JUKI lbh-1790 series Engineer's Manual
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JUKI lbh-1790 series Engineer's Manual

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See also: Handbook , Instruction Manual
R
Computer-controlled, High-speed,
Lockstitch Buttonholing Machine
LBH-1790
Series
ENGINEER'S MANUAL
40006360
No.E352-00

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Summary of Contents for JUKI lbh-1790 series

  • Page 1 Computer-controlled, High-speed, Lockstitch Buttonholing Machine LBH-1790 Series ENGINEER’S MANUAL 40006360 No.E352-00...
  • Page 2 PREFACE This Engineer’s Manual is written for the technical personnel who are responsible for the service and maintenance of the machine. The Instruction Manual for these machines intended for the maintenance personnel and operators at an apparel factory contains operating instructions in detail. And this manual describes “Standard Adjustment”, “Adjustment Procedures”, “Results of Improper Adjustment”, and other important information which are not covered by the Instruction Manual.

  • Page 3: Table Of Contents

    CONTENTS 1. SPECIFICATIONS ..................... 1 2. STANDARD SEWING SHAPE LIST ..............2 3. STANDARD ADJUSTMENT ................3 (1) Height of the needle bar ....................3 (2) Needle-to-hook timing ..................... 3 (3) Adjusting the feed timing belt tension ................5 (4) Knife drop position ......................5 (5) Adjusting the stroke and initial position of the cloth cutting knife ......
  • Page 4 4. ADJUSTING EACH SENSOR ................. 37 (1) Adjusting the needle rocking origin ................37 1) Needle rocking motor origin compensation .................... 38 (2) Adjusting the feed origin ....................39 1) Feed motor origin compensation ......................40 5. DISASSEMBLING/ASSEMBLING PROCEDURE .......... 41 (1) Disassembling/assembling the main shaft ..............
  • Page 5 12. ELECTRICAL COMPONENTS..............90 (1) Change of data ROM ..................... 90 (2) Adaptation to the high voltage ..................90 (3) DIP switch........................90 (4) Adaptation to the PK pedal ................... 91 (5) Fuse list .......................... 92 13. GAUGE COMPONENTS AND OPTIONAL COMPONENTS ......93 14.

  • Page 6: Specifications

    Lubrication method Face plate section : dry Hook section : minute quantity lubrication (dry hook : no lubrication) Lubricating oil JUKI New Defrix oil No.1 (Equivalent to ISO VG7) Grease JUKI exclusive grease, TEMPLEX Dimensions Width of machine bed : 200 mm, Height : 364 mm, Length : 630 mm...

  • Page 7: Standard Sewing Shape List

    2. STANDARD SEWING SHAPE LIST (5) Radial straight bar- (6) Radial flow bar-tacking (1) Square type (2) Round type (3) Radial square type (4) Radial type tacking type type PANEL PANEL PANEL PANEL PANEL PANEL DISPLAY DISPLAY DISPLAY DISPLAY DISPLAY DISPLAY (9) Eyelet straight bar- (10) Eyelet flow bar-...

  • Page 8: Standard Adjustment

    3. STANDARD ADJUSTMENT (1) Height of the needle bar Standard Adjustment Adjust the height of the needle bar so that the distance from the top surface of the throat plate to the lower end face of the needle bar is 12.0 mm (S : standard) or 11.3 mm (K : knit) when the needle bar is in the lowest dead point.
  • Page 9 Adjustment Procedures Results of Improper Adjustment 1. Enter timing gauge [1] 1 supplied with the machine as ™ For the floppy fabrics, it is accessories between the throat plate and the lower end of the effective when the needle bar is needle bar as shown in the figure, fit the needle bar to timing s l i g h t l y l o w e r e d t h a n t h e gauge [1] 1, loosen the setscrew 2 in the needle bar...

  • Page 10: Adjusting The Feed Timing Belt Tension

    (3) Adjusting the feed timing belt tension Standard Adjustment General drawing of feed mechanism Feed stepping motor Feed shaft Feed guide shaft (4) Knife drop position Standard Adjustment Knife should drop in the center of the knife drop groove in the throat plate. Throat plate Knife drop groove Edge of machine arm...
  • Page 11 Adjustment Procedures Results of Improper Adjustment 1. Adjust the position of feed motor installing plate 6 so that the ™ When the belt tension is low, lengthwise feed timing belt tension is applied with 70 to 80N. correct lengthwise feed pitch 2.

  • Page 12: Adjusting The Stroke And Initial Position Of The Cloth Cutting Knife

    (5) Adjusting the stroke and initial position of the cloth cutting knife Standard Adjustment General drawing of cloth cutting knife Knife sensor Cushion Knife bar Knife return spring Knife driving lever Knife bar rotary stopper Knife return spring Machine Cushion 10 mm Sensor 14 mm...
  • Page 13 Adjustment Procedures Results of Improper Adjustment 1. Make the height of knife return stopper 1 10 mm from the ™ If the distance of 4 mm is work plane of the machine arm and fix it with nut 2. (Adjustment excessively small, the knife of initial position of the knife) installing base comes in contact...

  • Page 14: Adjusting The Rotary Play Of The Cloth Cutting Knife

    (6) Adjusting the rotary play of the cloth cutting knife Standard Adjustment General drawing of cloth cutting knife Cloth cutting knife solenoid Knife sensor Knife return stopper Cushion Knife driving lever Square block base (7) Replacing the knife Standard Adjustment Inch / mm conversion table Knife size (inch indication) mm indication...
  • Page 15 Adjustment Procedures Results of Improper Adjustment 1. Fix knife bar rotary stopper 3 and the setscrew of thrust collar ™ When the rotary play is large, 4 (from the left side of the machine arm) so that when moving the cloth cutting knife may knife bar 1 up or down, it moves smoothly and there is no interfere with the throat plate.

  • Page 16: Adjusting The Needle Thread Trimmer

    (8) Adjusting the needle thread trimmer Standard Adjustment 1) Adjusting the thread grasping force of the needle thread trimmer 2) Adjusting the height of the needle thread trimmer − −...
  • Page 17 Adjustment Procedures Results of Improper Adjustment 1. If needle thread trimmer 2 fails to provide consistent thread ™ When the thread grasping force grasping force, loosen setscrew 1 and remove needle thread of needle thread trimmer 2 is trimmer 2. low, slip-off of needle thread at 2.

  • Page 18: Needle Thread Trimming Adjustment Mode

    Standard Adjustment 3) Needle thread trimming adjustment mode Thread release Thread holding position (-86 pulses) position (0 pulse) * When entering the adjustment Origin mode, the position is in the state position of origin position. Waiting position Thread trimming (10 pulses) position (40 pulses) Needle thread trimming adjustment mode motion / Thread holding position / Thread release position / Waiting position / Thread trimming position...
  • Page 19 Adjustment Procedures Results of Improper Adjustment 1. Press MODE key 4 to enter memory switch level 2 of the adjustment mode. with ITEM SELECTION key !0 2. Select and press READY key 2 3. Every time ITEM SELECTION key ! 0 is pressed, the four positions as shown in the figure are repeatedly moved and can be changed over in order.

  • Page 20: Adjusting The Needle Thread Trimmer Origin Sensor

    Standard Adjustment 4) Adjusting the needle thread trimmer origin sensor Thread release position Thread trimming position 5) Lateral adjustment of the needle thread trimmer (start of sewing) 0 to 3 mm * Thread holding : “0” pulse − −...
  • Page 21 Adjustment Procedures Results of Improper Adjustment 1. Adjust the origin sensor with the respective initial data of thread ™ If A and B are not equal to each releasing position (-86) and thread trimming position (40) other, step-out of needle thread referring to 3) Needle thread trimming adjustment mode.

  • Page 22: Longitudinal And Lateral Adjustment Of The Needle Thread Trimmer (At The Time Of Trimming)

    Standard Adjustment 6) Longitudinal and lateral adjustment of the needle thread trimmer (at the time of trimming) (4 to 6 mm) * Thread trimming position : 40 pulses 7) Opening amount of the needle thread trimmer * Thread release position : -86 pulses −...
  • Page 23 Adjustment Procedures Results of Improper Adjustment 1. Start up 3) Needle thread trimming adjustment mode and set ™ If the adjustment is improper, the trimmer to thread trimming position (40). needle thread is missed at the 2. Loosen setscrews 1 and adjust so that the longitudinal position time of trimming and cannot be of the trimmer is set to 0 to 3 mm from the center of the needle trimmed.

  • Page 24: Adjusting The Needle Thread Draw-In Amount

    Standard Adjustment 8) Adjusting the needle thread draw-in amount (9) Adjusting the bobbin thread trimmer Standard Adjustment 1) Bobbin thread trimmer adjustment mode Bobbin thread trimmer adjustment mode Waiting position (“0” pulse) Origin position Thread trimming Thread release position (50 pulses) position (-22 pulses) * When entering the adjustment mode, the position is in the state of...
  • Page 25 Adjustment Procedures Results of Improper Adjustment 1. Loosen setscrews 2 in draw-in link B 1 and move needle ™ When needle thread draw-in thread draw-in arm 3 to adjust needle thread draw-in amount a m o u n t i s e x c e s s i v e l y A (position of needle thread draw-in lever 4) at the time of increased, or needle thread draw-in arm 3 is excessively...

  • Page 26: Adjusting The Bobbin Thread Trimming Origin Sensor

    Standard Adjustment 2) Adjusting the bobbin thread trimming origin sensor To align edges with each other Bobbin thread trimming sensor 3) Adjusting the position of the trimmer ™ Remove the hook and oil tank to adjust the position. Bobbin thread trimmer (Caution) Fix hexagon screw 1 when eccentric pin 2 is tilted in the direction of the arrow mark.
  • Page 27 Adjustment Procedures Results of Improper Adjustment Loosen setscrews 2 in bobbin thread trimming origin detecting sensor installing plate 1, align the edges of the arrrow mark in the figure with each other, and tighten setscrews 2. After assembling the sensor installing plate, check and adjust the motion referring to “(9) - 1) Bobbin thread trimmer adjustment mode”.

  • Page 28: Replacing The Bobbin Thread Trimmer

    Standard Adjustment 4) Replacing the bobbin thread trimmer 5) Open timing and open amount ™ Thread holding position Clearance between bobbin thread trimmer upper knife pin 2 and bobbin thread working arm 3 is 0.5 to 1.5 mm. ™ Open amount at start of opening Overlapping amount (arrow mark section) of the top end of bobbin thread trimmer upper knife 4 and holding spring 5 is almost “0”.
  • Page 29 Adjustment Procedures Results of Improper Adjustment 1. Put the sewing machine in the bobbin thread trimming adjustment mode with level 2 of memory switch. Refer to “1) Bobbin thread trimmer adjustment mode”. 2. Put the position to thread trimming position (state in the figure on the left side) with ITEM SELECTION key !0 Remove setscrews 1 and 2, and replace bobbin thread trimmer 3.

  • Page 30: Adjusting The Presser Lifter

    (10) Adjusting the presser lifter Standard Adjustment 1) Adjusting the backlash of the presser lifter gear 1. For the backlash of the presser lifter gear, adjust the installing position of presser lifter motor 1 to remove the backlash. 2. Adjust so that backlash is 0.05 to 0.1 mm. 2 (4 pcs.) 2) Adjusting the presser bar position bracket Work plane of the machine arm...
  • Page 31 Adjustment Procedures Results of Improper Adjustment 1. Loosen four setscrews 2 in the presser lifter motor, put a sheet ™ When backlash is large, presser of thin paper (approximately 0.05 mm thick) between gear, f o o t l i f t i n g w o r k i n g n o i s e large 3 and gear, small 4, close the play, and fix four increases.

  • Page 32: Adjusting The Presser Lifter Origin Sensor

    Standard Adjustment 3) Adjusting the presser lifter origin sensor 1 Adjusting the senor Draw backward. 2 Refer to the adjusting procedure of the presser lifter motor origin compensation − −...
  • Page 33 Adjustment Procedures Results of Improper Adjustment 1 Adjusting the sensor ™ W h e n t h e a d j u s t m e n t i s Insert a spacer of 3 mm (hexagonal wrench key of 3 mm or the improper, the number (display) like) between the presser foot and the throat plate, turn ON on the panel is different from the...

  • Page 34: Adjusting The Thread Tension

    (11) Adjusting the thread tension Standard Adjustment 1) Adjusting the stroke of the thread tension solenoid 1 ± 0.3 mm 2 to 2.5 mm To align edge 2) Adjusting the thread take-up spring tension (purl stitching) − −...
  • Page 35 Adjustment Procedures Results of Improper Adjustment 1. Align shaft end 1 of solenoid with the edge of thrust collar 2. ™ When the dimension value, 2. Assemble thread tension connecting plate 3 in the direction 1± 0 . 3 m m i s e x c e s s i v e l y as shown in the figure.

  • Page 36: Adjusting The Bobbin Winder

    (12) Adjusting the bobbin winder Standard Adjustment Main shaft 0.5 ± 0.2 mm Bobbin winder (13) Adjusting the thread breakage detecting plate Standard Adjustment − −...
  • Page 37 Adjustment Procedures Results of Improper Adjustment Adjust and fix the position of bobbin winder driving wheel 2 with ™ If the pressing pressure is low, rubber ring 1 slips and bobbin the setscrew so that a clearance of 0.5±0.2 mm is provided between rubber ring 1 and bobbin winder driving wheel 2 in the thread may not be wound.

  • Page 38: Adjusting The Bobbin Presser

    (14) Adjusting the bobbin presser Standard Adjustment Front end of machine bed 8 to 15 mm − −...
  • Page 39 Adjustment Procedures Results of Improper Adjustment 1. Adjusting the waiting position of the bobbin presser Loosen nut 1 and adjust the distance from screw 2 to the bobbin presser base to 5 mm. Adjust so that the distance from the top end of bobbin presser 4 to the front end of machine arm (dimension as shown in the figure) is 8 to 15 mm and tighten nut 1.

  • Page 40: Adjusting The Pedal

    (15) Adjusting the pedal Standard Adjustment Pedal ™ 2-pedal • 1-pedal (Without intermediate position) ™ 1-pedal (With intermediate position) 1 : Maximum position 2 : Intermediate position 3 : Cloth setting position 4 : Sewing position − −...
  • Page 41 Adjustment Procedures Results of Improper Adjustment Adjusting of the pedal in accordance with the pedal type setting Attach or remove setscrew 1 in accorance with the setting of memory switch level 2 ™ 2-pedal and 1-pedal (without intermediate position) / Attach setscrew 1.

  • Page 42: Adjusting Each Sensor

    4. ADJUSTING EACH SENSOR (1) Adjusting the needle rocking origin Standard Adjustment Throat plate 1.8 mm Center of throat plate − −...

  • Page 43: Needle Rocking Motor Origin Compensation

    Adjustment Procedures Results of Improper Adjustment (1) Adjusting the needle rocking origin 1. Origin of needle rocking stepping motor 4 can be adjusted with memory switch level 2 2. Loosen setscrew 2 in needle bar rocking lever, rear 1, and make a state that needle bar rocking frame 3 can move freely to the right and left.

  • Page 44: Adjusting The Feed Origin

    (2) Adjusting the feed origin Standard Adjustment General drawing of feed mechanism Feed stepping motor Feed base Adjustment screw Feed shaft Feed guide shaft Timing belt Feed driven shaft Feed base 2.5±0.3 mm (2.2 to 2.8 mm) Throat plate Feed shaft Timing belt −...

  • Page 45: Feed Motor Origin Compensation

    Adjustment Procedures Results of Improper Adjustment (2) Adjusting the feed origin ™ Improper position of presser 1. Origin of lengthwise feed motor can be adjusted with memory (improper longitudinal position of switch level 2 presser arm as well) influences closing/opening of the needle 2.

  • Page 46: Disassembling/Assembling Procedure

    5. DISASSEMBLING/ASSEMBLING PROCEDURE (1) Disassembling/assembling the main shaft Procedures of disassembling/assembling General drawing of the main shaft Main motor Thread take-up lever (asm.) Coupling Idler (asm.) Main motor Bush − −...
  • Page 47 Procedures of disassembling/assembling 1. Removing the main shaft 1) Remove the face plate section referring to “(5) Disassemblint/assembling the face plate section”. 2) Loosen two coupling setscrews 1. (LOCKTITE is applied to setscrews 1.) 3) Loosen timing belt 2, remove timing belt 2 from main shaft sprocket 3 and loosen two main shaft sprocket setscrews 4.

  • Page 48: Replacing The Timing Belt (Main Shaft)

    (2) Replacing the timing belt (main shaft) Procedures of disassembling/assembling General drawing of the main shaft Main shaft intermediate bearing Thread take-up lever (asm.) Coupling Main shaft front bearing Bobbin winder wheel Main shaft intermediate bearing − −...
  • Page 49 Procedures of disassembling/assembling 1. Removing the timing belt 1) Loosen two coupling setscrews 1. (LOCKTITE is applied to setscrews 1.) 2) Loosen four main motor installing screws 2 and remove main motor 3. (When main motor 3 interferes with the presser lifter motor and it is difficult to remove it, loosen four setscrews in the presser lifter motor and slightly move the presser lifting motor to the side.) 3) Remove left side cover B 8, adjust the idler and loosen timing belt 4.

  • Page 50: Replacing The Timing Belt (Hook Driving Shaft)

    (3) Replacing the timing belt (hook driving shaft) Procedures of disassembling/assembling General drawing of the hook driving shaft Hand pulley Hook Hook driving shaft front bearing support Hand pulley Hook driving shaft unit Hook driving shaft rear 1.5 mm bearing 33 mm Flat section for hook driving shaft Hand pulley...
  • Page 51 Procedures of disassembling/assembling 1. Removing the timing belt 1) Remove the feed plate and the throat plate connection and loosen two setscrews 1 in the hook driving shaft bearing bush. 2) Tilt the machine head to the side and remove hook sleeve 2. 3) Loosen setscrew 4 in hook driving shaft bearing support 3 and draw backward the hook driving shaft unit.

  • Page 52: Adjusting The Timing Belt Of Main Shaft (Idler)

    (4) Adjusting the timing belt of main shaft (idler) Standard Adjustment Adjust so that the tension of timing belt of main shaft is 100 to 120N. Tension is increased. Tension is decreased. − −...
  • Page 53 Adjustment Procedures Results of Improper Adjustment 1. Lightly loosen idler fixing screw 1 and idler fulcrum hinge screw 2, and tighten idler fixing screw 1 in the state that idler 4 is placed to timing belt 5 by pressing with tension spring 3. Then fix idler fulcrum hinge screw 2.

  • Page 54: Disassembling/Assembling The Face Plate Section

    (5) Disassembling/assembling the face plate section Procedures of disassembling/assembling * Figure when removing as a set. − −...
  • Page 55 Procedures of disassembling/assembling 1. Disassembling the face plate section 1) Remove the face plate and the needle. 2) Loosen setscrews 3 and 4 in needle bar rocking frame fulcrum shaft 1 and rocking frame support shaft 2 and remove needle bar rocking frame 5. (Remove the needle bar and neel bar bracket together with needle bar rocking frame 5.) 3) Loosen two fixing screws 7 in the thread take-up lever attached to counter weight 6.

  • Page 56: Disassembling/Assembling The Needle Rocking Motor

    (6) Disassembling/assembling the needle rocking motor Procedures of disassembling/assembling Needle rocking mechanism drawing Needle rocking sensor Needle bar rocking frame Throat plate Needle Needle rocking motor unit − −...
  • Page 57 Procedures of disassembling/assembling 1. Removing the needle rocking motor 1) Remove the face plate section. (Refer to 5.- (5)) Disassembling/assembling the face plate section.) 2) Loosen setscrew 2 in needle bar rocking lever, rear 1. 3) Loosen two setscrews in thrust collar 3. 4) Draw out forward needle bar rocking shaft 4.

  • Page 58: Replacing The Cloth Cutting Knife Solenoid

    (7) Replacing the cloth cutting knife solenoid Procedures of disassembling/assembling Washer Cloth cutting knife solenoid single body − −...
  • Page 59 Procedures of disassembling/assembling 1) Remove the top plate cover. 2) Remove four setscrews 2 in solenoid installing base 1. 3) Loosen setscrew 4 in knife holder 3 and draw out gib-headed shaft 5 in the direction of arrow mark. 4) Lift upward cloth cutting knife solenoid 6, loosen screw 7 in the knife holder section, and remove knife holder 3.

  • Page 60: Replacing The Cloth Cutting Knife Solenoid Cushion

    (8) Replacing the cloth cutting knife solenoid cushion Procedures of disassembling/assembling 1 mm − −...
  • Page 61 Procedures of disassembling/assembling 1) Loosen with the spanner two nuts 2 assembled to the front and rear of cushion 1. 2) Cushion 1 is pasted to washer 3 with the both-side adhesive tape. Strip off the tape and wipe off neatly the plane of washer 3.

  • Page 62: Replacing The Knife Return Stopper

    (9) Replacing the knife return stopper Procedures of disassembling/assembling Knife bar Knife drive lever Knife bar turning stopper − −...
  • Page 63 Procedures of disassembling/assembling 1) Remove knife return spring 1 from spring bracket 2. 2) Loosen and remove nut 4 of knife return stopper 3. 3) Screw in knife return stopper 3 to the lower side and draw it out. * For the assembling procedure, perform it by reversing the aforementioned steps. (For the position of the stopper, refer to 3.-(5) Adjusting the stroke and the initial position of the cloth cutting knife.) −...

  • Page 64: Lubrication

    Oil pipe Decrease Oil amount Increase (3) Applying grease Section A : : JUKI exclusive grease (face plate section) Section B : : ESSO TEMPLEX (other than face plate section) 1) Main shaft components Section A : : JUKI exclusive grease −...

  • Page 65: Presser And Feed Components

    2) Presser and feed components Section A : : JUKI exclusive grease Section B : : ESSO TEMPLEX − −...

  • Page 66: Needle Bar Rocking Components

    3) Needle bar rocking components Section A : : JUKI exclusive grease − −...

  • Page 67: Needle Thread Trimmer Components

    4) Needle thread trimmer components Section B : : ESSO TEMPLEX − −...

  • Page 68: Cloth Cutting Knife Components

    5) Cloth cutting knife components Section A : : JUKI exclusive grease Section B : : ESSO TEMPLEX − −...
  • Page 69 − −...

  • Page 70: Operation Panel

    7. OPERATION PANEL (1) Structure of the operation panel There are 3 states below according to back-light colors. Blue : Input mode ..Data change is possible. Green : Sewing mode ..Sewing possible state Yellow : Error state ..Some error occurs. −...
  • Page 71 Operation panel function list FUNCTION NAME FUNCTION NAME This key selects overedging width LCD display Various data such as pattern No., OVEREDGING display. shape, etc. are displayed. WIDTH key READY key Press this key when starting sewing. BAR-TACKING This key selects left side of bar-tacking Every time this key is pressed, change- WIDTH, LEFT key width compensation display.

  • Page 72: Initial Value Data For Each Shape Table

    − −...

  • Page 73: Various Data List

    8. VARIOUS DATA LIST (1) 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” cannot be selected at the time of your purchase.
  • Page 74 Item Setting range Edit unit Remarks Compensation of bar-tacking width, right -1.00 to 1.00 0.05mm – This item adjusts right side outer shape of bar-tacking section in terms of overedging section. Top of Bottom of Bottom of square square type straight bar- type tacking...
  • Page 75 Item Setting range Edit unit Remarks 1st clearance 0.0 to 4.0 0.1mm – This item sets the clearance between 1st bar-tacking and knife groove. This item is applied to all shapes. 2nd clearance 0.0 to 4.0 0.1mm – This item sets the clearance between 2nd bar-tacking and knife groove.This item is applied to all shapes.
  • Page 76 Item Setting range Edit unit Remarks Compensation of right side position of -2.0 to 2.0 0.1mm *2, *3 basting This item sets the amount to move the sewing reference position of basting from the center of right overedging to the right or left. Speed setting of basting 400 to 4200 100rpm...
  • Page 77 Item Setting range Edit unit Remarks ACT timing adjustment at the start of 1st bar- -5 to 5 1 stitch tacking This item adjusts needle thread tension output start timing at 1st bar-tacking section. ACT timing adjustment at the start of right -5 to 5 1 stitch overedging...
  • Page 78 Item Setting range Edit unit Remarks Knife motion – – – This item sets "With/without motion" of normal cloth cutting knife. : N o r m a l k n i f e : N o r m a l k n i f e motion OFF motion ON Knife motion at 1st cycle of double stitching...

  • Page 79: Memory Switch Data List

    (2) 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 0 to 17.0...
  • Page 80 Item Setting range Edit unit Initial value Cloth cutting knife size 3.0 to 32.0 0.1mm 32.0mm Input knife size used. Function of plural motions of cloth cutting knife – – Ineffective Ineffective/effective Ineffective Effective Function of thread breakage detection – –...
  • Page 81 2) Level 2 Press key for three seconds and it is possible to edit. Item Setting range Edit unit Initial value Pedal selection – – 2-pedal Pedal type is set. / 3. How to use the pedal (Refer to Instruction Manual.) 2-pedal 1-pedal 1-pedal...
  • Page 82 Item Setting range Edit unit Initial value Knife solenoid lifting time setting 5 to 100 Knife cylinder lowering time (Optional) 5 to 300 Y-feed motor origin compensation -120 to 400 1 pulse (0.025mm) Needle-rocking motor origin compensation -10 to 10 1 pulse (0.05mm) Presser lifter motor origin compensation...

  • Page 83: Explanation Of Shape

    9. EXPLANATION OF SHAPE (1) Square type (2) Round type S02 : Cloth cutting length S02 : Cloth cutting length S03 : Knife groove width, right S03 : Knife groove width, right – + + – S04 : Knife groove width, left S04 : Knife groove width, left S05 : Overedging width, left S05 : Overedging width, left...
  • Page 84 (5) Radial straight bar-tacking type (6) Radial flow bar-tacking type S02 : Cloth cutting length S02 : Cloth cutting length S03 : Knife groove width, right S03 : Knife groove width, right S04 : Knife groove width, left S04 : Knife groove width, left S05 : Overedging width, left S05 : Overedging width, left S07 : Pitch at parallel section...
  • Page 85 (9) Eyelet straight bar-tacking type (10) Eyelet flow bar-tacking type S02 : Cloth cutting length S02 : Cloth cutting length S03 : Knife groove width, right S03 : Knife groove width, right S04 : Knife groove width, left S04 : Knife groove width, left S05 : Overedging width, left S05 : Overedging width, left S07 : Pitch at parallel section...
  • Page 86 (13) Semilunar square type (14) Semilunar straight bar-tacking type S02 : Cloth cutting length S02 : Cloth cutting length S03 : Knife groove width, right S03 : Knife groove width, right S04 : Knife groove width, left S04 : Knife groove width, left S05 : Overedging width, left S05 : Overedging width, left S07 : Pitch at parallel section...
  • Page 87 (17) Eyelet round type (18) Square radial type S02 : Cloth cutting length S02 : Cloth cutting length S03 : Knife groove width, right S03 : Kinfe groove width, right S04 : Knife groove width, left S04 : Knife groove width, left S05 : Overedging width, left S05 : Overedging width, left –...
  • Page 88 (22) Square flow bar-tacking type (21) Square straight bar-tacking type S02 : Cloth cutting length S02 : Cloth cutting length S03 : Knife groove width, right S03 : Knife groove width, right S04 : Knife groove width, left S04 : Knife groove width, left –...
  • Page 89 (25) Semilunar radial type (26) Semilunar round type S02 : Cloth cutting length S02 : Cloth cutting length S03 : Knife groove width, right S03 : Knife groove width, right S04 : Knife groove width, left S04 : Knife groove width, left S05 : Overedging width, left S05 : Overedging width, left S07 : Pitch at parallel section...
  • Page 90 (29) Bar-tacking, left cut (30) Bar-tacking, center cut S02 : Cloth cutting length S02 : Cloth cutting length S03 : Knife groove width, right S03 : Knife groove width, right S22 : 1st clearance S04 : Knife groove width, left S22 : 1st clearance S23 : 2nd clearance S86 : Pitch of going...

  • Page 91: Detailed Explanation Of Continuous Stitching

    10. DETAILED EXPLANATION OF CONTINUOUS STITCHING * The figure below is an example for reference when the presser of feed 120 mm is used. For the details, refer to the item “(1) Points of replacement of the feed for 70 mm or 120 mm in 14. OTHERS.

  • Page 92: Error Code List

    11. ERROR CODE LIST Error code Display Description How to recover Place of recovery Contact of initialization of EEP-ROM of MAIN CONTROL p.c.b. E001 Turn OFF the power. When data is not written in EEP-ROM or data is broken, data is automatically initialized and the initialization is informed.
  • Page 93 Error code Display Description How to recover Place of recovery Presser size over of basting E492 Possible to re-enter after Sewing data edit screen When stitching data of basting exceeds presser size. pressing reset key. [S40] Basting needle entry compensation Presser size over of tie stitching at sewing end E493 Possible to re-enter after...
  • Page 94 Error code Display Description How to recover Place of recovery Abnormality of solenoid power E904 Turn OFF the power. When solenoid power of servo control p.c.b. fluctuates ±15% or more. Abnormality of temperature of heat sink for servo control p.c.b. E905 Turn OFF the power When temperature of heat sink of servo control p.c.b.

  • Page 95: Electrical Components

    32k byte EEPROM is mounted as standard. However, when a larger capacity is required in case of the external input or the like, it can be upgraded to 128k byte EEPROM. Capacity Name of part JUKI Part No. Remarks 32k byte HN58C256AP-10 (HITACHI)

  • Page 96: Adaptation To The Pk Pedal

    (4) Adaptation to the PK pedal PK pedals below can be connected to the machine. Name of part JUKI Part No. Remarks PK-51 GPK510010B0 2-pedal type for standing work PK-57 GPK570010B0 1-pedal 2-step type for standing work When using PK pedal, the relay cord below is necessary.

  • Page 97: Fuse List

    (5) Fuse list Fuse list mounted on the respective printed circuit boards in the control box is shown in the table below. Location Kind JUKI Part No. Remarks SDC p.c.b. F1 250V/5A time-lag fuse ø5.2 X L20 HF0013050P0 For stepping motor/knife solenoid...

  • Page 98: Gauge Components And Optional Components

    13. GAUGE COMPONENTS AND OPTIONAL COMPONENTS (1) Cloth cutting knife : Mounted on machine : Accessories (FOR LBH-1790S) A : Knife size (inch) B : Knife size (mm) C : Mark D : Part No. Remarks B2702047F00 B2702047K00A 7/16 11.1 B2702047I00 12.7 B2702047L00A...
  • Page 99 (5) Non-lubrication hook Part No. Name of part Q’ty Remarks 40006345 RP hook (asm.) Complete dry-head machine is 40006349 RP bobbin case produced by installing non-lubrication 13729603 Hook sleeve (asm.) hook. (Max. sewing speed reaches SS8660612TP Setscrew 3,300 rpm.) (6) Electric bobbin winder Part No.

  • Page 100: Others

    14. OTHERS (1) Points of replacement for feed 70 mm and 120 mm 1) Replacement parts for feed 70 mm and 120 mm Part No. Name of part Q’ty Remarks 40006335 Presser arm 120 Common to 70 mm and 120 mm 40006340 Presser arm spacer Not necessary when using 120 mm presser...
  • Page 101 2) Replacing and assembling procedure of the parts 1. Turn OFF the power switch of the sewing machine. 2. Remove the needle and the cloth cutting knife from the sewing machine. 3. Remove presser roller installing base @0 0 . (Remove setscrews @1 as shown in the figure below.) 4.

  • Page 102: Troubles And Corrective Measures

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  • Page 111: With Regard To Mechanical Components

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  • Page 112: With Regard To Electrical Components

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  • Page 128: Time Chart

    4 Trimming position !3 Trimming position 3 Waiting position !2 Waiting position 2 Roll-in at sewing !0 Small amount start position open position Trimmer open position 1 M e c h a n i c a l !1 Trimmer open connection cut- position off position...
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  • Page 130: Circuit Diagram

    17. CIRCUIT DIAGRAM (1) Block diagram A (3-phase 200 to 240V) – 125 –...

  • Page 131: Block Diagram B (Single Phase 230V (For Ce))

    (2) Block diagram B (Single phase 230V (for CE)) – 126 –...

  • Page 132: Block Diagram C (Single Phase 220 To 240V)

    (3) Block diagram C (Single phase 220 to 240V) – 127 –...

  • Page 133: Power Circuit Diagram (3-Phase 200 To 240V)

    (4) Power circuit diagram (3-phase 200 to 240V) – 128 –...

  • Page 134: Power Circuit Diagram (Single Phase 220 To 240V)

    (5) Power circuit diagram (Single phase 220 to 240V) – 129 –...

  • Page 135: Power Circuit Diagram (Single Phase 100V)

    (6) Power circuit diagram (Single phase 100V) – 130 –...

  • Page 136: Servo Motor Circuit Diagram

    (7) Servo motor circuit diagram – 131 –...

  • Page 137: Stepping Motor/Solenoid Circuit Diagram

    (8) Stepping motor/solenoid circuit diagram – 132 –...

  • Page 138: Head Sensor Circuit Diagram

    (9) Head sensor circuit diagram – 133 –...

  • Page 139: Pedal Switch Circuit Diagram

    (10) Pedal switch circuit diagram – 134 –...

  • Page 140: Connection Circuit Diagram Between Control Box And Head

    (11) Connection circuit diagram between control box and head – 135 –...

  • Page 141: Drawing Of The Table

    18. DRAWING OF THE TABLE – 136 –...
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  • Page 143 INITIAL VALUE DATA FOR EACH SHAPE TABLE Item Unit Shape selection Level 3 (30 shapes) Shape selection Level 2 (20 shapes) Shape selection Level 1 (12 shapes) Sewing shape Cloth cutting length 12.7 12.7 12.7 12.7 12.7 12.7 12.7 12.7 12.7 12.7 12.7...
  • Page 144 ＊ The description covered in this engineer's manual is subject to change for improvement of the TELEX : J22967 commodity without notice. Copyright c 2003 JUKI CORPORATION. All rights reserved throughout the world. 03 · 01 Printed in Japan (E)

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