SERVICE MANUAL

MODEL 6260QC

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 Table Of Contents
What To Do When ................................................................................................................ 1-3
Service Access
Face Cover ............................................................................................................................. 4
Top Cover ................................................................................................................................ 5
Belt Cover ............................................................................................................................... 6
Base ........................................................................................................................................ 7
Front Cover ............................................................................................................................. 8
Rear Cover .............................................................................................................................. 9

Mechanical Adjustment
Needle Thread Tension ......................................................................................................... 10
Presser Bar Height And Alignment ......................................................................................... 11
Needle Drop Position ............................................................................................................ 12
Stretch Stitch Feed Balance ................................................................................................. 13
Feed Dog Height ................................................................................................................... 14
Needle Bar Height ................................................................................................................. 15
Needle Timing to Hook .......................................................................................................... 16
Clearance between Needle and Hook .................................................................................. 17
Backlash between Hook Gear and Lower Shaft Gear .......................................................... 18
Replacement and Adjustment of Needle Threader Plate ...................................................... 19
Self-Diagnostic Test ...................................................................................................... 20 – 22
Replacing A-Board and Fuse ................................................................................................ 23
Connector Diagram ............................................................................................................... 24
Replacing Machine Socket ................................................................................................... 25
Replacing Transformer .......................................................................................................... 26
Replacement and Adjustment of Upper Shaft Sensor .......................................................... 27
Replacing DC Motor .............................................................................................................. 28
Replacing Slide Volume and F-Board ................................................................................... 29
Replacing Zigzag Motor ........................................................................................................ 30
Replacing Feed Motor ........................................................................................................... 31
Adjusting Bobbin Winder Switch ........................................................................................... 32
Adjusting Buttonhole Lever Position ..................................................................................... 33

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 What to Do When
Condition Cause How to fix Reference

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

stitches properly.
2. Needle is bent or worn. Change the needle.
3. Incorrectly threaded. Rethread.
4. Needle or thread is Use the recommended
inappropriate for fabric sewing needle and thread.
being sewn.
5. Sewing on stretch fabric. Use a #11 blue tip needle.
6. Presser foot pressure is too Adjust the presser bar level to
weak. make the pressure stronger.
7. Inappropriate needle bar See mechanical adjustment p.15
height. “needle bar height”.
8. Inappropriate needle to See mechanical adjustment p.16
shuttle timing. “needle to shuttle timing”.
9. Inappropriate needle to see mechanical adjustment p.17
shuttle clearance. “needle clearance to shuttle.”

2. Fabric not 1. Presser foot pressure is too Adjust the presser bar level to
moving weak. make the pressure stronger.
2. Incorrect f.d. height. See mechanical adjustment p.14
“feed dog height.”
3. F.d. is in down position. Raise the f.d.
4. Thread on bottom side of Make sure to bring both needle
fabric is jammed up. and bobbin thread under the
foot when starting sewing.
5. Feed dog teeth are worn. Change the feed dog.

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 Condition Cause How to fix Reference

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

upper fast.
thread 2. Thread path is incorrect. Use the proper thread path.
3. Needle is bent or dull. Replace with a new needle.
4. Upper thread tension is too Adjust upper thread tension p.10
strong. correctly.
5. Needle size is inappropriate Use appropriate needle for
for fabric. fabric and thread in use.
6. Needle eye is worn. Change the needle.
7. Needle hole in needle plate repair the hole or
is worn or burred. Replace the needle plate.

4. Breaking 1. Incorrectly threaded bobbin. Thread bobbin correctly.

bobbin 2. Too much thread is on the Adjust the position of stopper.
thread bobbin.
3. Lint is stuck inside the Clean the shuttle.
bobbin holder.
4. Thread quality is too low. Change to a high quality
sewing thread.
5. Thread is jamming around Clear out the jamming thread.
the bobbin.

5. Needle 1. Needle is hitting the needle See mechanical adjustment p.12

breaks plate. “needle position”.
2. Needle is bent or worn. Change the needle.
3. Needle is hitting the shuttle. See mechanical adjustment p.17
“needle clearance to shuttle”.
4. The fabric moves while the See mechanical adjustment p.27
needle is piercing it, or the “zigzag synchronization”.
needle zigzags while in
fabric.
5. Fabric is being pulled too Guide the fabric gently while
strongly while sewing. sewing.

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 Condition Cause How to fix Reference

6. Noisy 1. Backlash between shuttle See mechanical adjustment p.18

operation hook gear and lower shaft “backlash (lower shaft gear)”.
gear is too great.
2. Lower shaft gear is loose. Eliminate the looseness.
3. Inappropriate belt tension. See mechanical adjustment p.28
“motor belt tension”.
4. Not enough oil. Oil all moving parts.
5. Upper shaft is loose. Eliminate the looseness.

7. Deformed 1. Inappropriate feed balance. See mechanical adjustment p.13

pattern “stretch stitch balance”.
2. Inappropriate zigzag See mechanical adjustment p.27
synchronization. “needle synchronization”.
3. Upper thread tension is too See mechanical adjustment p.10
strong. “top tension”.

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 Service access (1)
Face cover

Face cover

Setscrew (A)

Cap

Tab Setscrew (B) Setscrew (C)

To remove:
1. Remove the cap (A).
2. Remove the setscrews (B) and (C).
3. Lift up the top cover and unfasten the tab of the top cover from the face cover.
Remove the face cover

To attach:
4. Follow the above procedure in reverse.

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 Service Access (2)
Top cover

Top cover

Handle

Setscrew (A)
(2 pcs)

To remove:
1. Remove the face cover (see page 4).
2. Remove the 2 setscrews (A) and remove the handle and top cover.

To attach:
3. Follow the above procedure in reverse.

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 Service Access (3)
Belt cover

Setscrew (A)

Cap

Setscrew (B)
Belt cover

To remove:
1. Remove the face cover and top cover (see pages 4 and 5).
2. Remove the cap.
3. Remove the setscrews (A), (B) and remove the belt cover.

To attach:
4. Follow the above procedure in reverse.

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 Service Access (4)
Base

Setscrew (B) Setscrew (C)

Setscrew (A)

Setscrew (D)

Setscrew (F) Setscrew (E)

Base

To remove:
1. Remove the setscrews (A) to (F).
Remove the base.

To attach:
2. Follow the above procedure in reverse.

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 Service Access (5)
Front cover

Setscrew (B)

Setscrew (A)
Front cover

Setscrew (E) Setscrew (D)

Setscrew (F)

To remove:
1. Remove the face cover, top cover and belt cover. (See pages 4-6.)
2. Remove the setscrews (A) to (E) and loosen the setscrew (F).

To attach:
3. Follow the above procedure in reverse.

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 Service Access (6)
Rear cover

Rear cover
Setscrew (D)
Setscrew (A)
Setscrew (B)

Setscrew (C)
Cap

To remove:
1. Remove the face cover, top cover and belt cover. (See pages 4-6.)
2. Remove the setscrews (A), (B), (C), (D) and remove the rear cover.

To attach:
3. Follow the above procedure in reverse.

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 Mechanical Adjustment

Needle Thread Tension

The standard tension should be 75 to 90 grams when the tension dial is set at “A” (Auto), measured with a #50 white
polyester thread being pulled at approximately 50 mm/sec.
If the tension is outside the standard range, adjust it as follows.

Adjustment procedure:
1. Remove the face cover.
2. If the thread tension is too tight: Turn the adjusting screw in the direction of (A).
If the thread tension is too loose: Turn the adjusting screw in the direction of (B).
3. Attach the front cover.

Pull this way

Adjusting screw

(B)

(A)

10

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 Mechanical Adjustment

Presser Bar Height and Alignment

When the presser foot is raised, the clearance between the presser foot and the needle plate should be 6.0 mm.
When the presser foot is lowered, the edge of the foot and the feed dog window on the needle plate should be
parallel.

Remove the face cover and raise the presser foot. Loosen the setscrew to adjust the presser foot height (6.0 mm)
and the presser foot alignment.
Tighten the setscrew firmly.
Attach the face cover.

Setscrew 4 x 8
Presser bar lifter

<Presser foot alignment>

<Presser bar height>
Zigzag foot Feed dog window

Needle plate Should be parallel

6.0 mm

Feed dog

11

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 Mechanical adjustment
Needle Drop Position

Set the stitch pattern to “ “. The standard needle drop position should be at the 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 on the needle plate should be at least 0.2 mm on either side. If not, adjust as follows.

Adjustment procedure:
1. Remove the front cover (See page 4.).
2. Loosen the setscrews (A) and (B). Slightly tighten the setscrew (A).
3. Adjust the position of the stitch width adjusting plate so that the needle is in the center of the needle hole
when the straight stitch “ “ is selected.
4. Tighten the setscrews (A) and (B).
5. Check the needle drop position of the zigzag stitch “ “ with the maximum width. Attach the front cover.

Setscrew (A)

Needle plate hole

Stitch width adjusting plate

Setscrew (B) 0.2 mm 0.2 mm

or more or more
A=B

12

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 Mechanical adjustment
Stretch Stitch Feed Balance

If the stretch stitch patterns are deformed when sewing the patterns with the feed balancing dial is set at
the standard position “ “, correct it as follows:

Adjustment procedure:
1. Select the straight stretch stitch “ “.
2. Set the feed balancing dial at the standard position “ “.
3. Place a piece of paper on the machine and lower the presser foot. Rotate the handwheel several turns
and check the needle marks in the paper.
4. Insert the screwdriver through the opening of the base to access the adjusting screw (C).
If the forward feed is longer (A>B): Turn the adjusting screw in the direction of (D).
If the backward feed is longer (B>A): Turn the adjusting screw in the direction of (E).

Insert the screw driver through the poening

Feed balancing dial

(E)
(D)

Adjusting screw (C)

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 Mechanical adjustment
Feed Dog Height

The height of the deed dog should be 0.8-0.9 mm above the needle plate.

Adjustment procedure:
1. Select the straight stitch “ “.
2. Set the foot pressure dial at “3” and lower the foot.
3. Loosen the setscrew (A).
4. Turn the handwheel to bring the feed dog to its highest position.
If the feed dog height is lower than 0.8 mm: Turn the adjusting screw (B) in the direction of (C).
If the feed dog height is higher than 0.9 mm: Turn the adjusting screw (B) in the direction of (D).
5. Tighten the setscrew (A).

Presser foot
0.80 to 0.90 mm

Feed dog Needle plate surface

(D)

(C)

Setscrew (A)

Adjusting screw (B)

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 Mechanical adjustment
Needle Bar Height

When the tip of the hook meets the left side of the needle in ascending travel of the needle from its left
and lowest position, the distance between the top of the needle eye and the tip of the hook should be in
the range of 1.6 to 2.0 mm.

1. Select the straight stitch “ “ and set the stitch width at “7.0”.
2. Remove the needle plate (A) and bobbin holder (B).
3. Turn the handwheel until the tip of the hook point meets with the right side of the needle.
4. Remove the face cover and loosen the setscrew (C).
5. Adjust the needle bar height by moving the needle bar up or down.
6. Tighten the setscrew (C).
7. Attach the face cover, bobbin case and needle plate.
Note: Be sure that the groove on the needle bar is facing right in the front.

Setscrew (C)

Needle plate setscrew

Needle plate (A)

Groove

Hook (B)

Bobbin holder

Hook point right side of needle

1.8 mm + - 0.2 mm
Needle (#14)

Top of needle eye

Hook race

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 Mechanical adjustment

Needle Timing to Hook

When the hook point meets with the right side of the needle, the height of needle point from its lowest and left most
position should be 3.25-3.55 mm.

Adjustment procedure:
1. Select the straight stitch “ “ and set the stitch width control at “7.0”.
2. Remove the presser foot, needle plate (A) and bobbin holder (B).
3. Remove the front cover (See page 8.).
4. Turn the handwheel to bring the needle to its lowest position.
5. Loosen the 2 setscrews (C) in the lower shaft gear.
6. Turn the handwheel to raise the needle bar 3.4 mm from the lowest position.
7. Rotate the lower shaft gear until the hook point meets with the right side of the needle, while holding the
handwheel in place.
8. Tighten the setscrews (C).
9. Attach the front cover.
10.Attach the bobbin holder, needle plate and presser foot.

Nedle plate setscrews

Hook point meets right
side of needle
Needle plate

3.25 mm to 3.55 mm

Hook

Bobbin holder
Setscrew (C)

Lower shaft gear

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 Mechanical adjustment

Clearance between Needle and Hook

The clearance between the needle and hook should be -0.10 to +0.05 mm.

Adjustment procedure:
1. Select the zigzag stitch “ “ and set the stitch width at “7.0”.
2. Remove the needle plate (A) and bobbin holder (B).
3. Replace the needle with the test pin and tighten the needle clamp screw.
4. Remove the face cover (See page 4.).
5. Turn the handwheel to bring the hook point just behind the test pin. Loosen the setscrew (C) and
adjust the clearance between the needle and hook point to –0.10 to 0.05 mm by moving the top end
of the needle supporter back or forth.
6. Tighten the setscrew (C).
7. Attach the face cover.
8. Attach the bobbin holder and needle plate. Replace the master needle with the sewing needle.

Setscrew (C)
Needle clamp
screw
Needle plate setscrew

Needle plate (A)

Needle bar supporter

Tept pin

Hook
Hook point
Bobbin holder (B) -0.10 to +0.05 mm

17

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 Mechanical adjustment
Backlash between Hook Gear and Lower Shaft Gear
The rotary play of the hook point should be 0.8 mm or less when it is in between the span of
the feed dog teeth. And, the gears should turn smoothly.

Adjustment procedure:
1. Remove the needle plate (A) and bobbin holder (B).
2. Remove the front cover (See page 8.).
3. Loosen the setscrew (E).
4. If the rotary play is too large: Turn the lower shaft bushing in the direction of (C).
If the rotary play is too small: Turn the lower shaft bushing in the direction of (D).
5. Tighten the setscrew (E).
6. Attach the front cover.
7. Attach the bobbin holder and needle plate.

Note: After adjustment of the backlash, check the needle timing to hook and feed dog height,
and adjust them if necessary.

Needle plate setscrew

The span of feed dogs

Hook point
Nedle plate (A)
Check the play

Hook

Bobbin holder (B)

Setscrew (E)
Hook shaft gear
Lower shaft gear
(C) (D)
Notch
Direction of notch on
lower shaft bushing

Lower shaft bushing

18

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 Mechanical adjustment

Replacement and Adjustment of Needle Threader Plate

To replace:
1. Pry out the threader plate holder with a screwdriver while pushing up and holding the threader
knob (See fig. 1.).
2. Align the groove on the new threader plate holder with the pin (B) on the threader shaft.
Push the threader plate holder (C) up until it snaps in place.

To adjust:
3. If the threader hook thrusts or hits against either left or right edge of the needle eye: Loosen
the setscrew (E) and adjust the position of the threader plate (H) (See fig. 2).
4. If the threader hook thrusts against either top or bottom edge of the needle eye, or misses
the needle eye: Remove the face cover and loosen the setscrew (F). Move the threader position
setting holder (G) up or down to adjust the hook position.

[ Fig. 1]

Pin (B)

Threader knob

[Fig. 3]
Hook (D) Threader plate holder (C)

Threader position
setting holder (G)
[Fig. 2]

Setscrew (F) Setscrew (E)

Threader plate (H)

View - X
Hook (D)

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 Self-diagnostic Test
Preparation:
1. Turn off the power switch.
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.
7. Connect the foot control to the machine.

Notes:
• 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 needle up/down button.)

To begin:
Turn on the power 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 A-board.
Replace the power transformer.

2. The sewing machine lamp does not light up:

Replace the light bulb.
Replace the A-borad.

3. The LED display shows ” to ” : Replace the A-borad.

To enter self-diagnostic mode:

Turn the power switch on while simultaneously pressing the needle up/down button and the reverse button.
Press the reverse button five times to select menu item “6”.
Press the needle up/down button.
Note: If the interval between each step is longer than 2.5 seconds, the machine will revert to normal sewing mode.
Should this occur, start over again from the step 1.

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 Step and items
Procedure Correct Condition Defective Condition
to check
01) Turn on the power switch while Beep sounds when the Does not enter self-diagnostic
7-segment LED simultaneously pressing the button is pressed. mode.
needle up/down button and the LED displays “8.8.” And it LED does not blink on or off.
reverse button. Press the reverse blinks in one second
button five times to select menu Intervals. 1. Replace A-board.
item “6”. Press the needle up/ No beep sound
down button: the LED indicates
LED
“01” for one second. If you don’t
press the reverse button within
2.5 seconds, the machine
automatically reverts to normal
sewing mode.
02) Press needle up/down button, 7-segment LED displays LED does not blink on or off.
Mode LED LED displays “02” for one “Ld” and 3 mode LEDs
1. Replace A-board.
second. blink in one second
intervals.

01 16 31 46

Sensor

03) Press needle up/down button, LED display is different from

Button LED displays ”03” for one LED displays that shown to the left.
second.
Press buttons S1 to S8. 1. Replace A-board.

S1 S2 S3 S4 Button number is displayed

Button when the button is pressed
#

01 16 31 46

Button Sensor

S5 S6 S7 S8 S1 S8
04) Press needle up/down button, LED displays “II”. LED display is different from
Bobbin winder LED displays “04” for one that shown to the left.
switch second. 1. Adjust bobbin winder switch
Move the bobbin winder spindle position.
(Left)
to the right. 2. Replace bobbin winder
Return it to the left. switch.
(Right)
3. Replace A-board.

05) Skip this step by pressing the

Not applicable to needle up/down button
this model
06) Press needle up/down button, When the buttonhole lever LED display is different from
Buttonhole Sensor LED displays “06” for one is pulled, LED displays “H”. that shown to the left.
second. When the buttonhole lever 1. Adjust buttonhole sensor
Lower the buttonhole lever. is free (positioned in the position
Move the buttonhole lever back center), LED displays “L”. 2. Replace buttonhole sensor.
and forth. When the buttonhole lever 3. Replace A-board.
is pushed, LED displays
“H”.

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 Step and items
Procedure Correct Condition Defective Condition
to check
07) Press the needle up/down button, When the needle is at the LED display is different from that
Upper shaft LED displays “07” for one second. highest position, LED displays shown to the left.
Turn the hand wheel toward you to “H.L”.
sensor
raise and lower the needle to its When the needle is at the 1. Adjust upper shaft shield
highest and lowest positions. lowest position, LED displays plate.
“L.H”. 2. Replace upper shaft
When the needle is halfway, sensor.
LED displays “L.L. 3. Replace A-board
08) Press the needle up/down button. LED displays “00” first and the LED display is different from
Sewing speed LED displays “08” for one second. indicated value increases as that shown to the left.
sensor Turn the hand wheel clockwise by you turn the handwheel.
hand and check the counter value (When the value reaches 100, 1. Replace DC motor
on the LED. it will return to “00” and one 2. Replace A-board
mode LED lights up. For
(The LED blinks to indicate a example, 2 mode LEDs and
counter value of 100.) “78” means “278”.)
The maximum value
should be 370 to 390.

09) Press the needle up/down button, When the speed control lever LED display is different from
Slide volume LED displays “09” for one is at the left, LED displays “00”. that shown to the left.
second. The indicated value
Slide the speed control lever from (hexadecimal) increases as 1. Replace slide volume.
the left to the right, then return it you move the speed control 2. Replace A-board.
to the left. lever to the right, and finally it
shows “FF” when the lever
reaches the right-most
position.

10) Press the needle up/down When the foot control is not LED display is different from
Foot control button. The LED displays “10” depressed, LED should display that shown to the left.
for one second. “F0” to “FF” (hexadecimal value).
Depress the foot control down When the foot control is fully 1. Replace foot control.
all the way and release it. depressed, LED should display 2. Replace machine socket.
“05” to “2F”. 3. Replace A-board.
When the foot control is
disconnected, LED should show
“00” to “04”.
Press the needle up/down button, LED display is different from that
11) LED displays “bS”.
the LED displays “11” for one shown to the left.
Zigzag motor
second.
Zigzag motor is set to the initial If LED displays “E1”,
Press the start/stop
position. (Needle centered) replace the zigzag
Button
motor or A-board.
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

Feed motor Turn the hand wheel toward you LED displays “FS”. LED display is different from that
to lower the needle to its lowest shown to the left.
position, then press start/stop Feed motor is set to the initial position. If LED displays “E2”,
button. (Stitch length: 0) replace the feed motor
or A-board.
12) Press needle up/down button, LED displays “dc”. LED display is different from that
DC motor LED indicates “12” for one shown to the left.
second. Machine runs at the speed set by the If LED displays “E2”,
Press foot control speed control lever. replace the feed motor
Full left: 80Å`100 spm or A-board.
Full right: 800Å`840 spm. Machine does not run,
LED displays “Lo”.

1. Replace DC motor
2. Replace A-board.

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 Replacing A-Board and Fuse
To Replace the A-board:
1. Remove the rear cover (see page 9).
2. Remove the 3 setscrews (A) and unplug the connectors from the A-board.
3. Remove the 6 setscrews (B) and 2 setscrews (C) then remove the board supporter and function button
frame.
4. Remove the 2 setscrews (D) and remove the board case then replace the A-board.
Note:
Static electricity may damage the A-board. When handling the A-board, use a static dissipative wristband
and anti-static tabletop mat.

Board supporter

Setscrew (A)
Setscrew (B)
Setscrew (B) Function button frame

A - board
Setscrew (C)

Setscrew (B)
Setscrew (B)
Setscrew (A)
Setscrew (C)

Setscrew (A)

Setscrew (B)

A - board case
Setscrew (B)

Setscrew (D)
Setscrew (D)

To replace the fuse:

Pry out the fuse with a screwdriver.
Replace the fuse and push it down into the fuse clip.

A - board
F3 AC250V 2.5A
Fuse (#000144605)

F2 AC250V 3.15A
(#000182904)

F1 AC250V 2.5A
(#000144605)

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 Connector Diagram

Machine socket connector (primary)

Transformer connector (primary)
DC motor connector
Transformer connector (secondary)
BH sensor connector
Lamp connector
F-board connector
Slide volume
Bobbin winder switch connector
Upper shaft sensor connector
Machine socket connector (secondary)
Zigzag motor connector
Feed motor connector

Slide volume

Bobbin winder switch connector F-board connector

Lamp connector

BH sensor connector

Upper shaft sensor

connector

Machine socket connector

(secondary)
Transformer connector (secondary)

Zigzag motor connector

DC motor connector
Feed motor connector

Transformer connector (primary)

Machine socket connector (primary)

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 Replacing Machine Socket

To remove:
1. Remove the front cover (see page 8).
2. Remove the board supporter (see page 23) and unplug the machine socket connectors (both primary
and secondary).
3. Remove the 2 setscrews (A) and remove the machine socket.

To attach:
4. Follow the above procedure in reverse.

Setscrew (A)

Machine socket

Setscrew (A)

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 Replacing Transformer

To remove:
1. Remove the front cover (see page 8).
2. Remove the board suppoerter (see page 23) and unplug the transformer connectors (both primary
and secondary).
3. Remove the 2 setscrews (A) and remove the transformer.

To attach:
4. Follow the above procedure in reverse.

Setscrew (A)

Setscrew (A)

Transformer

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 Replacement and Adjustment of Upper Shaft Sensor
During zigzag sewing, lateral movement of the needle should take place 7.4 to 9.8 mm above the
needle plate.

Adjustment procedure:
1. Remove the top cover (see page 15).
2. Select the zigzag stitch “ “ and turn the handwheel to check the lateral movement of the needle.
If the needle starts lateral movement higher than 9.8 mm: Loosen the setscrew (C) and turn the
upper shaft shielding plate in the direction of (A).
If the needle starts lateral movement lower than 7.4 mm: Loosen the setscrew (C) and turn the
upper shaft shielding plate in the direction of (B).
3. Attach the top cover.

(B)

7.4 to 9.8 mm
(A)

Setscrew (C)
To replace the upper shaft sensor:
1. Remove the front cover (see page 8).
2. Remove the board supporter (see page 23) and unplug the upper shaft sensor connector.
3. Remove the 2 setscrews (D) and remove the sensor mounting.
4. Remove the 2 setscrews (E) and remove the upper shaft sensor.

To attach:
5. Follow the above procedure in reverse.

Setscrew (E)

Upper shaft sensor

Sensor mounting Setscrew (D)

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 Replacing DC Motor

To remove:
1. Remove the front cover (See page 8.).
2. Remove the board supporter (see page 23) and unplug the DC motor connector.
3. Remove the 2 setscrews (A) and replace the DC motor.

To attach:
4. Follow the above procedure in reverse.

To adjust motor belt tension:

1. Slightly loosen the 2 setscrews (A). Move the motor to adjust the motor belt tension so that the belt is
bent 7-9 mm when pressing the middle of the belt with approximately 300 grams of pressure.
2. Tighten the setscrews.

Deflection: 7 to 9 mm

300g loard

Setscrew (A)

Motor

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 Replacing Slide Volume and F-Board

Replacing the slide volume control

To remove:
1. Remove the front cover (see page 8).
Unplug the slide volume connector.
2. Remove the 6 CS rings and replace the slide volume.

Replacing the F-board

To remove:
1. Remove the front cover (see page 8).
Unplug the F-board.
2. Remove the 5 CS rings.
3. Remove the 3 setscrews (A) and replace the F-board.

To attach:
4. Follow the above procedure in reverse.

Setscrew (A)

CS ring

CS ring

F-board
CS ring

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 Replacing Zigzag Motor

To remove:
1. Remove the front cover (see page 8).
2. Unplug the zigzag motor connector.
3. Remove the 2 setscrews (A) and replace zigzag motor.

To attach:
4. Follow the above procedure in reverse.

Note:
After replacement, check the needle drop position and adjust it if necessary (see page 13).

Setscrew (A)

Zigzag motor

Setscrew (A)

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 Replacing Feed Motor

To remove:
1. Remove the front cover (see page 8).
2. Unplug the feed motor connector.
3. Remove the 2 setscrews (A) and replace feed motor.

To attach:
4. Follow the above procedure in reverse.

Setscrew (A)

Feed motor

Setscrew (A)

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 Adjusting Bobbin Winder Switch

The LED display shows “ ” when the bobbin winder spindle is set to the left and “ “ when
the bobbin winder spindle is set to the right.

Adjustment procedure:
1. Remove the top cover (see page 8).
2. Set the bobbin winder spindle in the sewing position and loosen the setscrew.
Adjust the clearance between the bobbin winder arm and the switch mounting to 0.7-1.3 mm.
3. Tighten the setscrew.
4. Attach the top cover.

0.7 to 1.1 mm
Setscrew
Bobbin winder arm

Switch mounting

Sewing position Bobbin winding position

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 Adjusting Buttonhole Lever Position
To adjust the buttonhole lever guide:
1. Enter the buttonhole sensor adjusting mode. (See below. The LED should display “H” or “L”.)
2. Remove the face cover (see page 4) and loosen setscrew (A).
3. Move the buttonhole lever guide so the LED displays “L” when the buttonhole lever is lowered.
Tighten setscrew (A).

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
buttonhole foot.
6. Turn the adjusting screw (B) to the left until the LED display changes from “L” to “H”.
7. Next, turn the adjusting screw to the right until the LED display changes from ”H” to “L”.
8. When the gap of the buttonhole foot is 1.4 mm, the LED should display “H”. When the gap is 1.8 mm,
the LED should display “L”.
9. Turn off the power switch.
10. Attach the face cover.

Note: If there is any lint or dust in the buttonhole sensor slit, clean it out with a swab.

To enter adjusting mode:

Turn the power ON while pressing Press the reverse button to Press the needle up/down button.
the needle up/down button and select step number “_2”.
reverse button simultaneously.
(Hold both buttons down until the
LED displays the adjusting
mode window.)

Setscrew (B)
BH lever guide

BH sensor
Setscrew (A)

Adjusting screw
BH lever

1.6 mm gap

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