Pfaff hobby 1122 User manual

Service Manual
hobby
1122 - 1142

Contents
Foreword 3
Notes on the sewing machine with regard to ambient conditions,treatment,
cleaning and safety 4
Removing the housing covers 5
Face plate 5
Base cover 5
Front cover 6
Rear cover 7
Adjustment of the sideways movement of the needle in zigzag 8
Adjustment of the play in worm gear 9
Adjustment of the needle in center position 10
Adjustment of the hook to needle clearance 11
Adjustment of the timing of the hook in relation to the needle 12
Adjustment of the play in the hook gear 14
Adjustment of the needle bar height 15
Adjustment of the feed dog height 16
Adjustment of the presser bar height and alignment 17
Adjustmet of the bobbin thread tension 18
Adjustment of needle thread tension 19
Adjusting of the zero feed on the buttonholes bartack 20
Adjustment of buttonhole feed balance - The colums 21
Adjustment of the buttonhole length 22
Adjustment of equal stitch length for the forward/reverse-controlled
utility stitches - Stretch stitch balance (MODEL1142 and 1132) 23
Replacing and Adjusting Threader (MODEL1142) 24
Replacing Motor and Adjusting Motor Belt Tension 25
2 104 72 62-26

104 72 62-26 3
Foreword
The purpose of this service manual is to assist you in quick and correct repairing of the machines.
Adjustments should only be made if the settings deviate from the requirements described herein.
When checking or adjusting a machine, always proceed in the order of the worksteps prescribed.
For easier reference every workstep is marked with a dot.
When assembling dismantled machines, adjust the machine to approximately the right settings.
This facilitates the subsequent fine adjustments.
Unless otherwise specified, the handwheel must always be turned forward.
When carrying out maintenance work on live parts or in their proximity, the machine is to be separated
from the power supply by unplugging the lead cord from the electrical socket.
For the proper adjustment of the machine, the following gauges and tools are required:
Needle rise clamp 61-111 600-35/000
Spacer 63-102 600-18/000
Needle rise gauge 61-111 600-02/000
1,5 mm Allen key 07-433 005-28/000
2 mm Allen key 07-433 005-30/000
2.5 mm Allen key 07-433 005-40/000
Subject to alterations in design and dimensions.

4 104 72 62-26
Notes on the sewing machine with regard to ambient conditions,treatment, cleaning and
safety
Ambient conditions
The recommended ranges are:
Ambient temperature 10° to 40°C (50° to 104°F)
Air humidity 20 % to 80 %
Storage temperature -25°C to + 60°C (-13° to +140°F)
The machine is insensitive to interference according to the international laws; however, it should not be used in the
direct vicinity of electronic appliances such as radios, televisions, personal computers, radio transmitters etc.
This sewing machine is a high-quality electro-mechanical appliance; it is a machine for supervised use in the
home. It should be operated in such a way that it is not subjected to: dust, severe dampness, direct sunlight, static
electricity, heat-producing objects, corrosive chemicals or liquids.
To permit adequate ventilation the machine must be kept unblocked and used on a firm and even
surface.
Treatment
Always make sure not to damage your machine by knocking it over or dropping it.
Cleaning
Housing:
To clean the housing, use a dry, clean, soft, lint-free cloth. To remove any stubborn dirt, use a soft cloth with a
neutral cleansing agent for plastic materials.
Please Note!
Never use insecticides or chemical products such as petrol (gas) or thin chemicals to clean the housing.
Display:
If necessary, clean display with a soft cloth moistened with a little water.
Safety:
1. The machine should be put into operation as indicated on the specification plate.
2. Do not place any objects in openings on the machine.
3. Do not use the sewing machine if:
- there is visible damage,
- its function is defective,
- it is wet, e.g. with condensation.
4. Do not pull the lead cord out of the socket by its cord.
5. If this appliance is used for another purpose than that intended or if it is wrongly operated,
we cannot accept any liability for any damage caused.
6. To avoid the risk of electric shock, do not open the machine. There are no parts inside the machine
which the user can repair. This is the exclusive responsibility of our qualified service staff.
7. Be sure to use only original PFAFF parts.

A
A
A
A
A
A
C
B
B
A
C
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Face plate
Face cover:
1. Remove cap (A).
2. Unscrew screw (B) of the face cover.
3. Remove face cover (C) .
Removing the housing covers
1. Remove the six set screws (A)
2. Remove the base cover (B).
To attach
Shift the drop feed lever (C) in the direction of the arrow.
Attach the base cover with setscrews.
Base cover

(H)
(E)
(A)
(H)
(C)
(D)
(F)
(B)
Hook
6 104 72 62-26
1. Remove the face plate and base cover
Pull out the pattern selector dial (A) and stitch length dial (B).
Remove the setscrews (C), (D) and (E) (two off).
Remove the front cover (F), unlocking all the hooks (H).
To attach
Follow the above procedure in reverse.
Front cover

(B)
(B)
(C)
(A)
(D)
(E)
(1) (2)
(3)
104 72 62-26 7
Remove the face plate, base cover and front cover.
Remove the set screws (A), (B), (C) and (D).
Lower the presser foot lifter (E) and pull away the rear cover from the machine, clearing
the parts (1), (2) and (3), in this order.
To attach
Follow the above procedure in reverse.
Rear cover

(A)
(B)
(C)
2 - 3mm
8 104 72 62-26
Adjustment
• Remove the front cover
• Select the maximum width zigzag stitch ( ).
• Loosen the setscrews (A) on the worm (B).
• Holding the worm so it cant rotate, with an Allen key in one of the set screws (A).
• Turn the handwheel so that the needle starts its sideways movement 2-3 mm above the needle plate (C) in up-
ward travel as shown below.
• Tighten the setscrews (A) on the worm (B) securely.
Note! Make sure the worm does not move sideways when turning the handwheel, otherwise the play in the worm
gear will change.
• Attach the front cover.
Adjustment of the sideways movement of the needle in zigzag
Requirement:
For zigzag sewing the sideways movement of the needle must take place with the needle at a position higher
than the maximum fabric thickness.
Check
The needle must begin its sideways movement when its point is approx. 2-3 mm above the needle plate. It must
finish its sideways movement before it enters the fabric again

(E) (F)
(A)
(B)
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Adjustment of the play in worm gear
Requirement
It is impossible to obtain an equally large play in one rotation of the gear wheel (C) , but it should be as small as
possible at the tightest spot during the revolution.
Check
Rotate the gear wheel (C) back and forth and check the play. It should be zero or as small as possible.
Adjustment
• Remove the front cover
• Loosen the 2 setscrews (A) and move the worm :
- to increase the play, move the worm (D) to the direction of (E).
- to decrease the play, move the worm (D) to the direction of (F).
• Tighten the setscrews (A) on the worm (B) securely.
• Check that the setting “ Adjustment of the sideways movement of the needle in zigzag” hasn’t changed.
• Attach the front cover.

(B)
(A)
GH
(C)
10 104 72 62-26
Adjustment:
• Remove the face plate
• Select the straight stitch ( ), so the needle comes to it's centre position.
• Loosen the setscrew (B).
• Move the needle bar supporter so that the needle drops in the center of the needle hole. Tighten the setscrew.
• Select the maximum width zigzag stitch ( ) and check the clearance between needle and side edges of the
needle hole.
• Attach the face plate.
Adjustment of the needle in center position
Requirement:
When the machine is set for straight stitch position the needle must enter exactly in the center of the needle
hole.
At the for the widest zigzag stitch setting must be at the same distance from the left (G) and
right side (H) of the needle slot

# 90
(F) (A)
(B)
(E)
(C)
–1.0 to +0.05mm
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Requirement:
The standard clearance between the needle and hook point should be -0.10 to +0.05 mm.
Check
• Insert a new # 90 needle in the machine
• Select the maximum width zigzag stitch ( ).
• Remove the needle plate and bobbin holder.
• Rotate hand wheel until the point of the hook arrives behind the needle in the left position.
• Check the gap by pressing a small screw driver against the needle.
The gap should be between -0.1 and +0.05mm .
Adjustment
• Remove the needle plate and bobbin holder.
• Insert a new #90 needle.
• Select the maximum width zigzag stitch ( ). Rotate hand wheel until the point of the hook arrives behind the
needle in the left position
• Turn the machine to the back and remove the base cover.
• Loosen the screws (B) and (C).
•Loosen the screw (A), then tighten it slightly so that the hook can be moved.
• Move part (E) up or down to set the clearance between needle and the tip of hook (F) between -0.1 and +0.05mm
at the right and left sides.
• Tighten the 3 set screws (A) (B) and (C).
• Check the Play of the hook gear
• Attach the base cover, bobbin holder and needle plate.
Adjustment of the hook to needle clearance

(D)
(A)
(H)
(H)
(B)
(C)
12 104 72 62-26
Adjustment of the timing of the hook in relation to the needle
Requirement:
Set the machine on straight stitching. The needle (H) should travel 2,5 +-0,15 mm from its lowest position (D)
before the tip of the hook (A) exactly meets the right side of the needle.
Check
• Remove the needle plate (B) and bobbin holder (C).
• Select the straight stitch, so the needle comes to it's centre position.
Bring the needle bar to its lowest position.
• Place the needle rise clamp (61-111 600-35/000) over the needle bar and secure it lightely.
• Place a 2,5 mm feeler gauge (61-111 600-02/000) between the clamp and the needle bar frame.
• Loosen the clamp screw and push the needle risen clamp againt the feeler gauge and tighen the clamp screw.
Make sure its NO play between the feeler gauge, the clamp and the needle bar frame.
• Remove the feeler gauge
• Turn the hand wheel in sewing direction until needle bar frame is against the needle risen clamp.
• The tip of the hook (A) should now exactly meet the right side of the needle.
and the needle have risen 2,5 mm from the lowest needle position

(F)
(E)
(G)
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Adjustment
• Remove the stitch plate (B) and bobbin holder (C).
• Select the straight stitch, so the needle comes to it's centre position.
• Remove the base cover.
• Loosen the 2 hexagon set screws (E) on the lower shaft gear (F).
• Bring the needle bar to its lowest position.
Note! At this piont make sure the feed dog is in its down stroke position.
• Place the needle rise clamp (61-111 600-35/000) over the needle bar and secure it lightely.
• Place a 2,5 mm feeler gauge ((61-111 600-02/000) between the clamp and the needle bar frame.
• Loosen the clamp screw and push the needle risen clamp againt the feeler gauge and tighen the clamp screw.
Make sure its NO play between the feeler gauge, the clamp and the needle bar frame.
• Remove the feeler gauge
• Turn the hand wheel in sewing direction until needle risen clamp is against the needle bar frame.
and the needle have risen 2,5 mm from the lowest needle position
• Insert the allen key (G) into one of the hexagon socket screw (E) and turn the lower shaft gear (F) until the tip of
the rotary hook meets the right side of the needle (H).
• Tighten the 2 hexagon socket screws (E).
Attach the base cover, bobbin holder (C) and stitch plate (B).

(B)
(A)
(X)
(Y)
(C)
(D)
14 104 72 62-26
Adjustment of the play in the hook gear
Requirement
It’s impossible to obtain an equal large play in one rotation of the cogwheel, but it should be as small as possible
at the tightest spot during the revolution.
Check
• Remove the needle plate and bobbin holder.
• Turn the hand wheel in the sewing direction you until the tip of the hook (A) comes between both ends (B) of the
feed teeth
• Turn the hook back and forth and check the play
Adjustment
• Remove the needle plate and bobbin holder.
• Remove the base cover and loosen the hexagon setscrew (C).
• Turn the grooved part (D) of the lower shaft bushing (eccentric bushing) in the direction of
(X) If there is a tight spot.
(Y) when the play is too much.
• Tighten hexagon socket screw (C).
• Check the timing of hook and feed dog height.
• Attach the base cover, bobbin holder and stitch plate.

(A)
(D)
3,0 - 3.3 mm
(H)
(H)
(G)
(F)
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Adjustment of the needle bar height
Requirement
Set the machine on maximum zigzag width . When the needle from its lowest right hand position exactly meets
the tip of the hook the distance between the upper edge of the needle eye (H) and the ring of the hook (H) should
be 3,0 to 3,3 mm.
Check
• Remove the stitch plate and bobbin holder
• Set the machine on maximum zigzag width .
• Turn the hand wheel toward you until the tip of hook (D) exactly meets the right hand side of the needle at the
left needle drop position
• The distance between the upper edge of needle eye (H) and the ring of the hook (I) should now be
3,0 to 3,3 mm.
Adjustment
Note! Before performing this adjustment, check "Adjustment of the timing of the hook in relation
to the needle".
• Remove the face plate.
• Remove the needle plate and bobbin holder
• Set the machine on maximum zigzag width .
• Loosen the screw (A).
• Turn the hand wheel toward you until the tip of hook (D) exactly meets the right hand side of the needle at the
left needle drop position.
• Loosen the screw (E).
• Set the distance between the upper edge of needle eye (H) and the ring of the hook (I) to
3,0 to 3,3 mm by moving the needle bar (F).
• Tighten the screw of the needle bar connecting stud.The groove (G) should come to the front.
• Attach the bobbin holder and needle plate.

0.75 - 0.9 mm
(D)
(E)
(X)
(Y)
(C)
(B)
(A)
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Adjustment of the feed dog height
Check
When the feed dog is in it’s highest position. The Feed dog teath top (E) should be 0.75 to 0,9 mm from the
surface of the needle plate (D).
Adjustment
• Select the machines longest stitch lenghts setting
• Turn the hand wheel until the feed dog (D) comes to its highest position.
• Remove the base cover.
• Loosen the screw (A) and nut (B).
• Turn the adjusting screw (C) so that the feed dog height is between 0,75 mm to 0.9
mm from the surface of the needle plate (D).
- (X) To raise
- (Y) To lower
• Tighten the nut (B).
• Tighten the screw (A).
• Attach the base cover.

(D)
6mm
(A)
(B)
(F)
(G)
(C) (E)
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Adjustment of the presser bar height and alignment
Check
When the presser foot (A) is raised, the distance between the zigzag foot (A) and stitch plate (B) should be 6.0
mm.
Adjustment
• Remove the face cover.
• Raise the zigzag foot.
• Pass the allen key (C) through the hole (D) of the supporter.
• Loosen the hexagon socket screw (E).
• Adjust the distance between the zigzag foot (A) and stitch plate (B).
• Tighten the hexagon socket screw (E).
• Check if the pesser foot is paralleled with the feed dog (F) as shown below (G).
If not, loosen the hexagon socket screw (E), and adjust the direction.
• Attach the face cover.

A
18 104 72 62-26
Adjustmet of the bobbin thread tension
Check
• Insert a full bobbin into the bobbin basket.
• The thread tension spring of the bobbin basket shall give a resistance of 15 +- 2g when pulling the thread
slowly.
Adjustment
Turn screw (A) until the correct thread tension is obtained.
NOTE! Remove any loose pieces of thread or fluff from under the spring.

(B)
(A)
(E)
(C)
(C)
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Requirements:
A correct interlacing of the needle and bobbin thread tension must be obtained, when the thread tension dial is
set at "4", at straight stitching and zig-zag when sewing in cotton fabric with a polyester thread #50 (E).
Adjustment of needle thread tension
Check
• Set the thread tension dial at “4” and sew a zig-zag stich.
Adjustment
• Remove the face cover and Front cover
• Set the thread tension dial at “4”.
• Sew a zig-zag stich and turn the adjusting dial (C) in the direction of:
A if tension is too tight.
B if tension is too loose.
• Attach front cover and the face cover .

(H)
(H)
(E)
(G)
(G)
(B)
(A)
(J)
(D) (C)
20 104 72 62-26
Adjusting of the zero feed on the buttonholes bartack
Requirements
When a button hole's bartack is selected there should be no feeding.
Adjustment
• Sew a buttonhole to check if the fabric is fed while sewing the bartacks.
• Remove the cap (E).
If the fabric is fed foward (A), turn the adjusting screw in the direction (C).
If the fabric is fed backward (B), turn the adjusting screw in the direction (D).
• Attach the cap (E).
H = Bartack
J = Stitch length dial