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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 (6 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.

To disconnect, grasp the connector, not the cord.

Printed circuit board F

connector

Setscrew

Printed circuit board A

Setscrew

Printed circuit board L

connector

Содержание 3160QDCT

Страница 1: ...SERVICE MANUAL MODEL 3160QDC T First Edition 17 March 2023...

Страница 2: ...OF HOOK TIMING 10 ADJUSTMENT OF NEEDLE BAR HEIGHT 11 CLEARANCE BETWEEN NEEDLE AND TIP OF HOOK ROTARY 12 FEED DOG HEIGHT 13 FEED DOG ADJUSTMENT 14 TOP TENSION 15 REPLACING THE ELECTRONIC COMPONENTS CIR...

Страница 3: ...THE NEEDLE RETHREAD USE THE RECOMMENDED SEWING NEEDLE AND THREAD USE A HA X 11 BLUE TIP NEEDLE SEE MECHANICAL ADJUSTMENT ADJUSTMENT OF NEEDLE BAR HEIGHT SEE MECHANICAL ADJUSTMENT OF HOOK TIMING SEE ME...

Страница 4: ...BBIN 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...

Страница 5: ...BELT TENSION 4 NOT ENOUGH OIL 5 UPPER SHAFT GEAR IS LOOSE ELIMINATE THE BACKLASH ELIMINATE THE LOOSENESS SEE PART REMOVAL AND REPLACEMENT DRIVING MOTOR DC MOTOR OIL ALL MOVING PARTS ELIMINATE THE LOOS...

Страница 6: ...ANGING EXTERNAL PARTS FACE COVER TO REMOVE 1 Remove the setscrew A and lift the face cover to disengage the rib on the inside Remove the face cover B TO ATTACH 2 Follow the above procedures in reverse...

Страница 7: ...HANGING EXTERNAL PARTS FREE ARM COVER TO REMOVE 1 Remove the setscrew A 2 pcs Move the free arm cover B to the left and remove the free arm cover TO ATTACH 2 Follow the above procedures in reverse A A...

Страница 8: ...pcs and bed cover C 4 Remove the setscrews D 2 pcs 5 Loosen the setscrew E 6 Disengage the front cover and rear cover hooks 7 Disconnect all the connectors from the printed circuit board A NOTE Do not...

Страница 9: ...free arm cover see pages 4 and 5 2 Remove the setscrews A 2 pcs 3 Remove the setscrews B 2 pcs 4 Remove the setscrews C 2 pcs and bed cover 5 Remove the setscrews D 2 pcs and the rear cover TO ATTACH...

Страница 10: ...he feed dog below the needle plate Place a block 6 mm thick under the presser foot and lower the presser foot lifter A 3 Loosen the hexagonal socket screw B Raise the presser foot lifter and tighten t...

Страница 11: ...f the needle hole in the needle plate 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 Loosen the hexagonal socket screw...

Страница 12: ...tern left position Set the zigzag width at 0 6 Remove the free arm cover Turn the handwheel toward you to lower the needle at its lowest position 7 Loosen the hexagonal socket screw A 2 pcs 8 Move the...

Страница 13: ...4 2 Remove the setscrews 2 pcs on the needle plate 3 Remove the needle plate and the bobbin holder 4 Turn the power switch on 5 Select the pattern left position Set the zigzag width at 0 6 Turn the h...

Страница 14: ...aximum 5 Loosen the setscrew B 2 pcs 6 Turn the handwheel toward you Adjust the clearance between the needle and the tip of the rotary hook by moving the hook base plate up or down to within 0 10 to 0...

Страница 15: ...the setscrew A and nut B 5 Adjust the feed dog height by turning the adjusting screw C The highest position of the feed dog should be between 0 80 and 0 90 from the surface of the needle plate If the...

Страница 16: ...l socket screw 4x6 Insert the screw to the hole Tighten the hexagonal socket screw as far as it goes 2 Loosen the setscrew left screw 3 Turn hexagonal socket screw to adjust the feed dog should be par...

Страница 17: ...limit adjust as follows 1 Set the tension dial Auto 2 Remove the front cover see page 6 3 Lower the presser foot If the top tension is too tight turn the lead screw in the direction A If the top tens...

Страница 18: ...d r y u i o 0 1 Printed circuit board A Printed circuit board F Printed circuit board L q PRINTED CIRCUIT BOARD P w FEED MOTOR e THREAD CUTTER MOTOR r BOBBIN WINDING SWITCH t POWER SWITCH y ZIGZAG WID...

Страница 19: ...ectly 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 20: ...pushed buzzer sounds and LCD displays BH symbol BH symbol Bobbin symbol If the result is correct condition press the start stop button to proceed the next step If the result is defective condition pr...

Страница 21: ...ceed the next step Buzzer does not sound Stitch width or length symbol does not appear REMEDY Replace the printed circuit board A Replace the printed circuit board P 06 Upper shaft positioning sensor...

Страница 22: ...s SC 10 Buzzer does not sound REMEDY Replace the printed circuit board A The machine motor does not start The motor stops immediately The motor runs unstable REMEDY Replace the DC motor Replace the pr...

Страница 23: ...18 to 20 and fix the defective part The defective part number See pages 18 to 20 Steps and items section Turn the power switch off when the self diagnostic test is finished TO DISPLAY THE VERSION OF...

Страница 24: ...ircuit board A 3 Remove the setscrews 6 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 To disconnect gr...

Страница 25: ...Install the driving motor and the motor belt Tighten them with setscrews 2 pcs lightly 4 Move the motor up or down to adjust the motor belt tension The belt should deflect 7 to 9 mm when applying 300...

Страница 26: ...1 Remove the front cover and the rear cover see pages 6 to 7 2 Remove the setscrews A 3 pcs and the switching regulator 3 Remove the setscrews B 4 pcs TO ATTACH Follow the above procedures in reverse...

Страница 27: ...the buttonhole lever to its lowest position and open a 1 6 mm gap between the slider and the buttonhole foot 6 Turn the adjusting screw to the left until the LCD display BH symbol 7 Next turn the adj...

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