B is displayed.

  • Page 30: Winding Bobbin Thread

    8. Winding bobbin thread (1) Winding the bobbin 1) Set the bobbin. Fit a bobbin fully onto the bobbin winder shaft. Take the thread from the spool and pass it through the guides in the numerical order as shown in the figure, and wind the end of the thread several times around the bobbin.

  • Page 31: Using The Counter

    9. Using the counter (1) Setting procedure of the counter value ❻ ❼ 1) Call counter setting screen. When COUNTER key  is pressed under the input mode where SET READY LED  goes out, the counter screen A is displayed to enable setting of the counter.
  • Page 32 (2) Kind of counter 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 Sewing DOWN counter Every time the sewing of one shape is performed, the existing value is counted down.

  • Page 33: Using The Initial Value Pattern

    10. Using the initial value pattern This sewing machine has the initial value to perform the optimum sewing for the sewing shapes (31 shapes). → Refer to "XI. INITIAL VALUE DATA FOR EACH SHAPE TABLE" p.76. When creating sewing data newly, it is convenient to create it by copying the initial value pattern. 1) Set the mode to the input mode.

  • Page 34: Changing Sewing Data

    11. Changing sewing data (1) Initial sewing data at the time of your purchase Patterns from 1 to 10 have been already registered at the time of your purchase. Initial values of the square type, the cloth cutting length of which only is different from each other, have been inputted in the →...

  • Page 35: Method Of Setting Sewing Data With/Without Edit

    12. Method of setting sewing data with/without edit This sewing machine has been set so as not to be capable of editing sewing data items which are less frequently used at the time of your purchase. When you desire to set the data more closely in accordance with the sewing products, set the sewing data item to the edit possible state and use the machine.

  • Page 36: Sewing Data List

    13. Sewing data list ☆ Sewing data are those that can be inputted to 99 patterns from pattern 1 to 99 and can be inputted to each pattern. The sewing machine has been set in the state that the data which is necessary to set “With/ without edit”...
  • Page 37 Item Setting range Edit unit Remarks Compensation of bar-tacking width, right S010 -1.00 to 1.00 0.05 mm – This item adjusts right side outer shape of bar-tack- ing section in terms of overedging section. It is cor- rected 1st and 2nd bar-tacking together. Top of Bottom Bottom of...
  • Page 38 Item Setting range Edit unit Remarks Pitch at bar-tacking section S021 0.200 to 2.500 0.025 mm – This item sets sewing pitch of bar-tacking section. Top of Top of Top of square round semilunar type type type Bottom of Bottom of straight bar- taper bar- tacking...
  • Page 39 Item Setting range Edit unit Remarks Crosswise compensation of needle entry S040 0.0 to 1.0 0.1 mm of basting This item sets the amount to move needle entry position to the right or left when performing basting more than two cycles. S041 Compensation of left side position of bast- -2.0 to 2.0...
  • Page 40 Item Setting range Edit unit Remarks ACT timing adjustment at the start of right S060 -5 to 5 1 stitch overedging This item adjusts needle thread tension output start timing at right overedging section. S061 ACT timing adjustment at the start of 2nd -5 to 5 1 stitch bar-tacking...
  • Page 41 Item Setting range Edit unit Remarks Maximum speed limitation S084 400 to 4200 100 sti/min – This item sets max. speed limitation of the sewing machine. The maximum value of data edit is equal to the number of revolutions of K007 Maximum speed limitation of the memory switch data.

  • Page 42: Copying Sewing Pattern

    14. Copying sewing pattern 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 43: How To Edit/Check The Data Other Than Sewing Data

    15. How to edit/check the data other than sewing data The screen for editing/checking the various data is invoked by selecting the menu on the mode screen. 1) Set the mode to input mode. Under the input mode where set ready LED  ❻...
  • Page 44 3) Selecting the menu. Items which can be registered on the key are displayed. Press ITEM SELECT key ❻ to select the target menu. When you press EDIT key ❽ during the menu selection, the following screens can be invoked. Memory switch 1 →...

  • Page 45: Using Parameter Register Key

    16. Using parameter register key Register parameters which are frequently used with parameter register key and use them. Parameters which have been registered can be selected by pressing only the parameter register key under the input mode. (1) Method of register 1) Set the mode to the input mode.

  • Page 46: Performing Continuous Stitching

    17. Performing continuous stitching This sewing machine can perform continuous stitching which is capable of continuously sewing plural sewing pattern data without lifting the presser foot. It is possible to automatically sew up to maximum 6 shapes in one cycle. In addition, registration of as many as 20 data can be performed.
  • Page 47 (2) Method of editing continuous stitching data 1) Set the mode to the input mode. ❽ ❻ ❼ ❾ Under the input mode where SET READY LED  goes out, entry of the continuous-sewing data is enabled. If the current mode is the sewing mode, press READY key ❷...
  • Page 48 4) Change data of selected editing point. Press DATA CHANGE key ❼ , and data of editing point can be changed. When the editing point is at the pattern No. : Pattern No. which has been registered is displayed and it is possible to select. When the editing point is at the jump feed : It is possible to edit numerical value within the range of ±120 mm.

  • Page 49: Performing Cycle Stitching

    18. Performing cycle stitching This sewing machine can perform sewing of plural sewing pattern data in one cycle in the order of the data. As many as 30 different patterns can be entered. Use this function to sew two or more different buttonholes on sewing products.
  • Page 50 (2) Method of editing cycle data 1) Set the mode to input mode. ❽ ❻ ❼ ❾ 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 READY key ❷...
  • Page 51 4) Change data of selected editing point. Press DATA CHANGE key ❼ and data of editing point can be changed. Pattern No. which has been registered is displayed and it is possible to select. In addition, press RESET key ❸ , and the pattern data of editing point can be deleted.

  • Page 52: How To Change The Name Of Cycle/Continuous Sewing Data

    19. How to change the name of cycle/continuous sewing data 1) Putting the data name in the edit state. "V-17. Performing continuous stitch- Refer to ❻ ❼ ing" p.43 "V-18. Performing cycle stitch- ing" p.46. 2) Selecting the data name edit point. When you press ITEM SELECT key ❻ , the edit point will move in sequence.

  • Page 53: Explanation Of Plural Motions Of Knife

    20. Explanation of plural motions of knife This sewing machine can automatically actuate the knife plural times and sew a buttonhole larger than the size of knife by setting the size of knife attached from the operation panel. Set and use this function when sewing various sewing shapes without replacing the knife.

  • Page 54: Method Of Changing Memory Switch Data

    21. Method of changing memory switch data 1) Set the mode to input mode. Under the input mode where SET READY LED ❻ ❼  goes out, change to the memory switch data is enabled. If the current mode is the sewing mode, press READY key ❷...

  • Page 55: Memory Switch Data List

    22. Memory switch data list (1) Level 1 ☆ Memory switch data (level 1) are the motion data that the sewing machine has in common and the data that operate on all sewing patterns in common. Item Setting range Edit unit Initial value Presser lifter maximum position U001...
  • Page 56 Item Setting range Edit unit Initial value U018 Cloth cutting knife size 3.0 to 32.0 0.1 mm 32.0 mm Input knife size used. U019 Function of plural motions of cloth cutting knife – – Ineffective Ineffective/effective Ineffective Effective Function of thread breakage detection Ineffective/ U020 –...
  • Page 57 (2) Level 2 ☆ Press MODE switch for as long as three seconds and it is possible to edit. Item Setting range Edit unit Initial value Pedal selection K001 – – 1-pedal Pedal type is set. → Refer to "V-3. How to use the pedal" p.21. (Without intermediate position)
  • Page 58 Item Setting range Edit unit Initial value K018 Pattern selection function under sewing mode – – Ineffective Ineffective/effective Ineffective Effective K019 Thread trimming on the way in continuous stitching – – Permitted Permitted/Prohibited Permitted Prohibited K021 Release amount of bobbin thread trimmer at 0 to 15 1 pulse the start of sewing...

  • Page 59: How To Adjust The Pedal Variable Resistor

    23. How to adjust the pedal variable resistor The variable resistor of the pedal can be adjusted by depressing the pedal or inputting a pedal variable resistor value on the operation panel. ❽ ❻ ❼ 1) Calling the pedal variable resistor adjustment screen.

  • Page 60: How To Adjust The Contrast

    24. How to adjust the contrast The contrast of the display on the panel can be adjusted in five steps. 1) Calling the contrast adjustment ❽ ❼ screen. Select the contrast adjustment from the menu on the mode screen and press EDIT key ❽ Then, the contrast adjustment screen A is dis- played.

  • Page 61: Communication

    Data on needle entry points created with Vector form data VD00 XXX .VDT the PM-1. The data form is commonly used among JUKI sewing machine. * Refer to the Engineer's Manual for how to set the vector form data. 3) Selecting the communication direction. ❻...
  • Page 62 4) Selecting the number. ❻ ❼ Press ITEM SELECT key ❻ to select file No. B to be read. Press DATA CHANGE key ❼ to select file No. C to be written. Press set READY key ❷ to write the data in file No.
  • Page 63 • 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 64: Maintenance

    VI. MAINTENANCE 1. Adjusting the needle-to-hook relation WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the fol- lowing work after turning the power off and ascertaining that the motor is at rest. Adjust the needle-to-hook relation when the needle ❶...

  • Page 65: Adjusting The Needle Thread Trimmer

    2. Adjusting the needle thread trimmer WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the fol- lowing work after turning the power off and ascertaining that the motor is at rest. (1) Adjusting the thread grasping force of the needle thread trimmer If the needle thread trimmer fails to provide consis-...

  • Page 66: Adjusting The Presser Bar Pressure

    3. Adjusting the presser bar pressure WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the fol- lowing work after turning the power off and ascertaining that the motor is at rest. The presser bar pressure should be set on a pattern-by-pattern basis.

  • Page 67: Thread Tension

    5. Thread tension (1) Thread take-up spring (purl stitch) 1) The thread take-up amount of thread take-up ❶ spring ❶ is 8 to 10 mm, and the appropriate ❸ pressure at the start is approximately 0.06 to 0.1N. 2) To change the stroke of the thread take-up spring, loosen screw ❷...

  • Page 68: Replacing The Fuse

    6. Replacing the fuse WARNING : 1. To avoid electrical shock hazards, turn OFF the power and open the control box cover after about five minutes have passed. 2. Open the control box cover after turning OFF the power without fail. Then, replace with a new fuse with the specified capacity.

  • Page 69: Gauge Components

    VII. GAUGE COMPONENTS 1. Cloth cutting knife A Knife size (inch) B Knife size (mm) C Mark D Part No. B2702047F00 B2702047K00A 7/16 11.1 B2702047I00 12.7 B2702047L00A 9/16 14.3 B2702047V00 15.9 B2702047M00A 11/16 17.5 B2702047A00 19.1 B2702047N00 22.2 B2702047P00 25.4 B2702047Q00A 1-1/4 31.8 B2702047S00A 2.

  • Page 70: Error Code List

    VIII. ERROR CODE LIST Error code Description How to recover Place of recovery Contact of initialization of EEP-ROM of MAIN CONTROL E001 Turn OFF the pow- p.c.b. When data is not written in EEP-ROM or data is broken, initialization of the data is automatically informed. Main shaft motor-lock E007 Turn OFF the pow-...
  • Page 71 Error code Description How to recover Place of recovery E043 Enlargement error Possible to recover Data input screen Stitching pitch exceeds 5 mm. by reset. E050 Stop switch Possible to recover Step screen When stop switch is pressed during machine running. by reset.
  • Page 72 Error code Description How to recover Place of recovery E487 Eyelet shape length error Possible to re-en- (During individual sewing/cycle Eyelet shape length is too short to form the ter after pressing sewing) shape in case of eyelet shape. reset key. Sewing data edit screen [S014] Eyelet shape length (During continuous sewing)
  • Page 73 Error code Description How to recover Place of recovery E499 Presser size error (Length direction : rear) Possible to (During individual sewing/ When stitching data exceeds the size of rear of length re-enter after cycle sewing) direction of presser. pressing reset Sewing data edit screen key.
  • Page 74 Error code Description How to recover Place of recovery E908 Y feed motor origin retrieval error Turn OFF the power. When origin sensor signal is not inputted at the time of origin retrieval motion. E909 Needle thread trimmer motor origin retrieval error Turn OFF the power.

  • Page 75: Troubles And Corrective Measures

    IX. TROUBLES AND CORRECTIVE MEASURES Troubles Causes Corrective measures Page 1. Needle thread break- 1. Thread tension at parallel section is too high. ○ Decrease the thread tension at parallel section. 2. Pressure or stroke of thread take-up spring is ○ Decrease the tension of thread take-up too large.
  • Page 76 Troubles Causes Corrective measures Page 10. Needle thread breaks 1. Tension at the start of sewing is too low. ○ Increase tension at the start of sewing. at the start of sewing, or the wrong side of seam is dirty. 11.

  • Page 77: Drawing Of The Table

    X. DRAWING OF THE TABLE – 74 –...
  • Page 78 ● Drawing of the table for the sewing machine with a two-pedal unit – 75 –...

  • Page 79: Initial Value Data For Each Shape Table

    XI. INITIAL VALUE DATA FOR EACH SHAPE TABLE Shape selection Level 3 (31 shapes) Item Unit Shape selection Level 2 (20 shapes) Shape selection Level 1 (12 shapes) S001 Sewing shape Cloth cutting length S002 12.7 12.7 12.7 12.7 12.7 12.7 12.7 12.7 12.7 12.7 12.7 12.7 12.7 12.7 12.7...

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Lbh-1795a

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