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SERVICE MANUAL

PARTS LIST

DC1050

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Summary of Contents for DC1050

Page 1: ...SERVICE MANUAL PARTS LIST DC1050...

Page 2: ...ustment of Hook Timing 11 Replacing Hook 12 Adjustment of Needle Bar Height 13 Clearance between Needle and Tip of Hook Rotary 14 Feed Dog Height 15 Top Tension 16 Replacing the Electronic Components...

Page 3: ...dle and thread Use a HA x 11 blue tip needle See mechanical adjustment Needle bar height See mechanical adjustment Ad justment of hook timing See mechanical adjustment Clearance between needle and tip...

Page 4: ...bin thread 1 Bobbin holder is incorrectly threaded 2 Too much thread is wound on the bobbin 3 Lint is stuck inside the bobbin holder 4 Thread quality is too low 5 Thread is jamming around the bobbin h...

Page 5: ...5 Upper shaft gear is loose 6 Hook is BROKEN oR TOO WORN Eliminate the backlash Eliminate the looseness See part removal and replacement driving motor DC motor Oil all moving parts Eliminate the loose...

Page 6: ...anging External Parts Face cover To remove 1 Loosen the 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...

Page 7: ...5 Free arm cover To remove 1 Loosen 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: ...move the setscrews B w 5 pcs back cover e 4 Remove the setscrews C r 2 pcs 5 Loosen the setscrew t 6 Disconnect all the connectors from the circuit board A NOTE Do not disconnect the connectors by pul...

Page 9: ...7 Changing External Parts Front cover 2 1 Disengage the front cover and rear cover hooks 2 Remove the front cover To attach Follow the above procedures in reverse...

Page 10: ...e cover and free arm cover See page 4 and 5 2 Remove the setscrews A q 4 pcs 3 Remove the setscrews B w 5 pcs and back cover 4 Remove the setscrews C e 2 pcs Remove the rear cover To attach 5 Follow t...

Page 11: ...he feed dog below the needle plate Place a block 6 mm thick under the presser foot and lower the presser foot lifter w 3 Loosen the setscrew q Raise the presser foot lifter and tighten the setscrew q...

Page 12: ...The clearance between the needle and the edge of the needle hole should be at least 0 2 mm on either side If not adjust as follows 1 Turn the power switch off Remove the face cover See page 4 2 Loose...

Page 13: ...heel toward you to lower the needle at its lowest position 5 Loosen the hexagonal socket screw w 2 pcs 6 Move the needle bar 3 4 mm from the lowest position 7 Turn the lower shaft gear until the tip o...

Page 14: ...SHAFT WASHERS D E AND F WASHERS D ARE TRANSPARENT WASHER E HAS A PROJECTION ON ITS EDGE INSERT THE PROJECTION IN THE GROOVE OF THE GEAR WHEN ATTACHING 7 REMOVE THE HOOK FROM THE HOOK RACE DO NOT REMOV...

Page 15: ...lect the pattern left position Set the zigzag width at 0 4 Turn the handwheel toward you until the tip of hook meets the right side of the needle 5 Loosen the hexagonal socket screw q 6 Move the needl...

Page 16: ...within 0 1 to 0 05 mm at the left and right needle position 5 Tighten the setscrew A 2 pcs 6 Attach the face cover Remove the master needle Attach the bobbin holder and needle pate 7 Check the clearan...

Page 17: ...e highest position 3 Remove the free arm cover 4 Loosen the setscrew q and nut w 5 Adjust the feed dog height by turning the adjusting screw e The highest position of the feed dog should be between 0...

Page 18: ...e above limit adjust as follows 1 Set the tension dial 4 2 Remove the cover 3 Lower the presser foot If the top tension is too loose turn the lead screw in the direction A If the top tension is too ti...

Page 19: ...ircuit board A Printed circuit board F Printed circuit board L q Printed circuit board P Black w Feed motor White e Bobbin winding switch Blue r Power switch White t Zigzag width motor Green y Printed...

Page 20: ...rectly to the test you want to perform Enter self diagnostic mode then select the step number of the diagnostic test you require by pressing the start stop button To begin Turn on the switch if any of...

Page 21: ...nd LCD displays BH symbol When the buttonhole lever is pushed buzzer sounds and LCD displays BH symbol BH symbol Bobbin symbol If the result is correct con dition press the start stop button to procee...

Page 22: ...he feed motor Replace the circuit board A 06 Upper shaft positioning sensor 07 Zigzag motor Step motor Feed motor Turn the handwheel toward you Lower the needle bar from its highest to its lowest posi...

Page 23: ...result is defective condition press the reverse stitch button to proceed the next step 09 Slide volume Press the needle up down button If the result is correct condition press the start stop button to...

Page 24: ...o page 19 21 and fix the defective part The defective part number See page 23 25 Steps and items section Turn the power switch off when the self diagnostic test is finished To display the version of t...

Page 25: ...everse NOTE Do not disconnect the connectors by pulling on cord To disconnect grasp the connector not the cord Replacing the Electronic Components Cirucit board F connector Setscrews Cirucit board A S...

Page 26: ...switch on while simultaneously pressing left cursor button and the right cursor button 2 After the buzzer sounds press the lcoking stitch button q within 2 5 seconds The LCD should displays S If not p...

Page 27: ...r belt Tighten them with setscrews 2pcs lightly 2 Move the motor up or down to adjust the motor belt tension The belt should deflect 5 mm when applying 200 grams of load to the middle of the belt Tigh...

Page 28: ...e the setscrews B 4 pcs To attach 4 Follow the above procedures in reverse Replacing the Electronic Components SWITCHING REGULATOR SETSCREW A SETSCREW A SETSCREW B SETSCREW B SETSCREW A 040070686 q if...

Page 29: ...sition 4 Attach the buttohole foot R e 5 Lower the buttonhole lever r to its lowest position and open a 1 6 mm gap between the slider and the buttonhole foot 6 Turn the adjusting screw t to the left u...

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