Janome JEM GOLD 660 User manual

SERVICINGMANUAL
JEMGOLD(660)

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CONTENTS
SERVICE ACCESS
FACE COVER.........................................................................................................2
BED COVER...........................................................................................................3
FRONT COVER ......................................................................................................4
REAR COVER ........................................................................................................5
MECHANICAL ADJUSTMENT
THREADTENSION .................................................................................................6
PRESSER BAR HEIGHT AND ALIGNMENT ...........................................................7
DISTRIBUTIONOFNEEDLE SWING ......................................................................8
NEEDLE DROP ......................................................................................................9
NEEDLE BAR HEIGHT .........................................................................................10
HOOKTIMING .........................................................................................................1]
NEEDLE CLEARANCE TO HOOK .......................................................................12
BACKLASH (LOWER SHAFT GEAR)...................................................................13
FEED DOG HEIGHT .............................................................................................14
STRETCH STITCH BALANCE ..............................................................................15
BUTTONHOLE STITCH BALANCE .......................................................................16
ADJUSTING THE LINE TACK WIDTH AND
DISENGAGEMENT CLEARANCE OF CAM FOLLOWER............................17
WIRINGOF TERMINAL BLOCK ............................................................................18

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SERVICE ACCESS
FACE COVER
(Toremove)
1. Remove the screw and remove the face cover as shown below.
(Toattach)
2. Follow the above procedure in reverse.

3
SERVICE ACCESS
BED COVER
(Toremove)
1. Loosen the 5 screws and remove the bed cover.
(Toattach)
2. Follow the above procedure in reverse.

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SERVICE ACCESS
FRONT COVER
(Toremove)
1. Remove the face cover and bed cover (see pages 2, 3).
2. Pull out the pattern selector dial.
3. Remove the screw (A) and rubber cushion.
4. Loosen the screws (B), (C), (D) and remove the front cover.
(Toattach)
5. Follow the above procedure in reverse.

SERVICE ACCESS
REAR COVER
(Toremove)
1. Remove the face cover, bed cover and front cover (see pages 2, 3, 4).
2. Remove the screws (A), (B), (C), (D), (E) and rear cover.
(Toattach)
6. Follow the above procedure in reverse.
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MECHANICAL ADJUSTMENT
THREADTENSION
The standard upper thread tension should be 75 - 90 g when pulling the thread (white color
cotton thread #50) in the direction of the arrow with the tension dial set at 4. (Make sure
the presser foot is lowered.) If the tension is out of the standard range, adjust it as follows:
1. Remove the front cover (see page 4).
2. If the thread tension is too tight turn the adjusting dial in the direction of (A).
If the thread tension is too loose turn the adjusting dial in the direction of (B).
3. Check the thread tension and attach the front cover.

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MECHANICAL ADJUSTMENT
PRESSER BAR HEIGHT AND ALIGNMENT
The standard presser bar height is 6.0 mm between the bottom surface of the presser foot
and the needle plate when the presser bar lifter is in the up position.
1. Remove the face cover (see page 2).
2. Raise the presser foot and loosen the presser bar bracket screw and adjust the height
(6.0 mm).
3. Check to see if the presser foot is parallel to the openings of the feed dog on the
needle plate. If not, readjust it.
4. Tighten the presser bar bracket screw while holding the presser bar to keep the foot
parallel to the openings.
5. Attach the face cover.

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MECHANICAL ADJUSTMENT
DISTRIBUTIONOFNEEDLE SWING
If the timing of the needle swing is not correctly adjusted, the needle will move sidewise
while it is in the fabric. The needle should start to swing from a position 2-3 mm above the
needle plate in its right outflow.
1. Remove the front cover (see page 4).
2. Set the pattern selector dial to maximum zigzag width (stitch length dial at any
position).
3. Loosen the worm set screws (2 pcs.).
4. Hold the worm in place with a screwdriver or wrench and turn the hand wheel slightly.
a) If the needle starts swinging too soon, turn the hand wheel in the direction of A
(clockwise).
b) If the needle starts swinging too late, turn the hand wheel in the direction of B (counter-
clockwise).
5. Tighten the worm set screws (2 pcs.).
6. Reattachthe front cover.

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MECHANICAL ADJUSTMENT
NEEDLE DROP
When the pattern selector dial is set at “straight stitch”, the needle should be positioned at
the center of the needle plate hole.
When the pattern selector dial is set at “zigzag stitch”, in maximum zigzag width, the
clearance between the needle and the edge of the needle plate hole should be equal, 0.2
mm or more, at the left and right needle drop positions.
If not, make adjustment as follows:
1. Remove the face cover (see page 2).
2. Set the pattern selector dial at maximum zigzag width.
3. Turn the set screw to adjust the needle drop position.
4. Reattach the face cover.

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MECHANICAL ADJUSTMENT
NEEDLE BAR HEIGHT
With the pattern selector dial set at maximum zigzag width and when the point of the rotary
hook exactly meets the right side of the needle in ascending travel of the needle bar from
its lowest position, at the right needle drop position, the distance between the upper edge
of the needle eye and the race of the rotary hook should be 3.3 ± 0.3 mm.
1. Set the pattern selector dial at maximum zigzag width and the needle at right needle
drop position.
2. Remove the face cover (see page 2).
3. Remove the set screw of the needle plate and pull out the bobbin holder.
4. Turn the hand wheel toward you until the rotary hook point exactly meets the right side
of the needle at the right needle drop position.
5. Loosen the hexagonal socket screw of the needle bar connecting stud.
6. Move the needle bar to provide a distance of 3.3 ± 0.3 mm between the upper edge of
needle eye and the race of the rotary hook.
7. Tighten the hexagonal socket screw of the needle bar connecting stud.
8. Reattach the bobbin holder and needle plate.
Note: Before adjustment, be sure to check the hook timing.

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MECHANICAL ADJUSTMENT
HOOKTIMING
With the needle bar swung to the right at the maximum zigzag width, the amount of
ascending travel of the needle bar from its lower position to the position where the tip of the
rotary hook exactly meets the right side of the needle should be 1.7 ± 0.3 mm.
Note: Before the adjustment, be sure to check the needle bar height.
1. Set the pattern selector dial at maximum zigzag width and the needle at right needle
position.
2. Remove the bed cover. (see page 3)
3. Remove the set screw on the needle plate, and remove the needle plate and bobbin
holder,
4. Loosen the hexagonal screws on the lower shaft gear,
5. Turn the hand wheel toward you to raise up the needle bar 1.7±0.3 mm from its lowest
position with the needle swung to the right.
6. While holding the hand wheel by hand to prevent the needle bar from moving, turn the
lower shaft gear in the arrow direction until the tip of the rotary hook exactly meets the
right side of the needle.
7. Tighten the hexagonal screws on the lower shaft gear.
8. Attach the bobbin holder, needle plate and bed cover.

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MECHANICAL ADJUSTMENT
NEEDLE CLEARANCE TO HOOK
The clearance between needle and rotary hook should be -0.10 to + 0.05 mm. If not, make
an adjustment as follows:
1. Set the pattern selector dial at maximum zigzag stitch width.
2. Remove the setscrew on the needle plate, and detach the needle plate and bobbin
holder.
3. Remove the bed cover (see page 3).
4. Loosen screws (B) and (C) and tighten screw (A) temporarily.
5. Replace the needle with the test pin. Turn the hand wheel toward you slowly by hand
until the needle bar reaches its lowest position.
The clearance between the needle and the point of the rotary hook should be between
-0.10 and +0.05 mm.
6. Tighten set screws (A), (B) and (C).
7. Check the backlash play (see page 13).
8. Attach the bed cover, bobbin holder, needle plate and bed cover.
9. Remove the test pin.

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MECHANICAL ADJUSTMENT
BACKLASH (LOWER SHAFT GEAR)
The lower shaft backlash play should be less than 0.8 mm when the point of rotary hook
point is in a range between both outer feed dogs. If there is more than 0.8 mm between the
gears, adjust as follows:
1. Remove the bed cover (see page 3).
2. Loosen the hexagonal socket screw,
3. Turn the lower shaft bushing in the direction of B when the play at the point of the hook
is too large.
Turn the lower shaft bushing in the direction of A when the play at the point of the hook
is too small,
4. Tighten the hexagonal socket screw and attach the bed cover.
Note: After the backlash adjustment, check the hook timing and feed dog height
adjustment.

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MECHANICAL ADJUSTMENT
FEED DOG HEIGHT
Lower the presser foot and turn the hand wheel toward you until the needle bar comes to
the highest point of its travel.
In this condition, the height of the feed dog above the needle plate should be 0.75 to 0.85
mm if not, adjust as follows:
1. Set the stitch length dial at “4”, and lower the presser foot.
2. Turn the hand wheel toward you until the feed dog comes to its highest position.
3. Remove the bed cover (see page 3).
4. Loosen set screw (A) and nut.
5. Turn the adjusting screw so that the feed dog height is 0.75 to 0.85 mm above the
surface of the needle plate.
6. Tighten nut and screw (A).
7 Attach the bed cover.

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MECHANICAL ADJUSTMENT
STRETCH STITCH BALANCE
When a stretch stitch pattern ( ) is sewn with the feed balancing dial at the standard
setting mark “ “, the pattern should be formed as shown in the figure below, If not, (If there
is unbalance between forward feeding and reverse feeding) then make an adjustment as
follows:
1. Set the pattern selector dial at ( ).
2. Place a piece of paper under the presser foot and turn the hand wheel toward you to
check the forward (A) and backward (B) needle drop positions.
3. Remove the cap.
4. If the reverse stitch length (B) is shorter than the forward stitch length (A), turn the
adjusting screw in the direction of (C).
5. If the reverse stitch length (B) is longer than the forward stitch length (A), turn the
adjusting screw in the direction of (D).
6. Attach the cap.

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MECHANICAL ADJUSTMENT
BUTTONHOLE STITCH BALANCE
When sewing buttonholes, the stitches on each side of the buttonhole should have the
same stitch density, The range of 9 - 11 stitches in the right side row against 10 stitches in
the left side row is considered acceptable.
1. Sew a buttonhole and check both right and left row stitch densities.
2. Remove the cap.
3. If the left side row is denser than the right side row (A), turn the adjusting screw
counter-clockwise (in the direction of C).
If the right side row is denser than the left side row (B), turn the adjusting screw
clockwise (in the direction of D).
3. Attach the cap.

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ADJUSTING THE LINE TACK WIDTH AND
DISENGAGEMENT CLEARANCE OF CAM FOLLOWER
For the line tack width on buttonhole sewing, both right and left stitch widths should be
even. In an uneven setting, the zigzag width claw will touch the cam when the pattern
selector is turned.
1. Remove the front cover (see page 4).
2. Adjust the line tack by turning the adjusting screw.
(Adjust the left side of the line tack to make it even with the right side tack.)
3. Attach the front cover.

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