ELNA 8300 - LEAFLET User manual

SERVICE MANUAL

&

PARTS LIST

MODEL 8300

GENERAL TROUBLE SHOOTING PROCEDURE .................................................................................2

CHANGING EXTERNAL PARTS (1) FACE COVER/TOP COVER ........................................................3

CHANGING EXTERNAL PARTS (2) BELT COVER ............................................................................... 4

CHANGING EXTERNAL PARTS (3) BASE COVER .............................................................................. 5

CHANGING EXTERNAL PARTS (4) BED COVER/BASE LID(2) ........................................................... 6

CHANGING EXTERNAL PARTS (5) BASE UNIT ................................................................................... 7

CHANGING EXTERNAL PARTS (6) FRONT COVER ........................................................................... 8

CHNAGING EXTERNAL PARTS (7) REAR COVER .............................................................................. 9

ADJUSTING NEEDLE DROP POSITION............................................................................................. 10

ADJUSTING HOOK TIMING ................................................................................................................ 11

ADJUSTING NEEDLE BAR HEIGHT ...................................................................................................12

ADJUSTING CLEARANCE BETWEEN NEEDLE AND HOOK ............................................................ 13

ADJUSTING BACKLASH BETWEEN HOOK DRIVE GEAR AND LOWER SHAFT GEAR ..........................................

14

ADJUSTING HEIGHT OF THE NEEDLE STOP POSITION................................................................. 15

ADJUSTING THREAD TENSION .........................................................................................................16

ADJUSTING TENSION RELEASE MECHANISM ................................................................................ 17

CHNAGING THREAD TENSION UNIT ................................................................................................18

REPLACING THREADER PLATE AND ADJUSTMENT ....................................................................... 19

REPLACING THREAD CUTTER .................................................................................................... 20–21

ADJUSTING HEIGHT OF EMBROIDERY FOOT P .............................................................................. 22

CONNECTOR CONNECTION DIAGRAM ............................................................................................23

REPLACING PRINTED CIRCUIT BOARD A ........................................................................................ 24

REPLACING TOUCH PANEL ............................................................................................................... 25

TOUCH SCREEN CALIBRATION ........................................................................................................26

REPLACING PRINTED CIRCUIT BOARD F ........................................................................................ 27

ADJUSTING OF THE SOLENOID .......................................................................................................28

ADJUSTING UPPER SHAFT RELEASE CAM AND CLUTCH RELEASE ARM .................................. 29

ADJUSTING THREAD CUTTER SOLENOID....................................................................................... 30

ADJUSTING THREAD CUTTER ..........................................................................................................31

ADJUSTING THREAD HOLDING SOLENOID ..................................................................................... 32

ADJUSTING THREAD DRAWING LEVER ........................................................................................... 33

ADJUSTING THE PRESSER FOOT LIFTER SENSOR ....................................................................... 34

ADJUSTING THE REMAINING BOBBIN THREAD LEVEL .................................................................35

REPLACING DC MOTOR AND MOTOR BELT TENSION ADJUSTMENT .......................................... 36

REPLACING CARRIAGE PLATE UNIT ................................................................................................37

ADJUSTING X AND Y SENSORS ........................................................................................................ 38

ADJUSTING X AND Y SENSORS (SIMPLE ADJUSTMENT) .............................................................. 39

ADJUSTING X MOTOR GEAR.............................................................................................................40

REPLACING SWITCHING POWER SUPPLY ......................................................................................41

OILING ..................................................................................................................................................42

PARTS LIST ....................................................................................................................................43–68

TABLE OF CONTENTS

1

Model 8300

Safety Precautions and Important Notes

Warning!

Disconnect the mains plug from the power outlet before making any adjustments to the

machine or replacing the parts.

Wait about 30 seconds after disconnecting the plug (capacitor discharge).

1. This service manual is intended to help with minor repairs and adjustments. The instructions do not claim to be

complete or comprehensive.

The manual does not provide guidance for complete assembly or disassembly.

2. When servicing, always use the original accessories, either those delivered with the machine or purchased

afterwards. These are the following:

Mains cable, Foot control, Buttonhole foot, Bobbin case with bobbin, other accessories.

3. Electronic parts and components may only be dispatched in their original packaging, with factory equipped

documentation.

4. This manual subject to revisions without notice. The recipients is responsible for updating the information provided

by FGAG, BERNINA, Steckborn, Switzerland.

Protection of Electrical Components

against Electrostatic Discharge

When carrying out service work on computerized machines, or when handling circuit

boards, the service technicians must be in an ESD protected environment.

1. The surface of the workbench should be conductive so that the electrostatic charges are conducted away but it

should have enough resistance to prevent short-circuiting and grounding of parts laid out on the bench.

2. The service technicians should wear wristbands connected to the bench surface. To ensure the safety of personnel,

a resistance of approx. 1 M ohm must be connected in series with the conductive wristband.

3. Electronic parts and components may only be dispatched in their original packaging, with factory equipped

documentation.

2

Model 8300

GENERAL TROUBLE SHOOTING PROCEDURE

N.G.

O.K.

N.G.

ELECTRIC QUICK CHECK

END

CORRECT IT

START

BASIC CHECK

MECHANICAL ELECTRICAL

CAN’T JUDGE

ELECTRIC QUICK CHECK

ADJUSTMENT

SEWING CHECK

REPLACE PARTS

IS NEEDLE SET OK?

IS POWER SUPPLY OK?

IS THREADING OK?

3

Model 8300

Changing External Parts (1) Face Cover / Top cover

Replacing th face cover

To remove:

1 Remove the Screw .

2 Lift the habdle up and remove the Screw .

3 Remove the top cover.

To attach:

2. Follow the above procedure in reverse.

Replacing th top cover

Top Cover

Handle

To remove:

1. Remove the Cap and Screw and remove

the Face Cover .

Cap

Screw

Face cover

To attach:

2. Follow the above procedure in reverse.

A

B

C

A

B

C

A

B

C

B

C

B

C

4

Model 8300

Changing External Parts (2) Belt Cover

Replacing the belt cover

To remove:

1. Remove the Cap and Screw .

2. Raise the Carrying Handle and remove the Screw .

3. Lay the machine on its back and remove Screws

(2 pcs. gold color), then remove the Belt cover .

Cap

Screw

Belt cover

To attach:

4. Attach the Belt Cover with Screws - .

5. Attach the Cap .

Handle

A

B

C

D

E

D

C

B

A

B D

A

B

A

E

C

D

5

Model 8300

Changing External Parts (3) Base Cover

Replacing the base cover

To remove:

1. Remove Screws (4 pieces) to remove the base

cover .

Screws

Base cover

To attach:

2. Follow the above procedure in reverse.

A

B

A

B

A

B

A

6

Model 8300

Changing External Parts (4) Bed Cover / Base Lid (2)

Replacing the bed cover

To remove:

1. Remove the base cover. (See page 5)

2. Remove Screw (2 pcs.), and remove the Base

Lid .

3. Remove Screw (2 pcs.), and remove the Bed

cover .

Screw

Base lid

Screw

Bed cover

To attach:

4. Follow the above procedure in reverse.

Replacing base Lid (2)

To remove:

1. Remove Screws (4 pieces), and remove the

Lid (2) .

Screw

Base lid (2)

To attach:

2. Follow the above procedure in reverse.

A

B

C

D

C

B

A

B

A

B

C

A

B

D

7

Model 8300

Changing External Parts (5) Base Unit

Base

To remove:

1. Remove the Belt cover. (See page 4)

2. Remove Setscrew (4 pcs.), and remove

the base unit .

3. Remove the X-Motor Connector and Y-Motor

Connector from the printed circuit board “A”.

Joint bosses

Y-motor connector (White)

X-motor connector (Blue)

To attach:

4. Attach the X, Y-Motor Connectors , into

the printed circuit board “A”.

5. Insert the X, Y-Motor Cords between the printed

cuircuit board “A” and Arm. Be sure the cords

are not caught between the Joint Bosses of

the arm and base. Tighten Screws (4 pieces)

temporarily.

Joint boss

6. Attach the Extension (Accessory) table .

Extension table (Accessory)

7. Tighten Screws while aligning the extension

table, base unit and free Arm.

Note: Attach the embroidery hoop with the template

on the carriage. Check the needle drop posi

tion against the template.

8. Attach the belt cover.

A

9

8

B

8

9

A

8

9

B

8

9

B

A

B

C

A

C

A

8

Model 8300

To remove:

1. Remove the face cover, belt cover, base cover and

top cover. (See pages 3-5).

2. Remove Screw and remove the Arm thread

guide (lower) .

3. Remove Screw .

4. Loosen Screws , 3 turns.

5. Disconnect the each connector and remove the front

cover.

Note: Disengage the Hooks to remove the Front

cover.

Screw

Arm thread guide (Lower)

Screw

Hooks (2 spots)

To attach:

6. Follow the above procedure in reverse.

Note: See pages 19 (Diagram) for Connectors

Connection.

Changing External Parts (6) Front Cover

Front cover

A

B

C

A

B

C

D E

D

E

H

E

B

A

C

D

F

9

Model 8300

Changing External Parts (7) Rear Cover

1. Remove the face cover and belt cover.

2. Loosen Screw , , , , and remove the

rear cover.

To attach:

3. Follow the above procedure in reverse.

Rear cover

To remove:

A B C D

Rear cover

Carriage

Handwheel

A

B

C

D

10

Model 8300

Adjusting Needle Drop Position

1. Lower the needle to its lowest position by turning the

handwheel.

2. Remove the face cover and loosen Screw ,

move the Needle bar supporter to the right or

left until the needle comes to the center of the

Needle plate hole .

3. Tighten the Screw .

4. Attach the face cover.

Screw

Needle bar supporter

Needle

Nedle plate hole

The needle should be positioned at the center of the needle plate hole.

A

B

C

D

A

B

C

D

A

B

A

C

D

11

Model 8300

Adjusting Hook Timing

The hook timing is that amount of ascending travel of the needle bar from its lowest

position to where the tip of the rotary hook meets the right side of the needle should be

1.65 to 1.95 mm.

1. Remove the belt cover, bed cover, base cover, base

lid (1) and base lid (2).

2. Remove the presser foot, Needle plate and

Bobbin holder .

3. Lower the needle bar at its lowest position by

turning the handwheel toward you.

4. Raise the needle bar 1.8 mm up from the lowest

position.

5. Loosen the Screws of lower shaft gear, turn the

Lower shaft gear until the tip of rotary hook

meets with the right side of the Needle .

Tighten screw (2 pieces) of the lower shaft

gear.

6. Attach the Bobbin holder, Needle plate, presser foot

and Needle.

7. Attach the base lid (2), base lid (1) base cover, bed

cover and belt cover.

1.65 - 1.95 mm

A

B

A

B

D

C

D

E

C

Needle

12

Model 8300

Adjusting Needle Bar Height

1. Remove the presser foot, Needle plate and

Bobbin holder .

2. Remove the face cover.

3. Turn the handwheel to raise the needle bar from

the lowest position until the tip of the rotary hook

meets with the right side of the needle .

Turn the handwheel to raise the needle bar further

1.8 mm.

4. Loosen the Setscrew.

5. Move the Needle bar up or down to align the

Top of the needle eye with the Upper surface

of the hook race .

6. Tighten the Screw. Be sure that the Groove

on the needle bar is facing right in the front.

7. Attach the Bobbin holder , Needle plate and

presser foot.

8. Attach the face cover.

Needle

3.2 - 3.6 mm

Top of the needle eye

Hook race body

The standard distance between the top of the needle eye and the upper surface of the hook

race should be in the range of 3.2 - 3.6 mm when the rotary hook meets the right side of the

needle in ascending travel of needle from its lowest position.

Setscrew

A

B

C

D

C

D

E

F

G

H

B

A

B

Upper surface of hook race

13

Model 8300

Adjusting Clearance between Needle and Hook

The clearance between needle and rotary hook should be - 0.1 to + 0.05 mm.

1. Remove the needle plate, bobbin holder, base cover

and bed cover (See pages 5 - 6).

Replace the needle with the Test pin .

2. Loosen Screws , , temporarily and retighten

Screw slightly.

3. Turn the handwheel to bring the tip of the rotary hook

behind the test pin .

4. Adjust the clearance between the test pin

and the Tip of rotary hook to - 0.1 to + 0.05mm

by moving the Rotary hook set plate up or down.

Tighten the Screws , , firmly.

5. Check the rotary hook driver gear and the lower shaft

gear backlash.

If gears mesh or engage tightly or loosely, check

“Adjusting Backlash between Hook Drive Gear and

Lower Shaft Gear”. (See page 14)

Note: Do not move the rotary hook set plate in a lateral

direction, otherwise the hook timing will change.

6. Reattach the needle.

Reattach the bed cover, base cover, base lid, bobbin

holder, needle plate and needle.

A

B

C

B

D

E

G

A

B

C

A

B

C

F

D

G

D

E

F

D

14

Model 8300

Adjusting Backlash between Hook Drive Gear and Lower

Shaft Gear

The rotary play of the hook should be 0.8 mm or less.

Adjust the backlash after the adjustment of the clearance between needle and rotary hook.

To check:

1. Turn the power switch “OFF”.

2. Remove the base cover, bed cover, needle plate

and bobbin holder.

3. Jog the hook race with fingers to check the rotary

play.

“If the play is larger than 0.8 mm or the gears do not

turn smoothly, adjust the backlash as follows”.

Adjustment procedure:

1. Remove the bed cover (See page 4) and loosen the

Screw .

2. Turn the Lower shaft bushing (Eccentric), in the

direction “B” when the play at shuttle hook tip is too

small.

3. Turn the Lower shaft bushing (Eccentric), in the

direction “A” when the play at shuttle hook is too large.

4. Tighten Screw securely after adjustment.

Note: Do not move the lower shaft bushing in a lateral

direction, otherwise the torque of thelower shaft will

change.

Reference point

A

B

A

The rotary hook play

should be 0.8 mm or

less.

15

Model 8300

Adjusting Height of the Needle Stop Position

The standard height of needle stop position should be 14.2 mm above the needle plate

surface when the machine is topped.

1. Remove the top cover unit. (See page 3)

2. Turn the power switch “ON” and press Start / Stop

button twice.

Stop the machine with the needle in the up position.

3. (A) If the needle stops higher than 14.2 mm ,

loosen Screw and turn the Upper shaft

shield plate in the direction of (A).

(B) If the needle stops lower than 14.2 mm ,

loosen Screw and turn the Upper shaft

shield plate in the direction of (B).

4. Place the right side of the Upper shaft shield plate

in the center of the slit of the Upper shaft sensor

and tighten Setcrew .

5. Press the Start/Stop button twice to check the height

of the needle stop position.

6. Attach the top cover.

Needle #11

C

A

B

C

A

B

D

A

C

A

D

B

(A)

(B)

16

Model 8300

Adjusting Thread Tension

Upper Thrtead Tension:

The standard upper thread tension should be 51 to 59 grams when the tension dial

is set at “3”, measured with a #50 polyester thread being pulled at approximately 110

mm/sec. in the direction of arrow.

polyester sewing thread

#50 (White)

(A)

(B)

1. Set the tension dial at " 3 ".

2. Lower the presser foot.

3. Remove the face cover unit (See P. 3).

3. If the thread tension is more than 59g, turn the lead screw

in the direction (B).

4. If the thread tension is less than 51g, turn the lead screw

in the direction (A).

(C) Pulling direction: (Pulling speed 110 mm/ Sec.)

(C)

Bobbin Thread Tension:

The standard bobbin thread tension should be 9 to 11 grams measured with a #50 polyester

thread being pulled at approximately 50 mm/sec. in the direction of arrow.

Adjust the bobbin thread tension by turning the

adjusting screw .

(A) If the thread tension is more than 11 g

........turn the screw in the direction of “A”.

(B) If the thread tension is less than 9 g

........turn the screw in the direction of “B”

Pulling direction: (Pulling speed 50 mm/ Sec.)

(A)

(B)

1

2

1

2

17

Model 8300

Adjusting Tension Release Mechanism

When the presser foot lifter is raised, the tension disks should open approximately 1.0

mm. When the presser foot lifter is lowered, the tension disks should close and the

tension release plate (2) should be free from tension.

1. Remove the top cover unit. (see page 3)

2. Lower the presser foot lifter, set the thread tension dial

at “9” and loosen the Screw .

3. While pushing the tension release plate (1) in direction

B, press the tension release plate (2) to disk holder,

tighten the Screw .

4. Raise the presser foot lifter, turn the thread tension

dial at “9” to “0”, make sure the tension disks

should open 1.0 mm at any dial setting.

5. Lower the presser foot lifter, turn the thread tension

dial “9” to “0”, make sure the tension disks does not move.

6. Attach the top cover.

Tension release plate (2)

Tension release plate (1)

Disk holder

B

A

B

18

Model 8300

Changing Thread Tension Unit

Replacing the thread tension unit

To remove:

1. Remove the front cover unit. see page 8)

2. Remove Screws and .

3. Remove the thread tension unit.

To attach:

3. Follow the above procedure in reverse.

Note: After the replacement, adjust “Thread Tension

Release Machanism” and Solenoid.

A B

A

B

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ELNA 8300 - LEAFLET User manual

ELNA 8300 - LEAFLET User manual

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