Janome Skyline S7 User manual

SERVICE MANUAL
SKYLINE S7
First Edition: 7 August 2015

TABLE OF CONTENTS
Replacing external parts
Face cover ..........................................................................................................................................................1
Belt cover ............................................................................................................................................................1
Top cover ............................................................................................................................................................2
Machine base .....................................................................................................................................................3
Base cover ..........................................................................................................................................................3
Bed cover ...........................................................................................................................................................3
Free arm cover ....................................................................................................................................................4
Front cover ..........................................................................................................................................................5
Rear cover ...........................................................................................................................................................6
Replacing mechanical parts
Needle threader hook .........................................................................................................................................7
Replacing electronic components
Printed circuit board A ........................................................................................................................................8
Printed circuit board F ........................................................................................................................................9
Speed control slider ............................................................................................................................................9
Switching power supply unit .............................................................................................................................10
DC motor ..........................................................................................................................................................11
Thread tension unit ...........................................................................................................................................12
Mechanical adjustment
Feed dog height ................................................................................................................................................13
Needle drop position ........................................................................................................................................14
Presser bar height .............................................................................................................................................14
Clearance between needle and tip of the rotary hook ............................................................................... 15-16
Hook timing ......................................................................................................................................................17
Needle bar height .............................................................................................................................................18
Backlash between hook drive gear and lower shaft gear .................................................................................19
Upper shaft shield plate position ......................................................................................................................20
Upper thread tension.........................................................................................................................................21
Tension release mechanism...............................................................................................................................22
Needle threader hook position ..........................................................................................................................23
Thread drawinf lever ..........................................................................................................................................24
Upper feed dog............................................................................................................................................ 25-27
Buttonhole lever.................................................................................................................................................28
Thread cutter ....................................................................................................................................................29
Presser bar lifter position...................................................................................................................................30
Presser foot lifter stopper position .............................................................................................................. 31-32
Automatic presser foot lifter initializing position................................................................................................33
Presser bar height..............................................................................................................................................34
Embroidery foot height ......................................................................................................................................35
Stretch stitch feed balance ...............................................................................................................................36
Knee lifter...........................................................................................................................................................37

1
Replacing external parts
Face cover
To remove:
1. Remove the setscrews A. Remove the face cover.
To attach:
Follow the above procedure in reverse.
Setscrews A
Belt cover
To remove:
1. Remove the cap and setscrew B.
2. Remove the setscrew C.
3. Loosen the two setscrews D.
4. Pull the rear side of the belt cover to disengage it from
the rear cover.
5. Remove the belt cover.
To attach:
Follow the above procedure in reverse.
Make sure all the tabs and hooks t together precisely.
Cap
Setscrew B
Setscrew C
Setscrews D

2
Replacing external parts
Top cover
To remove:
1. Raise the carrying handle and remove the setscrew A.
2. Open the top cover. Pull out the ange plate from the
bobbin winder spindle.
3. Remove the setscrews B and C.
4. Open the face cover. Close the top cover and raise
the carrying handle.
Pull the top cover toward you to remove it.
To attach:
Follow the above procedure in reverse.
To attach the ange plate, put the ange plate on to the
bobbin winder spindle, and push the ange plate down.
Turn the ange plate until it snaps to the pin of the
bobbin winder spindle.
Setscrew A
Top Cover
Face cover
Carrying handle
Flange plate
Bobbin winder spindle
Setscrew B Setscrew C
Top cover

3
Replacing external parts
Machine base
To remove:
1. Remove the setscrews A.
2. Remove the machine base.
To attach:
Follow the above procedure in reverse.
Base cover
To remove:
1. Remove the setscrews B.
2. Remove the base cover.
To attach:
Follow the above procedure in reverse.
Bed cover
To remove:
1. Remove the setscrews C.
2. Remove the bed cover.
To attach:
Follow the above procedure in reverse.
Setscrews A
Machine base
Setscrews B
Base cover
Setscrews C
Bed cover

4
Replacing external parts
Free arm cover
To remove:
1. Remove the machine base and base cover (see page
3). Remove the presser foot.
Push down the needle plate release lever to remove
the needle plate. Remove the bed cover (see page 3).
2. Remove the threaded pin.
3. Loosen the setscrew and unlock the hook A by sliding
the free arm cover to the left.
4. Pull out the free arm cover forcedly to the left while
pulling open the front side to disengage the hook B and
remove the free arm cover.
To attach:
1. Place the free arm cover on the free arm inserting the
hook C into the opening.
2. Insert the right end of the free arm cover under the
front cover by pushing the right end. Push the free arm
cover until all the hooks and tabs snap in place.
3. Follow the steps 1 to 3 of removal procedure in
reverse.
Needle plate release lever
Needle plate
Pin
Hook A
Setscrew
Hook C
Hook B

5
Replacing external parts
Front cover
To remove:
1. Remove the top cover, belt cover, base cover, machine
base and free arm cover (see pages 1-4).
2. Loosen the setscrews A (underside of the machine).
3. Remove the setscrew B.
4. Loosen the setscrew C (behind the face cover).
5. Loosen the setscrew D (inside of the machine body).
6. Unlock the hooks from the front cover.
7. While pushing the rear cover through the hole A with a
screwdriver, remove the front cover.
Remove the connectors from the circuit board A.
To attach:
Follow the above procedure in reverse.
Refer to page 8 for locating connector posts.
Setscrew A
Setscrew A
Setscrew B
Setscrew D
Setscrew C
Hooks
Hooks
Hole A

6
Replacing external parts
Rear cover
To remove:
1. Lower the presser foot. Remove the belt cover, top
cover and base cover (see pages 1-3).
2. Loosen the setscrew A.
3. Loosen the setscrew B
4. Remove the four setscrews C.
5. Push the rear cover from the holes D and E with a
screwdriver to remove the hook of rear cover.
6. Remove the rear cover.
To attach:
Follow the above procedure in reverse.
Setscrew A
Setscrew B
Setscrew C
Hole D
Hole E

7
Replacing mechanical parts
Needle threader hook
To remove:
1. Push down the threader lever as far as it will go and
hold it in place. Loosen and remove setscrew.
2. Release the threader lever slowly while holding the
threader unit to disengage it from the threader shaft.
3. Disassemble the threader unit and replace the threader
hook. Refer the following part number when ordering
service parts.
862627005: Hook holder (unit)
To attach:
1. Assemble the threader unit and attach them to the
threader shaft by inserting the shaft into the holes.
2. Make sure the pin is engaged in the slot.
Secure the threader unit to the threader shaft by
tightening setscrew.
Adjust the needle threader hook position
(see page 23).
Setscrew
Threader lever Threader unit
Hook holder (unit) (862627005)
Setscrew
Pin is engaged in the slot

8
Replacing electronic components
Printed circuit board A
NOTE:
Do not disconnect connectors by pulling on cord.
To disconnect the connectors, grasp the connector,
not the cord.
To remove:
1. Remove the front cover (see page 5).
2. Disconnect the connectors from the printed circuit
board A.
3. Remove the 4 setscrews and printed circuit board A.
To attach:
Follow the above procedure in reverse.
Refer to the board A schematic for locating the
connectors on the printed circuit board A.
After replacing the printed circuit board A, adjust the fol-
lowing items:
• Knee Lifter (see page 36)
• Presser bar height (see page 34)
• Embroidery foot height (see page 35)
CNASP1
(Blue)
CNALCD1 CNATP1 CNAL1
(Black)
CNAL2
(White)
CNAP1 (Black)
CNACTT1 (Black)
CNAUSB1 (Black)
CNABM1 (White)
CNATTM1 (Black)
CNAUDM1 (Black)
CNAM1 (White)
CNADD1
(Brown)
CNANP1
(White) CNAFM1 (Black) CNATM1 (White)
CNAKL1 (White)
CNAPS1 (White)
CNABH1 (Black)
CNAFU1 (Black)
CNAF1 (Black) Print Board F
CNAVR1 (White)
CNAL3 (Red)
Bobbin Winder Switch
LCD Module
Touch Panel Lighting LED 1
Lighting LED 2
Lighting LED 3
Speed Control Slider
Foot Position Sensor
BH Sensor
Switching Power
Supply
Variable Zigzag Control
Thread Cutter Motor
Feed Motor
Needle Plate Sensor
Feed Dog Sensor
Driving Motor
Presser Foot Motor
Thread Tension Motor
Zigzag Motor
USB Board
External Thread Cutter
Switch Jack
Upper Shaft Phase Sensor
No Connection
No Connection
Board A schematic
Setscrews
Setscrews

9
Replacing electronic components
NOTE:
Do not disconnect connectors by pulling on cord.
To disconnect the connectors, grasp the connector,
not the cord.
Printed circuit board F
To remove:
1. Remove the front cover (see page 5).
2. Disconnect the printed circuit board F connector from
the printed circuit board A (see page 8).
3. Remove the CS rings.
4. Remove the setscrews, and the printed circuit board F.
To attach:
Follow the above procedure in reverse.
Speed control slider
To remove:
1. Remove the front cover (see page 5).
2. Disconnect the speed control slider connector from the
printed circuit board A (see page 8).
3. Remove the CS rings and the speed control slider.
To attach:
Follow the above procedure in reverse.
CS rings
Setscrews
Setscrew
Printed circuit board F
CS rings
Speed control sliderCS ring

10
Switching power supply unit
To remove:
1. Remove the belt cover, the top cover and the front
cover (see pages 1, 2 and 5).
2. Disconnect the switching power supply connector
from the switching power supply unit.
3. Remove the foot control connector from the printed
circuit board A (see page 7).
4. Remove the setscrews, and switching power supply.
To attach:
Follow the above procedure in reverse.
Replacing electronic components
Switching power supply connector
Setscrews
Foot control
connector (cord)
Setscrew

11
Replacing electronic components
DC motor
NOTE:
Do not disconnect connectors by pulling on cord.
To disconnect the connectors, grasp the connector,
not the cord.
To remove:
1. Remove the belt cover, the top cover and the front
cover (see pages 1, 2 and 5).
2. Disconnect the DC motor connector from the printed
circuit board A (see page 8).
3. Remove the motor belt.
4. Remove the setscrews (2 pcs), and the DC motor.
To attach:
1. Attach the DC motor and slightly tighten the setscrews.
2. Attach the motor belt and adjust the belt tension.
Push the middle of the belt span with approximately
200 grams pressure. Adjust the motor position so that
the belt deects 5 mm.
3. Tighten the setscrews securely.
4. Connect the DC motor connector to the printed circuit
board A (see page 7).
5. Attach the front cover, the top cover and the belt cover.
Setscrews
Setscrews
Motor belt
200 gr pressure
5 mm

12
Replacing electronic components
Thread tension unit
NOTE:
Do not disconnect connectors by pulling on cord.
To disconnect the connectors, grasp the connector,
not the cord.
To remove:
1. Remove the belt cover and the top cover (see page 1
and 2).
2. Remove the front cover (see page 5).
3. Disconnect the thread tension motor connector from
the printed circuit board A (see page 8).
4. Remove the setscrews (A) and (B).
Remove the thread tension (unit).
To attach:
1. Follow the above procedure in reverse.
2. Check the upper thread tension (see page 21).
Setscrew A
Setscrew B

13
Nut
Setscrew A Adjusting screw B
Presser foot
0.80 – 0.90 mm
Surface of
needle plate
Feed dog
Hexagonal socket screw I
Setscrew D
Threaded hole C
Adjusting screw B Threaded hole C
Setscrew A
Setscrew D
Mechanical adjustment
Feed dog height
When the foot pressure is set at maximum (AUTO+4) and the presser foot A is lowered, the highest position of the feed
dog should be 0.80 to 0.90 mm from the surface of the needle plate.
1. Attach the zigzag foot A. Remove the bed cover and
base cover (see page 3).
2. Turn the power switch ON. Adjust the foot pressure to
the maximum (AUTO+4) in the ordinary sewing setting
mode. Adjust the stitch length to the maximum (5.0).
3. Press the presser foot lifter button to lower the presser
foot.
4. Turn the handwheel toward you to raise the feed
dog to its highest position.
5. Loosen the setscrew (A).
6. Loosen the nut with a socket wrench.
Turn the adjusting screw and adjust the feed dog hight
to 0.85 mm.
7. Tighten the nut and setscrew (A).
8. Turn the handwheel and check that the feed dog teeth
are pararell with the surface of the needle plate. If not,
follow the adjustment procedure below.
If the feed dog is not parallel to the surface of the needle
plate at its highest position, make the adjustment as
follows:
* For this adjustment, a hexagonal socket screw 4x6, part
No. 000111108 is required.
1. Insert a hexagonal socket screw part No. 000111108
into the threaded hole (C) until it stops (use an Allen
wrench of 2 mm width across ats).
2. Turn the setscrew D (left hand screw) clockwise to
loosen it.
3. Turn the hexagonal socket screw until the feed dog is
parallel with the surface of the needle plate.
4. Tighten the setscrew D by turning it counterclockwise.
5. Remove the hexagonal socket screw.
6. Attach the bed cover and base cover.
After nishing adjustment, return the foot pressure to
AUTO.

14
Eccentric pin
Eccentricity
Pin
Needle hole
0.2 mm or more0.2 mm or more
A = B
Hexagonal
socket screw
"9.0"
"0.0"
Needle drop position "4.5"
Mechanical adjustment
Needle drop position
When the straight stitch is selected, the needle should be positioned in the center of the needle plate hole.
When the needle drop position is set at "0.0" and "9.0", the clearance between the side of the needle and the needle
hole should be 0.2 mm or more.
1. Attach the #14 needle. Turn the power switch ON and
select straight stitch #1.
2. Check the clearance between the needle and the side
of the needle hole when the needle drop position is set
at "0.0" and "9.0" respectively.
3. If the clearance is less than 0.2 mm, adjust it as
follows.
Loosen the hexagonal socket screw (use an Allen
wrench of 2 mm width across ats).
4. Turn the eccentric pin to get 0.2 mm or more clearance.
The direction of eccentric pin should be as shown.
Tighten the hexagonal socket screw.
Attach the straight needle plate and check if the needle
drops in the center of the needle hole.

15
Test pin
Tip of hook
-0.1 to +0.05 mm
Left needle position Right needle position
Clearances A and B must be even
A
B
Mechanical adjustment
Clearance between needle and tip of the rotary hook (method 1)
The clearance between the needle and the point of hook should be -0.1 to +0.05 mm.
Needle bar
supporter
Setscrew
1. Remove the top cover (see page 2).
2. Remove the presser foot, the needle plate and the
bobbin holder.
3. Attach the test pin.
4. Turn the power switch ON while pressing the Start/
Stop button and the Reverse stitch button. The LCD
shows the factory setting mode.
Press "Bobbin" key. The machine will set the zigzag
width at maximum.
5. Turn the handwheel toward you until the tip of the
hook comes behind the test pin.
6. Loosen the setscrew (use an Allen wrench of 2 mm
width across ats) and move the needle bar supporter
in the direction of the red arrow so the test pin just
touch the tip of the hook. Tighten the setscrew.
7. Attach the bobbin holder and the needle plate. Check
the needle drop position. The needle drops in the
center of the needle plate hole as shown.
If the clearances A and B are not even, adjust the needle
drop position rst and then adjust the clearance between
the needle and the tip of the hook by the method (2) on
the next page.

16
Setscrew C
Setscrew B
Setscrew A
Hook base plate
Mechanical adjustment
Clearance between needle and tip of the rotary hook (method 2)
The clearance between the needle and the point of hook should be -0.1 to +0.05 mm.
1. Remove the bed cover (see page 3).
2. Loosen the setscrews A, B and C. Tighten the
setscrew C lightly.
3. Turn the handwheel toward you until the tip of the
hook comes behind the test pin. Adjust the clearance
between the needle and the tip of the rotary hook, by
moving the hook base plate up or down, so the test
pin just touch the tip of the hook.
4. Tighten the setscrews A, B and C.
5. Check the backlash between the lower shaft gear and
the hook drive gear. If the backlash is too great or the
engagement of the gears is too tight, adjust the
backlash (see page 19).

17
Mechanical adjustment
Setscrews A
Bobbin holder Hook Tip of hook
Hook timing
The amount of ascending travel of the needle bar from its lowest position to the position (Needle drop position 0.0)
where the tip of the rotary hook exactly meets the right side of the needle should be 3.70 to 4.00 mm.
To adjust:
1. Remove the bed cover and base cover (see page 3).
2. Attach the needle #14.
3. Turn the power switch ON. Select straight stitch.
Set the needle drop position at "0.0".
* Do not turn the switch OFF.
4. Remove the presser foot, the needle plate and the
bobbin holder. (see page 4)
5. Turn the handwheel toward you to lower the needle at
its lowest position.
6. Loosen the setscrews A (use an Allen wrench of 2
mm width across ats).
7. Turn the handwheel toward you to raise the needle
bar by 3.85 mm from its lowest position.
8. Turn the lower shaft gear until the tip of rotary hook
meets with the right side of the needle.
Tighten the setscrews A.
* Check the needle bar height after this adjustment.
9. Attach the bed cover and base cover.
3.70 to 4.00 mm
Lowest needle position
Needle #14
Hook
Tip of hook meets the
right side of the needle
(Needle drop position 0.0)
Lower shaft gear

18
Mechanical adjustment
1. Attach the needle #14.
2. Turn the power switch ON. Select straight stitch.
Set the needle drop position at "0.0".
* Do not turn the switch OFF.
3. Remove the presser foot, the needle plate and the
bobbin holder.
4. Turn the handwheel toward you until the tip of hook
meets the right side of the needle.
5. Loosen the hexagonal socket screw (use an Allen
wrench of 2 mm width across ats).
6. Move the needle bar to adjust the needle bar height.
Tighten the hexagonal socket screw.
Be careful not to turn the needle bar.
7. Attach the bobbin holder and the needle plate.
Hexagonal socket screw
Needle setting groove
Needle bar
Needle bar height
The distance between the upper edge of the needle eye and the hook race should be in the range of 1.6 to 2.0 mm
when the tip of the hook meets right side of the needle in the needle drop position "0.0" as the needle ascends from its
lowest position.
1.6 to 2.0 mm
Upper edge of the needle eye
Needle #14
Hook
Tip of hook meets the
right side of the needle
(Needle drop position 0.0)
Hook race
Bobbin holder Hook Tip of hook