Bernina 730 Instruction Manual download pdf (Page 188)

186 Sewing and Sewing Computer Support – Trouble Shooting

Trouble Shooting

Check whether:

•

the upper and lower threads are threaded

correctly

• the needle is inserted as far up as possible with

the flat side of the shank to the back

• the needle size is correct – check the needle/

thread chart on page 18

• the sewing computer is clean – brush out any

thread lint

• the hook race is clean

• any threads are trapped between the tension

discs or under the bobbin case spring

Upper Thread Breaks

Possible Faults:

• upper thread tension is too tight

• needle is of inferior quality; purchase needles at

your authorized BERNINA dealer

• needle has been inserted incorrectly – the flat

side of the shank must be to the back

•

needle is bent or blunt

• poor quality, knotted, old or dried out thread

has been used

Possible Solutions:

• use the correct spool disc

• stitch plate hole or hook tip damaged – take

your sewing computer to your BERNINA dealer

Lower Thread Breaks

•

the lower thread tension is too tight

• the bobbin is jammed in the bobbin case:

• Remove and replace the bobbin

•

the hole in the stitch plate has been damaged

by the needle:

• this must be polished by an authorized

BERNINA service technician

• the needle is blunt or bent

Calibration of the Display

To open the calibration screen directly, proceed as

follows:

•

press both needle position buttons on the body

simultaneously and keep them pressed

• turn on the sewing and embroidery computer

•

as soon as the calibration screen is opened,

release the two buttons

•

Calibration of the Display see page 169

Skipped Stitches

•

wrong needles used:

• use only 130/705H system

• Needle is blunt, bent or incorrectly inserted:

• Push right to the top when inserting

• needle is of inferior quality or badly polished

• the needle point does not suit the fabric being

sewn; if necessary, use a ball point for knitted

fabrics and a cutting point for hard leather

• for narrower stitches use a stitch plate with

smaller stitch plate hole (5.5mm, optional

accessory)

Needle Breaks

• needle clamp screw loose

• fabric pulled to the front instead of behind the

presser foot

•

when sewing over thick area, the fabric was

pushed with the needle still in the fabric; use

Jeans foot No. 18

• for more information regarding Needle see

page 19

Faulty Stitching

•

remnants of thread between the tension discs:

• pull folded, thin fabric (do not use fabric edge)

between the tension discs and clean them by

moving the fabric forwards and backwards on

the left and right side of the thread tension

• remove remnants of thread under the bobbin

case spring

• incorrect threading. Check upper and lower

threads

• use the correct spool disc

• clean and lubricate hook (use only original oiler;

see Cleaning and Lubricating page 185)

Cannot Sew Thick Fabric

• needle/thread combination is not correct (the

thread is too thick for the inserted needle)

• use height compensating tool, when sewing

over a thick seam

Sewing Computer Fails to Run or Runs Slowly

• plug not fully inserted

•

turn power switch off («0»)

• sewing computer has been standing in a cold

room

•

restart sewing computer

Sewing Computer Sews in Reverse

•

Continuous Reverse Sewing function is activated

Prevention and Remedy of Failures

In most cases you will be able to identify and remedy faults by checking the following.

032131.70.04_0509_a730_EN

1 2 ... 183 184 185 186 187 188 189 190 191 192 193 ... 284 285

Comments to this Manuals

No comments

Bernina 730 Instruction Manual Page 188

Comments to this Manuals

Related products and manuals for Sewing machines Bernina 730