Transformer 1100/1200; Electronic Board 1100/1200; Electronics - Husqvarna 1200 Service Manual

1100, 1200
Transformer
The function of the transformer can be checked with gauge 412 02 56-01.
Electronics boards
The machine has 4 different boards and one foil keyboard. The transformer board is part of the
transformer compl.
Circuit board
The circuit board is on the front side in the arm and contains among other things:
-Components to stabilise the voltage,
-Main motor driving,
-Driving of the step motor of the sewing head,
-Driving of the step motor of the guide,
-Driving of the step motor of the thread tension,
-Driving of the step motor of the side motion, applies for model 1200,
-Arm shaft sensor,
-Buttonhole meter,
-Lower thread indicator
-Switch for the presser foot lifting,
-Light.
LCD board
The LCD board is in the front cover and contains among other things 2 LCD displays and the
driving for these, contacts (carbon pressure), for the keys beneath the scale, the computer, the
computer memories, and a warning buzzer.
The key functions are checked by means of the service casette.
Guide board
The guide board is in the front cover and contains among other things light emitting diodes
and contacts (carbon pressure) for the keys to the sewing guide.
Check by means of the service casette.
Foil keyboard
The foil keyboard is in the bottom of the casette terminal of the front cover and contains
keys from the casette and a sensor for the coding of the casette.
In the bottom of the casette terminal there is a code spring that presses on those by means of
the coding of the casette.
Check by means of the service casette.
Main motor
The main motor is a 24 volt permanent magnet motor that consumes 60 W at maximum speed.
If the main motor doesn't work when the foot control is pressed, try:
1) New foot control
2) New motor (only connect to circuit board at check)
3) New circuit board
4) New transformer
The angle of view of the LCD displays
To get a clear picture on the displays independent of how you sit or how tall you are you might
have to adjust the angle of view .
This is done by turning the little pulley in the edge of the casette terminal.
22 Husqvarna service manual 104 72 30-26
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