JUKI LK-1900B series Engineer'S Manual Download Page 1

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40145045

No. E414-03

ENGINEER’S MANUAL

LK-1900B Series

Computer-controlled High-speed Bartacking Machine

(LK-1900B, LK-1901B, LK-1902B, LK-1903B, LK-1900BB, LK-1903BB,

LK-1900BN, LK-1901BN, LK-1902BN, LK-1903BN, LK-1900BNB,

LK-1903BNB)

Summary of Contents for LK-1900B series

Page 1: ...o E414 03 ENGINEER S MANUAL LK 1900B Series Computer controlled High speed Bartacking Machine LK 1900B LK 1901B LK 1902B LK 1903B LK 1900BB LK 1903BB LK 1900BN LK 1901BN LK 1902BN LK 1903BN LK 1900BNB LK 1903BNB ...

Page 2: ...nd other important information which are not covered in the Instruction Manual When carrying out the maintenance work on the sewing machine be sure to refer also to the Instruction Manual and the Parts List In addition for the motor for the sewing machine with thread trimmer refer to the separate Instruction Manual or This manual gives the Standard Adjustment on the former page under which the mos...

Page 3: ...needle changing bobbin changing or oiling and cleaning Electrical shock danger label DANGER This indication is given where there is an immediate danger of death or serous injury if the person in charge or any third party mishandles the machine or does not avoid the dangerous situation when operating or maintaining the machine WARNING This indication is given where there is a potentiality for death...

Page 4: ...death JUKI assumes no responsibility for damages or personal injury or death resulting from the machine which has been modified or altered Education and training 1 In order to prevent accident resulting from unfamiliarity with the machine the machine has to be used only by the operator who has been trained educated by the employer with respect to the machine oper ation and how to operate the machi...

Page 5: ...arth cable in order to prevent accident caused by earth leakage IV Motor 1 Be sure to use the specified rated motor JUKI genuine product in order to prevent accident caused by burnout 2 If a commercially available clutch motor is used with the machine be sure to select one with an entan glement preventive pulley cover in order to protect against being entangled by the V belt Before operation 1 Be ...

Page 6: ...nt that can result in personal injury or death 9 Be sure to periodically clean up the air vent of the fan and inspect the area around the wiring in order to prevent fire accident of the motor 10 In order to prevent accidents resulting in personal injury or death adjustments have to be carried out within the instructions described in this Engineer s Manual and in the Instruction Manual by the perso...

Page 7: ... to protect against accident that can result in personal injury In addition be sure to select appropriate tools 3 In prevention of accident that can result in personal injury make sure after the completion of adjust ment work that neither screws nor nuts are loosened or come in contact with other parts 4 Turn OFF the power before starting the work in order to protect against accident that can resu...

Page 8: ...ine parts when replacing any of the machine parts JUKI assumes no responsibility for any accident caused by any part other than JUKI genuine one In addition in the event you cannot replace parts within the specified range immediately stop the re placement work and ask JUKI or distributor in your area for replacement of the parts 8 If the fuse has blown be sure to turn the power off and eliminate t...

Page 9: ...specified After the completion of assembly work be sure to check that screws and nuts are not loosened before starting test run 6 In prevention of accident that can result in personal injury make sure after the completion of adjust ment work that neither screws nor nuts are loosened or come in contact with other parts 7 Make sure after the completion of replacement work that neither connectors nor...

Page 10: ...certaining that there is no interfering thing under the needle when winding the bobbin thread In addition never put your hair close to the machine during thread trimming 5 Feeding frame automatically comes down when pattern is changed ready key is ON Presser switch is ON intermediate presser button is ON and bobbin winder button is ON To prevent possible accidents caused by abrupt start of the sew...

Page 11: ...temperature of a part of the machine body or the rear side of operation panel rises higher by 15 C than the environmental temperature and you may feel the heat from the part However this phe nomenon is not abnormal and does not affect the components or the like 18 Do not lubricate the machine oil to the places other than the oil tank and the hook sec tion The grease lubricating system except the h...

Page 12: ...hine from the power supply It is also used as the emer gency stop switch Selection of the power switch Use the IEC60204 1 compliant power switch with rated current of 20 A or more and short circuit breaking capacity of 120 A or more which has the operating section in red against the yellow background Eye protection cover This is a cover for protecting eyes from being injured by a broken needle Fin...

Page 13: ...t of the position of the X feed motor and the Y feed motor Adjustment of the backlash of the driving gear 38 27 Installing the feed plate support plate 40 28 Installation of the feeder bar rear cover 40 29 Adjustment of the bobbin winder driving wheel position 42 30 Adjustment of the bobbin winder amount 42 31 Adjustment of the shuttle upper spring position Except for LK 1900B BS 1900B BF 1903B BS...

Page 14: ...oler turns ON while machine is running 109 7 Table of the work clamp foot 110 10 Maintenance 112 1 Replacing the fuse 112 2 100V specification changeover 112 3 Greasing parts 113 4 Parts to which grease is applied 114 5 Grease up procedures for the specified position 122 11 Error list 123 12 Troubles and corrective measures 128 1 Mechanical parts 128 2 Sewing conditions 130 3 Electrical components...

Page 15: ...um grease 2 Templex N3 3 JUKI Grease A Caution 2 20 Memory medium Memory of MAIN board 80 Kbyte 21 Number of stitches that can be stored in memory Max 20 000 stitches 22 Enlarging Reducing facility X Direction Y Direction 20 to 200 each 1 step 23 Enlarging Reducing method Pattern enlargement reduction can be done by increasing decreasing the stitch length 24 Sewing speed limitation 400 to 3 200 st...

Page 16: ...be stored in memory Max 20 000 stitches 22 Enlarging Reducing facility X Direction Y Direction 20 to 200 each 1 step 23 Enlarging Reducing method Pattern enlargement reduction can be done by increasing decreasing the stitch length 24 Sewing speed limitation 400 to 3 200 sti min 100 sti min step 400 to 2 700 sti min 100 sti min step 25 Material clawing amount 26 Pattern selector facility Standard p...

Page 17: ...ease 1 Penetration No 2 lithium grease 2 Templex N3 3 JUKI Grease A Caution 2 20 Memory medium Memory of MAIN board 80 Kbyte 21 Number of stitches that can be stored in memory Max 20 000 stitches 22 Enlarging Reducing facility X Direction Y Direction 20 to 200 each 1 step 23 Enlarging Reducing method Pattern enlargement reduction can be done by increasing decreasing the stitch length 24 Sewing spe...

Page 18: ...Max 20 000 stitches 22 Enlarging Reducing facility X Direction Y Direction 20 to 200 each 1 step 23 Enlarging Reducing method Pattern enlargement reduction can be done by increasing decreasing the stitch length 24 Sewing speed limitation 400 to 3 200 sti min 100 sti min step 400 to 2 700 sti min 100 sti min step 25 Material clawing amount 26 Pattern selector facility Standard pattern 50 34 User pa...

Page 19: ... 5 2 Configuration 1 Names of main unit Sewing machine head Work clamp foot Thread stand Operation panel Power switch Control box Pedal switch Power switch EU Type Operation panel NFC Type ...

Page 20: ...his key is used to move the feed forward on a stitch by stitch basis No NAME FUNCTION EDIT key This key is used to display the edit screen to select the item or to display the detail screen RETURN key This key is used to return the screen to the previous one DIRECT PATTERN This key registers the pattern When this key is pressed the pattern registered here can sew immediately X Y scale sewing posit...

Page 21: ...a This key is used to move the feed forward on a stitch by stitch basis No NAME FUNCTION EDIT key This key is used to display the edit screen to select the item or to display the detail screen RETURN key This key is used to return the screen to the previous one DIRECT PATTERN P1 P2 P3 P4 P5 This key registers the pattern When this key is pressed the pattern registered here can sew immediately X Y ...

Page 22: ...st setscrew should be removed completely from the flat part of the main shaft 3 Remove the main shaft motor Refer to 3 3 Removal of the main shaft motor and coupling 4 Loosen the two setscrews Pay attention to possible injury at that time because the balancer begins to turn when the setscrew is loosened 5 Loosen the two setscrews At that time the first setscrew of the setscrew should be removed co...

Page 23: ... Same procedures followed hereafter 4 Tighten the two each setscrews and respectively Make sure that the first screw touches flatly on the main shaft 5 Push the hand pulley in the direction of the arrow F so that the hand pulley gear A is meshed with that the hand pulley gear B In this state fix the pulley with the two setscrews 6 Mount the main shaft motor and the coupling Refer to 3 2 Removal of...

Page 24: ... two setscrews on the main shaft side of the coupling Then remove the four motor setscrews 2 To remove the coupling from the main shaft motor loosen the two setscrews on the main shaft side Caution Turn the main shaft in the direction of forward rotation A The screw hole that can be seen first is the No 1 screw Loosen the screws starting with the No 2 screw Tightening should be done starting with ...

Page 25: ... be positioned in the lateral direction 2 Incorporation of the coupling in the main shaft motor 1 Provide a clearance of 0 5 mm between the coupling and the main shaft motor 2 Apply the No 1 screw of the coupling to the shaft flat section of the main shaft motor and fix it 3 Meshing of the coupling 1 Apply the setscrew No 1 screw of the main shaft motor side to the section between the two set scre...

Page 26: ... plate 2 Loosen the two setscrews two setscrews and the two setscrews At that time the second screws should be loosened first for the setscrews and The first screws of the setscrews and should be arranged so that they can come completely off the flat section of the oscillator shaft 3 Pull out the oscillator shaft in the direction of the arrow A 4 Remove the main shaft according to 3 1 Main shaft c...

Page 27: ...ews and then fix them so that the crank rod unit is not displaced from the center of swinging Tighten the first screw first so that it comes in contact flatly with the main shaft Then tighten the second one 6 Mount the lengthwise feed motor and the crosswise feed motor mounting plate using the two setscrews and four setscrews Refer to 3 26 Adjustment of the position of the X feed motor and the Y f...

Page 28: ...al condition Axial direction Keep the close contact with the main shaft eccentric cam and the crank balancer 5 Lower shaft backlash adjustment and connection disconnection WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment 1 Size of lower shaft backlash is 0 1 mm at the tip of the driver The shaft is requi...

Page 29: ...ts of Improper adjustment 1 Lower shaft backlash 1 Loosen the two setscrews 2 Turn the lower shaft rear metal in the direction of the arrow and adjust the backlash keeping the metal to contact closely with Face A Size of backlash is 0 1 mm at the tip of the driver The shaft is required to rotate smoothly 3 Tighten the two setscrews Caution When eliminate the backlash the direction of rotation shou...

Page 30: ...d adjustment 1 When the oscillator is lightly swung by a finger in the direction of the arrow the oscillator is fixed in the center position of swinging 7 Adjustment of hook oil amount WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment No 2 screw No 1 screw B 8 5 to 9 0 mm ...

Page 31: ... lower shaft gear according to 3 5 Lower shaft backlash adjustment and connection dis connection Caution 1 In the case of disassembly and adjustment grease up treatment is always needed for the specified places 2 positions and the gear area A of the os cillator 2 When the crank rod under cam is removed ac tions for oscillator gear positioning must be taken without fail Refer to 3 3 Crank connectin...

Page 32: ...pes Take them out of the oil tank 5 Release the cord clamp from the rear side of the bed of the oil drain pipe 6 Loosen the setscrew and take out the driver 7 Loosen the setscrew 8 Remove the setscrew and pull out the shuttle race adjust shaft 9 Pull the shuttle in the direction of the arrow C and take it out 9 Adjustment the height of the needle bar WARNING Turn OFF the power before starting the ...

Page 33: ...tion pipe to touch the needle thread clamp connector link 5 Bundle the needle thread clamp sensor cord the lubrication pipe and the oil drain pipe with the harness band 6 Pass the two lubrication pipes through the cord clamp and fix them with the setscrew 7 Insert the two lubrication pipes part B in the oil tank Fix the oil tank to the frame with the setscrew 8 Fix the oil drain pipe to the rear s...

Page 34: ... 20 10 Hook adjustment WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment For DP 17 For DP 5 0 05 to 0 1 mm ...

Page 35: ...he needle as the front end face of driver receives the needle to prevent the needle from being bent Then tighten setscrew of the driver 4 Loosen setscrew of the shuttle and adjust the longitudinal position of the shuttle To do this adjustment turn shuttle race adjusting shaft clockwise or counterclockwise to provide a 0 05 to 0 1 mm clearance between needle and the blade point of inner hook 5 Afte...

Page 36: ... motor shaft seem to be tightly coupled Pull out the motor shaft in the direction of the arrow straightforward in order not to hurt the bearing At that time the cam may come down Handle it with care not to damage it 12 Thread trimmer work clamp foot origin sensor adjustment WARNING As the work is performed while the power is ON never touch the switches other than the necessary one so as to prevent...

Page 37: ...clamp foot origin sensor adjustment and make sensor adjust ments Adjustment procedures Results of Improper adjustment 1 Start the check program 06 2 Tread on the pedal for the retrieval of the thread trimmer work clamp foot lifter cam origin 3 Using a bar or the like confirm that the standard holes A and B of the sewing machine frame coincide with the standard hole C of the thread trimmer and work...

Page 38: ...s 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 Standard adjustment After the completion of origin retrieval in the check program 06 Start Switch ON pressing the minus key of the DATA CHANGE key in the range of 6 to 8 times will turn off the thread trimmer sensor The display at the operation pa...

Page 39: ...stment 3 Press the minus key of the DATA CHANGE key Con firm that the display of the operation panel is changed over from when the key is pressed within the range of 6 to 8 times 4 If the display changeover occurs deviating from the range of 6 times to 8 times or if the display changeover does not occur at all loosen the setscrew and make fine adjustments of the sen sor slit in the directions of t...

Page 40: ...andby state the distance from the throat plate to the tip of the thread trimmer lever small is 18 5 mm 16 Adjustment of the height of the moving knife and counter knife WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment Moving knife The amount of mesh of the needle hole guide with the moving knife is 0 15 ...

Page 41: ...he above illustration If the height seems to be inade quate select and use the parts as specified below Part No Name of part Thickness B242328000A Moving knife washer 0 4 mm B242328000B Moving knife washer 0 5 mm B242328000C Moving knife washer 0 6 mm B242328000D Moving knife washer 0 7 mm B242328000E Moving knife washer 0 8 mm B242328000F Moving knife washer F 0 65 mm B242328000G Moving knife was...

Page 42: ...thread uniformly the blade face of the counter knife is made to have an inclination of 0 2 mm 18 Floating amount of the thread tension disk WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment When the sewing machine power supply is turned off AT solenoid is OFF the gap between AT thread tension discs is 0 6...

Page 43: ... the tension releasing pin adjust collar not to let it rotate and loosen the nut 4 Turn the tension releasing pin adjust collar and adjust the gap between the thread tension discs Adjustment of thread ten sion disc floating 5 Hold the tension releasing pin adjust collar and tighten the nut Mount the thread tension cap by means of the setscrew 6 Turn on the power supply and set up the thread tensio...

Page 44: ...ine Procedures of disassembling assembling 1 Loosen the setscrew 2 Remove the two setscrew 3 Move the AT link unit front downwards in the direction of the Arrow A and pull out the pin block from the hole of the thread tension releasing pin of the second thread tension 4 Pull out the second thread tension to remove it Arrow B 5 For reassembly follow the steps of 4 to 1 above ...

Page 45: ... cause of breaking the second thread tension 2 When tightening the setscrew this fixing action should be taken after the AT link unit front has been moved to the left side in the direction of the arrow C If it is not moved to the left side in the direction of the arrow C the amount of tension disc floating may fail to be adjusted normally 3 After reassembly follow the steps for the adjustment of t...

Page 46: ...ection disconnection 2 Draw out the cotter pin from the pin block of the AT link unit rear Be careful not to drop the washer at that time Work becomes easier if the main shaft motor is removed 3 Lift the joint block of the AT unit upwards and take it off the pin block of the AT link unit rear 4 Draw out the AT link unit front from the plane side in the direction of the arrow E and remove it 5 Remo...

Page 47: ...on the parallelism of the two front and rear joint block must also be se cured without fail If the correct distance and parallelism are lost this can be a cause of AT malfunction and normal sewing tension cannot be obtained 3 Upon the completion of all reassembly work confirm that there is a close contact between the thrust collar and the AT solenoid unit If any clearance is perceived loosen the t...

Page 48: ...er is ON never touch the switches other than the necessary one so as to prevent accidents caused by the malfunction of switches Standard adjustment Work feed plate A 147mm LK 1900B 1902B 1900BN 1902BN 146mm LK 1901B 1903B 1901BN 1903BN B 61mm LK 1900B 1902B 1900BN 1902BN 62mm LK 1901B 1903B 1901BN 1903BN C 74mm LK 1900B 1902B 1900BN 1902BN 73mm LK 1901B 1903B 1901BN 1903BN A B 🅐 Remarks The descri...

Page 49: ... cal feed fulcrum shaft are aligned on a straight line 3 Adjustments should be carried out according to 3 22 Adjust ment of the Y origin and 3 23 Adjustment of the X origin o The maximum area cannot be secured Adjustment procedures Results of Improper adjustment 1 Select the check program 02 Refer to 6 3 X Y motor origin adjustment 2 Adjust the origin to be the dimensions that were described in 3 ...

Page 50: ...event accidents caused by the malfunction of switches Standard adjustment 24 Adjustment of the wiper position WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment 1 5 mm or more A B 🅐 Remarks The description only uses the panel diagram of the standard specification ...

Page 51: ...the distance A between the wiper end plane and the needle center until this distance attains the values specified below After adjustments tighten the screw firmly Distance A between the needle center and the wiper end plane A mm Other than LK 1903B 1903BN 23 to 25 mm LK 1903B 1903BN only 15 to 17 mm The needle stays in the position of the end of sewing and stop o If Distance A is too small the wor...

Page 52: ...6 Adjustment of the position of the X feed motor and the Y feed motor Adjustment of the backlash of the driving gear WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment 1 Fix the Y feed motor by pressing it in the direction of the arrow C 2 Fix the X feed motor by pressing it in the direction of the arrow B...

Page 53: ...ent needle thread castoff may occur 3 If the wiper spring position is inadequate the needle thread cannot be held correctly and this can be a cause of needle breakage Adjustment procedures Results of Improper adjustment 1 Loosen the two setscrews and four setscrews of the Y feed motor and the two setscrews of the X feed motor mounting plate 2 Pressing it in the direction of the arrow C tighten the...

Page 54: ...r rear cover WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment The clearance between the feeder bar rear cover and the upper surface of the work feed presser plate is about 1mm When the feeder bar is moved in the direction of the arrow A there must be a clearance at the notch part of the sewing machine fr...

Page 55: ...sser plate Then tighten the two setscrews 3 Move the feeder bar in the direction of the arrow A and con firm that there is a clearance at the notch part of the sewing ma chine frame If there is no clearance and there is interference with the sewing machine frame the steps of 1 to 2 above should be repeated again Caution When tightening the setscrews the feeder bar rear cover may be moved verticall...

Page 56: ... the sewing machine frame 30 Adjustment of the bobbin winder amount WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment The position of the bobbin winder lever is based on the standard that it is 14 mm apart from the bobbin winder shaft Try to perform bobbin winding actually and make fine adjustments in the...

Page 57: ...the bobbin winder lever 2 Start the sewing machine and wind the thread at the bobbin wind er Confirm the amount of winding 1 If the amount of winding seems to be too much adjust the bobbin winder lever in the direction of the arrow A 2 If the amount of winding seems to be too less adjust the bobbin winder lever in the direction of the arrow B 3 If the winding state of the thread around the bobbin ...

Page 58: ... A Caution If Part B is damaged this is the cause of thread breakage hangnail of thread stain on thread etc Therefore this part should be polished by the use of a buff or the like In par ticular the rear side should be handled with care For the LK 1900B BS 1900B BF 1903B BS 1900BN BS 1900BN BF and 1903BN BS refer to section 3 41 32 Shuttle felt WARNING Turn OFF the power before starting the work s...

Page 59: ...il to hook the needle thread o Too much motion to the rear side will cause the moving knife to fail to hook the needle thread o Too much motion to the left side will cause the moving knife to fail to hook the bobbin thread Adjustment procedures Results of Improper adjustment 1 If the shuttle felt seems to be protruded or it has been replaced with a new one push it in by means of tweezers or the li...

Page 60: ...If wear seems to be too much around the pointed tip of the inner hook release the inner hook presser and confirm that the di mensions of the hatched area on the rear side are 0 3 x 8 mm 34 Adjustment of the thread take up spring WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment Dimension A ...

Page 61: ...kwise will increase the moving amount and the thread drawing amount will increase 2 Adjusting the pressure To change the pressure of the thread take up spring insert a thin screwdriver into the slot of thread tension post while screw is tightened and turn it Turning it clockwise will increase the pressure of the thread take up spring Turning it counterclock wise will decrease the pressure Example ...

Page 62: ...Procedures of disassembling 1 Remove the hinge screw If the hinge screw cannot be seen from the open part of the needle thread clamp device try to move the needle thread clamp connector link by hand in the direction of A or B 2 Remove the three LK 1900BB 1903BB 1900BNB 1903BNB four setscrews of the needle thread clamp base and take out the needle thread clamp device Open part LK 1900BB 1903BB 1900...

Page 63: ...ould occur slightly move the needle thread clamp device behind in the direction of the arrow A and make readjustment from step 3 above 5 Confirm that the distance between the needle thread clamp release plate and center of the needle is A 2 0 2 mm and B 2 0 2 mm LK 1900BB 1903BB 1900BNB 1903BNB A 2 0 3 mm B 2 0 5 mm respectively 6 If the distance seems to be inadequate loosen the three setscrews a...

Page 64: ...ction of switches Standard adjustment When the needle thread clamp release plate is withdrawn by 30 pulses LK 1900BB 1903BB 1900BNB 1903BNB 32 pulses from the standby position the clearance A between the needle thread clamp release plate and the needle thread clamp becomes zero 0 🅐 LK 1900BB 1903BB 1900BNB 1903BNB Short tail application A Remarks The description only uses the panel diagram of the ...

Page 65: ...is found to be inadequate adjust the position toward the needle according to 3 35 Needle thread clamp device connection disconnection Since then perform the above adjustments again Caution If the reference position is established at a wrong position E929 Needle thread clamp motor displacement error can occur In the case a loss of synchronism occurs correctly adjust the position of the origin not b...

Page 66: ... base becomes 22 mm common to S and H type LK 1900BB 1903BB 1900BNB 1903BNB 20mm 1 Needle thread clamp notch R position 1 When the needle thread clamp link asm is pushed in Direction A and Part B of the needle thread clamp support plate asm and the needle thread clamp begins to open the dis tance between the needle thread clamp and the needle thread clamp base becomes 17 5 mm common to S and H typ...

Page 67: ...adjusted improperly o The notch position cannot stay in the standard range even after the adjustment of the needle thread clamp sensor according to 36 Adjustment of the needle thread clamp reference position LK 1900BB BNB o If the distance is too long between the needle thread clamp and the needle thread clamp base needle thread can not be held during sewing As a result needle thread trimming fail...

Page 68: ...ing WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Standard adjustment 7 5mm B A Table 1 Part No Name of part Thickness B242328000A Moving knife washer 0 4 mm B242328000B Moving knife washer 0 5 mm B242328000C Moving knife washer 0 6 mm B242328000D Moving knife washer 0 7 mm B242328000E Moving knife washer 0 8 mm B2423280...

Page 69: ...ad trimming failure occurs replace the moving knife washer as a thicker ones The moving knife washer is a same washer with the main thread trimming device on the throat plate lower asm See 3 16 Adjustment of the height of the moving knife and counter knife o The position of the moving knife is decided by a countersink screw but when the moving knife is mounted aslant it does not engage with the co...

Page 70: ... switches other than the necessary one so as to prevent accidents caused by the malfunction of switches Standard adjustment Longitudinal direction as viewed from operator s side B A 1mm Lateral direction as viewed from operator s side Waiting initial position of cylinder Most advanced position of cylinder ...

Page 71: ...e Longitudinal position Center of distribution A B Lateral position 1 mm from the right hand edge of the hole of the suction pipe 4 When you cannot adjust it fully only in the adjustable range of setscrew loosen the fixed nut of the cylinder knuckle and tighten the fixed nut at the position which has been prop erly adjusted by making the cylinder knuckle move back and forth 5 After the adjustment ...

Page 72: ...enter of the needle and that of the groove width C For the front rear positioning join the rear end of the needle and the corner portion A 2 Lower thread holder LK 1903B BS The amount of overlapping with the shuttle upper spring should be adjusted so that cotton thread 30 can pass smoothly when it is pulled in the direction of the arrow E After the best positioning has been secured fasten the two ...

Page 73: ...osition of the shuttle upper spring can also change during hook adjustments Position adjustment for the shuttle upper spring should be done after the completion of standard 3 10 Hook adjustment without fail o If there is a front and rear dis placement or a right and left dis placement needle thread biting may occur into the hook o Too much motion to the rear side will cause the moving knife to fai...

Page 74: ...ing tension 1 How to adjust the tension of the an idling prevention spring 1 Remove the spring as illustrated below using an old sewing machine needle At this time hold the spring with your thumb to prevent it from jumping out 2 Adjust the spring pressure by changing the height of the arch of the spring 3 Set ear first and insert the sewing machine needle to push the central part of the spring the...

Page 75: ...he levels as follows 01 Memory switch 1 02 Counter setting 03 Standard pattern selection 04 Direct pattern registration 05 Pattern copy It can be used at the operator level 06 Direct pattern copy 07 Cycle pattern copy 08 Presser adjustment 09 Contrast setting 10 Ver display 11 Communication It can be used at the serviceperson level 1 12 USB format 13 Check program 14 Irregular operation setting 15...

Page 76: ...A CHANGE key is pressed it is possi ble to adjust the contrast in five steps until 4 darkest from 0 brightest 1 When MODE key is held pressed for three seconds 12 USB formatting is displayed on the mode screen 2 Selecting the item Press ITEM SELECT key to select 12 USB formatting and press EDIT key 3 Perform the format Insert the media into the USB thumb drive press READY key When formatting is co...

Page 77: ...key lock function enable disable screen When the DIPSW1 1 of MAIN board is OFF 14 Key lock setting is not displayed on the mode screen 2 Setting the enable disable of key lock function Enable disable of key lock function is selected with DATA CHANGE key Key lock is enabled Key lock is disabled When EDIT key is pressed selection screen of the item to be key lock is displayed 3 Selecting the item to...

Page 78: ...e key lock Pattern No Item data It can be individual setting Direct pattern data It can be individual set ting Memory switch 1 It can be individual setting Counter USB formatting Check program Used not used of standard pattern Pattern copy Direct pattern copy Cycle pattern copy Direct pattern registration ...

Page 79: ... individual selection screen is displayed Select the item with ITEM SELECT key It is possible to change enable disable of key lock with DATA CHANGE key When the setting is complete press RETURN key to display the mode screen Turn OFF the power and turn OFF the DIPSW1 1 of MAIN board 5 How to check the version information Each software version of panel sewing machine and SDC board can be confirmed ...

Page 80: ... is as follows Data name Display File name Description of data Vector form data VD00 XXX VDT Data on needle entry points created with the PM 1 The data form is commonly used among JUKI sewing machine Memory switch data LK00 XXX MSW Memory switch Level 1 Level 2 data All sewing machine data LK00XXX MSP All data maintained by the sewing machine Panel program data SP RVL 6 digits HED SP RVL 6 digits ...

Page 81: ...ey to select file num ber B to be read Press DATA CHANGE key to select file number C to be written Press READY key to write the data In the case that the type of communication is vector form data or memory switch data When READY key is pressed an hour glass is displayed When data writing is completed return to the file number selecting screen In the case that the type of communication is all sew i...

Page 82: ... displayed immediately after turning ON the power When MODE key is pressed in E704 version error screen change over to communication mode Then it is possible to rewrite the program When saving the data to the media save it in a directory configuration described below If the data is not saved to the correct folder file loading can not be performed Folder name Media LK1900B LK00 XXX MSW LK00 XXX MSP...

Page 83: ...B thumb drive no problem will occur 2 If two or more MAIN programs are saved on the USB thumb drive it will be unknown which one is written on the panel 3 The rewrite of the PANEL program starts when the power is turned on while P3 key is pressed 4 When the power is turned ON while the key is held pressed the RVL of the panel software is displayed on the welcome screen 5 When the power is turned O...

Page 84: ... for the Enabled or Disabled re striction of an NFC terminal 3 After pressing the you can change the state of Enabled ON or Disabled OFF of a restriction 4 Press the to fix the settings and press the to cancel it and then the current screen returns to the last first previous screen Registering an NFC terminal 1 Select the 17 NFC registration on the screen for a maintenance engineer or the servicep...

Page 85: ...displayed at the top and bottom of the character in the selection pro cess After pressing the you can change a character in the selection pro cess Press the to delete a charac ter in the selection process and hold it down for one second to delete all char acters 6 Press the after entry to display the NFC terminal registration screen Caution When you try to register a registered NFC terminal once a...

Page 86: ... an operating method refer to 4 7 5 Canceling the registration of a NFC terminal 1 Press the on the NFC ter minal registration screen to select the registered name of an NFC terminal to cancel 2 Press the to display the con firmation message screen for an NFC terminal registration cancelation 3 Press the to execute the can celation and press the to cancel it and then the current screen returns to ...

Page 87: ... which is displayed on the panel 1 Connect the media to the USB thumb drive Press ITEM SELECT key a few times pictogram of USB will be displayed In this state DATA CHANGE key is pressed it is possible to select the pattern No If pattern data size is 10Kbyte or more it is not pos sible to display the needle entry point diagram 2 If the pattern has been backed up to the sewing ma chine pattern displ...

Page 88: ...h 2 Then press EDIT key 3 To change the data In the memory switch data There are data items to change the value and to select the pictograph Data item to change the value is given a number such as K021 It is possible to change the setting value with DATA CHANGE key Data item to select the pictograph is given a number such as K0xx It is possible to select the pictograph with DATA CHANGE key Remarks...

Page 89: ...ad tension at the time of thread trimming 0 to 200 0 U009 Changeover timing of thread tension at the time of thread trimming 6 to 4 0 U010 Sewing speed of 1st stitch Without needle thread clamp Speed can be set in a unit of 100 sti min 400 to 1500 400 U011 Sewing speed of 2nd stitch Without needle thread clamp Speed can be set in a unit of 100 sti min 400 to 3200 900 For LK 1903BB set to 400 U012 ...

Page 90: ... side may cause needle breakage Be careful when sewing heavy weight material U037 State of work clamp foot after completion of sewing can be selected Work clamp foot goes up after moving at the sewing start Work clamp foot goes up immediately after the end of sewing Work clamp foot goes up by pedal operation after moving at the sewing start For LK 1903B BR35 set to U039 Execution of origin retriev...

Page 91: ... fan operation can be set Energy saving mode Constantly operates U075 With without air pressure detection Without air pressure detection With air pressure detection With air pressure detection Displayed only for the LK 1900BB 1903BB U076 Correction of thread waste retaining position With this switch the timing to start traveling from the thread clamping position to the thread releasing thread wast...

Page 92: ...simplified characters Chinese traditional Chinese Spanish Italian French German Portuguese Turkish Vietnamese Korean Indonesian Russian Arabic U245 Grease up needle 0 120000000 Stitches Cannot be set The number of stitches can be cleared by keeping the RESET key held pressed Refer to 10 5 Grease up procedures for the specified posi tion ...

Page 93: ... Enable disable selection of thread trimming jump feed control Disable Enable K045 Diameter of needle hole guide at the time of thread trimming jump feed control 1 6 to 4 0 mm 1 6 mm When the setting value is increased the amount of feeding becomes larger K047 Thread trimming can be disabled Normal Thread trimming disabled All thread trimming opera tion is disabled K052 Magnet wipe out time Settin...

Page 94: ...ble K092 Used to enable disable the feed forward travel function when checking the shape by means of the pulley Disable Enable K093 Returning method selection of standby position of the thread clamp Except for LK 1900BB and 1903BB LK 1900BB 1903BB Refuge position of sewing end is moved to standby position by the work clamp foot switch LK 1900BB 1903BB Refuge position of sewing end Standard model N...

Page 95: ...otor Wiper operation adjustment at the time of thread trimming while sewing a pattern Value of increase and decrease is set for the value of K066 Number of pulses for work clamp foot interlock wiper operation This function can be set up even for a standard machine 20 to 20 7 K102 LK 1903BB standard pattern limitation Select whether to use the patterns of two holes length wise three holes and four ...

Page 96: ... trimmed by the counter knife mounted on the rear side of needle hole guide The trimmed needle thread end is released with the memory switch U088 and sucked with U089 LK 1903B B 1903BN B Presser foot thread trimming motor Feed motor Thread clamp motor Thread waste suction nozzle Shorter thread remaining thread trimmer Thread waste suction mechanism Needle thread end is retained Needle thread end i...

Page 97: ...of K103 direct pattern Select a direct pattern and display S007 S002 operating keys Select Pattern type and No operating keys Caution If Pattern type No is changed other items enlargement reduction scale thread ten sion etc will be initialized ...

Page 98: ...ed is in reverse video it is possible to use the selected function Check item is seven items described below No Item name 01 Input signal check 02 X Y motor origin adjustment 03 Continuous operation 04 Main motor rpm check 05 Output check 06 Work clamp foot thread trimming motor origin adjustment 07 Needle thread clamp motor origin adjustment 08 Bird s nest short tail step mode 03 Continuous opera...

Page 99: ... pressed the screen returns to the check program screen No Sensor name Display No Sensor name Display No Sensor name Display 01 DIP switch 1 08 Analog pedal sensor 15 SDET sensor 02 DIP switch 2 09 AUDET sen sor 16 Head tilt switch 03 DIP switch 3 10 ADDET sen sor 17 Temporary stop switch 04 DIP switch 4 11 DDET sensor 18 Thread breakage detection switch 05 Start switch pedal 12 UDET sensor 19 Sew...

Page 100: ... key is pressed Y motor is driven in 0 1 mm steps Position information of the Y motor encoder is displayed in section B When READY key is held pressed for two seconds the motor position of current state will be X Y origin and position information of the X Y motor will be 0 Perform the origin retrieval of X Y motor by start switch 2 When RETURN key is pressed the screen returns to the check program...

Page 101: ...retrieval of the X Y work clamp foot thread trimmer needle thread clamp motor is conducted if origin retriev al enabled has been set In this case automatic sewing operation is restarted after the lapse of the rest time specified To stop continuous operation turn ON the Start SW during the rest time E050 Temporary stop error is displayed and operation is suspended Setting items are as follows 3 Whe...

Page 102: ...essing READY key 3 When RESET key is pressed sewing machine operation stops 4 When RETURN key is pressed the screen returns to the check program screen 1 Press ITEM SELECT key to select the setting item 2 While READY key is pressed the mate rial drawing magnet ON output is generated Setting items are as follows 3 When RETURN key is pressed the screen returns to the check program screen B A Setting...

Page 103: ...key to drive the work clamp foot thread trimming motor to each specified posi tion When ITEM SELECT key is pressed the driving direction of work clamp foot thread trim ming motor to each specified position is changed The arrow mark that is displaying the motor posi tion will change in the reverse direction Work clamp foot rising position Work clamp foot lowering position lowering position during p...

Page 104: ...played on the screen 1 Pressing the READY key will change the bird s nest short tail function to the step mode 2 Restore the sewing screen and press the READY key 3 Tread on the pedal to sew Sew Thread trim Stops before the bird s nest short tail action 4 Press the preparation key Pressing the READY key will cause ac tions in the following order 1 Suction nozzle is turned ON 2 Shorter thread remai...

Page 105: ...wer supply filter board for Europe Perform the noise reduction No Connector and fuse name Connection destination name Remarks CN1 Power switch Power inlet CN16 SDC board Power outlet F1 F2 F3 20A time lag fuse Non removable No Connector and fuse name Connection destination name Remarks CN1 Power switch Power inlet CN16 SDC board Power outlet F1 F2 20A time lag fuse Non removable ...

Page 106: ...8 Not used For CPU writing CN49 Not used For PLD writing CN50 Not used For DSP writing CN51 For option For temporary stop thread breakage detection DipSW1 1 For key lock setting Generally OFF Initialization Turn ON the DipSW1 4 Then turn ON the power while the pedal is depressed return to the factory setting all such as sewing data memory switch etc DipSW1 2 Not used Generally OFF DipSW1 3 Not use...

Page 107: ... For PLD writing CN50 Not used For DSP writing CN51 For option CN52 Air solenoid valve 2 For thread waste suction air CN53 Air cylinder sensor 1 For cylinder of shorter thread remaining thread trimmer side CN54 Air cylinder sensor 2 For cylinder of suction nozzle side CN55 Not installed DipSW1 1 For key lock setting Generally OFF Initialization Turn ON the DipSW1 4 Then turn ON the power while the...

Page 108: ...6 Power input CN17 Main motor power CN31 MAIN board power supply 2 DipSW2 1 Not used Generally OFF DipSW2 2 Not used Generally OFF DipSW2 3 Not used Generally OFF DipSW2 4 Not used Generally OFF F1 4A time lag fuse For 85V Not be replaced Direct mounting F2 2A fast blow type fuse For 24V fuse holder F3 20A time lag fuse For AC input Not be replaced Direct mounting F4 20A time lag fuse For AC input...

Page 109: ...ing position sensor CN73 Machine head safety switch CN75 X axis motor encoder CN76 Y axis motor encoder CN77 Needle thread clamp motor encoder 5 INT board asm The board is attached to the rear side of machine head relay connector of various sensors signal and EEPROM with machine head specification data is installed ...

Page 110: ...wise bar tacking 25 20 4 0 42 Lengthwise bar tacking 26 20 4 0 56 Lengthwise bar tacking 27 20 0 18 Lengthwise straight line bar tacking 28 10 0 21 Lengthwise straight line bar tacking 29 20 0 21 Lengthwise straight line bar tacking 30 20 0 28 Lengthwise straight line bar tacking 31 2 16 52 Semilunar bar tacking 32 2 10 63 Semilunar bar tacking 33 6 10 24 Semilunar bar tacking 34 6 12 31 Semilunar...

Page 111: ...ar tacking 23 Other side This side 28 20 4 0 9 10 24 Other side This side 36 20 4 0 9 10 25 Other side This side 42 20 4 0 9 10 26 Other side This side 56 20 4 0 9 10 Lengthwise linear bar tacking 27 Other side This side 18 20 0 11 28 Other side This side 21 10 0 29 Other side This side 20 0 30 Other side This side 28 20 0 Caution 1 Sewing size shows the dimensions when the scale rate is 100 2 For...

Page 112: ...0 48 No Stitch diagram Number of stitches Sewing size mm Caution 2 Work clamp foot No Lengthwise Crosswise Lengthwise bar tacking 41 29 20 2 5 12 42 39 25 2 5 12 43 45 25 2 5 12 44 58 30 2 5 12 45 75 30 2 5 12 46 42 30 2 5 12 Radial bar tacking 47 91 ø8 15 48 99 49 148 50 164 Caution 1 Sewing size shows the dimensions when the scale rate is 100 2 For work clamp foot No refer to 9 7 Table of the wo...

Page 113: ...57080BA E MAZ156080B0 C MAZ156080B0 C B25573720A0 Needle hole guide mm øB øC A Height of boss A 1 6 1 8 1 6 1 8 1 1 1 6 1 4 Outside diameter of boss B ø2 8 ø3 5 ø3 5 ø3 5 Diameter of hole C ø1 6 ø1 6 ø2 0 ø2 0 Part No MAZ15801000 MAZ15501000 14149603 MAZ15601000 MAZ15701000 14149900 D2426284Y00 Feed plate MAZ15502000 8 5 MAZ15602000 10 MAZ15702000 12 5 Items in are optional For common use Model na...

Page 114: ...6 12 40 6 6 29 10 10 13 41 8 8 30 49 5 5 5 3 0 2 5 14 10 10 31 8 8 8 15 42 6 6 32 50 5 5 5 16 43 8 8 33 8 8 8 17 10 10 Standard sewing lengths X and Y given above are given assuming that the scale is 100 Use the patterns No 34 to 50 with hole diameter ø1 5 mm or less In case of LK 1903BB 1900BNB pattern No 46 to 50 and No 23 to 33 does not display in the condition of delivery from the factory If y...

Page 115: ...k clamp foot slide plate asm 14121263 Slide plate for work clamp foot blank Work clamp foot blank t 3 2 With knurl Processed right Sewing area lengthwise 20 crosswise 40 14121701 With knurl Processed Left Sewing area lengthwise 20 crosswise 40 14121800 With knurl Processed right Sewing area lengthwise 30 crosswise 40 40021851 With knurl Processed Left Sewing area lengthwise 30 crosswise 40 4002185...

Page 116: ...3 A SM8040302TP B A 21 5 B 35 5 14120000 For specially ordered work clamp foot Work clamp foot blank 24 22 14 14 36 7 7 With knurl processed right 40021869 With knurl processed left 40021870 High voltage applicable High voltage transformer asm 40005427 Option pedal 1 pedals PK57 PK57 conversion cable asm 2 pedasl Tandem pedal Pedal switch conversion Cable asm GPK570010B0 M90135900A0 M85205800A0 M9...

Page 117: ...r the cover when closing it 3 Connect foot pedal switch junction cable to the foot pedal switch cable B and connect the oppo site side of the junction cable to CN41 connector 4 Loosen cable clip band Fix the foot pedal switch cables excluding earthing wire by means of cable clip band together with other related cables DANGER To prevent personal injuries caused by electric shock hazards or abrupt s...

Page 118: ... 1 operation OFF when depressing pedal again OFF when detaching from pedal When the pedal is depressed to the middle step the presser foot comes down When it is released the presser foot goes up When the pedal is fully depressed the sewing machine starts sewing 6 Wiring diagram 1 2 3 4 1 2 3 4 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 5V PRSR GND 5V START GND 5V PRSL GND CN41 M90135900A0 GPK570010B0 NO ...

Page 119: ...ndard pedal Option pedal U024 Optional pedal 1 operation OFF when depressing pedal again OFF when detaching pedal The right side switch controls the presser foot and the left side switch controls the start of the sewing machine 2 Wiring diagram 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 5V PRSR GND 5V START GND 5V PRSL GND CN41 M85205800A0 Left switch Right switc...

Page 120: ...oot goes up by re depressing the pedal 2nd step of the pedal When the presser foot is depressed when the presser foot is in its intermediate position the presser foot comes down to its lower end When the presser foot is depressed again the presser foot goes up until its intermediate position is reached and stops there Start When the pedal is depressed while the presser foot is in its lower end the...

Page 121: ...way Magnet wiper The operation can be set with the following items K052 Magnet wiper out time Setting possible in the unit of 10 ms K053 Magnet wiper in time Setting possible in the unit of 10 ms 4 Connection of the pause switch 1 Set the memory switches as follows Select the framed items U031 Sewing machine operation can be stopped with panel key clear key Inffective Panel RESET key External swit...

Page 122: ...he foot switch presser start switch and therefore it cannot be used simultaneously with the optional pedal marking light 1 Wiring diagram 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 5V PRSR GND 5V START GND 5V PRSL GND CN41 MAIN PWB 2 Applicable connector No 1 2 Part No HK016510090 HK016540000 Part name Housing Pin contact 3 Marking light Recommended Neoark Corporation LEM 1GP green crisscross LEM 1RP ora...

Page 123: ...diagram 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 5V OPSW STSW 24V CYCLE ERR GND GND CN41 Red Diode for protection against reverse connection Black Coil Diode CN36 MAIN PWB 2 Applicable connector No 1 2 Part No HK01651008B HK016540000 Part name Housing Pin contact 3 Solenoid valve for cooler 24 V DC 1 8 W Surge voltage protection circuit with polarity is equipped as shown in the diagram below Ex SMC Corpora...

Page 124: ...Without knurl With knurl With knurl 29 25 17 5 14 5 29 25 17 5 14 5 20 4 6 21 2 5 4 11 4 4 8 Sewing spec ification S B F B F H W M Finger guard 13533104 Remarks Standard ac cessory for S standard type machine head Supplied with F foundation type machine head Depends on the destination Optional Standard ac cessory for M knit goods type machine head Install a finger guard suitable for each work clam...

Page 125: ...oot 14137509 right 14137608 left 40021871 right 40021872 left 40021874 right 40021875 left 40021877 right 40021878 left 40021880 right 40021881 left 4 33 23 5 60 13 6 9 28 41 14 23 12 29 45 ø 1 2 10 30 45 ø 1 0 14 28 45 ø 1 4 Feed plate 14137707 40021873 40021876 40021879 40021882 Without knurl With knurl With knurl With knurl With knurl 30 16 6 50 14 4 9 4 ø 1 2 4 ø 1 0 4 ø 1 4 4 Sewing spec ific...

Page 126: ...nd open the control box cover after about five minutes have passed Insert the jumper connector M85236000A0 to CN14 2P of SDC board It can be used in AC100 to 120V power supply volt age In the case of 3 phase specification supply power to black and white lines of power cord Red line is not connected Caution When supplying the AC200V power while inserting the jumper connector board breakage will be ...

Page 127: ...rease This type of grease is used in general sliding parts Maker name Brand name Esso Barch L1002 Shell Albania EP 2 JX Holdings Inc Epinok AP2 Lisonix 2 Idemitsu Kosan Co Ltd Coronex 2 Unirex N3 Grease D Used for the feeding gear block 10g tube JUKI Part No 13525506 JUKI Grease A Used for high speed sliding parts and their peripheral parts Used in particular for the specific areas with highly loa...

Page 128: ... 114 4 Parts to which grease is applied 1 Work clamp foot lifter area 2 Wiper area Grease JUKI Grease A Grease ...

Page 129: ... 115 3 Thread tension area 4 Thread trimmer area Grease Grease JUKI Grease A ...

Page 130: ... 116 5 Feed area Grease Grease D ...

Page 131: ... 117 6 Needle bar and main shaft area 7 Lower shaft area JUKI Grease A JUKI Grease A ...

Page 132: ... 118 8 Needle thread clamp mechanism area For LK 1900BB 1903BB Grease ...

Page 133: ... 119 9 LK 1901B relations Grease ...

Page 134: ... 120 10 LK 1903B relations Grease ...

Page 135: ... 121 11 LK 1900BB 1903BB relations JUKI Grease A ...

Page 136: ...he memory switch and set up the Memory switch U245 at 0 with the reset key Caution 1 If the memory switch No 245 is not reset at 0 after the replenishment of grease Error No E220 or No E221 will be displayed again 2 For the replenishment of grease to the parts specified below use the attached JUKI Grease A Part No 40006323 If any grease other than the specified item is replenished this can be a ca...

Page 137: ... after resetting E014 Write protect USB thumb drive is write protected Re operation is enabled after resetting E015 Format error USB thumb drive cannot be format ted Re operation is enabled after resetting E016 External media capacity over Memory capacity of the USB thumb drive to write pattern data is not suf ficient Re operation is enabled after resetting E017 Machine memory capacity over Memory...

Page 138: ... of machine head and the type of control box do not match Turn the power OFF and contact JUKI or your dis tributor E204 Connection alert for the USB thumb drive which is used for sewing Sewing has been carried out by 10 or more times with the USB thumb drive inserted in the USB port Re operation is enabled after resetting E220 Grease replenishing time infor mation Information as to the time of rep...

Page 139: ...der error The suction nozzle cylinder fails to operate The suction nozzle cylinder sensor fails to turn OFF when the cylinder operates Turn OFF the power switch Check whether the air pressure is adequate and whether the suction nozzle cylinder sensor and MAIN PCB CN54 have loosened or fallen off This error occurs when it does not become to the state that the suction nozzle cylinder turns ON and th...

Page 140: ...ect ed Turn OFF the power switch and turn ON the power switch again after some time E903 Stepping motor power supply trouble Power supply of the stepping motor is not output Turn OFF the power switch and check F1 fuse of SDC board Check the cause of blown out of the fuse E904 Solenoid power supply trouble Power supply of the solenoid is not output Turn OFF the power switch and check F2 fuse of SDC...

Page 141: ...on Turn OFF the power E927 Y motor displacement error Y feed motor is out of position Turn OFF the power E929 Needle thread clamp motor dis placement error Needle thread clamp motor is out of position Turn OFF the power switch and check whether CN45 of MAIN circuit board is loose E931 X motor overload error The load applied to the X feed motor is excessive Turn OFF the power E932 Y motor overload ...

Page 142: ...en the oscillator and the shuttle driver shaft is large Check oscillator gear positioning and adjust the lower shaft gear backlash 2 2 Too much clearance between inner hook and shuttle driver Adjust the clearance between inner hook and shuttle driver 3 Deformation in sewn patterns 3 1 Too much backlash in the Y feed gear 1 A Backlash is too much in the Y feed arm and the motor base Adjust backlash...

Page 143: ...y 3 6 Inadequate adjustment of the Y slit plate Adjust position of the Y slit plate cor rectly 4 Sewing machine locked 4 1 Large needle compared with the hole diameter of the needle hole guide Replace the needle hole guide 5 Severe vibration 5 1 Inadequate crank balancer positioning Define the correct crank balancer position 6 Malfunction of vertical move ment of work clamp foot 6 1 Looseness of w...

Page 144: ...tween the needle hole guide and the counter knife is excessively high Adjust the height of the counter knife 2 F Needle thread tension is high and the thread is excessively stretched Adjust the needle thread tension 2 G Thread spreading section of the moving knife has scratches Polish the thread spreading section of the mov ing knife with buff or replace the knife 1 3 Length of bobbin thread remai...

Page 145: ...900BB BNB 1903BB BNB Clean up the needle thread clamp section 1 6 Threading the needle bar thread guide is wrong Refer to the item Threading the needle bar thread Guide 1 7 Bobbin runs idle and the bobbin thread is drawn out Use a stronger idling prevention spring 7 A Initial positioning of the moving knife is inadequate Adjust the initial position of the moving knife 2 Needle breakage 2 1 Inadequ...

Page 146: ...initial position of sensor 2 9 Needle comes in contact with the suction nozzle LK 1900BB BNB 1903BB BNB 9 A Sensor position is inappropriate Check the initial position of suction nozzle and adjust the initial position of sensor 3 Stitch Skipping 3 1 Too much clearance between the nee dle and the inner hook Adjust the clearance between needle and inner hook 3 2 Inadequate timing adjustment for the ...

Page 147: ...ner hook polish it with polishing powder 4 2 Thread enters into the shuttle 2 A Position of the shuttle upper spring is wrong Properly adjust the position of the shuttle upper spring 2 B Blade point section A of the shut tle is round Replace the inner hook 2 C Position of the shuttle is wrong Properly adjust the position of the shuttle 2 D Needle thread tension is too low Properly adjust the needl...

Page 148: ...tive 1 A Floating amount of the thread tension disk No 2 is small Adjust the amount of thread tension No 2 float ing 5 2 Thread spreading section of the mov ing knife has scratches Paying attention to the blade section polish with polishing powder 5 3 Shuttle upper spring has scratches Remove the scratches 5 4 Level difference between the needle hole guide and the counter knife is too high 4 A Thr...

Page 149: ...e blade section polish with polishing power or replace the moving knife 2 B Shuttle upper spring has scratches The shape of the thread trimmed becomes and thread waste remains Remove the scratches 6 3 Moving knife does not spread threads 3 A Initial position of the moving knife is maladjusted Adjust the initial position of the moving knife 3 B Thread trimmer cam position is inadequate Adjust the t...

Page 150: ... hole guide to the nee dle to be used and thread is small Replace the needle hole guide with a new one having a larger needle hole 7 7 Shape of the feed plate is defective 7 A Material to be sewn is stiff and closely contacted with the throat plate and there is no clearance be tween them to pass the thread Raise the material to be sewn by means of the feed plate 7 B Material to be sewn is highly e...

Page 151: ...own Attach the needle with the long groove orienting slightly to the right approximately 20 Use a needle cooler 8 5 Uneven stitch tightness due to the stretch of thread 5 A Sewing speed is too fast Reduce the speed by means of the speed vari able resistor 5 B Tension of the thread tension No 2 asm is exces sive Decrease the tension of tension controller No 2 9 Thread chips generated in the shuttle...

Page 152: ... Sharpness of the knife is defective 1 A Worn out of the moving and counter knives Replace the moving and counter knives 1 B Engagement of the moving and counter knives is defective Properly adjust the height and position of the moving and counter knives 13 Thread waste remains around the hook LK 1900BB BNB 1903BB BNB 13 1 Position of the suction nozzle is inap propriate Adjust the position of the...

Page 153: ...ace the FLT board 1 D The MAIN board has no power supply Check whether 24V is available between pins 1 4 of CN38 in the MAIN board and 1 4 of CN13 in the SDC board If no voltage is found replace the SDC board 1 E The operation panel has no power supply Confirm that the cable from the operation panel is connected to CN34 of the MAIN board If there is no problem in connections replace the MAIN board...

Page 154: ...eplace the INT board or MAIN board or needle thread clamp motor 1 B Abnormality of the encoder signal Check the connection of CN77 of the INT board If there is no problem in connections replace the INT board or MAIN board or needle thread clamp motor 1 C Motor power is not supplied Check the connection of CN31 of the MAIN board If there is no problem in connections replace the MAIN board or SDC bo...

Page 155: ...there is a problem with the resistance value replace the Y feed motor Check the feeding mechanism in Y direction whether there is an overload If there is a problem with the mechanism remove the cause of overload 1 B Failure of the encoder signal Check the connection of CN76 of the machine head INT board If there is no problem in connections replace the Y feed motor or machine head INT board 9 When...

Page 156: ...resistance value replace the motor 11 Error E302 appears 11 1 The contact of machine head tilt detection switch is opened 1 A Connection defective Check the connection of CN73 of the machine head INT board 1 B The switch does not function Check whether the switch is turned on in the state that the machine head is in a normal state If the switch is not turned ON readjust it 1 C The switch is out of...

Page 157: ...motor is not stable The coupling that connects the main motor and main shaft is too far Re adjust it to the proper clearance Encoder signal of the main shaft motor is not stable Replace the main motor 15 Error E811 appears 15 1 Power supply voltage is too high AC280V or more 1 A The supplying power is high Check the supplying power Change the connection of power supply 1 B Detecting circuit is out...

Page 158: ...rd and check the output of the SDC board Turn on the power If DC85V is not generated replace the SDC board 1 B 24V system is out of order Disconnect CN38 of the MAIN board and check the output of the SDC board If there is no 24V output between pins 1 4 replace the SDC board Measure the resistance value of pins 1 4 of CN38 of the MAIN board If there is short circuit replace the MAIN board 20 Error ...

Page 159: ... shorter thread remain ing thread trimming cylinder turns ON and the sensor turns OFF before origin retrieval or during shorter thread remain ing thread trimming 1 A An air is not supplied Turn OFF the power switch and check an air pressure 1 B Cylinder sensor mounting posi tion is inadequate Make sure that the cylinder sensor LED lights up in the initial state of power supply ON and LED goes out ...

Page 160: ...hread remaining thread trimming cylinder sensor and there is any loosening or missing of pins on CN53 of MAIN board 1 B Cylinder sensor mounting posi tion is inadequate Make sure that the cylinder sensor LED lights up in the initial state of power supply ON and LED goes out in the operating position 27 When turning ON the READY key error E399 appears 27 1 The suction nozzle cylinder sensor does no...

Page 161: ...CN48 CN49 CN50 赤白白黒白ソフト書き込み PLD JTAG DSP JTAG つまみ装置ソレノイド組 OP IP仕様 40144886 ペダルセンサーＬ組押え上げセンサー結合糸切りセンサー結合押えスタートスイッチ電源スイッチ主軸サーボエンコーダー主軸サーボモーター動力線主軸モーターＸ送りモーターＹ送りモーター糸つかみモーター糸切り押え上げモーター Pedal sensor L asm General export General Main shaft servo encoder Main shaft servo motor power cable Main shaft motor X feed motor Unipolar Unipolar Bipolar Bipolar 2 phase 2 phase 2 phase 2 phase Y ...

Page 162: ...3195 LK 1900BB 1903BB 黒電磁弁コードA組 40153196 CN146 電磁弁コードB組 40153197 LK 1900BB 1903BB 2ポートソレノイドバルブ PV120205000 Pedal sensor L asm Auto switch A asm Auto switch B asm 2 port solenoid valve Solenoid valve cord A asm Solenoid valve cord B asm General export General Main shaft servo encoder Main shaft servo motor power cable Main shaft motor X feed motor Unipolar Bipolar Bipolar Unipolar 2 phase 2 phase ...

Page 163: ...8 CE 4016295 FLT T 40105465 3ø FLT CE 40145901 CE Only for CE and 3ø 40141487 General 40023371 General export M90175800A0 3ø 40005390 CE AC200 240V 40113427 It is not supplied with CE type CN1 CN16 FG1 FM ONE 40114375 40142267 40114373 CN10 6P 6P CN11 CN37 CN36 Red BR IF OP CN31 CN38 40P CN13 85V 4P 40P 4P 2P CN16 9P 8P CN50 White DSP JTAG 10P CN49 White PLD JTAG 6P CN54 Red Suction nozzle sensor ...

Page 164: ... 150 4 Power supply circuit diagram Single phase SDC board MAIN board Light blue Orange Brown Yellow Red Black ...

Page 165: ...38 CN13 24V IP24V 5V PGND 橙黄赤黒 AC200V AC200V DC280V 12V CN16 RL_ON AGND FLT CE基板 AC200V AC200V 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18...

Page 166: ...USW_N ERR_N PDET_N MA MB MBRK_N SSTATE_N SDET_N DDET_N UDET_N CN31 85V PGND 24V IP24V 5V PGND CN38 CN13 24V IP24V 5V PGND 橙黄赤黒 AC200V AC200V DC280V 12V CN16 RL_ON AGND FLT T基板 AC200V AC200V 1 2 3 4 5 6 AC200V AC200V FG NC NC NC 黒白緑白黒赤青 DC280V AGND 赤 CN1 1 2 3 4 5 6 1 2 3 4 1 2 3 6 5 4 1 2 3 6 5 4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 ...

Page 167: ... 153 7 Servo motor circuit diagram SDC board AC servo motor Encoder White Black Orange Blue Purple Light blue Pink Red Yellow White Black Red Green Yellow ...

Page 168: ... φ3 Y φ4 1 2 3 4 白 Y COM1 5 緑 Y COM2 6 1 2 3 4 黒緑青赤 CN45 赤 TC A TC A TC B TC B 1 2 3 4 1 52Ω 1 52Ω 0 65Ω 0 65Ω 1 52Ω 1 52Ω Ｙ送りモーター押え糸切りモーター糸つかみモーター 1 14Ω 1 14Ω 1 2 3 4 MAIN board X feed motor Y feed motor Work clamp foot thread trimming motor Needle thread clamp motor White White Green Green Blue Blue Pink Pink White Blue Black Red Red Red Yellow Yellow Orange Blue Red Yellow Black Green Blu...

Page 169: ...5V 5V 5V 5V GND GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 TXD TXD_N RXD RXD_N RTS RTS_N CTS CTS_N CLK CLK_N S_ERSET PWRF SL_VR SSTATE GND GND UDET NC 24V 24V 5V 5V 5V 5V GND GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 MAIN board ...

Page 170: ...ーエンコーダー CN76 青 X AN X A X B X BN 5V GND CS 2 SCTK MOSI MISO 白灰緑黄茶紫橙青赤黒 1 2 3 4 5 6 7 8 9 10 Ｙ軸モーターエンコーダー CN77 赤 X AN X A X B X BN 5V GND CS 3 SCTK MOSI MISO 白灰緑黄茶紫橙青赤黒 1 2 3 4 5 6 7 8 9 10 糸つかみモーターエンコーダー CN71 黒 5V OPORG GND 赤白黒 1 2 3 3 2 1 押え原点センサー CN72 赤 5V TRM GND 赤白黒 1 2 3 3 2 1 糸切り位置センサー CN73 赤 SAFTYSW GND 黒白 1 2 頭部安全スイッチ MAIN board Machine head INT board X axis motor en...

Page 171: ...V SENSOR1 GND 5V SENSOR2 GND 吸引ノズル駆動用電磁弁残短メス駆動用電磁弁糸くず吸引用電磁弁残短糸切り側センサー吸引ノズル側センサー 1 2 3 4 1 2 1 2 3 1 2 3 4 CN46 黒 CN52 黒 CN53 黄 CN54 赤 VL1 VL3 CN146 白 1 2 1 2 赤黒赤黒白黒茶黒青茶黒青赤黒注電源ONでセンサーLED点灯注電源ONでセンサーLED点灯 MAIN board Solenoid valve for suction nozzle driving Solenoid valve for thread waste suction Solenoid valve for shorter thread remaining knife driving Sensor of shorter thre...

Page 172: ...411 50 50 133 5 418 5 110 283 270 40 Z Z 1 2 Ø36 Ø16 135 120 6 35 263 5 120 390 488 503 85 40 256 1046 85 25 30 5 R 3 0 R 3 0 R 1 0 R 1 0 50 38 Ø 25 10 50 85 7 56 1 148 0 5 630 3 419 116 4 257 1 306 1 139 5 0 5 48 7 1 259 8 1 158 0 5 360 1 28 0 5 120 10 320 1 158 8 1 115 1 810 1 38 0 5 124 1 175 6 1 17 5 4 R10 For oil drain funnel installing 3 7 drilled hole depth 6 8 drilled hole 4 9 drilled hole...

Page 173: ...1 1 1 For LK 1902B 4 2 drilled hole depth 10 on the rear side Stand installing hole Drawer stopper installing position One place on the rear side 6 3 drilled hole depth 10 on the rear side Drawer installing hole 4 8 drilled hole 30 drilled hole 51 spot face depth 16 For oil drain funnel installing 3 7 drilled hole depth 6 8 drilled hole 4 9 drilled hole 26 spot face depth 7 3 3 drilled hole depth ...

Page 174: ...YO 206 8551 JAPAN http www juki com An environmental management system to promote and conduct the following 1 Eco friendly development of products and technologies 2 Green procurement and green purchasing 3 Energy conservation reduction in carbon dioxide emissions 4 Resource saving reduction of papers purchased etc 5 Reduction and recycling of waste in the activities of research development design...

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Summary of Contents for LK-1900B series

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JUKI LK-1900B series, Engineer'S Manual

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Summary of Contents for LK-1900B series

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