Janome 4900 QC manual Troubleshooting, Condition Cause Reference

Page 88

Troubleshooting

Condition

 

Cause

Reference

The needle thread

1. The needle thread is not threaded properly.

See page 21

breaks.

2.

The needle thread tension is too tight.

See page 24

3.

The needle is bent or blunt.

See page 16

 

 

4.

The needle is incorrectly inserted.

See page 16

 

5.

The needle thread and the bobbin thread are not set under the

 

 

 

presser foot when starting sewing.

See page 25

 

6.

The threads are not drawn to the rear after sewing.

See page 82

 

7.

The thread is either too heavy or too fine for the needle.

See page 17

 

 

 

 

The bobbin thread

1.

The bobbin thread is not threaded properly in the bobbin holder.

See page 20

breaks.

2.

Lint has collected in the bobbin holder.

See page 82

 

 

3.

The bobbin is damaged and doesn't turn smoothly.

Exchange bobbin.

 

 

 

 

The needle breaks.

1.

The needle is incorrectly inserted.

See page 16

 

 

2.

The needle clamp screw is loose.

See page 16

 

3.

The threads are not drawn to the rear after sewing.

See page 25

 

4.

The needle is too fine for the fabric being used.

See page 17

 

 

 

Skipped stitches

1. The needle is bent, blunt or incorrectly inserted.

See page 16

 

2.

The needle and/or fabrics are not suitable for the work being

 

 

 

sewn.

See page 17

 

3.

A Blue Tip needle is not being used when sewing stretch, very

 

 

 

fine fabrics or synthetics.

See page 17

 

4.

The needle thread is not threaded properly.

See page 21

 

5.

A poor quality needle is being used.

Change the needle.

 

 

 

Seam puckering

1. The needle thread tension is too tight.

See page 24

 

2.

The needle thread is not threaded properly.

See page 21

 

3.

The needle is too heavy for the fabric being sewn.

See page 17

 

4.

The stitch length is too long for the fabric.

Make the stitch coarser

 

 

 

 

The cloth is not

1.

The feed dog is packed with lint.

See page 78

2.

The stitches are too fine.

Make the stitch coarser.

feeding smoothly.

3.

The feed dog is not raised after "drop feed" sewing.

See page 14

 

 

 

 

 

Stitches form loops

1.

The needle thread tension is too loose.

See page 24

2.

The needle is either too heavy or too fine for the thread.

See page 17

below the fabric.

 

 

 

 

 

 

The machine does not

1. The machine is not plugged in.

See page 6

2.

Thread has been caught in the hook race.

See page 82

work.

3.

The bobbin winder spindle is not returned to the left after bobbin

 

 

 

 

 

winding.

See page 19

 

 

 

 

Buttonhole is not sewn

1.

The stitch density is not suitable for the fabric being sewn.

See page 43

2. A suitable interface material has not been used for stretch or

 

properly.

 

synthetic fabric.

See page 17

 

 

 

 

The machine does not

1.

Thread has been caught in the hook race.

See page 82

run smoothly and is

2.

Lint has built up in the hook race or bobbin holder.

See page 82

noisy.

 

 

 

 

 

 

 

8 6

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Contents Page Important Safety Instructions Table of Contents Table of Contents Name of Parts Name of partsStandard Accessories Attaching the table Detaching the tableFree-arm sewing can be used for To use start/stop button Connecting the Power SupplyTo use foot control Foot control Speed control sliderOperating Instructions Start/stop button Reverse stitch buttonAuto-lock button Up/down needle position buttonScreen brightness adjustment dial Mode key seeMonogramming key see Stock/Call key see page 294Stitch width adjustment key see page 28, 29 5Stitch length adjustment key see page 28, 296Function touchpad see 7Clear key seeMode selection Mode 1 Screen indicationMode 2 Monogramming modeMode Pattern selection and screen indication Mode 2, 3 and MonogrammingPattern Selection Example stitch patternResumption setting Sound settingLanguage setting Window duration time settingPressure dial To drop or raise the feed dogPresser foot lifter Changing the presser foot To remove and attach the foot holderKnee Lifter To removeChanging the needle Thread and Needle Chart Needle SizeBobbin Winding Setting the spool of threadRemoving the bobbin Additional spool pin y Spool Inserting the bobbin Threading the machine Built-in needle threader Drawing up bobbin thread Manual thread tension adjustment Balancing thread tensionAuto-thread tension Balanced thread tensionMachine settings Straight stitchChanging sewing direction Securing a seamUsing the quilting guide Using the seam guides on the needle plateTurning a square corner Sewing on heavy fabricHelp button Adjusting the needle drop position Adjusting the stitch lengthRestoring the original settings Example To change the preset value for the stitch lengthBasting Attaching the darning foot PTriple stretch stitch Lock-a-Matic stitchStretch stitch Saddle stitch Locking stitchNew sculpture stitch French knot Decorative stitchProgramming French knots Example Combination of patterns 54 Adjusting the stitch length Adjusting the stitch widthZigzag stitch Types of Overcasting Stitches Overcasting with zigzag stitchMultiple zigzag stitch Tricot stitch Overcasting stitchDouble overedge stitch Knit stitchOverlock stitch Attaching the button sewing foot T Button sewingTo sew Variations of Buttonholes Square Buttonhole Round-end ButtonholeFine Fabric Buttonhole Keyhole ButtonholeSquare buttonhole Pull the buttonhole lever down as far as it will go Start the machine to sew the buttonhole Double layer buttonhole Corded buttonholeAdjusting buttonhole width Adjusting stitch densityAdjusting buttonhole width on stitch pattern #18 Adjusting buttonhole width on stitch pattern #20Round-end buttonholes #18 Keyhole buttonholes #20Knit buttonhole #24 Faux chain buttonhole #25Welted buttonhole Page ⁄2t Eyelet Zipper sewing Fabric preparationFold back the left seam allowance. Turn the right Page Darning To adjust the evenness of darning To sew a shorter darningTo sew the same size darning To sew the darning at a different sizeTacking To sew a shorter tackTo sew the same size tack To sew a tack at a different sizeBlind hem How to fold the fabricChanging needle drop position EPintucking QuiltingShell tuck AppliqueSmocking FagotingScallop a Scallop BPatchwork Satin stitchCording Rolled hemStrand cording Cross stitch Twin needle sewing Pattern combination Example Programming patterns 33, 35 Combinations for a mirror image Pattern Elongation Extender stitches Free-motion quilting Editing program Combining satin and decorative stitches Custom stitch adjustment Mode 2 and 3 only Programming a monogram Programming a monogram Reducing the size of a monogram Editing the programmed patterns Deleting a letter character Viewing a long textExample To delete C from Abcd Inserting a letter character Duplicating a patternExample To insert a space between B and C in Abcd To duplicate the stitch patternOverwriting a stored combination To store and call stitch pattern combinationsTo stock memory Recalling a stored combination Deleting a stored combinationCorrecting distorted stitch patterns Stretch stitch patternLetters and numbers ExampleCleaning the hook race and feed dog Inserting the bobbin holder Replacing the light bulb on the underside of the sewing arm Replacing the light bulb To replace Message Problem/Cause Try this Beep sounds during Audible SignalsPip Normal operation Troubleshooting Condition Cause Reference
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