Pfaff ambition essential 1.0 User manual

24 July 2014
Service Manual
104 73 15-26
© 2014 SVP Worldwide - All Rights Reserved.
ambition
1.0
1.5
essential

2 104 73 15-26
Contents
IMPORTANT SAFETY INSTRUCTIONS......................................................................................................5
Directions for use..........................................................................................................................................6
ESD..............................................................................................................................................................6
Service tools.................................................................................................................................................7
Settings - Quick reference............................................................................................................................8
1. Belt tension - drive belt .......................................................................................................................11
2. Motor Belt tension...............................................................................................................................11
3. Upper shaft axial play .........................................................................................................................12
4. Take up lever ......................................................................................................................................12
5. Timing of the Feeding in relation to the needle ......................................................................................13
6. Setting the needle in centre position .................................................................................................14-15
7. Zigzag movement of the needle adjustment......................................................................................16-17
8. The timing of the hook in relation to the needle......................................................................................18
9. Play between Hook gear and lower shaft gear.......................................................................................19
10. The gap between the needle and the hook..........................................................................................20
11. Setting the needle plate in relation to the needle in the feeding direction. ...........................................21
12. Setting the bobbin stop to the bobbin...................................................................................................22
13. Setting the feed dog in relation to the needle plate.............................................................................23
14. Feed dog height..................................................................................................................................24
15. The needle bar height.........................................................................................................................25
16. Threading device ................................................................................................................................26
17. Presser foot height and parallelism to the needle plate......................................................................27
18. Height of presser bar’s guide piece......................................................................................................28
19. Setting the IDT excenter ......................................................................................................................29
20. Adjustment of the IDT foot - height ......................................................................................................30
21. Adjustment of the IDT foot - feeding position........................................................................................31
22. Setting IDT foot sideways.....................................................................................................................32
23. Lower thread tension (thread tension of the bobbin case)..................................................................33
24.Upper thread tension.............................................................................................................................34
25. Stitch length balance basic setting......................................................................................................35
26. Stitch length balance ...........................................................................................................................36
27. BH photo sensor position adjustment...................................................................................................37
28. Adjustment of bobbin winding.............................................................................................................38
29. Adjustment of bobbin winder stop.......................................................................................................38
Service program Ambition 1.0 and 1.5 ......................................................................................................39
Functions of the service menu 1 - Stepper motors.....................................................................................40
Functions of the service menu 2 - Display and Sensor..............................................................................41
Functions of the service menu - Test Patterns ...........................................................................................43
Functions of the service menu 6 - .............................................................................................................44
Functions of the service menu - Info / Test Patterns .................................................................................44
Functions of the service menu - Key Board Test........................................................................................45
Removing the covers..................................................................................................................................46
Base cover..................................................................................................................................................46
Base plate extension cover ........................................................................................................................46
Free arm cover...........................................................................................................................................46
Face plate...................................................................................................................................................46
Top cover....................................................................................................................................................46
Front cover .................................................................................................................................................48

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104 73 15-26
Main Circuit board - Circuit diagram Ambition 1.0 and1.5..........................................................................49
LCD Circuit board - Circuit diagram............................................................................................................50
Main Circuit board - Circuit diagram Ambition essential.............................................................................51
Power supply..............................................................................................................................................52
Fault finding Ambition 1.0 - 1.5...................................................................................................................53
No operation of the machine ......................................................................................................................53
No operation sewing machine....................................................................................................................53
LCD (Touch panel) no display ....................................................................................................................53
No operation/function of the pushbutton.....................................................................................................53
No operation DC motor...............................................................................................................................53
No operation Start/ Stop, Reverse/ Autolock, LED light .............................................................................53
Speed adjustment no operation..................................................................................................................54
No operation of the Zig-zag step motor......................................................................................................54
No operation of feed stepper motor............................................................................................................54
The bobbin winder spindle is in ”off” position, ............................................................................................54
No operation of BH.....................................................................................................................................54
No operation of Foot controller...................................................................................................................55
No function of LED lamp.............................................................................................................................55
Fault finding Ambition essential..................................................................................................................56
No operation of the machine ......................................................................................................................56
No operation sewing machine....................................................................................................................56
LCD no display...........................................................................................................................................56
No operation/function of the pushbutton.....................................................................................................56
No operation DC motor...............................................................................................................................57
No operation Needle position, reverse ......................................................................................................57
No operation of the Zig-zag step motor......................................................................................................58
No operation of feed stepper motor............................................................................................................58
The bobbin winder spindle is in ”off” position, ............................................................................................58
No operation of BH.....................................................................................................................................59
No operation of Foot controller...................................................................................................................59
No function of LED lamp.............................................................................................................................59

4 104 73 15-26
Please note that on disposal, this product must be
safely recycled in accordance with relevant
National legislation relating to
electrical/electronic products. If in doubt please
contact your retailer for guidance.
Veuillez noter qu’en cas de destruction, ce produit doit
bénéficier d’un recyclage sécurisé, conforme à la
législation nationale applicable aux produits
électriques/électroniques. En cas de doute, veuillez
contacter votre distributeur agréé.
Bitte beachten Sie, dass hinsichtlich der Entsor-
gung dieses Produkts, vorschriftsmäßig entspre-
chend der gültigen nationalen Gesetzgebung für
elektrische/elektronische Produkte, recycelt
werden muss.Bei Zweifel setzen Sie sich bitte mit
Ihrem Fachhändler in Verbindung.
• All casted parts within our products are marked with name of
material if allowed by size.
• All molded plastic parts within our products are marked with name
of material if allowed by size.

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104 73 15-26
This household sewing machine is designed to comply with IEC/EN 60335-2-28 and UL1594
IMPORTANT SAFETY INSTRUCTIONS
When using an electrical appliance, basic safety precautions should always be followed, including the
following:
Read all instructions before using this household Sewing machine.
DANGER – To reduce the risk of electric shock:
• A sewing machine should never be left unattended when plugged in. Always unplug this sewing
machine from the electric outlet immediately after using and before cleaning.
WARNING – To reduce the risk of burns, fire, electric
shock, or injury to person:
• Do not allow to be used as a toy. Close attention is necessary when this sewing machine is used by
or near children or infirm persons.
• Use this sewing machine only for its intended use as described in this manual. Use only attachments
recommended by the manufacturer as contained in this manual.
• Never operate this sewing machine if it has a damaged cord or plug, if it is not working properly, if
it has been dropped or damaged, or dropped into water. Return the sewing machine to the nearest
authorized dealer or service center for examination, repair, electrical or mechanical adjustment.
• Never operate the sewing machine with any air openings blocked. Keep ventilation openings of the
sewing machine and foot controller free from the accumulation of lint, dust, and loose cloth.
• Keep fingers away from all moving parts. Special care is required around the sewing machine
needle.
• Always use the proper needle plate. The wrong plate can cause the needle to break.
• Do not use bent needles.
• Do not pull or push fabric while stitching. It may deflect the needle causing it to break.
• Switch the sewing machine off (“0”) when making any adjustment in the needle area, such as
threading needle, changing needle, threading bobbin, or changing presser foot, etc.
• Always unplug sewing machine from the electrical outlet when removing covers, lubricating, or when
making any other user servicing adjustments mentioned in the instruction manual.
• Never drop or insert any object into any opening.
• Do not use outdoors.
• Do not operate where aerosol (spray) products are being used or where oxygen is being
administrated.
• To disconnect, turn all controls to the off (“0”) position, then remove plug from outlet.
• Do not unplug by pulling on cord. To unplug, grasp the plug, not the cord.
• Hold plug when rewinding into cord reel. Do not allow plug to whip when rewinding.
• This sewing machine is provided with double insulation. Use only identical replacement parts. See
instructions for Servicing of Double-Insulated Appliances.
SAVE THESE INSTRUCTIONS
SERVICING OF DOUBLE INSULATED PRODUCTS
In a double-insulated product, two systems of insulation are provided instead of grounding. No ground
means is provided on a double-insulated product, nor should a means for grounding be added to the
product. Servicing of a double-insulated product requires extreme care and knowledge of the system, and
should be done only by qualified service personnel. Replacement parts for a double-insulated product
must be identical to those parts in the product. A double-insulated product is marked with the words
‘DOUBLE INSULATION’ or ‘DOUBLE INSULATED’.

6 104 73 15-26
Directions for use
These service instructions are intended to be used by service workshop personnel, or by salesmen who
carry out servicing in their own districts. They assume a thorough knowledge of the handling of precision
appliances and accessibility to service tools.
The manual is divided into four sections and covers all service operations and checks which should be
carried out when making a complete overhaul of a sewing machine.
The first section deals with the various settings which must be maintained to ensure that the machine
functions satisfactorily. The second section covers the service program in the machine. The third section
covers dismantling and mounting of the covers. The fourth section covers dismantling and mounting
instructions.
The diagrams only give indication as to where the detail or mechanism is located in the machine. For
more detailed information regarding the construction, etc., refer to the diagrams in the spare parts list.
ESD
ATTENTION!
It is of the utmost importance that precautions are being taken in order to avoid damage of the electronics
by electro static discharges ESD (=Electro Static Discharge). To avoid that these errors arise it is
important to handle loose circuit boards in a controlled way.
Always use wrist band 412 23 02-01 when servicing.

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104 73 15-26
Service tools
A reasonable requirement in a domestic sewing machine is that it should able to sew all types of fabrics
used in the home. The settings made when assembling and sewing-in the machines are those most
suited to give the best results in the majority of fabrics and fabric combinations. In doing so, consideration
has been given to the requirements of different markets. This does, however, mean that when sewing
extreme fabrics, better results may be obtained in certain cases by altering the settings. It must be
pointed out that these altered settings can cause poorer results on more normal fabrics. How the different
standard ratings are set can be seen from the description under each setting instruction. The following list
of setting gauges and service tools is intended as an instruction about the special service tools needed to
servicing this machine.
1. On several different occasions the needle is used as a setting gauge.The setting ratings are adapted
to needle 90.Make sure to use an undamaged needle.
2. Gauge for setting the timing of the hook in relation to the needle.
Ref. No 63-102600-18/000 Spacer
Ref. No 61-111600-02/000 Feeler gauge 2.3
Ref. No 413 10 22 - 01 Needle clamp
3. Gauge for the feed dog lift.
Ref. No
63-112 120 08/000
4. Gauge for the needle height.
Ref. No 412 35 29-03
5. Allen key 2.5 mm
Ref. No 411 86 01-01
6. Allen key 2 mm
Ref. No 411 86 00-01
7. Allen key 1.5 mm
Ref. No 411 66 89-01
8. Allen key 4 mm
Ref. No 74-33006-27/000
8. Distance gauge 0.05-1.00 mm
Ref: No. 412 38 85-01

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10. The gap between the needle and the hook
The gap should be as small as possible, but max 0.15 mm - Straight stitch 2.5
mm.
11. Setting the needle plate (the hook cover) in relation to the needle in the feeding
direction.
The needle should, in the feeding direction, descend right into the middle of the
needle hole of the needle plate.
9. The play of the hook gear
It is impossible to obtain an equally large play in one rotation of the cog wheel,
but it should be as small as possible at the tightest spot during the revolution.
2. Belt tension, motor belt
Move the motor unit (b) util a correct belt tension is obtained.
Settings - Quick reference
1. Belt tension, drive belt
The belt tension shall be adjusted by re-position tensioning roller by push
it up or down until it is a firm belt tension.
Settings - Quick reference
6. Setting the needle in centre position
The needle should always get to the centre position, when the main switch is turned.
3 Upper shaft axial play
No lateral play between main shaft collar and bushing and main shaft should
rotates smoothly. Screws (a, b) used for adjustment.
8. The timing of the hook in relation to the needle
When the needle is in its centre position and the needle is
moving upwards, the tip of the hook should pass behind the
centre of the needle, when the needle is 2.3 mm above its lower
turning position.
4. Take up lever
When turning the hand wheel no noise should appear in the thread take up lever.
5. Timing of the Feeding in relation to the needle
When is in its needle lowest point.The feed lifting rock cam (a) and the screw (b)
of feed rock cam (c) should now be parallel.
7. Zigzag movement of the needle adjustment
On Zig-zag 4x7 mm and while urn the hand wheel to move the needle bar
upward. The vertical distance in which the needle point goes up until it swings
over to the right side should be 6.0~6.2mm.
1
3~4m/m
2
b
d
c
a
b
1
dc
a
b
1
a
b
1
1Needle plate
6.0-6.2mm
10.05~0.1 mm

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13. Setting the feed dog in relation to the needle plate
Sideways the feed dog should be symmetrically set in relation to the needle
plate slot.
14. Feed dog height
When Feed dog teeth are in its highest position they should be 0.9-1.05
mm above the needle plate.
15. The needle bar height
When the needle bar is in its lower turning position the distance between the upper
end of the needle and the surface (B) of the hook ring should be 28.55 (+ 0.2 mm).
16. Threading device
With a new # 70 needle the threader hook should go smoothly into the
needle eye.
17. Presser foot height and parallelism to the needle plate
When the presser foot is in its highest lifting position it shall be
approx. 7-7.2 mm above the needle plate.
The presser foot should be parallel to the feed dog.
Settings - Quick reference
12. Setting the bobbin stop to the bobbin.
18. Height of presser bar’s guide piece
The gap between presser bar and guide peice should be around 0.5 mm.
19. Setting the IDT excenter
Check position of feed cam marking (a) with marking on arm shaft and
screw.
21. Adjustment of the IDT foot - feeding position
The front edge of the IDT foot must be between the first and second
tooth of the centre row of the feed dog. 3
20. Adjustment of the IDT foot - height.
22. Setting IDT foot sideways
The front edge of the IDT foot must be in the middle of the
center feed dog.
3
Fig 2
D
D
Fig 1
1
ea
cd
f
g
0.9~1.05mm
28.55 mm
37~7.2 mm
1
0.5 mm
c
d
ge
3
5.6-5.8 mm

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25 and 26. Stitch length balance
The darning stitch shall look according to illustration.
Use Service mending stitch in menu 4 key.
23. Lower thread tension (thread tension of the bobbin case)
The thread tension spring of the bobbin case shall give a resistance of 10-14 g when
pulling the thread slowly, using normal polyester thread.
24. Upper thread tension
When the thread tension dial is set at 4 a correct take-up should be obtained at straight
stitching and zig-zag using normal cotton fabrics and polyester thread.
But It should be around 70-80 Gram , if the bobbin tension is set correctelly.
Settings - Quick reference
2a
27. BH photo sensor position adjustment
The BH lever crank (b) and the photo sensor’s (c) blocking movement should be
set in the middle.
2
b
c
28. Adjustment of bobbin winding
When winding up the lower thread onto the bobbin the machine should wind even.
29. Adjustment of bobbin winder stop
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.
0 mm
1 mm

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Settings
1. Belt tension - drive belt
Check
The flat-toothed belt must be set so that the sewing hook has no play in its rotating direction, but it must
be possible to turn the machine easily.
1. Press lightly against middle of flat-toothed belt.
2. The belt must move 3 to 4 mm.
Adjustment:
1. Remove the base plate
2. Loosen screws (A) and (B).
3. Re-position tensioning roller by push it up or down.
4. Tighten screws.
2. Motor Belt tension
Too tight or too loose motor belt tension can cause belt noise.
Too tight motor belt tension can make the machine to run slow and overload the motor.
Too loose motor belt tension may cause jumping of the belt teeth on the motor pulley.
Check
When pushing the motor belt with 200 grams load the deflection of the motor belt should be 4~6 mm.
Adjustment
1. Remove the base cover, face cover, front cover and back cover.
2. Loosen the screws (c, d) of adjusting plate (b).
3. Move the motor
- up, the belt will become loosen;
- down, it will become more tighter.
4. Tighten the set screw (c).
5. Attach the back cover, front cover, Base covers and the face cover.
1
4~6m/m
a
2
b
d
c
1
3~4m/m
2
a
b

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4. Take up lever
Check
When turning the hand wheel no noise should appear in the thread take up lever. If is too tight, it will be
difficult to turn the hand wheel. If is too loose, it will make noise while turning the hand wheel.
Adjustment
1. Remove face plate and top cover.
2. Loosen the screw (a).
3. Adjust thread take up lever(b) by pushing lever support to the right to remove excess play and tighten
the screw (a).
4. Turn handwheel in sewing direction to check for noise and movement.
5. If adjustment is too tight or too loose, proceed as per above step
3. Upper shaft axial play
Check
The axial play of the arm shaft should not be larger than 0.05 mm.
Adjustment
1. Remove the face plate and top cover.
2. Loosen 2 screws (a, b) on main shaft collar (c).
3. Pull hand wheel to the right.
4. Push main shaft collar (c) to the left against main shaft bushing (d), and tighten screws (a, b) .
5. Make sure there is no lateral play between main shaft collar and bushing.
6. Make sure main shaft rotates smoothly after adjustment. No hard spot or bind allowed.
7. If rotation of shaft is too tight, loosen screws (a, b) and proceed as per above step 3-4.
Settings
a
b
1
dc
a
b
1

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5. Timing of the Feeding in relation to the needle
Check
1. Remove all covers.
2. Turn the hand wheel so the needle comes to its lowest point.
3. The feed lifting rock cam (a) and the screw (b) of feed rock cam (c) should now be parallel.
Adjustment
1. Turn the hand wheel to make the needle comes to its lowest point.
2. Loosen the screw (b) of feed rock cam (c) adjust the screw position to move the eccentric until its
parallel with the feed lifting rock cam (a).
Settings
d
b
c
a

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6. Setting the needle in centre position
NOTE! ONLY FOR AMBITION 1.0- 1.5
Check 1
1. Insert a new needle size 90 universal in the machine.
2. The needle should always go its to the centre position, when the machine is turned on repeatedly.
Check 2 - using Service program
1. Go to the service program of the machine.
2. In Menu 1 Press Center needle pos.
- The needle should always go to its centre position in the #OApresser foot.
Check 3 - Basic position of Zigzag sensor
1. Go to the service program of the machine.
2. In Menu Press Needle left/Sensor Position
- The sensor wheel takes its setting position, the square should be black.
Adjustment - basic position of needle step motor
NOTE! To set the Basic position, the covers must be removed. The front cover should be used as a
service panel and should stand on the side of the machine and the cables between the cover and pc
board must be connected.
1. Go to the service program of the machine.
2. In Menu 1 Press Needle left/Sensor Position , step motor now goes to its electronic setting position
for the needle step motor.
3. Loosen the Hexagon 1.5 screw (E) in the cog wheel (D) on the step motor shaft.
4. Use the screw driver and turn the cog wheel until the square turns to black and stays black.
5. Tighten the Hexagon 1.5 screw (E).
6. Check the setting in Menu 1 by pressing Center needle pos. Then press Needle left/Sensor Position
again and the square should return to black.
7. If not re-do from point 3.
Adjustment - needle position on sewing head
1. Remove the face plate and the LED light at the sewing head.
2. Go to the service program of the machine.
3. In Menu1 - press Center needle pos.
4. Loosen screw (a) of needle bar driving rod pin (b). (1)
5. Adjust needle bar driving rod pin (b) position, clockwise
needle will turn left, counter clockwise needle will turn
right.
Settings
Needle point
1
ab

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104 73 15-26
Settings
6. Setting the needle in centre position
NOTE!ONLY FOR AMBITION ESSENTIAL
Check 1
1. Insert a new needle size 90 universal in the machine.
2. The needle should always go its to the centre position, when the machine is turned on repeatedly.
Adjustment - needle position
1. Press the ” “ button to ” “ mode on front cover.
2. Choose the pattern No 0 ” “.
3. Turn the handwheel until the needle is in the center of the needle hole.
4. Remove the face plate.
5. Loosen screw (a) of needle bar driving rod pin (b). (1)
6. Adjust needle bar position by turning screw (b) clockwise or counterclockwise to get proper setting. (1)
7. Make sure needle position is in center of needle plate hole. Tighten screw (a). (1, 2)
Needle point
1
ab

16 104 73 15-26
7. Zigzag movement of the needle adjustment
NOTE! ONLY FOR AMBITION 1.0- 1.5
Check
1. Go to service program , Menu 3 choose the No 4 Zig-zag 4x7 mm.
2. Set needle bar at its lowest point when it swings to left.
3. Turn the hand wheel to move the needle bar upward. The vertical distance in which the needle point
goes up until it swings over to the right side should be 6.0~6.2mm. (1)
Adjustment
1. Remove the face plate and top cover.
2. Go to the service program of the machine.
3. Go to Menu 3 choose the No 4 Zig-zag 4x7 mm.
4. Set needle bar at its lowest point when it swings to left.
5. Turn the hand wheel to move the needle bar upward. The vertical distance in which the needle point
goes up until it swings over to the right side should be 6.0~6.2mm. (1)
6. If needle flow is less than 6.0 mm, loosen the screw of rotary sensor collar (a), and turn rotary sensor
collar (b) toward back. (2)
If needle flow is more than 6.2 mm, turn rotary sensor collar (b) toward front. (2). Tighten the screw
(a) after making sure the needle flow is between 6.0 mm to 6.2 mm.
NOTE! Check that the rotary sensor collar (a) not is touching photo sensor’s (c).
Settings
1Needle plate
6.0-6.2mm
2
b
a
c

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7. Zigzag movement of the needle adjustment
NOTE!ONLY FOR AMBITION ESSENTIAL
Check
1. Press the ” “ button to ” “ mode on front cover.
2. Choose the pattern No 2 ” “ for zigzag stitch and width of 7 mm.
3. Set needle bar at its lowest point when it swings to left.
4. Turn the hand wheel to move the needle bar upward.
The vertical distance in which the needle point goes up until it swings over to the right side
should be .0~6.2mm. (1)
Adjustment
1. Remove the face plate and top cover.
2. Press the ” “ button to ” “ mode on front cover.
3. Choose the pattern No 2 ” “ for zigzag stitch and width of 7 mm.
4. Turn the hand wheel to move the needle bar upward. The vertical distance in which the needle point goes
up until it swings over to the right side should be 6.0~6.2mm. (1)
6. If needle flow is less than 6.0 mm,loosen the screw of rotary sensor collar (a), and turn rotary sensor collar
(b) toward back. (2)
If needle flow is more than 6.2 mm, turn rotary sensor collar (b) toward front. (2)
Tighten the screw (a) after making surethe needle flow is between 6.0 mm to 6.2 mm.
NOTE! Check that the rotary sensor collar (a) not is touching photo sensor’s (c).
Settings
1Needle plate
6.0-6.2mm
2
b
a
c

18 104 73 15-26
8. The timing of the hook in relation to the needle
Check
- Set a new needle size 90 universal into the machine.
- Remove the needle plate, bobbin case holder and the bobbin case.
- Set machine on straight stitching.
- As the needle is moving upwards, the tip of the hook should pass behind the centre of the needle,
when the needle is 2.3 mm above its lower turning position.
NOTE! Before any adjustment is done check that the setting "4. Setting the hook in relation to the feeding
eccentric" is correct.
Check with setting gauge,
Ref. No: 63-102600-18/000 Spacer,
Ref. No: 413 10 22-01 Needle clamp
Ref No: 61-111600-02/000 Feeler gauge 2.3 mm
1. Set the machine so the needle is in its centre position against the #OA presserfoot.
2. Turn the hand wheel until the needle is at its lower turning position.
3. Put the spacer onto the needle bar and push it upwards
against the needle bar frame (C).
4. Take then the timing clamp and put it on the needle bar
and tighten its screw lightly.
5. Take the 2.3 mm feeler gauge and put its cutout on the
needle bar, above the clamp.
6. Loosen the clamp a little and push both feeler gauge and
clamp upwards against the spacer.
7. Tighten the screw on the timing clamp.
8. Remove the 2.3 mm feeler gauge.
9. Turn the hand wheel, in the sewing direction, until the
timing clamp stops against the spacer (A).
10. The tip of the hook should now be behind the centre line
of the needle.
Adjustment
1. Loosen up Screws (e,f,g) on the lower shaft (d).
2. Make sure that the feed dog is in its down stroke position.
3. Repeat checking points 1 to 9 with the setting gauges.
4. Hold the arm shaft and turn the hook until its tip arrives
behind the centre line of the needle.
5. Hold the hook in position with the left hand and tighten one of the screws (e,f,g).
6. Check.
7. Tighten all the screws (e,f,g).
This adjustment will affect the setting: Play between hook gear and lower shaft gear.
Settings
A A
C
de
f
g
d

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Settings
9. Play between Hook gear and lower shaft gear
It is impossible to obtain an equally large play in one rotation of the cog wheel, but it should be as small
as possible at the tightest spot during the revolution.
Check
1. Move the cog wheel with the hand wheel and check play of the
gears at 4 positions – at each 90 degree angle.
2. At each position - rotate the hook back and forth with the finger tip
to check the play.
- a play should be found in all differant positions.
- a small play (max 0.5) should be found on one position.
Adjust
1. Remove free arm cover and needle plate.
2. Remove the bobbincase.
3. Loosen the three screws (b,c,d) on the lower shaft gear (A),
4. Move the lower shaft gear (A) right or left to change the axial play.
4. The maximum axial play of the hook should be within 0.5 mm in one position.
5. When a good play is obtained, tighten the three screws(b,c,d)
NOTE! This adjustment will affect the setting: Timing of needle and hook.
1
ab
A
2
ec
d
a

20 104 73 15-26
10. The gap between the needle and the hook
Check
1. Choose the pattern #1, straight stitch
2. Insert a new needle size 90 universal in the machine.
3. Remove the bobbin case.
4. Rotate hand wheel until the tip of the hook arrives behind the needle, see Ill
1
5. Check the gap by pressing a small screw driver against the needle.
The gap should be as small as possible, but max 0.1 mm.
Adjustment
If the gap is incorrect:
1. Loosen the screw (a). Use an Allen key 1.5mm.
2. Push the needle bar supporter (b).
- Backward, the space will become larger.
- Frontward, the space will become smaller.
3. Tighten the screw (a).
NOTE! This adjustment affects : Setting the needle plate in relation to the needle in the feeding direction.
Settings
2
b
a
10.05~0.1 mm