New Home NH60 Guía de solución de problemas

SERVICE MANUAL

PARTS LIST

MODEL: NH60

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

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

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.

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)

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.

LCD DISPLAY

The LCD display shows the following information when the machine is turned on.

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.

we r

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

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

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

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)

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