Summary of 5030
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Service manual model:5030 81030dc 5050 81050dc 5100 81100dc n 2000 dc3100
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Index what to do when .......................................................................................................................... 1-3 changing external parts face cover .......................................................................................................................
Page 3: What To Do When
1 condition cause how to fix reference 1. Skipping stitches 1. Needle is not inserted properly. 2. Needle is bent or worn. 3. Incorrectly threaded. 4. Needle or thread are inappropriate for the fabric being sewn. 5. Sewing on stretch fabric. 6. Inappropriate needle bar height. 7. Inappropriate needl...
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2 condition cause how to fix reference 3. Breaking upper thread. 1. Initial sewing speed is too fast. 2. Thread path is incorrect. 3. Needle is bent or dull. 4. Top tension is too strong. 5. Needle size is inappropriate for fabric. 6. Needle eye is worn. 7. Needle hole in needle plate is worn or bur...
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3 condition cause how to fix reference 6. Noisy operation 1. Backlash between hook gear and lower shaft gear is too great. 2. Lower shaft gear is loose. 3. Inappropriate belt tension. 4. Not enough oil. 5. Upper shaft gear is loose. Eliminate the backlash. Eliminate the looseness. See part removal a...
Page 6: Changing External Parts
4 changing external parts face cover to remove: 1. Remove the cap and setscrew q and lift the face cover to disengage the rib on the inside. Remove the face cover w. To attach: 2. Follow the above procedures in reverse. Q w.
Page 7: Changing External Parts
5 free-arm cover to remove: 1. Remove the setscrew q and w. Move the free-arm cover e to the left. Remove the free-arm cover. To attach: follow the above procedures in reverse. Changing external parts q w e.
Page 8: Changing External Parts
6 changing external parts front cover to remove: 1. Remove the face cover and free-arm cover (see page 4 and 5). 2. Remove the setscrews q (2 pcs.). 3. Remove the setscrews w (4 pcs.), back cover e. 4. Remove the setscrews r (2 pcs.). 5. Loosen the setscrew t. 6. Disengage the front cover and rear c...
Page 9: Changing External Parts
7 changing external parts rear cover to remove: 1. Remove the face cover and free-arm cover (see page 4 and 5). 2. Remove the setscrews q (2 pcs.) and the setscrews w (3 pcs.). 3. Remove the setscrews e (4 pcs.) and back cover r. 4. Remove the setscrews t (2 pcs.). 6. Disengage the front cover and r...
Page 10: Mechanical Adjustment
8 6.0 mm 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 plate and needle. 2. Lower the feed dog below the needle plate. Place a block 6 mm thick under the presser foot and lower the...
Page 11: Mechanical Adjustment
9 0.2 mm or more 0.2 mm or more a = b 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 o...
Page 12: Mechanical Adjustment
10 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. Remove the needle plate and bobbin holder. 2. Turn the power switch on. 3. Select the pattern (le...
Page 13: Mechanical Adjustment
11 before proceeding with this adjustment, check the hook timing (refer to page 10). The distance between the upper edge of the needle eye and the tip of the hook should be in the range of 1.6 to 2.0 mm when the tip of the hook timing meets right side of the needle in the left needle position ( ) as...
Page 14: Mechanical Adjustment
12 adjustment procedure: 1. Remove the needle plate and bobbin holder. Attach the master needle. Turn the power switch on and set the zigzag width at maximum. 2. Remove the face cover. (see page 4.) 3. Loosen the setscrews q (2 pcs.). 4. Turn the handwheel toward you. Adjust the clearance between th...
Page 15: Mechanical Adjustment
13 the highest position of the feed dog should be between 0.80 and 0.90 mm from the surface of the needle plate. 1. Lower the presser foot and turn the power switch on. 2. Turn the handwheel toward you to set the feed dog at the highest position. 3. Remove the free-arm cover. (see page 5.) 4. Loosen...
Page 16: Mechanical Adjustment
14 mechanical adjustment top tension the top tension should be between 65 and 80 g when pulling the thread up in the direction of arrow. * use polyester sewing thread #50 (white). * if it is not within the above limit, adjust as follows. 1. Set the tension dial “4”. 2. Remove the face cover and fron...
Page 17: Mechanical Adjustment
15 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 locking stitch button to start test sew, and check the results (the standard figur...
Page 18: Mechanical Adjustment
16 x threader plate supporter threader positioning plate fig. 3 pin adjustment of left or right direction threader plate nut w view from "x" q vertical adjustment fig. 2 replacement and adjustment of the needle threader plate if the hook of the threader plate is damaged, change and adjust the part a...
Page 19: Mechanical Adjustment
17 bh sensor 1.6 mm gap to enter adjusting mode mechanical adjustment adjusting buttonhole lever position to adjust the buttonhole lever guide: 1. Enter the diagnostic test of buttonhole sensor mode. (see pages 18 and 19. The lcd should display 03 and bh symbol.) 2. Remove the face cover (see page 4...
Page 20: Self-Diagnostic Test
18 to enter self-diagnostic mode: 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. Turn the hand wheel toward you to raise the ...
Page 21: Self-Diagnostic Test
19 lcd displays “sc 04--”. When the bobbin winder spindle is moved to the right, buzzer sounds and lcd displays the bobbin symbol. When the bobbin winder spindle is moved to the left, buzzer sounds and bobbin symbol disappear. Correct condition sewing lamp and lcd backlight lit. Lcd displays “01 ---...
Page 22: Self-Diagnostic Test
20 correct condition step and items to check 05) presser foot lifter switch procedure defective condition turn the handwheel toward you. Lower the needle bar from its highest to lowest position. Raise the needle bar from its lowest position to highest position. If the result is correct condition, pr...
Page 23: Self-Diagnostic Test
21 correct condition lcd displays “sc 08--”. Step and items to check 08) foot control procedure attach the foot control to the machine. Depress the foot control as far as it goes, then release it. If the result is correct condition, press the start/stop button to proceed the next step. If the result...
Page 24: Self-Diagnostic Test
22 correct condition step and items to check 13) eeprom procedure defective condition self-diagnostic test lcd displays “ok” or “ng”, depending on the eeprom condition. If the result is correct condition, press the start/stop button to proceed the next step. If the result is defective condition, pre...
Page 25: Self-Diagnostic Test
23 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. Refer to pages 19-22 and fix the def...
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24 printed circuit board a connection note: do not disconnect the connectors by pulling on cord. To disconnect, grasp the connector, not the cord. Replacing the electronic components printed circuit board a printed circuit board f1 printed circuit board f2 printed circuit board l bobbin winding swit...
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25 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 screws (4 pcs.) and the printed circuit board a. To attach: 1. Follow the above procedures in reverse. Note: do not disconnect the connectors by pulli...
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26 printed circuit board f2 connector (black) 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 screws (3 pcs.) and the printed circuit board f2. To attach: 1. Follow the above procedures in reverse. No...
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27 printed circuit board f2 led cover connector (white) printed circuit board f1 to remove: 1. Remove the front cover. (see page 6.) 2. Pull out connectors from the printed circuit board a. 3. Remove the screws (2 pcs.) and led cover. 4. Remove the printed circuit board f2. To attach: 1. Follow the ...
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28 connector (blue) printed circuit board l to remove: 1. Remove the front cover. (see page 6.) 2. Pull out connectors from the printed circuit board a. 3. Remove the screw and led cover. 4. Remove the printed circuit board l. To attach: 1. Follow the above procedures in reverse. Note: do not discon...
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29 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: 1. Install the driving motor and the motor belt. Tighten them with setscrews q (2 pcs.) lightly. 2. Move the motor up or...
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30 switching regulator unit to remove: 1. Remove the front cover and the rear cover. (see pages 6 and 7.) 2. Remove the setscrews q (3 pcs.) and the switching regulator. 3. Remove the setscrews w (4 pcs.). To attach: 4. Follow the above procedures in reverse. Replacing the electronic components swit...