Janome GREEN 19 NEW EDITION User Manual
SERVICE MANUAL
3160QDC
INDEX
What to do when .............................................................................................................................. 1 - 3
Changing External Parts
Face Cover ............................................................................................................................................. 4
Free-arm Cover...................................................................................................................................... 5
Front Cover ....................................................................................................................................... 6 - 7
RearF Cover...........................................................................................................................................8
Mechanical Adjustment
Presser Bar Height................................................................................................................................. 9
Needle Drop Position ........................................................................................................................... 10
Adjustment of Hook Timing .................................................................................................................. 11
Adjustment of Needle Bar Height......................................................................................................... 12
Clearance between Needle and Tip of Hook Rotary............................................................................ 13
Feed Dog Height .................................................................................................................................. 14
Feed Dog Adjustment (Only for model 3160QDC)............................................................................... 15
Top T ension .......................................................................................................................................... 16
Replacing the Electronic Components
Circuit Board-A connection .................................................................................................................. 17
Self-diagnostic T est ......................................................................................................................... 18-22
Circuit Board-A................................................................................................................................23-24
Driving Motor........................................................................................................................................ 25
Switching regulator Unit ....................................................................................................................... 26
Adjusting Buttonhole Lever Position..................................................................................................... 27
Parts List........................................................................................................................................ 29-43
What to do when
Condition Cause How to fix Reference
1. Skipping
Stitches
1. Needle is not inserted properly.
2. Needle is bent or worn.
3. Incorrectly threaded.
4.Needle or thread are
inappropriate for the fabric being
sewn.
5. Sewing on stretch fabric.
6. Inappropriate needle bar height.
7. Inappropriate needle to hook
timing.
8. Inappropriate needle to hook
clearance.
Insert the needle properly.
Change the needle.
Rethread.
Use the recommended sewing needle
and thread.
Use a HA x #11 blue tip needle.
See mechanical adjustment “Needle bar
height”.
See mechanical adjustment “Adjustment
of hook timing”.
See mechanical adjustment “Clearance
between needle and tip of the rotary
hook”.
P. 12
P. 11
P. 13
2. Fabric not
moving
1. Incorrect feed dog height.
2. Feed dog is in down position.
3.Thread on bottom side of fabric is
jammed up.
4. Feed dog teeth are worn.
Adjust the presser bar level to make the
pressure stronger. See mechanical
adjustment “Feed dog height”.
Raise the feed dog.
Make sure to bring both needle and
bobbin threads under the foot when
start sewing.
Change the feed dog.
P. 14
1
Condition Cause How to Fix Reference
3. Breaking
upper thread.
4. Breaking
bobbin thread.
1. Initial sewing speed is too fast.
2. Thread path is incorrect.
3. Needle is bent or dull.
4. Top tension is too strong.
5. Needle size is inappropriate for
fabric.
6. Needle eye is worn.
7. Needle hole in needle plate is
worn or burred.
1. Bobbin holder is incorrectly
threaded.
2. Too much thread is wound on
the bobbin.
Start with medium speed.
Use the proper thread path.
Replace with a new needle.
Adjust top tension correctly.
Use appropriate needle for fabric and
thread in use.
Change the needle.
Repair the hole or replace the needle
plate.
Set the bobbin thread correctly.
Adjust the position of bobbin winder
stopper.
5. Needle
breakes
3. Lint is stuck inside the bobbin
holder.
4. Thread quality is too low.
5. Thread is jamming around the
bobbin holder.
1. Needle is hitting the needle plate.
2. Needle is bent or worn.
3. Needle is hitting the hook.
4. Fabric is being pulled too strongly
while sewing.
Clean the bobbin holder.
Change to a high quality sewing thread.
Clear out the jamming thread.
See mechanical adjustment “Needle
drop position”.
Change the needle.
See mechanical adjustment “Clearance
between needle and tiip of the rotary
hook”.
Guide the fabric gently while sewing.
P. 10
P. 13
2
Condition Cause How to fix Reference
6. Noisy
operation
7. Deformation
pattern
1. Bac klash between hook gear and
lower shaft gear is too great.
2. Lower shaft gear is loose.
3. Inappropriatte belt tension.
4. Not enough oil.
5. Upper shaft gear is loose.
1. Inappropriate feed balance.
2. Top tension is too strong.
Eliminate the backlash.
Eliminate the looseness.
See part removal and replacement
“driving motor (DC motor)”.
Oil all moving parts.
Eliminate the looseness.
Adjust the feed balancing screw.
See mechanical adjustment
“Top tension”.
P. 25
P. 16
3
Changing External Parts
Face cover
To remove:
1. Loosen the setscrew q and lift the face cover to disengage the rib on the inside. Remove the face cover w.
To attach:
2. Follow the above procedures in reverse.
q
w
4
Changing External Parts
Free-arm cover
To remove:
1. Loosen the setscrew q and w. Move the free-arm cover to the left. Remove the free-arm cover.
To attach:
Follow the above procedures in reverse.
e
q
w
5
Changing External Parts
Front cover (1)
To remove:
1. Remove the face cover and free-arm cover (See page 4 and 5).
2. Remove the setscrews (A) q (2 pcs.).
3. Remove the setscrews (B) w (5 pcs.), back cover e.
4. Remove the setscrews (C) r (2 pcs.).
5. Disconnect all the connectors from the circuit board A.
NOTE:
Do not disconnect the connectors by pulling on cord.
To disconnect, grasp the connector, not the cord.
To attach:
6. Follow the above procedures in reverse.
q
e
w
w
w
r
6
r
Changing External Parts
Front cover (2)
4. Disengage the front cover and rear cover hooks.
5. Remove the front cover.
To attach:
Follow the above procedures in reverse.
7
Changing External Parts
Rear cover
To remove:
1. Remove the face cover and free-arm cover (See page 4 and 5).
2. Remove the setscrews (A) q (4 pcs.).
3. Remove the setscrews (B) w (5 pcs.) and back cover.
4. Remove the setscrews (C) e (2 pcs.). Remove the rear cover.
To attach:
5. Follow the above procedures in reverse.
q
Rear cover
q
Back cover
w
w
e
8
Mechanical Adjustment
Presser bar height
The distance between the bottom of the presser foot in up position and the needle plate should be 6.0 mm.
1. Remove the face plate and needle.
2. Lower the feed dog below the needle plate. Place a block 6 mm thick under the presser foot and lower the
presser foot lifter w.
3. Loosen the setscrew q. Raise the presser foot lifter and tighten the setscrew q firmly.
Attach the needle and face plate.
NOTE:
Make sure that the presser foot should be parallel to the feed dog slots e in the needle plate.
q
w
６.０mm
Presser foot should be
parallel to the feed dog slots.
e
9
Mechanical Adjustment
Needle drop position
Set the stitch pattern to “ ”. The standard needle drop position should be at center of the needle plate hole q.
Select zigzag stitch “ ”, and set the stitch width at “5.0”. The clearance between the needle and the edge of
the needle hole in the needle plate should be at least 0.2 mm on either side. If not, adjust as follows:
1. Turn the power switch off. Remove the face cover. (See page 4.)
2. Loosen the hexagonal sock et screw 3 x 4 w. Adjust the needle drop position by turning the eccentric pin e.
The direction of eccentric pin should be as shown in Fig. 1.
3. Attach the face cover.
NOTE:
Check the hook timing after this adjustment.
Fig. 1
10
0.2 mm
or more
q
0.2 mm
or more
Ａ=Ｂ
Mechanical Adjustment
Adjustment of hook timing
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 the power switch on.
3. Select the pattern (left position). Set the zigzag width at 0.
4. Remove the free-arm cover.
Turn the handwheel toward you to lower the needle at its lowest position.
5. Loosen the hexagonal socket screw w (2 pcs.).
6. Move the needle bar 3.4 mm from the lowest position.
7. Turn the lower shaft gear until the tip of hook meets the right side of the needle while holding the handwheel.
8. Tighten the hexagonal socket screw w (2 pcs.).
9. Attach the free-arm cover, bobbin holder and needle plate.
Needle plate
Left position ( )
(#14)
Bobbin holder
Lower shaft gear
Tip of hook meets the
right side of the needle
w
w
Lowest needle position
11
3.25 – 3.55mm
Mechanical Adjustment
Adjustment of needle bar height
Before proceeding with this adjustment, check the hook timing (refer to page 11). The distance between the
upper edge of the needle eye and the tip of the hook should be in the range of 1.6 to 2.0 mm when the tip of the
hook timing meets right side of the needle in the left needle position ( ) as the needle ascends from its lowest
position.
1. Remove the needle plate, bobbin holder and face plate.
2. Turn the power switch on.
3. Select the pattern (left position). Set the zigzag width at 0.
4. Turn the handwheel toward you until the tip of hook meets the right side of the needle.
5. Loosen the hexagonal socket screw q.
6. Move the needle bar to adjust the needle bar height, and tighten the hexagonal socket screw q.
Be careful not to turn the needle bar.
7. Attach the bobbin holder, needle plate and face cover.
Needle plate
Left position ( )
(#14)
Hexagonal socket screw
Bobbin holder
Needle setting groove
Tip of hook meets the right side of the needle
Hook race
1.6 – 2.0 mm
Hook race (unit)
Upper edge of needle hole
12
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