Janome Memory Craft 3500 User manual

SERVICINGMANUAL
MEMORYCRAFT3500

CONTENTS
TOP COVER & FACE PLATE ATTACHING AND REMOVING........................................... 1
BASE & BED COVER ATTACHING AND REMOVING ...................................................... 2
BELT COVER ATTACHING AND REMOVING.................................................................... 3
FRONT PANEL ATTACHING AND REMOVING.................................................................. 4
TO ADJUST THE PRESSER BAR HEIGHT ...................................................................... 5
TO ADJUST THE NEEDLE DROP.................................................................................... 6
TO ADJUST THE NEEDLE BAR HEIGHT ......................................................................... 7
TO ADJUST THE HOOK TIMING....................................................................................... 8
TO ADJUST THE CLEARANCE BETWEEN THE NEEDLE AND THE HOOK................. 9
TO ADJUST THE BACKLASH OF HOOK DRIVE GEAR AND LOWER SHAFT GEAR . 10
TO ADJUST THE FEED DOG HEIGHT............................................................................11
TO ADJUST THE UPPER SHIELD PLATE POSITION.................................................... 12
TO ADJUST THE UPPER THREAD TENSION ............................................................... 13
TO ADJUST THE STRETCH FEED BALANCE............................................................... 14
TO REPLACE AND ADJUST THE THREADER PLATE.................................................. 15
TO ADJUST THE BUTTONHOLE LEVER....................................................................... 16
BOARD A ATTACHING AND REMOVING ........................................................................ 17
BOARD C ATTACHING AND REMOVING........................................................................ 18
BOARD C AND FUSE ATTACHING AND REMOVING .................................................... 19
DC MOTOR UNIT ATTACHING AND REMOVING ........................................................... 20
TRANSFORMER UNIT ATTACING AND REMOVING ...................................................... 21
MACHINE SOCKET UNIT ATTACHING AND REMOVING ............................................... 22
BUTTONHOLE LEVER ATTACHING AND REMOVING................................................... 23
BOARD K ATTACHING AND REMOVING ........................................................................ 24
BUTTONHOLE SENSOR ATTACHING AND REMOVING ............................................... 25
WIRINGDIAGRAM ........................................................................................................... 26
MEMORY CRAFT 3500 DIAGNOSIS CHART.................................................................. 27
MEMORY CRAFT 3500 DIAGNOSIS CHART (NO.2)...................................................... 28
MULTIPLE LANGUAGEFUNCTION ................................................................................. 29

1
TOP COVER & FACE PLATE ATTACHING AND REMOVING
Top cover
To remove:
1.Remove 3 screws (A) & (B) and top cover.
To attach:
2.Attached the top cover with 3 screws (A) and (B).
Face plate
To remove
3.Remove 2 screws (C) and face plate.
To attach
4.Attach the face plate with 2 screws (C).

2
BASE & BED COVER ATTACHING AND REMOVING
Base
To remove:
1. Remove 6 screws (A) and base.
To attach:
2. Attach the base with 6 screws (A).
Bed cover
To remove:
3. Move the drop lever to the left, then remove 2 screws (B).
4. Remove the bed cover.
To attach:
5. Move the drop lever to the left and attach the bed cover with 2 screws (B).

BELT COVER ATTACHING AND REMOVING BELT COVER
To remove:
1. Remove 2 screws (A) and belt cover, then pull out.
To attach:
2. Attach the belt cover with 2 screws (A).
3

FRONT PANEL ATTACHING AND REMOVING FRONT PANEL
To remove:
1. Remove the top cover, belt cover and bed cover (see page 1, 2 and 3)
2. Remove screw (A) and loose screws (B), (C), (D), (E), (F) and (G).
3. Pull out connectors (H) and remove the front panel.
To attach:
4. Insert connectors (H) and attach the front panel.
5. Tighten the screws.
4

5
TO ADJUST THE PRESSER BAR HEIGHT
The standard presser bar height is 6.0 mm between the bottom surface of the foot and needle
plate when the presser bar lifter is in the position.
1. Open the face plate.
2. Raise the presser foot, loosen the presser bar bracket screw and adjust the height to 6.0
mm.
3. Check if the presser foot is parallel to the openings for the feed dog on the needle plate. If not,
adjust it.
4. Tighten the presser bar bracket screw while holding the presser bar to keep the foot parallel
to the openings.
5. Close the face plate.

6
TO ADJUST THE NEEDLE DROP
When you select the pattern ( ), the needle drop should be in the center position of the needle
hole in the needle plate.
When the needle swings in maximum zigzag width, the distance between both edges of
The needle hole on the needle plate and the needle drop position should be equal.
1. Turn on the power switch.
2. Select pattern ( ), or pattern ( ) at maximum zigzag width.
3. Loosen the set screw (A).
4. Turn the eccentric pin to adjust the needle drop.
5. Tighten the set screw (A).
Note: check the hook timing after this adjustment.

7
TO ADJUST THE NEEDLE BAR HEIGHT
The standard distance between the upper edge of the needle eye and the tip of shuttle hook
should be in the range of 1.6-2.0 mm when the tip of shuttle hook meets the right side of the
needle in ascending travel of needle from its left and lowest position.
1. Remove the needle plate & bobbin holder.
2. Turn on the power switch and select the pattern ( ).
3. Turn the hand wheel toward you until tip of shuttle hook meets the right side of the needle.
4. Loosen the needle bar connecting stud set screw.
5. Adjust the height of the needle bar by moving the needle bar upward or downward without
turning it.
(Make sure that the needle setting groove on the needle bar is in the front.
6. Tighten the set screw.
7. Insert the bobbin holder.
8. Attach the needle plate.

8
TO ADJUST THE HOOK TIMING
When the pattern ( ) is selected, 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 should be 3.25 to 3.55 mm.
1. Remove the needle plate and bobbin holder.
2. Turn on the power switch and select the pattern ( ).
3. Remove the top cover, belt cover and bed cover (see pages 1, 2 and 3).
4. Turn the hand wheel toward you and set the needle bar to the lowest posi-tion.
5. In this condition.
* If the projection of feed lifting cam is in the lowest position, loosen the set screws of lower
shaft timing wheel.
* If not, loosen the set screws of upper shaft toothed wheel.
6. Raise the needle bar further 3.25 to 3.55 mm from the lowest position.
7. Turn the lower shaft gear until the tip of shuttle hook meets with the right side of needle.
8. Tighten the set screws of lower shaft timing wheel or upper shaft toothed wheel.
9. Attach the bed cover, belt cover, top cover, bobbin holder and the needle plate.

9
TO ADJUST THE CLEARANCE BETWEEN THE NEEDLE AND THE HOOK
The clearance between needle and shuttle hook should be -0.10 to +0.05 mm. If not, make an
adjustment as follows:
1. Remove the needle plate and bobbin holder.
2. Replace the needle the master needle.
3. Turn on the power switch and select the pattern ( ).
4. Loosen the set screws (B) and (C), and slightly tighten the hinge screw (A).
5. Turn the hand wheel and adjust the clearance between the master needle and the point of
shuttle hook in the left and right needle positions to -0.10 mm to +0.05 mm by moving the
shuttle hook set plate up or down.
6. Tighten the set screws (A), (B) and (C).
7. Replace the master needle with the needle.
8. Insert the bobbin holder and attach the needle plate.

10
TO ADJUST THE BACKLASH OF HOOK DRIVE GEAR AND LOWER SHAFT GEAR
The backlash of gears should be smooth and should be less than 0.8 mm when the tip of
shuttle hook is within the width of the feed dog as shown below.
1. Remove the bed cover (see page 2).
2. Loosen the hexagon socket screw.
3. (A) if the backlash is too great, turn the lower shaft bushing in direction A.
(B) If the backlash is too li1tle, turn the lower shaft bushing in direction B.
4. Tighten the hexagonal socket screw.
5. Attach the bed cover.
Note: After adjusting the backlash, be sure to check and adjust the “HOOK TIM-ING” and the
“FEED DOG HEIGHT” (see pages 8 and 11).

11
TO ADJUST THE FEED DOG HEIGHT
When pressure adjusting lever is at “3” and the presser foot is lowered, the highest
Position of the feed dog should be 0.75 to 0.85 mm from the surface of the needle
Plate.
1. Set the pressure adjusting lever at “3” with the presser foot lowered.
2. Turn on the power switch.
3. Turn the hand wheel toward you to get the highest position of feed dog.
4. Remove the bed cover.
5. Loosen the set screw (A) and nut.
6. Adjust the feed dog height to 0.75 mm to 0.85 mm by turning the adjusting screw (B).
7. Tighten the nut and set screw (A).
8. Attach the bet cover.

12
TO ADJUST THE UPPER SHIELD PLATE POSITION
Whenthemachineissetforzigzagstitching,theneedle should start to swing 6.3mmto7.5 mm above
thesurfaceof the needle plate.
1. Remove top cover.
2. Turn on the power switch and select the pattern ( )
3. Turn the hand wheel toward you slowly with your hand until the needle starts to swing.
(A) If higher than 7.5 mm, loosen the set screws and turn the upper shaft shield plate in
direction of A.
(B) If lower than 6.3 mm, loosen the set screws and turn the upper shaft shield plate in
direction of B.
4. Push the upper shaft shield plate as close as possible to the left. (it should not touch the
upper shaft sensor.) Then tighten the set screw.
5. Turn the hand wheel toward you, and check the start swing.
6. Attach the top cover (see page 1).

13
TO ADJUST THE UPPER THREAD TENSION
The standard of upper thread tension should be 75g to 90g when pulling the thread
(cotton thread #50) in direction a with setting the tension dial at “3” (make sure the
Foot is lowered.)
1. Set the thread tension dial to “3”.
2. Open the face plate and adjust the thread tension by turning the thread tension shaft with a
screwdriver in direction...
(A) to loose the tension.
(B) to tighten the tension.
3. Close the face plate.

14
TO ADJUST THE STRETCH FEED BALANCE
When pattern “ “ is sewn with the feed balancing dial at the standard setting mark
( ), the sewn pattern should be as indicated by the mark “0” the following figure.
1. Set the pattern “ “, and the feed balancing dial at standard setting mark ( ).
2. Remove the screws and base cap as illustrated.
3. Adjust the stretch stitch feed balance by turning the adjusting dial in direc-tion A or B.
4. Attach the base cap with screws.

15
TO REPLACE AND ADJUST THE THREADER PLATE
If the needle threader plate is broken or bent, replace it as follows:
To replace:
1. Turn the hand wheel toward you until the needle bar reaches its highest po-sition and lower
the needle threader knob as far as it will go.
2. Loosen screw (A) and replace the needle threader plate (see the Illustration A).
To adjust:
3. If the hook touches the right or left side of the needle eye, loosen screw (A) and move the
needle threader plate (see the Illustration B).
4. If the hook touches the top or bottom of the needle eye, loosen set screw (B) and move the
position set plate (see the Illustration C).

TO ADJUST THE BUTTONHOLE LEVER
A) Buttonhole lever guide
1. Attach the automatic buttonhole foot (R).
2. Loosen the set screw (A) and leave the clearance of 2.9mm (I) between the spring holder and
slider (B) by moving the buttonhole lever guide (K). In this condition, the buttonhole lever (E)
should touch the spring holder (C) slightly.
3. Tighten the set screw (A).
B) Buttonhole sensor
1. Turn the power switch on while pressing the reverse button, then press BH1 at once. “H SENSOR
H or L” will appear in the screen.
2. Lower the buttonhole lever (E). Then leave the clearance (J) of 1.6mm between the slider (B)
and Spring holder (C).
3. Loosen the set screw (G) and move the buttonhole sensor base plate (F) from the right to
left slowly. At the position where the screen message changes from “H SENSOR L” to “H
SENSOR H” tighten the set screw (G).
4. When the clearance between the spring holder (C) and slider (B) is:
* 1.4mm, the screen shows “H SENSOR H”
* 1.8mm, the screen shows “H SENSOR L”
16

17
BOARD A ATTACHING AND REMOVING
To remove:
1. Remove the front cover unit.
2. Pull out 8 connectors from the board A.
3. Remove 4 screws and board A.
To attach:
4. Follow the above procedure in reverse.

18
BOARD C ATTACHING AND REMOVING
To remove:
1. Remove the front panel unit (see page 4).
2. Loosen screws (A). (B), (C) and (D), and remove screws (E) and (F).
3. Remove the rear cover.
4. Pull out the 4 connectors and remove screws (G).
5. Remove board C.
To attach:
6. Attach board C with 3 screws and insert the connectors.
7. Attach the rear cover with 6 screws.
8. Attach the front panel unit.