Janome 625E User manual

SERVICE MANUAL
MODEL 625E

SERVICE MANUAL
Service Access (1) Face plate ................................................................................... 1
Service Access (2) Base cover .................................................................................. 2
Service Access (3) Front cover .................................................................................. 3
Service Access (4) Rear cover .................................................................................. 4
Adjusting Thread Tension ........................................................................................... 5
Adjusting Presser Foot Height and Alignment ........................................................... 6
Adjusting Needle Swing ............................................................................................. 7
Adjusting Needle Drop Position ................................................................................. 8
Adjusting Hook Timing ............................................................................................... 9
Adjusting Needle Bar Height ..................................................................................... 10
Adjusting Clearance between Needle and Hook Point ............................................. 11
Adjusting Backlash between Hook Drive Gear and Lower Shaft Gear ..................... 12
Adjusting Feed Dog Height ....................................................................................... 13
Adjusting Feed Balance ............................................................................................ 14
Adjusting Buttonhole Feed Balance .......................................................................... 15
Adjusting Buttonhole Zero Feed ............................................................................... 16
Adjusting Buttonhole Function .................................................................................. 17
Replacing Motor and Adjusting Motor Belt Tension .................................................. 18
Replacing and Adjusting Threader ............................................................................ 19
Replacing Printed Circuit Board B and Fuse ............................................................ 20
TABLE OF CONTENTS

1
MODEL 625E
Setscrew
Face plate
Service Access (1)
Cap
• Face plate
<To remove>
Remove the cap and setscrew. Remove the face plate.
<To attach>
Attach the face plate with the setscrew. Attach the cap.

2
MODEL 625E
<To remove>
Remove the setscrews (6 pcs.) and remove the base cover.
<To attach>
Shift the drop feed lever in the direction of the arrow. Attach the base cover with setscrews.
• Base cover
Setscrew
Setscrew
Setscrew
Base cover
Service Access (2)
Setscrew
Setscrew
Setscrew
Drop feed lever

3
MODEL 625E
Hook
Setscrew (C)
(two off)
<To remove>
Remove the face plate and base cover (see pages 1 and 2).
Pull out the pattern selector dial and stitch length dial.
Remove the setscrews (A), (B) and (C) (two off).
Remove the front cover, unlocking all the hooks.
<To attach>
Follow the above procedure in reverse.
• Front cover
Service Access (3)
Pattern selector dial
Hooks
Setscrew (A)
Setscrew(B)
Front cover
Stitch length dial
Hook

4
MODEL 625E
Service Access (4)
• Rear cover
<To remove>
Remove the face plate, base cover and front cover (see pages 1-3).
Remove the setscrews (A), (B), (C) and (D).
Lower the presser foot lifter and pull away the rear cover from the machine, clearing the parts (1),
(2) and (3), in this order.
<To attach>
Follow the above procedure in reverse.
Front cover
Setscrew (C)
Setscrew (B)
Setscrew (D)
Setscrew(A)
Setscrew (B)
Presser foot lifter
(1)
(2)
(3)

5
MODEL 625E
• The standard tension should be 75 - 90 grams measured with a white
polyester thread #50 being pulled in the direction of the arrow, when the
tension dial is set at "4".
Adjusting Thread Tension
<To adjust>
Remove the front cover (see apge 3).
Set the tension dial at "4".
If the tension is too tight, turn the adjusting dial in the direction (A).
If the tension is too loose, turn the adjusting dial in the direction (B).
Check the tension again and attach the front cover.
(B)
(A)
Pull the thread in this direction at approx.
110 mm per second.
White polyester thread #50
Adjusting dial
Adjusting dial

6
MODEL 625E
• The distance between the bottom of the presser foot in up position and the needle plate
should be 6.0 mm.
<To adjust>
Remove the face plate and needle.
Lower the feed dog below the needle plate. Place a block 6 mm thick under the presser foot
and lower the presser foot lifter.
Loosen the setscrew (A). Raise the presser foot lifter and tighten the setscrew (A) firmly.
Attach the needle and face plate.
Attach the face plate.
NOTE:
Make sure that the presser foot should be parallel to the feed dog slots (B) in the needle
plate.
Setscrew (A)
6mm
Presser foot height
Presser foot
Needle plate
Feed dog
Presser foot alignment
Presser foot should
be parallel to the
feed dog slots.
Adjusting Presser Foot Height and Alignment
Block (B)

7
MODEL 625E
• If the needle swing when it is still in the fabric, correct it as follows.
<To adjust>
Remove the front cover (see page 3).
Select the zigzag stitch ( ) and set the stitch wodth dial at 5.0.
Loosen the setscrews on the worm.
While holding the worm as not to rotate, turn the handwheel to adjust the needle bar
swing so that the needle starts to swing 2 - 3 mm above the needle plate in the right
outflow.
Tighten the setscrews on the worm securely.
Attach the front cover.
Note:
The upper shaft should turn smoothly without an excessive backlash between the worm
and gear.
Adjusting Needle Swing
Upper shaft
Setscrew
Worm
Needle plate
2 to 3mm
Backlash
increases
Backlash
decreases
Note:
Make sure the worm does not
move sideways when turning the
handwheel, otherwise the
backlash will change.

8
MODEL 625E
• The clearance between the needle and side edges of the needle hole should be 0.2
mm or more when the maximum width zigzag stitch ( ) is selecte. And the neddle
should drop in the center of the needle hole when the straight stitch is selected.
<To adjust>
Remove the face plate (see page 1).
Select the straight stitch ( ) and set the stitch width at 5.0.
Loosen the setscrew.
Move the needle bar supporter so that the needle drops in the center of the needle hole.
Tighten the setscrew.
Select the zigzag stitch ( ) and set the stitch width dial at 5.0 to check the clearance
between needle and side edges of the needle hole.
Attach the face plate.
Adjusting Needle Drop Position
Setscrew
Needle hole
AB
A=B
Needle bar supporter

9
MODEL 625E
Adjusting Needle to Hook Timing
• The amount of ascending travel of the needle in the maximum width zigzag stitch ( ) from
the right lowest position should be 1.4 to 2.0 mm where the hook point meets the right side
of the needle.
<To adjust>
Select the maximum width zigzag stitch ( ) and set the stitch width dial at 5.0.
Remove the base cover (see page 2).
Remove the needle plate and bobbin holder.
Loosen the setscrews on the lower shaft gear.
Turn the handwheel toward you to bring the needle to the right lowest position. Then
raise the needle 1.7mm from the lowest position.
While holding the handwheel as not to move the needle bar, rotate the hook race until the
hook point meets the right side of the needle.
Tighten the setscrews.
Attach the boobin holder and needle plate.
Attach the base cover.
Note: Before performing this adjustment, be sure to check the needle bar height.
Needle plate
Bobbin holder
Lower shaft gear
Setscrews
(2 off)
1.4 - 2.0 mm
Lowest position
of the needle
Hook point meets the right
side of the needle.
Needle in right position

10
MODEL 625E
• The standard distance between the upper edge of the needle eye and the upper surface
of the hook race should be in the range of 3.0 - 3.6 mm when the hook point meets the
right side of the needle in its ascending travel from the right lowest position of the
maximum width zigzag stitch ( ).
<To adjust>
Select the maximum width zigzag stitch ( ) and bring the needle to the right lowest
position.
Remove the face plate (see page 1).
Remove the needle plate and bobbin holder.
Turn the handwheel toward you until the hook point meets the right side of the needle.
Loosen the setscrew and move the needle bar up or down to adjust the needle bar height.
Note: Be careful not to rotate the needle bar.
Tighten the setscrew.
Attach the bobbin holder, needle plate and face plate.
Note:
Before performing this adjustment, check the needle to hook timing.
Adjusting Needle Bar Height
Setscrew
Needle in right position
Hook point meets the right side of
the needle.
3.0 - 3.6 mm
Upper edge of
needle eye
Hook race unit
Needle plate
Bobbin holder
Upper surface of hook race

11
MODEL 625E
• The standard clearance between the needle and hook point should be
-0.10 to +0.05 mm.
<To adjust>
Select the maximum width zigzag stitch ( ).
Remove the base cover (see page 2). Remove the needle plate and bobbin holder.
Replace the needle with the test pin. Loosen the setscrews (B) and (C). Slightly loosen
the setscrew (A).
Turn the handwheel toward you to bring the hook point behind the test pin.
Adjust the clearance to -0.1 to +0.05 mm by moving the hook base plate up or down.
Tighten the setscrews (A), (B) and (C) securely.
Check the backlash of the hook drive gear and lower shaft gear.
Note: Adjust the backlash if neccessary (see page 12).
Attach the base cover.
Replace the test pin with the needle. Attach the bobbin holder and needle plate.
Adjusting Clearance between Needle
and Hook Point
Needle plate
Bobbin holder
Test pin
Hook point
Setscrew (A)
Setscrew (B)
Hook base palte
Setscrew (C)
–0.1 to +0.05 mm

12
MODEL 625E
Adjusting Backlash between Hook Drive Gear
and Lower Shaft Gear
• The rotary play should be 0.8 mm or less when the hook point is within the span of the
feed dog, and the gears should turn smoothly.
<To adjust>
Remove the base cover (see page 2).
Loosen the setscrews.
If the backlash is too big, turn the lower shaft bushing in the direction (B).
If the gear engagement is too tight, turn the lowershaft bushing in the direction (A).
Tighten the setscrews and attach the base cover.
Note:
Be sure to check and adjust the needle to hook timing and feed dog height if neccessary,
after performing this adjustment.
Span of feed dog
Hook point
Check rotary play.
Lower shaft bushing
Lower shaft bushing
Lower shaft gear
A
B
A
B
Hook drive gear

13
MODEL 625E
Adjusting Feed Dog Height
<To adjust>
Select the straight stitch ( ) and set the stitch width at "4".
Lower the presser foot. Turn the handwheel to bring the feed dog to its heighest position.
Remove the base cover (see page 2).
Loosen the setscrew (A) and nut.
Turn the adjusting screw to set the feed dog height to 0.75 to 0.85 mm.
Tighten the nut and setscrew (A).
Attach the base cover.
Presser foot
0.75 to 0.85mm
Needle plate
Feed dog
To raise
To lower
Adjusting screw
Nut
Setscrew (A)
•The standard height of the feed dog should be 0.75-0.85 mm above the needle plate when
the feed dog is at its highest position.

14
MODEL 625E
A
AB
1
23
A
A
1
23B
A
A
1
23B
AB ABAB
The forward feeding (A) and backward feeding (B) should be equal when sewing stretch
stitch pattern.
<To adjust>
Select the straight stretch stitch ( ).
Place a piece of paper under the foot. Turn the handwheel to check the needle marks.
Remove the cap to access the adjusting screw.
If the forward feeding (A) is longer than backward feeding (B), turn the adjusting screw in the
direction (C).
If the forward feeding (A) is shorter than backward feeding (B), turn the adjusting screw in the
direction (D).
Attach the cap.
Adjusting Feed Balance
(D) (C)
Adjusting screw
Cap

15
MODEL 625E
(C)(D)
(A) (B)
Cap
Adjusting screw
Adjusting Buttonhole Feed Balance
• When sewing a buttonhole, the stitches on each side of the buttonhole should be the same
density.
The range of 9 to 12 stitches in the right side row against 10 stitches in the left side row is
considered acceptable.
<To adjust>
Sew a test buttonhole and count the stitches on each side.
Remove the cap to access the adjusting screw.
If the left row is denser (A), turn the adjusting screw in the direction (C).
If the left row is coarser (B), turn the adjusting screw in the direction (D).
Attach the cap.

16
MODEL 625E
Adjusting Buttonhole Zero Feed
• If the fabric is fed when sewing a bartack of the buttonhole, correct it
as follows:
<To adjust>
Sew a test buttonhole to check if the fabric is fed while sewing the bartacks.
Remove the cap to access the adjusting screw.
If the fabric is fed foward (A), turn the adjusting screw in the direction (C).
If the fabric is fed backward (B), turn the adjusting screw in the direction (D).
Attach the cap.
Bartack
Bartack
Cap
Adjusting screw
Adjusting screw
(B)
(A)
Stitch length dial
(D) (C)

17
MODEL 625E
Short Standard Long
Adjusting Buttonhole Function
<To check>
Buttonhole should be about 3mm longer than the length set by the R foot.
if this length cannot be obtained, then check and adjust as follows:
<To adjust>
Lower the feed dog and set the R foot.
Remove the face plate. Loosen the setscrew (A).
Lower the buttonhole lever to its lowest position and press it against the R foot.
Press the plate (B) against the front base plate lightly. Move the plate (C) so that it
contacts with the plate (D) and tighten the setscrew (A).
Raise the feed dog and sew a test buttonhole to check the length.
Move the plate (C) in the direction of (E) if the buttonhole stitch length is longer than
the standard,or in the direction of (F) if the buttonhole stitch length is shorter than the
standard.
Tighten the setscrew (A).
Attach the face plate.
Front base plate
Plate (B)
Plate (C)
Setscrew (A)
BH lever
Against R foot
Plate (B) Press the plate (B)
against the front
base plate
Contact lightly
(D)
Setscrew (A)
(E)
(F)

18
MODEL 625E
Motor connector
Circuit board B case
Replacing Motor and Adjusting Motor Belt Tension
<To replace the motor>
Remove the face plate, base cover, front cover and rear cover (see pages 1 to 4).
Remove the case, disconnect the motor connector. (see page 20).
Remove the setscrews (C) and motor.
To attach the motor, follow the above procedure in reverse.
<To adjust the motor belt tension>
Slightly loosen the setscrews (C).
While pushing the middle of the motor belt with a 300 grams load, move the motor up or down so
that the belt deflects 7 to 9 mm.
Tighten the setscrews (C) securely.
Setscrew (C)
Motor
7 to 9 mm
300 grams load