HUSQVARNA 1200 User Manual

SERVICE MANUAL

SEWKNITWORLD

MODEL

1200, # 1

1100
1090
1070
1050

104 72 30-26 Husqvarna service manual 1

Contents

SEWKNITWORLD

Survey settings 4
User instructions 5

Gauges and service 6-7
Visual control of details 8-12
Electronics 13-22

Stich plate 8
Presser foot 8
Feed dog 8
Bobbin case 9
Hook cover 9
Hook 10
Driver 10
Main switch and feed dip button 10
Foot control 11
Cog belt, short 12
Cog belt, long 12
Wiring diagram 13
Service casette 14-17
Switch for presser foot lift 18
Buttonhole meter 18
Lower thread indicator 19
Stepmotors: Thread tension, sewing head, guide, side motion 20
Transformer 1050/1070/1090 21
Transformer 1100/1200 22
Electronic board 1050/1070/1090 21
Electronic board 1100/1200 22

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Setting instructions

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1 The hook gear 23
2 The gap between the hook cover and the driver 24
3 Presser foot, parallelism to the stitch plate 25
4 Setting the presser foot at right angles to the feeding direction 25
5 Setting of the step motor of the sewing head 26
6 Setting of the needle in relation to the presser foot 27
7 The gap between the hook and the needle 28
8 Setting the stitch plate in relation to the needle 29
9 Timing of the hook in relation to the needle 30
10 Needle height 31
11 Thread tension of the bobbin case 32
12 Upper thread tension 32
13 Setting the thread tension of the step motor 33
14 The setting of the thread take-up spring 33
15 Parallelism of the feed dog 34
16 The sideways setting of the feed dog 34
17 The feed dog height 34
18 The lengthwise movement of the feed dog 35
19 The bobbin-winding device 35
20 The balance of the stitch length 36-40
21 Pre-setting of the step motor of the guide 41
22 Pre-setting of the step motor of the side motion 42
23 The sideways setting of the feeding mechanism 43

Dismounting- and mounting instructions

Rear cover, lower cover 44
Front cover 44
Parts of the front cover 44
Parts of the front cover 1100/1200 program memory 45
Parts of the front cover 1100/1200 foil keyboard 46
Transformer 47
Main motor 48
Bobbin-stop 48
Circuit board 48
Foot control 49
Feeding guide compl 50
Connecting rod 51
Feeding mechanism unit with stitch regulator fork 51
Thread tension device compl 52
Driver 52
Lower shaft 53
Sewing head 54
Arm shaft 55
Side motion mechanism cpl 56
Fault finding diagram 57

104 72 30-26 Husqvarna service manual 3

SETTINGS

SEWKNITWORLD

4 Husqvarna service manual 104 72 30-26

Directions for use

SEWKNITWORLD

These service instructions are intended to be used by service workshop personnel, or by
salesmen who carry out servicing 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 controls the working order of the different parts.
The second section deals with the various settings which must be maintained to ensure that
the machine functions satisfactorily.
The third section covers dismantling and mounting instructions.
The fourth section contains a fault-finding diagram.
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.

wrist band position for wrist band

104 72 30-26 Husqvarna service manual 5

Setting gauges

SEWKNITWORLD

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 chiefly
intended as an indication as to how service men or service
workshops should be equipped.

The needle is often used as a setting gauge. The setting ratings
are adapted to needle size 90 and when setting in the feed direction,
the needle should be set in the middle of the needle hole. (Page.29).
Be sure to use an undamaged needle.

2. Gauge for setting the timing of the hook in relation to
the needle (P.30).Ref. No 411 17 52-01.

3. Gauge for the gap between the hook cover and driver.
(P.24). Ref. No 412 31 91-01.

4. Gauge for feed dog height (P.34).
Ref. No 411 49 93-01.

5. Weight for setting the thread tension of the
bobbin case (P.32).
Ref. No 412 15 83-01 (=22 g.)

6. I. Distance gauge (1,2mm) to set the step motor
of the sewing head (P.26).
II. Gauge for the centre position of the needle (P.26).
III. Distance gauge (0,6mm) for the pre-setting of the
step motor of the guide older version (P.41).
Ref. No compl. I-III. 412 27 60-01.

7. Electronic unit for testing the function of
the transformer and the stepmotors.
See separate instructions enclosed.
Ref. No 412 02 56-01.

8. Service casette for 1100, 1200 (P.14-15).
Ref. No 412 17 29-15.

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Service tools

SEWKNITWORLD

1. Fixed spanner 10mm to set the belt, long (P.12) and

the gap between the hook and the needle (P.28).
Ref. No 411 85 99-01

2. Fixed spanner 5mm to set the stitch plate in relation

to the needle (P.29).
Ref. No 411 85 98-01

3. Fixed spanner 5,5mm for the sidewards setting of the

feed dog (P.34).
Ref. No 411 54 31-01.

4. Adam keys:

-0.9mm for the timing of the step motor of the
thread tension (P.33).
Ref. No 412 27 71-01.

-1,5mm for needle clamp and step motors.
Ref. No 411 66 89-01.

-2,5mm for the timing of the hook in relation to the
needle (P.30) and for the gap between the hook
cover and the driver (P.24).
Ref. No 411 86 01-01.

5. Shortened adam key 2,5mm for the setting of the

presser foot (P.25) and of the needle in relation to
the presser foot (P.27).
Ref. No 412 27 65-01.

6. Key to set the stitch length balance (P.36-40).

Ref. No 412 27 66-01.

7. Magnetic screwdriver with two separate heads.

Ref. No 411 54 33-01.

8. Screwdriver Torx 10

Ref. No 412 36 48-01.
Screwdriver Torx 20
Ref. No 412 36 49-01.
Screwdriver Torx 25
Ref. No 412 36 50-01.

9. Angle key for Torx 6

Ref. No 412 27 67-01.

10.Wristband for ESD

Ref. No 412 23 02-01.

11.Extractor tool (p. 45).

Ref. No 412 27 98-01.

104 72 30-26 Husqvarna service manual 7

VISUAL CONTROL OF DETAILS

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Stitch plate

Requirements

The stitch plate must not be damaged in any way.
Particular attention should be paid to possible damage or
unevenness around the needle hole.

Action

Exchange the damaged stitch plate.

Mounting of a new stitch plate

In order to get the stitch plate into the correct position it
should be first mounted with the spring (A) and screws (B)
somewhat loose. Thereafter remove the stitch plate, fasten
the screws an remount the stitch plate.
Setting to needle, (P.29).

Presser foot

Requirements

There should be no scratches on the underneath of
the presser foot.

Action

Exchange a damaged presser foot.

Comments

How the fabric is held between the presserfoot and
the stitch plate plays an important role in the stitch
formation. Refer to all presser feet.
See Operating Manual.

Feed dog

Requirements

The top side of the feed dog must not be damaged
in any way, e.g. broken teeth etc.
It should be free from fluff and pieces of thread.
Compare with Operating Manual:
”Care of the machine”.

Action

The faulty dog should be exchanged.
Remove the stitch plate.
Undo the screws and replace the feed dog.
As regards to the settings of the feed dog (P.34-35).

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Bobbin case

SEWKNITWORLD

Requirements

The thread tension spring, in its whole width, must be
parallel to and press against the side of the bobbin case.

Action

Remove any fabric dressing which may have fastened
under the thread tension spring.
Damaged thread tension spring is to be exchanged.

Comments

Deposits from fabric or thread can fasten on the spindle
of the hook.
In that case the spindle should be carefully cleaned with
the brush in the accessory box.
At the same time make sure that pieces which may have
become wound around the spindle are removed.
Thread tension of the bobbin case, (P.32).

The hook cover

Requirements

The inside of the hook cover must not be damaged.

Action

Damaged hook cover must be exchanged.
Regarding the gap between the hook cover and the
driver , (P.24).

Comments

The inside of the hook cover forms a support for the
hook and the bridge above the finger of the bobbin
case supports the thread, so that the thread loop is
formed on the correct side of the needle.

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The hook

SEWKNITWORLD

Requirements

The tip of the hook (A) and surface (B) must not
be damaged.

Action

Exchange the damaged hook.

The driver

Requirements

The surface of the driver against the hook must not
be damaged, worn or uneven in any way which might
hinder the passage of the thread.

Action

Damaged hook is to be exchanged (P.52).

The main switch and feed dip button

If the main switch or the feed dip button doesn’t work
satisfactorily, remove the rear cover and front panel, (P.44).
Exchange the complete unit or spring (A).

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The foot control

SEWKNITWORLD

Requirements 1

The speed should be continuously controllable from the
lowest r/min to full speed.

Action

Test the foot control on a machine that is known to
operate properly. If it does not work, exchange the
whole control, alternatively the cord device or the
potentiometer.

Requirement 2

The cable should be easily extractable from the cord
device of the foot control and after pulling the cable
slightly it should be rewound on the cord device.

Action

The foot control or the cord device are to be exchanged.
Dismantling (P.49).

The foot control

Requirements

The speed should be continuously controllable from the
lowest r/min to full speed.

Action

Test the foot control on a machine that is known to
operate properly. If it does not work, exchange the
whole control, alternatively the potentiometer.
Dismounting (page 49).

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The cog belt, short

SEWKNITWORLD

Requirements

The belt tension should not be so loose that it permits
slipping when the machine is locked and the foot control
is depressed.
A tighter tension makes more noise.
The belt must not be damaged.

Adjustment

Undo both screws (A) underneath the base plate and
shift the motor until the required tension is obtained.

Comments

The motor is driven by direct current (DC) 24 V,
whereby the demands on insulation clearance are less
than by 220 V.

The cog belt, long

Requirements

The belt tension should not be so loose that it permits
slipping when the machine is locked and the foot control
is depressed.
A tighter tension makes more noise.
The belt must not be damaged.

Adjustment

Loosen the nut (A) by means of a 10mm fixed spanner
and shift the belt tension roller belt tension roller (B)
until the required tension is obtained.
Tighten the nut.

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ELECTRONICS

SEWKNITWORLD

Wiring Diagram

CONNECTING EXTERNAL UNITS TO DRIVEBOARD

1 THREAD TENSON MOT OR
2 PRESSER FOOT SWITCH
3 LAMP/LENGHT SENSOR
4 LAMP
5 MAIN MOTOR
6 NEEDLE MO TOR
7 LO W THREAD INDICAT OR
8 FEEDING MOTOR
9 SIDE MOTION MOTOR

BE SURE THAT CABLES TO DRIVE-BOARD ARE CORRECTLY

CONNECTED, BEFORE SWITCHING ON MAIN SUPPLY

MODEL 1050/1090 MODEL 1070

MODEL 1100/1200/#1

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Service casette, model 1100, 1200

SEWKNITWORLD

To facilitate the control and setting of the different functions of the machine there is a
service casette.
This is used together with the service mode of the machine.

Handling

-Insert the service casette into the casette terminal in the front cover .

-Get into the service mode of the machine by holding the back feeding button and (-)

stitch length pressed while turning on the main switch.

Service program, model 1050, 1070,1090

To facilitate the control and setting of the different functions of the machine there is a
service program.

Handling

-Get into the service program of the machine by holding the back feeding button and (-)

stitch length pressed while turning on the main switch.

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Functions on the service casette 1100, 1200

SEWKNITWORLD

Key 1 Shown in the right display.

Number of the program memory.
Which casettes the program memory contains.
Which casette is in the machine.
Check can be made that the machine reads the correct casette being inserted.
The letter of the casette has to be in accordance with the one shown on the display.

Key 2 Display test where all symbols light up on both displays.
Key 4 Check that the arm shaft sensor (stop right function) works.

The latter looks after when the step motors have to be reset,
it reads the speed and the stop right functions.
A square is shown in the right display.
If this square jumps around clockwise between 4 positions, 2 up and 2
down while ”slowly” pulling the machine around with the handwheel,
the function is correct.

Key 5 Is used when setting the step motor of the sewing head.

The step motors set themselves into the calibration position.
Setting no 5 (P.26).

Key 6 Is used when setting the step motor of the sewing head.

Setting no 5 (P.26).
The setting of the needle in relation to the presser foot.
Setting no 6 (P.27).

Key 7 Is used when setting the step motor of the thread tension.

Setting no 13 (P.33).
The step motor now takes its calibration position.

Key 8 Is used when checking the setting above.

The thread tension pulley shall set at 5.5 (=normal position).

Key 9 Is used when pre-setting the step motor of the guide. Setting no 21

(P.41). The step motor now takes its calibration position.

Key 11 Is used when setting the stitch length balance. Setting no 20 (P.39-40).

The feed dog shall stand still (0-feeding).

Key 12 Is used when setting the stitch length balance. Setting no 20 (P.39).
1100 The machine now sews a service buttonhole where both columns should have the

same length.

Key 12 Is used when setting the stitch length balance. Setting no 20 (P.40).
1200 The machine now sews stitch L-48 (rabbit) of the L-casette.
Key 13 Is used when setting the stitch length balance. Setting no 20 (P.39-40).

The machine sews the signs B,C,D,P,S,T,8.

Key 14 Is used when setting the stitch length balance. Setting no 20 (P.39-40).

The machine now sews stitch A38 which should have a rectangular
aspect.

NOTE! Not mentioned keys are not used at service or are without function.

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Functions of the service program 1070

SEWKNITWORLD

Key 1 Code letter of the program memory.
Key 2 Display test where all symbols light up on the display.
Key 4 Check that the arm shaft sensor (stop right function) works.

The latter looks after when the step motors have to be reset,
it reads the speed and the stop right functions.
The function is correct if numbers 1-4 are shown in the right part of
the display, while the handwheel is turned around slowly.

Key 5 Is used when setting the step motor of the sewing head.

The step motors set themselves into the calibration position.
Setting no 5 (P. 26).

Key 6 Is used when setting the step motor of the sewing head. Setting no 5

(P. 26). The setting of the needle in relation to the presser foot.
Setting no 6 (P. 27).

Key 7 Is used when pre-setting the step motor of the guide. Setting no 21

(P. 41). The step motor now takes its calibration position.

Key 37 Is used when setting the stitch length balance. Setting no 20 (P. 37.

The machine now sews the signs C, D, B, P, S, T, 8.

Key 40 Is used when setting the stitch length balance. Setting no 20 (P. 37.

The feed dog shall stand still (0-feeding).

Key 41 Is used when setting the stitch length balance. Setting no 20 (P. 37.

The machine now sews the stitch 41 which shall have a rectangular

look.

NOTE! Not mentioned keys are not used at service or are without
function.

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Functions of the service program 1050

SEWKNITWORLD

Key 1 Code letter of the program memory.
Key 2 Display test where all symbols light up on the display.

Key 4 Check that the arm shaft sensor (stop right function) works.The latter looks after when

the step motors have to be reset,it reads the speed and the stop right functions.
The function is correct if numbers 1-4 are shown in the right part of the display,
while the handwheel is turned around slowly.

Key 5 Is used when setting the step motor of the sewing head.

The step motors set themselves into the calibration position. Setting no 5 (P. 26).

Key 6 Is used when setting the step motor of the sewing head. Setting no 5 (P. 26).

The setting of the needle in relation to the presser foot. Setting no 6 (P. 27).

Key 7 Is used when pre-setting the step motor of the guide. Setting no 21(P. 41).

The step motor now takes its calibration position.

Menu D+ Is used when setting the stitch length balance. Setting no 20 (P. 36).
Key 6 The feed dog shall stand still (0-feeding).

Menu D+ Is used when setting the stitch length balance. Setting no 20 (P. 36).
Key 7 The machine now se ws the stitch D7 which shall have a rectangular look.

NOTE! Not mentioned keys are not used at service or are withoutfunction.

Functions of the service program 1090
Key 1 Code letter of the program memory.

Key 2 Display test where all symbols light up on the display.
Key 4 Check that the arm shaft sensor (stop right function) works.The latter looks after when

the step motors have to be reset,it reads the speed and the stop right functions.
The function is correct if numbers 1-4 are shown in the right part of the display, while
the handwheel is turned around slowly.

Key 5 Is used when setting the step motor of the sewing head.

The step motors set themselves into the calibration position. Setting no 5 (P. 26).

Key 6 Is used when setting the step motor of the sewing head. Setting no 5 (P. 26).

The setting of the needle in relation to the presser foot. Setting no 6 (P. 27).

Key 7 Is used when pre-setting the step motor of the guide. Setting no 21(P. 41).

The step motor now takes its calibration position.

Key 24 Is used when setting the stitch length balance. Setting no 20 (P. 38).

The machine sews the signs C, D, B, P, S, T, 8.

Key 38 Is used when setting the stitch length balance. Setting no 20 (P. 38).

The feed dog shall stand still (0-feeding).

Key 39 Is used when setting the stitch length balance. Setting no 20 (P. 38).

The machine now sews the stitch 39 which shall have a rectangularlook.

NOTE! Not mentioned keys are not used at service or are without function.

104 72 30-26 Husqvarna service manual 17

Switch for the presser foot lift

SEWKNITWORLD

In the sewing head there is a little switch that close when the presser foot is being lifted.
Then you cannot sew and a humming sound and flashing displays warns.
If there is anything wrong with the switch the machine can sew.
The function of the switch can be checked with a multi-range instrument at the lowest ­range by measuring between the two pins of the plug.
Lifted presser foot = 1 .
Lowered presser foot = 0 .
If the values are correct the fault is inside the circuit board or the connection between the
circuit board and the LCD board.
(Exceptionally the fault can also be inside the LCD board).

Buttonhole meter

Check the functions according to directions for use.
Inside the buttonhole meter there is a potentiometer that
is influenced by the measuring wheel (A).
The function of the buttonhole meter can be checked by
a multi-range instrument (-measuring).
When the measuring wheel (A) is turned a value
between 0.4 - 10 k is obtained.
If the values are correct the fault is inside the circuit
board or the connection between the circuit board and
the LCD board.
(Exceptionally the fault can also be inside the
LCD board).

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Lower thread indicator

SEWKNITWORLD

When the lower thread is almost at an end the machine gives a warning signal and a bobbin
flashes on the information display.
The lower thread indicator consists of an IR-diode that is reflected against a mirror on the
hub of the bobbin case, if the upper part of the bobbin is out of thread, and is received by a
photo transistor.
If the indicator does not work, it may be due to the indicator or the bobbin case being dirty
which makes it impossible for the IR-light to pass.
If the indicator still doesn’t work it should be replaced.
The fault may also be found on the circuit board, its connections or in some cases on the
LCD board.
You can check the indicator if you connect it to the circuit board (but don’t mount it) and
hold a mirror in front of it.

Photo transistor
(receiver)

IR-diode
(emitter)

Mirror

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