Bernina 430 Instruction Manual Page 58
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58
Trouble shooting
Trouble shooting
In most cases you will be able to identify and remedy faults by checking the following.
Check whether:
• the upper and lower threads are threaded correctly
• the needle is inserted correctly with the flat side to the back
• the needle size is correct – check the needle/thread table on p. 18
• the needle tip and shaft are undamaged
• 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
Fault
Uneven stitch
formation
Skipped stitches
Upper thread
breaks
Lower thread
breaks
Needle breaks
Sewing computer
fails to run or runs
slowly
Embroidery process
is interrupted or can
not be started
Thread is caught in
the area of the
take-up lever
Cause
Upper thread too tight/too slack
Lower thread too tight/too slack
Poor quality needle
Needle inserted incorrectly
Poor quality thread
Needle/thread combination is incorrect
Incorrectly threaded
Incorrect needle system
Needle bent or blunt
Poor quality needle
Needle inserted incorrectly
Incorrect needle point
Upper thread tension too tight
Incorrectly threaded
Poor quality or old thread
Stitch plate or hook tip damaged
Lower thread tension too tight
Stitch hole in the stitch plate has been
damaged
Needle blunt or bent
Needle not correctly inserted
Fabric was pulled
Fabric was pulled when thick material
used
Poor quality thread, unevenly wound or
knotted
Plug not properly inserted
Sewing computer is not running at room
temperature
Sewing computer is not switched on
e.g. upper thread broken, feed-dog not
lowered etc.
Embroidery software or EC on PC can not
be installed
Upper thread breaks
Repair
Reduce/increase upper thread tension
Reduce/increase lower thread tension
Use a needle with flat side of the shank to the back
The flat side of the shank must be to the back
Use quality threads (Isacord, Mettler, Gütermann)
Match the needle to the thread size
Check upper thread threading path/lower thread threading path
Use needle system 130/705 H
Use good quality needles
Use new, good quality needles (BERNINA).
Insert needle as far as it will go
Match the needle type to the fabric
Reduce upper thread tension
Check upper thread threading path
Use good quality thread
Have the sewing-/embroidery computer checked by a dealer
Reduce lower thread tension
Have the sewing-/embroidery computer checked by a dealer
Use a new needle
Tighten the needle clamp screw
Do not pull the fabric during sewing
Use the correct presser foot for thick material (e.g. Jeans foot
No. 8)
Use height compensating tool when sewing over a thick seam
Use quality thread
Insert plug properly
Use sewing computer at room temperature
Switch sewing computer on (to «I»)
Follow the animated recommendations in the display
Ask your BERNINA dealer
If the lower thread breaks and the thread is trapped in the area
of the take-up lever, proceed as follows:
• power switch to «0» (off)
• remove the screw on the head frame with the angular Torx key
• pull head frame to the left
• remove remnants of thread
• attach head frame and tighten screw
032907.52.04_0910_a430/a440/a450_EN
- WARNING 2
- SERVICING DOUBLE 2
- INSULATED 2
- PRODUCTS 2
- Applications 30 - 56 3
- Display 23 - 29 3
- Index 84 - 85 3
- Key to signs 4
- Accessories 5
- Reinforced soft cover 6
- Front view 8
- Back view 8
- Power switch / Power cable 10
- Foot control 10
- CFL Sewing Light 11
- Slide-on table 11
- Threading the upper thread 12
- Threading the Double Needle 13
- Thread cutter 14
- Supplementary spool pin 14
- Needle threader 14
- Inserting the bobbin 15
- Winding the bobbin 15
- Changing the needle 16
- Bobbin case* 16
- Thread tension 17
- Changing the presser foot 17
- Needle/thread combination 18
- Needle summary 19
- Feed dog 20
- Stitch plate 20
- Feed dog and sewing corners 21
- Presser foot pressure 22
- Function buttons 24
- Functions 25
- Functions - Memory 26
- Corrections in Memory 29
- Stitch selection 30
- Straight Stitch 34
- Triple Straight Stitch Seam 34
- Edge stitching 35
- Darning program 36
- Manual darning 37
- Zig-zag Stitch 38
- Stretch Overlock Seam 39
- Vari-overlock seam 39
- Double overlock seam 40
- Flat Joining Seam 40
- Basting stitch 42
- Blind hem 42
- Decorative stitches 43
- Hand-look quilt stitch 44
- Freehand quilting 44
- Freehand quilting with BSR 45
- Preparation 46
- BSR foot - Application 47
- Marking buttonhole 48
- Buttonholes with cord 49
- Buttonholes 50
- Buttonhole - Balance 51
- 5 step keyhole buttonhole 53
- 4-step standard buttonhole 53
- Automatic buttonhole 54
- Button sew-on program 56
- Cleaning 57
- Trouble shooting 58
- Embroidery 59
- Standard accessories 60
- Optional accessories 61
- Attaching the module 63
- Preparing for embroidery 64
- Hooping the fabric 65
- Embroidery stabilizers 66
- Different stitch types 68
- Embroidery threads 69
- Bobbin threads 69
- BERNINA embroidery software 70
- Embroidery software 71
- Embroidery process - EC on PC 72
- Software EC on PC 73
- Functions on the display 75
- EC on PC - Functions 76
- Attaching the embroidery hoop 78
- Starting to embroider 78
- Mega-Hoop (special accessory) 79
- Embroidering borders 79
- Positioning the motif: 80
- Summary stitches 81
- 1 - 31 Practical stitches 82
- 32 - 63 Quilt stitches 82
- 64 - 180 Decorative stitches 82
- 61 - 73 Quilt stitches 83
- 09/10 EN 032 907 52 04 85
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