Changing External Parts (1)
Contents
1. 1 Touch panel 2 LCD Harness 8 Printed circuit board F Black 4 Bobbin winder sensor Blue 5 Upper shaft sensor Black 6 Thread detection sensor Red 7 Presser foot lifter sensor Red Switching power supply White X Motor Blue Y Motor White Solenoid for thread tension Red Lamp White Inverter White DC Motoe White 9 9 6 Replacing Printed Circuit Board To remove 1 Remove the front cover See page 6 2 Pull out the connectors of printed circuit board F LCD Harness Inverter and Touch panel 3 Remove Screws 5 pieces 1 and the Printed circuit board A 2 with the Card guide To attach 4 Follow the above procedure reverse s 1 Screws 5 pieces scot 3 2 Printed circuit board EM jJ 8 Card guide Zi 20 Replacing Touch Panel 1 To remove 1 Remove the front cover See page 6 2 Pull out the Connectors of printed circuit board F 4 LCD Harness 5 and Inverter connector G 6 and Touch panel connectors 7 3 Remove Screws 2 4 pieces and remove the Touch panel 8 To attach 4 Place the Touch panel and press it against the Ribs A B C Fix the Touch panel 8 with the Fixing plate bottom 3 while press it against the Touch panel and tighten screws 2 5 Place the Fixing plate top 1 and s2. SERVICE MANUAL amp PARTS LIST MC300E JANOME TABLE OF CONTENTS MECHANICAL ADJUSTMENT Changing External Parts 1 Face Cover 1 Changing External Parts 2 Belt 2 Changing External Parts 3 Base 3 Changing External Parts 4 Bed Cover Base Lid 2 4 Changing External Parts 5 Base 5 Changing External Parts 6 Front 6 Changing External Parts 7 Rear Cover 7 Adjusting Needle Drop Position i 101i Ente Dose o 8 Ye iB si prae OOK RINI HEU RH TEN 9 Adjusting Needle Bar Height a ea 10 Adjusting Clearance between Needle and Hook 11 Adjusting Backlash between Hook Drive Gear and Lower Shaft Gear 12 Adjusting Upper Shaft Shield Plate Position 13 Adjusting Nedle Thread Tension ccccsssscccssececceeeecceececseeeeecsueeeeseueeeseeseessneessaaes 14 Adjusting Tension Release Mechanism cccccssscccceeseeccsececsueeeeseuseeseuseeeseuseessag
3. V 1 Screw 2 Tension release rod 2 3 Play 0 3 0 5 mm 4 Spring holder 5 Tension disc 6 Clearance approximately 1 0 mm Changing Thread Tension Unit Replacing the thread tension unit To remove 1 Remove the front cover unit See page 6 2 Remove Screws A 1 B 2 and remove the thread tension unit To attach 3 Follow the above procedure in reverse Note After the replacement adjust Thread Tension Release Machanism and Solenoid 1 Screw A 2 Screw B Replacing Threader Plate and Adjustment If the hook on the threader plate is damaged replace it asfollows To replace 1 Fig 1 Pry out the Threader plate holder 1 with screwdriver while pushing and holding the Threader knob 4 See fig 1 Align the groove on the new Threader plate holder D with the Pin 2 on the threader shaft Push the Threader plate holder 1 up until it snaps in place 1 Threader plate holder Pin 3 Hook 4 Threader knob Adjustment procedure 1 If the threader hook thrusts or hits against either left or right edge of the needle eye Loosen Screw A 1 and adjust the position of the Threader plate 2 See fig 2 If the threader hook thrusts against either top or bottom edge of the needle eye or misses the needle eye Remove the face cover and loosen Screw 3 Move the Threader position adjusting h
4. To remove 1 Remove the face cover and belt cover 2 Loosen Screws A 1 and B 2 Raise the handle and remove Screw C 8 and Cap 4 then remove Screw D 5 Remove the Rear cover 6 1 Screw A 2 Screw B 3 Screw C 4 Cap 5 Screw D 6 Rear cover To attach 3 Follow the above procedure in reverse Adjusting Needle Drop Position The needle should be positioned in the center of needle plate hole 1 Lower the Needle 3 to its lowest position by turning the handwheel 2 Remove the face cover and loosen Screw 1 move the Needle bar supporter 2 to the right or left until the needle 3 comes to the center of the Needle plate hole 4 3 Tighten the Screw 1 4 Attach the face cover 1 Screw 2 Needle bar supporter 3 Needle 4 Nedle plate hole Adjusting Hook Timing The amount of ascending travel of the needle bar from its lowest position to the position where the tip of the rotary hook meets the right side of the needle should be 3 1 to 3 7 mm M N OO OODONO Remove the belt cover bed cover base cover base lid 1 and base lid 2 Remove the presser foot Needle plate 1 and Bobbin holder 2 Lower the needle bar to its lowest position by turning the handwheel toward you Raise the needle bar further 3 4 mm 8 from the lowest position Loosen the Screws 3 of lower shaft gear turn the Lower shaf
5. and select the large A s of Gothic of the monogramming C1 O Lower the presser bar after the carriage moves to the sewing position 7 To unable the needle thread sensor insert a piece of paper 3 into the channel as shown 8 Run the machine and loosen Screws B 4 2 pieces While the carriage is moving in the direction of arrows 6 adjust the X Motor position where the lowest noise is obtained and tighten Screws B 4 firmly 9 Return the carriage to the stored position and turn the power switch OFF 10 Pull the X Y motor connectors out from the printed circuit board A then tighten screw A to place the Nylonclip 2 11 Connect the X Y motor connectors to the printed circuit board A again 12 Install the base unit Screw Nylon clip Insert a piece of paper Screw B X motor 93 5 3 09 CO Carriage moving in lateral direction Replacing Switching Power Supply 29 To remove 1 Remove the face cover belt cover front cover and rear cover 2 Remove Screws A 1 B 2 and remove the machine socket and fixing plate 3 Pull out the Machine socket unit connector 6 4 Remove Screw C 3 and remove the Idler 5 Remove Screws D 4 2 pieces and take out Switching power supply 7 To attach 6 Follow the above procedurte in reverse 1 Screw A 2 Screw B 3 Screw 4 Screw 5 Idler 6 Machine socket unit connector
6. D 4 pcs and remove the base unit 3 Disconnect the X Motor 2 and Y Motor 3 connectors from the printed circuit board A 1 Screws A 2 X motor connector Blue 3 Y motor connector White 4 Extension table Accessory To attach 4 Connect the X Y Motor Connectors 2 3 to the printed circuit board A 5 Insert the X Y Motor cords between the printed cuircuit board A and Arm Make sure that the cords should not be caught between the arm and base unit when attaching it then tighten Screws 1 4 pieces temporarily 6 Attach the Extension Accessory table 4 7 Tighten Screws A 1 while aligning the extension table base unit and free Arm 8 Attach the belt cover Changing External Parts 6 Front Cover Front cover To remove 1 Remove the face cover belt cover base cover and bed cover See page 1 4 2 Remove Screw A 1 and remove the Arm thread guide lower 2 3 Remove Screw 3 4 Loosen Screws 4 D 5 5 Disconnect each connector and remove the front cover Note Unlock the Hooks before removing the Front cover 1 Screw A 2 Arm thread guide Lower 3 Screw B 4 Screw C 4 5 Screw D 6 Hooks 4 spots To attach 6 Follow the above procedure in reverse Note See page 21 Diagram for Connectors Connection Changing External Parts 7 Rear Cover Rear cover
7. ace with fingers to check the rotary play If the play is larger than 0 8 mm or the gears do not turn smoothly adjust the backlash as follows Adjustment procedure 1 Hemove the bed cover See page 4 and loosen the Screw 1 Turn the Lower shaft bushing 2 Eccentric in the direction B when the play at shuttle hook tip is too small Turn the Lower shaft bushing 2 Eccentric in the direction A when the play at shuttle hook is too large Tighten Screw 1 securely after adjustment 1 Screw 2 Lower shaft bushing 8 The rotary hook play should be 0 8 mm or less Adjusting Upper Shaft Shield Plate Position The standard height of needle stop position should be 14 2 mm above the needle plate surface when the machine Is topped 1 Remove the front cover unit See page 6 2 Turn the power switch ON and press Start Stop button twice otop the machine with the needle in the up position A If the needle stops higher than 14 2 mm loosen Screw 1 and turn the Upper shaft shield plate 2 in the direction of A B If the needle stops lower than 14 2 mm 3 loosen Screw 1 and turn the Upper shaft shield plate 2 in the direction of B Place the right side of the Upper shaft shield plate 2 in the center of the slit of the Upper shaft sensor 4 and tighten Setcrew 1 Press the Start Stop button twice to check the height of the needle stop position th
8. ecure it with Screws 2 while pressing the Fixing plate top 1 against the Touch panel 8 Fixing plate Top Screw Fixing plate Bottom Printed circuit board F LCD Harness Inverter connector Touch panel connector Touch panel Rear side 39S OVO 21 Replacing Printed Circuit Board F 22 To remove 1 Remove the front cover See page 6 2 Pull out the connectors from the printed circuit board A 3 Remove Screws 1 2 pieces and remove the Printed circuit board F 2 To attach 4 Follow the above procedure in reverse 1 Screws 2 pieces 2 Printed circuit board F Adjusting Solenoid 1 Remove the front cover See page 6 2 Loosen Screws 1 2 pieces 3 Slide the Solenoid 2 to the right most position 4 Tighten Screws 1 1 Screw A 2 Solenoid 3 Tension disc 4 Tension disc holder Plunger 6 Slide to the right 5 To check tension release function Main ver T 00 K Q0 1 Y Slave 001 DC1 ver 1 00 00 a Turn the power switch ON while pressing the Brightness Foot UD Sensor or Start Stop button Touch panel indicates the Self Read Card J PH Sensor Check function keys as shown c Press the Solenoid key on the touch panel and it will indicate Solenoid Key d Press the Solenoid Key several times to check if Main Ver 1 00 K 001 Y the Tension disc 3 and Tension di
9. eedle eye Adjusting Clearance between Needle and Hook The clearance between needle and rotary hook should be 0 10 to 0 05 mm Remove the needle plate bobbin holder base cover and bed cover See page 3 4 Replace the needle with the Test 5 Loosen Screws A 1 B 4 C 2 and tighten Screw C 2 temporarily Turn the handwheel to bring the tip of the rotary hook behind the test pin Adjust the clearance between the Test pin 5 and the Tip of rotary hook 7 to 0 10 to 0 05 mm 6 by moving the Rotary hook set plate 3 up or down Tighten the Screws A 1 B 4 C 2 firmly Check the rotary hook driver gear and the lower shaft gear backlash If gears mesh or engage tightly or loosely check Adjusting Backlash between Hook Drive Gear and Lower Shaft Gear See page 12 Heattach the bed cover base cover base lid bobbin holder needle plate and needle Screw A Screw C Rotary hook set plate Screw B Test pin 0 10 to 0 05 mm Tip of rotary hook 309 9 Adjusting Backlash between Hook Drive Gear and Lower Shaft Gear The rotary play of the hook should be 0 8 mm or less Adjust the backlash after the adjustment of the clearance between needle and rotary hook 2 Q Ne To check 1 Turn the power switch OFF 2 Remove the base cover bed cover needle plate and bobbin holder 3 Jog the hook r
10. en attach the front cover 1 Screw 2 Upper shaft shield plate 3 14 2 mm 4 Upper shaft sensor 5 Needle 11 Adjusting Needle Thread Tension The standard upper thread tension should be 51 to 59 grams when the tension dial is set at 3 measured with a 50 polyester thread being pulled at approximately 110 mm sec in the direction of arrow 1 Set the Thread tension dial at 3 2 Lower the presser foot 3 Remove the front cover unit and adjust the thread tension A If the thread tension is more than 59 g turn the screw in the direction of B If the thread tension is less than 51 g turn the screw in the direction of A 1 Pulling direction Pulling speed 110 mm Sec 4 Attach the front cover unit Adjusting Tension Release Mechanism When the presser foot lifter is raised the tension release mechanism should work correctly If not adjust as follows 1 Remove the front cover unit see page 6 2 Lower the presser foot lifter set the thread tension dial at 9 and loosen the Screw 1 3 Adjust the play between the tension release rod 2 3 and the Spring holder 4 approximately 0 3 0 5 mm and tighten the Screw 1 4 Raise the presser foot lifter turn the thread tension V i B dial from 9 to 0 make sure the tension disc 5 n E i 9 d should open 1 0 mm mwd 5 Reattach the front cover unit
11. older 4 Up or down to adjust the hook position 1 Screw A 2 Threader plate 8 Screw B 4 Threader position adjusting holder 5 Needle bar Adjusting Height of Embroidery Foot Space between the needle plate and the bottom surface of the Foot P should be 1 0 to 1 6 mm when the needle bar is at its lowest position Remove the front cover unit See page 6 Lower the needle bar and lower the presser foot lifter Insert the 1 2 mm Thickness gauge 1 between the Embroidery Foot P 2 and the needle plate While pressing the Pressure bar actuator 8 down against the upper shaft cam loosen the Screw A 4 and push it down to the direction of arrow then tighten Screw A 4 again Heattach the rear cover 1 Thickness gauge 2 Embroidery foot P 3 Pressure bar actuator 4 Screw A 5 Needle 6 Needle plate Connector Connection Diagarm Please see the following connector connection diagram for the printed circuit board A Q 2 4 Scr T ui E m m 1 i i ut 1 8 Ld qu Ui Ie Kis gti v Ll cl 7 EM SEE asd Y itil ira a oy eo goes In We EE el gt iL 11 04 1 2778 mus mee J I P E d ra 1 nma CE iT Jr d al LLLI J p m L FTN v Hi hi TERRE
12. primary circuit 7 Switching power supply unit
13. s 15 Changing Thread Tension 16 Replacing Threader Plate and Adjustment 17 Adjusting Height of Embroidery Foot P esee 18 ADJUSTMENT FOR ELECTRICAL COMPONENTS Connector Connection Dig ON almi istuc eec eoe rao nme eri be e E Lo 19 Replacing Printed Circuit 20 Replacing TOUCH uia MT Uu MM 21 Replacing Printed GCIFGUIt Board F 3625 Epor in D 22 Solenoid a cie rad uos 23 Replacing DC Motor and Motor Belt Tension Adjustment 24 Replacing Carriage Plate Unit 25 Adjusting X and Y Sernsots iste cease ite 26 Adjusting X and Y Sensors Instant Adjustment 27 Adiusung X MOr Gear medo S D o deretur deed eau uae 28 Replacing Switching Power 29 Changing External Parts 1 Face Cover Replacing the face cover To remove 1 Remove the Cap 1 and Screw 2 and remove the Face Cover 3 1 Cap 2 Screw 3 Face cover To attach 2 Attach the Face Cover 3 and tighten Screw 2 then attach
14. sc holder 4 Slave Ver 001 DC1 Ver 1 00 open when the solenoid is activated e Press OK key solenoid f Attach the front cover Note Do not touch the Self Check function keys other than the Solenoid 23 Replacing DC Motor and Motor Belt Tension Adjustment 24 Replacing DC Motor To remove 1 Remove the belt cover See page 2 2 Remove the Motor belt 1 3 Disconnect the Motor connector 2 from the printed circuit board A 4 Remove Screws A 3 2 pieces and replace the motor To attach 5 Follow the above procedure in reverse Adjusting motor belt tension 1 Tighten Screws 3 2 pieces temporarily 2 Adjust the Belt deflection to about 5 0 mm 5 while pressing the middle of the motor belt with your finger with approximately 200 grams 4 of pressure 3 Tighten Screw 3 securely Motor belt Motor connector Screws Pressure 200 grams Deflection 5mm Replacing Carriage Plate Unit 25 To remove Turn the power switch ON and select the pattern No 1 Turn the power switch OFF and remove the Cover cap 1 Unlock the hook from the inside Turn the power switch ON to return the carriage to the home position Remove Screws 4 3 pieces and remove the carriage plate To attach Attach the carriage plate unit and tighten screws temporarily Adjust the carriage plate position so tha
15. t gear 4 until the Tip of rotary hook 6 meets with the right side of the Needle 5 Tighten Screws 2 pieces of the lower shaft gear Attach the Bobbin holder 2 Needle plate 1 and presser foot Attach the base lid 2 base lid 1 base cover bed cover and belt cover Needle plate Bobbin holder Screw Lower shaft gear Needle 14 Align the tip of rotary hook with the right side of the needle 3 1 to 3 7 mm Lowest position Adjusting Needle Bar Height The standard distance between the upper edge of the needle eye and the tip of the rotary hook should be in the range of 1 6 2 0 mm when the rotary hook meets the right side of the needle in ascending travel of needle from its lowest position Remove the presser foot Needle plate 1 and Bobbin holder 2 Remove the face cover Turn the handwheel to raise the needle bar from the lowest position until the tip of the rotary hook meets with the right side of the needle 7 Loosen Screw 3 Move the Needle bar 4 up or down to adjust the needle bar height Tighten the Screw 3 Be sure that the groove 5 on the needle bar is facing right in the front Attach the Bobbin holder 2 Needle plate 1 and presser foot Attach the face cover 1 Needle plate 2 Bobbin holder 8 Screw 4 Needle bar 5 Groove 6 Needle 14 7 Surface of hook race 1 6 2 0 mm 9 Rotary hook race Top of n
16. t its top surface is parallel and the same level with the bed surface Tighten the screws securely Attach the cover cap 1 1 Cover cap 2 Hook 3 Drop plate 4 Screws 5 Arm surface Adjusting and Y Sensors To adjust X and Y sensors 26 1 Turn the power switch ON The carriage is automatically set at starting position Turn the power switch OFF and then remove the base unit Loosen Screw A 1 and move the Y Sensor fixing plate 3 to adjust the carriage position Turn the power switch ON again to check if the Distance Y 2 is adjusted to 2 5 mm Tighten Screw A 1 Loosen screw B 4 and move the X shield plate 7 to adjust the carriage position X 1 5 and X 2 Turn the power switch ON again to check if the distance X 1 5 is adjusted to 69 5 mm and X 2 6 is adjusted to 2 5 mm Tighten Screw 4 6 Attach the base Screw A Y 2 5 mm Y Sensor fixing plate Screw B X 1 69 5 mm X 2 2 5 mm between the edge of carriage and Base 7 X shield plate Adjusting X and Sensors Simple Adjustment To adjust X and Y sensor without removing the base unit 1 Remove the base cover 2 Remove the presser foot holder and place the fabric on the Embroidery hoop A Attach the Embroidery hoop A on the carriage Place the Template 2 on the Embroidery hoop as shown 3 Turn the power swi
17. tch ON and select the pattern No 1 on the touch panel 4 Check that the Needle 3 goes into the Hole 4 in the Template 2 5 Turn the power switch OFF 6 If the needle drop position is slightly out of position in the Y direction loosen the screw A 1 and move the Y sensor fixing plate to adjust If the needle drop position is slightly out of position in the X direction loosen Screw B 5 through the hole of the Sheet cover fixing plate hole 7 and move the X shield plate 6 to adjust 7 Turn the power switch ON Select the pattern No 1 on the touch panel then check if the needle goes into the center of the hole in the Template 4 8 Return the carriage to the stored position then turn the power switch OFF 9 Remove the Template 2 and Embroidery hoop then install the base cover 1 Screw A 2 Template 3 Needle 4 Hole in the template 5 Screw B 6 X shield plate 7 Hole of the sheet cover fixing plate Y Sensor fixing plate 9 Y direction 0 X direction 27 Adjusting X If the machine is noisy when sewing an emb 28 Motor Gear roidery design adjust the X Motor as follows To remove 1 Remove the base unit See page 5 2 Remove the presser foot 3 Remove Screw A 1 and remove the Nylon clip 2 from the cords Adjustment procedure 4 Connect the X Y motor connectors to printed circuit board A Turn the power switch ON
18. the Cap 1 Changing External Parts 2 Belt Cover Replacing the belt cover To remove 1 Remove the 1 and Screw A 2 2 Loosen Screw B 3 3 Lay the machine down on its back and remove Screws C 4 and DG then remove the Belt cover D Cap 2 Screw A 3 Screw B 4 Screw C 5 Screw D 6 Belt cover To attach 4 Attach the Belt Cover with Screws A 0 2 5 5 Attach the Cap 1 Changing External Parts 3 Base Cover Replacing the base cover To remove 1 Remove Screws 1 4 pieces to remove the base cover 2 1 Screw 2 Base cover To attach 2 Follow the above procedure in reverse Changing External Parts 4 Bed Cover Base Lid 2 Replacing the bed cover To remove 1 Remove the base cover 2 Remove Screws A 1 2 pcs and remove the Base lid 1 2 3 Remove Screws B 9 2 and remove the Bed cover 4 1 Screw A 2 Base lid 1 3 Screw B 4 Bed cover To attach 4 Follow the above procedure reverse Replacing the base lid 2 To remove 1 Remove Screws 1 4 pieces and remove the Base 1 lid 2 2 1 Screw 2 Base lid 2 To attach 2 Follow the above procedure in reverse Changing External Parts 5 Base Unit Base To remove 1 Remove the Belt cover See page 2 2 Remove Screws A
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