Janome HD-5050 Service Manual
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Janome HD-5050 Service Manual

Janome HD-5050 Service Manual

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First Edition: 20 October 2023
SERVICE MANUAL
MODEL: HD-5050

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Summary of Contents for Janome HD-5050

  • Page 1 First Edition: 20 October 2023 SERVICE MANUAL MODEL: HD-5050...

  • Page 2: Table Of Contents

    WHAT TO DO WHEN ........................1 to 3 CHANGING EXTERNAL PARTS FACE COVER ............................4 FREE-ARM COVER ..........................5 FRONT COVER ............................6 REAR COVER ............................7 MECHANICAL ADJUSTMENT PRESSER BAR HEIGHT ........................8 NEEDLE DROP POSITION ........................9 ADJUSTMENT OF HOOK TIMING .......................10 ADJUSTMENT OF NEEDLE BAR HEIGHT ..................11 CLEARANCE BETWEEN NEEDLE AND TIP OF THE ROTARY HOOK ..........12 FEED DOG HEIGHT ..........................13 FEED DOG ADJUSTMENT ........................14...
  • Page 3 WHAT TO DO WHEN Condition Cause How to fix Reference 1. Skipping 1. Needle is not inserted properly. Insert the needle properly. Stitches 2. Needle is bent or worn. Change the needle. 3. Incorrectly threaded. Rethread. 4. Needle or thread are Use the recommended sewing needle inappropriate for the fabric and thread.
  • Page 4 WHAT TO DO WHEN Condition Cause How to Fix Reference 3. Breaking 1. Initial sewing speed is Start with medium speed. upper too fast. thread. 2. Thread path is incorrect. Use the proper thread path. 3. Needle is bent or dull. Replace with a new needle. 4.

  • Page 5: What To Do When

    WHAT TO DO WHEN Condition Cause How to fix Reference 6. Noisy 1. Backlash between hook gear Eliminate the backlash. operation and lower shaft gear is too great. 2. Lower shaft gear is loose. Eliminate the looseness. 3. Inappropriate belt tension. See part removal and replacement P.

  • Page 6: Changing External Parts

    CHANGING EXTERNAL PARTS FACE COVER TO REMOVE: 1. Remove the cap q and setscrew w and lift the face cover to disengage the rib on the inside. Remove the face cover e. TO ATTACH: 2. Follow the above procedures in reverse.

  • Page 7: Free-Arm Cover

    CHANGING EXTERNAL PARTS FREE ARM COVER TO REMOVE: 1. Remove the setscrew q (2 pcs.). Move the free arm cover w to the left. Remove the free arm cover. TO ATTACH: 2. Follow the above procedures in reverse.

  • Page 8: Front Cover

    CHANGING EXTERNAL PARTS FRONT COVER TO REMOVE: 1. Remove the face cover and free arm cover (see pages 4 and 5). 2. Remove the setscrews q (2 pcs.). 3. Remove the setscrews w (2 pcs.) and base cover e. 4. Remove the setscrews r (2 pcs.) and setscrew t. 5.

  • Page 9: Rear Cover

    CHANGING EXTERNAL PARTS REAR COVER TO REMOVE: 1. Remove the face cover and free arm cover (see pages 4 and 5). 2. Remove the setscrews q (2 pcs.) and the setscrews w (3 pcs.). 3. Remove the setscrews e (2 pcs.) and base cover r. 4.

  • Page 10: Mechanical Adjustment

    MECHANICAL ADJUSTMENT PRESSER BAR HEIGHT The distance between the bottom of the presser foot in up position and the needle plate should be 6.0 mm. 1. Remove the face cover (see page 4) and needle. 2. Lower the feed dog below the needle plate. Place a block 6 mm thick under the presser foot and lower the presser foot lifter q.

  • Page 11: Needle Drop Position

    MECHANICAL ADJUSTMENT NEEDLE DROP POSITION Set the stitch pattern to “ ”. The standard needle drop position should be at center of the needle plate hole. Select zigzag stitch “ ”, and set the stitch width at “7.0”. The clearance between the needle and the edge of the needle hole should be at least 0.2 mm on either side.

  • Page 12: Adjustment Of Hook Timing

    MECHANICAL ADJUSTMENT ADJUSTMENT OF HOOK TIMING The amount of ascending travel of the needle bar from its lowest position to the position ( ) where the tip of the rotary hook exactly meets the right side of the needle should be 3.25 to 3.55 mm. 1.

  • Page 13: Adjustment Of Needle Bar Height

    MECHANICAL ADJUSTMENT ADJUSTMENT OF NEEDLE BAR HEIGHT Before proceeding with this adjustment, check the hook timing (see page 10). The distance between the upper edge of the needle eye and the upper surface of the hook race should be in the range of 1.6 to 2.0 mm when the tip of the hook meets right side of the needle in the left needle position ( ) as the needle ascends from its lowest position.

  • Page 14: Clearance Between Needle And Tip Of The Rotary Hook

    MECHANICAL ADJUSTMENT CLEARANCE BETWEEN NEEDLE AND TIP OF THE ROTARY HOOK * The clearance between the needle and the point of hook should be –0.10 to +0.05 mm. Adjustment procedure: 1. Remove the setscrews q (2 pcs.) on the needle plate. Remove the needle plate and the bobbin holder. Attach the master needle. Turn the power switch on and set the zigzag width at maximum. 2.

  • Page 15: Feed Dog Height

    MECHANICAL ADJUSTMENT FEED DOG HEIGHT The highest position of the feed dog teech should be 0.80 to 0.90 mm from the surface of the needle plate. 1. Adjust the stitch length to the maximum. 2. Lower the presser foot and turn the power switch on. 3.

  • Page 16: Feed Dog Adjustment

    MECHANICAL ADJUSTMENT FEED DOG ADJUSTMENT The highest position of the feed dog should be parallel to the surface of the needle plate. If not, adjust as follows. 1. Remove the free arm cover (see page 5). 2. Use a hexagonal socket screw (4x6) q. Insert the setscrew to the hole w.

  • Page 17: Top Tension

    MECHANICAL ADJUSTMENT TOP TENSION The top tension should be between 65 to 80 grams-force when pulling the thread up in the direction of arrow with the thread tension dial at “4”. If it is not within the above limit, adjust as follows. * Use polyester sewing thread #50 (White).

  • Page 18: Stretch Stitch Feed Balance

    MECHANICAL ADJUSTMENT STRETCH STITCH FEED BALANCE TO CHECK: 1. Enter the self-diagnostic mode (see below). Attach the satin stitch foot F. Place a fabric under the presser foot. Lower the presser foot. 2. Press the auto-lock button to start test sew, and check the results (the standard figure length of 5 pieces of figure 8 is 33 to 39 mm).

  • Page 19: Replacement And Adjustment Of The Needle Thread Plate

    MECHANICAL ADJUSTMENT REPLACEMENT AND ADJUSTMENT OF THE NEEDLE THREADER PLATE If the hook of the threader plate is damaged, change and adjust the part as follows: TO CHANGE THE THREADER PLATE: 1. Remove the needle. 2. Push down the needle threader knob and pull the threader plate supporter down to remove it (see FIG 1). 3.

  • Page 20: Adjusting Buttonhole Lever Position

    MECHANICAL ADJUSTMENT ADJUSTING BUTTONHOLE LEVER POSITION TO ADJUST THE BUTTONHOLE LEVER GUIDE: 1. Enter the diagnostic test of buttonhole sensor mode. (See page 21. The LCD should display 03 and BH symbol.) 2. Open the face cover (see page 4) and loosen the setscrew q. 3. Move the buttonhole lever guide so the BH symbol disappear when the buttonhole lever is lowered. Tighten the setscrew.

  • Page 21: Thread Cutter

    MECHANICAL ADJUSTMENT THREAD CUTTER The distance between the end of thread cutter plate slit and the edge of moving cutter should be in the range of 0.9 to 1.3 mm. TO CHECK: 1. Remove the free arm cover (see page 5). 2. Turn the power switch off. Slide the moving cutter to the right with your finger. 3.
  • Page 22 SELF-DIAGNOSTIC TEST PREPARATION: 1. Turn the power switch off. 2. Move the bobbin winder spindle to the left. 3. Raise the feed dog. 4. Set the speed control lever to the left. 5. Remove the presser foot and raise the presser foot lifter. 6.
  • Page 23 SELF-DIAGNOSTIC TEST STEP AND ITEMS TO PROCEDURE CORRECT CONDITION DEFECTIVE CONDITION CHECK Sewing lamp and LCD backlight lit. LCD Sewing lamp does not lit. Turn on the power switch while displays “01 ----”. LCD backlight does not lit. FUNCTION simultaneously pressing the LCD does not display. OF LCD, auto-lock button and needle up/ Buzzer does not sound.
  • Page 24 SELF-DIAGNOSTIC TEST STEP AND PROCEDURE CORRECT CONDITION DEFECTIVE CONDITION ITEMS TO CHECK LCD displays “SC 05--” and presser Buzzer does not sound. Raise or lower the preser foot lifter. foot symbol. The presser foot symbol PRESSER If the result is correct condition, Buzzer sounds when presser foot lifter does not appear when the FOOT press the start/stop button to...
  • Page 25 SELF-DIAGNOSTIC TEST STEP AND PROCEDURE ITEMS TO CORRECT CONDITION DEFECTIVE CONDITION CHECK Attach the foot control to the LCD displays “SC 08--”. The foot control symbol FOOT machine. does not appear. CONTROL Depress the foot control as far as Buzzer does not sound. it goes, then release it. –REMEDY–...
  • Page 26 SELF-DIAGNOSTIC TEST STEP AND PROCEDURE CORRECT CONDITION DEFECTIVE CONDITION ITEMS TO CHECK The thread cutter motor Turn the handwheel toward you to LCD displays “SC 12--”. does not work. THREAD raise the needle bar at its highest Thread cutter motor wii be Thread cutter symbol CUTTER position.

  • Page 27: Self-Diagnostic Test

    SELF-DIAGNOSTIC TEST Buzzer sounds after few seconds when the self-diagnostic test has been finished. The test result has been determined. CORRECT: Buzzer sounds and LCD displays “00” DEFECTIVE: Caution buzzer sounds and LCD displays the defective part number. See pages 21 to 24 and fix the defective part.

  • Page 28: Replacing The Electronic Components

    REPLACING THE ELECTRONIC COMPONENTS PRINTED CIRCUIT BOARD A CONNECTION NOTE: Do not disconnect the connectors by pulling on cord. To disconnect, grasp the connector, not the cord. *Auto-off timer switch is functionable only for applicable models. Bobbin winding switch (Blue) Foot control (Black) Presser foot lifter switch (Green) Switching regulator (White) BH sensor (Red) Zigzag motor (Green)

  • Page 29: Printed Circuit Board A

    REPLACING THE ELECTRONIC COMPONENTS PRINTED CIRCUIT BOARD A TO REMOVE: 1. Remove the front cover (see page 6). 2. Pull out connectors from the printed circuit board A. 3. Remove the setscrews (4 pcs.) and the printed circuit board A. TO ATTACH: 4. Follow the above procedures in reverse. NOTE: Do not disconnect the connectors by pulling on cord.

  • Page 30: Printed Circuit Board F2

    REPLACING THE ELECTRONIC COMPONENTS PRINTED CIRCUIT BOARD F2 TO REMOVE: 1. Remove the front cover (see page 6). 2. Pull out connectors from the printed circuit board A. 3. Remove the setscrews (3 pcs.) and the printed circuit board F2. TO ATTACH: 4. Follow the above procedures in reverse. NOTE: Do not disconnect the connectors by pulling on cord.

  • Page 31: Printed Circuit Board F

    REPLACING THE ELECTRONIC COMPONENTS PRINTED CIRCUIT BOARD F TO REMOVE: 1. Remove the front cover (see page 6). 2. Pull out connectors from the printed circuit board A. 3. Remove the setscrew q and LED cover. 4. Remove the setscrew w and printed circuit board F. TO ATTACH: 5.

  • Page 32: Printed Circuit Board L

    REPLACING THE ELECTRONIC COMPONENTS PRINTED CIRCUIT BOARD L2 TO REMOVE: 1. Remove the front cover (see page 6). 2. Pull out connectors from the printed circuit board A. 3. Remove the setscrew and LED cover. 4. Remove the printed circuit board L2. TO ATTACH: 5. Follow the above procedures in reverse. NOTE: Do not disconnect the connectors by pulling on cord.

  • Page 33: Driving Motor (Dc Motor)

    REPLACING THE ELECTRONIC COMPONENTS DRIVING MOTOR (DC MOTOR) TO REMOVE: 1. Remove the front cover (see page 6). 2. Remove the setscrews q (2 pcs.), setscrew w (1 pcs.), the driving motor and the belt. TO ATTACH: 3. Install the driving motor and the motor belt. Tighten them with setscrews q (2 pcs.) lightly. 4.

  • Page 34: Switching Regulator Unit

    REPLACING THE ELECTRONIC COMPONENTS SWITCHING REGULATOR UNIT TO REMOVE: 1. Remove the front cover and the rear cover (see pages 6 and 7). 2. Remove the setscrews (3 pcs.) and the switching regulator. TO ATTACH: 3. Follow the above procedures in reverse. *Auto-off timer switch connector is available only for applicable models. Auto-off timer switch connector * Setscrew Switching regulator unit...

  • Page 35: Cleaning Area Of Thread Cutter And Lower Shaft Gear

    CLEANING AREA OF THREAD CUTTER AND LOWER SHAFT GEAR Remove the dust on the area of the thread cutter and the lower shaft gear as follow. 1. Remove the free arm cover. (see page 5) 2. Clean the area of the thread cutter and the lower shaft gear. 3.

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