JANOME MC400E User manual

Brand: JANOME

Model: MC400E

Category: Sewing machines

Type: User manual

This manual is also suitable for

JANOME MC400E is a computerized sewing machine with a wide range of features and capabilities that make it a great choice for both beginners and experienced sewers.

Some of the key features of the JANOME MC400E include:

40 built-in stitches, including utility, decorative, and heirloom stitches
Automatic needle threader
Drop feed for free-motion quilting
Variable stitch length and width
Built-in thread cutter
LCD screen for easy operation
Hard case for storage and transportation

With its wide range of features and capabilities, the JANOME MC400E is a versatile sewing machine that can be used for a variety of projects, from simple repairs to complex garments. It is also a great choice for quilters, as it has a number of features that make quilting easier and more enjoyable.

JANOME MC400E is a computerized sewing machine with a wide range of features and capabilities that make it a great choice for both beginners and experienced sewers.

Some of the key features of the JANOME MC400E include:

40 built-in stitches, including utility, decorative, and heirloom stitches
Automatic needle threader
Drop feed for free-motion quilting
Variable stitch length and width
Built-in thread cutter
LCD screen for easy operation
Hard case for storage and transportation

SERVICE MANUAL

MODEL: MC400E

First Edition: 29 February 2016

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.................................................................................11

Upper shaft shield position ................................................................................................................................ 12-13

Needle thread tension .............................................................................................................................................14

Tension release mechanism ....................................................................................................................................15

Height of the embroidery foot ..................................................................................................................................17

Presser foot lifter detecting switch ...........................................................................................................................20

Automatic thread cutter ...........................................................................................................................................21

Remaining bobbin thread sensor.............................................................................................................................22

Hoop position...........................................................................................................................................................23

X-sensor position .....................................................................................................................................................25

Y-sensor position .....................................................................................................................................................26

Y-carriage supporter ................................................................................................................................................27

DC Motor belt deection ..........................................................................................................................................29

Replacement

Needle threader .......................................................................................................................................................16

Printed circuit board A..............................................................................................................................................18

Printed circuit board F .............................................................................................................................................19

Carriage unit ............................................................................................................................................................24

Switching power supply ...........................................................................................................................................28

Driving motor ...........................................................................................................................................................29

Replacing the Gear of the X-carriage ......................................................................................................................30

Oiling

Needle bar, presser bar and thread take-up lever ...................................................................................................31

Oil wick ....................................................................................................................................................................32

Lower shaft supporter (front and rear) .....................................................................................................................32

Y-carriage ................................................................................................................................................................33

X-carriage ................................................................................................................................................................33

PARTS LIST

...................................................................................................................................................... 34-51

MC450e

Replacing External Parts (1) Face Cover and Thread Cutter Cover

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

Setscrew

Replacing the thread cutter cover

To remove:

1. Remove the cap and setscrew (A).

Stand the machine so the handwheel side comes to

the underside of the machine.

Insert the screwdriver from the bottom hole of the

thread cutter cover.

Loosen the setscrew (B).

Remove the thread cutter cover.

To attach:

2. Follow the above procedure in reverse.

Cap

Setscrew (A)

Thread cutter cover

Setscrew (B)

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.

2. Remove the 6 setscrews (A) and remove the bottom

plate.

Setscrews (A

Setscrews (A)

Bottom plate

To attach:

3. Follow the above procedure in reverse.

MC450e

Setscrew (A) Setscrew (A)

Needle plate

Bed cover

Rear cover Hook

Hook

Rear cover

Bed cover

Replacing External Parts (3) Bed Cover

Replacing the bed cover

To remove:

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).

3. Remove the bed cover while pushing the rear cover

to unlock the hooks.

To attach:

4. Follow the above procedure in reverse.

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 rst page of

the design list of Petite Designs will open.

Press the embroidery pattern #1 w to move the

carriage to the starting position, then turn the power

switch off.

Setscrew (A)

2. Loosen the setscrew (A).

Setscrews (B)

3. Remove the 2 setscrews (B) near the spool pin.

4. Remove the cap and setscrew (C).

Remove the belt cover.

Setscrews (C)

5. Remove all the connectors from the pointed circuit

board A and unlock the hooks, then remove the front

cover.

To attach:

6. Follow the above procedure in reverse.

NOTE:

Refer to page 18 to locate the connectors.

Belt cover

MC450e

Replacing External Parts (5) Rear Cover

Replacing the rear cover

To remove:

1. Remove the face cover, base plate and bed cover.

2. Remove the setscrew (A).

Setscrew (A)Rear cover

Setscrews (B)

Setscrews (C)

Setscrews (D)

Setscrew (E)

Setscrew (F)

3. Remove the 2 setscrews (B) and 3 setscrews (C).

Y-carriage

supporter

4. Remove the 2 setscrews (D).

5. Loosen the setscrew (E).

6. Loosen the setscrew (F), and shift the Y-carriage

supporter up.

7. Unlock the hooks, raise the carrying handle and

remove the rear cover by opening the left end of the

covers.

To attach:

8. Follow the above procedure in reverse.

NOTE:

Adjust the Y-carriage supporter (refer to page 27).

MC450e

Replacing External Parts (5) Carriage Cover and Belt Cover

Replacing the Carriage Cover

To remove:

1. Remove the setscrew (A).

Setscrew (A)

Setscrew (B)

2. Remove the setscrew (B).

Remove the carriage cover.

To remove:

3. Follow the above procedure in reverse.

Setscrew (A)

Replacing the Belt Cover

To remove:

1. Remove the cap and setscrew (A).

2. Remove the belt cover.

To remove:

3. Follow the above procedure in reverse.

Belt cover

MC450e

Adjusting the Needle Drop Position

1. Lower the needle to the lowest position by turning the

handwheel.

2. Remove the face cover (refer to page 1).

3. Loosen the 2 setscrews (A).

4. Move the needle bar supporter back or forth to adjust

the position of the needle.

5. Loosen the setscrew (B).

6. Move the needle drop adjusting plate laterally to

adjust the position of the needle.

7. Tighten the setscrews.

8. Attach the face cover.

NOTE:

Check the hook timing (refer to page 8) and clearance

between the needle and hook (refer to page 10). Adjust

them if necessary.

The needle should be positioned at the center of the needle plate hole.

Setscrew (B)

Needle bar

supporter

Setscrews (A)

MC450e

Adjusting the Hook Timing

1. Remove the needle plate and bottom plate (refer to

page 2).

2. Remove the presser foot and the bobbin holder.

Attach a #11 blue tip needle.

3. Lower the needle bar to its lowest position by turning

the hand wheel toward you.

4. Raise the needle bar 3.25 to 3.55 mm up from the

lowest position.

5. Loosen the setscrews on the lower shaft gear.

Turn the lower shaft gear until the tip of the rotary

hook meets the right side of the needle, while holding

the hand wheel so the needle bar does not move.

6. Tighten the setscrews.

7. Attach the bobbin holder, needle plate and presser

foot. Replace the needle with the #11 needle.

8. Attach the bottom plate and needle plate.

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.

Needle plate

Bobbin holder

Tip of the rotary hook

#11 needle

3.25 to 3.55 mm

Lowest position

Setscrew

SetscrewLower shaft gear

MC450e

Adjusting the Needle Bar Height

1. Remove the face cover (refer to page 1).

2. Remove the presser foot, needle plate and bobbin

holder. Attach a #11 needle.

3. Turn the hand wheel to raise the needle bar from the

lowest position until the tip of the rotary hook meets

the right side of the needle.

4. Loosen the setscrew on the needle bar supporter.

Move the needle bar up or down to set the distance

between the top of the needle eye and the upper

surface of the rotary hook at 1.6 to 2.0 mm.

5. Tighten the setscrews. Be sure that the groove of the

needle is facing right in the front.

6. Attach the bobbin holder, needle plate and presser

foot. Replace the needle with the #11 needle.

7. Attach the face cover.

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.

1.6 to 2.0 mm

Upper surface of the hook race

Top of the needle eye

Rotary hook

Setscrew

Needle bar

Needle plate

Bobbin holder

Tip of the rotary hook

#11 needle

Groove

MC450e

Adjusting the Clearance between Needle and Hook

1. Remove the base plate (refer to page 2).

2. Remove the presser foot, needle plate and bobbin

holder. Replace the needle (#11) with the test pin.

3. Loosen the setscrews (A), (B) and (C) and tighten the

setscrew (C) slightly.

4. Turn the hand wheel to bring the tip of the rotary hook

behind the test pin.

Adjust the clearance between the test pin and the tip

of the rotary hook to -0.10 to +0.05 mm by moving the

rotary hook set plate up or down.

5. Tighten the setscrews (A), (B) and (C) rmly.

6. Check the backlash between the rotary hook gear and

lower shaft gear and adjust the backlash if necessary.

7. Attach the bobbin holder, needle plate and presser

foot. Replace the test pin with the #11 needle.

8. Attach the bed cover.

The clearance between the needle and the rotary hook should be -0.10 to +0.05 mm.

Test pin

Tip of rotary hook

-0.10 to +0.05 mm

Setscrew (A)

Setscrew (C)

Setscrew (B)

MC450e

Adjusting the Backlash between the Rotary Hook Gear and Lower Shaft Gear

1. Remove the bed cover (refer to page 3).

2. Remove the needle, presser foot, needle plate and

bobbin holder.

3. Loosen the setscrew.

Check the rotary play of the hook.

4. Turn the lower shaft bushing (eccentric) in the

direction “A” if the gears do not turn smoothly.

Turn the lower shaft bushing in the direction “B” if the

rotary play is larger than 0.8 mm.

5. Tighten the setscrew.

6. Attach the bobbin holder, needle plate, presser foot

and needle.

7. Attach the bed cover.

The rotary play of the hook should be 0. 8 mm or less.

Setscrew

Lower shaft bushing

Rotary play should be

0.8 mm or less.

MC450e

Printed circuit board L2

Adjusting the Upper Shaft Shield Position

1. Remove the face cover, bed cover and front cover (refer

to pages 1,3 and 4). Attach the needle plate.

2. Remove the setscrews (A) and printed circuit board F

from the front cover.

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”.

Setscrews (B)

Setscrews (A)

Front cover

Printed circuit board F

3. After disconnecting all of the connector, remove the

setscrews (B) to remove the printed circuit board A

from the front cover.

4. Reconnect the connectors to the printed circuit board

A except printed circuit board L2 and L3 connectors.

* The carriage will not return to the home position after

turning the power switch on if the X-motor connector

is disconnected.

(To be continued to the next page.)

X motor connector

Printed circuit

board L3

Phase key

To adjust:

To check:

1. Attach the needle #11.

Turn the power switch on while pressing the Start/

stop button to enter the factory setting mode.

Press “Phase” key.

2. Turn the handwheel toward you slowly until the

needle from its lowest position until “Bight” changes

from “L” to “H”.

3. The needle height should be 8.2 to 9.2 mm above

from the surface of the needle plate. If not, adjust the

upper shield position.

8.2–9.2 mm

#11 Blue needle

Start/stop button

MC450e

6. Turn the handwheel toward you and raise the needle

8.7 mm above the surface of the needle.

8.2–9.2 mm

#11 Blue needle

5. Turn the power switch on while pressing the Start/

stop button to enter the factory setting mode.

Press “Phase” key.

Phase key

Setscrew (C)

Even

Sensor

Upper shaft shield plate

Fig. 1

Bight sensor

Upper shaft shield plate

Bight shield plate

Start/stop button

Printed circuit board F

7. Loosen the setscrew (C) of the upper shaft shield

plate. Turn the upper shaft shield until “Bight”

changes L to H.

Tighten the setscrew (C).

* The position of the upper shaft shield plate should be

in the center of the upper shaft sensor (see Fig. 1.)

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).

To check:

1. Lower the presser foot.

2. Turn the power switch ON while pressing the start/

stop button.

Press “Foot Sensor/Tension” key.

3. Press “Free” key.

The tension disc will be opened with the presser foot

lowered.

4. Thread white polyester thread (size 50) to the

machine.

5. Press “3.4” key.

The tension discs will be closed and the thread

tension will be set at “3.4”.

6. The upper thread tension should be 59 to 67 grams

when pulling the thread at the speed of 110 mm/sec.

If not, adjust the needle thread tension.

Foot Sensor/Tension key

Start/stop button

Pulling direction

(Pulling speed 110 mm/sec.)

Free key

3.4 key

To adjust:

1. Lower the presser foot.

2. Turn the power switch ON while pressing the start/

stop button.

Press “Foot Sensor/Tension” key.

3. Press “Free” key.

The tension disc will be opened with the presser foot

lowered.

4. Thread white polyester thread (size 50) to the

machine.

5. Press “3.4” key.

6. Remove the face cover (refer to page 1).

Adjust the tension by turning the thread tension

adjusting screw.

To loosen the tension, turn it clockwise (in the

direction of “–”).

To tighten the tension, turn it counterclockwise (in the

direction of “+”).

Thread tension

adjusting screw

–

MC450e

Thread tension release

adjusting plate

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.

1. Remove the front cover (refer to page 4).

2. Turn the power switch ON while pressing the start/stop

button.

Press “Foot Sensor/Tension” key.

3. Press “Free” key.

The tension disc will be opened with the presser foot

lowered.

Lower the presser foot.

4. Turn the thread tension gear until the convex part of

tension gear is not set at the tension release claw.

5. Loosen the setscrews (A) and (B).

6. Adjust the clearance between the tension release

adjusting plate and the tension disc supporter to 0.2

mm - 0.8 mm as shown in Fig. B.

  Tightenthesetscrew(A)rst,andadjustthethread

tensionreleaseadjustingplateposition,thentighten

the setscrew (B).

Be sure that the tension release lever touches to the

presser foot lifter as shown in Fig. C when tightening

the setscrew (B).

7. Turn the thread tension gear until the convex part

of tension gear is engaged with the tension release

claw. Be sure that the tension release adjusting plate

touches to the tension disc supporter and the tension

discs are opened slightly (see Fig. D and E).

Convex is NOT set at release claw

Thread tension gear

Convex part of

tension gear

Setscrew (A)

Thread tension

release adjusting

plate

Tension

release

claw

Setscrew (B)

Foot Sensor/Tension key Free key

0.2−0.8mm

Tension release lever

Presser foot lifter

The tension release

lever touches to the

presser foot lifter.

Fig. B

Fig. A

Fig. C

Convex is set at release claw

Convex part of

tension gear

Tension

release

claw

Tension disc supporter

Thread tension release

adjusting plate

Tension disc

(closed)

Tension

disc

(opened)

Fig. D

Fig. E

MC450e

Replacing and Adjusting the Needle Threader

If the hook of the needle threader is damaged, replace the threader plate as follows.

Threader plate supporter (A)

Pin (B)

Hook

Groove

To remove:

1 Push down the needle threader knob and pull the

needle threader plate (A) down to remove it (see Fig. A).

To attach:

1. To install 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) and

adjust the hook position (Fig. B).

View A

Hook

Setscrew (C)

Threader plate

Fig. A

Fig. B

Needle bar

Setscrew (D)

Threader position set plate

Fig. C

Needle threader lever

2. If the hook on the threader plate touches the top or

bottom side of the needle eye, loosen setscrew (D)

and adjust the hook position (Fig. C).

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).

2. Lower the presser foot.

Turn the handwheel toward you to lower the

embroidery foot at its lowest position.

3. Loosen the setscrew (A) on the presser bar

supporter.

4. Place the 1.2 mm spacer (block) between the presser

foot and the needle plate.

5. Fix the presser bar link by tightening the setscrew

with holding the presser foot actuator arm against the

cam.

6. Check “Presser Foot Lifter Detecting Switch” (refer to

page 20).

Setscrew (A)

Presser

foot bar

supporter

1.2 mm

Surface of

needle plate

Embroidery foot

Presser foot actuator arm Cam

MC450e

Replacing the Printed Circuit Board A

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.

4. Remove the 4 setscrews (B) and remove the printed

circuit board A from the case.

To attach:

1. Follow the above procedure in reverse.

NOTE:

Refer to the following diagram when connecting the

connectors.

Setscrews (B)

Setscrews (A)

Setscrew (B)

Printed circuit

board A

Case

Disconnecting LCD Module Flexible PCB

Flexible PCB

Lift up the clamp to unlock.

Close the clamp to lock.

Touch panel (Black)

Program (slave)(Black)

Printed circuit

board L1(Black)

Printed circuit board L2 (White)

Printed circuit

board L3(Red)

Printed circuit board F(Black)

Presser foot lifter sensor(Black)

Thread detection sensor (White)

Switching power supply (White)

Thread cutter motor (White)

Switching power supply (White)

Y-motor

Bobbin thread

detecting sensor (Green)

Bobbin thread winding

Program (master)

Phase sensor

USB

X-motor

Thread tension motor

DC motor

Printed circuit board A connection

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JANOME MC400E User manual

Brand: JANOME

Model: MC400E

Category: Sewing machines

Type: User manual

This manual is also suitable for

JANOME MC400E is a computerized sewing machine with a wide range of features and capabilities that make it a great choice for both beginners and experienced sewers.

Some of the key features of the JANOME MC400E include: