Janome 1110DX PRO User manual

SERVICE MANUAL
1110DX PRO
First Edition: 22 May 2015

CONTENTS
TO CHANGE THE FACE PLATE UNIT ................................................................ 1
TO CHANGE THE TOP COVER UNIT ................................................................ 2
TO CHANGE THE BELT COVER UNIT............................................................... 3
TO CHANGE THE TENSION COVER UNIT........................................................ 4
TO CHANGE THE PANEL COVER UNIT ............................................................ 5
TO CHANGE THE SIDE COVER UNIT ............................................................... 6
TO CHANGE THE BASE PLATE......................................................................... 7
TO CHANGE THE MACHINE SOCKET UNIT..................................................... 8
TO ADJUST THE NEEDLE BAR HEIGHT........................................................... 9
TO ADJUST THE PRESSER BAR HEIGHT...................................................... 10
TO ADJUST THE FEED DOG HEIGHT............................................................. 11
TIMING OF NEEDLE AND FEED DOG ............................................................ 12
TO ADJUST THE TENSION OF SUB THREAD TENSION DIAL ...................... 13
TO ADJUST THE NEEDLE AND THE UPPER KNIFE TIMING......................... 14
TO ADJUST THE STITCH LENGTH ................................................................. 15
TO ADJUST THE CLEARANCE BETWEEN NEEDLE
AND LOWER LOOPER / NEEDLE GUARDS .........................................16-17
TO ADJUST THE CLEARANCE BETWEEN NEEDLES
AND FIXED NEEDLE GUARD ..................................................................... 18
TO ADJUST THE POSITION OF CHAINING FINGER...................................... 19
TO ADJUST THE NEEDLE AND THE
LOWER LOOPER TIMING ................................................................................ 20
TO ADJUST THE POSITION OF UPPER LOOPER ......................................... 21
TO ADJUST THE UPPER & LOWER LOOPERS TIMING ................................ 22
TO ADJUST THE CLEARANCE BETWEEN LOOPERS................................... 23
TO ADJUST THE CLEARANCE BETWEEN NEEDLE
AND UPPER LOOPER................................................................................. 24
TO ADJUST THE POSITION OF KNIVES......................................................... 25
TO ADJUST THE POSITION OF THREAD GUIDE (3) ..................................... 26
TO ADJUST THE THREAD TENSION DIAL...................................................... 27
PARTS LISTS ...............................................................................................28-49

1
TO CHANGE THE FACE PLATE UNIT
To remove:
1. Loosen the setscrew A and remove the face plate unit.
To attach:
2. Fit the U-groove in the face plate between the setscrew and set plate, put the rib in the tension cover unit,
top cover and rear cover, and tighten the setscrew.
Setscrew A
Setscrew A
Face plate unit
Top cover unit
Rear cover
Set plate
Tension cover unit
U-groove
Rib
Rib

2
TO CHANGE THE TOP COVER UNIT
To remove:
1. Loosen two screws through hole of tension thread guide plate as illustration A, and remove the top cover.
To attach:
2. Put the ribs in tension cover unit, and tighten the setscrew.
Top cover unit
Setscrew
Illustration A
Rib
Tension thread guide plate
Tension cover unit

3
TO CHANGE THE BELT COVER UNIT
To remove:
1. Open the looper cover unit.
2. Loosen setscrew A and remove the setscrew B.
3. Remove the belt cover unit.
To attach:
4. Put the ribs in panel cover unit and tension cover unit, and tighten setscrew A and B.
Tension cover unit
Belt cover unit
Panel cover unit
Looper cover unit
Setscrew A
Setscrew B
Rib
Rib

4
TO CHANGE THE TENSION COVER UNIT
To remove:
1. Remove face plate unit and belt cover unit.
2. Remove setscrew A and B, and remove tension cover unit.
To attach:
3. Put ribs in panel cover unit, and tighten the setscrew A and B.
4. Attached the belt cover unit and face plate unit.
Setscrew A
Setscrew B
Tension cover unit
Cover panel unit
Rib

5
TO CHANGE THE PANEL COVER UNIT
To remove:
1. Remove face plate unit, belt cover unit and tension cover unit.
2. Move the upper looper to its lowest position by turning the valance wheel in counterclockwise.
3. Remove setscrew A, B, C, D and E, and remove the panel cover unit.
To attach:
4. Attach the panel cover unit, and tighten setscrews A, B, C, D and E.
(To set the thread take-up lever position, the thread take-up lever and the thread take-up lever cover
should be set at F position as shown fig. 3.)
5. Attached the tension cover unit, belt cover unit and face plate unit.
Setscrew D Thread take-up lever cover
Take-up lever
F
(Fig. 3)
(Fig. 2)
Panel cover unit
Take-up lever
Setscrew E
Setscrew A
Setscrew B
Setscrew C
Upper looper
(To be lowest position)
(Fig. 1)

6
TO CHANGE THE SIDE COVER UNIT
To remove:
1. Loosen setscrew A and remove the side cover unit.
To attach:
2. Fit the U-groove in the side cover unit between the setscrew and set plate.
3. Tighten the setscrew A.
Setscrew A
U-groove
Set plate
Side cover unit

7
TO CHANGE THE BASE PLATE
To remove:
1. Remove the setscrew A, B, C, D and two hinge screws E, and remove the rubber cushions.
2. Remove the base plate.
To attach:
3. Attach the base plate, and tighten the setscrew A, B, C and D.
4. Attach the rubber cushions, washers, and tighten the hinge screws.
Setscrew A
Base plate
Setscrew B
Setscrew C
Setscrew D
Washer
Setscrew E
Rubber cushion
Use white washer
in this position

8
TO CHANGE THE MACHINE SOCKET UNIT
To remove:
1. Remove the belt cover.
2. Remove the two setscrew A, and pull out the cord connectors.
To attach:
3. Inset the cord connectors as shown below.
4. Attach the machine socket unit, and tighten the two screws.
5. Attach the belt cover unit.
Machine socket unit
for 120V
Machine socket unit
for 240V
For 120V
For CSA
For 120V
For UL
For 240V
To lamp socket
Motor lead cord
Setscrew A
Lamp socket lead cord
Lamp socket lead cord
Lamp socket lead cord
Motor lead cord
Motor lead cord
To motor
Cord with ridge
Cord with ridge
(Blue)
(Blue)
(Brown)
(Brown)

9
TO ADJUST THE NEEDLE BAR HEIGHT
Correct Setting:
The distance between the tip of needle on the right and the surface of needle plate should be 11.2 to 11.6
mm when the needle bar is at the highest position.
To adjust:
1. Remove the face plate unit.
2. Turn the balance wheel toward you with your hand, and set the needle bar at the highest position.
3. Loosen the setscrew A to adjust the height, and tighten, the setscrew A after the adjustment is done.
4. Turn the balance wheel toward you one cycle, and recheck the needle bar height.
5. Attach the face plate unit.
Setscrew A
Needle bar
Needle No. 14
11.2 to 11.6 mm
Surface of needle plate

10
TO ADJUST THE PRESSER BAR HEIGHT
Correct Setting:
The distance between the surface of needle plate and bottom of presser foot should be 4.7 to 5.3 mm (47/254
to 53/254”) when the presser bar lifter is raised.
To adjust:
1. Remove the face plate unit.
2. Remove the setscrew A to move the lamp socket unit.
3. Raise the presser bar lifter, and loosen the setscrew B.
Then adjust the presser bar height, the side of presser foot should be parallel with the hole of needle plate.
4. Tighten the setscrew B.
5. Tighten the setscrew A.
6. Attach the face plate unit.
Presser bar lifter
To be parallel
4.7 ~ 5.3 mm
(Direction of presser foot)
Setscrew B
Setscrew A
(3 pcs)
Top surface of needle plate
Lamp socket unit

11
TO ADJUST THE FEED DOG HEIGHT
Correct Setting:
When the presser foot is lowered and the feed dogs are at their highest position, the distance between the
surface of needle plate and bottom of presser foot should be 0.75 to 0.95 mm.
To adjust:
1. Set the stitch length dial at “3” and the differential feed dial at “1.0”.
2. Lower the presser foot and raise the feed dogs to their highest position by turning the balance wheel.
3. Loosen the main & sub feed dog screws (4 pcs).
4. Push the main feed dog straight upward and adjust the distance between the surface of needle plate and
bottom of presser foot, then tighten the setscrews (2 pcs).
5. When the top of the main feed dog is level to the top surface of needle plate in its downward motion by
turning the balance wheel.
Loose setscrews for sub feed dog (2 pcs), and push the sub feed dog straight upward until its top surface
is to be level to the top surface of needle plate. Then tighten the setscrews of sub feed dog.
6. Check if these feed dogs are attached in parallel to the surface of needle plate while turning the balance
wheel.
Parallel to the surface of needle plate
Surface of needle plate
Push straight up
Push straight up

12
TIMING OF NEEDLE AND FEED DOG
Correct Setting:
When the tip of right needle is at 2 mm above the needle plate in its downward motion, and lowered presser
foot, the top of the feed dog tenth should be level to the top surface of needle plate at their rearmost position.
To adjust:
1. Remove the base plate.
2. Loose setscrew A and remove setscrew B, remove cover plate.
3. Loose setscrew C and remove balance weight, loose setscrew D and remove knife cam, loose setscrew E
and remove link pin, upper knife rod.
4. Set feed regulator dial to 3.0, differential dial to 1.0.
5. Raise the presser foot and move the tip of right needle is at 2 mm above the needle plate in its downward
motion by turning the balance wheel.
6. Lower the presser foot, and loose the two screws F and adjust the position of the feed cam while aiming the
guide line.
* Turn the feed cam to the direction G if the feed dogs are lower than the surface of the needle plate.
* Turn the feed cam to the direction H if the feed dogs are higher than the surface of the needle plate.
7. Loose the two screws I, turn the balance wheel to get the hole 2.5 mm of sub feed cam in front position, put
the guide pin through the sub feed to main feed cam, tighten the setscrews I.
(Clearance between main feed cam and bushing is to be 1 mm).
8. Attach the link pin through the upper knife rod, and attach the balance weight and knife cam to main shaft,
and set to guide line, tighten the setscrews C and D.
9. Attach the cover plate and base plate.
Cover plate
Setscrew A
2 mm
The top surface of feed dog
The end of feed movement
Setscrew I
Setscrew E
Setscrew F
Setscrew B
Setscrew D
Setscrew C
Direction H
Direction G
Link pin
Upper knife connecting rod
Guide line on main shaft
Balance weight (left)
Upper knife drive cam
Main feed cam
Sub feed cam
Guide pin
Hole 2.5
The clearance between the bushing and
main feed cam should be 1 mm
The top surface
of needle plate

13
TO ADJUST THE TENSION OF SUB THREAD
TENSION DIAL
After the correct thread tension for 4 thread overlook standard sewing, slide the slider from “STD.” position to “R. H.”
position without turning the thread tension dials.
(Make sure the thread guide is set at “3/4” position.)
Also adjust the sub thread tension dial as follows.
(Make sure the chaining finger position is set at “R” position and remove the left needle and thread.)
1. When the lower looper thread tension is looser, turn the adjusting screw to “A” direction.
2. When the lower looper thread tension is tighter, turn the adjusting screw to “B” direction as figure.
Note: If the tension is not correctly se within two turns of the adjusting screw, do not turn the adjusting
screw.
Make sure the other part of mechanism or the other adjustments are correctly se or not.
Slider
Thread guide
Direction B
Direction A
Adjusting screw

14
TO ADJUST THE NEEDLE AND THE UPPER
KNIFE TIMING
Correct Setting:
The upper knife timing is the same as that of the needle bar. In fact, when the needle bar is at its highest
position the upper knife should be also at its highest position.
To adjust:
1. Remove the cover plate.
2. Loose the two setscrews A and remove the balance weight.
3. Loose the two setscrews B, and adjust the needle and upper knife timing.
* Turn the upper knife drive cam to the direction D when the upper knife timing is being delay.
* Turn the upper knife drive cam to the direction E when the upper knife timing is too soon.
4. Tighten the two setscrew B firmly. Attach the balance weight and set to guide line on the balance weight is
in line with the one on main shaft and tighten two setscrew A.
5. Turn the balance wheel toward you one cycle, and recheck the needle and the upper knife timing.
6. Attach the cover plate.
Upper knife drive cam
Upper knife
Guide line on main shaft
Setscrew A
Setscrew B
Direction E
Direction D
When the needle bar goes up,
the upper knife goes up.
When the needle bar goes down,
the upper knife also goes down.

15
TO ADJUST THE STITCH LENGTH
Correct Setting:
The actual stitch length should be 2.8~3.0 mm when the stitch dial is set at “3”.
To adjust:
1. Set the stitch length dial at “3” and the differential feed dial at “1.0”.
2. Remove the face plate unit, belt cover unit, tension cover unit and panel cover unit.
3. If the actual stitch length is larger than 3.0 mm, turn the adjusting screw in the direction A.
If the actual stitch length is smaller than 2.8 mm, turn the adjusting screw in the direction B.
4. Attach the panel cover unit, tension cover unit, belt cover unit and face plate unit.
2.8 ~ 3.0 mm
Adjusting screw
Direction B
Direction A
Stitch length
Stitch length “3”
Differential feed dial
Differential feed ratio “1.0”

16
TO ADJUST THE CLEARANCE BETWEEN NEEDLE
AND LOWER LOOPER / NEEDLE GUARDS
Correct Setting:
When using A #11 needle, when the tip of the lower looper comes from the left just behind the needle on the
left or right, the clearance between both needles and the lower looper should be 0 to 0.05 mm, for A #14
needle, the clearance should be 0 to 0.05 mm when the needles are pushed slightly by the front needle guard.
In this condition, the clearance between both needles, and the rear needle guard should be 0 to 0.2 mm.
To adjust:
1. Remove the face plate unit, presser foot, needle plate and needles. Insert A #11 needle on the right.
* To replace A needle, loosen the two screws on the needle clamp.
2. Turn the handwheel toward you to bring the tip of the lower looper just behind the needle from the left.
3. Loose the two setscrews A, move front needle guard toward you to get clearance between the front needle
guard and the needle.
4. In this condition, the clearance between the right needle and lower looper should be 0 to 0.05 mm. If not,
loosen hexagon bolt B just enough to move the lower looper driving arm. Move it backward or frontward to
get the proper clearance between lower looper and needle, tighten hexagon bolt B firmly.
5. Insert A #11 needle the left.
6. Turn the balance wheel toward you to bring the tip of the lower looper just behind the needle on the left
from the left.
7. Clearance between left needle and lower looper should be 0 to 0.05 mm. If not, set the needle gauge (787-
G02) as shown. Loosen set screw C and turn the needle bar in direction D or E to get proper clearance
between left needle and lower looper.
Tighten setscrew C firmly.
8. Remove the gauge.
* There should be no clearance between the needle bar lower bushing and the gauge.
To adjust the position of the front needle guard:
9. Replace both #11 needles with #14 needles.
10.Push the front needle guard slightly to adjust the clearance between the #14 needles and the lower looper
to 0 to 0.05 mm. Tighten setscrew A.
Note: No need to adjust the position of tear needle guard.
11.Check the lower looper timing.
12.Check the clearance between loopers.
13.Attach the face plate unit, the needle plate and presser foot.
Illustrations are shown on the following page

17
Rear needle guard
Rear needle guard
Rear needle guard
Needle clamp
No clearance
Needle gauge
(787-G02)
Needle bar lower bushing
Needle bar
Needle
Front needle guard
Front needle guard
Setscrew A
Setscrews F
Needle #11
Needle #14
0 to 0.05 mm
0 to 0.2 mm
0 to 0.05 mm
Front needle guard
Hexagon bolt B
Lower looper driving arm
Lower looper
Lower looper
Lower looper
Lower looper
(D)
(E)

18
TO ADJUST THE CLEARANCE BETWEEN NEEDLES
AND FIXED NEEDLE GUARD
Correct Setting:
The clearance between needle and the fixed needle guard should be 0.1 to 0.4 mm.
To adjust:
1. Remove the foot and the needle plate and lower the needle to its lowest position.
2. Loose the setscrew A and adjust the position of the fixed needle guard.
3. Tighten the setscrew A.
4. Attach the needle plate and the foot.
Chaining finger
(Needle plate setting knob is to be “S”)
The clearance between the needle and
fixed needle guard
Chaining finger
Fixed needle guard
Tip of fixed needle guard
Needle plate setting knob
Fixed needle guard
0.1 ~ 0.4 mm
Needle
To be touch
Setscrew A