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Janome
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MC450e
Service Manual
35 pgs17.94 Mb0

Janome MC400E, MC500e, MC450e, MC550E Service Manual

SERVICE MANUAL
MODEL: MC400E
INDEX
Replacing External Parts
Mechanical Adjustment
Needle bar height ......................................................................................................................................................9
Backlash between the rotary hook gear and lower shaft gear.................................................................................11
Replacement
Driving motor ...........................................................................................................................................................29
Oiling
PARTS LIST
...................................................................................................................................................... 34-51
1
MC450e
Replacing External Parts (1) Face Cover and Thread Cutter Cover
Replacing the face cover
To r e m ove:
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 r e m ove:
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)
2
MC450e
Replacing External Parts (2) Base Plate
Replacing the base plate
To r e m ove:
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.
3
MC450e
Setscrew (A) Setscrew (A)
Needle plate
Bed cover
Rear cover Hook
Hook
Hook
Rear cover
Bed cover
Replacing External Parts (3) Bed Cover
Replacing the bed cover
To r e m ove:
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.
4
MC450e
Replacing External Parts (4) Front Cover
Replacing the front cover
To r e m ove:
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)
q
w
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
5
MC450e
Replacing External Parts (5) Rear Cover
Replacing the rear cover
To r e m ove:
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).
6
MC450e
Replacing External Parts (5) Carriage Cover and Belt Cover
Replacing the Carriage Cover
To r e m ove:
1. Remove the setscrew (A).
Setscrew (A)
Setscrew (B)
2. Remove the setscrew (B). Remove the carriage cover.
To r e m ove:
3. Follow the above procedure in reverse.
Setscrew (A)
Replacing the Belt Cover
To r e m ove:
1. Remove the cap and setscrew (A).
2. Remove the belt cover.
To r e m ove:
3. Follow the above procedure in reverse.
Belt cover
7
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)
8
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
9
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
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