Janome MC6700P Service Manual
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Janome MC6700P Service Manual

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PFirst Edition: 05 September 2017
SERVICE MANUAL
MC6700P

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Summary of Contents for Janome MC6700P

  • Page 1 PFirst Edition: 05 September 2017 SERVICE MANUAL MC6700P...

  • Page 2: Table Of Contents

    INDEX Changing external parts Face plate ................................. 1 Top cover ................................1 Belt cover ................................. 2 Base ................................. 2 Power supply cover ............................3 Thread cutter cover ............................3 Front cover ............................... 4 Thread guide coverr ............................5 Arm thread guide (unit) ............................. 6 Replacing Electronic Components Changing the printed circuit board A ........................

  • Page 3: Changing External Parts

    Changing external parts (1) Face plate To remove and attach the: 1. Remove the setscrew A to remove the face plate. fix the face plate with the setscrew A. Setscrew A Face plate Top cover To remove: 1. Remove the setscrews B (2 pcs.) . Setscrew B Setscrew B Top Cover...

  • Page 4: Belt Cover

    Changing external parts (2) Hook Belt cover Belt cover To remove: 1. Remove the top cover. Remove the caps and setscrews A (2 pcs.). 2. Loosen the setscrew B and remove the belt cover. Setscrew A To attach: 3. Attach the belt cover and tighten the setscrews A Hook (2 pcs.) and setscrew B.

  • Page 5: Power Supply Cover

    Changing external parts (3) Power supply cover To remove: 1. Remove the setscrews A (3 pcs) and remove the power supply cover. Setscrew A To attach: 2. Fix the power supply cover with setscrews A (3 pcs.). Power supply cover Setscrew A Thread cutter cover Hook...

  • Page 6: Front Cover

    Changing external parts (4) Front cover To remove: Remove the face plate, top cover and belt cover. 2. Loosen the setscrews A, B, C, D and E (5 pcs.). 3. Disconnect the LCD connector and printed circuit board K connectors (2 pcs.) from the printed circuit Setscrew A board A, and remove the front cover.

  • Page 7: Thread Guide Coverr

    Changing external parts (5) Thread guide cover To remove: 1. Remove the face plate and top cover. Thread guide cover Setscrew A 2. Loosen the setscrews A and B, and remove the thread guide cover. To attach: 3. Follow the steps of removal procedure in reverse. Setscrew B Slit Thread guide...

  • Page 8: Arm Thread Guide (Unit)

    Changing external parts (6) Arm thread guide (unit) To remove: Remove the face plate, top cover and thread guide cover. Setscrew A 2. Loosen the setscrews A and B, and remove the arm thread guide (unit). To attach: 3. Follow the steps of removal procedure in reverse. Setscrew B Arm thread guide (unit)

  • Page 9: Changing The Printed Circuit Board A

    Changing the printed circuit board A To remove: Printed circuit board A 1. Remove the front cover. Setscrew A Setscrew A 2. Remove the setscrews A (4 pcs.) and disconnect all the connectors from the printed circuit board A, and remove the printed circuit board A.

  • Page 10: Changing The Printed Circuit Board K

    Changing the printed circuit board K To remove: 1. Remove the front cover. Connector for printed circuit board F 2. Disconnect the connector for printed circuit board F. 3. Remove the setscrews A (6 pcs.) and printed circuit board K. 4.

  • Page 11: Changing The Printed Circuit Board F And Slide Volume

    Changing the printed circuit board F and slide volume Printed circuit board F To remove: Connector for printed 1. Remove the front cover. circuit board F 2. Disconnect the connector for printed circuit board F and slide volume connector. Setscrew A 3.

  • Page 12: Changing Lcd

    Changing LCD To remove: Setscrew A 1. Remove the front cover. 2. Remove the setscrews A (4 pcs.) and remove the LCD. To attach: 3. Follow the steps of removal procedure in reverse. Setscrew A...

  • Page 13: Wiring Diagram

    Wiring diagram Refer to the board A schematic for locating the connectors on the printed circuit board A. ErP connector (green 2P) Foot control (white 2P) LED (arm) (blue 2P) (Switching power supply) LED (arm) (red 2P) Bobbin winder motor (black 4P) LED (face plate) (white 2P) (Programming) LCD (white 16P)

  • Page 14: Needle Drop Position

    Needle drop position When the straight stitch is selected, the needle should be positioned in the center of the needle plate hole. When the zigzag stitch is selected with the maximum stitch width of 9.0, the clearance between the side of the needle and needle hole should be 0.2 mm or more. 1.

  • Page 15: Backlash Between Hook Drive Gear And Lower Shaft Gear

    Backlash between hook drive gear and lower shaft gear The gears turn smoothly and rotary play of the hook should be 0.8 mm or less when the tip of hook is within the width of the feed dog as shown below. 1.

  • Page 16: Hook Timing

    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 exactly meets the right side of the needle in the left needle position (“0.0”) should be 3.70 to 4.00 mm. 1.

  • Page 17: Adjustment Of Needle Bar Height

    Adjustment of needle bar height Before proceeding with this adjustment, check the hook timing. The distance between the upper edge of the needle eye and the tip of the hook should be in the range of 1.6 - 2.0mm when the tip of the hook meets right side of the needle in the left needle position (“0.0”) as the needle ascends from its lowest position.

  • Page 18: Clearance Between Needle And Tip Of The Rotary Hook

    Clearance between needle and tip of the rotary hook The clearance between needle and the tip of the rotary hook should be between -0.10 and +0.05 mm. Clearance adjustment 1 1. Remove the top cover and face plate. 2. Remove the needle, needle plate and bobbin holder. 3.

  • Page 19: Clearance Between Needle And Tip Of The Rotary Hook

    Clearance between needle and tip of the rotary hook The clearance between needle and the tip of the rotary hook should be between -0.1 and +0.05 mm. Clearance adjustment 2 1. Remove the base. Hook setting plate 2. Loosen the setscrews A, B and C, and tighten setscrew C lightly.

  • Page 20: Adjustment Of Height And Direction Of Presser Bar

    Adjustment of height and direction of presser bar The clearance between the presser foot and the surface of the needle plate should be 6.0 mm when the presser foot is raised. The presser foot should be parallel to the slot of the feed dog teeth when attached. 1.

  • Page 21: To Adjust The Feed Dog Height

    To adjust the feed dog height When the pressure adjusting dial is at “3” and the presser foot is lowered, the highest position of the feed dog should be 0.80 to 0.90 mm from the surface of the needle plate. To adjust: 1.

  • Page 22: To Replace Needle Thread Tension Unit

    To replace needle thread tension unit To remove: 1. Remove the top cover, face plate, thread guide cover and arm thread guide. Thread tension 2. Lower the presser foot lifter. release arm 3. Loosen the hexagonal socket screw A. Thread 4.

  • Page 23: To Adjust The Upper Thread Tension Release (1)

    To adjust the upper thread tension release (1) The clearance of upper thread tension disks should be 0.8 mm when the presser foot is raised. 1. Remove the top cover, face plate, thread guide cover and arm thread guide. Thread tension disk 2.
  • Page 24 To adjust the upper thread tension release (2) Upper thread tension disks should open 0.8 mm when the tension release motor operates. If not, adjust follows. 1. Remove the top cover, face plate and thread guide Base (Fig. 1) Setscrew C cover.

  • Page 25: Adjusting The Bobbin Thread Tension

    Adjusting the bobbin thread tension The upper thread tension should be 75 - 90 grams when pulling the thread (white polyester thread size 50) at the speed of 110 mm/sec. with the tension dial at “4”. 1. Set the thread tension dial at “4”. Tension dial 2.

  • Page 26: To Adjust The Bobbin Winder Stopper

    To adjust the bobbin winder stopper The diameter of thread wound on bobbin should be 16.5 to 19.5 mm. 1. To adjust the thread amount for bobbin, loosen the setscrew and turn the bobbin winder stopper Turn the bobbin winder stopper in the direction of (A) when the thread amount for bobbin is too large.

  • Page 27: Needle Threader Hook Position

    Needle threader hook position The threader hook comes out through the needle eye from behind when the needle threader lever is lowered. 1. Push down the threader lever and hold it just before the threader hook enters the needle eye. 2.

  • Page 28: Thread Cutter Switch

    Thread cutter switch The distance between the end of thread cutter plate slit and the end of moving cutter should be in the range of 0.4 to 1.2 mm. 1. Turn the poewr switch off. End of thread End of moving cutter Remove the needle plate, base and thread cutter cutter plate slit Moving cutter...

  • Page 29: To Adjust Thread Drawing Lever

    To adjust thread drawing lever The maximum height of the thread drawing lever should be between 5.5 to 5.7 mm. 1. Remove the needle plate. 2. Loosen the hexagonal socket screw. Thread drawing lever When the thread drawing lever is at the highest position, adjust the drawing lever so that the distance between bobbin holder and the drawing lever is 5.5 - 5.7 mm.

  • Page 30: Upper Feed Dog

    Upper feed dog (1) The clearance between the upper feed link shaft and upper feed lower shaft should be 2.5 mm when the upper feed adjusting dial is set to “0”. To check 1. Turn the power switch on and select the straight stitch #1 ( ).
  • Page 31 Upper feed dog (2) After adjusting the clearance between the upper feed link shaft and upper feed lower shaft, adjust the horizontal position of upper feed dog. 1. Attach the dual feed foot. 2. Turn the power switch on and select the straight stitch #1 ( ).
  • Page 32 Upper feed dog (3) The needle tip should be 0 to 1 mm above the surface of the needle plate when the toe of the dual feed foot touch the needle plate. To check: 1. Attach the dual feed foot and needle #14. 2.
  • Page 33 To adjust: 1. Follow steps 3 - 5 of “To check” procedure (with the power switch turned off), and turn the handwheel Setscrew toward you to raise the needle. Hexagonal socket bolt 2. Remove the top cover and face plate. Buttonhole lever 3.

  • Page 34: Thread Take-Up Lever Phase

    Thread take-up lever phase Insert the needle bar crank pin into the take-up lever crank as illustrated. The setscrew A (long) must hold the needle bar crank pin cut surface. Thread take-up lever Setscrew A (long) Take-up lever crank Needle bar crank pin cut surface...

  • Page 35: Lower Shaft

    Lower shaft To attach the lower shaft parts The phases for (A) and (B) are the same as that of the spring pin (C). The phase of (D) is shown below. Spring pin 3x18 Feed cam Thread drawing Lower shaft gear lever cam Feed lifting cam Feed lifting pin (D)

  • Page 36: Timing Belt

    Timing belt Attach the timing belt when the alignment mark (A) on the Alignment mark (A) belt wheel and the alignment mark (B) on the lower shaft 10 degrees gear are positioned as illustrated. Belt wheel Alignment mark (B) Spring pin Lower shaft gear...

  • Page 37: To Replace Driving Motor

    To replace driving motor To remove: 1. Remove the top cover, face plate, front cover and belt cover. 2. Remove the motor belt. 3. Disconnect the motor connector from the printed circuit board A. 4. Remove the setscrews (2 pcs.) and replace the motor.

  • Page 38: Upper Shaft Shield Plate Position

    Upper shaft shield plate position When the machine is set for zigzag stitch, the needle should start to swing 7.2 - 8.2 mm above the surface of the needle plate. 1. Attach the #14 needle. 2 Turn the power switch on while pressing the auto- lock key and needle up/doun key to enter the factory Needle #14 setting mode.

  • Page 39: Adjusting Buttonhole Lever Position

    Adjusting buttonhole lever position Auto-lock key 1. Turn the power switch on while pressing the auto- (Factory setting mode) Needle up/down key lock key and needle up/doun key to enter the factory setting mode. 2. Press the numeral key “4” to select the upper shaft positioning sensor adjusting mode.

  • Page 40: Stretch Stitch Feed Balance

    Stretch stitch feed balance When the stretch pattern "8" is sewn 8 times with the stretch stitch balancing dial at the standard setting mark, the length of five of stretch patterns should be in the range of 33 to 39 mm. Auto-lock key (Factory setting mode) 1.

  • Page 41: Adjustment Of Presser Bar Lifter Switch Position

    Adjustment of presser bar lifter switch position Auto-lock key To check: (Factory setting mode) 1. Attach the zigzag foot A. Needle up/down key 2. Lower the presser foot lifter. 3. Turn the power switch on while pressing the auto- lock key and needle up/doun key to enter the factory setting mode.

  • Page 42: Needle Plate Sensor Switch

    Needle plate sensor switch To change: To remove: 1. Remove the base. 2. Remove the front cover. Rear side 3. Disconnect the needle plate sensor switch connector from the printed circuit board A. 4. Remove the setscrews A (2 pcs) and remove the Needle plate sensor switch needle plate sensor setting plate.

  • Page 43: Switching Power Supply

    Switching power supply To remove: 1. Remove the power supply cover and belt cover. 2. Disconnect the connector for power supply from the switching power supply. Connector for power supply 3. Disconnect the connector for foot control (connected to the switching power supply) from the printed circuit board A.

  • Page 44: Drop Feed Micro Switch

    Drop feed micro switch To change: To remove: 1. Remove the front cover and base. (View from the belt cover side) Drop feed micro switch 2. Disconnect the connector for drop feed micro switch from the printed circuit board A. 3.

  • Page 45: When The Feed Dog Does Not Return To "Up" Position

    When the feed dog does not return to “UP” position Projection of feed lifting cam 1. Function of the drop feed lever 1) Remove the base. 2) Bring 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.

  • Page 46: Self Diagnosis

    Self diagnosis NOTE: 1. The power switch must be turned off when replacing parts. 2. The language on the LCD is English only. Preparation: 1.Shift the bobbin winder stopper to the right. 2. Slide the drop feed lever to the left to raise the feed dog. 3.
  • Page 47 1. Function of buzzer, LCD and LED Correct condition Faulty condition 1. Buzzer sounds Buzzer does not sound.   2. LCD and LED blink at 1 second The step 1 screen does not appear. interval. LED of the start/stop key does not 3.
  • Page 48 Detecting switch Correct condition Faulty condition 1. Bobbin winder switch (Spool) Buzzer does not sound. Move the bobbin winder stopper The display does not change or is to the left and right. reversed. Left: “H” Right: “L” To adjust or replace a part: Adjust the position of the 2.
  • Page 49 Foot control/speed control slider 1. Foot control Correct condition Faulty condition When the foot control is not The number is less than 240. connected: 240 or more The screen does not change. The number changes when the foot control is connected/pressed and To replace: released.
  • Page 50 7. Thread cutter motor Correct condition Faulty condition Turn the handwheel to move the The thread cutter motor is not needle bar to the zigzag phase (up initialized. position). When pressing the needle “E4” is indicated. up/down key, the thread cutter The caution buzzer sounds when motor is initialized and the buzzer the thread cutting motor starts...

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