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SERVICE MANUAL
&
PARTS LIST
MODEL 8300
TABLE OF CONTENTS
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 .................................................................................................... 2021
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 .................................................................................................................................... 4368
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.
1
Model 8300
GENERAL TROUBLE SHOOTING PROCEDURE
START
IS NEEDLE SET OK?
BASIC CHECK IS POWER SUPPLY OK?
IS THREADING OK?
N.G.
O.K.
CORRECT IT
MECHANICAL ELECTRICAL CAN'T JUDGE
O.K.
ELECTRIC QUICK CHECK
N.G.
ADJUSTMENT
REPLACE PARTS
SEWING CHECK
ELECTRIC QUICK CHECK
END
2
Model 8300
Changing External Parts (1) Face Cover / Top cover
C
Replacing th face cover
To remove:
1. Remove the Cap A and Screw B and remove
the Face Cover C .
A Cap
B Screw
C Face cover
To attach:
2. Follow the above procedure in reverse.
B A
Top Cover
Replacing th top cover
To remove:
1 Remove the Screw B .
2 Lift the habdle up and remove the Screw C .
3 Remove the top cover.
To attach:
2. Follow the above procedure in reverse.
B
C
Handle
3
Model 8300
Changing External Parts (2) Belt Cover
Replacing the belt cover
To remove:
1. Remove the Cap A and Screw B .
2. Raise the Carrying Handle and remove the Screw C .
3. Lay the machine on its back and remove Screws D
(2 pcs. gold color), then remove the Belt cover E .
A Cap
B Screw
C Screw
D Screw
E Belt cover
To attach:
B 4. Attach the Belt Cover with Screws B - D .
E A
5. Attach the Cap A .
C
Handle
D
D
4
Model 8300
Changing External Parts (3) Base Cover
Replacing the base cover
To remove:
1. Remove Screws A (4 pieces) to remove the base
cover B .
A Screws
B Base cover
To attach:
2. Follow the above procedure in reverse.
A A
B
A A
5
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 A (2 pcs.), and remove the Base
Lid B .
3. Remove Screw C (2 pcs.), and remove the Bed
cover D .
A Screw
B Base lid
C Screw
C D Bed cover
D A
B To attach:
4. Follow the above procedure in reverse.
Replacing base Lid (2)
To remove:
1. Remove Screws A (4 pieces), and remove the
Lid (2) B .
A
A Screw
B Base lid (2)
To attach:
2. Follow the above procedure in reverse.
A
A
B
6
Model 8300
Changing External Parts (5) Base Unit
Base
A
To remove:
1. Remove the Belt cover. (See page 4)
2. Remove Setscrew A (4 pcs.), and remove
the base unit .
3. Remove the X-Motor Connector 9 and Y-Motor
Connector 8 from the printed circuit board "A".
B Joint bosses
8 Y-motor connector (White)
9 X-motor connector (Blue)
A
9 8
To attach:
4. Attach the X, Y-Motor Connectors 8 , 9 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 B of
B the arm and base. Tighten Screws A (4 pieces)
temporarily.
B Joint boss
C
6. Attach the Extension (Accessory) table C .
C Extension table (Accessory)
7. Tighten Screws A 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
7
Model 8300
Changing External Parts (6) Front Cover
Front cover
To remove:
B
1. Remove the face cover, belt cover, base cover and
top cover. (See pages 3-5).
A H 2. Remove Screw A and remove the Arm thread
guide (lower) B .
3. Remove Screw C .
4. Loosen Screws D , E 3 turns.
5. Disconnect the each connector and remove the front
cover.
Note: Disengage the Hooks H to remove the Front
cover.
A Screw
B Arm thread guide (Lower)
C
C Screw
D Screw
E Screw
D F Hooks (2 spots)
To attach:
6. Follow the above procedure in reverse.
Note: See pages 19 (Diagram) for Connectors
Connection.
E
8
Model 8300
Changing External Parts (7) Rear Cover
Rear cover
To remove:
1. Remove the face cover and belt cover.
2. Loosen Screw A , B , C , D , and remove the
rear cover.
A
To attach:
3. Follow the above procedure in reverse.
B
Carriage
Rear cover
C
D
Handwheel
9
Model 8300
Adjusting Needle Drop Position
The needle should be positioned at the center of the needle plate hole.
1. Lower the needle to its lowest position by turning the
A handwheel.
2. Remove the face cover and loosen Screw A ,
move the Needle bar supporter B to the right or
left until the needle C comes to the center of the
Needle plate hole D .
B 3. Tighten the Screw A .
4. Attach the face cover.
A Screw
B Needle bar supporter
C C Needle
D Nedle plate hole
D
10
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).
A
2. Remove the presser foot, Needle plate A and
B Bobbin holder B .
3. Lower the needle bar at its lowest position D by
turning the handwheel toward you.
4. Raise the needle bar 1.8 mm up from the lowest
C position.
5. Loosen the Screws C of lower shaft gear, turn the
Lower shaft gear D until the tip of rotary hook
meets with the right side of the NeedleE .
Tighten screw (2 pieces) C of the lower shaft
gear.
6. Attach the Bobbin holder, Needle plate, presser foot
and Needle.
D C 7. Attach the base lid (2), base lid (1) base cover, bed
cover and belt cover.
Needle
E
1.65 - 1.95 mm
D
11
Model 8300
Adjusting Needle Bar Height
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.
1. Remove the presser foot, Needle plate A and
A
Bobbin holder B .
B 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 C
meets with the right side of the needle D .
Turn the handwheel to raise the needle bar further
1.8 mm.
4. Loosen the Setscrew.
5. Move the Needle bar E up or down to align the
Setscrew
Top of the needle eye F with the Upper surface
of the hook race G .
E 6. Tighten the Screw. Be sure that the Groove H
on the needle bar is facing right in the front.
7. Attach the Bobbin holder B , Needle plate A and
presser foot.
H 8. Attach the face cover.
F G
Needle D
C
Upper surface of hook race
3.2 - 3.6 mm
Top of the needle eye
Hook race body
12
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).
A B
Replace the needle with the Test pin D .
2. Loosen Screws A , B , C temporarily and retighten
Screw B slightly.
3. Turn the handwheel to bring the tip of the rotary hook
behind the test pin D .
4. Adjust the clearance between the test pin D
and the Tip of rotary hook E to - 0.1 to + 0.05mm F
G C by moving the Rotary hook set plate G up or down.
Tighten the Screws A , B , C 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)
D
Note: Do not move the rotary hook set plate in a lateral
direction, otherwise the hook timing will change.
E
F 6. Reattach the needle.
D Reattach the bed cover, base cover, base lid, bobbin
holder, needle plate and needle.
13
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.
B
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 A .
A
2. Turn the Lower shaft bushing B (Eccentric), in the
direction "B" when the play at shuttle hook tip is too
small.
Reference point
3. Turn the Lower shaft bushing B (Eccentric), in the
direction "A" when the play at shuttle hook is too large.
4. Tighten Screw A securely after adjustment.
Note: Do not move the lower shaft bushing in a lateral
direction, otherwise the torque of thelower shaft will
change.
The rotary hook play
should be 0.8 mm or
less.
14
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.
Needle #11
3. (A) If the needle stops higher than 14.2 mm C ,
loosen Screw A and turn the Upper shaft
C shield plate B in the direction of (A).
(B) If the needle stops lower than 14.2 mm C ,
loosen Screw A and turn the Upper shaft
shield plate B in the direction of (B).
4. Place the right side of the Upper shaft shield plate
B A in the center of the slit of the Upper shaft sensor D
and tighten Setcrew A .
(A)
5. Press the Start/Stop button twice to check the height
of the needle stop position.
6. Attach the top cover.
(B)
D
15
Model 8300
Adjusting Thread Tension
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 1 .
1 (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"
2 Pulling direction: (Pulling speed 50 mm/ Sec.)
(A) (B)
2
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 (C) 1. Set the tension dial at " 3 ".
#50 (White) 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
(A)
in the direction (A).
(C) Pulling direction: (Pulling speed 110 mm/ Sec.)
(B)
16
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)
Tension release plate (1)
B 2. Lower the presser foot lifter, set the thread tension dial
A at "9" and loosen the Screw A .
3. While pushing the tension release plate (1) in direction
B, press the tension release plate (2) to disk holder,
tighten the Screw A .
Disk holder 4. Raise the presser foot lifter, turn the thread tension
dial at "9" to "0", make sure the tension disks B
should open 1.0 mm at any dial setting.
B
Tension release plate (2) 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.
17
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 A and B .
3. Remove the thread tension unit.
To attach:
A 3. Follow the above procedure in reverse.
Note: After the replacement, adjust "Thread Tension
Release Machanism" and Solenoid.
B
18
Model 8300
Replacing Threader Plate and Adjustment
If the hook on the threader plate is damaged, replace it by following the instructions below.
To replace (Fig. 1):
1. Remove the presser foot.
2. Push down the Threader supporter plate A to
remove from the Pin B . (Fig. 1)
3. To attach the threader supporter plate, match the
groove of the Threader supporter plate A with the
pin B ,and then push it up to insert.
A Threader supporter plate
B Pin
Fig. 1
C Hook
C
B
A
If the hook on the threader plate is not aligned with needle eys, adjust it by following the
instructions below.
Fig. 2
A
(X) Adjusting threader plate position (Fig. 2):
1. When the Hook C is slightly touching the needle
eye, loosen Screw D and adjust the Threader plate
as shown.
View-X
D If the hook position is too high or too low (Fig. 3):
1. Remove the face cover.
Fig. 3 2. If the hook is too high, loosen the Screw E and
lower the Setting position plate F .
F If the hook is too low, loosen Screw E to slide up
the Setting position plate F .
E
19
Model 8300
Replacing thread cutter
To replace the thread cutter, follow the procedure below.
Screw (A) Free arm cover To remove:
1. Remove the needle plate and the bed cover.
2. Loosen the screw (A). Remove the free-arm cover.
3 Remove setscrews(B), then remove the thread
cutter (unit).
To attach:
Insert the pin (C) and pin (E) into the thread cutter hole,
and attach the thread cutter unit with the screw (B).
Cutter slide Pin (C) Screw (B)
plate
After attaching the thread cutter unit, check the driving
arm (1) function.
1. Lower the needle bar at its lowest position by turning
the handwheel.
2. Push the driving arm (1) down and insert the pin (D)
into the ditch of the cutter driving cam.
3. Turn the handwheel to drive the cutter slide plate.
The driving arm (1) should disengage from the
Thread cutter Hole (F) Screw (B) stopper and return to the home position.
(unit)
Pin (E) Pin (C)
Driving arm (1)
Pin (D) Ditch of cutter driving cam
20
Model 8300
Replacing thread cutter
To check thread cutter function
To check:
Gothic AB
B
1. Select monogramming.
A B C D E F G H
2. Select letter size "S".
I J K L M N O P 1
Q R S T U V W X
3 3. Press "I" 10 times. Press OK key.
Y Z
A A
a A Font 4. Press "Color change" key.
AB LM Edit
Mode
AB
S
2 3
2
4 5. Set the hoop and start sewing.
The thread should be cut automatically each time
A(F):126x110mm
after letter "I" is finished.
4
Jog
Mode ST
21
Model 8300
Adjusting Height of Embroidery Foot P
Attach the Foot (P), and the space between the needle plate and the bottom surface of the
Foot (P) should be 1.0 to 1.6 mm, when the needle bar is at its lowest position.
1. Remove the face plate and top cover unit.
(See page 3)
E
2. Remove the face plate unit. (See page 3)
3. Lower the Needle A and lower the presser foot lifter.
4. Insert the 1.2 mm Feeler gauge B between
the Embroidery Foot (P) C and the Needle plate D .
5. While pressing the Presser bar actuator E down
against the upper shaft cam, loosen the Screw
and push it down in the direction of arrow, then
tighten Screw F again.
6. Reattach the face plate and top cover.
F
C
B
D
A
22
Model 8300
Connector Connection Diagram
Please see the following connector connection diagram for the printed circuit board A.
1 2 3 4
5
6
7
8
19
9
18
17 16 15 14 13 12 11 10
1 Touch panel 11 Y- Motor (White)
2 LCD Harness 12 Thread cutter switch (Black)
3 Presser foot lifter sensor (Red) 13 Thread cutter solenoid (Red)
4 Thread detection sensor ( Red ) 14 Solenoid for thread tension (Red)
5 Bobbin winder sensor (Black) 15 Remaining bobbin thread solenoid (Blue)
6 Upper shaft sensor (Black) 16 Lamp (White)
7 Printed circuit board F (Black) 17 Needle thread solenoid (White)
8 Remaining bobbin thread sensor (Blue) 18 Inverter (White)
9 Switching power supply ( White ) 19 DC Motor (White)
10 X- Motor ( Blue )
23
Model 8300
Replacing Printed Circuit Board A
1 2 1
To remove:
1 Remove the front cover. (See page 8)
2 Pull out the connectors of printed circuit board F
LCD Harness, Inverter and Touch panel.
3 Remove Screws (6 pcs.) 1 and the Printed
circuit board A 2 with the Card guide 3 .
To attach:
4 Follow the above procedure in reverse.
1 Setscrew
2 Printed circuit board A
3 Card guide
3 1 1
24
Model 8300
Replacing Touch Panel
1
(F)
2
2 To remove:
(C) (B) 1 Remove the front cover. (See page 8)
2 Pull out the Connectors of printed circuit board
(G) F 6 , LCD Harness 5 and Inverter connector
8 and Touch panel connectors 7 .
(A)
3 Remove Screws 2 (4 pieces) and remove the
Touch panel 8 .
(E)
2 2
(D)
3
To attach:
4 Place the Touch panel 7 and press it against the
4
Ribs (A), (B), (C).
Fix the Touch panel 7 with the Fixing plate
(bottom) 3 while press it against the Touch panel
7 and tighten screws 2 .
5 Place the Fixing plate (top) 1 and secure it with
Screws 2 while pressing the Fixing plate (top) 1
against the Touch panel 7 .
5
1 Fixing plate (Top
2 Screw
6 3 Fixing plate (Bottom)
4 Touch panel connector
5 LCD Harness
6 Printed circuit board F
7 7 Touch panel
8 Inverter
8
25
Model 8300
Touch Screen Calibration
Adjust the key position of the touch screen after replacing the touch panel, or if the key
position is out of alignment.
A Note: Do not press any key other than those described in
the following sections. These keys are not for servicing
B
but for factory use only.
1. Turn the Power switch A on while pressing the Start/
Stop button B . Do not release the button until the
LCD screen shows the adjusting mode.
A Power switch
B Start/Stop button
Main C
Slave DC1 2. The LCD screen will show the Adjusting mode C .
C Adjusting mode
Brightness Foot UD Sensor Off
Card / USB PH Sensor Aging 3. Press the Start/Stop button again.
Solenoid Solenoid Hold Caution: Do not press any keys in this mode.
Bobbin BobbinCheck
4. The LCD screen will show the Special adjusting
mode D .
D Special adjusting mode
5. Press the "TTP Adjust" key.
Caution: Do not press the "Self Check" or "Clear Set"
key, which are only for the factory use.
6. Press the cross with the tip of the extra spool pin, from
steps 1 to 5 in this order.
7. Having pressed the last (5th) key, the LCD screen
D shows "ADJUSTMENT END" and "OK".
TTP Adjust
8. Turn the power switch off.
Self Check
9. Turn the power switch on again to check the adjustment
Clear Set
result.
PRESS MARK 4 ADJUSTMENT END Caution: Pressing the "Clear Set"
key will erase all the program
1 settings.
2 OK
Note: Do not press the "Self Check"
3
key which is not for servicing but for
5 factory use only.
26
Model 8300
Replacing Printed Circuit Board "F"
To remove:
A B 1. Remove the front cover. (See page 8)
2. Pull out the connector 12 from the printed circuit
board "A" (Mainboard) (See page 25).
3. Remove Screws A (2 pieces) and remove
the Printed circuit board "F" (Start/Stop) B .
To attach:
4. Follow the above procedure in reverse.
A
27
Model 8300
Adjustment of the Solenoid
A
1. Remove the top cover. (see page 3)
2. Loosen the setscrews A .
3. Adjust the clearance of Solenoid 1.6 mm B with the
tension disk closed.
4. Tighten the setscrew A .
The plunger is drawn
B 1.6mm
in direction of Arrow
To check:
1. Turn the power switch on while pressing the Start/
Stop button. Do not release the button until the LCD
screen shows the adjusting mode.
2. Press the "Solenoid" key.
3. Lower the presser foot lifter and make sure the
disk holder shut and open automatically when
Main
Slave DC1
press the keys.
Brightness Foot UD Sensor Off
4. Press the OK key.
Card / USB PH Sensor Aging
Solenoid Solenoid Hold 5. Turn the power off.
Bobbin BobbinCheck
Main
Slave Boot.
Solenoid
Tension Thread Thread
Solenoid Hold Cut
Key Key Key
OK
28
Model 8300
Adjusting Upper shaft release arm cam and Clutch release arm
1. Remove the front cover (unit) and the rear cover (unit).
2. Remove screws A and the bobbin winder (unit) .
3. Loosen screws B .
4. Adjust the clearance between the clutch release arm
and the clutch ring to 1mm. Tighten the screw B .
5. Loosen the screw C on the upper shaft cam .
While pressing the clutch pin against the point X
on the upper shaft cam , tighten the screw C .
6. Attach the bobbin winder (unit) , then tighten
setscrew A .
7. Attach the front cover (unit) and the rear cover.
Screw A
Bobbin winder (unit)
Screw B
Clutch release arm
Clutch ring
Gap (1 mm)
Clutch pin
Upper shaft cam
Point X
Screw C
29
Model 8300
Adjusting thread cutter solenoid
The standard clearance between the plunger and the thread cutter solenoid should be 2.0 mm.
1 Remove the belt cover and base (see page 6, 7).
2 Adjust the clearance between the plunger and the
thread cutter solenoid by moving the thread
cutter solenoid setting plate .
3 Tighten screws .
4 Attach the belt cover and base.
Thread cutter solenoid
Screws
2.0mm
30
Model 8300
Adjusting thread cutter
Adjust the thread cutter switch as follows.
1 Remove the needle plate, the bed cover and the free
arm cover (see page 8 and 20).
2 Turn the power switch on while the Start/Stop
button . Do not release the button unitl the LCD
screen shows the adjusting mode .
3 Press Solenoid key.
Main
Slave Boot.
Solenoid 4 Turn the hand wheel to lower the needle bar at its
Tension Thread Thread
Solenoid Hold Cut lowest position.
Key Key Key
OK
5 Loosen the screw and adjust the switch so the
driving arm should be lowered as illustrated in
(fig. 2) when the key is pressed.
Driving arm (1)
6 Tighten the screw.
7 Press the OK key. Turn the power switch OFF.
(Fig. 1) (Fig. 2)
The driving arm is The driving arm is
raised. (switch ON) lowered. (switch OFF) 8 Attach the needle plate, bed cover and the free arm
cover.
31
Model 8300
Adjusting Thread Holding Solenoid
The standard clearance of the thread drawing lever from the surface of bobbin holder should be 1.5 mm when
the solenoid is activated.
Screw (A) Thread holding solenoid
1 Remove the belt cover, base and bed cover
(See page 6, 8 and 9).
2 Adjust the needle thread solenoid so the plate A slightly
touches the lever base.
3 The height of the thread drawing lever from the
surface of bobbin holder should be 4.1 mm. If not, see
page 31 to adjust the height.
4 Check the clearance between the thread drawing
lever and the surface of the bobbin holder. The
clearance should be 1.5 mm when the plunger is pulled.
Plunger Screw (B)
If not, loosen screws (B) and adjust the solenoid to set
the clearance.
Solenoid body
Plate A
Lever base
Clearance 0~0.2mm
Surface
of bobbin
4.1mm
Thread drawing lever holder
1.5mm
32
Model 8300
Adjusting Thread Drawing Lever
Standard height of the thread drawing lever from the surface of bobbin holder should be 4.1 mm.
1 Remove the needle plate.
2 Loosen the hexagonal socket bolt and adjust the
distance of the thread drawing lever by moving the
View A thread drawing lever.
3 Tighten the hexagonal socket bolt.
4 Attach the needle plate.
Thread drawing lever
View A
Surface
of the
bobbin
Tread drawing lever holder 4.1mm
Hexagonal socket bolt
33
Model 8300
Adjusting the Presser Foot Lifter Sensor
Adjust the presser foot lifter sensor after replacing the presser lifter sensor or circuit
board A.
1 Remove the top cover. (See page 3)
1
2 Turn the power switch on while pressing the Start/Stop
2 button. Do not release the button until the LCD screen
shows the adjusting mode.
1 Power switch
2 Start/stop button
3 The LCD screen will show the adjusting mode.
Main 3 Adjusting mode
Slave DC1
Brightness Foot UD Sensor Off 4 Press the "Foot UD" key.
Card / USB PH Sensor Aging 5 Loosen the screw (A).
Solenoid Solenoid Hold Move the switch bracket to adjust its position so that the
LCD screen shows "H" when the foot is raised and
Bobbin BobbinCheck
shows "L" when the foot is lowered.
6 Press the "OK" key.
7 Turn the power switch off and then attach the top
cover.
Tension releas lever Switch bracket
Setscrew (A)
Tension release plate
34
Model 8300
Adjusting the Remaining Bobbin Thread Level
Adjust the remaining bobbin thread level after replacing the circuit board A.
1 Turn the power switch on while pressing the Start/Stop
button. Do not release the button until the LCD screen
shows the adjusting mode.
1 Power switch
2 Start/stop button
2 The LCD screen will show the adjusting mode.
3 Adjusting mode
Main 3 Press the "Bobbin" key.
Slave DC1
4 Wind a bobbin to 9.2 mm diameter and insert it into the
Brightness Foot UD Sensor Off
bobbin holder. Press the "Key" several times.
Card / USB PH Sensor Aging The same value will be shown in the box 4 under the
Solenoid Solenoid Hold "Key" each time you press the key.
4 Box
Bobbin BobbinCheck
5 Press the "MEM1" key and the value will be shown in
the box 5 under the "MEM1" and will be stored in the
memory.
5 Box
6 Wind another bobbin to 10.3 mm diameter and insert it
into the bobbin holder. Press the "Key" several times.
The same value will be shown in the box 4 under the
"Key" each time you press the key.
7 Press the "MEM2" key and the value will be shown in
the box 3 under the "MEM2" and will be stored in the