ELNA 9900 - LEAFLET User manual

SERVICE MANUAL
9900

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elna 9900
CONTENTS
Replacing the Spool Stand...........................................................................................4
Replacing the Tension Unit Cover ................................................................................4
Replacing the Static head cover (Right).......................................................................5
To Replace Right Cover and Left Cover.......................................................................6
Replacing the Base Cover and Bed Cover ..................................................................7
Checking the Thread Paths (1) ....................................................................................8
Checking the Thread Paths (2) ....................................................................................9
Replacing the Needle ................................................................................................. 10
Needle and Thread Reference Table ......................................................................... 11
Checking the Lowest Position of the Needle.............................................................. 12
Replacing the Needle Bar Rest .................................................................................. 13
Replacing the Take-up Lever Cam Roller .................................................................. 14
Adjusting the Take up Lever Timing ........................................................................... 15
Replacing and Adjusting the Presser Foot (1)............................................................ 16
Replacing and Adjusting the Presser Foot (2)............................................................ 17
Replacing the Thread Catcher Unit ............................................................................ 18
Replacing the Thread Catcher Hook .......................................................................... 19
Replacing the Jump Solenoid .................................................................................... 20

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elna 9900
Adjusting a Play in the Moving Head ......................................................................... 21
Replacing the Moving Head (1).................................................................................. 22
Replacing the Moving Head (2).................................................................................. 23
Adjusting the Needle Drop Position (Back or Forth) .................................................. 24
Adjusting the Needle Height....................................................................................... 25
Replacing the Needle Bar, Needle Spring and Cushion ............................................ 26
Replacing the Rotation Stopper Plate ........................................................................ 27
Replacing the Thread Take-up Lever ......................................................................... 28
Adjusting the Check Spring Tension .......................................................................... 29
Adjusting the Check Spring Stroke ............................................................................ 30
Adjusting the Thread Catcher Holder ......................................................................... 31
Replacing the Thread Catcher Loop Tape ................................................................. 32
Replacing the Lateral Moving Unit ............................................................................. 33
Adjust the Hook Timing .............................................................................................. 34
Adjusting the Position of the Hook Stopper................................................................ 35
Replacing the Thread Cutter Driving Roller ............................................................... 36
Replacing the Dynamic Cutter Blade ......................................................................... 37
Replacing the Static Cutter Blade .............................................................................. 38
CONTENTS

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elna 9900
Adjusting the Static Cutter Blade ............................................................................... 39
Adjusting the Dynamic Cutter Blade .......................................................................... 40
Adjusting the Bobbin Thread Holder .......................................................................... 41
Adjusting the Thread Keeper ..................................................................................... 42
Adjusting the X-carriage Belt Tension ........................................................................ 43
Replacing the X-carrige Belt ...................................................................................... 44
Adjusting the Y-carriage Belt Tension ......................................................................... 45
Replacing the Y-carrige Belt ....................................................................................... 46
Adjusting the Timing Belt Tnsion ................................................................................ 47
Replacing the Timing Belt .......................................................................................... 48
Adjusting the Motor Belt Tension ................................................................................ 49
Replacing the Motor Belt ............................................................................................ 50
Replacing the DC Motor ............................................................................................. 51
Adjusting the Needle Upper Shaft Timing .................................................................. 52
Adjusting the Moving Head Stop Position .................................................................. 53
Adjusting the Needlr Stop Position............................................................................. 54
Adjusting the Carriage Home Position (1) .................................................................. 55
Adjusting the Carriage Home Position (2) .................................................................. 56
Parts List .............................................................................................................. 57-100
CONTENTS

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elna 9900
Replacing the Tension Unit Cover
Setscrews
Spool stand
Tension unit cover
To remove:
1. Remove the 3 setscrews and spool stand.
To attach:
2. Attach the spool stand and tighten the 3
setscrws.
Setscrews
Replacing the Spool Stand
To remove:
1. Remove the 2 setscrews and tension unit cover.
To attach:
2. Attach the tension unit cover and tighten the 2
setscrws.

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elna 9900
To remove:
1. Loosen the RCS mounting arm knob and
remove it.
2. Remove 2 caps, and 2 setscrews (A). Remove
the static head cover (right).
3. Disconnect the LED lamp connector and
K-board connector.
To attach:
4. Connect the LED lamp connector and K-board
connector.
5. Attach the static head cover (right) with the 2
setscrews (A) while pulling the cover to the
back of the machine. Attach the 2 caps.
6. Attach the RCS mounting arm knob.
Replacing the Static Head Cover (Right)
RCS mounting arm knob
Caps, Setscrews (A)
Hooks
LED lamp connector
K-board connector

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elna 9900
Hook
Upper hook 1
Static head cover (right)
Right Cover
To remove:
1. Remove the static head cover (right).
Unhook the right cover from the right hook.
• To remove the static head cover (right), Unhook
the cover from upper hook 1, upper hook 2 and
the hook on handwheel side.
2. Remove 3 caps and 3 setscrews A.
Remove the right cover while pulling the right
bottom part toward you and lift.
To attach:
3. Attach the right cover with 3 setscrews A and 3 caps.
4. Attach the static head cover (right).
• Do not get cords caught when attaching the
static head cover (right).
Left Cover
To remove:
1. Remove 4 caps and 4 setscrews B.
Remove the left cover.
Disconnect the connectors.
To attach:
2. Connect the connectors.
Attach the left cover with 4 setscrews B and 4
caps.
Caps, Setscrews A
Caps, Setscrews B
To Replace Right Cover and Left Cover
Upper hook 2

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elna 9900
Base Cover
To remove:
1. Remove the 6 setscrews A.
2. Lift the back of the machine and pull out
the base cover (support the back of the machine
with a crosstie).
To attach:
3. Attach the machine into the base cover.
4. Tighten the 6 setscrews A securely.
Replacing the Base Cover and Bed Cover
Bed Cover
To remove:
1. Remove the setscrews A. Remove the bed
cover.
To attach:
2. Attach the bed cover with the setscrews A.
Setscrews A
Setscrews A
Base cover
Bed cover

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elna 9900
A
Detectig roller
To avoid seam puckering, skipped stitches or
thread breaking, keep the thread paths in the best
condition (free from burr, scratch, rust etc.).
1. Tension control, detecting roller
a) Detecting rollers should spin smoothly.
b) Tension controls and detecting rollers
should be free of lint or dust.
2. Thread guide hole
a) There should be no burrs or scratches.
3. Thread take-up lever
a) There should be no burrs or scratches.
4. Lower guide plate
a) There should be no burrs or scratches.
5. Needle
a) The needle should not be bent or blunt.
To check the needle:
Place and slide the tip of the needle on your
nail to check if there is any nick or chip.
Replace the needle if it marks a scratch on your
nail.
Place the needle onto something flat (needle
plate, glass, etc.). The gap (A) between the
needle and the flat surface should be consis-
tent.
Replace the needle if the gap is not consistent.
Checking the Thread Paths (1)

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elna 9900
6. Needle plate
a) There should be no burrs or scratches.
7. Presser foot
a) There should be no burrs or scratches,
especially inside of the presser foot hole.
b) There should be no warp in the presser foot.
8. Hook race
a) There should be no burrs or scratches.
b) The tip of hook race should not be blunt.
c) There should be no detectable play in the
hook and hook race.
9. Thread keeper
a) There should be no burrs or scratches,
especially on the tip of the thread keeper.
10. Check spring
a) The check spring should not be worn.
Checking the Thread Paths (2)
Upper side
Lower side
Hook
Thread keeper
Presser foot
Check spring

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elna 9900
Replacing the Needle
To remove:
1. Loosen the needle clamp screw.
2. Remove the needle.
To attach:
3. Insert the needle into the needle clamp with the
long groove facing you. Push the needle up as
far as it will go.
4. Tighten the needle clamp screw.
Needle clamp screw
Needle
Long groove

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elna 9900
Needle and Thread Reference Table
Use DBxK5Q1NY needles and select an appropriate
size of needle for threads and fabrics to be sewn.
An inappropriate size of needle may cause skip
stitches, thread breakage or thread looping.
Please refer to the table below and select the
suitable needle size.
75 8~10
120 9~11
200 11~14
Thread Size (Denier)
Polyester
Needle Size

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elna 9900
Checking the Lowest Position of the Needle
1. Remove the spool stand, static head cover
(right) and left cover.
2. Turn the handwheel to set the index disk at
270°.
3. Push the needle bar down to engage the
needle bar clutch.
4. Turn the handwheel to set the needle bar at its
lowest position.
Use a lever type dial indicator to measure the
needle bar height.
5. Turn the handwheel clockwise until the indicator
reads 0.2 mm and read the angle (Aº) of the
index disk.
Turn the handwheel counterclockwise until the
indicator reads 0.2 mm and read the angle (Bº)
of the index disk.
Calculate the mean angle (Cº): C=(A+B–360)÷2
Turn the handwheel clockwise to set the index
disk at Cº.
Loosen the 2 setscrews and set the pointer at
0º (L). Tighten the 2 setscrews securely.
Check the following items if you have adjusted
the lowest position of the needle.
• Upper shaft timing
• Take-up lever timing
• Hook timing
• Thread cutter timing
Lever type dial indicator
Setscrews
Pointer

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elna 9900
Replacing the Needle Bar Rest
To remove:
1. Remove the spool stand, static head cover
(right), right cover and left cover.
2. Disconnect the thread catcher unit connector.
Remove the 3 setscrews (A). Remove the
thread catcher unit.
Remove the moving head (see pages 22, 23).
3. Loosen the setscrew (B). Pull the needle bar
main shaft up and remove it from the machine.
4. Loosen the setscrew (C) and remove the
needle bar rest from the needle bar main shaft.
To attach:
5. Reverse the procedure above. Attach the
needle bar main shaft so its bottom end is level
with the bottom surface of the head frame.
6. Adjust the needle height after the replacement.
Setscrews (A) Connector
Needle bar main shaft
Setscrew (B)
Needle bar rest Setscrew (C)
Bottom of the head frame

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elna 9900
To remove:
1. Remove the spool stand, static head cover
(right), right cover, left cover and thread tension
panel.
2. Remove the 3 setscrews and drive cover.
3. Remove the thread take-up lever spring with
pliers.
4. Loosen the setscrew. Remove the thread take-
up lever shaft, thread take-up lever unit and
washer.
5. Loosen the setscrew. Remove the cam roller
shaft and cam roller.
To attach:
6. Reverse the procedure above.
When attaching the thread take-up lever shaft,
tighten the screw while pressing the thread
take-up lever shaft lightly.
Drive cover Setscrews Connector
Thread take-up lever spring
Setscrew
Thread take-up lever shaft Thread take-up
lever unit
Cam roller
Cam roller
shaft
Setscrew
Washer
Thread take-up
lever shaft
Replacing the Take-up Lever Cam Roller

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elna 9900
Adjusting the Take-up Lever Timing
To remove:
1. Remove the spool stand, static head cover
(right), right cover and left cover.
2. Turn the handwheel to set the index disk at 6º.
3. Insert the positioning pin from the left side of
the arm.
The positioning pin goes into the pin groove of
take-up lever cam if the timing is correctly
adjusted.
4. If the timing is incorrect, loosen the setscrew on
the cam clamp and turn the take-up lever cam
so the positioning pin can go into the pin grove
on the cam.
Turn the handwheel to set the index disk at 6º.
Tighten the setscrew on the cam clamp while
pressing the take-up lever cam to the side of
the moving head. There should be no gap
between the take-up lever cam and cam clamp.
5. Pull the positioning pin out from the arm.
Turn the handwheel to set the index disk at
270º.
Attach the removed parts.
Positioning pin
Pin groove
Take-up lever cam
Setscrew
Cam clamp
Take-up lever cam
Cam clamp

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elna 9900
Replacing and Adjusting the Presser Foot (1)
1. Remove the lower thread guide plate unit and
thread catcher panel.
2. Loosen the needle clamp screw and the setscrew.
Remove the needle, needle clamp and two
needle clamp cushions.
NOTE:
The presser foot will spring down when the needle
clamp is removed.
3. Remove the setscrew and replace the presser
foot.
4. Attach the needle, needle clamp and needle
clamp cushions. Tighten the needle clamp
screw and setscrew.
5. Adjust the needle height. (see To Adjust the
Needle Height)
6. Push the needle bar down to engage the
needle bar clutch.
Needle clamp
cushion
Needle clamp
screw
Setscrew
Presser foot
Setscrew
Needle clamp

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elna 9900
Replacing and Adjusting the Presser Foot (2)
7. Turn the handwheel to set the index disk at 0º (L).
8. Insert the 1.2 mm thick gauge between the
needle plate and the presser foot.
9. Tighten the setscrew.
10.Turn the handwheel to reset the index disk at
270º.
11.Attach the removed parts.
Setscrew

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elna 9900
Replacing the Thread Catcher Unit
To remove:
1. Remove spool stand, head cover (right), right
cover, left cover, moving head and lateral
moving unit.
2. Disconnect the thread catcher connector.
Remove the 3 setscrews (A), the thread
catcher.
To attach:
3. Connect the thread catcher connector.
Tighten the setscrews (A) while pressing the
thread catcher unit in the direction of arrows as
illustrated.
4. Adjust the thread catcher (see page 31).
5. Attach removed parts.
Setscrews (A) Connector

elna 9900
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Replacing the Thread Catcher Hook
To remove:
1. Remove the thread catcher unit (see page 18).
2. Loosen the 6 setscrews and remove the thread
catcher guide.
3. Remove the thread catcher hook screw.
Remove the thread catcher hook.
To attach:
4. Attach the thread catcher hook with the thread
catcher hook screw.
5. Attach the thread catcher guide with the 6
setscrews.
6. Attach the thread catcher unit (see page 18).
Setscrews
Thread catcher hook screw
Thread catcher hook
Thread catcher guide