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MECHANICAL ADJUSTMENT

TOP TENSION

The top tension should be between 65 and 80g when pulling the thread up in the
direction of C.
* Use polyester sewing thread #50 (White).
* If it is not within the above limit, adjust as follows.

1. Set the tension dial “4”.
2. Remove the cover.
3. Lower the presser foot.

• If the top tension is too loose, turn the lead screw in the direction (A).
• If the top tension is too tight, turn the lead screw in the direction (B).

4. Check the top tension and attach the cover.

White polyester thread size 50

Pull the thread at the speed of 110 mm/sec
in the direction of arrow

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Содержание NH60

Страница 1: ...1 SERVICE MANUAL PARTS LIST MODEL NH60 ...

Страница 2: ... BAR HEIGHT 15 NEEDLE DROP POSITION 16 ADJUSTMENT OF HOOK TIMING 17 REPLACING HOOK 18 ADJUSTMENT OF NEEDLE BAR HEIGHT 19 CLEARANCE BETWEEN NEEDLE AND TIP OF HOOK ROTARY 20 FEED DOG HEIGHT 21 TOP TENSION 22 REPLACING THE ELECTRONIC COMPONENTS CIRCUIT BOARD A CONNECTION 23 SELF DIAGNOSTIC TEST 24 28 CIRCUIT BOARD A 29 30 DRIVING MOTOR 31 SWITCHING REGULATOR UNIT 32 ADJUSTING BUTTONHOLE LEVER POSITIO...

Страница 3: ...SSER FOOT LIFTER THREAD TENSION DIAL SPOOL PIN BOBBIN WINDER SPINDLE BOBBIN WINDER STOPPER VALUE SET BUTTONS CURSOR BUTTONS SPEED CONTROL SLIDER NEEDLE POSITION UP DOWN BUTTON AUTO LOCK BUTTON LCD DISPLAY REVERSE STITCH BUTTON START STOP BUTTON EXTENSION TABLE NEEDLE PLATE NEEDLE THREADER THREAD CUTTER FACE COVER DROP FEED LEVER FOOT CONTROL JACK ...

Страница 4: ... wound it will stop automatically Stop the machine and return the bobbin winder spindle to its original position by moving it to the left and cut the thread with a pair of scissors Remove the bobbin from the bobbin winder spindle 10 1 8 3 8 5 8 2 Guide the thread into notch on the front side of the bobbin holder Draw the thread to the left sliding it between the tension spring blades 3 Continue to...

Страница 5: ... end of the thread around the upper thread guide 2 While holding the thread near the spool draw the end of the thread down around the check spring holder 3 Firmly draw the thread up from right to left over the take up lever and down into the take up lever eye 4 Draw the thread through the thread guide Slide the thread behind the needle bar thread guide on the left 5 Thread the needle from front to...

Страница 6: ...rsors appear under both digits when turning the power on x Press the value set keys to change the stitch pattern number until the pattern number of the desired stitch is indicated The number will increase or decrease by 1 each time you press the value set key c Press the key to move the cursor under the tens digit of the stitch pattern number The number will increase or decrease by 10 each time yo...

Страница 7: ...ottom side of fabric is jammed up 4 Feed dog teeth are worn Insert the needle properly Change the needle Rethread Use the recommended sewing needle and thread Use a HA x 11 blue tip needle See mechanical adjustment Needle bar height See mechanical adjustment Adjustment of hook timing See mechanical adjustment Clearance between needle and tip of the rotary hook See mechanical adjustment Replacing h...

Страница 8: ... bobbin holder 4 Thread quality is too low 5 Thread is jamming around the bobbin holder 1 Needle is hitting the needle plate 2 Needle is bent or worn 3 Needle is hitting the hook 4 Fabric is being pulled too strongly while sewing Start with medium speed Use the proper thread path Replace with a new needle Adjust top tension correctly Use appropriate needle for fabric and thread in use Change the n...

Страница 9: ... feed balancing screw See mechanical adjustment Top tension Condition Cause How to fix Reference 6 NOISY OPERATION 7 DEFORMATION PATTERN 1 Backlash between hook gear and lower shaft gear is too great 2 Lower shaft gear is loose 3 Inappropriate belt tension 4 Not enough oil 5 Upper shaft gear is loose 6 Hook is damaged or too worn 1 Inappropriate feed balance 2 Top tension is too strong P 31 P 18 P...

Страница 10: ...HANGING EXTERNAL PARTS FACE COVER To remove 1 Loosen the setscrew 1 and lift the face cover to disengage the rib on the inside Remove the face cover 2 To attach 2 Follow the above procedures in reverse 1 2 ...

Страница 11: ...11 CHANGING EXTERNAL PARTS Free arm cover To remove 1 Loosen the setscrew 1 and 2 Move the free arm cover 3 to the left remove the free arm cover To attach 2 Follow the above procedures in reverse 1 3 2 ...

Страница 12: ... setscrews 1 2 pcs 3 Remove the setscrews 2 5 pcs back cover 3 4 Remove the setscrews 4 2 pcs 5 Loosen the setscrew 5 6 Disconnect all the connectors from the circuit board A NOTE Do not disconnect the connectors by pulling on cord To disconnect grasp the connector not the cord To attach 7 Follow the above procedures in reverse 1 3 2 2 2 4 4 5 ...

Страница 13: ...13 CHANGING EXTERNAL PARTS Front cover 2 1 Disengage the front cover and rear cover hooks 2 Remove the front cover To attach 3 Follow the above procedures in reverse ...

Страница 14: ...ace cover and free arm cover see page 8 and 9 2 Remove the setscrews A 4 pcs 3 Remove the setscrews B 5 pcs and back cover 4 Remove the setscrews C 2 pcs Remove the rear cover To attach 5 Follow the above procedures in reverse Setscrews A Setscrews A Setscrews B Setscrews B Setscrews C ...

Страница 15: ...d dog below the needle plate Place a block 6 mm thick under the presser foot and lower the presser foot lifter 1 3 Loosen the setscrew 2 Raise the presser foot lifter and tighten the setscrew 1 firmly Attach the needle and face plate NOTE Make sure that the presser foot should be parallel to the feed dog slots 3 in the needle plate Presser foot should be parallel to the feed dog slots 6 0 mm 1 2 3...

Страница 16: ...e of the needle hole in the needle plate should be at least 0 2 mm on either side If not adjust as follows 1 Turn the power switch off Remove the face cover see page 10 2 Loosen the hexagonal socket screw 3 x 4 2 Adjust the needle drop position by turning the eccentric pin 3 Attach the face cover 4 The direction of eccentric pin should be as shown in Fig 1 NOTE Check the hook timing after this adj...

Страница 17: ... gauge fits into the slot near the tip of the hook 3 Put the test pin D in the needle clamp Push it up until it stops 4 Tighten the needle clamp screw E 5 Loosen the 2 screws F in the lower shaft gear G 6 Hold the handwheel so that the test pin D will not move and turn the lower shaft gear G until the test pin D comes in be tween the two white lines of gauge C 7 Tighten 2 screws F 8 Attach the bob...

Страница 18: ...and the right edge of feed dog teeth meets 5 Loosen the setscrew A 6 Push the hook shaft B from the hole C with allen screwdriver Remove the shaft washers D E and F Washers D are transparent washer E has a projection on its edge Insert the projection in the groove of the gear when attaching 7 Remove the hook from the hook race do not remove the feed dog teeth when removing it TO ATTACH 8 Reverse t...

Страница 19: ... finger on the gauge fits into the slot near the tip of the hook 3 Attach the needle bar height gauge D Push it up until it stops 4 Tighten the needle clamp screw E 5 Loosen the screw F on the needle bar holder 6 Turn the handwheel toward you until the needle bar reaches its lowest position 7 Move the needle to adjust the position of the needle bar so that the face G touches the side of pin H and ...

Страница 20: ...A 2 pcs 4 Turn the handwheel toward you Adjust the clearance between the needle and the tip of the rotary hook by moving the hook base plate up or down to within 0 1 to 0 05 mm at the left and right needle position 5 Tighten the setscrew A 2 pcs 6 Attach the face cover Remove the master needle Attach the bobbin holder and needle pate 7 Check the clearance between the needle and the edge of the nee...

Страница 21: ...to check the gauge movement The feed dog height should be in accordance with chart 1 adjustment procedure The feed dog is low Loosen the setscrew 1 and nut 2 Turn the adjusting screw 3 in the direction of B to raise the feed dog The feed dog is high Loosen the setscrew 1 and nut 2 Turn the adjusting screw 3 in the direction of C to lower the feed dog 5 Adjust the feed dog height by turning thee ad...

Страница 22: ...the above limit adjust as follows 1 Set the tension dial 4 2 Remove the cover 3 Lower the presser foot If the top tension is too loose turn the lead screw in the direction A If the top tension is too tight turn the lead screw in the direction B 4 Check the top tension and attach the cover White polyester thread size 50 Pull the thread at the speed of 110 mm sec in the direction of arrow ...

Страница 23: ...y pulling on cord To disconnect grasp the connector not the cord 1 Printed circuit board P Black 2 Feed motor White 3 Bobbin winding switch Blue 4 Power switch White 5 Zigzag width motor Green 6 Printed circuit board F White 7 Printed circuit board L White 8 Ground wire or Program Red 9 Buttonhole sensor program Red 10 DC motor White 11 Controller Black 1 2 3 4 5 6 7 8 9 10 11 ...

Страница 24: ...ic procedure and go directly to the test you want to perform Enter self diagnostic mode then select the step number of the diagnostic test you require by pressing the start stop button To begin Turn on the switch if any of the following problems occur take the recommended actions in the order they are shown 1 The machine does not respond when the power switch is turned on Check each connector conn...

Страница 25: ...ss the reverse stitch button to proceed the next step 1 4 3 2 5 6 SELF DIAGNOSTIC TEST 01 Function of LCD buzzer and lamp PROCEDURE step and items to check Correct Condition BH symbol LCD displays SC 03 When the buttonhole lever is pulled buzzer sounds and LCD displays BH symbol When the buttonhole lever is pushed buzzer sounds and LCD displays BH symbol LCD displays SC 04 When the bobbin winder s...

Страница 26: ...stop button to proceed the next step If the result is defective condition press the reverse stitch button to proceed the next step Turn the handwheel toward you Lower the needle bar from its highest to its lowest position Raise the needle bar from its lowest position to its highest position If the result is correct condition press the start stop button to proceed the next step If the result is def...

Страница 27: ...eed the next step If the result is defective condition press the reverse stitch button to proceed the next step Shift the slide volume from left to right then return to the left If the result is correct condition press the start stop button to proceed the next step If the result is defective condition press the reverse stitch button to proceed the next step Press the needle up down button If the r...

Страница 28: ...tion buzzer sounds and LCD displays the defective part number Refer to page 23 25 and fix the defective part The defective part number See page 23 25 Steps and items section To display the version of the program Turn the power switch on while simultaneously pressing needle up down button and the locking stitch button The LCD display will indicate 01 Press the start stop button to display the versi...

Страница 29: ...OMPONENTS Circuit board A 1 To remove 1 Remove the front cover see pages 12 13 2 Pull out connectors from the circuit board A 3 Remove the screws 6 pcs and the circuit board A To attach 4 Follow the above procedures in reverse NOTE Do not disconnect the connectors by pulling on cord To disconnect grasp the connector not the cord ...

Страница 30: ...r switch on while simultaneously pressing left cursor button and the right cursor button 2 After the buzzer sounds press the locking stitch button 1 within 2 5 seconds The LCD should displays S If not press the locking stitch button to select S 2 3 Press the start stop button to determine the setting A long buzzer sounds when the setting correctly finished 4 Turn the power switch off 1 2 ...

Страница 31: ...s 2pcs and the driving motor and the belt To attach 1 Install the driving motor and the motor belt Tighten them with setscrews 2 pcs lightly 2 Move the motor up or down to adjust the motor belt tension The belt should deflect 5 mm when applying 200 grams of load to the middle of the belt Tighten the setscrews 2 pcs firmly 3 Attach the rear cover and the front cover ...

Страница 32: ... Setscrew B REPLACING THE ELECTRONIC COMPONENTS Switching regulator unit To remove 1 Remove the front cover and the rear cover 2 Remove the setscrews A 3 pcs and the switching regulator 3 Remove the setscrews B 4 pcs To attach 4 Follow the above procedures in reverse ...

Страница 33: ...e so the BH symbol disappear when the button hole lever is lowered Tighten the setscrew To adjust the buttonhole sensor position 4 Attach the buttonhole foot R 5 Lower the buttonhole lever to its lowest position and open a 1 6 mm gap between the slider and the buttonhole foot 6 Turn the adjusting screw to the left until the LCD display BH symbol 7 Next turn the adjusting screw to the right until t...

Страница 34: ...34 MODEL NH60 PARTS LIST 1 2 3 4 6 4 5 7 8 9 10 10 11 12 12 13 14 15 16 17 18 18 20 21 22 19 27 26 18 18 25 23 24 24 2 ...

Страница 35: ...56402 808648004 000103509 000072302 808005003 000036005 808511100 808037004 808021005 Upper shaft unit Hexagonal socket screw 4x4 Hexagonal socket screw 4x6 Washer FT80 Shaft fixing metal Felt Shaft fixing metal Lower shaft ring Upper shaft shielding plate Spring pin 3x18 Upper shaft gear Spring pin 3x30 Clutch ring Clutch spring Belt wheel Snap ring E 6 Felt Setscrew 4x8 Handwheel Thread take up ...

Страница 36: ...ARTS LIST 1 2 3 4 5 6 7 8 9 13 14 15 17 18 19 20 21 22 23 24 25 26 27 28 16 29 30 31 32 33 34 35 36 37 38 40 40 41 42 49 48 50 51 39 52 53 54 55 55 56 57 58 9 10 59 9 40 11 12 60 61 61 62 63 66 9 64 65 43 45 44 46 47 ...

Страница 37: ...ver Thread tension release spring Presser foot lifter Snap ring E 5 Presser bar spring adjusting plate Washer 4 Snap ring E 3 Presser bar Presser bar spring Washer Presser bar supporter Hexagonal socket screw 4x8 Needle bar supporter unit Needle bar supporter Threader shaft unit Threader plate unit Threader shaft Spring pin 2x8 Guide pin E 2x16 CH Threader shaft spring Threader lever spring Thread...

Страница 38: ...38 MODEL NH60 PARTS LIST 1 2 3 23 24 26 27 28 28 25 36 29 30 31 32 33 34 35 37 14 14 38 40 41 39 43 44 45 14 46 42 47 48 28 25 49 50 4 5 16 19 10 15 11 7 7 6 10 8 19 17 21 12 14 9 13 18 22 20 ...

Страница 39: ...10406 627569106 102261000 Hook race whole unit Hook race unit Lower shaft unit Lower shaft Upper shaft gear Spring pin 3x18 Washer Shaft fixing metal Lower shaft ring Hexagonal socket screw 4x4 Feed fork Actuator plate Feed fork spring Setscrew 3x4 Feed cam Setscrew TP 3x8 Lower gear Ring Hexagonal socket screw 4x6 Feed lifting cam Feed lifting pin Feed lifting cam spring Snap ring E 4 Lower shaft...

Страница 40: ...40 MODEL NH60 PARTS LIST 13 17 14 15 16 18 23 22 19 21 24 25 27 26 20 28 29 31 32 30 27 35 34 37 28 33 33 1 4 2 3 5 6 7 8 9 10 11 12 36 28 43 43 42 28 39 40 42 41 28 38 ...

Страница 41: ...78100 808079008 808080002 000002105 Needle plate unit Needle plate Support needle plate Setscrew 2x3 5 Spring Snap ring SC 2 4 Hook cover plate release button Supporter plate Setscrew 1 7x2 5 B Nut Setscrew Hook cover plate Idler unit Idler set plate Idler Snap ring E 6 Setscrew TP 4x8 Bobbin winder unit Bobbin winder set plate Bobbin winder arm unit Snap ring E 5 Clutch lever Setscrew 3x8 B Switc...

Страница 42: ...42 MODEL NH60 PARTS LIST 1 5 2 3 4 6 7 8 9 12 10 11 14 13 13 19 13 13 20 15 16 17 18 10 10 13 13 ...

Страница 43: ...32000 000081005 822020503 808622127 808060213 840602006 000104108 808061007 808508001 Rear cover unit Rear cover Top cover thread guide unit Setscrew 2 6x5 Thread guide unit Snap ring CS 8 Spool pin Spool pin support plate Setscrew 3x8 B Bed rubber cushion Carrying handle Carrying handle supporter Setscrew 4x8 Spool holder Face plate unit Face plate Thread cutter unit Setscrew 4x20 Free arm cover ...

Страница 44: ...44 MODEL NH60 PARTS LIST 1 2 3 6 8 9 10 11 13 7 13 13 14 15 16 17 18 19 24 25 26 23 20 22 21 27 27 28 29 30 33 30 34 30 31 32 32 32 5 12 4 ...

Страница 45: ...Panel Double stick sheet Front cover lid Button 1 Button 2 Slide volume Slide volume set plate Setscrew 2 6x6 B Printed circuit board A unit Flame retardant insulating paper Setscrew 3x8 B Start stop button Button 4 Printed circuit board F unit Snap ring CS 3 Printed circuit board L unit Lamp holder Bobbin winder stopper Setscrew 4x16 Washer Nut 4 1 7 Rubber foot Setscrew TP 4x16 Adjustable lock n...

Страница 46: ...46 MODEL NH60 PARTS LIST 1 2 3 6 7 8 9 10 11 15 16 18 12 13 14 19 17 4 5 ...

Страница 47: ...002 802424004 647808009 822019509 829803004 625031500 102403109 753801004 856519004 C 1036 808800109 741811000 Attachment unit Satin foot unit Zipper foot unit Blind hem foot unit Overedge foot unit Bobbin Needle set unit Screw key Lint brush Seam ripper Buttonhole opener Spool holder Spool stand Spool pin Felt BH foot unit Power supply cord Foot control Instruction book Cover ...

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