Husqvarna Designer 1 Service Manual

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28. Disconnection when winding the lower thread
Check
When winding up the lower thread onto the bobbin the machine should stop
when there is a min. of 1 mm between the edge of the bobbin and the thread.
Adjustment
Turn by means of a screwdriver torx the disconnection (A) until the correct
amount of thread is obtained.
Settings 
						

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Base Plate
Dismounting
1. Dismount the upper and lower rear cover.
2. Dismount front cover.
4. Dismount the 2 screws (A) for the transformer.
3. Dismount the 3 screws (B).
Dismantling  and mounting 
						

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Transformer
Dismounting
1. Dismount upper rear cover.
2. Loosen the two screws (A) of the transformer from below in the base plate.
3. Push the transformer to the right so that the mains switch part is exposed from
   the base plate and lift it upwards.
4. Unhook the cable to the circuit boards from the transformer.
Checking the transformer
Connect the transformer to mains.
Measure the tension and resistence between the contact pins.
1 shall be approx. + 5 Volt   computer.
2 - 3 - Grounding
4 - 5 shall be approx. + 26 Volt   Step motor, drive motor.
6 - 7 shall be approx. 100-0 k Ohm Foot control connected
NOTE! The Transformer is a switched mode type power supply and can operate
 between 100-240 volt and 50-60 Hz.
Dismantling  and mounting 
						

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Circuit board - Circuit diagram
Dismounting
1. Dismount rear cover .
2. Dismount front cover .
3. Loosen the 3 screws (A) holding the circuit board and the cooling plates
   and lift out the board from the machine.
4. Loosen the cables from the circuit board according to below:
(1)  Right push buttons assembely (12) Feeding step motor
(2)  Left push button assembely (13)  Touch foil key board
(3)  Floppy disk drive (14) Embroidery Unit
(4)  LC Display (15) Conecting Sewing head board-ciruit board
(5)  LC display transformer box (16) Lamp - front cover
(6)  Stop right board (17)  Lamp  -  Sewing  head
(7) Thread cutter assembely (18) Step motor of the pressar foot lifter
(8)  Transformer (19) Stepmotor of the needle.
(9)  Motor. Red cable down (20) Sensor of the pressarfoot lifter
(10) Thread tension (21) Pressar foot sensor
(11) Side feedings step motor (22) Sewing head card
(23) Switch jumper. Note the position
Note!1.The contacts can be loosened by cautiously bending away the outer
covering with a thin screwdriver.
2. If the Main PC board is changed the memory always has to be updated
with the latest version.
Dismantling  and mounting 
						

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A
NOTE!  Check that the lower shaft sensor is mounted at a distance of approx. 1 mm from
the screen. ( see illustation.)
Stop right circuit board
Dismounting
1. Dismount rear cover .
2. Dismount front cover .
3. Disconnect the stop right board cable from the circuit board
3. Dismount the screw (A) thats holds the stop right circuit board.
4. Cautiously remove the circuit board from the support by bending its lower end
    outwards and thereafter pulling it downwards .
Dismantling  and mounting 
						

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Sewing head
Dismounting
1. Dismount rear covers and front cover.
2. Dismount the cable from the main circuit board to the sewing head connection board.
3. Loosen the screw (A)
4. Loosen screw (B) and remove the block (D) by pushing the screw (B) down.
5. Remove screw (C).
6. Unhook the sewing head from the sewing machine arm.
7. Unhook the sewing head from the stud (E) of the thread take-up
    lever and the connecting rod (F).
Mounting
1. Hook on the sewing head to the connecting rod (F) and the stud(E) of the thread take-up
lever.
2. Place sewing head in the machine.
3. Tighten the screw (C).
4. Mount the block (D) together with the screw (B) in the machine and tighten
Set thereafter:
8.  The gap between the needle and the hook
6.  The centre position of the needle.
7.  Setting of the needle in relation to the preesarfoot.
10. Needle height
19. Threading device.
22. Stitch length balance
Dismantling  and mounting 
						

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The step motor of the needle
Dismounting
1. Dismount rear covers .
2. Dismount front cover .
3. Dismount the step motor  by removing the 2 screws (A) .
4. Dismount  the step motor cable on the sewing head connection board.
Mounting
1.  Attach the cable to the sewing head connection board.
2.  Set the needle in its center position.
3.  Position the cogwheel (B) so that the screw (C) is pointing upwards.
4.  Mount the callibration stop (D). Note the position.
5.  Mount the step motor.
6.  Position the step motor and tighten the screws (A).
Set thereafter:
6. The centre position of the needle.
Dismantling  and mounting 
						

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The step motor of the presserfoot lifter
Dismounting
1. Dismount rear covers .
2. Dismount front cover .
3. Dismount the lamp of the sewing head by removing the screw (A)
4. Dismount the cable  from the sewing head connection board.
5. Dismount the step motor by removing the 2 screws (B) .
Mounting
1.  Attach the cable to the sewing head connection board.
2.  Mount the step motor. and tighten the screws (B).
3.  Mount the lamp of the sewing head.
Dismantling  and mounting 
						

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The thread tension compl.
Dismounting
1. Dismount rear covers.
2. Dismount the front cover.
3. Dismount the thread tension cover by taking a firm grip on the top of the cover
  and then carefully pulling it away from the front cover.
4. Dismount the push button board by disconnecting it from the cable .
5. Dismount the cable holder from the cable on the inside of the front cover.
6. Dismount the thread tension by removing the 2 screws (A) and (B).
    Note that the grounding cable is mounted on the screw (B)
7. Dismount the cogwheel (C) by removing the screw (D).
8. Dismount the step motor by removing the 2 screws (E).
 Mount in reverse order
Set thereafter
23. Lower thread tension.
24. Upper thread tension - Normal Position
25. Upper thread tension - Embroidery Position
27. Thread take-up spring.
26. Thread sensor guard.
Dismantling  and mounting 
						

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The  hook cover compl, step motor house.
Dismounting
1. Dismount the rear covers and the front cover .
2. Move the presser bar to its highest position.
3. Remove the needle.
4. Dismount the presser foot holder.
5. Dismount the bobbin window, the stitch plate, the bobbin basket holder and the bobbin
basket.
6. Snap away the thread cutter hatch by using a screwdriver at (A).
7. Dismount the 4 screws (B) on  the hook cover  and disconnect the step motor / lower
thread  indicator cable  from the main circuit board.
8. Dismount the hook cover by pulling it slightly backwards to the left.
Mount in reverse order
Set thereafter
13. Setting the stitchplate (hook cover )in relation to the needle in feeding direction.
14. The sideways setting of the stitchplate (hook cover ) in relation to the pressarfoot.
15. The height of the hook.
17. Setting the feeding mechanism sideways.
Dismantling  and mounting