Janome 5030 Sewing Machine Service Manual

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SERVICE MANUAL
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All manuals and user guides at all-guides.com
INDEX
WHAT TO DO WHEN........................................................................................................................... 1-3
CHANGING EXTERNAL PARTS

FACE COVER.......................................................................................................................................... 4
FREE-ARM COVER ............................................................................................................................... 5
FRONT COVER....................................................................................................................................... 6
REAR COVER......................................................................................................................................... 7
MECHANICAL ADJUSTMENT
PRESSER BAR HEIGHT........................................................................................................................ 8
NEEDLE DROP POSITION..................................................................................................................... 9
ADJUSTMENT OF HOOK TIMING....................................................................................................... 10
ADJUSTMENT OF NEEDLE BAR HEIGHT.......................................................................................... 11
CLEARANCE BETWEEN NEEDLE AND TIP OF ROTARY HOOK....................................................... 12
FEED DOG HEIGHT............................................................................................................................. 13
TOP TENSION...................................................................................................................................... 14
STRETCH STITCH FEED BALANCE................................................................................................... 15
REPLACEMENT AND ADJUSTMENT OF THE NEEDLE THREADER PLATE.................................... 16
ADJUSTING BUTTONHOLE LEVER POSITION.................................................................................. 17
SELF-DIAGNOSTIC TEST
SELF-DIAGNOSTIC TEST............................................................................................................... 18-23
TO DISPLAY THE VERSION OF THE PROGRAM............................................................................... 23
REPLACING THE ELECTRONIC COMPONENTS

PRINTED CIRCUIT BOARD A CONNECTION..................................................................................... 24
PRINTED CIRCUIT BOARD A.............................................................................................................. 25
PRINTED CIRCUIT BOARD F2............................................................................................................ 26
PRINTED CIRCUIT BOARD F1............................................................................................................ 27
PRINTED CIRCUIT BOARD L.............................................................................................................. 28
DRIVING MOTOR (DC MOTOR)........................................................................................................... 29
SWITCHING REGULATOR UNIT.......................................................................................................... 30
WHAT TO DO WHEN
Condition Cause How to fix Reference
1. Skipping 1. Needle is not inserted properly. Insert the needle properly.

Stitches
2. Needle is bent or worn. Change the needle.
3. Incorrectly threaded. Rethread.
4. Needle or thread are Use the recommended sewing needle

inappropriate for the fabric and thread.
being sewn.
5. Sewing on stretch fabric. Use a HA x #11 blue tip needle.
6. Inappropriate needle bar height. See mechanical adjustment “Needle bar P. 11

height”.
7. Inappropriate needle to hook See mechanical adjustment “Adjustment P. 10
timing. of hook timing”.
8. Inappropriate needle to hook See mechanical adjustment “Clearance P. 12

clearance. between needle and tip of the rotary
hook”.
2. Fabric not 1. Incorrect feed dog height. Adjust the presser bar level to make P. 13
moving the pressure stronger. See mechanical
adjustment “Feed dog height”.
2. Feed dog is in down position. Raise the feed dog.
3. Thread on bottom side of Make sure to bring both needle and

fabric is jammed up. bobbin threads under the foot when start
sewing.
4. Feed dog teeth are worn. Change the feed dog.
1
Condition Cause How to Fix Reference
3. Breaking 1. Initial sewing speed is Start with medium speed.

upper too fast.
thread.
2. Thread path is incorrect. Use the proper thread path.
3. Needle is bent or dull. Replace with a new needle.
4. Top tension is too strong. Adjust top tension correctly.
5. Needle size is inappropriate for Use appropriate needle for fabric and
fabric. thread in use.
6. Needle eye is worn. Change the needle.
7. Needle hole in needle plate is Repair the hole or replace the needle
worn or burred. plate.
4. Breaking 1. Bobbin holder is incorrectly Set the bobbin thread correctly.

bobbin threaded.
thread.
2. Too much thread is wound Adjust the position of bobbin winder
on the bobbin. stopper.
3. Lint is stuck inside the bobbin Clean the bobbin holder.

holder.
4. Thread quality is too low. Change to a high quality sewing thread.
Clear out the jamming thread.

5. Thread is jamming around the
bobbin holder.
5. Needle 1. Needle is hitting the needle plate. See mechanical adjustment “Needle drop P. 9
breaks position”.
2. Needle is bent or worn. Change the needle.
3. Needle is hitting the hook. See mechanical adjustment “Clearance P. 12

between needle and tip of the rotary
hook”.
4. Fabric is being pulled too strongly Guide the fabric gently while sewing.
while sewing.
2
Condition Cause How to fix Reference
6. Noisy 1. Backlash between hook gear Eliminate the backlash.

operation and lower shaft gear is too
great.
2. Lower shaft gear is loose. Eliminate the looseness.
3. Inappropriate belt tension. See part removal and replacement P. 29

“driving motor (DC motor)”.
4. Not enough oil. Oil all moving parts.
5. Upper shaft gear is loose. Eliminate the looseness.
7. Deformation 1. Inappropriate feed balance. Adjust the feed balancing screw. P. 15

pattern
2. Top tension is too strong. See mechanical adjustment P. 14

“Top tension”.
3
Changing External Parts

FACE COVER
To remove:
1. Remove the cap and setscrew q and lift the face cover to disengage the rib on the inside.
Remove the face cover w.
To attach:
2. Follow the above procedures in reverse.
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4

FREE-ARM COVER
To remove:
1. Remove the setscrew q and w.
Move the free-arm cover e to the left.
Remove the free-arm cover.

To attach:
Follow the above procedures in reverse.
5

FRONT COVER
To remove:
1. Remove the face cover and free-arm cover (See page 4 and 5).
2. Remove the setscrews q (2 pcs.).
3. Remove the setscrews w (4 pcs.), back cover e.
4. Remove the setscrews r (2 pcs.).
5. Loosen the setscrew t.
6. Disengage the front cover and rear cover hooks.
7. Remove the front cover.
8. Disconnect all the connectors from the circuit board A.
NOTE:
Do not disconnect the connectors by pulling on cord. To disconnect, grasp the connector, not the cord.
To attach:
7. Follow the above procedures in reverse. See "PRINTED CIRCUIT BOARD A CONNECTION". (Page 24)
q
w e
w w
r r
6

Rear cover
To remove:
1. Remove the face cover and free-arm cover (See page 4 and 5).
2. Remove the setscrews q (2 pcs.) and the setscrews w (3 pcs.).
3. Remove the setscrews e (4 pcs.) and back cover r.
4. Remove the setscrews t (2 pcs.).
6. Disengage the front cover and rear cover hooks.
7. Remove the front cover.
To attach:
q
e r
e e
w
t t
7
Mechanical Adjustment
PRESSER BAR HEIGHT
The distance between the bottom of the presser foot in up position and the needle plate should be 6.0 mm.
1. Remove the face plate and needle.

2. Lower the feed dog below the needle plate.
Place a block 6 mm thick under the presser foot and lower the presser foot lifter w.
3. Loosen the setscrew q. Raise the presser foot lifter and tighten the setscrew q firmly.
Attach the needle and face plate.
NOTE:
Make sure that the presser foot should be parallel to the feed dog slots in the needle plate.
q
w
6.0 mm
Presser foot should be parallel

to the feed dog slots.
Feed dog slots
8
Needle drop position
Set the stitch pattern to “ ”. The standard needle drop position should be at center of the needle plate hole.
Select zigzag stitch “ ”, and set the stitch width at “7.0”. The clearance between the needle and the edge of the
needle hole should be at least 0.2 mm on either side. If not, adjust as follows:
1. Turn the power switch off. Remove the face cover. (See page 4.)
2. Loosen the hexagonal socket screw 3 x 4 q. Adjust the needle drop position by turning the eccentric pin.
The direction of eccentric pin should be as shown in Fig. 1.
3. Attach the face cover.
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NOTE:
Check the hook timing after this adjustment.
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needle plate hole

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Fig. 1
0.2 mm 0.2 mm
or more or more
A=B
9
Adjustment of hook timing
The amount of ascending travel of the needle bar from its lowest position to the position ( ) where the tip of
the rotary hook exactly meets the right side of the needle should be 3.25 to 3.55 mm.
1. Remove the needle plate and bobbin holder.

2. Turn the power switch on.
3. Select the pattern (left position). Set the zigzag width at 0.
4. Remove the free-arm cover. (See page 5.)
Turn the handwheel toward you to lower the needle at its lowest position.
5. Loosen the hexagonal socket screw w (2 pcs.).
6. Move the needle bar 3.4 mm from the lowest position.
7. Turn the lower shaft gear until the tip of hook meets the right side of the needle while holding the handwheel.
8. Tighten the hexagonal socket screw w (2 pcs.).
9. Attach the free-arm cover, bobbin holder and needle plate.
Needle plate w
Bobbin holder
Lower shaft gear w
Tip of hook meets the

right side of the needle
Left position ( )
(#14)
3.25 – 3.55 mm
Lowest needle position
10
Adjustment of needle bar height
Before proceeding with this adjustment, check the hook timing (refer to page 10). The distance between the
upper edge of the needle eye and the tip of the hook should be in the range of 1.6 to 2.0 mm when the tip of the
hook timing meets right side of the needle in the left needle position ( ) as the needle ascends from its lowest
position.
1. Remove the needle plate, bobbin holder and face plate.

2. Turn the power switch on.
3. Select the pattern (left position). Set the zigzag width at 0.
4. Turn the handwheel toward you until the tip of hook meets the right side of the needle.
5. Loosen the hexagonal socket screw q.
6. Move the needle bar to adjust the needle bar height, and tighten the hexagonal socket screw q.
Be careful not to turn the needle bar.
7. Attach the bobbin holder, needle plate and face cover.
Needle plate
Bobbin holder q
Needle setting
groove
Tip of hook meets the right side of the needle
Left position ( ) Hook race

(#14) 1.6 – 2.0 mm
Upper edge of needle hole

Hook race (unit)
11
Clearance between needle and tip of the rotary hook
* The clearance between the needle and the point of hook should be –0.1 to +0.05 mm.
Adjustment procedure:
1. Remove the needle plate and bobbin holder. Attach the master needle. Turn the power switch on and set the
zigzag width at maximum.
2. Remove the face cover. (See page 4.)
3. Loosen the setscrews q (2 pcs.).
4. Turn the handwheel toward you. Adjust the clearance between the needle and the tip of the rotary hook, by
moving the hook base plate up or down, to within –0.1 to +0.05 mm at the left and right needle position.
5. Tighten the setscrews q (2 pcs.).
6. Attach the face cover. Remove the master needle. Attach the bobbin holder and needle pate.
7. Check the clearance between the needle and the edge of the needle hole in the needle plate (see page 9).
Needle plate
Needle bar supporter
adjusting plate q
Bobbin holder
Tip of hook
–0.1 to +0.05 mm
12
Feed dog height
The highest position of the feed dog should be between 0.80 and 0.90 mm from the surface of the needle
plate.
1. Lower the presser foot and turn the power switch on.
2. Turn the handwheel toward you to set the feed dog at the highest position.
3. Remove the free-arm cover. (See page 5.)
4. Loosen the setscrew q and nut w.
5. Adjust the feed dog height by turning the adjusting screw e.
The highest position of the feed dog should be between 0.80 and 0.90 from the surface of the needle plate.
6. Tighten the nut w and setscrew q.
7. Attach the free-arm cover.
Presser foot
0.80 – 0.90 mm
Feed dog
Surface of the needle plate
A B
q e
w
13
Top tension
The top tension should be between 65 and 80 g when pulling the thread up in the direction of arrow.
* Use polyester sewing thread #50 (White).
* If it is not within the above limit, adjust as follows.
1. Set the tension dial “4”.

2. Remove the face cover and front cover. (See page 4 and 6.)
3. Lower the presser foot.
• If the top tension is too loose, turn the lead screw in the direction (A).
• If the top tension is too tight, turn the lead screw in the direction (B).
4. Check the top tension and attach the cover.
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Pull the thread at the speed of 110 mm/sec in the direction of arrow
White polyester thread size 50
14
STRETCH STITCH FEED BALANCE
To check:
1. Enter the self-diagnostic mode (see below).
Attach the Satin stitch foot F. Place a fabric under the presser foot. Lower the presser foot.
2. Press the locking stitch button to start test sew, and check the results (the standard figure length of 5
pieces of figure 8 is 33-39 mm).
3. If stretch patterns are distorted, correct them with the feed balancing dial.
If stretch patterns are too deformed and cannot be corrected with the feed balancing dial, adjust as follows.
To adjust:
1. Remove the feed balancing dial cover. Turn the dial at standard position as illustrated.
Turn the power switch ON.
Select the straight stitch and set the stitch length at “0”. Place a fabric under the presser foot.
Lower the presser foot. (Do not set bobbin and needle threads)
2. Turn the hexagonal socket screw to the left to loosen it.
Move the gear up (A) or down (B) to adjust the feed.
* Do not move the gear right or left when adjusting.
Start the machine and check the movement of the fabric.
Adjust the hexagonal socket screw position (gear position) until the fabric will not be fed with the stitch
length setting at “0”.
3. Tighten the socket screw and attach the feed balancing dial cover.
Enter the self-diagnostic mode and test sew again. Check that the standard length of 5 pieces of figure 8 is
33-39 mm. If not, turn the feed balancing dial to correct it.
To enter self-diagnostic mode:
Turn the power switch on while The LCD display will Press the value set key Press the start/stop
simultaneously pressing auto- indicate “01”. 7 times to display the “08”. button to display the
lock button and needle up/down “88” and to enter
button. the stretch stitch test
mode.
Incorrect Correct Incorrect
Feed balancing dial cover
36–39mm
Feed balancing dial

(Standard position)
(A)
Hexagonal socket screw
The standard figure length of 5 pieces of figure (B)
8 is 33-39 mm
Gear
15
REPLACEMENT AND ADJUSTMENT OF THE NEEDLE THREADER PLATE
If the hook of the threader plate is damaged, change and adjust the part as follows:
TO CHANGE THE THREADER PLATE:

1. Push down the needle threader knob and pull the threader plate supporter down to remove it (see FIG 1).
2. To install the needle threader plate, line the groove up with the pin and push it up to snap fit.
TO ADJUST THE THREADER PLATE POSITION:

1. If the hook on the threader positioning plate touches the top or bottom side of the needle hole, loosen
setscrew q and adjust the hook position (FIG.2).
2. If the hook on the threader plate touches the left or right side of the needle hole, loosen setscrew w and
adjust the hook position (FIG 3).
Replacing the threader plate supporter

(with the threader plate attached) FIG. 1
Pin
Threader plate
supporter
Vertical adjustment FIG. 2 Adjustment of left or right direction FIG. 3
View from "X"
Nut w
X
Threader
positioning
plate
Threader plate
q
16
Adjusting buttonhole lever position
To adjust the buttonhole lever guide:
1. Enter the diagnostic test of buttonhole sensor mode. (See pages 18 and 19. The LCD should display 03 and
BH symbol.)
2. Remove the face cover (see page 4) and loosen the setscrew q.
3. Move the buttonhole lever guide so the BH symbol disappear when the buttonhole lever is lowered.
Tighten the setscrew.
To adjust the buttonhole sensor position:

4. Attach the buttonhole foot (R).
5. Lower the buttonhole lever to its lowest position and open a 1.6 mm gap between the slider and the
buttonhole foot.
6. Turn the adjusting screw w to the left until the LCD display BH symbol.
7. Next, turn the adjusting screw to the right until the BH symbol disappears.
8. Turn off the power switch.
9. Attach the face cover.
Note:
If there is any lint or dust in the buttonhole sensor slit, loosen the screw e and clean it out with a swab.
To enter adjusting mode
Buttonhole lever guide

e
BH sensor
q
Buttonhole lever
1.6 mm gap
Buttonhole foot (R)
17
Self-diagnostic Test
Preparation:
1. Turn the power switch off.
2. Move the bobbin winder spindle to the left.
3. Raise the feed dog.
4. Set the speed control lever to the left.
5. Remove the presser foot and raise the presser foot lifter.
6. Turn the hand wheel toward you to raise the needle to its highest position.
NOTE:
• Be careful: the sewing machine may start running in its own while in test mode.
• Turn off the power switch before replacing any parts.
• Repeat the diagnostic test until the problem has been resolved.
• You can skip steps in the diagnostic procedure and go directly to the test you want to perform.
(Enter self-diagnostic mode, then select the step number of the diagnostic test you require by pressing the
start/stop button.)
To begin:
Turn on the switch. If any of the following problems occur, take the recommended actions in the order they
are shown.
1. The machine does not respond when the power switch is turned on:
• Check each connector connection
• Replace the machine socket
• Replace the switching regulator
• Replace the printed circuit board A
2. The sewing machine lamp does not light up:

• Replace the light bulb
• Replace the printed circuit board A
To enter self-diagnostic mode:
1. Turn the power switch on while 2. The LCD display 3. Press the start/stop
simultaneously pressing auto-lock will indicate “01”. button to enter the
button and needle up/down button. self-diagnostic mode.
18
Step and
items to Procedure Correct Condition Defective Condition
check
01) Turn on the power switch while Sewing lamp and LCD backlight lit. Sewing lamp does not lit.
Function of simultaneously pressing the LCD displays “01 ----”. LCD backlight does not lit.
LCD, buzzer auto-lock button and needle up/ LCD does not display.
and lamp down button. Buzzer does not sound.
LCD does not turned on.
Press the start/stop button to LCD does not display any
enter the self-diagnostic mode. symbols or not in order.
If the result is correct condition,
–REMEDY–
press the start/stop button to Buzzer sounds. LCD displays symbols Replace the circuit board A.
proceed the next step. and numbers and blinks. Replace the circuit board L.
m
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
02)
Button
4 5 3
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LCD displays “SC 02--”.
Buzzer sounds when button is
pressed. Button number is displayed
when the button is pressed.
Buzzer does not sound.
LCD does not display the
number correctly.
–REMEDY–
Replace the circuit board A.
es
Replace the circuit board F2.
Press buttons 1– 5. LCD displays “S3” when button 1 is pressed.

If the result is correct condition, LCD displays “S4” when button 2 is pressed.
press the start/stop button to LCD displays “S6” when button 3 is pressed.
proceed the next step. LCD displays “S8” when button 4 is pressed.
uid
If the result is defective condition, LCD displays “S9” when button 5 is pressed.
03) LCD displays “SC 03--”. Buzzer does not sound.

Lower the buttonhole lever.
Buttonhole BH symbol does not appear.
Move the buttonhole lever back When the buttonhole lever is pulled,
Sensor
and forth. buzzer sounds and LCD displays BH
symbol. –REMEDY–
BH symbol Adjust the BH lever sensor
-g
press the start/stop button to

proceed the next step. position.
If the result is defective condition, Replace the BH lever
press the reverse stitch button to sensor.
proceed the next step. When the buttonhole lever is pushed, Replace the circuit board A.
buzzer sounds and LCD displays BH
all
symbol.
04) Move the bobbin winder spindle LCD displays “SC 04--”. Buzzer does not sound.
Bobbin to the right. When the bobbin winder spindle is Bobbin symbol is not dis-
winder Return it to the left. moved to the right, buzzer sounds and played.
switch If the result is correct condition, LCD displays the bobbin symbol.
press the start/stop button to –REMEDY–
proceed the next step. When the bobbin winder spindle is Adjust the bobbin winder
moved to the left, buzzer sounds and switch position.
If the result is defective condition, Replace the bobbin winder
press the reverse stitch button to bobbin symbol disappear.
switch.
proceed the next step. Replace the circuit board A.
Bobbin symbol
19
Step and
check
05) Not applicable for this machine. LCD displays “SC 05--” and presser
presser Press the start/stop button to foot symbol.
foot proceed the next step. Presser
lifter
foot
switch
symbol
06) Turn the handwheel toward you. LCD displays “SC 06--”. Buzzer does not sound.
Upper shaft Lower the needle bar from its Stitch width or length
positioning highest to lowest position. symbol does not appear.
sensor Raise the needle bar from its
lowest position to highest –REMEDY–
position. Replace the circuit board P.
If the result is correct condition, Turn the handwheel. Replace the circuit board A.
press the start/stop button to LCD displays stitch width symbol
proceed the next step. when the needle bar is at zigzag
phase.
press the reverse stitch button to Stitch
proceed the next step. width
symbol
LCD displays stitch length symbol

when the needle bar is at feed phase.
Stitch
length
symbol
07) Turn the handwheel toward you. LCD displays “SC 07--”.
Zigzag motor Lower the needle bar its highest Zigzag motor does not get
(Step motor) Stitch
to position (zigzag phase). default position.
and width
Press the needle up/down button. buzzer does not sound.
Feed motor symbol
Raise the needle bar from its
–REMEDY–
lowest position to its highest Press the needle up/down button Replace the zigzag motor.
position (feed phase). when LCD displays stitch width Replace the circuit board A.
Press the needle up/down button. symbol.
If the result is correct condition, The Zigzag motor will be initialized
press the start/stop button to and get its default position.
Stitch Feed motor does not get
length default position.
symbol buzzer does not sound.
–REMEDY–
Press the needle up/down button
Replace the feed motor.
when LCD displays stitch length
symbol.
The feed motor will be initialized and
get its default position.
20
Step and
check
08) Attach the foot control to the LCD displays “SC 08--”. The foot control symbol
Foot
machine. does not appear.
control
Depress the foot control as far as Buzzer does not sound.
it goes, then release it.
–REMEDY–
Replace the foot control.
The foot control symbol appears when Replace the machine
the foot control is attached. socket (foot control
If the result is defective condition, socket).
Foot control
press the reverse stitch button to Replace the circuit board A.
symbol
Buzzer sounds when the foot control is

deeply depressed.
Buzzer sounds when the foot control is
released.
09) Shift the slide volume from left to LCD displays “SC 09--”. Buzzer does not sound.
Slide right, then return to the left.
volume –REMEDY–
press the start/stop button to Replace the slide volume.
proceed the next step. Replace the circuit board A.
If the result is defective condition, Buzzer sounds at rightmost or leftmost

press the reverse stitch button to position.
10) Press the needle up/down button. LCD displays “SC 10--”. The machine motor does
DC motor not start.
If the result is correct condition, The motor stops
press the start/stop button to immediately.
proceed the next step. The motor runs unstable.
Machine runs slow, then fast, and the –REMEDY–
If the result is defective condition, needle bar stops at its highest position. Replace the DC motor.
11) Not applicable for this machine. LCD displays “SC 11of”.
thread Press the start/stop button to
tension proceed the next step.
release
solenoid
12) Not applicable for this machine. LCD displays “SC 12--”.
thread
cutter Press the start/stop button to
motor, proceed the next step.
thread
cutter
solenoid
21
Step and
check
13) LCD displays “OK” or “NG”, LCD displays “OK” when the LCD displays “NG”.
EEPROM depending on the EEPROM EEPROM is correct condition.
condition. –REMEDY–
“OK”
LCD displays “NG” when the
EEPROM is defective condition.
“NG”
22
Buzzer sounds after few seconds when the self-diagnostic test has been finished.
The test result has been determined.
Correct:
Buzzer sounds and LCD displays “00”
Defective:
Caution buzzer sounds and LCD displays the defective part
number. Refer to pages 19-22 and fix the defective part.
Each time you press the start/stop button, the defective part
number(s) will be displayed.
The defective part number.
See pages 19-22 “Steps and
items” section.
Press the reverse stitch button to return to 01.

Turn the power switch off when the self-diagnostic test is finished.
To display the version of the program
1. Turn the power switch on 2. The LCD display 3. Press the value set 4. Press the start/
while simultaneously will indicate “01”. key twice to display stop button to
pressing auto-lock button the “03”. display the version
and needle up/down button. of the program.
5. Each time you press the start/stop button, the version number will be partially displayed in sequence.
Example: 811-1-1.00-001
23
Replacing the Electronic Components

PrinTed Circuit board A Connection
NOTE:
Do not disconnect the connectors by pulling on cord.
To disconnect, grasp the connector, not the cord.
m
Bobbin winding switch (Blue)
Foot control (Black)
.co Presser foot lifter switch (Green)
Switching regulator (White)
BH sensor (Red)
es
Zigzag width motor (Green)
Printed circuit board L (Blue)

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Printed circuit board F2 (Black)
Printed circuit board F1 (White)

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Printed circuit board P (Black) Feed motor (White) DC motor (White)
Printed circuit board A

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Printed circuit board F2
Printed circuit board F1
Printed circuit board L
24

PRINTED Circuit board A
To remove:
1. Remove the front cover. (See page 6.)
2. Pull out connectors from the printed circuit board A.
3. Remove the screws (4 pcs.) and the printed circuit board A.
To attach:
NOTE:
Setscrews Printed circuit board A
25

PRINTED Circuit board F2
To remove:
3. Remove the screws (3 pcs.) and the printed circuit board F2.
To attach:
NOTE:
Setscrews
Connector (Black) Printed circuit board F2
26

PRINTED Circuit board F1
To remove:
3. Remove the screws (2 pcs.) and LED cover.
4. Remove the printed circuit board F2.
To attach:
NOTE:
Connector (White) Printed circuit board F2
Setscrews
LED cover
27

PRINTED Circuit board L
To remove:
3. Remove the screw and LED cover.
4. Remove the printed circuit board L.
To attach:
NOTE:
Connector (Blue)
Setscrew
Printed circuit board L

in LED cover
28

Driving motor (DC MOTOR)
To remove:
2. Remove the setscrews q (2 pcs.), setscrew w (1 pcs.), the driving motor and the belt.
To attach:
1. Install the driving motor and the motor belt. Tighten them with setscrews q (2 pcs.) lightly.
2. Move the motor up or down to adjust the motor belt tension.
m
The belt should deflect 5 mm when applying 200 grams of load to the middle of the belt.
Tighten the setscrews q (2 pcs.) firmly.
3. Secure the cables using the nylon clip and tighten the setscrew w .
4. Attach the front cover.
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Nylon clip w q
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Belt
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200 g pressure
5 mm
DC motor (unit)
29

Switching regulator unit
To remove:
1. Remove the front cover and the rear cover. (See pages 6 and 7.)
2. Remove the setscrews q (3 pcs.) and the switching regulator.
3. Remove the setscrews w (4 pcs.).
To attach:
Switching
regulator
q q
30

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WHAT TO DO WHEN........................................................................................................................... 1-3

CHANGING EXTERNAL PARTS

REPLACING THE ELECTRONIC COMPONENTS

1. Skipping 1. Needle is not inserted properly. Insert the needle properly.

3. Incorrectly threaded. Rethread.

4. Needle or thread are Use the recommended sewing needle

5. Sewing on stretch fabric. Use a HA x #11 blue tip needle.

6. Inappropriate needle bar height. See mechanical adjustment “Needle bar P. 11

8. Inappropriate needle to hook See mechanical adjustment “Clearance P. 12

2. Feed dog is in down position. Raise the feed dog.

3. Thread on bottom side of Make sure to bring both needle and

4. Feed dog teeth are worn. Change the feed dog.

Condition Cause How to Fix Reference

3. Breaking 1. Initial sewing speed is Start with medium speed.

3. Needle is bent or dull. Replace with a new needle.

4. Top tension is too strong. Adjust top tension correctly.

6. Needle eye is worn. Change the needle.

4. Breaking 1. Bobbin holder is incorrectly Set the bobbin thread correctly.

3. Lint is stuck inside the bobbin Clean the bobbin holder.

4. Thread quality is too low. Change to a high quality sewing thread.

Clear out the jamming thread.

2. Needle is bent or worn. Change the needle.

3. Needle is hitting the hook. See mechanical adjustment “Clearance P. 12

Condition Cause How to fix Reference

6. Noisy 1. Backlash between hook gear Eliminate the backlash.

2. Lower shaft gear is loose. Eliminate the looseness.

3. Inappropriate belt tension. See part removal and replacement P. 29

4. Not enough oil. Oil all moving parts.

5. Upper shaft gear is loose. Eliminate the looseness.

7. Deformation 1. Inappropriate feed balance. Adjust the feed balancing screw. P. 15

2. Top tension is too strong. See mechanical adjustment P. 14

Changing External Parts

Changing External Parts

Changing External Parts

Changing External Parts

1. Remove the face plate and needle.

Presser foot should be parallel

Feed dog slots

needle plate hole

1. Remove the needle plate and bobbin holder.

Lower shaft gear w

Tip of hook meets the

Lowest needle position

1. Remove the needle plate, bobbin holder and face plate.

Tip of hook meets the right side of the needle

Left position ( ) Hook race

Upper edge of needle hole

1. Set the tension dial “4”.

White polyester thread size 50

To enter self-diagnostic mode:

Incorrect Correct Incorrect

Feed balancing dial cover

Feed balancing dial

TO CHANGE THE THREADER PLATE:

TO ADJUST THE THREADER PLATE POSITION:

Replacing the threader plate supporter

Vertical adjustment FIG. 2 Adjustment of left or right direction FIG. 3

View from "X"

To adjust the buttonhole sensor position: