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The description covered in this engineer's manual is subject to change for improvement of the

commodity without notice.

01 · 01 Printed in Japan (E)

INTERNATIONAL SALES H.Q.

8-2-1, KOKURYO-CHO,
CHOFU-SHI, TOKYO 182-8655, JAPAN
PHONE : (81)3-3430-4001 to 4005
FAX : (81)3-3430-4909 • 4914 • 4984
TELEX : J22967

2000-2001 JUKI CORPORATION.

Summary of Contents for SC-905

Page 1: ...ENGINEER S MANUAL 29345808 No 01 Direct drive Computer controlled High speed 1 needle Lockstitch Zigzag Stitching Machine LZ 2290 Series CP 760 SC 905...

Page 2: ...ium weight materials 10 mm 2 8 kinds 14 patterns Custom pattern 64 stitches 8 kinds can be stored SCHMETZ 134UK 438 ORGAN DPX5 65 to 90 178 mmX517 mm 4 000 rpm Excluding a certain territory of export...

Page 3: ...t Custom pattern Number of stitches for pattern Max zigzag width Pattern selection key Remarks Scroll can be performed by pressing again Standard scallop Crescent scallop Equal width scallop Equal wid...

Page 4: ...he stand or the like 3 Be sure to securely set the connector of the safety switch to the control box to prevent accidents at the time of maintenance 4 Oil is kept in the gear box for lubrication It is...

Page 5: ...iper evice 9 Power switch 6 Thread stand 3 Thread take up cover 0 Hand switch 7 Setting display section 4 Finger guard 1 Stitch length dial 8 Reverse feed stitching lever 5 Thread tension controller 2...

Page 6: ...enoid etc pedal sensor to detect pedal action and power circuit to activate respective functions 7 Pedal This pedal performs sewing machine speed control thread trimming action presser lifting action...

Page 7: ...he throat plate Reference for the height and inclination of the feed dog When the respective marker dots are leveled the height is 1 2 mm and the inclination is leveled Timing mark F engraved on face...

Page 8: ...g should be leveled A Adjusting procedure by removing the gear box cover 1 Remove the gear box cover Refer to the item 4 1 2 Adjust the marker line engraved on the thread take up to the timing mark G...

Page 9: ...tandard Adjustment LZ 2290SS DS Condition Feed amount maximum Feed bar A B Feed crank stud Timing mark Normal feed amount regulation metal fitting Feed spring hook Feed converting arm A asm Feed adjus...

Page 10: ...tion Refer to Adjusting the condensation stitching mechanism in the Instruction Manual for the LZ 2290 Series The engraved dot is for reference only and fine adjustment is necessary When the ratio of...

Page 11: ...te of engraved marker dot of vertical feed link shaft Standard height of feed dog Operator s side Sewing direction Upper material Lower material Minus slippage of material Upper material Lower materia...

Page 12: ...nce and mainly adjust 3 In the case where the slippage of material 0 to minus cannot be obtained by adjusting vertical feed link shaft 3 only adjust vertical feed link shaft 2 so that theta inclinatio...

Page 13: ...s required to be replaced Assemble link 9 and motor shaft so as to be flush with each other Condition of the origin 0 When the link is at 90 move the light up sensor from the rightend to the left The...

Page 14: ...acing or adjusting the needle rocking motor For the replacement of the sensor refer to the item of the sensor 4 Loosen setscrew 5 in the motor link bracket and remove link 9 5 Loosen four setscrews 6...

Page 15: ...entry position In terms of longitudinal direction Standard Adjustment Needle bar support base shaft connecting stud As observed from the face plate side Engraved marker dot For an excessive play Adju...

Page 16: ...the needle bar has to be moved by a large margin for the adjustment of the needle entry position in case of replacement of gauges carry out the adjustment referring to 10 Position of the needle bar co...

Page 17: ...djustment Conditions Zigzag width 0 Position of needle position changing lever Center Part No of engraved indication E 22536502 Dimension a 12 2 mm Dimension b 3 4 mm Woodruff plate Engraved indicatio...

Page 18: ...rank rod guide the same as the steps 4 5 and 6 Set the needle throw torque at the needle bar support base to 500g or less 8 Tighten the screw in the needle bar support base shaft referring to 7 Adjust...

Page 19: ...hen the needle reaches the rightmost end of the zigzag stroke Remarks Marker lines engraved on the face plate The needle to hook timing is adjusted using the timing gauge as described above However yo...

Page 20: ...d and does not come in contact with the blade point of the hook at both the rightmost and leftmost needle throwing positions At this time adjust so that a clearance of 0 to 0 05 mm is provided between...

Page 21: ...bottom end of needle bar faces to this side or the right end faces to the rear end 2 In case where the flat portion is at the bottom end of needle bar Install the holder so that the thread hole faces...

Page 22: ...by fingers in the reverse direction of rotation to confirm that the bobbin case will never slip out of the small claw Loosen needle clamp screw 2 or needle bar thread holder screw 1 and adjust the pos...

Page 23: ...ays moves the center of the needle bar and needle bar thread holder while keeping in parallel to the needle rocking stroke 0 to 1 mm Needle bar thread holder Auxiliary thread take up lever Auxiliary t...

Page 24: ...ect vertical position the thread take up amount of the auxiliary thread take up lever will be decreased and larger thread loops will be produced On the contrary if the auxiliary thread take up lever i...

Page 25: ...of the pre tension Standard Adjustment Striking face on the machine arm Thread tension controller Setscrew nut 1 Almost in parallel to the machine arm Thread should rnter the rotary disk straight Fig...

Page 26: ...that the thread enters the rotary disk straight 3 Adjust the pressure of the pre tension so that the rotary disk rotates smoothly If the orientation of the pre tension is improper the thread is bent...

Page 27: ...lling the thread take up thread guide B Standard Adjustment 20 Installing the thread take up Standard Adjustment D F C G A B E Tension disk Stopper rubber Thread take up spring guard Direction of rota...

Page 28: ...ced upward the thread will come in contact with the edge of the machine arm This will adversely affect the quality of the finished seam If the thread take up is not fixed taking the correct method tim...

Page 29: ...m should be provided between the end of needle rocking motor installing boss and the bobbin winder driving wheel asm At this time tilt the bobbin winder lever in the direction A and adjust so that the...

Page 30: ...ber ring 3 shift with each other adjust again 4 Securely tighten screws 1 Caution The rubber ring is the article for consumption If the rubber ring is excessively worn out replace it with a new one Pa...

Page 31: ...djustment Race surface Approx 1 5 mm Appropriate amount of oil large Race surface Approx 0 5 mm Appropriate amount of oil small Oil splash on a sheet of paper while the machine is operating for 5 seco...

Page 32: ...ove moving knife pin 6 in the direction of the arrow is more or less than 600 gf If screw 5 is excessively loose defective thread trimming may occur When the moving knife is properly positioned When t...

Page 33: ...l roller 4 fits in the groove in thread trimming cam 8 Now lightly turn the main shaft handwheel carefully in the reverse direction until it stops At this time the marker dot engraved on the machine a...

Page 34: ...ng knife will fail to cut the thread or cut the thread at a wrong position reducing the length of remaining thread after thread trimming If the timing of the thread trimming cam is excessively advance...

Page 35: ...p position of the needle position at which the marker dot engraved on the machine arm is aligned with the white marker dot engraved on the handwheel is when the marker line engraved on the thread take...

Page 36: ...xcessively narrow the position detecting magnet comes in contact with the synchronizer and if it is excessively wide defective detection may occur 2 Be sure to adjust screw No 1 in the handwheel to th...

Page 37: ...presser plate of the thread tension releaser should be engaged with the roll pin and the auxiliary pin of the thread tension releaser When the solenoid is pushed by fingers in the direction A it shoul...

Page 38: ...the time of thread trimming resulting in slip off of the thread If the thread tension releasing solenoid fails to be engaged with the roll pin the return spring lacks or the solenoid fails to smoothly...

Page 39: ...crew 5 in the feed controller Caution Note that the end face of the feed controller shaft should be flush with that of the feed controller At this time the feed controller and the components of the fe...

Page 40: ...ted turn stitch length dial 8 condensation dial 9 and check that the dial moves as specified in the scale When the marker dot engraved on the machine arm cannot be adjusted check and re adjust from th...

Page 41: ...ion of the thread draw out wire Standard Adjustment Forced lubrication is performed to the hook by means of the plunger pump placed in the hook shaft front bushing in the machine head Upper marker lin...

Page 42: ...r marker line fill JUKI Defrix Oil No 1 from oil inlet 4 up to the marker line of oil tank 2 with the sewing machine tilted Even when the gauge comes down to the lower marker line oil in the oil tank...

Page 43: ...bserved from from the operator the wiper should be leveled Wiper Leveled Wiper base Auxiliary thread take up lever installing base Thread draw out wire Thread draw out wire installing base 2 Setscrew...

Page 44: ...ing the remaining amount of needle thread shorter take care so that the thread draw out wire and the thread guide do not come in contact with each other 3 When turning OFF the thread draw out unit it...

Page 45: ...operation it should not come in contact with the auxiliary thread take up lever When needle stops in its upper stop position a clearance of approximately 2 mm should be provided between the needle ti...

Page 46: ...er Adjustment Loosen setscrews 1 and 2 when the solenoid is not actuated OFF Adjust the state A by moving the entire unit of solenoid up or down Loosen setscrews 1 one each for both sides and adjust t...

Page 47: ...riodically fill up the exclusive grease approximately once or twice a year Note when applying grease 1 Needle bar metal of DS and DU heads Needle bar metals are set to the upper and lower parts of the...

Page 48: ...the machine is used under the severe conditions remove link shaft No 37 and fill up the exclusive grease to the grease groove 3 Feed base shaft of DS and DU heads There are two grease holes in the sh...

Page 49: ...m rod 2 Loosen setscrews 2 in the feed adjuster cover a n d a d j u s t s o t h a t horizontal feed rod 4 can smoothly move up or down Then tighten setscrews 2 3 Turn the handwheel and tighten setscre...

Page 50: ...and carefully perform the work The horizontal feed cam and hook driving gear are mounted in the gear box large In the case where centering and adjustment of play of the aforementioned components are...

Page 51: ...setscrews 6 in the coupling and remove the coupling from the motor 7 Fit the coupling the hole diameter of which is smaller to the new motor adjust screw No 1 of setscrews 6 to the flat portion of the...

Page 52: ...ike enters from the part and the sensor section is damaged As a result malfunction of the motor may be caused Take care of the dust when replacing the motor and install the handwheel quickly When stor...

Page 53: ...disassembling assembling Do not open the gear box cover unless a trouble occurs When it is compelled to open it take care of the following matters Start the work after preparing a new gear box cover p...

Page 54: ...upling setscrews 6 and remove the motor with the coupling installed When the motor is separated from the coupling set the clearance between the end face of the motor and that of the coupling to 0 5 mm...

Page 55: ...g when performing the adjustment of feed dog height or feed timing or the commercially available feed dog is used 3 Exclusive grease Exclusive grease 23640204 is applied to the parts for which lubrica...

Page 56: ...etermining the position fix the pump metal fixing screw Tightening torque 25 Nm When the position of the pump metal is properly adjusted correct the position of the hook shaft Adjust the groove of plu...

Page 57: ...the front of the machine bed insert a piece of stiff thread or the like into the gear box and check whether oil is fully contained inside When oil is insufficient open the gear box cover or draw out a...

Page 58: ...yarn and the thread is retained by the fabric yarn Particularly when power net is sewn with span thread The needle has a blunt tip Reduce the stroke of the thread take up spring Re adjust the hook ti...

Page 59: ...hroat plate The presser foot rises Recess on the sole of the presser foot is smaller for the stitch length employed The stroke of the thread take up spring is too small Tension of the thread take up s...

Page 60: ...on of the pre tension disk is defective As a result the disk rises in accordance with the tension it applies Increase the needle thread tension and bobbin thread tension Adjust so that a bobbin is eve...

Page 61: ...iming to the proper one Enter thread in hole A of the bobinn case Increase the presser foot pressure Re attach the presser foot so that it closely fitted onto the throat plate or replace the presser f...

Page 62: ...obbin thread from smoothly interlacing with each other 6 A Needle thread is not early retained with the presser foot and the throat plate 7 A The needle thread and bobbin thread do not interlace with...

Page 63: ...excessively retarded 1 A Thread trimming cam timing has been excessively advanced 1 B Locus of the moving knife is defective 2 A The thread slacks because of small stitch length 2 B The needle repeate...

Page 64: ...mming 2 A Thread tension is insufficient at the time of thread trimming 1 A Bobbin thread tension is too low Reduce the needle thread tension The needle thread tension may have been increased because...

Page 65: ...the presser fulcrum is in the front side Height of the feed dog is too high Lower the rear end of the feed dog Raise the front end of the feed dog Raise the rear end of the feed dog Lower the front e...

Page 66: ...nts of change and updating setting No in UP direction SET 3 Down switch DOWN 4 Up switch UP WARNING To avoid possible personal injuries caused by movement other than that you desired do not operate th...

Page 67: ...N SETTING No 5 Press switch 2 four times to set the setting No to 5 Press switch 4 five times to change the set No to 5 since the current set value is displayed on LED 6 Standard 0 Reference Keep pres...

Page 68: ...if the value is changed since the machine will break Flicker reducing function If the hand lamp flickers 0 Flicker reducing function is not operative 1 Less effective 8 Highly effective Bobbin thread...

Page 69: ...break Do not change the set value It is very dangerous if the value is changed since the machine will break Function of lifting presser foot when the pedal is in neutral position 0 Function of neutra...

Page 70: ...esser foot after the pedal has been depressed Start of rotation of the sewing machine is delayed during this time Compensation of starting the solenoid for reverse feed stitching when reverse feed sti...

Page 71: ...s very dangerous if the value is changed since the machine will break Do not change the set value It is very dangerous if the value is changed since the machine will break Do not change the set value...

Page 72: ...he power or thread trimming 0 Normal needle up down compensating stitching only 1 One stitch compensating stitching is performed only when aforementioned changeover is made Upper stop upper stop Do no...

Page 73: ...l sensor spring or the like is replaced 1 Pressing switch 1 turn ON the power switch 2 Indication on the screen will be as illustrated in 2 At this time the value indicated in the 7 segments of four f...

Page 74: ...ignal is imputted L is output when the needle bar is in its lower position L is output when the needle bar is in its upper position L is output when the sewing machine is in stopping state 0V Pulse is...

Page 75: ...g mode input switch 2 Bobbin thread counter reset switch 3 Bobbin thread amount setting switch 4 Bobbin thread counter 5 Needle up down compensating switch 6 Thread trimming prohibiting switch LZ 2290...

Page 76: ...Functions that cannot be locked at the L_1 level 1 Zigzag pattern 2 ON OFF of the automatic reverse feed stitching 3 Prohibition of thread trimming 4 Specifying the stop position 5 Bobbin thread coun...

Page 77: ...plug and receptacle for loose connection and disconnection Check the power switch terminal for loose connection and disconnection Check whether power fuse has blown Check whether input voltage is lowe...

Page 78: ...rn copy between panels is larger than max zigzag width limitation Stitch base line position error 1 When the value of max zigzag width limitation is changed the zigzag width is within the value of max...

Page 79: ...at the position specifying data of the custom pattern In case the travelling amount of the start from the end of custom pattern exceeds 8 0 mm Condensation custom pattern pitch error The max traveling...

Page 80: ...n Refer to 16 Error code list for error No and the description 17 OPTIONAL COED 1 Relay cord A asm for standing machine Part No M9701351AA0 1 Wiring diagram of variable pedal PK 70 71 Power source sec...

Page 81: ...anel 2 Relay cord A asm for DC24V Part No M9703351AA0 Use this cord by inserting it into the yellow connector CN15 2P of DC24v in PSC box 1 2 3 4 5 6 7 8 9 10 11 12 CN 55 5 V SPEED VARIABLE RESISTOR S...

Page 82: ...AL MAIN SHAFT MOTOR THREAD TRIMMING SOLENOID REVERSE STITCH SOLENOID SAFETY SWITCH THREAD DRAW OUT SOLENOID NEEDLE THROW MOTOR ORIGIN SENSOR WIPER SOLENOID TENSION RELEASE SOLENOID REVERSE STITCH SWIT...

Page 83: ...82...

Page 84: ...38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 5 0 4 0 3 0 2 0 1 0 0 0 1 0 2 0 3 0 4 0 5 0 Step No 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...

Page 85: ...84...

Page 86: ...2 0 R2 2 5 R10 R 1 0 80 29 88 5 0 5 279 1 172 5 80 520 29 80 R 1 0 R 1 0 151 0 5 75 5 0 5 R18 R22 5 223 181 0 1 R22 5 R18 R30 R 3 0 R22 5 R20 22 5 22 5 136 491 390 138 0 5 131 24 15 40 R30 W W U U S S...

Page 87: ...Standard Adjustment which contains important information on the maintenance of LZ 2290 Series CP 760 SC 905 The Standard Adjustment consists of two parts the former part presents illustration and sim...

Page 88: ...opper 20 14 Orientation of the needle bar thread holder 20 15 Auxiliary thread take up lever 22 16 Position of the thread tension 24 17 Position of the pre tension 24 18 Position of the thread take up...

Page 89: ...TO MECHANICAL COMPONENTS 61 10 FOR GENERAL EXPORT 65 11 SETTING FOR FUNCTIONS 65 1 Names and functions of the respective sections of the electrical box SC 905 65 2 How to change over to the function...

Page 90: ...his engineer s manual is subject to change for improvement of the commodity without notice 01 01 Printed in Japan E R INTERNATIONAL SALES H Q 8 2 1 KOKURYO CHO CHOFU SHI TOKYO 182 8655 JAPAN PHONE 81...

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