Janome 521 Service Manual
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Janome 521 Service Manual

Janome 521 Service Manual

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SERVICE MANUAL
MODEL 521/525S

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Summary of Contents for Janome 521

  • Page 1 SERVICE MANUAL MODEL 521/525S...

  • Page 2: Table Of Contents

    INDEX Service Access (1) Face plate ..................1 Service Access (2) Base cover ................... 2 Service Access (3) Front cover ................... 3 Service Access (4) Rear cover ..................4 Adjusting Thread Tension .................... 5 Adjusting Presser Foot Height and Alignment ............6 Adjusting Needle Swing ....................

  • Page 3: Service Access (1) Face Plate

    Service Access (1) • Face plate <To remove> Remove the cap and setscrew. Remove the face plate. <To attach> Attach the face plate with the setscrew. attach the cap. Face plate Setscrew...

  • Page 4: Service Access (2) Base Cover

    Service Access (2) • Base cover <To remove> Remove the setscrews (6 pcs.) and remove the base cover. <To attach> Shift the drop feed lever in the direction of the arrow. Attach the base cover with setscrews. Base cover Setscrew Setscrew Setscrew Drop feed lever...
  • Page 5 Service Access (3) • Front cover <To remove> Remove the face plate and base cover (see pages 1 and 2). Pull out the pattern selector dial and stitch length dial. Remove the setscrews (A), (B) and (C) (two off). Remove the front cover, unlocking all the hooks. <To attach>...

  • Page 6: Service Access (4) Rear Cover

    Service Access (4) • Rear cover < To remove> Remove the face plate, base cover and front cover (see pages 1-3). Remove the setscrews (A), (B), (C) and (D). Lower the presser foot lifter and pull away the rear cover from the machine, clearing the parts (1), (2) and (3), in this order.

  • Page 7: Adjusting Thread Tension

    Adjusting Thread Tension • The standard tension should be 75 - 90 grams measured with a white polyester thread #50 being pulled in the direction of the arrow, when the tension dial is set at "4". <To adjust> Remove the front cover (see apge 3). Set the tension dial at "4".

  • Page 8: Adjusting Presser Foot Height And Alignment

    Adjusting Presser Foot Height and Alignment • The distance between the bottom of the presser foot in up position and the needle plate should be 6.0 mm. <To adjust> Remove the face plate and needle. Lower the feed dog below the needle plate. Place a block 6 mm thick under the presser foot and lower the presser foot lifter.

  • Page 9: Adjusting Needle Swing

    Adjusting Needle Swing • If the needle swing when it is still in the fabric, correct it as follows. <To adjust> Remove the front cover (see page 3). Select the zigzag stitch ( ) and set the stitch wodth dial at 5.0. Loosen the setscrews on the worm.

  • Page 10: Adjusting Needle Drop Position

    Adjusting Needle Drop Position • The clearance between the needle and side edges of the needle hole should be 0.2 mm or more when the maximum width zigzag stitch ( ) is selecte. And the neddle should drop in the center of the needle hole when the straight stitch is selected. <To adjust>...

  • Page 11: Adjusting Needle To Hook Timing

    Adjusting Needle to Hook Timing • The amount of ascending travel of the needle in the maximum width zigzag stitch ( ) from the right lowest position should be 1.4 to 2.0 mm where the hook point meets the right side of the needle.

  • Page 12: Adjusting Needle Bar Height

    Adjusting Needle Bar Height • The standard distance between the upper edge of the needle eye and the upper surface of the hook race should be in the range of 3.0 - 3.3 mm when the hook point meets the right side of the needle in its ascending travel from the right lowest position of the maximum width zigzag stitch ( <To adjust>...

  • Page 13: Adjusting Clearance Between Needle And Hook Point

    Adjusting Clearance between Needle and Hook Point • The standard clearance between the needle and hook point should be -0.10 to +0.05 mm. <To adjust> Select the maximum width zigzag stitch ( Remove the base cover (see page 2). Remove the needle plate and bobbin holder. Replace the needle with the test pin.

  • Page 14: Adjusting Backlash Between Hook Drive Gear And

    Adjusting Backlash between Hook Drive Gear and Lower Shaft Gear • The rotary play should be 0.8 mm or less when the hook point is within the span of the feed dog, and the gears should turn smoothly. <To adjust> Remove the base cover (see page 2).

  • Page 15: Adjusting Feed Dog Height

    Adjusting Feed Dog Height • The distance between the lowered presser foot and needle plate should be 0.75 to 0.85 mm when the feed dog is in its highest position. <To adjust> Select the straight stitch ( ) and set the stitch width at "4". Lower the presser foot.

  • Page 16: Adjusting Feed Balance

    Adjusting Feed Balance The forward feeding (A) and backward feeding (B) should be equal when sewing stretch stitch pattern. <To adjust> Select the straight stretch stitch ( Place a piece of paper under the foot. Turn the handwheel to check the needle marks. Remove the cap to access the adjusting screw.

  • Page 17: Adjusting Buttonhole Feed Balance

    Adjusting Buttonhole Feed Balance • When sewing a buttonhole, the stitches on each side of the buttonhole should be the same density. The range of 9 to 12 stitches in the right side row against 10 stitches in the left side row is considered acceptable.

  • Page 18: Adjusting Buttonhole Zero Feed

    Adjusting Buttonhole Zero Feed • If the fabric is fed when sewing a bartack of the buttonhole, correct it as follows: <To adjust> Sew a test buttonhole to check if the fabric is fed while sewing the bartacks. Remove the cap to access the adjusting screw. If the fabric is fed foward (A), turn the adjusting screw in the direction (C).

  • Page 19: Adjusting Buttonhole Functions (Model525S)

    Adjusting Buttonhole Function MODEL 525S <To check> Buttonhole should be about 3mm longer than the length set by the R foot. if this length cannot be obtained, then check and adjust as follows: <To adjust> Lower the feed dog and set the R foot. Remove the face plate.

  • Page 20: Replacing Motor And Adjusting Motor Belt Tension

    Replacing Motor and Adjusting Motor Belt Tension <To replace the motor> Remove the face plate, base cover, front cover and rear cover (see pages 1 to 4). Remove the setscrews (A) and machine socket. Remove the setscrews (B) and machine socket lid.

  • Page 21: Replacing And Adjusting Threader (Model525S)

    Replacing and Adjusting Threader MODEL 525S <To replace> Remove the face plate (see page 1). Pull the threader guard away from the threader. Align the groove on the threader guide with the pin on the threader shaft and push the threader guide up to snap it in place.

This manual is also suitable for:

525s

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