background image

9

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 preSSer foot lifter 

w

3.  looSen the SetScrew 

q

. raiSe the preSSer foot lifter and tighten the SetScrew 

q

  

 firmly.
  attach the needle and face plate.
note:
make SUre that the preSSer foot ShoUld be parallel to the feed dog SlotS 

e

 in the 

needle plate.

 q

 e

preSSer foot ShoUld 
be parallel to the feed 
dog SlotS.

 w

Содержание 8050

Страница 1: ...SERVICE MANUAL PARTS LIST 8050...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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