Janome MC9900, Service Manual

Page 1: ...SERVICE MANUAL PARTS LIST MC9900...

Page 2: ...rive gear and lower shaft gear 16 Needle drop position 17 Hook timing 18 Needle bar height 19 Upper shaft shield plate position 20 Upper thread tension 21 Tension release mechanism 22 Needle threader...

Page 3: ...e the face cover To attach 1 Follow the above procedure in reverse Belt cover To remove 1 Remove the cap and setscrew A 2 Loosen the setscrews B and C Remove the belt cover To attach 1 Follow the abov...

Page 4: ...e fig 2 3 Remove the setscrew B and C 3 Open the face cover Close the top cover Raise the carrying handle and remove the top cover To attach 1 Follow the above procedure in reverse To attach the flang...

Page 5: ...1 Follow the above procedure in reverse Base plate Fig 1 Rail cover Setscrews Setscrews Base cover Fig 2 Base cover To remove 1 Slide the rail cover in the direciton of arrow to remove the rail cover...

Page 6: ...1 Follow the above procedure in reverse Bed cover Setscrew Fig 1 Fig 2 Needle plate Free arm cover Free arm cover To remove 1 Remove the needle and presser foot holder 2 Press down the needle plate re...

Page 7: ...hooks from the machine Remove the free arm cover To attach 1 Follow the above procedure in reverse Match the hooks and holes of the machine Press down the free arm cover firmly and slide it to the rig...

Page 8: ...ush the rear cover through the holes F and G with a screwdriver to remove the hook of rear cover 4 Remove the front cover To attach 1 Follow the above procedure in reverse Changing External Parts 6 Fi...

Page 9: ...t cover top cover and base cover see pages 1 2 and 3 3 Loosen the setscrews A and B see fig 1 Remove the setscrews C see fig 2 4 Push the rear cover from the holes D and E with a screwdriver to remove...

Page 10: ...wn Foot control External thread cutter jack Power switch White Printed circuit board A connection Slide volume White Printed circuit board L1 White Printed circuit board L2 Red Face cover lamp Printed...

Page 11: ...board B USB board To remove 1 Remove the belt cover and base plate see pages 1 and 3 2 Loosen the setscrew Remove the cord guide plate see fig 1 3 Pull out the connector of printed circuit board B fro...

Page 12: ...y unit see fig 2 4 Disconnect the power supply connector from the switching power supply unit see fig 3 5 Remove the setscrews B C and D see fig 3 Remove the switching power supply To attach 1 Follow...

Page 13: ...ronic components To attach 1 Attach the driving motor Tighten the setscrews temporarily 2 Adjust the motor belt deflection to about 5 mm by pressing the middle of the motor belt with approximately 200...

Page 14: ...on the thread tension release lever see fig 1 4 Remove the setscrews A and B see fig 2 and 3 Remove the thread tension unit To attach 1 Follow the above procedure in reverse Check the following parts...

Page 15: ...to raise the feed dog at its highest position 4 Loosen the setscrew A 5 Loosen the nut Adjust the feed dog height to 0 85 mm by turning the adjusting screw 6 Tighten the nut and setscrew A 7 Attach t...

Page 16: ...factory setting mode Press Bobbin key The stitch width will be set at 9 0 5 Turn the handwheel toward you Adjust the clearance between the needle and the tip of the rotary hook by moving the needle b...

Page 17: ...plate up or down between 0 1and 0 05 mm at the both left and right needle position see page 14 4 Tightent the setscrews A B and C Check the following parts after this adjustment Check the backlash be...

Page 18: ...lash is too much or too little loosen the hexagonal socket screw C and D and following the adjustment procedure If the backlash is too great more than 0 8 mm turn the both lower shaft bushings in dire...

Page 19: ...drop position is set at 4 5 and the clearance between the side of the needle and the needle hole is 0 2 mm or more when the needle position is set at 0 0 and 9 0 see fig 1 If this is not the case adj...

Page 20: ...to prevent damaging the needle plate when removing 4 Remove the bed cover see page 4 5 Turn the handwheel toward you to lower the needle at its lowest position 6 Loosen the setscrews of the lower shaf...

Page 21: ...edle bar height 6 Tighten the hexagonal socket screw Be sure that the needle settimg groove is facing the front Be careful not to turn the needle bar when tighting the screw 7 Attach the bobbin holder...

Page 22: ...ve the surface of the needle 5 Loosen the setscrew A of the lower shaft shield plate Turn the upper shaft shield plate away from you slightly then turn upper shaft shield plate toward you slowly until...

Page 23: ...switch ON while pressing the start stop button and reverse stitch button Press BH sensor key 3 Press Free key The tension disc will be opened with the presser foot lowered 4 Thread white polyester th...

Page 24: ...cover front cover and base cover see page 1 2 3 and 6 2 Attach the presser foot A Lower the presser foot 3 Turn the power switch off Turn the thread tension gear until the convex part of tension gear...

Page 25: ...the needle threader plate line the groove up with the pin B and push it up to snap it To adjust 1 If the hook on the threader plate touches the left or right side of the needle eye loosen setscrew C...

Page 26: ...lder see page 4 5 You may use a fabric to prevent damaging the needle or the presser foot holder when removing the needle plate 2 Loosen the hexagonal bolt Adjust the distance between the lower part o...

Page 27: ...ide adjustment 1 Adjust the clearance between the stopper and the presser foot slider to 2 6 mm Lower the presser foot 2 Lower the BH lever Loosen the setscrew A Move the buttonhole lever left and rig...

Page 28: ...se the presser foot for this adjustment otherwise you cannot adjust the presser foot height correctly 4 Open the face cover Loosen the setscrew on the presser bar suporter to adjust the presser foot d...

Page 29: ...r foot Turn the handwheel toward you to lower the embroidery foot P at its lowest position 5 Loosen setscrew of presser bar link see fig 1 6 Place the 1 2 mm spacer block between the presser foot and...

Page 30: ...ot Sen Feed Dog key 5 Loosen the setscrew C Move the printed circuit board G1 slowly left or right until the P Foot changes from H to L or L to H Tighten the setscrews see fig 3 To check 1 Lower the d...

Page 31: ...release hook from the convex part 6 Lower the presser foot lifter Loosen the setscrew B Adjust the presser foot detecting switch position so the Foot U D should change from L to H when the presser fo...

Page 32: ...ss Foot Sen Feed Dog key 7 Attach the knee lifter 8 Push the knee lifter to the right as far as it goes and hold it Loosen the setscrew B and adjust the thread release plate for knee lifter position s...

Page 33: ...and 5 2 Turn the power switch off Slide the moving cutter to the right with your finger 3 Turn the power switch on The moving cutter motor is initialized and moving cutter moves to its home position...

Page 34: ...older diameter 8 4 mm 5 Rotate the bobbin holder couterclockwise so that the knob fits to the stopper in the hook race 6 Press Key and read Key value 7 Repeat the procedure 5 to 6 above few times Pres...

Page 35: ...y 2 Connect the needle plate sensor switch connector to the printed circuit board A 3 Check the needle plate sensor and adjust as necessary see the adjustment procedure below 4 Tighten the setscrews T...

Page 36: ...ed 6 Replace the needle plate with the needle plate for straight stitch Be sure that Straight indicates H and Zigzag indicates L If not adjust the micro switch base plate position see page 33 To remov...

Page 37: ...adjust eveness of thread amount 1 Turn the thread guide screw to adjust the eveness of thread amount see fig 2 If the thread amount of the lower part of bobbin is smaller than its upper part turn the...

Page 38: ...e factory setting mode Press 8 Adjust key 4 Sew the patterns at the maximum speed until the machine stops automatically The machine will sew 8 eight times Check the length between the 3rd 8 and 7th 8...

Page 39: ...point where you can access the Y fixing plate from the inspection hole 4 Loosen the setscrew 5 Tighten the setscrew while pushing the Y fixing plate in the direction of arrow see fig 3 6 Be sure that...

Page 40: ...le moves to the left needle position and the hoop moves to its starting position Default position X 850 Y 1000 6 Adjust the hoop position so that the needle drops to the center of the template hole Pr...

Page 41: ...e start position and the initial X value 1250 is indicated The initial X value is 1250 5 Press key or to move the cloth guide to the position 15 mm away from the center needle position Adjust the X va...