Janome MC6300P Service Manual
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Janome MC6300P Service Manual

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SERVICE MANUAL
MC6300P

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  • Page 1 SERVICE MANUAL MC6300P...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS To remove face plate and top cover ................1 To remove belt cover and machine base..............2 To remove auto thread cutter cover................3 To remove front cover ....................4 To remove cover ......................5 To remove thread guide ....................6 To remove circuit board “A”...

  • Page 3: To Remove Face Plate And Top Cover

    TO REMOVE FACE PLATE AND TOP COVER Setscrew (B) Top cvoer Setscrew (C) Pressure dial Connector (D) Connector case Face plate Setscrew (A) Face plate [ To remove] Remove the setscrew (A) to remove the face plate. [ To attach] Attach the face plate with the setscrews (A).

  • Page 4: To Remove Belt Cover And Machine Base

    TO REMOVE BELT COVER AND MACHINE BASE Projection (F) Belt cover [ To remove ]: 1. Remove the setscrews (A), (B) and (C). Belt cover 2. Remove the belt cover [ To attach ]: 3. Insert the projections (D), (E) and (F) and tighten the setscrews (A), (B) and (C).

  • Page 5: To Remove Auto Thread Cutter Cover

    TO REMOVE AUTO THREAD CUTTER COVER [ To remove ]: Loosen the setscrew (A) and pull off the auto hread cutter cover. Setscrew (A) [ To attach ]: Replace the auto thread cutter cover and tighten the setscrew (A). Auto hread cutter cover...

  • Page 6: To Remove Front Cover

    TO REMOVE FRONT COVER [ To remove ]: Setscrew (A) 1. Remove the face plate, top cover and belt cover (refer to pages 1 and 2). 2. Loosen the setscrews (A), (B), (C) and (D). 3. Pull out the connectors (refer to page 10) and remove the front cover.

  • Page 7: To Remove Cover

    TO REMOVE COVER [ To remove ] 1. Remove the face plate and top cover (refer to Cover (D) page 1). 2. Loosen the setscrews (A) and (B). Setscrew (A) Remove the cover (D). [ To attach ] Reverse the above procedure. * Take care when removing and attaching the cover, as the right hand side of cover is held in position by the “C”...

  • Page 8: To Remove Thread Guide

    TO REMOVE THE THREAD GUIDE [ To remove ] Setscrew (A) Remove the face plate, and tilt the lamp socket (E) to the left. Remove the setscrews (A), (B) and (C), and emove the thread guide (D). [ To attach ] Reverse the above procedure.

  • Page 9: To Remove Circuit Board "A" And Fuse

    TO REPLACE CIRCUIT BOARD A AND FUSE [To remove] Mounting bracket 1. Remove the front cover (refer to page 4). Setscrew (A) Setscrew (D) 2. Remove the 4 setscrews (A). Setscrew Remove the circuit board A together with the mounting bracket. 3.

  • Page 10: To Remove Circuit Board "K

    TO REPLACE CIRCUIT BOARD K Connector of the [To remove] Setscrew speed control lever 1. Remove the front cover (refer to page 4). 2. Pull out the connector of the speed control lever. 3. Remove the 8 setscrews. [To attach] Reverse the above procedure.

  • Page 11: To Remove Tcircuit Board "F" And Speed Control Lever

    TO REPLACE CIRCUIT BOARD F AND SPEED CONTROL LEVER Circuit board F [To remove the circuit board F] 1. Remove the front cover (refer to page 4). 2. Pull out the connector from the circuit board A. (refer to page 7). 3.

  • Page 12: Connection Of Connectors

    CONNECTION OF CONNECTORS Lower shaft sensor (black 5 pins) Circuit board F Bobbin winder (black 7 pins) (black 4 pins) Presser bar switch (black 2 pins) Lamp Circuit board K (white 2 pins) (black 32 pins) Buttonhole sensor (black 3 pins) Auto thread cutter CIRCUIT BOARD A switch...

  • Page 13: To Adjust Needle Drop Position

    TO ADJUST NEEDLE DROP POSITION When the straight stitch is selected, the needle should be at the center of the hole of the needle plate. When the maximum zigzag width is selected, the distance between the needle and the edge of the hole of the needle plate at the right and left needle positions should be 0.2mm or more as shown in Fig.

  • Page 14: To Adjust Hook Timing

    TO ADJUST HOOK TIMING The movement of the needle from its lowest point to its highest point should be in the range of 3.25 to 3.55mm. [ To adjust ]: 1. Remove the machine base (refer to page 2) 2. Turn the power switch on and select stitch pattern No.

  • Page 15: To Adjust Needle Bar Height

    TO ADJUST NEEDLE BAR HEIGHT Before proceeding with this adjustment, check the hook timing (refer to page 12). The distance between the upper edge of the needle eye and the tip of the hook should be in the range of 1.6 –...

  • Page 16: To Adjust Clearance Between Needle And Rotary Hook

    TO ADJUST CLEARANCE BETWEEN NEEDLE AND ROTARY HOOK The clearance between needle and the tip of the rotary hook (J) should be between –0.1 and +0.05mm. [Adjustment I] 1. Remove the face plate, and attach a master needle (I). Hexagonal socket 2.

  • Page 17: To Adjust Backlash Between Hook Drive Gear And Lower Shaft Gear

    TO ADJUST BACKLASH OF HOOK DRIVE AND LOWER SHAFT GEARS The gears turns smoothly and rotary play of the hook should be 0.8 mm or less (F) when the tip of hook (E) is within the width of the feed dog (C) as shown below. 1.

  • Page 18: To Adjust Direction Of Presser Bar And Its Height

    TO ADJUST DIRECTION OF PRESSER BAR AND ITS HEIGHT When the presser foot is lifted, the distance between the surface of the needle plate and the bottom of the zigzag foot should be 6mm as shown in Fig 1. When the presser bar is lowered, the presser foot should be parallel with the holes for the feed dogs as shown in Fig.

  • Page 19: To Adjust Feed Dog Height

    TO ADJUST FEED DOG HEIGHT When the pressure adjusting dial is at “3” and the presser foot (A) is lowered, the highest position of the feed dog (B) should be 0.80 to 0.90 mm (C) from the surface of the needle plate (D). 1.

  • Page 20: To Remove Needle Thread Tension Unit

    TO REPLACE NEEDLE THREAD TENSION UNIT [ To remove ]: 1. Loosen the screws (A), (B), (C) and (D) Setscrew (A) on page 4 (it is not necessary to remove the connectors) 2. Remove the face plate. 3. Remove the setscrews (A) and (B). Remove the thread guide cover (C).

  • Page 21: To Adjust Tension Release Mechanism (1)

    TO ADJUST TENSION RELEASE MECHANISM (1) When the presser bar lifter is lifted, the opening between the tension discs (D) should be 0.8mm (C). 1. Remove the face plate and thread guide (refer to pages 1 and 6). 2. Loosen the setscrew (A). 3.

  • Page 22: To Adjust Tension Release Mechanism (2)

    TO ADJUST TENSION RELEASE MECHANISM (2) The tension release motor should open the tension discs 0.8mm. If not, adjust it as follows: 1. Remove the face plate, top cover and thread guide (refer to pages 1 and 6). 2. Set the tension dial at “9”. Mounting plate (D) 3.

  • Page 23: To Adjust Upper Thread Tension

    TO ADJUST UPPER THREAD TENSION The upper thread tension should be 65 - 80 grams when pulling the thread (white polyester thread size 50) at the speed of 110mm/sec with the tension dial at “4” (Make sure the foot is lowered.) 1.

  • Page 24: To Adjust Bobbin Winder

    TO ADJUST BOBBIN WINDER The amount of wound bobbin thread should be 16.5 – 19.5 (C) in diameter. 1. Loosen the setscrew (D), and turn the stopper (E) in the direction of: A, if the amount of thread is not enough. B, if the amount of thread is too much.

  • Page 25: To Adjust Needle Threader Plate

    TO REPLACE NEEDLE THREADER PLATE [ To remove ]: 1. Remove the foot holder. 2. Pull out the threader plate unit (A). [ To attach ]: 3. Push the threader plate unit (A) up to snap it with (Fig. I) the pin (B) as shown in Fig.

  • Page 26: Replacement Of The Thread Cutter Unit (New Type)

    Replacement of the Thread Cutter Unit (new type) The thread cutter mechanism was modified to improve the performance. If the thread cutter does not function well, replace the thread cutter unit. When replacing old type of the thread cutter with new one, replace also the arm (1) with new type.

  • Page 27: Replacement Of The Thread Cutter Unit (Old Type)

    TO REPLACE AUTO THREAD CUTTER (Old type) Hole of auto thread cutter Pin (B) Setscrew (A) [To remove]: Remove the needle plate, machine base and auto thread cutter cover (refer to pages 2 and Remove the 2 setscrews (A) and remove the auto thread cutter.

  • Page 28: To Adjust Position Of Sliding Plate

    TO ADJUST POSITION OF SLIDING PLATE Sliding plate (D) Set the needle bar at the lowest position. Insert the pin (B) into the groove of the cam (A) by pushing down the driving arm (1). In this state, turn the hand wheel to set the sliding plate (D) at the rightmost position.

  • Page 29: To Adjust Thread Supply Control Lever

    TO ADJUST THREAD SUPPLY CONTROL LEVER The distance from the bobbin holder to the thread supply control lever should be between 1.15 and 1.45mm. Thread supply control lever (A) 1. Remove the needle plate. 2. Turn the hand wheel toward you until the thread supply control lever comes to its lowest position.

  • Page 30: Setting Position Of Thread Take Up Lever

    SETTING POSITION OF THREAD TAKE UP LEVER Insert the needle bar crank into the take up crank so that the flat part of the needle bar crank (D) Setscrew (A) – short faces the setscrew (B). Then tighten the setscrew (B).

  • Page 31: To Adjust The Upper Shaft Declutch Device

    TO ADJUST UPPER SHAFT DECLUTCH DEVICE [ Correct position of the upper shaft declutch 12.3 device (E)] degrees (B) When the flat part of the upper shaft (C) is leveled, the take up crank (D) should be at the angle of 12.3 degrees (B).

  • Page 32: Setting Positions Of Parts On Lower Shaft

    SETTING POSITIONS OF PARTS ON LOWER SHAFT The setting positions of the parts on the lower shaft are as shown below. The setting angle of the parts (A), (B) and (C) is the same as (D). Spring pin (D) Feed cam (C) Cam (B) Belt wheel Feed lifting cam...

  • Page 33: Setting Positions Of Upper And Lower Shafts

    SETTING POSITIONS OF UPPER AND LOWER SHAFTS When the setting mark (A) on the cam (B) is exactly at the top, the spring pin (E) is vertically straight and the setting mark (C) on the belt wheel (D) should be in the position as shown. Setting mark (A) Cam (B) Setting mark (C)

  • Page 34: To Replace Driving Motor

    TO REPLACE DRIVING MOTOR [To remove]: 1. Remove the front cover (refer to page 4). 2. Remove the motor belt. 3. Pull out the connector from the circuit board A. 4. Remove the 2 setscrews (A) and pull out the driving motor.

  • Page 35: To Adjust Zigzag Timing

    TO ADJUST ZIGZAG TIMING When the machine is set for zigzag stitching, the needle should start to zigzag 8.0 mm to 8.4 mm (C) = height of zigzag foot) above the surface of the needle plate. 1. Set the machine for adjusting mode by turning the power switch while pressing the needle up/down and the lock stitch buttons at a time.

  • Page 36: To Adjust Buttonhole Lever Position

    TO ADJUST BUTTONHOLE LEVER POSITION 1. While pressing the needle up/down and lock stitch keys, turn the power switch on. Press the stitch “34” within 3 seconds. 2. Remove the face plate (refer to page 1). Lower the buttonhole lever (C). 3.

  • Page 37: To Adjust Stretch Stitch Feed Balance

    TO ADJUST STRETCH STITCH FEED BALANCE When the number 8 is sewn 5 times with the stretch stitch balance dial (C) at the setting mark (D), the measurement should be between 32 and 38mm as shown in Fig. 1. Fig. II Setting mark (D) [ To adjust ]: 1.

  • Page 38: To Adjust Presser Bar Foot Lifter Switch Position

    TO ADJUST PRESSER BAR LIFTER SWITCH POSITION 1. While pressing the needle up/down and lock stitch buttons, turn the power switch on. Press the stitch length (minus) button“ “ in 3 seconds. 2. Press the stitch length (plus) button “ “.

  • Page 39: To Adjust Auto Thread Cutter Switch Position

    TO ADJUST AUTO THREAD CUTTER SWITCH POSITION 1. While pressing the needle up/down and lock stitch buttons, turn the power switch on. Press the zigzag width minus button “ ” within 3 seconds. 2. Press the stitch length plus button “ “...

  • Page 40: To Adjust Position Of Solenoid For Upper Shaft Declutch Device

    TO ADJUST POSITION OF SOLENOID FOR UPPER SHAFT DECLUTCH DEVICE The distance between the upper surface of the yoke (A) and the snap ring on the plunger (B) should be 5mm (C) when the upper shaft declutch device is activated. Plunger (B) 1.

  • Page 41: To Adjust Postion Of Solenoid For Auto Thread Cutter

    TO ADJUST POSITION OF SOLENOID FOR AUTO THREAD CUTTER The distance between the yoke (A) and the snap ring on the plunger (B) should be 2.5mm. Setscrews (D) 1. Remove the machine base (refer to page 2). 2. Loosen the 2 setscrews (D) and adjust the distance to 2.5 mm (C) by moving the setting plate (E).

  • Page 42: To Adjust Position Of Solenoid For Bobbin Idling Prevension Lever

    TO ADJUST POSITION OF SOLENOID FOR BOBBIN IDLING PREVENSION LEVER The distance between the yoke (A) and the snap ring on the plunger (B) should be 3mm (C). Yoke (A) Setscrews (D) 1. Remove the machine base (refer to page 2). 2.

  • Page 43: Diagnosis Chart

    DIAGNOSIS CHART Note: 1. This diagnosis device is provided for the purpose of checking the circuit boards A and K and the functions of this sewing machine. 2. The power switch must be turned off when replacing parts. 3. The language on the LCD is English only. Preparation 1.

  • Page 44: Function Buttons

    1. Number, LED, LED lamp & Buzzer [Faulty condition] [Correct condition] The buzzer does not sound. 1) Buzzer sounds It does not go to the next step. 2) The number LED and LED Number LED and LED do not blink. lamp blink at 1 second interval.
  • Page 45 3. Switch [Correct condition] [Faulty condition] Bobbin winder Bobbin winder lever at right lever at left (1) Bobbin winder switch The LED does not change, or (SP) it shows conversely. Move the bobbin winder Adjust the position of the switch, or lever to the right and left.
  • Page 46 4. Photo sensor [Faulty condition] [Correct condition] Buttonhole lever the LED does not change. (1) Buttonhole sensor (bh) LED shows: Front Center Rear [H] when the buttonhole lever is pulled toward you. Adjust the position of the shield [L] when the buttonole lever is plate and/or photo sensor.
  • Page 47 [Faulty condition] 4. Speed control slider (Uo) [Correct condition] The LED does not change, or Slide the speed control slider to the left and right. The figure on it shows conversely. the LED should be as follows: Replace the speed control slider, 000 - 002 at the left most circuit board K and/or circuit postion...
  • Page 48 9. Stepping motor (St) [Correct condition] [Faulty condition] 1) When the memory button is The machine does not initialize and pressed with the needle bar at the LED shows [E1]. “UP” position, the needle bar vibrates and the the needle drop Check if there is any tight spot in is set at “M”...

  • Page 49: How To Find The Version Of The Operating System Program Of The Machine

    How to find the version of the operating system program of the machine While pressing the up/down needle position button and lock stitch button at the same time, turn the power switch Press the stitch 16 button twice within 3 seconds (If not pressed within 3 seconds, machine will be in default setting.) The LED shows the version by scrolling.

  • Page 50: When The Feed Dog Does Not Return To "Up" Position

    When the feed dog does not return to “UP” position Projection of feed lifting 1. Function of the drop feed lever 1) Remove the machine base. 2) Set the needle bar at the lowest position. (The projection of the feed lifting cam is visible at this position.) 3) When the drop feed lever is moved left and right, the feed lifting cam should move accordingly.

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Nh8460

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