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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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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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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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