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.
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
Screw
Screw
Belt cover
To attach:
4. Attach the Belt Cover with Screws - .
5. Attach the Cap .
Handle
A
B
C
D
E
E
D
C
B
A
B D
A
B
A
E
C
D
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
A
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
A
B
B
A
A
B
C
A
A
A
B
D
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
A
8
9
B
8
9
B
A
B
C
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
Screw
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
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
D
C
C
C
D
D
E
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
E
F
F
G
G
H
H
B
A
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
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
B
B
A
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
A
A
B
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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