Page 1
1
SERVICE MANUAL
&
PARTS LIST
MODEL: NH60
Page 2
2
LOCATE AND IDENTIFY PARTS ..................................................................................................3
WIND THE BOBBIN ......................................................................................................................4
PREPARE YOUR TOP THREAD ...................................................................................................5
LCD DISPLAY ...............................................................................................................................6
WHAT TO DO WHEN ................................................................................................................ 7-9
CHANGING EXTERNAL PARTS
FACE COVER..............................................................................................................................10
FREE-ARM COVER ...................................................................................................................11
FRONT COVER .................................................................................................................... 12-13
REAR COVER .............................................................................................................................14
MECHANICAL ADJUSTMENT
PRESSER BAR HEIGHT ............................................................................................................15
NEEDLE DROP POSITION ........................................................................................................16
ADJUSTMENT OF HOOK TIMING .............................................................................................17
REPLACING HOOK ....................................................................................................................18
ADJUSTMENT OF NEEDLE BAR HEIGHT ................................................................................19
CLEARANCE BETWEEN NEEDLE AND TIP OF HOOK ROTARY ............................................20
FEED DOG HEIGHT ...................................................................................................................21
TOP TENSION ............................................................................................................................22
REPLACING THE ELECTRONIC COMPONENTS
CIRCUIT BOARD-A CONNECTION ...........................................................................................23
SELF-DIAGNOSTIC TEST .................................................................................................... 24-28
CIRCUIT BOARD-A .............................................................................................................. 29-30
DRIVING MOTOR .......................................................................................................................31
SWITCHING REGULATOR UNIT ................................................................................................32
ADJUSTING BUTTONHOLE LEVER POSITION ........................................................................33
PARTS LIST .......................................................................................................................... 34-47
INDEX
Page 3
3
LOCATE AND IDENTIFY PARTS
NEEDLE CLAMP
NEEDLE
PRESSER
FOOT HOLDER
PRESSER FOOT
CARRYING HANDLE
HANDWHEEL
POWER SWITCH
MACHINE SOCKET
FREE ARM
PRESSER FOOT LIFTER
THREAD
TENSION DIAL
SPOOL PIN
BOBBIN WINDER
SPINDLE
BOBBIN WINDER
STOPPER
VALUE SET BUTTONS
CURSOR BUTTONS
SPEED CONTROL SLIDER
NEEDLE POSITION UP/
DOWN BUTTON
AUTO-LOCK BUTTON
LCD DISPLAY
REVERSE STITCH BUTTON
START/STOP BUTTON
EXTENSION TABLE
NEEDLE PLATE
NEEDLE
THREADER
THREAD
CUTTER
FACE COVER
DROP FEED LEVER
FOOT CONTROL JACK
Page 4
4
WIND THE BOBBIN
1. Hold the thread with both hands and pass the bobbin winding tension disc (1).
2. Pass the thread through the hole in the bobbin from the inside to the outside. Put the
bobbin on the bobbin winder spindle (2).
3. Push the bobbin winder spindle to the right.
4. Hold the free end of the thread in your hand and start the machine.
Stop the machine when the bobbin has been wound a few layers, and cut the thread close
to the bobbin.
5. Start the machine again. When the bobbin is fully wound, it will stop automatically.
Stop the machine and return the bobbin winder spindle to its original position by moving
it to the left, and cut the thread with a pair of scissors. Remove the bobbin from the
bobbin winder spindle.
10
1/8
3/8
5/8
2. Guide the thread into notch on the front
side of the bobbin holder. Draw the thread
to the left, sliding it between the tension
spring blades.
3. Continue to draw the thread lightly until
the thread slips into notch. Pull out
about 6˝ (15.0 cm) of thread.
1. Place a bobbin in the bobbin holder with
the thread running off counterclockwise.
4. Attach the hook cover plate. Check the
threading by referring to the diagram
shown on the hook cover plate.
(1)
(2)
Page 5
5
PREPARE YOUR TOP THREAD
* Raise the thread take-up lever to its highest position by turning the handwheel
counterclockwise.
* Raise the presser foot lifter.
* Place a spool on the spool pin, with the thread coming off the back of spool.
1. Draw the end of the thread around the
upper thread guide.
2. While holding the thread near the spool,
draw the end of the thread down around
the check spring holder.
3. Firmly draw the thread up from right to
left over the take-up lever, and down into
the take-up lever eye.
4. Draw the thread through the thread guide.
Slide the thread behind the needle bar thread
guide on the left.
5. Thread the needle from front to back, or use a
needle threader.
1
3
2
5
4
Page 6
6
LCD DISPLAY
The LCD display shows the following information when the machine is turned on.
q
STITCH PATTERN NUMBER
w
CURSORS
e
STITCH WIDTH
r
STITCH LENGTH
z
Press the cursor key to move the cursor under the stitch pattern number.
The cursors appear under both digits when turning the power on.
x
Press the value set keys to change the stitch pattern number until the
pattern number of the desired stitch is indicated.
The number will increase or decrease by 1 each time you press the value set key.
c
Press the key to move the cursor under the tens digit of the stitch pattern number.
The number will increase or decrease by 10 each time you press the value set key.
q
w
e r
z
x
c
Page 7
7
CONDITION CAUSE HOW TO FIX REFERENCE
1. SKIPPING
STITCHES
2. FABRIC
NOT
MOVING
1. Needle is not inserted
properly.
2. Needle is bent or worn.
3. Incorrectly threaded.
4. Needle or thread are
inappropriate for the
fabric being sewn.
5. Sewing on
stretch fabric.
6. Inappropriate needle
bar height.
7. Inappropriate needle to
hook timing.
8. Inappropriate needle to
hook clearance.
9. Hook is damaged or too
worn.
1. Incorrect feed dog
height.
2. Feed dog is in down
position.
3. Thread on bottom side of
fabric is jammed up.
4. Feed dog teeth are worn.
Insert the needle properly.
Change the needle.
Rethread.
Use the recommended sewing
needle and thread.
Use a HA x #11 blue tip needle.
See mechanical adjustment “Needle
bar height”.
See mechanical adjustment
“Adjustment of hook timing”.
See mechanical adjustment
“Clearance between needle and tip
of the rotary hook”.
See mechanical adjustment
“Replacing hook”.
Adjust the presser bar level to make
the pressure stronger.
See mechanical adjustment “Feed
dog height”.
Raise the feed dog.
Make sure to bring both needle and
bobbin threads under the foot when
start sewing.
Change the feed dog.
P. 1 9
P. 1 7
P. 2 0
P.18
P. 2 1
WHAT TO DO WHEN
Page 8
8
CONDITION CAUSE HOW TO FIX REFERENCE
3. BREAKING
UPPER
THREAD.
4. BREAKING
BOBBIN
THREAD.
5. NEEDLE
BREAKS
1. Initial sewing speed is
too fast.
2. Thread path is incorrect.
3. Needle is bent or dull.
4. Top tension is too strong.
5. Needle size is
inappropriate for fabric.
6. Needle eye is worn.
7. Needle hole in needle
plate is worn or burred.
1. Bobbin holder is
incorrectly threaded.
2. Too much thread is wound
on the bobbin.
3. Lint is stuck inside the
bobbin holder.
4. Thread quality is too low.
5. Thread is jamming around
the bobbin holder.
1. Needle is hitting the
needle plate.
2. Needle is bent or worn.
3. Needle is hitting the hook.
4. Fabric is being pulled
too strongly while sewing.
Start with medium speed.
Use the proper thread path.
Replace with a new needle.
Adjust top tension correctly.
Use appropriate needle for fabric
and thread in use.
Change the needle.
Repair the hole or replace the
needle plate.
See mechanical adjustment
“Needle drop position”.
Change the needle.
See mechanical adjustment
“Clearance between needle and
tip of the rotary hook”.
Guide the fabric gently while
sewing.
P. 1 6
P. 2 0
Page 9
9
Eliminate the backlash.
Eliminate the looseness.
See part removal and
replacement “Driving motor (DC
motor)”.
Oil all moving parts.
Eliminate the looseness.
See mechanical
adjustment “Replacing hook”.
Adjust the feed balancing screw.
See mechanical adjustment
“Top tension”.
CONDITION CAUSE HOW TO FIX REFERENCE
6. NOISY
OPERATION
7. DEFORMATION
PATTERN
1. Backlash between hook
gear and lower shaft
gear is too great.
2. Lower shaft gear is loose.
3. Inappropriate belt
tension.
4. Not enough oil.
5. Upper shaft gear is loose.
6. Hook is damaged or too
worn.
1. Inappropriate feed
balance.
2. Top tension is too strong.
P. 3 1
P.18
P. 2 2
Page 10
10
CHANGING EXTERNAL PARTS
FACE COVER
TO REMOVE:
1. Loosen the setscrew (1) and lift the face cover to disengage the rib on the inside.
Remove the face cover (2).
TO ATTACH:
2. Follow the above procedures in reverse.
(1)
(2)
Page 11
11
CHANGING EXTERNAL PARTS
FREE-ARM COVER
TO REMOVE:
1. Loosen the setscrew (1) and (2). Move the free-arm cover (3) to the left. remove the
free-arm cover.
TO ATTACH:
2. Follow the above procedures in reverse.
(1)
(3)
(2)
Page 12
12
Thread tension unit
CHANGING EXTERNAL PARTS
FRONT COVER (1)
TO REMOVE:
1. Remove the face cover and free-arm cover (see page 8 and 9).
2. Remove the setscrews (1) (2 pcs.).
3. Remove the setscrews (2) (5 pcs.), back cover (3) .
4. Remove the setscrews (4) (2 pcs.).
5. Loosen the setscrew (5).
6. 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.
(1)
(3)
(2)
(2)(2)
(4)
(4)
(5)
Page 13
13
CHANGING EXTERNAL PARTS
FRONT COVER (2)
1. Disengage the front cover and rear cover hooks.
2. Remove the front cover.
TO ATTACH:
3. Follow the above procedures in reverse.
Page 14
14
Back cover
Rear cover
CHANGING EXTERNAL PARTS
REAR COVER
TO REMOVE:
1. Remove the face cover and free-arm cover (see page 8 and 9).
2. Remove the setscrews (A) (4 pcs.).
3. Remove the setscrews (B) (5 pcs.) and back cover.
4. Remove the setscrews (C) (2 pcs.). Remove the rear cover.
TO ATTACH:
5. Follow the above procedures in reverse.
Setscrews (A)
Setscrews (A)
Setscrews (B)
Setscrews (B)
Setscrews (C)
Page 15
15
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 (1).
3. Loosen the setscrew (2). Raise the presser foot lifter and tighten the setscrew (1) firmly.
Attach the needle and face plate.
NOTE:
Make sure that the presser foot should be parallel to the feed dog slots (3) in the needle plate.
Presser foot should be parallel
to the feed dog slots.
6.0 mm
(1)
(2)
(3)
Page 16
16
MECHANICAL ADJUSTMENT
NEEDLE DROP POSITION
Set the stitch pattern to “ ”. The standard needle drop position should be at center of the needle
plate hole (1). Select zigzag stitch “ ”, and set the stitch width at “5.0”. The clearance between the
needle and the edge of the needle hole in the needle plate 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 10.)
2. Loosen the hexagonal socket screw 3 x 4 (2). Adjust the needle drop position by turning the
eccentric pin.
3. Attach the face cover.
4. The direction of eccentric pin should be as shown in Fig. 1.
NOTE:
Check the hook timing after this adjustment.
0.2 mm
or more
0.2 mm
or more
A=B
Fig. 1
(1)
(2)
Page 17
17
MECHANICAL ADJUSTMENT
ADJUSTMENT OF HOOk TIMING
MACHINE SETTING:
1. Remove the free-arm cover.
2. Select Pattern: No.00 (straight stitch)
3. Turn the power switch off.
TO ADJUST:
1. Remove the needle, presser foot, needle plate (A) and bobbin holder (B).
2. Insert the radial timing gauge (C) so that the small finger on the gauge fits into the slot near the tip
of the hook.
3. Put the test pin (D) in the needle clamp. * Push it up until it stops.
4. Tighten the needle clamp screw (E).
5. Loosen the 2 screws (F) in the lower shaft gear (G).
6. Hold the handwheel so that the test pin (D) will not move, and turn the lower shaft gear (G) until
the test pin (D) comes in be tween the two white lines of gauge (C).
7. Tighten 2 screws (F).
8. Attach the bobbin holder, needle plate, presser foot and needle.
9. Attach the bed cover and base cover.
(A)
(B)
A
C
B
(C)
(D)
(E)
(G)
(F)
(F)
Page 18
18
Hook
(B)
(D)
(E)
(D)
(F)
Needle plate setscrew
Needle plate
Bobbin holder
(A)
Hook
(C)
Marks
Right edge of feed dog teeth
Hook point
MECHANICAL ADJUSTMENT
REPLACING HOOk
I
f the hook point is damaged or too worn, the hook needs to be replaced.
TO REMOVE:
1. Remove the needle plate and bobbin holder.
2. Remove the front cover (see page 12 and 13).
3. Turn the handwheel toward you to align the hook point and the right edge of feed dog teeth.
4. Mark both the handwheel and the rear cover to indicate where the hook point and the right edge of
feed dog teeth meets.
5. Loosen the setscrew (A).
6. Push the hook shaft(B) from the hole (C) with allen screwdriver. Remove the shaft, washers (D),
(E) and (F). * Washers (D) are transparent. washer (E) has a projection on its edge.
Insert the projection in the groove of the gear when attaching.
7. Remove the hook from the hook race. do not remove the feed dog teeth when removing it.
TO ATTACH:
8. Reverse the procedure above. align the hook point and the right edge of feed dog teeth when
attaching the hook to the hook race. (Match the marks on the handwheel and rear cover. Wipe out
the marks after this attachment.)
9. Check the hook timing (see page 17) after the replacement.
If necessary, adjust the hook timing.
Page 19
19
(F)
(A)
(B)
(C)
(E)
(G)
(D)
(I)
(H)
(J)
(C)
MECHANICAL ADJUSTMENT
ADJUSTMENT OF NEEDLE BAR HEIGHT
NEEDLE BAR HEIGHT
MACHINE SETTING:
1. Remove the face cover. (See page 10)
2. Select Pattern: No.00 (straight stitch).
3. Turn the power switch off.
TO ADJUST:
1. Remove the needle, presser foot, needle plate (A) and bobbin holder (B).
2. Insert the radial timing gauge (C) so that the small finger on the gauge fits into the slot near the tip
of the hook.
3. Attach the needle bar height gauge (D). * Push it up until it stops.
4. Tighten the needle clamp screw (E).
5. Loosen the screw (F) on the needle bar holder.
6. Turn the handwheel toward you until the needle bar reaches its lowest position.
7. Move the needle to adjust the position of the needle bar so that the face (G) touches the side of
pin (H) and the end of pin (I) touches the surface (J) of gauge (C).
8. Tighten the screw (F) securely.
9. Attach the bobbin holder, needle plate, presser foot and the needle.
Page 20
20
MECHANICAL ADJUSTMENT
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.
3. Loosen the setscrew (A) (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 setscrew (A) (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 16).
Tip of hook
–0.1 to +0.05 mm
Needle bar supporter
adjusting plate
Hexagonal socket screw
(A)
Needle plate
Bobbin holder
Page 21
21
CORRECT
LOW
HIGH
MECHANICAL ADJUSTMENT
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.
TO CHECk:
1. Remove the presser foot.
2. Turn the power switch on.
3. Turn the handwheel toward you to set the feed dog at the highest position. Remove the free-arm
cover.
4. Place the gauge (A) (#68496) on the needle plate as illustrated. Turn the handwheel by hand to
check the gauge movement. The feed dog height should be in accordance with chart 1.
ADJUSTMENT PROCEDURE:
• Thefeeddogislow
Loosen the setscrew (1) and nut (2). Turn the adjusting screw (3) in the direction of (B) to raise
the feed dog.
•
The feed dog is high
Loosen the setscrew (1) and nut (2). Turn the adjusting screw (3) in the direction of (C) to lower
the feed dog.
5. Adjust the feed dog height by turning thee adjusting screw (3).
6. Tighten the nut (2) and setscrew (1), attach the free-arm cover.
B C
(A)
To raise
To lower
CHART 1
GAUGE FEED DOG HEIGHT
FACE (A)
0.95MM 0.75MM
NOT MOVING
NOT MOVING
MOVING
FACE (B)
MOVING
NOT MOVING
MOVING
(1)
(2)
(3)
(1)
Page 22
22
MECHANICAL ADJUSTMENT
TOP TENSION
The top tension should be between 65 and 80g when pulling the thread up in the
direction of C.
* 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 cover.
3. Lower the presser foot.
•Ifthetoptensionistooloose,turntheleadscrewinthedirection(A).
•Ifthetoptensionistootight,turntheleadscrewinthedirection(B).
4. Check the top tension and attach the cover.
White polyester thread size 50
Pull the thread at the speed of 110 mm/sec
in the direction of arrow
Page 23
23
Printed circuit board A
Printed circuit board F
Printed circuit board L
REPLACING THE ELECTRONIC
COMPONENTS
CIRCUIT BOARD-A CONNECTION
NOTE:
Do not disconnect the connectors by pulling on cord.
To disconnect, grasp the connector, not the cord.
(1) Printed circuit board P (Black)
(2) Feed motor (White)
(3) Bobbin winding switch (Blue)
(4) Power switch (White)
(5) Zigzag width motor (Green)
(6) Printed circuit board F (White)
(7) Printed circuit board L (White)
(8) Ground wire or Program (Red)
(9) Buttonhole sensor program (Red)
(10) DC motor (White)
(11) Controller (Black)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)(9)(10)(11)
Page 24
24
To enter self-diagnostic mode:
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.
NOTES:
• Becareful:thesewingmachinemaystartrunninginitsownwhileintestmode.
• Turnoffthepowerswitchbeforereplacinganyparts.
• Repeatthediagnostictestuntiltheproblemhasbeenresolved.
• Youcanskipstepsinthediagnosticprocedureandgodirectlytothetestyouwanttoperform.
(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:
•Checkeachconnectorconnection
•Replacethemachinesocket
•ReplacetheSwitchingregulator
•ReplacetheA-board
2. THE SEWING MACHINE LAMP DOES NOT LIGHT UP:
•Replacetheledlump
•ReplacetheA-board
Turn the power switch on while
simultaneously pressing needle
up/down button and the locking
stitch button.
The LCD display will indi-
cate “01”.
Press the start/stop button to en-
ter the self-diagnostic mode.
Page 25
25
Sewing lamp and LCD backlight lit. LCD
displays “01”.
Buzzer sounds. LCD displays symbols and
numbers in order. LCD repeats displaying
after all symbols and numbers are shown.
LCD displays “SC 02”.
Buzzer sounds when button is pressed.
Button number is displayed when the button is
pressed.
LCD displays “S3” when button 1 is pressed.
LCD displays “S4” when button 2 is pressed.
LCD displays “S5” when button 3 is pressed.
LCD displays “S6” when button 4 is pressed.
LCD displays “S8” when button 5 is pressed.
LCD displays “S9” when button 6 is pressed.
Press buttons 1– 6.
If the result is correct condition,
press the start/stop button to
proceed the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
Lower the buttonhole lever.
Move the buttonhole lever back and
forth.
If the result is correct condition,
press the start/stop button to
proceed the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
Turn on the power switch while
simultaneously pressing the start/stop
button and locking stitch button.
Press the start/stop button.
If the result is correct condition,
press the start/ stop button to
proceed the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
14
3
2
5 6
SELF-DIAGNOSTIC TEST
01)
FUNCTION OF
LCD, BUZZER
AND LAMP
PROCEDURE
STEP AND
ITEMS
TO CHECK
CORRECT CONDITION
BH symbol
LCD displays “SC 03”.
When the buttonhole lever is pulled, buzzer
sounds and LCD displays BH symbol.
When the buttonhole lever is pushed, buzzer
sounds and LCD displays BH symbol.
LCD displays "SC 04".
When the bobbin winder spindle is moved
to the left, buzzer sounds.
When the bobbin winder spindle is moved to
the right, buzzer sounds and LCD displays
the bobbin symbol.
Move the bobbin winder spindle to
the right. Return it to the left.
If the result is correct condition,
press the start/stop button to
proceed the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
04)
BOBBIN
WINDER
SWITCH
03)
BUTTONHOLE
SENSOR
02)
BUTTON
Sewing lamp does not lit.
LCD backlight does not lit.
LCD does not display “01”.
Buzzer does not sound.
LCD does not turned on.
LCD does not display any symbols
or not in order.
–REMEDY–
Replace the circuit board A.
Buzzer does not sound.
LCD does not display the number
correctly.
–REMEDY–
Replace the circuit board A.
Replace the circuit board F.
Buzzer does not sound.
BH symbol does not appear.
–REMEDY–
Replace the circuit board A.
Replace the circuit board F.
Bobbin
symbol
Buzzer does not sound.
Bobbin symbol is not displayed.
–REMEDY–
Replace the circuit board A.
Replace the circuit board F.
DEFECTIVE CONDITION
Page 26
26
LCD displays stitch width symbol when the
needle bar is at middle position. (Zigzag
motor get default position.)
LCD displays stitch length symbol when
feed motor gets default position.
LCD displays “SC 06”.
Turn the handwheel.
LCD displays stitch width symbol when the
needle bar is at zigzag phase.
LCD displays stitch length
symbol when the needle bar is at feed
phase.
LCD displays “SC 07”.
Stitch
width
symbol
Stitch
length
symbol
Stitch
length
symbol
Stitch
width
symbol
SELF-DIAGNOSTIC TEST
STEP AND
ITEMS TO
CHECK
Turn the handwheel toward you.
Lower the needle bar from its highest to
its lowest position.
Raise the needle bar from its lowest
position to its highest position.
If the result is correct condition, press
the start/stop button to proceed the next
step.
If the result is defective condition, press
the reverse stitch button to proceed the
next step.
Turn the handwheel toward you.
Lower the needle bar from its highest to
its lowest position.
Raise the needle bar from its lowest
position to its highest position.
If the result is correct condition, press
the start/stop button to proceed the next
step.
If the result is defective condition, press
the reverse stitch button to proceed the
next step.
05)
(Not applicable
for this model)
07)
Zigzag motor
(Step motor)
Feed motor
06)
Upper shaft
positioning
CORRECT CONDITION
DEFECTIVE CONDITION
PROCEDURE
Buzzer does not sound.
Stitch width or length symbol
does not appear.
–REMEDY–
Replace the circuit board A.
Replace the circuit board P.
Zigzag motor does not get
default position.
–REMEDY–
Replace the zigzag motor.
Replace the circuit board A.
Feed motor does not get
default position.
–REMEDY–
Replace the feed motor.
Page 27
27
LCD displays “SC 10”.
Machine runs slow, then fast, and the
needle bar stops at its highest position.
LCD displays “SC 08”.
The foot control symbol appears when the
foot control is attached.
Buzzer sounds when the foot control is
deeply depressed.
Buzzer sounds when the foot control is
released.
LCD displays “SC 09”.
Buzzer sounds at right or left position.
12)
(NOT
APPLICABLE
FOR THIS
MODEL)
DEFECTIVE CONDITION
THE FOOT CONTROL
SELF-DIAGNOSTIC TEST
STEP AND
ITEMS
TO CHECK
08)
FOOT
CONTROL
09)
SLIDE
VOLUME
11)
(NOT
APPLICABLE
FOR THIS
MODEL)
PROCEDURE CORRECT CONDITION
Attach the foot control to the sewing
machine.
Depress the foot control as far as it
goes, then release it.
If the result is correct condition, press
the start/stop button to proceed the next
step.
If the result is defective condition, press
the reverse stitch button to proceed the
next step.
Shift the slide volume from left to right,
then return to the left.
If the result is correct condition, press
the start/stop button to proceed the next
step.
If the result is defective condition, press
the reverse stitch button to proceed the
next step.
Press the needle up/down button.
If the result is correct condition, press
the start/stop button to proceed the next
step.
If the result is defective condition, press
the reverse stitch button to proceed the
next step.
10)
DC MOTOR
The foot control.
Symbol does not appear.
Buzzer does not sound.
–REMEDY–
Replace the foot control.
Replace the machine socket.
Replace the circuit board A.
The machine motor does not
start.
The motor stops immediately.
The motor runs unstable.
–REMEDY–
Replace the DC motor.
Replace the circuit board A.
Buzzer does not sound.
–REMEDY–
Replace the circuit board A.
Page 28
28
SELF-DIAGNOSTIC TEST
Buzzer sounds after few seconds when the self-diagnostic test has been finished.
The test result has been determined.
Turn the power switch off when the self-diagnostic test is finished.
CORRECT:
Buzzer sounds and LCD displays “00”
DEFECTIVE:
Caution buzzer sounds and LCD displays the
defective part number. Refer to page 23-25 and
fix the defective part.
The defective part
number.
See page 23-25 “Steps
and items” section.
TO DISPLAY THE VERSION OF THE PROGRAM
Turn the power
switch on while
simultaneously
pressing needle up/
down button and the
locking stitch button.
The LCD
display will
indicate “01”.
Press the start/stop button
to display the version of the
program.
Press the cursor
button
“ ” twice to
display the “03”.
Page 29
29
Circuit board-F con-
nector
Setscrews
Circuit board-A
Setscrews
Setscrews
Circuit board-L con-
nector
REPLACING THE ELECTRONIC
COMPONENTS
CIRCUIT BOARD-A (1)
TO REMOVE:
1. Remove the front cover. (see pages 12 – 13)
2. Pull out connectors from the circuit board-A.
3. Remove the screws (6 pcs.) and the circuit board-A.
TO ATTACH:
4. Follow the above procedures in reverse.
NOTE:
Do not disconnect the connectors by pulling on cord.
To disconnect, grasp the connector, not the cord.
Page 30
30
REPLACING THE ELECTRONIC
COMPONENTS
CIRCUIT BOARD-A(2)
SETTING THE CIRCUIT BOARD A
After install the circuit board A, select the appropriate setting of the circuit board A.
1. Turn the power switch on while simultaneously pressing left cursor button
“ ” and the right cursor
“ ” button.
2. After the buzzer sounds, press the locking stitch button (1) within 2.5 seconds. The LCD should
displays “S”. If not, press the locking stitch button to select “S” (2).
3. Press the start/stop button to determine the setting.
A long buzzer sounds when the setting correctly finished.
4. Turn the power switch off.
(1)
(2)
Page 31
31
200g pressure
5 mm
Setscrew
DC motor (unit)
Belt
Setscrew
REPLACING THE ELECTRONIC
COMPONENTS
DRIVING MOTOR
TO REMOVE:
1. Remove the front cover.
2. Remove the setscrews (2pcs.) and the driving motor and the belt.
TO ATTACH:
1. Install the driving motor and the motor belt. Tighten them with setscrews (2 pcs.) lightly.
2. Move the motor up or down to adjust the motor belt tension. The belt should deflect 5 mm when
applying 200 grams of load to the middle of the belt.
Tighten the setscrews (2 pcs.) firmly.
3. Attach the rear cover and the front cover.
Page 32
32
Switching
regulator
Setscrew A
Setscrew A
Setscrew A
Setscrew B
Setscrew B
REPLACING THE ELECTRONIC
COMPONENTS
SWITCHING REGULATOR UNIT
TO REMOVE:
1. Remove the front cover and the rear cover.
2. Remove the setscrews A (3 pcs.) and the switching regulator.
3. Remove the setscrews B (4 pcs.).
TO ATTACH:
4. Follow the above procedures in reverse.
Page 33
33
Buttonhole sensor
1.6 mm gap
To enter adjusting mode
Turn the power swith ON while pressing the
needle up/down button and locking stitch button
simultaneously.
Press the start/stop button to
select the step “SC 03”.
MECHANICAL ADJUSTMENT
ADJUSTING BUTTONHOLE LEVER POSITION
TO ADJUST THE BUTTONHOLE LEVER GUIDE:
1. Enter the buttonhole sensor adjusting mode. (See below. The LCD should display BH symbol.)
2. Remove the face cover (see page 8) and loosen the setscrew (A).
3. Move the buttonhole lever guide so the BH symbol disappear when the button hole 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 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 2 screws (B) and clean it out with a
swab.
Setscrew (A)
Buttonhole lever guide
button hole lever
Buttonhole foot (R)
Adjusting screw
Screw (B)
Screw (B)
Page 34
34
MODEL: NH60
PARTS LIST
1
2
3
46
4
5
7
8
9
10
10
11
12
12
13
14
15
16
17
18
18
20
21
22
19
27
26
18
18
25
23
24
24
2
Page 35
KEY PARTS
NO. NO. DESCRIPTION
35
PARTS LIST
MODEL: NH60
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
808601005
000111201
000112800
000036201
508120006
823110010
508054101
820166001
808003001
000004200
508021006
000024206
502064003
661024007
508055009
000002806
650040005
000081005
508056402
808648004
000103509
000072302
808005003
000036005
808511100
808037004
808021005
Upper shaft (unit)
Hexagonal socket screw 4x4
Hexagonal socket screw 4x6
Washer FT80
Shaft fixing metal
Felt
Shaft fixing metal
Lower shaft ring
Upper shaft shielding plate
Spring pin 3x18
Upper shaft gear
Spring pin 3x30
Clutch ring
Clutch spring
Belt wheel
Snap ring E-6
Felt
Setscrew 4x8
Handwheel
Thread take-up lever (unit)
Setscrew 4x10
Washer 4
Needle bar crank rod
Washer FT60
Thread tension (unit)
Syncro belt
Timing belt
Page 36
36
MODEL: NH60
PARTS LIST
1
2
3
4
5
6
7
8
9
13
14
15
17
18
19
20
21
22
23
24
25
26
27
28
16
29
30
31
32
33
34
35
36
37
38
40
40
41
42
49
48
50
51
39
52
53
54
55
55
56
57
58
9
10
59
9
40
11
12
60
61
61
62
63
66
9
64
65
43
45
44
46
47
Page 37
KEY PARTS
NO. NO. DESCRIPTION
37
PARTS LIST
MODEL: NH60
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
808640006
808006200
808007005
503041007
502024001
000001609
808076005
000072508
000002105
508002104
808081003
625102008
508039007
000111500
808603007
808008006
842637006
842638007
840036025
000003508
000125105
842090001
842096007
842091002
844036027
842092003
000078319
808015006
827088009
820373003
678084007
808074003
000111902
808009007
000036500
673022002
000070609
000013903
000072003
000101404
808010001
508607105
508007109
508503007
846200008
822330004
000105501
808011002
000177205
508509003
844038018
808606000
845002005
843502602
000101105
000103808
830057021
843625004
808605009
000053008
000081005
102408089
660509008
660806008
832523007
660106001
Presser bar base plate (unit)
Presser bar base plate
Thread tension release lever
Thread tension release spring
Presser foot lifter
Snap ring E-5
Presser bar spring adjusting plate
Washer 4
Snap ring E-3
Presser bar
Presser bar spring
Washer
Presser bar supporter
Hexagonal socket screw 4x8
Needle bar supporter (unit)
Needle bar supporter
Threader shaft (unit)
Threader plate (unit)
Threader shaft
Spring pin 2x8
Guide pin E-2x16-CH
Threader shaft spring
Threader lever spring
Threader guide plate
Threader lever plate
Threader lever
Setscrew 3x6
Zigzag width rod
Zigzag width rod spring
Setscrew 2x3
Eccentric pin
Washer
Hexagonal socket screw 3x4
Supporter adjusting plate
Washer FT60
Spring washer
Washer 6
Snap ring CS-5
Washer 5
Setscrew 4x6
Supporter guide plate
Needle bar (unit)
Needle bar
Needle clamp (unit)
Needle bar thread guide
Thread guide plate
Setscrew 1.6x2.5 (1)
Threader position set plate
Hexagonal socket screw 4x4
Needle bar connecting stud (unit)
Needle bar supporter spring
Buttonhole sensor (unit)
Sensor set plate
Printed circuit board E1 (unit)
Setscrew 3x4
Setscrew 3x5
Buttonhole lever guide
Buttonhole lever (unit)
Zigzag width motor (unit)
Cord binder
Setscrew 4x8
Needle HA1-14
Presser foot (unit)
Presser foot holder (unit)
Zigzag foot (unit)
Setscrew
Page 38
38
MODEL: NH60
PARTS LIST
1
2
3
23
24
26
27
28
28
25
36
29
30
31
32
33
34
35
37
14
14
38
40
41
39
43
44
45
14
46
42
47
48
28
25
49
50
4
5
16
19
10
15
11
7
7
6
10
8
19
17
21
12
14
9
13
18
22
20
Page 39
KEY PARTS
NO. NO. DESCRIPTION
39
PARTS LIST
MODEL: NH60
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
808632005
808629009
808634018
808027001
508021006
000004200
000038502
508054008
820166001
000111201
808028002
751150005
808026000
000101105
808029003
000115009
808110002
508020005
000111108
753183025
820161006
686035008
000002507
732034003
000081005
809042005
000115607
000101703
808613000
808030007
808031008
000071013
000116103
823038002
808033000
000014409
808096001
808034001
808035002
000004004
625508204
000004107
808094009
000001609
000013501
808509105
808013004
000110406
627569106
102261000
Hook race (whole unit)
Hook race (unit)
Lower shaft (unit)
Lower shaft
Upper shaft gear
Spring pin 3x18
Washer
Shaft fixing metal
Lower shaft ring
Hexagonal socket screw 4x4
Feed fork
Actuator plate
Feed fork spring
Setscrew 3x4
Feed cam
Setscrew TP 3x8
Lower gear
Ring
Hexagonal socket screw 4x6
Feed lifting cam
Feed lifting pin
Feed lifting cam spring
Snap ring E-4
Lower shaft bushing
Setscrew 4x8
Lower shaft bushing set plate
Setscrew TP 4x8
Setscrew 4x12
Feed motor (unit)
Feed motor set plate
Feed regulator shaft supporter
Washer 4
Spring washer 4
Setscrew
Feed regulator shaft
Snap ring CS-8
Feed regulator shaft spring
Feed regulator shaft
Feed regulator
Spring pin 2.5x10
Feed regulator (unit)
Spring pin 3x14
Feed regulator spring
Snap ring E-5
Snap ring CS-12
Stepping motor (unit)
Gear
Hexagonal socket screw 3x4 (WP)
Bobbin holder (unit)
Bobbin
Page 40
40
MODEL: NH60
PARTS LIST
13
17
14
15
16
18
23
22
19
21
24
25
27
26
20
28
29
31
32
30
27
35
34
37
28
33
33
1
4
2
3
5
6
7
8
9
10
11
12
36
28
43
43
42
28
39
40
42
41
28
38
Page 41
KEY PARTS
NO. NO. DESCRIPTION
41
PARTS LIST
MODEL: NH60
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
808626006
808067003
808068004
000163703
502015009
000015503
502016000
502202005
000130206
508116009
820390109
846271103
808614001
808038005
625217100
000002806
000115607
808615002
808039006
508507001
000001609
508111004
000120203
856512100
000081706
808040000
000013903
000081005
808617004
808502005
000115700
808639301
000103509
808504007
808093101
000188209
000188405
808618005
808077006
808078100
808079008
808080002
000002105
Needle plate (unit)
Needle plate
Support needle plate
Setscrew 2x3.5
Spring
Snap ring SC-2.4
Hook cover plate release button
Supporter plate
Setscrew 1.7x2.5 (B)
Nut
Setscrew
Hook cover plate
Idler (unit)
Idler set plate
Idler
Snap ring E-6
Setscrew TP 4x8
Bobbin winder (unit)
Bobbin winder set plate
Bobbin winder arm (unit)
Snap ring E-5
Clutch lever
Setscrew 3x8 (B)
Switch (unit)
Setscrew 2.5x5
Spring
Snap ring CS-5
Setscrew 4x8
DC motor (unit)
DC motor (unit)
Setscrew TP 4x10
Switching regulator (unit)
Setscrew 4x10
Printed circuit board P (unit)
Cord guide
Nylon clip ACC-1.5
Nylon clip ACC-2
Presser foot pressure adjustment (unit)
Presser foot pressure adjusting set plate
Presser foot pressure dial
Adjusting arm 1
Adjusting arm 2
Snap ring E-3
Page 42
42
MODEL: NH60
PARTS LIST
1
5
2
3
4
6
7
8
9
12
10
11
14
13
13
19
13
13
20
15
16
17
18
10
10
13
13
Page 43
KEY PARTS
NO. NO. DESCRIPTION
43
PARTS LIST
MODEL: NH60
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
808619604
808050508
827503108
000162001
650503403
000014409
502007008
502008009
000120203
739064003
502009000
808132000
000081005
822020503
808622127
808060213
840602006
000104108
808061007
808508001
Rear cover (unit)
Rear cover
Top cover thread guide (unit)
Setscrew 2.6x5
Thread guide (unit)
Snap ring CS-8
Spool pin
Spool pin support plate
Setscrew 3x8 (B)
Bed rubber cushion
Carrying handle
Carrying handle supporter
Setscrew 4x8
Spool holder
Face plate (unit)
Face plate
Thread cutter (unit)
Setscrew 4x20
Free arm cover
Extension table (unit)
Page 44
44
MODEL: NH60
PARTS LIST
1
2
3
6
8
9
10
11
13
7
13
13
14
15
16
17
18
19
24
25
26
23
20
22
21
27
27
28
29
30
33
30
34
30
31
32
32
32
5
12
4
Page 45
KEY PARTS
NO. NO. DESCRIPTION
45
PARTS LIST
MODEL: NH60
808630081
808051495
808072056
808114006
808103002
808071103
808054100
808055008
808056102
000160700
808710994
808121006
000120203
808058104
808070102
808507000
000014306
808506009
808057000
735016307
000101828
000071013
000061102
639005003
000201405
000160102
739064003
000115205
000160401
000081005
808059301
000149312
639080002
808016007
Front cover (unit)
Front cover
Panel
Double-stick sheet
Front cover lid
Button 1
Button 2
Slide volume
Slide volume set plate
Setscrew 2.6x6 (B)
Printed circuit board A (unit)
Flame retardant insulating paper
Setscrew 3x8 (B)
Start/stop button
Button 4
Printed circuit board F (unit)
Snap ring CS-3
Printed circuit board L (unit)
Lamp holder
Bobbin winder stopper
Setscrew 4x16
Washer
Nut 4-1-7
Rubber foot
Setscrew TP 4x16
Adjustable lock nut 4
Bed rubber cushion
Setscrew TP 4x6
Setscrew 4x16 (B)
Setscrew 4x8
Bed cover
Setscrew 3x8
Front cover set plate
Arm thread guide
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
Page 46
46
MODEL: NH60
PARTS LIST
1
2 3
6
7
8
9
10
11
15
16
18
12
13
14
19
17
4
5
Page 47
KEY PARTS
NO. NO. DESCRIPTION
47
PARTS LIST
MODEL: NH60
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
808870007
822804118
829801002
825817009
822801001
102261000
639804000
653802002
802424004
647808009
822019509
829803004
625031500
102403109
753801004
856519004
C-1036
808800109
741811000
Attachment (unit)
Satin foot (unit)
Zipper foot (unit)
Blind hem foot (unit)
Overedge foot (unit)
Bobbin
Needle set (unit)
Screw key
Lint brush
Seam ripper (Buttonhole opener)
Spool holder
Spool stand
Spool pin
Felt
BH foot (unit)
Power supply cord
Foot control
Instruction book
Cover
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