Janome MC400E Service Manual
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Janome MC400E Service Manual

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SERVICE MANUAL
MODEL: MC400E

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Summary of Contents for Janome MC400E

  • Page 1 SERVICE MANUAL MODEL: MC400E...

  • Page 2: Table Of Contents

    INDEX Replacing External Parts Face cover .................................1 Thread cutter cover ..............................1 Base plate..................................2 Bed cover ..................................3 Front cover ................................4 Rear cover .................................5 Carriage cover ................................6 Belt cover...................................6 Mechanical Adjustment Needle drop position..............................7 Hook timing................................8 Needle bar height ..............................9 Clearance between the needle and hook ........................10 Backlash between the rotary hook gear and lower shaft gear.................

  • Page 3: Replacing External Parts

    MC450e Replacing External Parts (1) Face Cover and Thread Cutter Cover Setscrew Replacing the face cover To remove: 1. Remove the setscrew and remove the face cover. To attach: 2. Follow the above procedure in reverse. Face cover Replacing the thread cutter cover To remove: 1.

  • Page 4: Base Plate

    MC450e Replacing External Parts (2) Base Plate Replacing the base plate To remove: 1. Stand the machine so that the handwheel side comes to the underside of the machine. Bottom plate 2. Remove the 6 setscrews (A) and remove the bottom plate.

  • Page 5: Bed Cover

    MC450e Replacing External Parts (3) Bed Cover Replacing the bed cover To remove: Setscrew (A) Setscrew (A) 1. Turn the power switch on to move the carriage to the stored position, then turn the power switch off. 2. Remove the setscrews (A) and the needle plate. Remove the base plate (refer to page 2).

  • Page 6: Front Cover

    MC450e Replacing External Parts (4) Front Cover Replacing the front cover To remove: 1. Remove the face cover and bed cover (refer to pages 1 and 3.). Turn the power switch on. Press the built-in design key q and the first page of the design list of Petite Designs will open.

  • Page 7: Rear Cover

    MC450e Replacing External Parts (5) Rear Cover Rear cover Setscrew (A) Replacing the rear cover To remove: 1. Remove the face cover, base plate and bed cover. 2. Remove the setscrew (A). Setscrews (B) 3. Remove the 2 setscrews (B) and 3 setscrews (C). Setscrews (C) 4.

  • Page 8: Carriage Cover

    MC450e Replacing External Parts (5) Carriage Cover and Belt Cover Replacing the Carriage Cover To remove: 1. Remove the setscrew (A). Setscrew (A) 2. Remove the setscrew (B). Remove the carriage cover. To remove: 3. Follow the above procedure in reverse. Setscrew (B) Replacing the Belt Cover Belt cover...

  • Page 9: Adjusting The Needle Drop Position

    MC450e Adjusting the Needle Drop Position The needle should be positioned at the center of the needle plate hole. Setscrews (A) 1. Lower the needle to the lowest position by turning the handwheel. 2. Remove the face cover (refer to page 1). 3.

  • Page 10: Hook Timing

    MC450e Adjusting the Hook Timing The hook timing is an amount of ascending travel of the needle bar from its lowest position to where the tip of the rotary hook meets the right side of the needle that should be 3.25 to 3.55 mm. 1.

  • Page 11: Needle Bar Height

    MC450e Adjusting the Needle Bar Height The distance between the top of the needle eye and the upper surface of the hook race should be 1.6 to 2.0 mm when the tip of the rotary hook meets the right side of the needle in the ascending travel form the lowest position.

  • Page 12: Clearance Between The Needle And Hook

    MC450e Adjusting the Clearance between Needle and Hook The clearance between the needle and the rotary hook should be -0.10 to +0.05 mm. 1. Remove the base plate (refer to page 2). 2. Remove the presser foot, needle plate and bobbin holder.

  • Page 13: Backlash Between The Rotary Hook Gear And Lower Shaft Gear

    MC450e Adjusting the Backlash between the Rotary Hook Gear and Lower Shaft Gear The rotary play of the hook should be 0. 8 mm or less. 1. Remove the bed cover (refer to page 3). 2. Remove the needle, presser foot, needle plate and bobbin holder.

  • Page 14: Upper Shaft Shield Position

    MC450e Adjusting the Upper Shaft Shield Position The needle height should be at 8.2-9.2 mm above the needle plate surface when the “Bight” phase changes from “L” to “H”. To check: 1. Attach the needle #11. Turn the power switch on while pressing the Start/ stop button to enter the factory setting mode.
  • Page 15 MC450e 5. Turn the power switch on while pressing the Start/ stop button to enter the factory setting mode. Start/stop button Press “Phase” key. Printed circuit board F Phase key 6. Turn the handwheel toward you and raise the needle 8.7 mm above the surface of the needle.

  • Page 16: Needle Thread Tension

    MC450e Adjusting the Needle Thread Tension The standard upper thread tension should be 59 to 67 gram-force when pulling the thread (white polyester thread size 50) at the speed of 110 mm/sec with the tension at “3.4” (Be sure the presser foot is lowered).

  • Page 17: Tension Release Mechanism

    MC450e Adjusting the Tension Release Mechanism When the presser foot is lowered, the thread tension will be closed and pull the thread. When the thread tension will be released, the tension disc will be opened and release the thread correctly. Convex is NOT set at release claw 1.

  • Page 18: Replacement Needle Threader

    MC450e Replacing and Adjusting the Needle Threader If the hook of the needle threader is damaged, replace the threader plate as follows. To remove: 1 Push down the needle threader knob and pull the needle threader plate (A) down to remove it (see Fig. A). Pin (B) To attach: 1.

  • Page 19: Height Of The Embroidery Foot

    MC450e Adjusting the Height of the Embroidery Foot Space between the needle plate and bottom of the embroidery foot should be 0.9 to 1.5 mm when the presser bar is at its lowest position. 1. Remove the face cover (refer to page 1). Presser foot bar 2.

  • Page 20: Printed Circuit Board A

    MC450e Replacing the Printed Circuit Board A Setscrews (B) To remove: 1. Remove the face cover, bed cover and front cover (refer to pages 1, 3 and 4). 2. Disconnect all the connectors from the printed circuit board A. 3. Remove the 3 setscrews (A) and remove the printed circuit board A with the case.

  • Page 21: Printed Circuit Board F

    MC450e Replacing the Printed Circuit Board F To remove: Front cover 1. Remove the face cover, bed cover and front cover (refer to pages 1, 3 and 4). Setscrews (A) 2. Disconnect the connectors for printed circuit board F from the printed circuit board A. 3.

  • Page 22: Presser Foot Lifter Detecting Switch

    MC450e Presser Foot Lifter Detecting Switch Adjustment To adjust: 1. Remove the front and rear cover (refer to pages 4 and Foot Sensor/Tension key Free key 2. Turn the power switch ON while pressing the Start/ Stop button to enter the factory setting mode. Press “Foot Sensor /Tension”...

  • Page 23: Automatic Thread Cutter

    MC450e Automatic Thread Cutter Adjustment The distance between the end of thread cutter plate slit and the edge of moving cutter should be in the range of 0.8 to 1.6 mm. To check: End of thread cutter plate slit 1. Remove the front and rear cover (refer to pages 4 and Edge of moving cutter Moving cutter 0.8 to 1.6 mm...

  • Page 24: Remaining Bobbin Thread Sensor

    MC450e Remaining Bobbin Thread Sensor Adjustment Bobbin key Adjustment 1. Prepare the empty bobbin (diameter: 8.4 mm) and the gauge bobbins (diameter: 12.5 mm and diameter: 18.9 mm). 2. Remove the presser foot and needle plate. 3. Turn the power switch ON while pressing the Start/ Stop button to enter the factory setting mode.

  • Page 25: Hoop Position

    MC450e Hoop Adjustment Hoop Adjust key Adjustment 1. Remove the presser foot. 2. Turn the power switch OFF. Attach the embroidery hoop and the template. 3. Turn the power switch ON while pressing the Start/ Stop button to enter the factory setting mode. 4.

  • Page 26: Carriage Unit

    MC450e Replacing the Carriage Unit To remove: Setscrew (A) 1. Remove the face cover, bed cover and front cover (refer to pages 1, 3 and 4). 2. Remove the setscrews (A), (B) and the carriage cover. 3. Remove the setscrews (C), (D), (E) and (F). Remove the cord binders as necessary.

  • Page 27: X-Sensor Position

    MC450e X-sensor Position Adjustment The gap between the stopper and X-carriage guide should be 7 mm. Adjustment SM Init key 1. Remove the face cover, bed cover and front cover (refer to pages 1, 3 and 4). 2. Remove the printed circuit board F from the front cover.

  • Page 28: Y-Sensor Position

    MC450e Y-sensor Position Adjustment The gap between the hoop attaching base and Y-shaft fixing plate should be 7 mm. SM Init key Adjustment 1. Remove the face cover, bed cover and front cover (refer to pages 1, 3 and 4). 2.

  • Page 29: Y-Carriage Supporter

    MC450e Adjusting the Y-carriage Supporter The distance between the top of the rail and the lower edge of Y-carriage should be in the range of 14 to 14.6 mm. Adjustment Lower edge of Y-carriage 1. Remove the carriage cover (refer to page 6). Y-carriage supporter 2.

  • Page 30: Switching Power Supply

    MC450e Replacing the Switching Power Supply To remove: 1. Remove the face cover, bottom plate, bed cover Setscrew (A) and rear cover (refer to pages 1, 2, 3 and 4). 2. Remove the connector from the switching power supply. Connector 3.

  • Page 31: Dc Motor Belt Deflection

    MC450e Replacing Driving Motor To remove: 1. Remove the face cover, base plate, front cover and rear cover from the machine (refer to pages 1, 2, 3 and Be sure that the DC motor connector is removed from the printed circuit board A. Motor belt Cord guide plate DC motor...

  • Page 32: Replacing The Gear Of The X-Carriage

    MC450e Replacing the Gear of the X-carriage Remove the setscrews (A). Gear set plate Pulling down the gear set plate and the gear (A), remove Gear (C) Setscrews (A) them. Set a new gear (A) on the gear set plate. Attach the gear set plate with the new gear (A) on the X-carriage and temporarily tighten the setscrews (A).

  • Page 33: Needle Bar, Presser Bar And Thread Take-Up Lever

    MC450e Oiling the Machine (1) Move the carriage to the home position and turn off the power switch and/or unplug the machine before oiling the machine. • Wait until the motor cools down before oiling. • Do not oil any parts other than as explained in this section. •...

  • Page 34: Oil Wick

    MC450e Oiling the Machine (2) Oil the wick Slide the cover on the top rear side of the machine. Oil the oil wick inside of the machine. Oil wick Cover Oil the lower shaft supporter (front) Remove the thread cutter cover (refer to page 1). Oil the arrow point as indicated.

  • Page 35: Y-Carriage

    MC450e Oiling the Machine (3) Oil the Y-carriage Remove the carriage cover (refer to page 6). Oil the arrow points as indicated in the illustration. Oil the X-carriage Oil the arrow point (felt) inside of the carriage slit.

This manual is also suitable for:

Mc500eMc450eMc550e

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