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Service Manual & Parts List Model: Nh60

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Service Manual & Parts List Model: Nh60 SERVICE MANUAL & PARTS LIST MODEL: NH60 1 INDEX LOCATE AND IDENTIFY PARTS ..................................................................................................3 WIND THE BOBBIN ......................................................................................................................4 PREPARE YOUR TOP THREAD ...................................................................................................5 LCD DISPLAY ...............................................................................................................................6 WHAT TO DO WHEN ................................................................................................................ 7-9 CHANGING EXTERNAL PARTS FACE COVER..............................................................................................................................10 FREE-ARM COVER ...................................................................................................................11 FRONT COVER .................................................................................................................... 12-13 REAR COVER .............................................................................................................................14 MECHANICAL ADJUSTMENT PRESSER 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 POSITION ........................................................................33 PARTS LIST .......................................................................................................................... 34-47 2 LOCATE AND IDENTIFY PARTS BOBBIN WINDER SPOOL PIN SPINDLE THREAD BOBBIN WINDER TENSION DIAL STOPPER FACE COVER VALUE SET BUTTONS THREAD CURSOR BUTTONS CUTTER LCD DISPLAY SPEED CONTROL SLIDER NEEDLE THREADER NEEDLE POSITION UP/ DOWN BUTTON AUTO-LOCK BUTTON NEEDLE PLATE REVERSE STITCH BUTTON START/STOP BUTTON EXTENSION TABLE PRESSER FOOT HOLDER NEEDLE CLAMP NEEDLE CARRYING HANDLE PRESSER FOOT HANDWHEEL PRESSER FOOT LIFTER POWER SWITCH FOOT CONTROL JACK FREE ARM MACHINE SOCKET DROP FEED LEVER 3 WIND THE BOBBIN 1. Hold the thread with both hands and pass the bobbin winding tension disc (1). 2. Pass the thread through the hole in the bobbin from the inside to the outside. Put the bobbin on the bobbin winder spindle (2). 3. Push the bobbin winder spindle to the right. 4. Hold the free end of the thread in your hand and start the machine. Stop the machine when the bobbin has been wound a few layers, and cut the thread close to the bobbin. 5. Start the machine again. When the bobbin is fully 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. (2) (1) 1. Place a bobbin in the bobbin holder with 2. Guide the thread into notch on the front the thread running off counterclockwise. side of the bobbin holder. Draw the thread to the left, sliding it between the tension spring blades. 1/8 3/8 5/8 10 3. Continue to draw the thread lightly until 4. Attach the hook cover plate. Check the the thread slips into notch. Pull out threading by referring to the diagram about 6˝ (15.0 cm) of thread. shown on the hook cover plate. 4 PREPARE YOUR TOP THREAD * Raise the thread take-up lever to its highest position by turning the handwheel counterclockwise. * Raise the presser foot lifter. * Place a spool on the spool pin, with the thread coming off the back of spool. 1 3 4 2 5 1. Draw the end of the thread around the 2. While holding the thread near the spool, upper thread guide. draw the end of the thread down around the check spring holder. 3. Firmly draw the thread up from right to 4. Draw the thread through the thread guide. left over the take-up lever, and down into Slide the thread behind the needle bar thread the take-up lever eye. guide on the left. 5. Thread the needle from front to back, or use a needle threader. 5 LCD DISPLAY The LCD display shows the following information when the machine is turned on. q STITCH pattern NUMBER w CURSORS e STITCH WIDTH r STITCH LENGTH z Press the cursor key to move the cursor under the stitch pattern number. The cursors 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 you press the value set key. q w e r z x c 6 WHAT TO DO WHEN CONDITION Cause How to FIX REFERENCE 1. SKIPPING 1. Needle is not inserted Insert the needle properly. STITCHES properly. 2. Needle is bent or worn. Change the needle. 3. Incorrectly threaded. Rethread. 4. Needle or thread are Use the recommended sewing inappropriate for the needle and thread. fabric being sewn. 5. Sewing on Use a HA x #11 blue tip needle. stretch fabric. 6. Inappropriate needle See mechanical adjustment “Needle P. 1 9 bar height. bar height”. 7. Inappropriate needle to See mechanical adjustment P. 1 7 hook timing. “Adjustment of hook timing”. 8. Inappropriate needle to See mechanical adjustment P. 2 0 hook clearance. “Clearance between needle and tip of the rotary hook”. 9. Hook is damaged or too See mechanical adjustment P.18 worn. “Replacing hook”. 2. FABRIC 1. Incorrect feed dog Adjust the presser bar level to make P. 2 1 NOT height. the pressure stronger. MOVING See mechanical adjustment “Feed dog height”. 2. Feed dog is in down Raise the feed dog. position. 3. Thread on bottom side of Make sure to bring both needle and fabric is jammed up. bobbin threads under the foot when start sewing. 4. Feed dog teeth are worn. Change the feed dog. 7 CONDITION Cause How to FIX REFERENCE 3. BREAKING 1. Initial sewing speed is Start with medium speed. UPPER too fast. THREAD. 2. Thread path is incorrect. Use the proper thread path. 3. Needle is bent or dull. Replace with a new needle. 4. BREAKING BOBBIN 4. Top tension is too strong. Adjust top tension correctly. THREAD. 5. Needle size is Use appropriate needle for fabric inappropriate for fabric. and thread in use. 6. Needle eye is worn. Change the needle. 7. Needle hole in needle Repair the hole or replace the plate is worn or burred. needle plate. 1. Bobbin holder is incorrectly threaded. 2. Too much thread is wound on the bobbin. 3. Lint is stuck inside the bobbin holder. 4. Thread quality is too low. 5. Thread is jamming around the bobbin holder. 5. NEEDLE 1. Needle is hitting the See mechanical adjustment P. 1 6 BREAKS needle plate. “Needle drop position”. 2. Needle is bent or worn. Change the needle. 3. Needle is hitting the hook. See mechanical adjustment P. 2 0 “Clearance between needle and tip of the rotary hook”. 4. Fabric is being pulled Guide the fabric gently while too strongly while sewing. sewing. 8 CONDITION Cause How to FIX REFERENCE 6. NOISY 1. Backlash between hook Eliminate the backlash. OPERATION gear and lower shaft gear is too great. 2. Lower shaft gear is loose. Eliminate the looseness. 3. Inappropriate belt See part removal and tension. replacement “Driving motor (DC motor)”. P. 3 1 4. Not enough oil. Oil all moving parts. 5. Upper shaft gear is loose. Eliminate the looseness. 6. Hook is damaged or too See mechanical P.18 worn. adjustment “Replacing hook”. 7. DEFORMATION 1. Inappropriate feed Adjust the feed balancing screw. PATTERN balance. 2. Top tension is too strong. See mechanical adjustment P. 2 2 “Top tension”. 9 CHANGING 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) 10 CHANGING EXTERNAL PARTS FREE-ARM cover TO remove: 1. Loosen the setscrew (1)
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